Initial Commit

dependencies/guzzlehttp/guzzle/src/BodySummarizer.php

@@ -0,0 +1,23 @@
+<?php
+
+namespace WP_Ultimo\Dependencies\GuzzleHttp;
+
+use WP_Ultimo\Dependencies\Psr\Http\Message\MessageInterface;
+final class BodySummarizer implements BodySummarizerInterface
+{
+    /**
+     * @var int|null
+     */
+    private $truncateAt;
+    public function __construct(int $truncateAt = null)
+    {
+        $this->truncateAt = $truncateAt;
+    }
+    /**
+     * Returns a summarized message body.
+     */
+    public function summarize(MessageInterface $message) : ?string
+    {
+        return $this->truncateAt === null ? \WP_Ultimo\Dependencies\GuzzleHttp\Psr7\Message::bodySummary($message) : \WP_Ultimo\Dependencies\GuzzleHttp\Psr7\Message::bodySummary($message, $this->truncateAt);
+    }
+}

dependencies/guzzlehttp/guzzle/src/BodySummarizerInterface.php

@@ -0,0 +1,12 @@
+<?php
+
+namespace WP_Ultimo\Dependencies\GuzzleHttp;
+
+use WP_Ultimo\Dependencies\Psr\Http\Message\MessageInterface;
+interface BodySummarizerInterface
+{
+    /**
+     * Returns a summarized message body.
+     */
+    public function summarize(MessageInterface $message) : ?string;
+}

dependencies/guzzlehttp/guzzle/src/Client.php

@@ -0,0 +1,402 @@
+<?php
+
+namespace WP_Ultimo\Dependencies\GuzzleHttp;
+
+use WP_Ultimo\Dependencies\GuzzleHttp\Cookie\CookieJar;
+use WP_Ultimo\Dependencies\GuzzleHttp\Exception\GuzzleException;
+use WP_Ultimo\Dependencies\GuzzleHttp\Exception\InvalidArgumentException;
+use WP_Ultimo\Dependencies\GuzzleHttp\Promise as P;
+use WP_Ultimo\Dependencies\GuzzleHttp\Promise\PromiseInterface;
+use WP_Ultimo\Dependencies\Psr\Http\Message\RequestInterface;
+use WP_Ultimo\Dependencies\Psr\Http\Message\ResponseInterface;
+use WP_Ultimo\Dependencies\Psr\Http\Message\UriInterface;
+/**
+ * @final
+ */
+class Client implements ClientInterface, \WP_Ultimo\Dependencies\Psr\Http\Client\ClientInterface
+{
+    use ClientTrait;
+    /**
+     * @var array Default request options
+     */
+    private $config;
+    /**
+     * Clients accept an array of constructor parameters.
+     *
+     * Here's an example of creating a client using a base_uri and an array of
+     * default request options to apply to each request:
+     *
+     *     $client = new Client([
+     *         'base_uri'        => 'http://www.foo.com/1.0/',
+     *         'timeout'         => 0,
+     *         'allow_redirects' => false,
+     *         'proxy'           => '192.168.16.1:10'
+     *     ]);
+     *
+     * Client configuration settings include the following options:
+     *
+     * - handler: (callable) Function that transfers HTTP requests over the
+     *   wire. The function is called with a Psr7\Http\Message\RequestInterface
+     *   and array of transfer options, and must return a
+     *   GuzzleHttp\Promise\PromiseInterface that is fulfilled with a
+     *   Psr7\Http\Message\ResponseInterface on success.
+     *   If no handler is provided, a default handler will be created
+     *   that enables all of the request options below by attaching all of the
+     *   default middleware to the handler.
+     * - base_uri: (string|UriInterface) Base URI of the client that is merged
+     *   into relative URIs. Can be a string or instance of UriInterface.
+     * - **: any request option
+     *
+     * @param array $config Client configuration settings.
+     *
+     * @see \GuzzleHttp\RequestOptions for a list of available request options.
+     */
+    public function __construct(array $config = [])
+    {
+        if (!isset($config['handler'])) {
+            $config['handler'] = HandlerStack::create();
+        } elseif (!\is_callable($config['handler'])) {
+            throw new InvalidArgumentException('handler must be a callable');
+        }
+        // Convert the base_uri to a UriInterface
+        if (isset($config['base_uri'])) {
+            $config['base_uri'] = Psr7\Utils::uriFor($config['base_uri']);
+        }
+        $this->configureDefaults($config);
+    }
+    /**
+     * @param string $method
+     * @param array  $args
+     *
+     * @return PromiseInterface|ResponseInterface
+     *
+     * @deprecated Client::__call will be removed in guzzlehttp/guzzle:8.0.
+     */
+    public function __call($method, $args)
+    {
+        if (\count($args) < 1) {
+            throw new InvalidArgumentException('Magic request methods require a URI and optional options array');
+        }
+        $uri = $args[0];
+        $opts = $args[1] ?? [];
+        return \substr($method, -5) === 'Async' ? $this->requestAsync(\substr($method, 0, -5), $uri, $opts) : $this->request($method, $uri, $opts);
+    }
+    /**
+     * Asynchronously send an HTTP request.
+     *
+     * @param array $options Request options to apply to the given
+     *                       request and to the transfer. See \GuzzleHttp\RequestOptions.
+     */
+    public function sendAsync(RequestInterface $request, array $options = []) : PromiseInterface
+    {
+        // Merge the base URI into the request URI if needed.
+        $options = $this->prepareDefaults($options);
+        return $this->transfer($request->withUri($this->buildUri($request->getUri(), $options), $request->hasHeader('Host')), $options);
+    }
+    /**
+     * Send an HTTP request.
+     *
+     * @param array $options Request options to apply to the given
+     *                       request and to the transfer. See \GuzzleHttp\RequestOptions.
+     *
+     * @throws GuzzleException
+     */
+    public function send(RequestInterface $request, array $options = []) : ResponseInterface
+    {
+        $options[RequestOptions::SYNCHRONOUS] = \true;
+        return $this->sendAsync($request, $options)->wait();
+    }
+    /**
+     * The HttpClient PSR (PSR-18) specify this method.
+     *
+     * {@inheritDoc}
+     */
+    public function sendRequest(RequestInterface $request) : ResponseInterface
+    {
+        $options[RequestOptions::SYNCHRONOUS] = \true;
+        $options[RequestOptions::ALLOW_REDIRECTS] = \false;
+        $options[RequestOptions::HTTP_ERRORS] = \false;
+        return $this->sendAsync($request, $options)->wait();
+    }
+    /**
+     * Create and send an asynchronous HTTP request.
+     *
+     * Use an absolute path to override the base path of the client, or a
+     * relative path to append to the base path of the client. The URL can
+     * contain the query string as well. Use an array to provide a URL
+     * template and additional variables to use in the URL template expansion.
+     *
+     * @param string              $method  HTTP method
+     * @param string|UriInterface $uri     URI object or string.
+     * @param array               $options Request options to apply. See \GuzzleHttp\RequestOptions.
+     */
+    public function requestAsync(string $method, $uri = '', array $options = []) : PromiseInterface
+    {
+        $options = $this->prepareDefaults($options);
+        // Remove request modifying parameter because it can be done up-front.
+        $headers = $options['headers'] ?? [];
+        $body = $options['body'] ?? null;
+        $version = $options['version'] ?? '1.1';
+        // Merge the URI into the base URI.
+        $uri = $this->buildUri(Psr7\Utils::uriFor($uri), $options);
+        if (\is_array($body)) {
+            throw $this->invalidBody();
+        }
+        $request = new Psr7\Request($method, $uri, $headers, $body, $version);
+        // Remove the option so that they are not doubly-applied.
+        unset($options['headers'], $options['body'], $options['version']);
+        return $this->transfer($request, $options);
+    }
+    /**
+     * Create and send an HTTP request.
+     *
+     * Use an absolute path to override the base path of the client, or a
+     * relative path to append to the base path of the client. The URL can
+     * contain the query string as well.
+     *
+     * @param string              $method  HTTP method.
+     * @param string|UriInterface $uri     URI object or string.
+     * @param array               $options Request options to apply. See \GuzzleHttp\RequestOptions.
+     *
+     * @throws GuzzleException
+     */
+    public function request(string $method, $uri = '', array $options = []) : ResponseInterface
+    {
+        $options[RequestOptions::SYNCHRONOUS] = \true;
+        return $this->requestAsync($method, $uri, $options)->wait();
+    }
+    /**
+     * Get a client configuration option.
+     *
+     * These options include default request options of the client, a "handler"
+     * (if utilized by the concrete client), and a "base_uri" if utilized by
+     * the concrete client.
+     *
+     * @param string|null $option The config option to retrieve.
+     *
+     * @return mixed
+     *
+     * @deprecated Client::getConfig will be removed in guzzlehttp/guzzle:8.0.
+     */
+    public function getConfig(string $option = null)
+    {
+        return $option === null ? $this->config : $this->config[$option] ?? null;
+    }
+    private function buildUri(UriInterface $uri, array $config) : UriInterface
+    {
+        if (isset($config['base_uri'])) {
+            $uri = Psr7\UriResolver::resolve(Psr7\Utils::uriFor($config['base_uri']), $uri);
+        }
+        if (isset($config['idn_conversion']) && $config['idn_conversion'] !== \false) {
+            $idnOptions = $config['idn_conversion'] === \true ? \IDNA_DEFAULT : $config['idn_conversion'];
+            $uri = Utils::idnUriConvert($uri, $idnOptions);
+        }
+        return $uri->getScheme() === '' && $uri->getHost() !== '' ? $uri->withScheme('http') : $uri;
+    }
+    /**
+     * Configures the default options for a client.
+     */
+    private function configureDefaults(array $config) : void
+    {
+        $defaults = ['allow_redirects' => RedirectMiddleware::$defaultSettings, 'http_errors' => \true, 'decode_content' => \true, 'verify' => \true, 'cookies' => \false, 'idn_conversion' => \false];
+        // Use the standard Linux HTTP_PROXY and HTTPS_PROXY if set.
+        // We can only trust the HTTP_PROXY environment variable in a CLI
+        // process due to the fact that PHP has no reliable mechanism to
+        // get environment variables that start with "HTTP_".
+        if (\PHP_SAPI === 'cli' && ($proxy = Utils::getenv('HTTP_PROXY'))) {
+            $defaults['proxy']['http'] = $proxy;
+        }
+        if ($proxy = Utils::getenv('HTTPS_PROXY')) {
+            $defaults['proxy']['https'] = $proxy;
+        }
+        if ($noProxy = Utils::getenv('NO_PROXY')) {
+            $cleanedNoProxy = \str_replace(' ', '', $noProxy);
+            $defaults['proxy']['no'] = \explode(',', $cleanedNoProxy);
+        }
+        $this->config = $config + $defaults;
+        if (!empty($config['cookies']) && $config['cookies'] === \true) {
+            $this->config['cookies'] = new CookieJar();
+        }
+        // Add the default user-agent header.
+        if (!isset($this->config['headers'])) {
+            $this->config['headers'] = ['User-Agent' => Utils::defaultUserAgent()];
+        } else {
+            // Add the User-Agent header if one was not already set.
+            foreach (\array_keys($this->config['headers']) as $name) {
+                if (\strtolower($name) === 'user-agent') {
+                    return;
+                }
+            }
+            $this->config['headers']['User-Agent'] = Utils::defaultUserAgent();
+        }
+    }
+    /**
+     * Merges default options into the array.
+     *
+     * @param array $options Options to modify by reference
+     */
+    private function prepareDefaults(array $options) : array
+    {
+        $defaults = $this->config;
+        if (!empty($defaults['headers'])) {
+            // Default headers are only added if they are not present.
+            $defaults['_conditional'] = $defaults['headers'];
+            unset($defaults['headers']);
+        }
+        // Special handling for headers is required as they are added as
+        // conditional headers and as headers passed to a request ctor.
+        if (\array_key_exists('headers', $options)) {
+            // Allows default headers to be unset.
+            if ($options['headers'] === null) {
+                $defaults['_conditional'] = [];
+                unset($options['headers']);
+            } elseif (!\is_array($options['headers'])) {
+                throw new InvalidArgumentException('headers must be an array');
+            }
+        }
+        // Shallow merge defaults underneath options.
+        $result = $options + $defaults;
+        // Remove null values.
+        foreach ($result as $k => $v) {
+            if ($v === null) {
+                unset($result[$k]);
+            }
+        }
+        return $result;
+    }
+    /**
+     * Transfers the given request and applies request options.
+     *
+     * The URI of the request is not modified and the request options are used
+     * as-is without merging in default options.
+     *
+     * @param array $options See \GuzzleHttp\RequestOptions.
+     */
+    private function transfer(RequestInterface $request, array $options) : PromiseInterface
+    {
+        $request = $this->applyOptions($request, $options);
+        /** @var HandlerStack $handler */
+        $handler = $options['handler'];
+        try {
+            return P\Create::promiseFor($handler($request, $options));
+        } catch (\Exception $e) {
+            return P\Create::rejectionFor($e);
+        }
+    }
+    /**
+     * Applies the array of request options to a request.
+     */
+    private function applyOptions(RequestInterface $request, array &$options) : RequestInterface
+    {
+        $modify = ['set_headers' => []];
+        if (isset($options['headers'])) {
+            if (\array_keys($options['headers']) === \range(0, \count($options['headers']) - 1)) {
+                throw new InvalidArgumentException('The headers array must have header name as keys.');
+            }
+            $modify['set_headers'] = $options['headers'];
+            unset($options['headers']);
+        }
+        if (isset($options['form_params'])) {
+            if (isset($options['multipart'])) {
+                throw new InvalidArgumentException('You cannot use ' . 'form_params and multipart at the same time. Use the ' . 'form_params option if you want to send application/' . 'x-www-form-urlencoded requests, and the multipart ' . 'option to send multipart/form-data requests.');
+            }
+            $options['body'] = \http_build_query($options['form_params'], '', '&');
+            unset($options['form_params']);
+            // Ensure that we don't have the header in different case and set the new value.
+            $options['_conditional'] = Psr7\Utils::caselessRemove(['Content-Type'], $options['_conditional']);
+            $options['_conditional']['Content-Type'] = 'application/x-www-form-urlencoded';
+        }
+        if (isset($options['multipart'])) {
+            $options['body'] = new Psr7\MultipartStream($options['multipart']);
+            unset($options['multipart']);
+        }
+        if (isset($options['json'])) {
+            $options['body'] = Utils::jsonEncode($options['json']);
+            unset($options['json']);
+            // Ensure that we don't have the header in different case and set the new value.
+            $options['_conditional'] = Psr7\Utils::caselessRemove(['Content-Type'], $options['_conditional']);
+            $options['_conditional']['Content-Type'] = 'application/json';
+        }
+        if (!empty($options['decode_content']) && $options['decode_content'] !== \true) {
+            // Ensure that we don't have the header in different case and set the new value.
+            $options['_conditional'] = Psr7\Utils::caselessRemove(['Accept-Encoding'], $options['_conditional']);
+            $modify['set_headers']['Accept-Encoding'] = $options['decode_content'];
+        }
+        if (isset($options['body'])) {
+            if (\is_array($options['body'])) {
+                throw $this->invalidBody();
+            }
+            $modify['body'] = Psr7\Utils::streamFor($options['body']);
+            unset($options['body']);
+        }
+        if (!empty($options['auth']) && \is_array($options['auth'])) {
+            $value = $options['auth'];
+            $type = isset($value[2]) ? \strtolower($value[2]) : 'basic';
+            switch ($type) {
+                case 'basic':
+                    // Ensure that we don't have the header in different case and set the new value.
+                    $modify['set_headers'] = Psr7\Utils::caselessRemove(['Authorization'], $modify['set_headers']);
+                    $modify['set_headers']['Authorization'] = 'Basic ' . \base64_encode("{$value[0]}:{$value[1]}");
+                    break;
+                case 'digest':
+                    // @todo: Do not rely on curl
+                    $options['curl'][\CURLOPT_HTTPAUTH] = \CURLAUTH_DIGEST;
+                    $options['curl'][\CURLOPT_USERPWD] = "{$value[0]}:{$value[1]}";
+                    break;
+                case 'ntlm':
+                    $options['curl'][\CURLOPT_HTTPAUTH] = \CURLAUTH_NTLM;
+                    $options['curl'][\CURLOPT_USERPWD] = "{$value[0]}:{$value[1]}";
+                    break;
+            }
+        }
+        if (isset($options['query'])) {
+            $value = $options['query'];
+            if (\is_array($value)) {
+                $value = \http_build_query($value, '', '&', \PHP_QUERY_RFC3986);
+            }
+            if (!\is_string($value)) {
+                throw new InvalidArgumentException('query must be a string or array');
+            }
+            $modify['query'] = $value;
+            unset($options['query']);
+        }
+        // Ensure that sink is not an invalid value.
+        if (isset($options['sink'])) {
+            // TODO: Add more sink validation?
+            if (\is_bool($options['sink'])) {
+                throw new InvalidArgumentException('sink must not be a boolean');
+            }
+        }
+        if (isset($options['version'])) {
+            $modify['version'] = $options['version'];
+        }
+        $request = Psr7\Utils::modifyRequest($request, $modify);
+        if ($request->getBody() instanceof Psr7\MultipartStream) {
+            // Use a multipart/form-data POST if a Content-Type is not set.
+            // Ensure that we don't have the header in different case and set the new value.
+            $options['_conditional'] = Psr7\Utils::caselessRemove(['Content-Type'], $options['_conditional']);
+            $options['_conditional']['Content-Type'] = 'multipart/form-data; boundary=' . $request->getBody()->getBoundary();
+        }
+        // Merge in conditional headers if they are not present.
+        if (isset($options['_conditional'])) {
+            // Build up the changes so it's in a single clone of the message.
+            $modify = [];
+            foreach ($options['_conditional'] as $k => $v) {
+                if (!$request->hasHeader($k)) {
+                    $modify['set_headers'][$k] = $v;
+                }
+            }
+            $request = Psr7\Utils::modifyRequest($request, $modify);
+            // Don't pass this internal value along to middleware/handlers.
+            unset($options['_conditional']);
+        }
+        return $request;
+    }
+    /**
+     * Return an InvalidArgumentException with pre-set message.
+     */
+    private function invalidBody() : InvalidArgumentException
+    {
+        return new InvalidArgumentException('Passing in the "body" request ' . 'option as an array to send a request is not supported. ' . 'Please use the "form_params" request option to send a ' . 'application/x-www-form-urlencoded request, or the "multipart" ' . 'request option to send a multipart/form-data request.');
+    }
+}

dependencies/guzzlehttp/guzzle/src/ClientInterface.php

@@ -0,0 +1,78 @@
+<?php
+
+namespace WP_Ultimo\Dependencies\GuzzleHttp;
+
+use WP_Ultimo\Dependencies\GuzzleHttp\Exception\GuzzleException;
+use WP_Ultimo\Dependencies\GuzzleHttp\Promise\PromiseInterface;
+use WP_Ultimo\Dependencies\Psr\Http\Message\RequestInterface;
+use WP_Ultimo\Dependencies\Psr\Http\Message\ResponseInterface;
+use WP_Ultimo\Dependencies\Psr\Http\Message\UriInterface;
+/**
+ * Client interface for sending HTTP requests.
+ */
+interface ClientInterface
+{
+    /**
+     * The Guzzle major version.
+     */
+    public const MAJOR_VERSION = 7;
+    /**
+     * Send an HTTP request.
+     *
+     * @param RequestInterface $request Request to send
+     * @param array            $options Request options to apply to the given
+     *                                  request and to the transfer.
+     *
+     * @throws GuzzleException
+     */
+    public function send(RequestInterface $request, array $options = []) : ResponseInterface;
+    /**
+     * Asynchronously send an HTTP request.
+     *
+     * @param RequestInterface $request Request to send
+     * @param array            $options Request options to apply to the given
+     *                                  request and to the transfer.
+     */
+    public function sendAsync(RequestInterface $request, array $options = []) : PromiseInterface;
+    /**
+     * Create and send an HTTP request.
+     *
+     * Use an absolute path to override the base path of the client, or a
+     * relative path to append to the base path of the client. The URL can
+     * contain the query string as well.
+     *
+     * @param string              $method  HTTP method.
+     * @param string|UriInterface $uri     URI object or string.
+     * @param array               $options Request options to apply.
+     *
+     * @throws GuzzleException
+     */
+    public function request(string $method, $uri, array $options = []) : ResponseInterface;
+    /**
+     * Create and send an asynchronous HTTP request.
+     *
+     * Use an absolute path to override the base path of the client, or a
+     * relative path to append to the base path of the client. The URL can
+     * contain the query string as well. Use an array to provide a URL
+     * template and additional variables to use in the URL template expansion.
+     *
+     * @param string              $method  HTTP method
+     * @param string|UriInterface $uri     URI object or string.
+     * @param array               $options Request options to apply.
+     */
+    public function requestAsync(string $method, $uri, array $options = []) : PromiseInterface;
+    /**
+     * Get a client configuration option.
+     *
+     * These options include default request options of the client, a "handler"
+     * (if utilized by the concrete client), and a "base_uri" if utilized by
+     * the concrete client.
+     *
+     * @param string|null $option The config option to retrieve.
+     *
+     * @return mixed
+     *
+     * @deprecated ClientInterface::getConfig will be removed in guzzlehttp/guzzle:8.0.
+     */
+    public function getConfig(string $option = null);
+}

dependencies/guzzlehttp/guzzle/src/ClientTrait.php

@@ -0,0 +1,227 @@
+<?php
+
+namespace WP_Ultimo\Dependencies\GuzzleHttp;
+
+use WP_Ultimo\Dependencies\GuzzleHttp\Exception\GuzzleException;
+use WP_Ultimo\Dependencies\GuzzleHttp\Promise\PromiseInterface;
+use WP_Ultimo\Dependencies\Psr\Http\Message\ResponseInterface;
+use WP_Ultimo\Dependencies\Psr\Http\Message\UriInterface;
+/**
+ * Client interface for sending HTTP requests.
+ */
+trait ClientTrait
+{
+    /**
+     * Create and send an HTTP request.
+     *
+     * Use an absolute path to override the base path of the client, or a
+     * relative path to append to the base path of the client. The URL can
+     * contain the query string as well.
+     *
+     * @param string              $method  HTTP method.
+     * @param string|UriInterface $uri     URI object or string.
+     * @param array               $options Request options to apply.
+     *
+     * @throws GuzzleException
+     */
+    public abstract function request(string $method, $uri, array $options = []) : ResponseInterface;
+    /**
+     * Create and send an HTTP GET request.
+     *
+     * Use an absolute path to override the base path of the client, or a
+     * relative path to append to the base path of the client. The URL can
+     * contain the query string as well.
+     *
+     * @param string|UriInterface $uri     URI object or string.
+     * @param array               $options Request options to apply.
+     *
+     * @throws GuzzleException
+     */
+    public function get($uri, array $options = []) : ResponseInterface
+    {
+        return $this->request('GET', $uri, $options);
+    }
+    /**
+     * Create and send an HTTP HEAD request.
+     *
+     * Use an absolute path to override the base path of the client, or a
+     * relative path to append to the base path of the client. The URL can
+     * contain the query string as well.
+     *
+     * @param string|UriInterface $uri     URI object or string.
+     * @param array               $options Request options to apply.
+     *
+     * @throws GuzzleException
+     */
+    public function head($uri, array $options = []) : ResponseInterface
+    {
+        return $this->request('HEAD', $uri, $options);
+    }
+    /**
+     * Create and send an HTTP PUT request.
+     *
+     * Use an absolute path to override the base path of the client, or a
+     * relative path to append to the base path of the client. The URL can
+     * contain the query string as well.
+     *
+     * @param string|UriInterface $uri     URI object or string.
+     * @param array               $options Request options to apply.
+     *
+     * @throws GuzzleException
+     */
+    public function put($uri, array $options = []) : ResponseInterface
+    {
+        return $this->request('PUT', $uri, $options);
+    }
+    /**
+     * Create and send an HTTP POST request.
+     *
+     * Use an absolute path to override the base path of the client, or a
+     * relative path to append to the base path of the client. The URL can
+     * contain the query string as well.
+     *
+     * @param string|UriInterface $uri     URI object or string.
+     * @param array               $options Request options to apply.
+     *
+     * @throws GuzzleException
+     */
+    public function post($uri, array $options = []) : ResponseInterface
+    {
+        return $this->request('POST', $uri, $options);
+    }
+    /**
+     * Create and send an HTTP PATCH request.
+     *
+     * Use an absolute path to override the base path of the client, or a
+     * relative path to append to the base path of the client. The URL can
+     * contain the query string as well.
+     *
+     * @param string|UriInterface $uri     URI object or string.
+     * @param array               $options Request options to apply.
+     *
+     * @throws GuzzleException
+     */
+    public function patch($uri, array $options = []) : ResponseInterface
+    {
+        return $this->request('PATCH', $uri, $options);
+    }
+    /**
+     * Create and send an HTTP DELETE request.
+     *
+     * Use an absolute path to override the base path of the client, or a
+     * relative path to append to the base path of the client. The URL can
+     * contain the query string as well.
+     *
+     * @param string|UriInterface $uri     URI object or string.
+     * @param array               $options Request options to apply.
+     *
+     * @throws GuzzleException
+     */
+    public function delete($uri, array $options = []) : ResponseInterface
+    {
+        return $this->request('DELETE', $uri, $options);
+    }
+    /**
+     * Create and send an asynchronous HTTP request.
+     *
+     * Use an absolute path to override the base path of the client, or a
+     * relative path to append to the base path of the client. The URL can
+     * contain the query string as well. Use an array to provide a URL
+     * template and additional variables to use in the URL template expansion.
+     *
+     * @param string              $method  HTTP method
+     * @param string|UriInterface $uri     URI object or string.
+     * @param array               $options Request options to apply.
+     */
+    public abstract function requestAsync(string $method, $uri, array $options = []) : PromiseInterface;
+    /**
+     * Create and send an asynchronous HTTP GET request.
+     *
+     * Use an absolute path to override the base path of the client, or a
+     * relative path to append to the base path of the client. The URL can
+     * contain the query string as well. Use an array to provide a URL
+     * template and additional variables to use in the URL template expansion.
+     *
+     * @param string|UriInterface $uri     URI object or string.
+     * @param array               $options Request options to apply.
+     */
+    public function getAsync($uri, array $options = []) : PromiseInterface
+    {
+        return $this->requestAsync('GET', $uri, $options);
+    }
+    /**
+     * Create and send an asynchronous HTTP HEAD request.
+     *
+     * Use an absolute path to override the base path of the client, or a
+     * relative path to append to the base path of the client. The URL can
+     * contain the query string as well. Use an array to provide a URL
+     * template and additional variables to use in the URL template expansion.
+     *
+     * @param string|UriInterface $uri     URI object or string.
+     * @param array               $options Request options to apply.
+     */
+    public function headAsync($uri, array $options = []) : PromiseInterface
+    {
+        return $this->requestAsync('HEAD', $uri, $options);
+    }
+    /**
+     * Create and send an asynchronous HTTP PUT request.
+     *
+     * Use an absolute path to override the base path of the client, or a
+     * relative path to append to the base path of the client. The URL can
+     * contain the query string as well. Use an array to provide a URL
+     * template and additional variables to use in the URL template expansion.
+     *
+     * @param string|UriInterface $uri     URI object or string.
+     * @param array               $options Request options to apply.
+     */
+    public function putAsync($uri, array $options = []) : PromiseInterface
+    {
+        return $this->requestAsync('PUT', $uri, $options);
+    }
+    /**
+     * Create and send an asynchronous HTTP POST request.
+     *
+     * Use an absolute path to override the base path of the client, or a
+     * relative path to append to the base path of the client. The URL can
+     * contain the query string as well. Use an array to provide a URL
+     * template and additional variables to use in the URL template expansion.
+     *
+     * @param string|UriInterface $uri     URI object or string.
+     * @param array               $options Request options to apply.
+     */
+    public function postAsync($uri, array $options = []) : PromiseInterface
+    {
+        return $this->requestAsync('POST', $uri, $options);
+    }
+    /**
+     * Create and send an asynchronous HTTP PATCH request.
+     *
+     * Use an absolute path to override the base path of the client, or a
+     * relative path to append to the base path of the client. The URL can
+     * contain the query string as well. Use an array to provide a URL
+     * template and additional variables to use in the URL template expansion.
+     *
+     * @param string|UriInterface $uri     URI object or string.
+     * @param array               $options Request options to apply.
+     */
+    public function patchAsync($uri, array $options = []) : PromiseInterface
+    {
+        return $this->requestAsync('PATCH', $uri, $options);
+    }
+    /**
+     * Create and send an asynchronous HTTP DELETE request.
+     *
+     * Use an absolute path to override the base path of the client, or a
+     * relative path to append to the base path of the client. The URL can
+     * contain the query string as well. Use an array to provide a URL
+     * template and additional variables to use in the URL template expansion.
+     *
+     * @param string|UriInterface $uri     URI object or string.
+     * @param array               $options Request options to apply.
+     */
+    public function deleteAsync($uri, array $options = []) : PromiseInterface
+    {
+        return $this->requestAsync('DELETE', $uri, $options);
+    }
+}

dependencies/guzzlehttp/guzzle/src/Cookie/CookieJar.php

@@ -0,0 +1,240 @@
+<?php
+
+namespace WP_Ultimo\Dependencies\GuzzleHttp\Cookie;
+
+use WP_Ultimo\Dependencies\Psr\Http\Message\RequestInterface;
+use WP_Ultimo\Dependencies\Psr\Http\Message\ResponseInterface;
+/**
+ * Cookie jar that stores cookies as an array
+ */
+class CookieJar implements CookieJarInterface
+{
+    /**
+     * @var SetCookie[] Loaded cookie data
+     */
+    private $cookies = [];
+    /**
+     * @var bool
+     */
+    private $strictMode;
+    /**
+     * @param bool  $strictMode  Set to true to throw exceptions when invalid
+     *                           cookies are added to the cookie jar.
+     * @param array $cookieArray Array of SetCookie objects or a hash of
+     *                           arrays that can be used with the SetCookie
+     *                           constructor
+     */
+    public function __construct(bool $strictMode = \false, array $cookieArray = [])
+    {
+        $this->strictMode = $strictMode;
+        foreach ($cookieArray as $cookie) {
+            if (!$cookie instanceof SetCookie) {
+                $cookie = new SetCookie($cookie);
+            }
+            $this->setCookie($cookie);
+        }
+    }
+    /**
+     * Create a new Cookie jar from an associative array and domain.
+     *
+     * @param array  $cookies Cookies to create the jar from
+     * @param string $domain  Domain to set the cookies to
+     */
+    public static function fromArray(array $cookies, string $domain) : self
+    {
+        $cookieJar = new self();
+        foreach ($cookies as $name => $value) {
+            $cookieJar->setCookie(new SetCookie(['Domain' => $domain, 'Name' => $name, 'Value' => $value, 'Discard' => \true]));
+        }
+        return $cookieJar;
+    }
+    /**
+     * Evaluate if this cookie should be persisted to storage
+     * that survives between requests.
+     *
+     * @param SetCookie $cookie              Being evaluated.
+     * @param bool      $allowSessionCookies If we should persist session cookies
+     */
+    public static function shouldPersist(SetCookie $cookie, bool $allowSessionCookies = \false) : bool
+    {
+        if ($cookie->getExpires() || $allowSessionCookies) {
+            if (!$cookie->getDiscard()) {
+                return \true;
+            }
+        }
+        return \false;
+    }
+    /**
+     * Finds and returns the cookie based on the name
+     *
+     * @param string $name cookie name to search for
+     *
+     * @return SetCookie|null cookie that was found or null if not found
+     */
+    public function getCookieByName(string $name) : ?SetCookie
+    {
+        foreach ($this->cookies as $cookie) {
+            if ($cookie->getName() !== null && \strcasecmp($cookie->getName(), $name) === 0) {
+                return $cookie;
+            }
+        }
+        return null;
+    }
+    public function toArray() : array
+    {
+        return \array_map(static function (SetCookie $cookie) : array {
+            return $cookie->toArray();
+        }, $this->getIterator()->getArrayCopy());
+    }
+    public function clear(string $domain = null, string $path = null, string $name = null) : void
+    {
+        if (!$domain) {
+            $this->cookies = [];
+            return;
+        } elseif (!$path) {
+            $this->cookies = \array_filter($this->cookies, static function (SetCookie $cookie) use($domain) : bool {
+                return !$cookie->matchesDomain($domain);
+            });
+        } elseif (!$name) {
+            $this->cookies = \array_filter($this->cookies, static function (SetCookie $cookie) use($path, $domain) : bool {
+                return !($cookie->matchesPath($path) && $cookie->matchesDomain($domain));
+            });
+        } else {
+            $this->cookies = \array_filter($this->cookies, static function (SetCookie $cookie) use($path, $domain, $name) {
+                return !($cookie->getName() == $name && $cookie->matchesPath($path) && $cookie->matchesDomain($domain));
+            });
+        }
+    }
+    public function clearSessionCookies() : void
+    {
+        $this->cookies = \array_filter($this->cookies, static function (SetCookie $cookie) : bool {
+            return !$cookie->getDiscard() && $cookie->getExpires();
+        });
+    }
+    public function setCookie(SetCookie $cookie) : bool
+    {
+        // If the name string is empty (but not 0), ignore the set-cookie
+        // string entirely.
+        $name = $cookie->getName();
+        if (!$name && $name !== '0') {
+            return \false;
+        }
+        // Only allow cookies with set and valid domain, name, value
+        $result = $cookie->validate();
+        if ($result !== \true) {
+            if ($this->strictMode) {
+                throw new \RuntimeException('Invalid cookie: ' . $result);
+            }
+            $this->removeCookieIfEmpty($cookie);
+            return \false;
+        }
+        // Resolve conflicts with previously set cookies
+        foreach ($this->cookies as $i => $c) {
+            // Two cookies are identical, when their path, and domain are
+            // identical.
+            if ($c->getPath() != $cookie->getPath() || $c->getDomain() != $cookie->getDomain() || $c->getName() != $cookie->getName()) {
+                continue;
+            }
+            // The previously set cookie is a discard cookie and this one is
+            // not so allow the new cookie to be set
+            if (!$cookie->getDiscard() && $c->getDiscard()) {
+                unset($this->cookies[$i]);
+                continue;
+            }
+            // If the new cookie's expiration is further into the future, then
+            // replace the old cookie
+            if ($cookie->getExpires() > $c->getExpires()) {
+                unset($this->cookies[$i]);
+                continue;
+            }
+            // If the value has changed, we better change it
+            if ($cookie->getValue() !== $c->getValue()) {
+                unset($this->cookies[$i]);
+                continue;
+            }
+            // The cookie exists, so no need to continue
+            return \false;
+        }
+        $this->cookies[] = $cookie;
+        return \true;
+    }
+    public function count() : int
+    {
+        return \count($this->cookies);
+    }
+    /**
+     * @return \ArrayIterator<int, SetCookie>
+     */
+    public function getIterator() : \ArrayIterator
+    {
+        return new \ArrayIterator(\array_values($this->cookies));
+    }
+    public function extractCookies(RequestInterface $request, ResponseInterface $response) : void
+    {
+        if ($cookieHeader = $response->getHeader('Set-Cookie')) {
+            foreach ($cookieHeader as $cookie) {
+                $sc = SetCookie::fromString($cookie);
+                if (!$sc->getDomain()) {
+                    $sc->setDomain($request->getUri()->getHost());
+                }
+                if (0 !== \strpos($sc->getPath(), '/')) {
+                    $sc->setPath($this->getCookiePathFromRequest($request));
+                }
+                if (!$sc->matchesDomain($request->getUri()->getHost())) {
+                    continue;
+                }
+                // Note: At this point `$sc->getDomain()` being a public suffix should
+                // be rejected, but we don't want to pull in the full PSL dependency.
+                $this->setCookie($sc);
+            }
+        }
+    }
+    /**
+     * Computes cookie path following RFC 6265 section 5.1.4
+     *
+     * @see https://tools.ietf.org/html/rfc6265#section-5.1.4
+     */
+    private function getCookiePathFromRequest(RequestInterface $request) : string
+    {
+        $uriPath = $request->getUri()->getPath();
+        if ('' === $uriPath) {
+            return '/';
+        }
+        if (0 !== \strpos($uriPath, '/')) {
+            return '/';
+        }
+        if ('/' === $uriPath) {
+            return '/';
+        }
+        $lastSlashPos = \strrpos($uriPath, '/');
+        if (0 === $lastSlashPos || \false === $lastSlashPos) {
+            return '/';
+        }
+        return \substr($uriPath, 0, $lastSlashPos);
+    }
+    public function withCookieHeader(RequestInterface $request) : RequestInterface
+    {
+        $values = [];
+        $uri = $request->getUri();
+        $scheme = $uri->getScheme();
+        $host = $uri->getHost();
+        $path = $uri->getPath() ?: '/';
+        foreach ($this->cookies as $cookie) {
+            if ($cookie->matchesPath($path) && $cookie->matchesDomain($host) && !$cookie->isExpired() && (!$cookie->getSecure() || $scheme === 'https')) {
+                $values[] = $cookie->getName() . '=' . $cookie->getValue();
+            }
+        }
+        return $values ? $request->withHeader('Cookie', \implode('; ', $values)) : $request;
+    }
+    /**
+     * If a cookie already exists and the server asks to set it again with a
+     * null value, the cookie must be deleted.
+     */
+    private function removeCookieIfEmpty(SetCookie $cookie) : void
+    {
+        $cookieValue = $cookie->getValue();
+        if ($cookieValue === null || $cookieValue === '') {
+            $this->clear($cookie->getDomain(), $cookie->getPath(), $cookie->getName());
+        }
+    }
+}

dependencies/guzzlehttp/guzzle/src/Cookie/CookieJarInterface.php

@@ -0,0 +1,74 @@
+<?php
+
+namespace WP_Ultimo\Dependencies\GuzzleHttp\Cookie;
+
+use WP_Ultimo\Dependencies\Psr\Http\Message\RequestInterface;
+use WP_Ultimo\Dependencies\Psr\Http\Message\ResponseInterface;
+/**
+ * Stores HTTP cookies.
+ *
+ * It extracts cookies from HTTP requests, and returns them in HTTP responses.
+ * CookieJarInterface instances automatically expire contained cookies when
+ * necessary. Subclasses are also responsible for storing and retrieving
+ * cookies from a file, database, etc.
+ *
+ * @see https://docs.python.org/2/library/cookielib.html Inspiration
+ *
+ * @extends \IteratorAggregate<SetCookie>
+ */
+interface CookieJarInterface extends \Countable, \IteratorAggregate
+{
+    /**
+     * Create a request with added cookie headers.
+     *
+     * If no matching cookies are found in the cookie jar, then no Cookie
+     * header is added to the request and the same request is returned.
+     *
+     * @param RequestInterface $request Request object to modify.
+     *
+     * @return RequestInterface returns the modified request.
+     */
+    public function withCookieHeader(RequestInterface $request) : RequestInterface;
+    /**
+     * Extract cookies from an HTTP response and store them in the CookieJar.
+     *
+     * @param RequestInterface  $request  Request that was sent
+     * @param ResponseInterface $response Response that was received
+     */
+    public function extractCookies(RequestInterface $request, ResponseInterface $response) : void;
+    /**
+     * Sets a cookie in the cookie jar.
+     *
+     * @param SetCookie $cookie Cookie to set.
+     *
+     * @return bool Returns true on success or false on failure
+     */
+    public function setCookie(SetCookie $cookie) : bool;
+    /**
+     * Remove cookies currently held in the cookie jar.
+     *
+     * Invoking this method without arguments will empty the whole cookie jar.
+     * If given a $domain argument only cookies belonging to that domain will
+     * be removed. If given a $domain and $path argument, cookies belonging to
+     * the specified path within that domain are removed. If given all three
+     * arguments, then the cookie with the specified name, path and domain is
+     * removed.
+     *
+     * @param string|null $domain Clears cookies matching a domain
+     * @param string|null $path   Clears cookies matching a domain and path
+     * @param string|null $name   Clears cookies matching a domain, path, and name
+     */
+    public function clear(string $domain = null, string $path = null, string $name = null) : void;
+    /**
+     * Discard all sessions cookies.
+     *
+     * Removes cookies that don't have an expire field or a have a discard
+     * field set to true. To be called when the user agent shuts down according
+     * to RFC 2965.
+     */
+    public function clearSessionCookies() : void;
+    /**
+     * Converts the cookie jar to an array.
+     */
+    public function toArray() : array;
+}

dependencies/guzzlehttp/guzzle/src/Cookie/FileCookieJar.php

@@ -0,0 +1,92 @@
+<?php
+
+namespace WP_Ultimo\Dependencies\GuzzleHttp\Cookie;
+
+use WP_Ultimo\Dependencies\GuzzleHttp\Utils;
+/**
+ * Persists non-session cookies using a JSON formatted file
+ */
+class FileCookieJar extends CookieJar
+{
+    /**
+     * @var string filename
+     */
+    private $filename;
+    /**
+     * @var bool Control whether to persist session cookies or not.
+     */
+    private $storeSessionCookies;
+    /**
+     * Create a new FileCookieJar object
+     *
+     * @param string $cookieFile          File to store the cookie data
+     * @param bool   $storeSessionCookies Set to true to store session cookies
+     *                                    in the cookie jar.
+     *
+     * @throws \RuntimeException if the file cannot be found or created
+     */
+    public function __construct(string $cookieFile, bool $storeSessionCookies = \false)
+    {
+        parent::__construct();
+        $this->filename = $cookieFile;
+        $this->storeSessionCookies = $storeSessionCookies;
+        if (\file_exists($cookieFile)) {
+            $this->load($cookieFile);
+        }
+    }
+    /**
+     * Saves the file when shutting down
+     */
+    public function __destruct()
+    {
+        $this->save($this->filename);
+    }
+    /**
+     * Saves the cookies to a file.
+     *
+     * @param string $filename File to save
+     *
+     * @throws \RuntimeException if the file cannot be found or created
+     */
+    public function save(string $filename) : void
+    {
+        $json = [];
+        /** @var SetCookie $cookie */
+        foreach ($this as $cookie) {
+            if (CookieJar::shouldPersist($cookie, $this->storeSessionCookies)) {
+                $json[] = $cookie->toArray();
+            }
+        }
+        $jsonStr = Utils::jsonEncode($json);
+        if (\false === \file_put_contents($filename, $jsonStr, \LOCK_EX)) {
+            throw new \RuntimeException("Unable to save file {$filename}");
+        }
+    }
+    /**
+     * Load cookies from a JSON formatted file.
+     *
+     * Old cookies are kept unless overwritten by newly loaded ones.
+     *
+     * @param string $filename Cookie file to load.
+     *
+     * @throws \RuntimeException if the file cannot be loaded.
+     */
+    public function load(string $filename) : void
+    {
+        $json = \file_get_contents($filename);
+        if (\false === $json) {
+            throw new \RuntimeException("Unable to load file {$filename}");
+        }
+        if ($json === '') {
+            return;
+        }
+        $data = Utils::jsonDecode($json, \true);
+        if (\is_array($data)) {
+            foreach ($data as $cookie) {
+                $this->setCookie(new SetCookie($cookie));
+            }
+        } elseif (\is_scalar($data) && !empty($data)) {
+            throw new \RuntimeException("Invalid cookie file: {$filename}");
+        }
+    }
+}

dependencies/guzzlehttp/guzzle/src/Cookie/SessionCookieJar.php

@@ -0,0 +1,71 @@
+<?php
+
+namespace WP_Ultimo\Dependencies\GuzzleHttp\Cookie;
+
+/**
+ * Persists cookies in the client session
+ */
+class SessionCookieJar extends CookieJar
+{
+    /**
+     * @var string session key
+     */
+    private $sessionKey;
+    /**
+     * @var bool Control whether to persist session cookies or not.
+     */
+    private $storeSessionCookies;
+    /**
+     * Create a new SessionCookieJar object
+     *
+     * @param string $sessionKey          Session key name to store the cookie
+     *                                    data in session
+     * @param bool   $storeSessionCookies Set to true to store session cookies
+     *                                    in the cookie jar.
+     */
+    public function __construct(string $sessionKey, bool $storeSessionCookies = \false)
+    {
+        parent::__construct();
+        $this->sessionKey = $sessionKey;
+        $this->storeSessionCookies = $storeSessionCookies;
+        $this->load();
+    }
+    /**
+     * Saves cookies to session when shutting down
+     */
+    public function __destruct()
+    {
+        $this->save();
+    }
+    /**
+     * Save cookies to the client session
+     */
+    public function save() : void
+    {
+        $json = [];
+        /** @var SetCookie $cookie */
+        foreach ($this as $cookie) {
+            if (CookieJar::shouldPersist($cookie, $this->storeSessionCookies)) {
+                $json[] = $cookie->toArray();
+            }
+        }
+        $_SESSION[$this->sessionKey] = \json_encode($json);
+    }
+    /**
+     * Load the contents of the client session into the data array
+     */
+    protected function load() : void
+    {
+        if (!isset($_SESSION[$this->sessionKey])) {
+            return;
+        }
+        $data = \json_decode($_SESSION[$this->sessionKey], \true);
+        if (\is_array($data)) {
+            foreach ($data as $cookie) {
+                $this->setCookie(new SetCookie($cookie));
+            }
+        } elseif (\strlen($data)) {
+            throw new \RuntimeException('Invalid cookie data');
+        }
+    }
+}

dependencies/guzzlehttp/guzzle/src/Cookie/SetCookie.php

@@ -0,0 +1,407 @@
+<?php
+
+namespace WP_Ultimo\Dependencies\GuzzleHttp\Cookie;
+
+/**
+ * Set-Cookie object
+ */
+class SetCookie
+{
+    /**
+     * @var array
+     */
+    private static $defaults = ['Name' => null, 'Value' => null, 'Domain' => null, 'Path' => '/', 'Max-Age' => null, 'Expires' => null, 'Secure' => \false, 'Discard' => \false, 'HttpOnly' => \false];
+    /**
+     * @var array Cookie data
+     */
+    private $data;
+    /**
+     * Create a new SetCookie object from a string.
+     *
+     * @param string $cookie Set-Cookie header string
+     */
+    public static function fromString(string $cookie) : self
+    {
+        // Create the default return array
+        $data = self::$defaults;
+        // Explode the cookie string using a series of semicolons
+        $pieces = \array_filter(\array_map('trim', \explode(';', $cookie)));
+        // The name of the cookie (first kvp) must exist and include an equal sign.
+        if (!isset($pieces[0]) || \strpos($pieces[0], '=') === \false) {
+            return new self($data);
+        }
+        // Add the cookie pieces into the parsed data array
+        foreach ($pieces as $part) {
+            $cookieParts = \explode('=', $part, 2);
+            $key = \trim($cookieParts[0]);
+            $value = isset($cookieParts[1]) ? \trim($cookieParts[1], " \n\r\t\x00\v") : \true;
+            // Only check for non-cookies when cookies have been found
+            if (!isset($data['Name'])) {
+                $data['Name'] = $key;
+                $data['Value'] = $value;
+            } else {
+                foreach (\array_keys(self::$defaults) as $search) {
+                    if (!\strcasecmp($search, $key)) {
+                        if ($search === 'Max-Age') {
+                            if (\is_numeric($value)) {
+                                $data[$search] = (int) $value;
+                            }
+                        } else {
+                            $data[$search] = $value;
+                        }
+                        continue 2;
+                    }
+                }
+                $data[$key] = $value;
+            }
+        }
+        return new self($data);
+    }
+    /**
+     * @param array $data Array of cookie data provided by a Cookie parser
+     */
+    public function __construct(array $data = [])
+    {
+        $this->data = self::$defaults;
+        if (isset($data['Name'])) {
+            $this->setName($data['Name']);
+        }
+        if (isset($data['Value'])) {
+            $this->setValue($data['Value']);
+        }
+        if (isset($data['Domain'])) {
+            $this->setDomain($data['Domain']);
+        }
+        if (isset($data['Path'])) {
+            $this->setPath($data['Path']);
+        }
+        if (isset($data['Max-Age'])) {
+            $this->setMaxAge($data['Max-Age']);
+        }
+        if (isset($data['Expires'])) {
+            $this->setExpires($data['Expires']);
+        }
+        if (isset($data['Secure'])) {
+            $this->setSecure($data['Secure']);
+        }
+        if (isset($data['Discard'])) {
+            $this->setDiscard($data['Discard']);
+        }
+        if (isset($data['HttpOnly'])) {
+            $this->setHttpOnly($data['HttpOnly']);
+        }
+        // Set the remaining values that don't have extra validation logic
+        foreach (\array_diff(\array_keys($data), \array_keys(self::$defaults)) as $key) {
+            $this->data[$key] = $data[$key];
+        }
+        // Extract the Expires value and turn it into a UNIX timestamp if needed
+        if (!$this->getExpires() && $this->getMaxAge()) {
+            // Calculate the Expires date
+            $this->setExpires(\time() + $this->getMaxAge());
+        } elseif (null !== ($expires = $this->getExpires()) && !\is_numeric($expires)) {
+            $this->setExpires($expires);
+        }
+    }
+    public function __toString()
+    {
+        $str = $this->data['Name'] . '=' . ($this->data['Value'] ?? '') . '; ';
+        foreach ($this->data as $k => $v) {
+            if ($k !== 'Name' && $k !== 'Value' && $v !== null && $v !== \false) {
+                if ($k === 'Expires') {
+                    $str .= 'Expires=' . \gmdate('D, d M Y H:i:s \\G\\M\\T', $v) . '; ';
+                } else {
+                    $str .= ($v === \true ? $k : "{$k}={$v}") . '; ';
+                }
+            }
+        }
+        return \rtrim($str, '; ');
+    }
+    public function toArray() : array
+    {
+        return $this->data;
+    }
+    /**
+     * Get the cookie name.
+     *
+     * @return string
+     */
+    public function getName()
+    {
+        return $this->data['Name'];
+    }
+    /**
+     * Set the cookie name.
+     *
+     * @param string $name Cookie name
+     */
+    public function setName($name) : void
+    {
+        if (!\is_string($name)) {
+            trigger_deprecation('guzzlehttp/guzzle', '7.4', 'Not passing a string to %s::%s() is deprecated and will cause an error in 8.0.', __CLASS__, __FUNCTION__);
+        }
+        $this->data['Name'] = (string) $name;
+    }
+    /**
+     * Get the cookie value.
+     *
+     * @return string|null
+     */
+    public function getValue()
+    {
+        return $this->data['Value'];
+    }
+    /**
+     * Set the cookie value.
+     *
+     * @param string $value Cookie value
+     */
+    public function setValue($value) : void
+    {
+        if (!\is_string($value)) {
+            trigger_deprecation('guzzlehttp/guzzle', '7.4', 'Not passing a string to %s::%s() is deprecated and will cause an error in 8.0.', __CLASS__, __FUNCTION__);
+        }
+        $this->data['Value'] = (string) $value;
+    }
+    /**
+     * Get the domain.
+     *
+     * @return string|null
+     */
+    public function getDomain()
+    {
+        return $this->data['Domain'];
+    }
+    /**
+     * Set the domain of the cookie.
+     *
+     * @param string|null $domain
+     */
+    public function setDomain($domain) : void
+    {
+        if (!\is_string($domain) && null !== $domain) {
+            trigger_deprecation('guzzlehttp/guzzle', '7.4', 'Not passing a string or null to %s::%s() is deprecated and will cause an error in 8.0.', __CLASS__, __FUNCTION__);
+        }
+        $this->data['Domain'] = null === $domain ? null : (string) $domain;
+    }
+    /**
+     * Get the path.
+     *
+     * @return string
+     */
+    public function getPath()
+    {
+        return $this->data['Path'];
+    }
+    /**
+     * Set the path of the cookie.
+     *
+     * @param string $path Path of the cookie
+     */
+    public function setPath($path) : void
+    {
+        if (!\is_string($path)) {
+            trigger_deprecation('guzzlehttp/guzzle', '7.4', 'Not passing a string to %s::%s() is deprecated and will cause an error in 8.0.', __CLASS__, __FUNCTION__);
+        }
+        $this->data['Path'] = (string) $path;
+    }
+    /**
+     * Maximum lifetime of the cookie in seconds.
+     *
+     * @return int|null
+     */
+    public function getMaxAge()
+    {
+        return null === $this->data['Max-Age'] ? null : (int) $this->data['Max-Age'];
+    }
+    /**
+     * Set the max-age of the cookie.
+     *
+     * @param int|null $maxAge Max age of the cookie in seconds
+     */
+    public function setMaxAge($maxAge) : void
+    {
+        if (!\is_int($maxAge) && null !== $maxAge) {
+            trigger_deprecation('guzzlehttp/guzzle', '7.4', 'Not passing an int or null to %s::%s() is deprecated and will cause an error in 8.0.', __CLASS__, __FUNCTION__);
+        }
+        $this->data['Max-Age'] = $maxAge === null ? null : (int) $maxAge;
+    }
+    /**
+     * The UNIX timestamp when the cookie Expires.
+     *
+     * @return string|int|null
+     */
+    public function getExpires()
+    {
+        return $this->data['Expires'];
+    }
+    /**
+     * Set the unix timestamp for which the cookie will expire.
+     *
+     * @param int|string|null $timestamp Unix timestamp or any English textual datetime description.
+     */
+    public function setExpires($timestamp) : void
+    {
+        if (!\is_int($timestamp) && !\is_string($timestamp) && null !== $timestamp) {
+            trigger_deprecation('guzzlehttp/guzzle', '7.4', 'Not passing an int, string or null to %s::%s() is deprecated and will cause an error in 8.0.', __CLASS__, __FUNCTION__);
+        }
+        $this->data['Expires'] = null === $timestamp ? null : (\is_numeric($timestamp) ? (int) $timestamp : \strtotime((string) $timestamp));
+    }
+    /**
+     * Get whether or not this is a secure cookie.
+     *
+     * @return bool
+     */
+    public function getSecure()
+    {
+        return $this->data['Secure'];
+    }
+    /**
+     * Set whether or not the cookie is secure.
+     *
+     * @param bool $secure Set to true or false if secure
+     */
+    public function setSecure($secure) : void
+    {
+        if (!\is_bool($secure)) {
+            trigger_deprecation('guzzlehttp/guzzle', '7.4', 'Not passing a bool to %s::%s() is deprecated and will cause an error in 8.0.', __CLASS__, __FUNCTION__);
+        }
+        $this->data['Secure'] = (bool) $secure;
+    }
+    /**
+     * Get whether or not this is a session cookie.
+     *
+     * @return bool|null
+     */
+    public function getDiscard()
+    {
+        return $this->data['Discard'];
+    }
+    /**
+     * Set whether or not this is a session cookie.
+     *
+     * @param bool $discard Set to true or false if this is a session cookie
+     */
+    public function setDiscard($discard) : void
+    {
+        if (!\is_bool($discard)) {
+            trigger_deprecation('guzzlehttp/guzzle', '7.4', 'Not passing a bool to %s::%s() is deprecated and will cause an error in 8.0.', __CLASS__, __FUNCTION__);
+        }
+        $this->data['Discard'] = (bool) $discard;
+    }
+    /**
+     * Get whether or not this is an HTTP only cookie.
+     *
+     * @return bool
+     */
+    public function getHttpOnly()
+    {
+        return $this->data['HttpOnly'];
+    }
+    /**
+     * Set whether or not this is an HTTP only cookie.
+     *
+     * @param bool $httpOnly Set to true or false if this is HTTP only
+     */
+    public function setHttpOnly($httpOnly) : void
+    {
+        if (!\is_bool($httpOnly)) {
+            trigger_deprecation('guzzlehttp/guzzle', '7.4', 'Not passing a bool to %s::%s() is deprecated and will cause an error in 8.0.', __CLASS__, __FUNCTION__);
+        }
+        $this->data['HttpOnly'] = (bool) $httpOnly;
+    }
+    /**
+     * Check if the cookie matches a path value.
+     *
+     * A request-path path-matches a given cookie-path if at least one of
+     * the following conditions holds:
+     *
+     * - The cookie-path and the request-path are identical.
+     * - The cookie-path is a prefix of the request-path, and the last
+     *   character of the cookie-path is %x2F ("/").
+     * - The cookie-path is a prefix of the request-path, and the first
+     *   character of the request-path that is not included in the cookie-
+     *   path is a %x2F ("/") character.
+     *
+     * @param string $requestPath Path to check against
+     */
+    public function matchesPath(string $requestPath) : bool
+    {
+        $cookiePath = $this->getPath();
+        // Match on exact matches or when path is the default empty "/"
+        if ($cookiePath === '/' || $cookiePath == $requestPath) {
+            return \true;
+        }
+        // Ensure that the cookie-path is a prefix of the request path.
+        if (0 !== \strpos($requestPath, $cookiePath)) {
+            return \false;
+        }
+        // Match if the last character of the cookie-path is "/"
+        if (\substr($cookiePath, -1, 1) === '/') {
+            return \true;
+        }
+        // Match if the first character not included in cookie path is "/"
+        return \substr($requestPath, \strlen($cookiePath), 1) === '/';
+    }
+    /**
+     * Check if the cookie matches a domain value.
+     *
+     * @param string $domain Domain to check against
+     */
+    public function matchesDomain(string $domain) : bool
+    {
+        $cookieDomain = $this->getDomain();
+        if (null === $cookieDomain) {
+            return \true;
+        }
+        // Remove the leading '.' as per spec in RFC 6265.
+        // https://tools.ietf.org/html/rfc6265#section-5.2.3
+        $cookieDomain = \ltrim(\strtolower($cookieDomain), '.');
+        $domain = \strtolower($domain);
+        // Domain not set or exact match.
+        if ('' === $cookieDomain || $domain === $cookieDomain) {
+            return \true;
+        }
+        // Matching the subdomain according to RFC 6265.
+        // https://tools.ietf.org/html/rfc6265#section-5.1.3
+        if (\filter_var($domain, \FILTER_VALIDATE_IP)) {
+            return \false;
+        }
+        return (bool) \preg_match('/\\.' . \preg_quote($cookieDomain, '/') . '$/', $domain);
+    }
+    /**
+     * Check if the cookie is expired.
+     */
+    public function isExpired() : bool
+    {
+        return $this->getExpires() !== null && \time() > $this->getExpires();
+    }
+    /**
+     * Check if the cookie is valid according to RFC 6265.
+     *
+     * @return bool|string Returns true if valid or an error message if invalid
+     */
+    public function validate()
+    {
+        $name = $this->getName();
+        if ($name === '') {
+            return 'The cookie name must not be empty';
+        }
+        // Check if any of the invalid characters are present in the cookie name
+        if (\preg_match('/[\\x00-\\x20\\x22\\x28-\\x29\\x2c\\x2f\\x3a-\\x40\\x5c\\x7b\\x7d\\x7f]/', $name)) {
+            return 'Cookie name must not contain invalid characters: ASCII ' . 'Control characters (0-31;127), space, tab and the ' . 'following characters: ()<>@,;:\\"/?={}';
+        }
+        // Value must not be null. 0 and empty string are valid. Empty strings
+        // are technically against RFC 6265, but known to happen in the wild.
+        $value = $this->getValue();
+        if ($value === null) {
+            return 'The cookie value must not be empty';
+        }
+        // Domains must not be empty, but can be 0. "0" is not a valid internet
+        // domain, but may be used as server name in a private network.
+        $domain = $this->getDomain();
+        if ($domain === null || $domain === '') {
+            return 'The cookie domain must not be empty';
+        }
+        return \true;
+    }
+}

dependencies/guzzlehttp/guzzle/src/Exception/BadResponseException.php

@@ -0,0 +1,31 @@
+<?php
+
+namespace WP_Ultimo\Dependencies\GuzzleHttp\Exception;
+
+use WP_Ultimo\Dependencies\Psr\Http\Message\RequestInterface;
+use WP_Ultimo\Dependencies\Psr\Http\Message\ResponseInterface;
+/**
+ * Exception when an HTTP error occurs (4xx or 5xx error)
+ */
+class BadResponseException extends RequestException
+{
+    public function __construct(string $message, RequestInterface $request, ResponseInterface $response, \Throwable $previous = null, array $handlerContext = [])
+    {
+        parent::__construct($message, $request, $response, $previous, $handlerContext);
+    }
+    /**
+     * Current exception and the ones that extend it will always have a response.
+     */
+    public function hasResponse() : bool
+    {
+        return \true;
+    }
+    /**
+     * This function narrows the return type from the parent class and does not allow it to be nullable.
+     */
+    public function getResponse() : ResponseInterface
+    {
+        /** @var ResponseInterface */
+        return parent::getResponse();
+    }
+}

dependencies/guzzlehttp/guzzle/src/Exception/ClientException.php

@@ -0,0 +1,10 @@
+<?php
+
+namespace WP_Ultimo\Dependencies\GuzzleHttp\Exception;
+
+/**
+ * Exception when a client error is encountered (4xx codes)
+ */
+class ClientException extends BadResponseException
+{
+}

dependencies/guzzlehttp/guzzle/src/Exception/ConnectException.php

@@ -0,0 +1,47 @@
+<?php
+
+namespace WP_Ultimo\Dependencies\GuzzleHttp\Exception;
+
+use WP_Ultimo\Dependencies\Psr\Http\Client\NetworkExceptionInterface;
+use WP_Ultimo\Dependencies\Psr\Http\Message\RequestInterface;
+/**
+ * Exception thrown when a connection cannot be established.
+ *
+ * Note that no response is present for a ConnectException
+ */
+class ConnectException extends TransferException implements NetworkExceptionInterface
+{
+    /**
+     * @var RequestInterface
+     */
+    private $request;
+    /**
+     * @var array
+     */
+    private $handlerContext;
+    public function __construct(string $message, RequestInterface $request, \Throwable $previous = null, array $handlerContext = [])
+    {
+        parent::__construct($message, 0, $previous);
+        $this->request = $request;
+        $this->handlerContext = $handlerContext;
+    }
+    /**
+     * Get the request that caused the exception
+     */
+    public function getRequest() : RequestInterface
+    {
+        return $this->request;
+    }
+    /**
+     * Get contextual information about the error from the underlying handler.
+     *
+     * The contents of this array will vary depending on which handler you are
+     * using. It may also be just an empty array. Relying on this data will
+     * couple you to a specific handler, but can give more debug information
+     * when needed.
+     */
+    public function getHandlerContext() : array
+    {
+        return $this->handlerContext;
+    }
+}

dependencies/guzzlehttp/guzzle/src/Exception/GuzzleException.php

@@ -0,0 +1,8 @@
+<?php
+
+namespace WP_Ultimo\Dependencies\GuzzleHttp\Exception;
+
+use WP_Ultimo\Dependencies\Psr\Http\Client\ClientExceptionInterface;
+interface GuzzleException extends ClientExceptionInterface
+{
+}

dependencies/guzzlehttp/guzzle/src/Exception/InvalidArgumentException.php

@@ -0,0 +1,7 @@
+<?php
+
+namespace WP_Ultimo\Dependencies\GuzzleHttp\Exception;
+
+final class InvalidArgumentException extends \InvalidArgumentException implements GuzzleException
+{
+}

dependencies/guzzlehttp/guzzle/src/Exception/RequestException.php

@@ -0,0 +1,124 @@
+<?php
+
+namespace WP_Ultimo\Dependencies\GuzzleHttp\Exception;
+
+use WP_Ultimo\Dependencies\GuzzleHttp\BodySummarizer;
+use WP_Ultimo\Dependencies\GuzzleHttp\BodySummarizerInterface;
+use WP_Ultimo\Dependencies\Psr\Http\Client\RequestExceptionInterface;
+use WP_Ultimo\Dependencies\Psr\Http\Message\RequestInterface;
+use WP_Ultimo\Dependencies\Psr\Http\Message\ResponseInterface;
+use WP_Ultimo\Dependencies\Psr\Http\Message\UriInterface;
+/**
+ * HTTP Request exception
+ */
+class RequestException extends TransferException implements RequestExceptionInterface
+{
+    /**
+     * @var RequestInterface
+     */
+    private $request;
+    /**
+     * @var ResponseInterface|null
+     */
+    private $response;
+    /**
+     * @var array
+     */
+    private $handlerContext;
+    public function __construct(string $message, RequestInterface $request, ResponseInterface $response = null, \Throwable $previous = null, array $handlerContext = [])
+    {
+        // Set the code of the exception if the response is set and not future.
+        $code = $response ? $response->getStatusCode() : 0;
+        parent::__construct($message, $code, $previous);
+        $this->request = $request;
+        $this->response = $response;
+        $this->handlerContext = $handlerContext;
+    }
+    /**
+     * Wrap non-RequestExceptions with a RequestException
+     */
+    public static function wrapException(RequestInterface $request, \Throwable $e) : RequestException
+    {
+        return $e instanceof RequestException ? $e : new RequestException($e->getMessage(), $request, null, $e);
+    }
+    /**
+     * Factory method to create a new exception with a normalized error message
+     *
+     * @param RequestInterface             $request        Request sent
+     * @param ResponseInterface            $response       Response received
+     * @param \Throwable|null              $previous       Previous exception
+     * @param array                        $handlerContext Optional handler context
+     * @param BodySummarizerInterface|null $bodySummarizer Optional body summarizer
+     */
+    public static function create(RequestInterface $request, ResponseInterface $response = null, \Throwable $previous = null, array $handlerContext = [], BodySummarizerInterface $bodySummarizer = null) : self
+    {
+        if (!$response) {
+            return new self('Error completing request', $request, null, $previous, $handlerContext);
+        }
+        $level = (int) \floor($response->getStatusCode() / 100);
+        if ($level === 4) {
+            $label = 'Client error';
+            $className = ClientException::class;
+        } elseif ($level === 5) {
+            $label = 'Server error';
+            $className = ServerException::class;
+        } else {
+            $label = 'Unsuccessful request';
+            $className = __CLASS__;
+        }
+        $uri = $request->getUri();
+        $uri = static::obfuscateUri($uri);
+        // Client Error: `GET /` resulted in a `404 Not Found` response:
+        // <html> ... (truncated)
+        $message = \sprintf('%s: `%s %s` resulted in a `%s %s` response', $label, $request->getMethod(), $uri->__toString(), $response->getStatusCode(), $response->getReasonPhrase());
+        $summary = ($bodySummarizer ?? new BodySummarizer())->summarize($response);
+        if ($summary !== null) {
+            $message .= ":\n{$summary}\n";
+        }
+        return new $className($message, $request, $response, $previous, $handlerContext);
+    }
+    /**
+     * Obfuscates URI if there is a username and a password present
+     */
+    private static function obfuscateUri(UriInterface $uri) : UriInterface
+    {
+        $userInfo = $uri->getUserInfo();
+        if (\false !== ($pos = \strpos($userInfo, ':'))) {
+            return $uri->withUserInfo(\substr($userInfo, 0, $pos), '***');
+        }
+        return $uri;
+    }
+    /**
+     * Get the request that caused the exception
+     */
+    public function getRequest() : RequestInterface
+    {
+        return $this->request;
+    }
+    /**
+     * Get the associated response
+     */
+    public function getResponse() : ?ResponseInterface
+    {
+        return $this->response;
+    }
+    /**
+     * Check if a response was received
+     */
+    public function hasResponse() : bool
+    {
+        return $this->response !== null;
+    }
+    /**
+     * Get contextual information about the error from the underlying handler.
+     *
+     * The contents of this array will vary depending on which handler you are
+     * using. It may also be just an empty array. Relying on this data will
+     * couple you to a specific handler, but can give more debug information
+     * when needed.
+     */
+    public function getHandlerContext() : array
+    {
+        return $this->handlerContext;
+    }
+}

dependencies/guzzlehttp/guzzle/src/Exception/ServerException.php

@@ -0,0 +1,10 @@
+<?php
+
+namespace WP_Ultimo\Dependencies\GuzzleHttp\Exception;
+
+/**
+ * Exception when a server error is encountered (5xx codes)
+ */
+class ServerException extends BadResponseException
+{
+}

dependencies/guzzlehttp/guzzle/src/Exception/TooManyRedirectsException.php

@@ -0,0 +1,7 @@
+<?php
+
+namespace WP_Ultimo\Dependencies\GuzzleHttp\Exception;
+
+class TooManyRedirectsException extends RequestException
+{
+}

dependencies/guzzlehttp/guzzle/src/Exception/TransferException.php

@@ -0,0 +1,7 @@
+<?php
+
+namespace WP_Ultimo\Dependencies\GuzzleHttp\Exception;
+
+class TransferException extends \RuntimeException implements GuzzleException
+{
+}

dependencies/guzzlehttp/guzzle/src/Handler/CurlFactory.php

@@ -0,0 +1,496 @@
+<?php
+
+namespace WP_Ultimo\Dependencies\GuzzleHttp\Handler;
+
+use WP_Ultimo\Dependencies\GuzzleHttp\Exception\ConnectException;
+use WP_Ultimo\Dependencies\GuzzleHttp\Exception\RequestException;
+use WP_Ultimo\Dependencies\GuzzleHttp\Promise as P;
+use WP_Ultimo\Dependencies\GuzzleHttp\Promise\FulfilledPromise;
+use WP_Ultimo\Dependencies\GuzzleHttp\Promise\PromiseInterface;
+use WP_Ultimo\Dependencies\GuzzleHttp\Psr7\LazyOpenStream;
+use WP_Ultimo\Dependencies\GuzzleHttp\TransferStats;
+use WP_Ultimo\Dependencies\GuzzleHttp\Utils;
+use WP_Ultimo\Dependencies\Psr\Http\Message\RequestInterface;
+/**
+ * Creates curl resources from a request
+ *
+ * @final
+ */
+class CurlFactory implements CurlFactoryInterface
+{
+    public const CURL_VERSION_STR = 'curl_version';
+    /**
+     * @deprecated
+     */
+    public const LOW_CURL_VERSION_NUMBER = '7.21.2';
+    /**
+     * @var resource[]|\CurlHandle[]
+     */
+    private $handles = [];
+    /**
+     * @var int Total number of idle handles to keep in cache
+     */
+    private $maxHandles;
+    /**
+     * @param int $maxHandles Maximum number of idle handles.
+     */
+    public function __construct(int $maxHandles)
+    {
+        $this->maxHandles = $maxHandles;
+    }
+    public function create(RequestInterface $request, array $options) : EasyHandle
+    {
+        if (isset($options['curl']['body_as_string'])) {
+            $options['_body_as_string'] = $options['curl']['body_as_string'];
+            unset($options['curl']['body_as_string']);
+        }
+        $easy = new EasyHandle();
+        $easy->request = $request;
+        $easy->options = $options;
+        $conf = $this->getDefaultConf($easy);
+        $this->applyMethod($easy, $conf);
+        $this->applyHandlerOptions($easy, $conf);
+        $this->applyHeaders($easy, $conf);
+        unset($conf['_headers']);
+        // Add handler options from the request configuration options
+        if (isset($options['curl'])) {
+            $conf = \array_replace($conf, $options['curl']);
+        }
+        $conf[\CURLOPT_HEADERFUNCTION] = $this->createHeaderFn($easy);
+        $easy->handle = $this->handles ? \array_pop($this->handles) : \curl_init();
+        \curl_setopt_array($easy->handle, $conf);
+        return $easy;
+    }
+    public function release(EasyHandle $easy) : void
+    {
+        $resource = $easy->handle;
+        unset($easy->handle);
+        if (\count($this->handles) >= $this->maxHandles) {
+            \curl_close($resource);
+        } else {
+            // Remove all callback functions as they can hold onto references
+            // and are not cleaned up by curl_reset. Using curl_setopt_array
+            // does not work for some reason, so removing each one
+            // individually.
+            \curl_setopt($resource, \CURLOPT_HEADERFUNCTION, null);
+            \curl_setopt($resource, \CURLOPT_READFUNCTION, null);
+            \curl_setopt($resource, \CURLOPT_WRITEFUNCTION, null);
+            \curl_setopt($resource, \CURLOPT_PROGRESSFUNCTION, null);
+            \curl_reset($resource);
+            $this->handles[] = $resource;
+        }
+    }
+    /**
+     * Completes a cURL transaction, either returning a response promise or a
+     * rejected promise.
+     *
+     * @param callable(RequestInterface, array): PromiseInterface $handler
+     * @param CurlFactoryInterface                                $factory Dictates how the handle is released
+     */
+    public static function finish(callable $handler, EasyHandle $easy, CurlFactoryInterface $factory) : PromiseInterface
+    {
+        if (isset($easy->options['on_stats'])) {
+            self::invokeStats($easy);
+        }
+        if (!$easy->response || $easy->errno) {
+            return self::finishError($handler, $easy, $factory);
+        }
+        // Return the response if it is present and there is no error.
+        $factory->release($easy);
+        // Rewind the body of the response if possible.
+        $body = $easy->response->getBody();
+        if ($body->isSeekable()) {
+            $body->rewind();
+        }
+        return new FulfilledPromise($easy->response);
+    }
+    private static function invokeStats(EasyHandle $easy) : void
+    {
+        $curlStats = \curl_getinfo($easy->handle);
+        $curlStats['appconnect_time'] = \curl_getinfo($easy->handle, \CURLINFO_APPCONNECT_TIME);
+        $stats = new TransferStats($easy->request, $easy->response, $curlStats['total_time'], $easy->errno, $curlStats);
+        $easy->options['on_stats']($stats);
+    }
+    /**
+     * @param callable(RequestInterface, array): PromiseInterface $handler
+     */
+    private static function finishError(callable $handler, EasyHandle $easy, CurlFactoryInterface $factory) : PromiseInterface
+    {
+        // Get error information and release the handle to the factory.
+        $ctx = ['errno' => $easy->errno, 'error' => \curl_error($easy->handle), 'appconnect_time' => \curl_getinfo($easy->handle, \CURLINFO_APPCONNECT_TIME)] + \curl_getinfo($easy->handle);
+        $ctx[self::CURL_VERSION_STR] = \curl_version()['version'];
+        $factory->release($easy);
+        // Retry when nothing is present or when curl failed to rewind.
+        if (empty($easy->options['_err_message']) && (!$easy->errno || $easy->errno == 65)) {
+            return self::retryFailedRewind($handler, $easy, $ctx);
+        }
+        return self::createRejection($easy, $ctx);
+    }
+    private static function createRejection(EasyHandle $easy, array $ctx) : PromiseInterface
+    {
+        static $connectionErrors = [\CURLE_OPERATION_TIMEOUTED => \true, \CURLE_COULDNT_RESOLVE_HOST => \true, \CURLE_COULDNT_CONNECT => \true, \CURLE_SSL_CONNECT_ERROR => \true, \CURLE_GOT_NOTHING => \true];
+        if ($easy->createResponseException) {
+            return P\Create::rejectionFor(new RequestException('An error was encountered while creating the response', $easy->request, $easy->response, $easy->createResponseException, $ctx));
+        }
+        // If an exception was encountered during the onHeaders event, then
+        // return a rejected promise that wraps that exception.
+        if ($easy->onHeadersException) {
+            return P\Create::rejectionFor(new RequestException('An error was encountered during the on_headers event', $easy->request, $easy->response, $easy->onHeadersException, $ctx));
+        }
+        $message = \sprintf('cURL error %s: %s (%s)', $ctx['errno'], $ctx['error'], 'see https://curl.haxx.se/libcurl/c/libcurl-errors.html');
+        $uriString = (string) $easy->request->getUri();
+        if ($uriString !== '' && \false === \strpos($ctx['error'], $uriString)) {
+            $message .= \sprintf(' for %s', $uriString);
+        }
+        // Create a connection exception if it was a specific error code.
+        $error = isset($connectionErrors[$easy->errno]) ? new ConnectException($message, $easy->request, null, $ctx) : new RequestException($message, $easy->request, $easy->response, null, $ctx);
+        return P\Create::rejectionFor($error);
+    }
+    /**
+     * @return array<int|string, mixed>
+     */
+    private function getDefaultConf(EasyHandle $easy) : array
+    {
+        $conf = ['_headers' => $easy->request->getHeaders(), \CURLOPT_CUSTOMREQUEST => $easy->request->getMethod(), \CURLOPT_URL => (string) $easy->request->getUri()->withFragment(''), \CURLOPT_RETURNTRANSFER => \false, \CURLOPT_HEADER => \false, \CURLOPT_CONNECTTIMEOUT => 300];
+        if (\defined('CURLOPT_PROTOCOLS')) {
+            $conf[\CURLOPT_PROTOCOLS] = \CURLPROTO_HTTP | \CURLPROTO_HTTPS;
+        }
+        $version = $easy->request->getProtocolVersion();
+        if ($version == 1.1) {
+            $conf[\CURLOPT_HTTP_VERSION] = \CURL_HTTP_VERSION_1_1;
+        } elseif ($version == 2.0) {
+            $conf[\CURLOPT_HTTP_VERSION] = \CURL_HTTP_VERSION_2_0;
+        } else {
+            $conf[\CURLOPT_HTTP_VERSION] = \CURL_HTTP_VERSION_1_0;
+        }
+        return $conf;
+    }
+    private function applyMethod(EasyHandle $easy, array &$conf) : void
+    {
+        $body = $easy->request->getBody();
+        $size = $body->getSize();
+        if ($size === null || $size > 0) {
+            $this->applyBody($easy->request, $easy->options, $conf);
+            return;
+        }
+        $method = $easy->request->getMethod();
+        if ($method === 'PUT' || $method === 'POST') {
+            // See https://tools.ietf.org/html/rfc7230#section-3.3.2
+            if (!$easy->request->hasHeader('Content-Length')) {
+                $conf[\CURLOPT_HTTPHEADER][] = 'Content-Length: 0';
+            }
+        } elseif ($method === 'HEAD') {
+            $conf[\CURLOPT_NOBODY] = \true;
+            unset($conf[\CURLOPT_WRITEFUNCTION], $conf[\CURLOPT_READFUNCTION], $conf[\CURLOPT_FILE], $conf[\CURLOPT_INFILE]);
+        }
+    }
+    private function applyBody(RequestInterface $request, array $options, array &$conf) : void
+    {
+        $size = $request->hasHeader('Content-Length') ? (int) $request->getHeaderLine('Content-Length') : null;
+        // Send the body as a string if the size is less than 1MB OR if the
+        // [curl][body_as_string] request value is set.
+        if ($size !== null && $size < 1000000 || !empty($options['_body_as_string'])) {
+            $conf[\CURLOPT_POSTFIELDS] = (string) $request->getBody();
+            // Don't duplicate the Content-Length header
+            $this->removeHeader('Content-Length', $conf);
+            $this->removeHeader('Transfer-Encoding', $conf);
+        } else {
+            $conf[\CURLOPT_UPLOAD] = \true;
+            if ($size !== null) {
+                $conf[\CURLOPT_INFILESIZE] = $size;
+                $this->removeHeader('Content-Length', $conf);
+            }
+            $body = $request->getBody();
+            if ($body->isSeekable()) {
+                $body->rewind();
+            }
+            $conf[\CURLOPT_READFUNCTION] = static function ($ch, $fd, $length) use($body) {
+                return $body->read($length);
+            };
+        }
+        // If the Expect header is not present, prevent curl from adding it
+        if (!$request->hasHeader('Expect')) {
+            $conf[\CURLOPT_HTTPHEADER][] = 'Expect:';
+        }
+        // cURL sometimes adds a content-type by default. Prevent this.
+        if (!$request->hasHeader('Content-Type')) {
+            $conf[\CURLOPT_HTTPHEADER][] = 'Content-Type:';
+        }
+    }
+    private function applyHeaders(EasyHandle $easy, array &$conf) : void
+    {
+        foreach ($conf['_headers'] as $name => $values) {
+            foreach ($values as $value) {
+                $value = (string) $value;
+                if ($value === '') {
+                    // cURL requires a special format for empty headers.
+                    // See https://github.com/guzzle/guzzle/issues/1882 for more details.
+                    $conf[\CURLOPT_HTTPHEADER][] = "{$name};";
+                } else {
+                    $conf[\CURLOPT_HTTPHEADER][] = "{$name}: {$value}";
+                }
+            }
+        }
+        // Remove the Accept header if one was not set
+        if (!$easy->request->hasHeader('Accept')) {
+            $conf[\CURLOPT_HTTPHEADER][] = 'Accept:';
+        }
+    }
+    /**
+     * Remove a header from the options array.
+     *
+     * @param string $name    Case-insensitive header to remove
+     * @param array  $options Array of options to modify
+     */
+    private function removeHeader(string $name, array &$options) : void
+    {
+        foreach (\array_keys($options['_headers']) as $key) {
+            if (!\strcasecmp($key, $name)) {
+                unset($options['_headers'][$key]);
+                return;
+            }
+        }
+    }
+    private function applyHandlerOptions(EasyHandle $easy, array &$conf) : void
+    {
+        $options = $easy->options;
+        if (isset($options['verify'])) {
+            if ($options['verify'] === \false) {
+                unset($conf[\CURLOPT_CAINFO]);
+                $conf[\CURLOPT_SSL_VERIFYHOST] = 0;
+                $conf[\CURLOPT_SSL_VERIFYPEER] = \false;
+            } else {
+                $conf[\CURLOPT_SSL_VERIFYHOST] = 2;
+                $conf[\CURLOPT_SSL_VERIFYPEER] = \true;
+                if (\is_string($options['verify'])) {
+                    // Throw an error if the file/folder/link path is not valid or doesn't exist.
+                    if (!\file_exists($options['verify'])) {
+                        throw new \InvalidArgumentException("SSL CA bundle not found: {$options['verify']}");
+                    }
+                    // If it's a directory or a link to a directory use CURLOPT_CAPATH.
+                    // If not, it's probably a file, or a link to a file, so use CURLOPT_CAINFO.
+                    if (\is_dir($options['verify']) || \is_link($options['verify']) === \true && ($verifyLink = \readlink($options['verify'])) !== \false && \is_dir($verifyLink)) {
+                        $conf[\CURLOPT_CAPATH] = $options['verify'];
+                    } else {
+                        $conf[\CURLOPT_CAINFO] = $options['verify'];
+                    }
+                }
+            }
+        }
+        if (!isset($options['curl'][\CURLOPT_ENCODING]) && !empty($options['decode_content'])) {
+            $accept = $easy->request->getHeaderLine('Accept-Encoding');
+            if ($accept) {
+                $conf[\CURLOPT_ENCODING] = $accept;
+            } else {
+                // The empty string enables all available decoders and implicitly
+                // sets a matching 'Accept-Encoding' header.
+                $conf[\CURLOPT_ENCODING] = '';
+                // But as the user did not specify any acceptable encodings we need
+                // to overwrite this implicit header with an empty one.
+                $conf[\CURLOPT_HTTPHEADER][] = 'Accept-Encoding:';
+            }
+        }
+        if (!isset($options['sink'])) {
+            // Use a default temp stream if no sink was set.
+            $options['sink'] = \WP_Ultimo\Dependencies\GuzzleHttp\Psr7\Utils::tryFopen('php://temp', 'w+');
+        }
+        $sink = $options['sink'];
+        if (!\is_string($sink)) {
+            $sink = \WP_Ultimo\Dependencies\GuzzleHttp\Psr7\Utils::streamFor($sink);
+        } elseif (!\is_dir(\dirname($sink))) {
+            // Ensure that the directory exists before failing in curl.
+            throw new \RuntimeException(\sprintf('Directory %s does not exist for sink value of %s', \dirname($sink), $sink));
+        } else {
+            $sink = new LazyOpenStream($sink, 'w+');
+        }
+        $easy->sink = $sink;
+        $conf[\CURLOPT_WRITEFUNCTION] = static function ($ch, $write) use($sink) : int {
+            return $sink->write($write);
+        };
+        $timeoutRequiresNoSignal = \false;
+        if (isset($options['timeout'])) {
+            $timeoutRequiresNoSignal |= $options['timeout'] < 1;
+            $conf[\CURLOPT_TIMEOUT_MS] = $options['timeout'] * 1000;
+        }
+        // CURL default value is CURL_IPRESOLVE_WHATEVER
+        if (isset($options['force_ip_resolve'])) {
+            if ('v4' === $options['force_ip_resolve']) {
+                $conf[\CURLOPT_IPRESOLVE] = \CURL_IPRESOLVE_V4;
+            } elseif ('v6' === $options['force_ip_resolve']) {
+                $conf[\CURLOPT_IPRESOLVE] = \CURL_IPRESOLVE_V6;
+            }
+        }
+        if (isset($options['connect_timeout'])) {
+            $timeoutRequiresNoSignal |= $options['connect_timeout'] < 1;
+            $conf[\CURLOPT_CONNECTTIMEOUT_MS] = $options['connect_timeout'] * 1000;
+        }
+        if ($timeoutRequiresNoSignal && \strtoupper(\substr(\PHP_OS, 0, 3)) !== 'WIN') {
+            $conf[\CURLOPT_NOSIGNAL] = \true;
+        }
+        if (isset($options['proxy'])) {
+            if (!\is_array($options['proxy'])) {
+                $conf[\CURLOPT_PROXY] = $options['proxy'];
+            } else {
+                $scheme = $easy->request->getUri()->getScheme();
+                if (isset($options['proxy'][$scheme])) {
+                    $host = $easy->request->getUri()->getHost();
+                    if (isset($options['proxy']['no']) && Utils::isHostInNoProxy($host, $options['proxy']['no'])) {
+                        unset($conf[\CURLOPT_PROXY]);
+                    } else {
+                        $conf[\CURLOPT_PROXY] = $options['proxy'][$scheme];
+                    }
+                }
+            }
+        }
+        if (isset($options['crypto_method'])) {
+            if (\STREAM_CRYPTO_METHOD_TLSv1_0_CLIENT === $options['crypto_method']) {
+                if (!\defined('CURL_SSLVERSION_TLSv1_0')) {
+                    throw new \InvalidArgumentException('Invalid crypto_method request option: TLS 1.0 not supported by your version of cURL');
+                }
+                $conf[\CURLOPT_SSLVERSION] = \CURL_SSLVERSION_TLSv1_0;
+            } elseif (\STREAM_CRYPTO_METHOD_TLSv1_1_CLIENT === $options['crypto_method']) {
+                if (!\defined('CURL_SSLVERSION_TLSv1_1')) {
+                    throw new \InvalidArgumentException('Invalid crypto_method request option: TLS 1.1 not supported by your version of cURL');
+                }
+                $conf[\CURLOPT_SSLVERSION] = \CURL_SSLVERSION_TLSv1_1;
+            } elseif (\STREAM_CRYPTO_METHOD_TLSv1_2_CLIENT === $options['crypto_method']) {
+                if (!\defined('CURL_SSLVERSION_TLSv1_2')) {
+                    throw new \InvalidArgumentException('Invalid crypto_method request option: TLS 1.2 not supported by your version of cURL');
+                }
+                $conf[\CURLOPT_SSLVERSION] = \CURL_SSLVERSION_TLSv1_2;
+            } elseif (\defined('STREAM_CRYPTO_METHOD_TLSv1_3_CLIENT') && \STREAM_CRYPTO_METHOD_TLSv1_3_CLIENT === $options['crypto_method']) {
+                if (!\defined('CURL_SSLVERSION_TLSv1_3')) {
+                    throw new \InvalidArgumentException('Invalid crypto_method request option: TLS 1.3 not supported by your version of cURL');
+                }
+                $conf[\CURLOPT_SSLVERSION] = \CURL_SSLVERSION_TLSv1_3;
+            } else {
+                throw new \InvalidArgumentException('Invalid crypto_method request option: unknown version provided');
+            }
+        }
+        if (isset($options['cert'])) {
+            $cert = $options['cert'];
+            if (\is_array($cert)) {
+                $conf[\CURLOPT_SSLCERTPASSWD] = $cert[1];
+                $cert = $cert[0];
+            }
+            if (!\file_exists($cert)) {
+                throw new \InvalidArgumentException("SSL certificate not found: {$cert}");
+            }
+            // OpenSSL (versions 0.9.3 and later) also support "P12" for PKCS#12-encoded files.
+            // see https://curl.se/libcurl/c/CURLOPT_SSLCERTTYPE.html
+            $ext = \pathinfo($cert, \PATHINFO_EXTENSION);
+            if (\preg_match('#^(der|p12)$#i', $ext)) {
+                $conf[\CURLOPT_SSLCERTTYPE] = \strtoupper($ext);
+            }
+            $conf[\CURLOPT_SSLCERT] = $cert;
+        }
+        if (isset($options['ssl_key'])) {
+            if (\is_array($options['ssl_key'])) {
+                if (\count($options['ssl_key']) === 2) {
+                    [$sslKey, $conf[\CURLOPT_SSLKEYPASSWD]] = $options['ssl_key'];
+                } else {
+                    [$sslKey] = $options['ssl_key'];
+                }
+            }
+            $sslKey = $sslKey ?? $options['ssl_key'];
+            if (!\file_exists($sslKey)) {
+                throw new \InvalidArgumentException("SSL private key not found: {$sslKey}");
+            }
+            $conf[\CURLOPT_SSLKEY] = $sslKey;
+        }
+        if (isset($options['progress'])) {
+            $progress = $options['progress'];
+            if (!\is_callable($progress)) {
+                throw new \InvalidArgumentException('progress client option must be callable');
+            }
+            $conf[\CURLOPT_NOPROGRESS] = \false;
+            $conf[\CURLOPT_PROGRESSFUNCTION] = static function ($resource, int $downloadSize, int $downloaded, int $uploadSize, int $uploaded) use($progress) {
+                $progress($downloadSize, $downloaded, $uploadSize, $uploaded);
+            };
+        }
+        if (!empty($options['debug'])) {
+            $conf[\CURLOPT_STDERR] = Utils::debugResource($options['debug']);
+            $conf[\CURLOPT_VERBOSE] = \true;
+        }
+    }
+    /**
+     * This function ensures that a response was set on a transaction. If one
+     * was not set, then the request is retried if possible. This error
+     * typically means you are sending a payload, curl encountered a
+     * "Connection died, retrying a fresh connect" error, tried to rewind the
+     * stream, and then encountered a "necessary data rewind wasn't possible"
+     * error, causing the request to be sent through curl_multi_info_read()
+     * without an error status.
+     *
+     * @param callable(RequestInterface, array): PromiseInterface $handler
+     */
+    private static function retryFailedRewind(callable $handler, EasyHandle $easy, array $ctx) : PromiseInterface
+    {
+        try {
+            // Only rewind if the body has been read from.
+            $body = $easy->request->getBody();
+            if ($body->tell() > 0) {
+                $body->rewind();
+            }
+        } catch (\RuntimeException $e) {
+            $ctx['error'] = 'The connection unexpectedly failed without ' . 'providing an error. The request would have been retried, ' . 'but attempting to rewind the request body failed. ' . 'Exception: ' . $e;
+            return self::createRejection($easy, $ctx);
+        }
+        // Retry no more than 3 times before giving up.
+        if (!isset($easy->options['_curl_retries'])) {
+            $easy->options['_curl_retries'] = 1;
+        } elseif ($easy->options['_curl_retries'] == 2) {
+            $ctx['error'] = 'The cURL request was retried 3 times ' . 'and did not succeed. The most likely reason for the failure ' . 'is that cURL was unable to rewind the body of the request ' . 'and subsequent retries resulted in the same error. Turn on ' . 'the debug option to see what went wrong. See ' . 'https://bugs.php.net/bug.php?id=47204 for more information.';
+            return self::createRejection($easy, $ctx);
+        } else {
+            ++$easy->options['_curl_retries'];
+        }
+        return $handler($easy->request, $easy->options);
+    }
+    private function createHeaderFn(EasyHandle $easy) : callable
+    {
+        if (isset($easy->options['on_headers'])) {
+            $onHeaders = $easy->options['on_headers'];
+            if (!\is_callable($onHeaders)) {
+                throw new \InvalidArgumentException('on_headers must be callable');
+            }
+        } else {
+            $onHeaders = null;
+        }
+        return static function ($ch, $h) use($onHeaders, $easy, &$startingResponse) {
+            $value = \trim($h);
+            if ($value === '') {
+                $startingResponse = \true;
+                try {
+                    $easy->createResponse();
+                } catch (\Exception $e) {
+                    $easy->createResponseException = $e;
+                    return -1;
+                }
+                if ($onHeaders !== null) {
+                    try {
+                        $onHeaders($easy->response);
+                    } catch (\Exception $e) {
+                        // Associate the exception with the handle and trigger
+                        // a curl header write error by returning 0.
+                        $easy->onHeadersException = $e;
+                        return -1;
+                    }
+                }
+            } elseif ($startingResponse) {
+                $startingResponse = \false;
+                $easy->headers = [$value];
+            } else {
+                $easy->headers[] = $value;
+            }
+            return \strlen($h);
+        };
+    }
+    public function __destruct()
+    {
+        foreach ($this->handles as $id => $handle) {
+            \curl_close($handle);
+            unset($this->handles[$id]);
+        }
+    }
+}

dependencies/guzzlehttp/guzzle/src/Handler/CurlFactoryInterface.php

@@ -0,0 +1,23 @@
+<?php
+
+namespace WP_Ultimo\Dependencies\GuzzleHttp\Handler;
+
+use WP_Ultimo\Dependencies\Psr\Http\Message\RequestInterface;
+interface CurlFactoryInterface
+{
+    /**
+     * Creates a cURL handle resource.
+     *
+     * @param RequestInterface $request Request
+     * @param array            $options Transfer options
+     *
+     * @throws \RuntimeException when an option cannot be applied
+     */
+    public function create(RequestInterface $request, array $options) : EasyHandle;
+    /**
+     * Release an easy handle, allowing it to be reused or closed.
+     *
+     * This function must call unset on the easy handle's "handle" property.
+     */
+    public function release(EasyHandle $easy) : void;
+}

dependencies/guzzlehttp/guzzle/src/Handler/CurlHandler.php

@@ -0,0 +1,43 @@
+<?php
+
+namespace WP_Ultimo\Dependencies\GuzzleHttp\Handler;
+
+use WP_Ultimo\Dependencies\GuzzleHttp\Promise\PromiseInterface;
+use WP_Ultimo\Dependencies\Psr\Http\Message\RequestInterface;
+/**
+ * HTTP handler that uses cURL easy handles as a transport layer.
+ *
+ * When using the CurlHandler, custom curl options can be specified as an
+ * associative array of curl option constants mapping to values in the
+ * **curl** key of the "client" key of the request.
+ *
+ * @final
+ */
+class CurlHandler
+{
+    /**
+     * @var CurlFactoryInterface
+     */
+    private $factory;
+    /**
+     * Accepts an associative array of options:
+     *
+     * - handle_factory: Optional curl factory used to create cURL handles.
+     *
+     * @param array{handle_factory?: ?CurlFactoryInterface} $options Array of options to use with the handler
+     */
+    public function __construct(array $options = [])
+    {
+        $this->factory = $options['handle_factory'] ?? new CurlFactory(3);
+    }
+    public function __invoke(RequestInterface $request, array $options) : PromiseInterface
+    {
+        if (isset($options['delay'])) {
+            \usleep($options['delay'] * 1000);
+        }
+        $easy = $this->factory->create($request, $options);
+        \curl_exec($easy->handle);
+        $easy->errno = \curl_errno($easy->handle);
+        return CurlFactory::finish($this, $easy, $this->factory);
+    }
+}

dependencies/guzzlehttp/guzzle/src/Handler/CurlMultiHandler.php

@@ -0,0 +1,220 @@
+<?php
+
+namespace WP_Ultimo\Dependencies\GuzzleHttp\Handler;
+
+use WP_Ultimo\Dependencies\GuzzleHttp\Promise as P;
+use WP_Ultimo\Dependencies\GuzzleHttp\Promise\Promise;
+use WP_Ultimo\Dependencies\GuzzleHttp\Promise\PromiseInterface;
+use WP_Ultimo\Dependencies\GuzzleHttp\Utils;
+use WP_Ultimo\Dependencies\Psr\Http\Message\RequestInterface;
+/**
+ * Returns an asynchronous response using curl_multi_* functions.
+ *
+ * When using the CurlMultiHandler, custom curl options can be specified as an
+ * associative array of curl option constants mapping to values in the
+ * **curl** key of the provided request options.
+ *
+ * @final
+ */
+class CurlMultiHandler
+{
+    /**
+     * @var CurlFactoryInterface
+     */
+    private $factory;
+    /**
+     * @var int
+     */
+    private $selectTimeout;
+    /**
+     * @var int Will be higher than 0 when `curl_multi_exec` is still running.
+     */
+    private $active = 0;
+    /**
+     * @var array Request entry handles, indexed by handle id in `addRequest`.
+     *
+     * @see CurlMultiHandler::addRequest
+     */
+    private $handles = [];
+    /**
+     * @var array<int, float> An array of delay times, indexed by handle id in `addRequest`.
+     *
+     * @see CurlMultiHandler::addRequest
+     */
+    private $delays = [];
+    /**
+     * @var array<mixed> An associative array of CURLMOPT_* options and corresponding values for curl_multi_setopt()
+     */
+    private $options = [];
+    /** @var resource|\CurlMultiHandle */
+    private $_mh;
+    /**
+     * This handler accepts the following options:
+     *
+     * - handle_factory: An optional factory  used to create curl handles
+     * - select_timeout: Optional timeout (in seconds) to block before timing
+     *   out while selecting curl handles. Defaults to 1 second.
+     * - options: An associative array of CURLMOPT_* options and
+     *   corresponding values for curl_multi_setopt()
+     */
+    public function __construct(array $options = [])
+    {
+        $this->factory = $options['handle_factory'] ?? new CurlFactory(50);
+        if (isset($options['select_timeout'])) {
+            $this->selectTimeout = $options['select_timeout'];
+        } elseif ($selectTimeout = Utils::getenv('GUZZLE_CURL_SELECT_TIMEOUT')) {
+            @\trigger_error('Since guzzlehttp/guzzle 7.2.0: Using environment variable GUZZLE_CURL_SELECT_TIMEOUT is deprecated. Use option "select_timeout" instead.', \E_USER_DEPRECATED);
+            $this->selectTimeout = (int) $selectTimeout;
+        } else {
+            $this->selectTimeout = 1;
+        }
+        $this->options = $options['options'] ?? [];
+        // unsetting the property forces the first access to go through
+        // __get().
+        unset($this->_mh);
+    }
+    /**
+     * @param string $name
+     *
+     * @return resource|\CurlMultiHandle
+     *
+     * @throws \BadMethodCallException when another field as `_mh` will be gotten
+     * @throws \RuntimeException       when curl can not initialize a multi handle
+     */
+    public function __get($name)
+    {
+        if ($name !== '_mh') {
+            throw new \BadMethodCallException("Can not get other property as '_mh'.");
+        }
+        $multiHandle = \curl_multi_init();
+        if (\false === $multiHandle) {
+            throw new \RuntimeException('Can not initialize curl multi handle.');
+        }
+        $this->_mh = $multiHandle;
+        foreach ($this->options as $option => $value) {
+            // A warning is raised in case of a wrong option.
+            \curl_multi_setopt($this->_mh, $option, $value);
+        }
+        return $this->_mh;
+    }
+    public function __destruct()
+    {
+        if (isset($this->_mh)) {
+            \curl_multi_close($this->_mh);
+            unset($this->_mh);
+        }
+    }
+    public function __invoke(RequestInterface $request, array $options) : PromiseInterface
+    {
+        $easy = $this->factory->create($request, $options);
+        $id = (int) $easy->handle;
+        $promise = new Promise([$this, 'execute'], function () use($id) {
+            return $this->cancel($id);
+        });
+        $this->addRequest(['easy' => $easy, 'deferred' => $promise]);
+        return $promise;
+    }
+    /**
+     * Ticks the curl event loop.
+     */
+    public function tick() : void
+    {
+        // Add any delayed handles if needed.
+        if ($this->delays) {
+            $currentTime = Utils::currentTime();
+            foreach ($this->delays as $id => $delay) {
+                if ($currentTime >= $delay) {
+                    unset($this->delays[$id]);
+                    \curl_multi_add_handle($this->_mh, $this->handles[$id]['easy']->handle);
+                }
+            }
+        }
+        // Step through the task queue which may add additional requests.
+        P\Utils::queue()->run();
+        if ($this->active && \curl_multi_select($this->_mh, $this->selectTimeout) === -1) {
+            // Perform a usleep if a select returns -1.
+            // See: https://bugs.php.net/bug.php?id=61141
+            \usleep(250);
+        }
+        while (\curl_multi_exec($this->_mh, $this->active) === \CURLM_CALL_MULTI_PERFORM) {
+        }
+        $this->processMessages();
+    }
+    /**
+     * Runs until all outstanding connections have completed.
+     */
+    public function execute() : void
+    {
+        $queue = P\Utils::queue();
+        while ($this->handles || !$queue->isEmpty()) {
+            // If there are no transfers, then sleep for the next delay
+            if (!$this->active && $this->delays) {
+                \usleep($this->timeToNext());
+            }
+            $this->tick();
+        }
+    }
+    private function addRequest(array $entry) : void
+    {
+        $easy = $entry['easy'];
+        $id = (int) $easy->handle;
+        $this->handles[$id] = $entry;
+        if (empty($easy->options['delay'])) {
+            \curl_multi_add_handle($this->_mh, $easy->handle);
+        } else {
+            $this->delays[$id] = Utils::currentTime() + $easy->options['delay'] / 1000;
+        }
+    }
+    /**
+     * Cancels a handle from sending and removes references to it.
+     *
+     * @param int $id Handle ID to cancel and remove.
+     *
+     * @return bool True on success, false on failure.
+     */
+    private function cancel($id) : bool
+    {
+        if (!\is_int($id)) {
+            trigger_deprecation('guzzlehttp/guzzle', '7.4', 'Not passing an integer to %s::%s() is deprecated and will cause an error in 8.0.', __CLASS__, __FUNCTION__);
+        }
+        // Cannot cancel if it has been processed.
+        if (!isset($this->handles[$id])) {
+            return \false;
+        }
+        $handle = $this->handles[$id]['easy']->handle;
+        unset($this->delays[$id], $this->handles[$id]);
+        \curl_multi_remove_handle($this->_mh, $handle);
+        \curl_close($handle);
+        return \true;
+    }
+    private function processMessages() : void
+    {
+        while ($done = \curl_multi_info_read($this->_mh)) {
+            if ($done['msg'] !== \CURLMSG_DONE) {
+                // if it's not done, then it would be premature to remove the handle. ref https://github.com/guzzle/guzzle/pull/2892#issuecomment-945150216
+                continue;
+            }
+            $id = (int) $done['handle'];
+            \curl_multi_remove_handle($this->_mh, $done['handle']);
+            if (!isset($this->handles[$id])) {
+                // Probably was cancelled.
+                continue;
+            }
+            $entry = $this->handles[$id];
+            unset($this->handles[$id], $this->delays[$id]);
+            $entry['easy']->errno = $done['result'];
+            $entry['deferred']->resolve(CurlFactory::finish($this, $entry['easy'], $this->factory));
+        }
+    }
+    private function timeToNext() : int
+    {
+        $currentTime = Utils::currentTime();
+        $nextTime = \PHP_INT_MAX;
+        foreach ($this->delays as $time) {
+            if ($time < $nextTime) {
+                $nextTime = $time;
+            }
+        }
+        return (int) \max(0, $nextTime - $currentTime) * 1000000;
+    }
+}

dependencies/guzzlehttp/guzzle/src/Handler/EasyHandle.php

@@ -0,0 +1,91 @@
+<?php
+
+namespace WP_Ultimo\Dependencies\GuzzleHttp\Handler;
+
+use WP_Ultimo\Dependencies\GuzzleHttp\Psr7\Response;
+use WP_Ultimo\Dependencies\GuzzleHttp\Utils;
+use WP_Ultimo\Dependencies\Psr\Http\Message\RequestInterface;
+use WP_Ultimo\Dependencies\Psr\Http\Message\ResponseInterface;
+use WP_Ultimo\Dependencies\Psr\Http\Message\StreamInterface;
+/**
+ * Represents a cURL easy handle and the data it populates.
+ *
+ * @internal
+ */
+final class EasyHandle
+{
+    /**
+     * @var resource|\CurlHandle cURL resource
+     */
+    public $handle;
+    /**
+     * @var StreamInterface Where data is being written
+     */
+    public $sink;
+    /**
+     * @var array Received HTTP headers so far
+     */
+    public $headers = [];
+    /**
+     * @var ResponseInterface|null Received response (if any)
+     */
+    public $response;
+    /**
+     * @var RequestInterface Request being sent
+     */
+    public $request;
+    /**
+     * @var array Request options
+     */
+    public $options = [];
+    /**
+     * @var int cURL error number (if any)
+     */
+    public $errno = 0;
+    /**
+     * @var \Throwable|null Exception during on_headers (if any)
+     */
+    public $onHeadersException;
+    /**
+     * @var \Exception|null Exception during createResponse (if any)
+     */
+    public $createResponseException;
+    /**
+     * Attach a response to the easy handle based on the received headers.
+     *
+     * @throws \RuntimeException if no headers have been received or the first
+     *                           header line is invalid.
+     */
+    public function createResponse() : void
+    {
+        [$ver, $status, $reason, $headers] = HeaderProcessor::parseHeaders($this->headers);
+        $normalizedKeys = Utils::normalizeHeaderKeys($headers);
+        if (!empty($this->options['decode_content']) && isset($normalizedKeys['content-encoding'])) {
+            $headers['x-encoded-content-encoding'] = $headers[$normalizedKeys['content-encoding']];
+            unset($headers[$normalizedKeys['content-encoding']]);
+            if (isset($normalizedKeys['content-length'])) {
+                $headers['x-encoded-content-length'] = $headers[$normalizedKeys['content-length']];
+                $bodyLength = (int) $this->sink->getSize();
+                if ($bodyLength) {
+                    $headers[$normalizedKeys['content-length']] = $bodyLength;
+                } else {
+                    unset($headers[$normalizedKeys['content-length']]);
+                }
+            }
+        }
+        // Attach a response to the easy handle with the parsed headers.
+        $this->response = new Response($status, $headers, $this->sink, $ver, $reason);
+    }
+    /**
+     * @param string $name
+     *
+     * @return void
+     *
+     * @throws \BadMethodCallException
+     */
+    public function __get($name)
+    {
+        $msg = $name === 'handle' ? 'The EasyHandle has been released' : 'Invalid property: ' . $name;
+        throw new \BadMethodCallException($msg);
+    }
+}

dependencies/guzzlehttp/guzzle/src/Handler/HeaderProcessor.php

@@ -0,0 +1,36 @@
+<?php
+
+namespace WP_Ultimo\Dependencies\GuzzleHttp\Handler;
+
+use WP_Ultimo\Dependencies\GuzzleHttp\Utils;
+/**
+ * @internal
+ */
+final class HeaderProcessor
+{
+    /**
+     * Returns the HTTP version, status code, reason phrase, and headers.
+     *
+     * @param string[] $headers
+     *
+     * @return array{0:string, 1:int, 2:?string, 3:array}
+     *
+     * @throws \RuntimeException
+     */
+    public static function parseHeaders(array $headers) : array
+    {
+        if ($headers === []) {
+            throw new \RuntimeException('Expected a non-empty array of header data');
+        }
+        $parts = \explode(' ', \array_shift($headers), 3);
+        $version = \explode('/', $parts[0])[1] ?? null;
+        if ($version === null) {
+            throw new \RuntimeException('HTTP version missing from header data');
+        }
+        $status = $parts[1] ?? null;
+        if ($status === null) {
+            throw new \RuntimeException('HTTP status code missing from header data');
+        }
+        return [$version, (int) $status, $parts[2] ?? null, Utils::headersFromLines($headers)];
+    }
+}

dependencies/guzzlehttp/guzzle/src/Handler/MockHandler.php

@@ -0,0 +1,174 @@
+<?php
+
+namespace WP_Ultimo\Dependencies\GuzzleHttp\Handler;
+
+use WP_Ultimo\Dependencies\GuzzleHttp\Exception\RequestException;
+use WP_Ultimo\Dependencies\GuzzleHttp\HandlerStack;
+use WP_Ultimo\Dependencies\GuzzleHttp\Promise as P;
+use WP_Ultimo\Dependencies\GuzzleHttp\Promise\PromiseInterface;
+use WP_Ultimo\Dependencies\GuzzleHttp\TransferStats;
+use WP_Ultimo\Dependencies\GuzzleHttp\Utils;
+use WP_Ultimo\Dependencies\Psr\Http\Message\RequestInterface;
+use WP_Ultimo\Dependencies\Psr\Http\Message\ResponseInterface;
+use WP_Ultimo\Dependencies\Psr\Http\Message\StreamInterface;
+/**
+ * Handler that returns responses or throw exceptions from a queue.
+ *
+ * @final
+ */
+class MockHandler implements \Countable
+{
+    /**
+     * @var array
+     */
+    private $queue = [];
+    /**
+     * @var RequestInterface|null
+     */
+    private $lastRequest;
+    /**
+     * @var array
+     */
+    private $lastOptions = [];
+    /**
+     * @var callable|null
+     */
+    private $onFulfilled;
+    /**
+     * @var callable|null
+     */
+    private $onRejected;
+    /**
+     * Creates a new MockHandler that uses the default handler stack list of
+     * middlewares.
+     *
+     * @param array|null    $queue       Array of responses, callables, or exceptions.
+     * @param callable|null $onFulfilled Callback to invoke when the return value is fulfilled.
+     * @param callable|null $onRejected  Callback to invoke when the return value is rejected.
+     */
+    public static function createWithMiddleware(array $queue = null, callable $onFulfilled = null, callable $onRejected = null) : HandlerStack
+    {
+        return HandlerStack::create(new self($queue, $onFulfilled, $onRejected));
+    }
+    /**
+     * The passed in value must be an array of
+     * {@see \Psr\Http\Message\ResponseInterface} objects, Exceptions,
+     * callables, or Promises.
+     *
+     * @param array<int, mixed>|null $queue       The parameters to be passed to the append function, as an indexed array.
+     * @param callable|null          $onFulfilled Callback to invoke when the return value is fulfilled.
+     * @param callable|null          $onRejected  Callback to invoke when the return value is rejected.
+     */
+    public function __construct(array $queue = null, callable $onFulfilled = null, callable $onRejected = null)
+    {
+        $this->onFulfilled = $onFulfilled;
+        $this->onRejected = $onRejected;
+        if ($queue) {
+            // array_values included for BC
+            $this->append(...\array_values($queue));
+        }
+    }
+    public function __invoke(RequestInterface $request, array $options) : PromiseInterface
+    {
+        if (!$this->queue) {
+            throw new \OutOfBoundsException('Mock queue is empty');
+        }
+        if (isset($options['delay']) && \is_numeric($options['delay'])) {
+            \usleep((int) $options['delay'] * 1000);
+        }
+        $this->lastRequest = $request;
+        $this->lastOptions = $options;
+        $response = \array_shift($this->queue);
+        if (isset($options['on_headers'])) {
+            if (!\is_callable($options['on_headers'])) {
+                throw new \InvalidArgumentException('on_headers must be callable');
+            }
+            try {
+                $options['on_headers']($response);
+            } catch (\Exception $e) {
+                $msg = 'An error was encountered during the on_headers event';
+                $response = new RequestException($msg, $request, $response, $e);
+            }
+        }
+        if (\is_callable($response)) {
+            $response = $response($request, $options);
+        }
+        $response = $response instanceof \Throwable ? P\Create::rejectionFor($response) : P\Create::promiseFor($response);
+        return $response->then(function (?ResponseInterface $value) use($request, $options) {
+            $this->invokeStats($request, $options, $value);
+            if ($this->onFulfilled) {
+                ($this->onFulfilled)($value);
+            }
+            if ($value !== null && isset($options['sink'])) {
+                $contents = (string) $value->getBody();
+                $sink = $options['sink'];
+                if (\is_resource($sink)) {
+                    \fwrite($sink, $contents);
+                } elseif (\is_string($sink)) {
+                    \file_put_contents($sink, $contents);
+                } elseif ($sink instanceof StreamInterface) {
+                    $sink->write($contents);
+                }
+            }
+            return $value;
+        }, function ($reason) use($request, $options) {
+            $this->invokeStats($request, $options, null, $reason);
+            if ($this->onRejected) {
+                ($this->onRejected)($reason);
+            }
+            return P\Create::rejectionFor($reason);
+        });
+    }
+    /**
+     * Adds one or more variadic requests, exceptions, callables, or promises
+     * to the queue.
+     *
+     * @param mixed ...$values
+     */
+    public function append(...$values) : void
+    {
+        foreach ($values as $value) {
+            if ($value instanceof ResponseInterface || $value instanceof \Throwable || $value instanceof PromiseInterface || \is_callable($value)) {
+                $this->queue[] = $value;
+            } else {
+                throw new \TypeError('Expected a Response, Promise, Throwable or callable. Found ' . Utils::describeType($value));
+            }
+        }
+    }
+    /**
+     * Get the last received request.
+     */
+    public function getLastRequest() : ?RequestInterface
+    {
+        return $this->lastRequest;
+    }
+    /**
+     * Get the last received request options.
+     */
+    public function getLastOptions() : array
+    {
+        return $this->lastOptions;
+    }
+    /**
+     * Returns the number of remaining items in the queue.
+     */
+    public function count() : int
+    {
+        return \count($this->queue);
+    }
+    public function reset() : void
+    {
+        $this->queue = [];
+    }
+    /**
+     * @param mixed $reason Promise or reason.
+     */
+    private function invokeStats(RequestInterface $request, array $options, ResponseInterface $response = null, $reason = null) : void
+    {
+        if (isset($options['on_stats'])) {
+            $transferTime = $options['transfer_time'] ?? 0;
+            $stats = new TransferStats($request, $response, $transferTime, $reason);
+            $options['on_stats']($stats);
+        }
+    }
+}

dependencies/guzzlehttp/guzzle/src/Handler/Proxy.php

@@ -0,0 +1,49 @@
+<?php
+
+namespace WP_Ultimo\Dependencies\GuzzleHttp\Handler;
+
+use WP_Ultimo\Dependencies\GuzzleHttp\Promise\PromiseInterface;
+use WP_Ultimo\Dependencies\GuzzleHttp\RequestOptions;
+use WP_Ultimo\Dependencies\Psr\Http\Message\RequestInterface;
+/**
+ * Provides basic proxies for handlers.
+ *
+ * @final
+ */
+class Proxy
+{
+    /**
+     * Sends synchronous requests to a specific handler while sending all other
+     * requests to another handler.
+     *
+     * @param callable(\Psr\Http\Message\RequestInterface, array): \GuzzleHttp\Promise\PromiseInterface $default Handler used for normal responses
+     * @param callable(\Psr\Http\Message\RequestInterface, array): \GuzzleHttp\Promise\PromiseInterface $sync    Handler used for synchronous responses.
+     *
+     * @return callable(\Psr\Http\Message\RequestInterface, array): \GuzzleHttp\Promise\PromiseInterface Returns the composed handler.
+     */
+    public static function wrapSync(callable $default, callable $sync) : callable
+    {
+        return static function (RequestInterface $request, array $options) use($default, $sync) : PromiseInterface {
+            return empty($options[RequestOptions::SYNCHRONOUS]) ? $default($request, $options) : $sync($request, $options);
+        };
+    }
+    /**
+     * Sends streaming requests to a streaming compatible handler while sending
+     * all other requests to a default handler.
+     *
+     * This, for example, could be useful for taking advantage of the
+     * performance benefits of curl while still supporting true streaming
+     * through the StreamHandler.
+     *
+     * @param callable(\Psr\Http\Message\RequestInterface, array): \GuzzleHttp\Promise\PromiseInterface $default   Handler used for non-streaming responses
+     * @param callable(\Psr\Http\Message\RequestInterface, array): \GuzzleHttp\Promise\PromiseInterface $streaming Handler used for streaming responses
+     *
+     * @return callable(\Psr\Http\Message\RequestInterface, array): \GuzzleHttp\Promise\PromiseInterface Returns the composed handler.
+     */
+    public static function wrapStreaming(callable $default, callable $streaming) : callable
+    {
+        return static function (RequestInterface $request, array $options) use($default, $streaming) : PromiseInterface {
+            return empty($options['stream']) ? $default($request, $options) : $streaming($request, $options);
+        };
+    }
+}

dependencies/guzzlehttp/guzzle/src/Handler/StreamHandler.php

@@ -0,0 +1,455 @@
+<?php
+
+namespace WP_Ultimo\Dependencies\GuzzleHttp\Handler;
+
+use WP_Ultimo\Dependencies\GuzzleHttp\Exception\ConnectException;
+use WP_Ultimo\Dependencies\GuzzleHttp\Exception\RequestException;
+use WP_Ultimo\Dependencies\GuzzleHttp\Promise as P;
+use WP_Ultimo\Dependencies\GuzzleHttp\Promise\FulfilledPromise;
+use WP_Ultimo\Dependencies\GuzzleHttp\Promise\PromiseInterface;
+use WP_Ultimo\Dependencies\GuzzleHttp\Psr7;
+use WP_Ultimo\Dependencies\GuzzleHttp\TransferStats;
+use WP_Ultimo\Dependencies\GuzzleHttp\Utils;
+use WP_Ultimo\Dependencies\Psr\Http\Message\RequestInterface;
+use WP_Ultimo\Dependencies\Psr\Http\Message\ResponseInterface;
+use WP_Ultimo\Dependencies\Psr\Http\Message\StreamInterface;
+use WP_Ultimo\Dependencies\Psr\Http\Message\UriInterface;
+/**
+ * HTTP handler that uses PHP's HTTP stream wrapper.
+ *
+ * @final
+ */
+class StreamHandler
+{
+    /**
+     * @var array
+     */
+    private $lastHeaders = [];
+    /**
+     * Sends an HTTP request.
+     *
+     * @param RequestInterface $request Request to send.
+     * @param array            $options Request transfer options.
+     */
+    public function __invoke(RequestInterface $request, array $options) : PromiseInterface
+    {
+        // Sleep if there is a delay specified.
+        if (isset($options['delay'])) {
+            \usleep($options['delay'] * 1000);
+        }
+        $startTime = isset($options['on_stats']) ? Utils::currentTime() : null;
+        try {
+            // Does not support the expect header.
+            $request = $request->withoutHeader('Expect');
+            // Append a content-length header if body size is zero to match
+            // cURL's behavior.
+            if (0 === $request->getBody()->getSize()) {
+                $request = $request->withHeader('Content-Length', '0');
+            }
+            return $this->createResponse($request, $options, $this->createStream($request, $options), $startTime);
+        } catch (\InvalidArgumentException $e) {
+            throw $e;
+        } catch (\Exception $e) {
+            // Determine if the error was a networking error.
+            $message = $e->getMessage();
+            // This list can probably get more comprehensive.
+            if (\false !== \strpos($message, 'getaddrinfo') || \false !== \strpos($message, 'Connection refused') || \false !== \strpos($message, "couldn't connect to host") || \false !== \strpos($message, 'connection attempt failed')) {
+                $e = new ConnectException($e->getMessage(), $request, $e);
+            } else {
+                $e = RequestException::wrapException($request, $e);
+            }
+            $this->invokeStats($options, $request, $startTime, null, $e);
+            return P\Create::rejectionFor($e);
+        }
+    }
+    private function invokeStats(array $options, RequestInterface $request, ?float $startTime, ResponseInterface $response = null, \Throwable $error = null) : void
+    {
+        if (isset($options['on_stats'])) {
+            $stats = new TransferStats($request, $response, Utils::currentTime() - $startTime, $error, []);
+            $options['on_stats']($stats);
+        }
+    }
+    /**
+     * @param resource $stream
+     */
+    private function createResponse(RequestInterface $request, array $options, $stream, ?float $startTime) : PromiseInterface
+    {
+        $hdrs = $this->lastHeaders;
+        $this->lastHeaders = [];
+        try {
+            [$ver, $status, $reason, $headers] = HeaderProcessor::parseHeaders($hdrs);
+        } catch (\Exception $e) {
+            return P\Create::rejectionFor(new RequestException('An error was encountered while creating the response', $request, null, $e));
+        }
+        [$stream, $headers] = $this->checkDecode($options, $headers, $stream);
+        $stream = Psr7\Utils::streamFor($stream);
+        $sink = $stream;
+        if (\strcasecmp('HEAD', $request->getMethod())) {
+            $sink = $this->createSink($stream, $options);
+        }
+        try {
+            $response = new Psr7\Response($status, $headers, $sink, $ver, $reason);
+        } catch (\Exception $e) {
+            return P\Create::rejectionFor(new RequestException('An error was encountered while creating the response', $request, null, $e));
+        }
+        if (isset($options['on_headers'])) {
+            try {
+                $options['on_headers']($response);
+            } catch (\Exception $e) {
+                return P\Create::rejectionFor(new RequestException('An error was encountered during the on_headers event', $request, $response, $e));
+            }
+        }
+        // Do not drain when the request is a HEAD request because they have
+        // no body.
+        if ($sink !== $stream) {
+            $this->drain($stream, $sink, $response->getHeaderLine('Content-Length'));
+        }
+        $this->invokeStats($options, $request, $startTime, $response, null);
+        return new FulfilledPromise($response);
+    }
+    private function createSink(StreamInterface $stream, array $options) : StreamInterface
+    {
+        if (!empty($options['stream'])) {
+            return $stream;
+        }
+        $sink = $options['sink'] ?? Psr7\Utils::tryFopen('php://temp', 'r+');
+        return \is_string($sink) ? new Psr7\LazyOpenStream($sink, 'w+') : Psr7\Utils::streamFor($sink);
+    }
+    /**
+     * @param resource $stream
+     */
+    private function checkDecode(array $options, array $headers, $stream) : array
+    {
+        // Automatically decode responses when instructed.
+        if (!empty($options['decode_content'])) {
+            $normalizedKeys = Utils::normalizeHeaderKeys($headers);
+            if (isset($normalizedKeys['content-encoding'])) {
+                $encoding = $headers[$normalizedKeys['content-encoding']];
+                if ($encoding[0] === 'gzip' || $encoding[0] === 'deflate') {
+                    $stream = new Psr7\InflateStream(Psr7\Utils::streamFor($stream));
+                    $headers['x-encoded-content-encoding'] = $headers[$normalizedKeys['content-encoding']];
+                    // Remove content-encoding header
+                    unset($headers[$normalizedKeys['content-encoding']]);
+                    // Fix content-length header
+                    if (isset($normalizedKeys['content-length'])) {
+                        $headers['x-encoded-content-length'] = $headers[$normalizedKeys['content-length']];
+                        $length = (int) $stream->getSize();
+                        if ($length === 0) {
+                            unset($headers[$normalizedKeys['content-length']]);
+                        } else {
+                            $headers[$normalizedKeys['content-length']] = [$length];
+                        }
+                    }
+                }
+            }
+        }
+        return [$stream, $headers];
+    }
+    /**
+     * Drains the source stream into the "sink" client option.
+     *
+     * @param string $contentLength Header specifying the amount of
+     *                              data to read.
+     *
+     * @throws \RuntimeException when the sink option is invalid.
+     */
+    private function drain(StreamInterface $source, StreamInterface $sink, string $contentLength) : StreamInterface
+    {
+        // If a content-length header is provided, then stop reading once
+        // that number of bytes has been read. This can prevent infinitely
+        // reading from a stream when dealing with servers that do not honor
+        // Connection: Close headers.
+        Psr7\Utils::copyToStream($source, $sink, \strlen($contentLength) > 0 && (int) $contentLength > 0 ? (int) $contentLength : -1);
+        $sink->seek(0);
+        $source->close();
+        return $sink;
+    }
+    /**
+     * Create a resource and check to ensure it was created successfully
+     *
+     * @param callable $callback Callable that returns stream resource
+     *
+     * @return resource
+     *
+     * @throws \RuntimeException on error
+     */
+    private function createResource(callable $callback)
+    {
+        $errors = [];
+        \set_error_handler(static function ($_, $msg, $file, $line) use(&$errors) : bool {
+            $errors[] = ['message' => $msg, 'file' => $file, 'line' => $line];
+            return \true;
+        });
+        try {
+            $resource = $callback();
+        } finally {
+            \restore_error_handler();
+        }
+        if (!$resource) {
+            $message = 'Error creating resource: ';
+            foreach ($errors as $err) {
+                foreach ($err as $key => $value) {
+                    $message .= "[{$key}] {$value}" . \PHP_EOL;
+                }
+            }
+            throw new \RuntimeException(\trim($message));
+        }
+        return $resource;
+    }
+    /**
+     * @return resource
+     */
+    private function createStream(RequestInterface $request, array $options)
+    {
+        static $methods;
+        if (!$methods) {
+            $methods = \array_flip(\get_class_methods(__CLASS__));
+        }
+        if (!\in_array($request->getUri()->getScheme(), ['http', 'https'])) {
+            throw new RequestException(\sprintf("The scheme '%s' is not supported.", $request->getUri()->getScheme()), $request);
+        }
+        // HTTP/1.1 streams using the PHP stream wrapper require a
+        // Connection: close header
+        if ($request->getProtocolVersion() == '1.1' && !$request->hasHeader('Connection')) {
+            $request = $request->withHeader('Connection', 'close');
+        }
+        // Ensure SSL is verified by default
+        if (!isset($options['verify'])) {
+            $options['verify'] = \true;
+        }
+        $params = [];
+        $context = $this->getDefaultContext($request);
+        if (isset($options['on_headers']) && !\is_callable($options['on_headers'])) {
+            throw new \InvalidArgumentException('on_headers must be callable');
+        }
+        if (!empty($options)) {
+            foreach ($options as $key => $value) {
+                $method = "add_{$key}";
+                if (isset($methods[$method])) {
+                    $this->{$method}($request, $context, $value, $params);
+                }
+            }
+        }
+        if (isset($options['stream_context'])) {
+            if (!\is_array($options['stream_context'])) {
+                throw new \InvalidArgumentException('stream_context must be an array');
+            }
+            $context = \array_replace_recursive($context, $options['stream_context']);
+        }
+        // Microsoft NTLM authentication only supported with curl handler
+        if (isset($options['auth'][2]) && 'ntlm' === $options['auth'][2]) {
+            throw new \InvalidArgumentException('Microsoft NTLM authentication only supported with curl handler');
+        }
+        $uri = $this->resolveHost($request, $options);
+        $contextResource = $this->createResource(static function () use($context, $params) {
+            return \stream_context_create($context, $params);
+        });
+        return $this->createResource(function () use($uri, &$http_response_header, $contextResource, $context, $options, $request) {
+            $resource = @\fopen((string) $uri, 'r', \false, $contextResource);
+            $this->lastHeaders = $http_response_header ?? [];
+            if (\false === $resource) {
+                throw new ConnectException(\sprintf('Connection refused for URI %s', $uri), $request, null, $context);
+            }
+            if (isset($options['read_timeout'])) {
+                $readTimeout = $options['read_timeout'];
+                $sec = (int) $readTimeout;
+                $usec = ($readTimeout - $sec) * 100000;
+                \stream_set_timeout($resource, $sec, $usec);
+            }
+            return $resource;
+        });
+    }
+    private function resolveHost(RequestInterface $request, array $options) : UriInterface
+    {
+        $uri = $request->getUri();
+        if (isset($options['force_ip_resolve']) && !\filter_var($uri->getHost(), \FILTER_VALIDATE_IP)) {
+            if ('v4' === $options['force_ip_resolve']) {
+                $records = \dns_get_record($uri->getHost(), \DNS_A);
+                if (\false === $records || !isset($records[0]['ip'])) {
+                    throw new ConnectException(\sprintf("Could not resolve IPv4 address for host '%s'", $uri->getHost()), $request);
+                }
+                return $uri->withHost($records[0]['ip']);
+            }
+            if ('v6' === $options['force_ip_resolve']) {
+                $records = \dns_get_record($uri->getHost(), \DNS_AAAA);
+                if (\false === $records || !isset($records[0]['ipv6'])) {
+                    throw new ConnectException(\sprintf("Could not resolve IPv6 address for host '%s'", $uri->getHost()), $request);
+                }
+                return $uri->withHost('[' . $records[0]['ipv6'] . ']');
+            }
+        }
+        return $uri;
+    }
+    private function getDefaultContext(RequestInterface $request) : array
+    {
+        $headers = '';
+        foreach ($request->getHeaders() as $name => $value) {
+            foreach ($value as $val) {
+                $headers .= "{$name}: {$val}\r\n";
+            }
+        }
+        $context = ['http' => ['method' => $request->getMethod(), 'header' => $headers, 'protocol_version' => $request->getProtocolVersion(), 'ignore_errors' => \true, 'follow_location' => 0], 'ssl' => ['peer_name' => $request->getUri()->getHost()]];
+        $body = (string) $request->getBody();
+        if ('' !== $body) {
+            $context['http']['content'] = $body;
+            // Prevent the HTTP handler from adding a Content-Type header.
+            if (!$request->hasHeader('Content-Type')) {
+                $context['http']['header'] .= "Content-Type:\r\n";
+            }
+        }
+        $context['http']['header'] = \rtrim($context['http']['header']);
+        return $context;
+    }
+    /**
+     * @param mixed $value as passed via Request transfer options.
+     */
+    private function add_proxy(RequestInterface $request, array &$options, $value, array &$params) : void
+    {
+        $uri = null;
+        if (!\is_array($value)) {
+            $uri = $value;
+        } else {
+            $scheme = $request->getUri()->getScheme();
+            if (isset($value[$scheme])) {
+                if (!isset($value['no']) || !Utils::isHostInNoProxy($request->getUri()->getHost(), $value['no'])) {
+                    $uri = $value[$scheme];
+                }
+            }
+        }
+        if (!$uri) {
+            return;
+        }
+        $parsed = $this->parse_proxy($uri);
+        $options['http']['proxy'] = $parsed['proxy'];
+        if ($parsed['auth']) {
+            if (!isset($options['http']['header'])) {
+                $options['http']['header'] = [];
+            }
+            $options['http']['header'] .= "\r\nProxy-Authorization: {$parsed['auth']}";
+        }
+    }
+    /**
+     * Parses the given proxy URL to make it compatible with the format PHP's stream context expects.
+     */
+    private function parse_proxy(string $url) : array
+    {
+        $parsed = \parse_url($url);
+        if ($parsed !== \false && isset($parsed['scheme']) && $parsed['scheme'] === 'http') {
+            if (isset($parsed['host']) && isset($parsed['port'])) {
+                $auth = null;
+                if (isset($parsed['user']) && isset($parsed['pass'])) {
+                    $auth = \base64_encode("{$parsed['user']}:{$parsed['pass']}");
+                }
+                return ['proxy' => "tcp://{$parsed['host']}:{$parsed['port']}", 'auth' => $auth ? "Basic {$auth}" : null];
+            }
+        }
+        // Return proxy as-is.
+        return ['proxy' => $url, 'auth' => null];
+    }
+    /**
+     * @param mixed $value as passed via Request transfer options.
+     */
+    private function add_timeout(RequestInterface $request, array &$options, $value, array &$params) : void
+    {
+        if ($value > 0) {
+            $options['http']['timeout'] = $value;
+        }
+    }
+    /**
+     * @param mixed $value as passed via Request transfer options.
+     */
+    private function add_crypto_method(RequestInterface $request, array &$options, $value, array &$params) : void
+    {
+        if ($value === \STREAM_CRYPTO_METHOD_TLSv1_0_CLIENT || $value === \STREAM_CRYPTO_METHOD_TLSv1_1_CLIENT || $value === \STREAM_CRYPTO_METHOD_TLSv1_2_CLIENT || \defined('STREAM_CRYPTO_METHOD_TLSv1_3_CLIENT') && $value === \STREAM_CRYPTO_METHOD_TLSv1_3_CLIENT) {
+            $options['http']['crypto_method'] = $value;
+            return;
+        }
+        throw new \InvalidArgumentException('Invalid crypto_method request option: unknown version provided');
+    }
+    /**
+     * @param mixed $value as passed via Request transfer options.
+     */
+    private function add_verify(RequestInterface $request, array &$options, $value, array &$params) : void
+    {
+        if ($value === \false) {
+            $options['ssl']['verify_peer'] = \false;
+            $options['ssl']['verify_peer_name'] = \false;
+            return;
+        }
+        if (\is_string($value)) {
+            $options['ssl']['cafile'] = $value;
+            if (!\file_exists($value)) {
+                throw new \RuntimeException("SSL CA bundle not found: {$value}");
+            }
+        } elseif ($value !== \true) {
+            throw new \InvalidArgumentException('Invalid verify request option');
+        }
+        $options['ssl']['verify_peer'] = \true;
+        $options['ssl']['verify_peer_name'] = \true;
+        $options['ssl']['allow_self_signed'] = \false;
+    }
+    /**
+     * @param mixed $value as passed via Request transfer options.
+     */
+    private function add_cert(RequestInterface $request, array &$options, $value, array &$params) : void
+    {
+        if (\is_array($value)) {
+            $options['ssl']['passphrase'] = $value[1];
+            $value = $value[0];
+        }
+        if (!\file_exists($value)) {
+            throw new \RuntimeException("SSL certificate not found: {$value}");
+        }
+        $options['ssl']['local_cert'] = $value;
+    }
+    /**
+     * @param mixed $value as passed via Request transfer options.
+     */
+    private function add_progress(RequestInterface $request, array &$options, $value, array &$params) : void
+    {
+        self::addNotification($params, static function ($code, $a, $b, $c, $transferred, $total) use($value) {
+            if ($code == \STREAM_NOTIFY_PROGRESS) {
+                // The upload progress cannot be determined. Use 0 for cURL compatibility:
+                // https://curl.se/libcurl/c/CURLOPT_PROGRESSFUNCTION.html
+                $value($total, $transferred, 0, 0);
+            }
+        });
+    }
+    /**
+     * @param mixed $value as passed via Request transfer options.
+     */
+    private function add_debug(RequestInterface $request, array &$options, $value, array &$params) : void
+    {
+        if ($value === \false) {
+            return;
+        }
+        static $map = [\STREAM_NOTIFY_CONNECT => 'CONNECT', \STREAM_NOTIFY_AUTH_REQUIRED => 'AUTH_REQUIRED', \STREAM_NOTIFY_AUTH_RESULT => 'AUTH_RESULT', \STREAM_NOTIFY_MIME_TYPE_IS => 'MIME_TYPE_IS', \STREAM_NOTIFY_FILE_SIZE_IS => 'FILE_SIZE_IS', \STREAM_NOTIFY_REDIRECTED => 'REDIRECTED', \STREAM_NOTIFY_PROGRESS => 'PROGRESS', \STREAM_NOTIFY_FAILURE => 'FAILURE', \STREAM_NOTIFY_COMPLETED => 'COMPLETED', \STREAM_NOTIFY_RESOLVE => 'RESOLVE'];
+        static $args = ['severity', 'message', 'message_code', 'bytes_transferred', 'bytes_max'];
+        $value = Utils::debugResource($value);
+        $ident = $request->getMethod() . ' ' . $request->getUri()->withFragment('');
+        self::addNotification($params, static function (int $code, ...$passed) use($ident, $value, $map, $args) : void {
+            \fprintf($value, '<%s> [%s] ', $ident, $map[$code]);
+            foreach (\array_filter($passed) as $i => $v) {
+                \fwrite($value, $args[$i] . ': "' . $v . '" ');
+            }
+            \fwrite($value, "\n");
+        });
+    }
+    private static function addNotification(array &$params, callable $notify) : void
+    {
+        // Wrap the existing function if needed.
+        if (!isset($params['notification'])) {
+            $params['notification'] = $notify;
+        } else {
+            $params['notification'] = self::callArray([$params['notification'], $notify]);
+        }
+    }
+    private static function callArray(array $functions) : callable
+    {
+        return static function (...$args) use($functions) {
+            foreach ($functions as $fn) {
+                $fn(...$args);
+            }
+        };
+    }
+}

dependencies/guzzlehttp/guzzle/src/HandlerStack.php

@@ -0,0 +1,238 @@
+<?php
+
+namespace WP_Ultimo\Dependencies\GuzzleHttp;
+
+use WP_Ultimo\Dependencies\GuzzleHttp\Promise\PromiseInterface;
+use WP_Ultimo\Dependencies\Psr\Http\Message\RequestInterface;
+use WP_Ultimo\Dependencies\Psr\Http\Message\ResponseInterface;
+/**
+ * Creates a composed Guzzle handler function by stacking middlewares on top of
+ * an HTTP handler function.
+ *
+ * @final
+ */
+class HandlerStack
+{
+    /**
+     * @var (callable(RequestInterface, array): PromiseInterface)|null
+     */
+    private $handler;
+    /**
+     * @var array{(callable(callable(RequestInterface, array): PromiseInterface): callable), (string|null)}[]
+     */
+    private $stack = [];
+    /**
+     * @var (callable(RequestInterface, array): PromiseInterface)|null
+     */
+    private $cached;
+    /**
+     * Creates a default handler stack that can be used by clients.
+     *
+     * The returned handler will wrap the provided handler or use the most
+     * appropriate default handler for your system. The returned HandlerStack has
+     * support for cookies, redirects, HTTP error exceptions, and preparing a body
+     * before sending.
+     *
+     * The returned handler stack can be passed to a client in the "handler"
+     * option.
+     *
+     * @param (callable(RequestInterface, array): PromiseInterface)|null $handler HTTP handler function to use with the stack. If no
+     *                                                                            handler is provided, the best handler for your
+     *                                                                            system will be utilized.
+     */
+    public static function create(callable $handler = null) : self
+    {
+        $stack = new self($handler ?: Utils::chooseHandler());
+        $stack->push(Middleware::httpErrors(), 'http_errors');
+        $stack->push(Middleware::redirect(), 'allow_redirects');
+        $stack->push(Middleware::cookies(), 'cookies');
+        $stack->push(Middleware::prepareBody(), 'prepare_body');
+        return $stack;
+    }
+    /**
+     * @param (callable(RequestInterface, array): PromiseInterface)|null $handler Underlying HTTP handler.
+     */
+    public function __construct(callable $handler = null)
+    {
+        $this->handler = $handler;
+    }
+    /**
+     * Invokes the handler stack as a composed handler
+     *
+     * @return ResponseInterface|PromiseInterface
+     */
+    public function __invoke(RequestInterface $request, array $options)
+    {
+        $handler = $this->resolve();
+        return $handler($request, $options);
+    }
+    /**
+     * Dumps a string representation of the stack.
+     *
+     * @return string
+     */
+    public function __toString()
+    {
+        $depth = 0;
+        $stack = [];
+        if ($this->handler !== null) {
+            $stack[] = '0) Handler: ' . $this->debugCallable($this->handler);
+        }
+        $result = '';
+        foreach (\array_reverse($this->stack) as $tuple) {
+            ++$depth;
+            $str = "{$depth}) Name: '{$tuple[1]}', ";
+            $str .= 'Function: ' . $this->debugCallable($tuple[0]);
+            $result = "> {$str}\n{$result}";
+            $stack[] = $str;
+        }
+        foreach (\array_keys($stack) as $k) {
+            $result .= "< {$stack[$k]}\n";
+        }
+        return $result;
+    }
+    /**
+     * Set the HTTP handler that actually returns a promise.
+     *
+     * @param callable(RequestInterface, array): PromiseInterface $handler Accepts a request and array of options and
+     *                                                                     returns a Promise.
+     */
+    public function setHandler(callable $handler) : void
+    {
+        $this->handler = $handler;
+        $this->cached = null;
+    }
+    /**
+     * Returns true if the builder has a handler.
+     */
+    public function hasHandler() : bool
+    {
+        return $this->handler !== null;
+    }
+    /**
+     * Unshift a middleware to the bottom of the stack.
+     *
+     * @param callable(callable): callable $middleware Middleware function
+     * @param string                       $name       Name to register for this middleware.
+     */
+    public function unshift(callable $middleware, string $name = null) : void
+    {
+        \array_unshift($this->stack, [$middleware, $name]);
+        $this->cached = null;
+    }
+    /**
+     * Push a middleware to the top of the stack.
+     *
+     * @param callable(callable): callable $middleware Middleware function
+     * @param string                       $name       Name to register for this middleware.
+     */
+    public function push(callable $middleware, string $name = '') : void
+    {
+        $this->stack[] = [$middleware, $name];
+        $this->cached = null;
+    }
+    /**
+     * Add a middleware before another middleware by name.
+     *
+     * @param string                       $findName   Middleware to find
+     * @param callable(callable): callable $middleware Middleware function
+     * @param string                       $withName   Name to register for this middleware.
+     */
+    public function before(string $findName, callable $middleware, string $withName = '') : void
+    {
+        $this->splice($findName, $withName, $middleware, \true);
+    }
+    /**
+     * Add a middleware after another middleware by name.
+     *
+     * @param string                       $findName   Middleware to find
+     * @param callable(callable): callable $middleware Middleware function
+     * @param string                       $withName   Name to register for this middleware.
+     */
+    public function after(string $findName, callable $middleware, string $withName = '') : void
+    {
+        $this->splice($findName, $withName, $middleware, \false);
+    }
+    /**
+     * Remove a middleware by instance or name from the stack.
+     *
+     * @param callable|string $remove Middleware to remove by instance or name.
+     */
+    public function remove($remove) : void
+    {
+        if (!\is_string($remove) && !\is_callable($remove)) {
+            trigger_deprecation('guzzlehttp/guzzle', '7.4', 'Not passing a callable or string to %s::%s() is deprecated and will cause an error in 8.0.', __CLASS__, __FUNCTION__);
+        }
+        $this->cached = null;
+        $idx = \is_callable($remove) ? 0 : 1;
+        $this->stack = \array_values(\array_filter($this->stack, static function ($tuple) use($idx, $remove) {
+            return $tuple[$idx] !== $remove;
+        }));
+    }
+    /**
+     * Compose the middleware and handler into a single callable function.
+     *
+     * @return callable(RequestInterface, array): PromiseInterface
+     */
+    public function resolve() : callable
+    {
+        if ($this->cached === null) {
+            if (($prev = $this->handler) === null) {
+                throw new \LogicException('No handler has been specified');
+            }
+            foreach (\array_reverse($this->stack) as $fn) {
+                /** @var callable(RequestInterface, array): PromiseInterface $prev */
+                $prev = $fn[0]($prev);
+            }
+            $this->cached = $prev;
+        }
+        return $this->cached;
+    }
+    private function findByName(string $name) : int
+    {
+        foreach ($this->stack as $k => $v) {
+            if ($v[1] === $name) {
+                return $k;
+            }
+        }
+        throw new \InvalidArgumentException("Middleware not found: {$name}");
+    }
+    /**
+     * Splices a function into the middleware list at a specific position.
+     */
+    private function splice(string $findName, string $withName, callable $middleware, bool $before) : void
+    {
+        $this->cached = null;
+        $idx = $this->findByName($findName);
+        $tuple = [$middleware, $withName];
+        if ($before) {
+            if ($idx === 0) {
+                \array_unshift($this->stack, $tuple);
+            } else {
+                $replacement = [$tuple, $this->stack[$idx]];
+                \array_splice($this->stack, $idx, 1, $replacement);
+            }
+        } elseif ($idx === \count($this->stack) - 1) {
+            $this->stack[] = $tuple;
+        } else {
+            $replacement = [$this->stack[$idx], $tuple];
+            \array_splice($this->stack, $idx, 1, $replacement);
+        }
+    }
+    /**
+     * Provides a debug string for a given callable.
+     *
+     * @param callable|string $fn Function to write as a string.
+     */
+    private function debugCallable($fn) : string
+    {
+        if (\is_string($fn)) {
+            return "callable({$fn})";
+        }
+        if (\is_array($fn)) {
+            return \is_string($fn[0]) ? "callable({$fn[0]}::{$fn[1]})" : "callable(['" . \get_class($fn[0]) . "', '{$fn[1]}'])";
+        }
+        /** @var object $fn */
+        return 'callable(' . \spl_object_hash($fn) . ')';
+    }
+}

dependencies/guzzlehttp/guzzle/src/MessageFormatter.php

@@ -0,0 +1,168 @@
+<?php
+
+namespace WP_Ultimo\Dependencies\GuzzleHttp;
+
+use WP_Ultimo\Dependencies\Psr\Http\Message\MessageInterface;
+use WP_Ultimo\Dependencies\Psr\Http\Message\RequestInterface;
+use WP_Ultimo\Dependencies\Psr\Http\Message\ResponseInterface;
+/**
+ * Formats log messages using variable substitutions for requests, responses,
+ * and other transactional data.
+ *
+ * The following variable substitutions are supported:
+ *
+ * - {request}:        Full HTTP request message
+ * - {response}:       Full HTTP response message
+ * - {ts}:             ISO 8601 date in GMT
+ * - {date_iso_8601}   ISO 8601 date in GMT
+ * - {date_common_log} Apache common log date using the configured timezone.
+ * - {host}:           Host of the request
+ * - {method}:         Method of the request
+ * - {uri}:            URI of the request
+ * - {version}:        Protocol version
+ * - {target}:         Request target of the request (path + query + fragment)
+ * - {hostname}:       Hostname of the machine that sent the request
+ * - {code}:           Status code of the response (if available)
+ * - {phrase}:         Reason phrase of the response  (if available)
+ * - {error}:          Any error messages (if available)
+ * - {req_header_*}:   Replace `*` with the lowercased name of a request header to add to the message
+ * - {res_header_*}:   Replace `*` with the lowercased name of a response header to add to the message
+ * - {req_headers}:    Request headers
+ * - {res_headers}:    Response headers
+ * - {req_body}:       Request body
+ * - {res_body}:       Response body
+ *
+ * @final
+ */
+class MessageFormatter implements MessageFormatterInterface
+{
+    /**
+     * Apache Common Log Format.
+     *
+     * @see https://httpd.apache.org/docs/2.4/logs.html#common
+     *
+     * @var string
+     */
+    public const CLF = '{hostname} {req_header_User-Agent} - [{date_common_log}] "{method} {target} HTTP/{version}" {code} {res_header_Content-Length}';
+    public const DEBUG = ">>>>>>>>\n{request}\n<<<<<<<<\n{response}\n--------\n{error}";
+    public const SHORT = '[{ts}] "{method} {target} HTTP/{version}" {code}';
+    /**
+     * @var string Template used to format log messages
+     */
+    private $template;
+    /**
+     * @param string $template Log message template
+     */
+    public function __construct(?string $template = self::CLF)
+    {
+        $this->template = $template ?: self::CLF;
+    }
+    /**
+     * Returns a formatted message string.
+     *
+     * @param RequestInterface       $request  Request that was sent
+     * @param ResponseInterface|null $response Response that was received
+     * @param \Throwable|null        $error    Exception that was received
+     */
+    public function format(RequestInterface $request, ResponseInterface $response = null, \Throwable $error = null) : string
+    {
+        $cache = [];
+        /** @var string */
+        return \preg_replace_callback('/{\\s*([A-Za-z_\\-\\.0-9]+)\\s*}/', function (array $matches) use($request, $response, $error, &$cache) {
+            if (isset($cache[$matches[1]])) {
+                return $cache[$matches[1]];
+            }
+            $result = '';
+            switch ($matches[1]) {
+                case 'request':
+                    $result = Psr7\Message::toString($request);
+                    break;
+                case 'response':
+                    $result = $response ? Psr7\Message::toString($response) : '';
+                    break;
+                case 'req_headers':
+                    $result = \trim($request->getMethod() . ' ' . $request->getRequestTarget()) . ' HTTP/' . $request->getProtocolVersion() . "\r\n" . $this->headers($request);
+                    break;
+                case 'res_headers':
+                    $result = $response ? \sprintf('HTTP/%s %d %s', $response->getProtocolVersion(), $response->getStatusCode(), $response->getReasonPhrase()) . "\r\n" . $this->headers($response) : 'NULL';
+                    break;
+                case 'req_body':
+                    $result = $request->getBody()->__toString();
+                    break;
+                case 'res_body':
+                    if (!$response instanceof ResponseInterface) {
+                        $result = 'NULL';
+                        break;
+                    }
+                    $body = $response->getBody();
+                    if (!$body->isSeekable()) {
+                        $result = 'RESPONSE_NOT_LOGGEABLE';
+                        break;
+                    }
+                    $result = $response->getBody()->__toString();
+                    break;
+                case 'ts':
+                case 'date_iso_8601':
+                    $result = \gmdate('c');
+                    break;
+                case 'date_common_log':
+                    $result = \date('d/M/Y:H:i:s O');
+                    break;
+                case 'method':
+                    $result = $request->getMethod();
+                    break;
+                case 'version':
+                    $result = $request->getProtocolVersion();
+                    break;
+                case 'uri':
+                case 'url':
+                    $result = $request->getUri()->__toString();
+                    break;
+                case 'target':
+                    $result = $request->getRequestTarget();
+                    break;
+                case 'req_version':
+                    $result = $request->getProtocolVersion();
+                    break;
+                case 'res_version':
+                    $result = $response ? $response->getProtocolVersion() : 'NULL';
+                    break;
+                case 'host':
+                    $result = $request->getHeaderLine('Host');
+                    break;
+                case 'hostname':
+                    $result = \gethostname();
+                    break;
+                case 'code':
+                    $result = $response ? $response->getStatusCode() : 'NULL';
+                    break;
+                case 'phrase':
+                    $result = $response ? $response->getReasonPhrase() : 'NULL';
+                    break;
+                case 'error':
+                    $result = $error ? $error->getMessage() : 'NULL';
+                    break;
+                default:
+                    // handle prefixed dynamic headers
+                    if (\strpos($matches[1], 'req_header_') === 0) {
+                        $result = $request->getHeaderLine(\substr($matches[1], 11));
+                    } elseif (\strpos($matches[1], 'res_header_') === 0) {
+                        $result = $response ? $response->getHeaderLine(\substr($matches[1], 11)) : 'NULL';
+                    }
+            }
+            $cache[$matches[1]] = $result;
+            return $result;
+        }, $this->template);
+    }
+    /**
+     * Get headers from message as string
+     */
+    private function headers(MessageInterface $message) : string
+    {
+        $result = '';
+        foreach ($message->getHeaders() as $name => $values) {
+            $result .= $name . ': ' . \implode(', ', $values) . "\r\n";
+        }
+        return \trim($result);
+    }
+}

dependencies/guzzlehttp/guzzle/src/MessageFormatterInterface.php

@@ -0,0 +1,17 @@
+<?php
+
+namespace WP_Ultimo\Dependencies\GuzzleHttp;
+
+use WP_Ultimo\Dependencies\Psr\Http\Message\RequestInterface;
+use WP_Ultimo\Dependencies\Psr\Http\Message\ResponseInterface;
+interface MessageFormatterInterface
+{
+    /**
+     * Returns a formatted message string.
+     *
+     * @param RequestInterface       $request  Request that was sent
+     * @param ResponseInterface|null $response Response that was received
+     * @param \Throwable|null        $error    Exception that was received
+     */
+    public function format(RequestInterface $request, ResponseInterface $response = null, \Throwable $error = null) : string;
+}

dependencies/guzzlehttp/guzzle/src/Middleware.php

@@ -0,0 +1,227 @@
+<?php
+
+namespace WP_Ultimo\Dependencies\GuzzleHttp;
+
+use WP_Ultimo\Dependencies\GuzzleHttp\Cookie\CookieJarInterface;
+use WP_Ultimo\Dependencies\GuzzleHttp\Exception\RequestException;
+use WP_Ultimo\Dependencies\GuzzleHttp\Promise as P;
+use WP_Ultimo\Dependencies\GuzzleHttp\Promise\PromiseInterface;
+use WP_Ultimo\Dependencies\Psr\Http\Message\RequestInterface;
+use WP_Ultimo\Dependencies\Psr\Http\Message\ResponseInterface;
+use WP_Ultimo\Dependencies\Psr\Log\LoggerInterface;
+/**
+ * Functions used to create and wrap handlers with handler middleware.
+ */
+final class Middleware
+{
+    /**
+     * Middleware that adds cookies to requests.
+     *
+     * The options array must be set to a CookieJarInterface in order to use
+     * cookies. This is typically handled for you by a client.
+     *
+     * @return callable Returns a function that accepts the next handler.
+     */
+    public static function cookies() : callable
+    {
+        return static function (callable $handler) : callable {
+            return static function ($request, array $options) use($handler) {
+                if (empty($options['cookies'])) {
+                    return $handler($request, $options);
+                } elseif (!$options['cookies'] instanceof CookieJarInterface) {
+                    throw new \InvalidArgumentException('cookies must be an instance of GuzzleHttp\\Cookie\\CookieJarInterface');
+                }
+                $cookieJar = $options['cookies'];
+                $request = $cookieJar->withCookieHeader($request);
+                return $handler($request, $options)->then(static function (ResponseInterface $response) use($cookieJar, $request) : ResponseInterface {
+                    $cookieJar->extractCookies($request, $response);
+                    return $response;
+                });
+            };
+        };
+    }
+    /**
+     * Middleware that throws exceptions for 4xx or 5xx responses when the
+     * "http_errors" request option is set to true.
+     *
+     * @param BodySummarizerInterface|null $bodySummarizer The body summarizer to use in exception messages.
+     *
+     * @return callable(callable): callable Returns a function that accepts the next handler.
+     */
+    public static function httpErrors(BodySummarizerInterface $bodySummarizer = null) : callable
+    {
+        return static function (callable $handler) use($bodySummarizer) : callable {
+            return static function ($request, array $options) use($handler, $bodySummarizer) {
+                if (empty($options['http_errors'])) {
+                    return $handler($request, $options);
+                }
+                return $handler($request, $options)->then(static function (ResponseInterface $response) use($request, $bodySummarizer) {
+                    $code = $response->getStatusCode();
+                    if ($code < 400) {
+                        return $response;
+                    }
+                    throw RequestException::create($request, $response, null, [], $bodySummarizer);
+                });
+            };
+        };
+    }
+    /**
+     * Middleware that pushes history data to an ArrayAccess container.
+     *
+     * @param array|\ArrayAccess<int, array> $container Container to hold the history (by reference).
+     *
+     * @return callable(callable): callable Returns a function that accepts the next handler.
+     *
+     * @throws \InvalidArgumentException if container is not an array or ArrayAccess.
+     */
+    public static function history(&$container) : callable
+    {
+        if (!\is_array($container) && !$container instanceof \ArrayAccess) {
+            throw new \InvalidArgumentException('history container must be an array or object implementing ArrayAccess');
+        }
+        return static function (callable $handler) use(&$container) : callable {
+            return static function (RequestInterface $request, array $options) use($handler, &$container) {
+                return $handler($request, $options)->then(static function ($value) use($request, &$container, $options) {
+                    $container[] = ['request' => $request, 'response' => $value, 'error' => null, 'options' => $options];
+                    return $value;
+                }, static function ($reason) use($request, &$container, $options) {
+                    $container[] = ['request' => $request, 'response' => null, 'error' => $reason, 'options' => $options];
+                    return P\Create::rejectionFor($reason);
+                });
+            };
+        };
+    }
+    /**
+     * Middleware that invokes a callback before and after sending a request.
+     *
+     * The provided listener cannot modify or alter the response. It simply
+     * "taps" into the chain to be notified before returning the promise. The
+     * before listener accepts a request and options array, and the after
+     * listener accepts a request, options array, and response promise.
+     *
+     * @param callable $before Function to invoke before forwarding the request.
+     * @param callable $after  Function invoked after forwarding.
+     *
+     * @return callable Returns a function that accepts the next handler.
+     */
+    public static function tap(callable $before = null, callable $after = null) : callable
+    {
+        return static function (callable $handler) use($before, $after) : callable {
+            return static function (RequestInterface $request, array $options) use($handler, $before, $after) {
+                if ($before) {
+                    $before($request, $options);
+                }
+                $response = $handler($request, $options);
+                if ($after) {
+                    $after($request, $options, $response);
+                }
+                return $response;
+            };
+        };
+    }
+    /**
+     * Middleware that handles request redirects.
+     *
+     * @return callable Returns a function that accepts the next handler.
+     */
+    public static function redirect() : callable
+    {
+        return static function (callable $handler) : RedirectMiddleware {
+            return new RedirectMiddleware($handler);
+        };
+    }
+    /**
+     * Middleware that retries requests based on the boolean result of
+     * invoking the provided "decider" function.
+     *
+     * If no delay function is provided, a simple implementation of exponential
+     * backoff will be utilized.
+     *
+     * @param callable $decider Function that accepts the number of retries,
+     *                          a request, [response], and [exception] and
+     *                          returns true if the request is to be retried.
+     * @param callable $delay   Function that accepts the number of retries and
+     *                          returns the number of milliseconds to delay.
+     *
+     * @return callable Returns a function that accepts the next handler.
+     */
+    public static function retry(callable $decider, callable $delay = null) : callable
+    {
+        return static function (callable $handler) use($decider, $delay) : RetryMiddleware {
+            return new RetryMiddleware($decider, $handler, $delay);
+        };
+    }
+    /**
+     * Middleware that logs requests, responses, and errors using a message
+     * formatter.
+     *
+     * @phpstan-param \Psr\Log\LogLevel::* $logLevel  Level at which to log requests.
+     *
+     * @param LoggerInterface                            $logger    Logs messages.
+     * @param MessageFormatterInterface|MessageFormatter $formatter Formatter used to create message strings.
+     * @param string                                     $logLevel  Level at which to log requests.
+     *
+     * @return callable Returns a function that accepts the next handler.
+     */
+    public static function log(LoggerInterface $logger, $formatter, string $logLevel = 'info') : callable
+    {
+        // To be compatible with Guzzle 7.1.x we need to allow users to pass a MessageFormatter
+        if (!$formatter instanceof MessageFormatter && !$formatter instanceof MessageFormatterInterface) {
+            throw new \LogicException(\sprintf('Argument 2 to %s::log() must be of type %s', self::class, MessageFormatterInterface::class));
+        }
+        return static function (callable $handler) use($logger, $formatter, $logLevel) : callable {
+            return static function (RequestInterface $request, array $options = []) use($handler, $logger, $formatter, $logLevel) {
+                return $handler($request, $options)->then(static function ($response) use($logger, $request, $formatter, $logLevel) : ResponseInterface {
+                    $message = $formatter->format($request, $response);
+                    $logger->log($logLevel, $message);
+                    return $response;
+                }, static function ($reason) use($logger, $request, $formatter) : PromiseInterface {
+                    $response = $reason instanceof RequestException ? $reason->getResponse() : null;
+                    $message = $formatter->format($request, $response, P\Create::exceptionFor($reason));
+                    $logger->error($message);
+                    return P\Create::rejectionFor($reason);
+                });
+            };
+        };
+    }
+    /**
+     * This middleware adds a default content-type if possible, a default
+     * content-length or transfer-encoding header, and the expect header.
+     */
+    public static function prepareBody() : callable
+    {
+        return static function (callable $handler) : PrepareBodyMiddleware {
+            return new PrepareBodyMiddleware($handler);
+        };
+    }
+    /**
+     * Middleware that applies a map function to the request before passing to
+     * the next handler.
+     *
+     * @param callable $fn Function that accepts a RequestInterface and returns
+     *                     a RequestInterface.
+     */
+    public static function mapRequest(callable $fn) : callable
+    {
+        return static function (callable $handler) use($fn) : callable {
+            return static function (RequestInterface $request, array $options) use($handler, $fn) {
+                return $handler($fn($request), $options);
+            };
+        };
+    }
+    /**
+     * Middleware that applies a map function to the resolved promise's
+     * response.
+     *
+     * @param callable $fn Function that accepts a ResponseInterface and
+     *                     returns a ResponseInterface.
+     */
+    public static function mapResponse(callable $fn) : callable
+    {
+        return static function (callable $handler) use($fn) : callable {
+            return static function (RequestInterface $request, array $options) use($handler, $fn) {
+                return $handler($request, $options)->then($fn);
+            };
+        };
+    }
+}

dependencies/guzzlehttp/guzzle/src/Pool.php

@@ -0,0 +1,116 @@
+<?php
+
+namespace WP_Ultimo\Dependencies\GuzzleHttp;
+
+use WP_Ultimo\Dependencies\GuzzleHttp\Promise as P;
+use WP_Ultimo\Dependencies\GuzzleHttp\Promise\EachPromise;
+use WP_Ultimo\Dependencies\GuzzleHttp\Promise\PromiseInterface;
+use WP_Ultimo\Dependencies\GuzzleHttp\Promise\PromisorInterface;
+use WP_Ultimo\Dependencies\Psr\Http\Message\RequestInterface;
+/**
+ * Sends an iterator of requests concurrently using a capped pool size.
+ *
+ * The pool will read from an iterator until it is cancelled or until the
+ * iterator is consumed. When a request is yielded, the request is sent after
+ * applying the "request_options" request options (if provided in the ctor).
+ *
+ * When a function is yielded by the iterator, the function is provided the
+ * "request_options" array that should be merged on top of any existing
+ * options, and the function MUST then return a wait-able promise.
+ *
+ * @final
+ */
+class Pool implements PromisorInterface
+{
+    /**
+     * @var EachPromise
+     */
+    private $each;
+    /**
+     * @param ClientInterface $client   Client used to send the requests.
+     * @param array|\Iterator $requests Requests or functions that return
+     *                                  requests to send concurrently.
+     * @param array           $config   Associative array of options
+     *                                  - concurrency: (int) Maximum number of requests to send concurrently
+     *                                  - options: Array of request options to apply to each request.
+     *                                  - fulfilled: (callable) Function to invoke when a request completes.
+     *                                  - rejected: (callable) Function to invoke when a request is rejected.
+     */
+    public function __construct(ClientInterface $client, $requests, array $config = [])
+    {
+        if (!isset($config['concurrency'])) {
+            $config['concurrency'] = 25;
+        }
+        if (isset($config['options'])) {
+            $opts = $config['options'];
+            unset($config['options']);
+        } else {
+            $opts = [];
+        }
+        $iterable = P\Create::iterFor($requests);
+        $requests = static function () use($iterable, $client, $opts) {
+            foreach ($iterable as $key => $rfn) {
+                if ($rfn instanceof RequestInterface) {
+                    (yield $key => $client->sendAsync($rfn, $opts));
+                } elseif (\is_callable($rfn)) {
+                    (yield $key => $rfn($opts));
+                } else {
+                    throw new \InvalidArgumentException('Each value yielded by the iterator must be a Psr7\\Http\\Message\\RequestInterface or a callable that returns a promise that fulfills with a Psr7\\Message\\Http\\ResponseInterface object.');
+                }
+            }
+        };
+        $this->each = new EachPromise($requests(), $config);
+    }
+    /**
+     * Get promise
+     */
+    public function promise() : PromiseInterface
+    {
+        return $this->each->promise();
+    }
+    /**
+     * Sends multiple requests concurrently and returns an array of responses
+     * and exceptions that uses the same ordering as the provided requests.
+     *
+     * IMPORTANT: This method keeps every request and response in memory, and
+     * as such, is NOT recommended when sending a large number or an
+     * indeterminate number of requests concurrently.
+     *
+     * @param ClientInterface $client   Client used to send the requests
+     * @param array|\Iterator $requests Requests to send concurrently.
+     * @param array           $options  Passes through the options available in
+     *                                  {@see \GuzzleHttp\Pool::__construct}
+     *
+     * @return array Returns an array containing the response or an exception
+     *               in the same order that the requests were sent.
+     *
+     * @throws \InvalidArgumentException if the event format is incorrect.
+     */
+    public static function batch(ClientInterface $client, $requests, array $options = []) : array
+    {
+        $res = [];
+        self::cmpCallback($options, 'fulfilled', $res);
+        self::cmpCallback($options, 'rejected', $res);
+        $pool = new static($client, $requests, $options);
+        $pool->promise()->wait();
+        \ksort($res);
+        return $res;
+    }
+    /**
+     * Execute callback(s)
+     */
+    private static function cmpCallback(array &$options, string $name, array &$results) : void
+    {
+        if (!isset($options[$name])) {
+            $options[$name] = static function ($v, $k) use(&$results) {
+                $results[$k] = $v;
+            };
+        } else {
+            $currentFn = $options[$name];
+            $options[$name] = static function ($v, $k) use(&$results, $currentFn) {
+                $currentFn($v, $k);
+                $results[$k] = $v;
+            };
+        }
+    }
+}

dependencies/guzzlehttp/guzzle/src/PrepareBodyMiddleware.php

@@ -0,0 +1,86 @@
+<?php
+
+namespace WP_Ultimo\Dependencies\GuzzleHttp;
+
+use WP_Ultimo\Dependencies\GuzzleHttp\Promise\PromiseInterface;
+use WP_Ultimo\Dependencies\Psr\Http\Message\RequestInterface;
+/**
+ * Prepares requests that contain a body, adding the Content-Length,
+ * Content-Type, and Expect headers.
+ *
+ * @final
+ */
+class PrepareBodyMiddleware
+{
+    /**
+     * @var callable(RequestInterface, array): PromiseInterface
+     */
+    private $nextHandler;
+    /**
+     * @param callable(RequestInterface, array): PromiseInterface $nextHandler Next handler to invoke.
+     */
+    public function __construct(callable $nextHandler)
+    {
+        $this->nextHandler = $nextHandler;
+    }
+    public function __invoke(RequestInterface $request, array $options) : PromiseInterface
+    {
+        $fn = $this->nextHandler;
+        // Don't do anything if the request has no body.
+        if ($request->getBody()->getSize() === 0) {
+            return $fn($request, $options);
+        }
+        $modify = [];
+        // Add a default content-type if possible.
+        if (!$request->hasHeader('Content-Type')) {
+            if ($uri = $request->getBody()->getMetadata('uri')) {
+                if (\is_string($uri) && ($type = Psr7\MimeType::fromFilename($uri))) {
+                    $modify['set_headers']['Content-Type'] = $type;
+                }
+            }
+        }
+        // Add a default content-length or transfer-encoding header.
+        if (!$request->hasHeader('Content-Length') && !$request->hasHeader('Transfer-Encoding')) {
+            $size = $request->getBody()->getSize();
+            if ($size !== null) {
+                $modify['set_headers']['Content-Length'] = $size;
+            } else {
+                $modify['set_headers']['Transfer-Encoding'] = 'chunked';
+            }
+        }
+        // Add the expect header if needed.
+        $this->addExpectHeader($request, $options, $modify);
+        return $fn(Psr7\Utils::modifyRequest($request, $modify), $options);
+    }
+    /**
+     * Add expect header
+     */
+    private function addExpectHeader(RequestInterface $request, array $options, array &$modify) : void
+    {
+        // Determine if the Expect header should be used
+        if ($request->hasHeader('Expect')) {
+            return;
+        }
+        $expect = $options['expect'] ?? null;
+        // Return if disabled or if you're not using HTTP/1.1 or HTTP/2.0
+        if ($expect === \false || $request->getProtocolVersion() < 1.1) {
+            return;
+        }
+        // The expect header is unconditionally enabled
+        if ($expect === \true) {
+            $modify['set_headers']['Expect'] = '100-Continue';
+            return;
+        }
+        // By default, send the expect header when the payload is > 1mb
+        if ($expect === null) {
+            $expect = 1048576;
+        }
+        // Always add if the body cannot be rewound, the size cannot be
+        // determined, or the size is greater than the cutoff threshold
+        $body = $request->getBody();
+        $size = $body->getSize();
+        if ($size === null || $size >= (int) $expect || !$body->isSeekable()) {
+            $modify['set_headers']['Expect'] = '100-Continue';
+        }
+    }
+}

dependencies/guzzlehttp/guzzle/src/RedirectMiddleware.php

@@ -0,0 +1,162 @@
+<?php
+
+namespace WP_Ultimo\Dependencies\GuzzleHttp;
+
+use WP_Ultimo\Dependencies\GuzzleHttp\Exception\BadResponseException;
+use WP_Ultimo\Dependencies\GuzzleHttp\Exception\TooManyRedirectsException;
+use WP_Ultimo\Dependencies\GuzzleHttp\Promise\PromiseInterface;
+use WP_Ultimo\Dependencies\Psr\Http\Message\RequestInterface;
+use WP_Ultimo\Dependencies\Psr\Http\Message\ResponseInterface;
+use WP_Ultimo\Dependencies\Psr\Http\Message\UriInterface;
+/**
+ * Request redirect middleware.
+ *
+ * Apply this middleware like other middleware using
+ * {@see \GuzzleHttp\Middleware::redirect()}.
+ *
+ * @final
+ */
+class RedirectMiddleware
+{
+    public const HISTORY_HEADER = 'X-Guzzle-Redirect-History';
+    public const STATUS_HISTORY_HEADER = 'X-Guzzle-Redirect-Status-History';
+    /**
+     * @var array
+     */
+    public static $defaultSettings = ['max' => 5, 'protocols' => ['http', 'https'], 'strict' => \false, 'referer' => \false, 'track_redirects' => \false];
+    /**
+     * @var callable(RequestInterface, array): PromiseInterface
+     */
+    private $nextHandler;
+    /**
+     * @param callable(RequestInterface, array): PromiseInterface $nextHandler Next handler to invoke.
+     */
+    public function __construct(callable $nextHandler)
+    {
+        $this->nextHandler = $nextHandler;
+    }
+    public function __invoke(RequestInterface $request, array $options) : PromiseInterface
+    {
+        $fn = $this->nextHandler;
+        if (empty($options['allow_redirects'])) {
+            return $fn($request, $options);
+        }
+        if ($options['allow_redirects'] === \true) {
+            $options['allow_redirects'] = self::$defaultSettings;
+        } elseif (!\is_array($options['allow_redirects'])) {
+            throw new \InvalidArgumentException('allow_redirects must be true, false, or array');
+        } else {
+            // Merge the default settings with the provided settings
+            $options['allow_redirects'] += self::$defaultSettings;
+        }
+        if (empty($options['allow_redirects']['max'])) {
+            return $fn($request, $options);
+        }
+        return $fn($request, $options)->then(function (ResponseInterface $response) use($request, $options) {
+            return $this->checkRedirect($request, $options, $response);
+        });
+    }
+    /**
+     * @return ResponseInterface|PromiseInterface
+     */
+    public function checkRedirect(RequestInterface $request, array $options, ResponseInterface $response)
+    {
+        if (\strpos((string) $response->getStatusCode(), '3') !== 0 || !$response->hasHeader('Location')) {
+            return $response;
+        }
+        $this->guardMax($request, $response, $options);
+        $nextRequest = $this->modifyRequest($request, $options, $response);
+        // If authorization is handled by curl, unset it if URI is cross-origin.
+        if (Psr7\UriComparator::isCrossOrigin($request->getUri(), $nextRequest->getUri()) && \defined('\\CURLOPT_HTTPAUTH')) {
+            unset($options['curl'][\CURLOPT_HTTPAUTH], $options['curl'][\CURLOPT_USERPWD]);
+        }
+        if (isset($options['allow_redirects']['on_redirect'])) {
+            $options['allow_redirects']['on_redirect']($request, $response, $nextRequest->getUri());
+        }
+        $promise = $this($nextRequest, $options);
+        // Add headers to be able to track history of redirects.
+        if (!empty($options['allow_redirects']['track_redirects'])) {
+            return $this->withTracking($promise, (string) $nextRequest->getUri(), $response->getStatusCode());
+        }
+        return $promise;
+    }
+    /**
+     * Enable tracking on promise.
+     */
+    private function withTracking(PromiseInterface $promise, string $uri, int $statusCode) : PromiseInterface
+    {
+        return $promise->then(static function (ResponseInterface $response) use($uri, $statusCode) {
+            // Note that we are pushing to the front of the list as this
+            // would be an earlier response than what is currently present
+            // in the history header.
+            $historyHeader = $response->getHeader(self::HISTORY_HEADER);
+            $statusHeader = $response->getHeader(self::STATUS_HISTORY_HEADER);
+            \array_unshift($historyHeader, $uri);
+            \array_unshift($statusHeader, (string) $statusCode);
+            return $response->withHeader(self::HISTORY_HEADER, $historyHeader)->withHeader(self::STATUS_HISTORY_HEADER, $statusHeader);
+        });
+    }
+    /**
+     * Check for too many redirects.
+     *
+     * @throws TooManyRedirectsException Too many redirects.
+     */
+    private function guardMax(RequestInterface $request, ResponseInterface $response, array &$options) : void
+    {
+        $current = $options['__redirect_count'] ?? 0;
+        $options['__redirect_count'] = $current + 1;
+        $max = $options['allow_redirects']['max'];
+        if ($options['__redirect_count'] > $max) {
+            throw new TooManyRedirectsException("Will not follow more than {$max} redirects", $request, $response);
+        }
+    }
+    public function modifyRequest(RequestInterface $request, array $options, ResponseInterface $response) : RequestInterface
+    {
+        // Request modifications to apply.
+        $modify = [];
+        $protocols = $options['allow_redirects']['protocols'];
+        // Use a GET request if this is an entity enclosing request and we are
+        // not forcing RFC compliance, but rather emulating what all browsers
+        // would do.
+        $statusCode = $response->getStatusCode();
+        if ($statusCode == 303 || $statusCode <= 302 && !$options['allow_redirects']['strict']) {
+            $safeMethods = ['GET', 'HEAD', 'OPTIONS'];
+            $requestMethod = $request->getMethod();
+            $modify['method'] = \in_array($requestMethod, $safeMethods) ? $requestMethod : 'GET';
+            $modify['body'] = '';
+        }
+        $uri = self::redirectUri($request, $response, $protocols);
+        if (isset($options['idn_conversion']) && $options['idn_conversion'] !== \false) {
+            $idnOptions = $options['idn_conversion'] === \true ? \IDNA_DEFAULT : $options['idn_conversion'];
+            $uri = Utils::idnUriConvert($uri, $idnOptions);
+        }
+        $modify['uri'] = $uri;
+        Psr7\Message::rewindBody($request);
+        // Add the Referer header if it is told to do so and only
+        // add the header if we are not redirecting from https to http.
+        if ($options['allow_redirects']['referer'] && $modify['uri']->getScheme() === $request->getUri()->getScheme()) {
+            $uri = $request->getUri()->withUserInfo('');
+            $modify['set_headers']['Referer'] = (string) $uri;
+        } else {
+            $modify['remove_headers'][] = 'Referer';
+        }
+        // Remove Authorization and Cookie headers if URI is cross-origin.
+        if (Psr7\UriComparator::isCrossOrigin($request->getUri(), $modify['uri'])) {
+            $modify['remove_headers'][] = 'Authorization';
+            $modify['remove_headers'][] = 'Cookie';
+        }
+        return Psr7\Utils::modifyRequest($request, $modify);
+    }
+    /**
+     * Set the appropriate URL on the request based on the location header.
+     */
+    private static function redirectUri(RequestInterface $request, ResponseInterface $response, array $protocols) : UriInterface
+    {
+        $location = Psr7\UriResolver::resolve($request->getUri(), new Psr7\Uri($response->getHeaderLine('Location')));
+        // Ensure that the redirect URI is allowed based on the protocols.
+        if (!\in_array($location->getScheme(), $protocols)) {
+            throw new BadResponseException(\sprintf('Redirect URI, %s, does not use one of the allowed redirect protocols: %s', $location, \implode(', ', $protocols)), $request, $response);
+        }
+        return $location;
+    }
+}

dependencies/guzzlehttp/guzzle/src/RequestOptions.php

@@ -0,0 +1,246 @@
+<?php
+
+namespace WP_Ultimo\Dependencies\GuzzleHttp;
+
+/**
+ * This class contains a list of built-in Guzzle request options.
+ *
+ * More documentation for each option can be found at http://guzzlephp.org/.
+ *
+ * @see http://docs.guzzlephp.org/en/v6/request-options.html
+ */
+final class RequestOptions
+{
+    /**
+     * allow_redirects: (bool|array) Controls redirect behavior. Pass false
+     * to disable redirects, pass true to enable redirects, pass an
+     * associative to provide custom redirect settings. Defaults to "false".
+     * This option only works if your handler has the RedirectMiddleware. When
+     * passing an associative array, you can provide the following key value
+     * pairs:
+     *
+     * - max: (int, default=5) maximum number of allowed redirects.
+     * - strict: (bool, default=false) Set to true to use strict redirects
+     *   meaning redirect POST requests with POST requests vs. doing what most
+     *   browsers do which is redirect POST requests with GET requests
+     * - referer: (bool, default=false) Set to true to enable the Referer
+     *   header.
+     * - protocols: (array, default=['http', 'https']) Allowed redirect
+     *   protocols.
+     * - on_redirect: (callable) PHP callable that is invoked when a redirect
+     *   is encountered. The callable is invoked with the request, the redirect
+     *   response that was received, and the effective URI. Any return value
+     *   from the on_redirect function is ignored.
+     */
+    public const ALLOW_REDIRECTS = 'allow_redirects';
+    /**
+     * auth: (array) Pass an array of HTTP authentication parameters to use
+     * with the request. The array must contain the username in index [0],
+     * the password in index [1], and you can optionally provide a built-in
+     * authentication type in index [2]. Pass null to disable authentication
+     * for a request.
+     */
+    public const AUTH = 'auth';
+    /**
+     * body: (resource|string|null|int|float|StreamInterface|callable|\Iterator)
+     * Body to send in the request.
+     */
+    public const BODY = 'body';
+    /**
+     * cert: (string|array) Set to a string to specify the path to a file
+     * containing a PEM formatted SSL client side certificate. If a password
+     * is required, then set cert to an array containing the path to the PEM
+     * file in the first array element followed by the certificate password
+     * in the second array element.
+     */
+    public const CERT = 'cert';
+    /**
+     * cookies: (bool|GuzzleHttp\Cookie\CookieJarInterface, default=false)
+     * Specifies whether or not cookies are used in a request or what cookie
+     * jar to use or what cookies to send. This option only works if your
+     * handler has the `cookie` middleware. Valid values are `false` and
+     * an instance of {@see \GuzzleHttp\Cookie\CookieJarInterface}.
+     */
+    public const COOKIES = 'cookies';
+    /**
+     * connect_timeout: (float, default=0) Float describing the number of
+     * seconds to wait while trying to connect to a server. Use 0 to wait
+     * 300 seconds (the default behavior).
+     */
+    public const CONNECT_TIMEOUT = 'connect_timeout';
+    /**
+     * crypto_method: (int) A value describing the minimum TLS protocol
+     * version to use.
+     *
+     * This setting must be set to one of the
+     * ``STREAM_CRYPTO_METHOD_TLS*_CLIENT`` constants. PHP 7.4 or higher is
+     * required in order to use TLS 1.3, and cURL 7.34.0 or higher is required
+     * in order to specify a crypto method, with cURL 7.52.0 or higher being
+     * required to use TLS 1.3.
+     */
+    public const CRYPTO_METHOD = 'crypto_method';
+    /**
+     * debug: (bool|resource) Set to true or set to a PHP stream returned by
+     * fopen()  enable debug output with the HTTP handler used to send a
+     * request.
+     */
+    public const DEBUG = 'debug';
+    /**
+     * decode_content: (bool, default=true) Specify whether or not
+     * Content-Encoding responses (gzip, deflate, etc.) are automatically
+     * decoded.
+     */
+    public const DECODE_CONTENT = 'decode_content';
+    /**
+     * delay: (int) The amount of time to delay before sending in milliseconds.
+     */
+    public const DELAY = 'delay';
+    /**
+     * expect: (bool|integer) Controls the behavior of the
+     * "Expect: 100-Continue" header.
+     *
+     * Set to `true` to enable the "Expect: 100-Continue" header for all
+     * requests that sends a body. Set to `false` to disable the
+     * "Expect: 100-Continue" header for all requests. Set to a number so that
+     * the size of the payload must be greater than the number in order to send
+     * the Expect header. Setting to a number will send the Expect header for
+     * all requests in which the size of the payload cannot be determined or
+     * where the body is not rewindable.
+     *
+     * By default, Guzzle will add the "Expect: 100-Continue" header when the
+     * size of the body of a request is greater than 1 MB and a request is
+     * using HTTP/1.1.
+     */
+    public const EXPECT = 'expect';
+    /**
+     * form_params: (array) Associative array of form field names to values
+     * where each value is a string or array of strings. Sets the Content-Type
+     * header to application/x-www-form-urlencoded when no Content-Type header
+     * is already present.
+     */
+    public const FORM_PARAMS = 'form_params';
+    /**
+     * headers: (array) Associative array of HTTP headers. Each value MUST be
+     * a string or array of strings.
+     */
+    public const HEADERS = 'headers';
+    /**
+     * http_errors: (bool, default=true) Set to false to disable exceptions
+     * when a non- successful HTTP response is received. By default,
+     * exceptions will be thrown for 4xx and 5xx responses. This option only
+     * works if your handler has the `httpErrors` middleware.
+     */
+    public const HTTP_ERRORS = 'http_errors';
+    /**
+     * idn: (bool|int, default=true) A combination of IDNA_* constants for
+     * idn_to_ascii() PHP's function (see "options" parameter). Set to false to
+     * disable IDN support completely, or to true to use the default
+     * configuration (IDNA_DEFAULT constant).
+     */
+    public const IDN_CONVERSION = 'idn_conversion';
+    /**
+     * json: (mixed) Adds JSON data to a request. The provided value is JSON
+     * encoded and a Content-Type header of application/json will be added to
+     * the request if no Content-Type header is already present.
+     */
+    public const JSON = 'json';
+    /**
+     * multipart: (array) Array of associative arrays, each containing a
+     * required "name" key mapping to the form field, name, a required
+     * "contents" key mapping to a StreamInterface|resource|string, an
+     * optional "headers" associative array of custom headers, and an
+     * optional "filename" key mapping to a string to send as the filename in
+     * the part. If no "filename" key is present, then no "filename" attribute
+     * will be added to the part.
+     */
+    public const MULTIPART = 'multipart';
+    /**
+     * on_headers: (callable) A callable that is invoked when the HTTP headers
+     * of the response have been received but the body has not yet begun to
+     * download.
+     */
+    public const ON_HEADERS = 'on_headers';
+    /**
+     * on_stats: (callable) allows you to get access to transfer statistics of
+     * a request and access the lower level transfer details of the handler
+     * associated with your client. ``on_stats`` is a callable that is invoked
+     * when a handler has finished sending a request. The callback is invoked
+     * with transfer statistics about the request, the response received, or
+     * the error encountered. Included in the data is the total amount of time
+     * taken to send the request.
+     */
+    public const ON_STATS = 'on_stats';
+    /**
+     * progress: (callable) Defines a function to invoke when transfer
+     * progress is made. The function accepts the following positional
+     * arguments: the total number of bytes expected to be downloaded, the
+     * number of bytes downloaded so far, the number of bytes expected to be
+     * uploaded, the number of bytes uploaded so far.
+     */
+    public const PROGRESS = 'progress';
+    /**
+     * proxy: (string|array) Pass a string to specify an HTTP proxy, or an
+     * array to specify different proxies for different protocols (where the
+     * key is the protocol and the value is a proxy string).
+     */
+    public const PROXY = 'proxy';
+    /**
+     * query: (array|string) Associative array of query string values to add
+     * to the request. This option uses PHP's http_build_query() to create
+     * the string representation. Pass a string value if you need more
+     * control than what this method provides
+     */
+    public const QUERY = 'query';
+    /**
+     * sink: (resource|string|StreamInterface) Where the data of the
+     * response is written to. Defaults to a PHP temp stream. Providing a
+     * string will write data to a file by the given name.
+     */
+    public const SINK = 'sink';
+    /**
+     * synchronous: (bool) Set to true to inform HTTP handlers that you intend
+     * on waiting on the response. This can be useful for optimizations. Note
+     * that a promise is still returned if you are using one of the async
+     * client methods.
+     */
+    public const SYNCHRONOUS = 'synchronous';
+    /**
+     * ssl_key: (array|string) Specify the path to a file containing a private
+     * SSL key in PEM format. If a password is required, then set to an array
+     * containing the path to the SSL key in the first array element followed
+     * by the password required for the certificate in the second element.
+     */
+    public const SSL_KEY = 'ssl_key';
+    /**
+     * stream: Set to true to attempt to stream a response rather than
+     * download it all up-front.
+     */
+    public const STREAM = 'stream';
+    /**
+     * verify: (bool|string, default=true) Describes the SSL certificate
+     * verification behavior of a request. Set to true to enable SSL
+     * certificate verification using the system CA bundle when available
+     * (the default). Set to false to disable certificate verification (this
+     * is insecure!). Set to a string to provide the path to a CA bundle on
+     * disk to enable verification using a custom certificate.
+     */
+    public const VERIFY = 'verify';
+    /**
+     * timeout: (float, default=0) Float describing the timeout of the
+     * request in seconds. Use 0 to wait indefinitely (the default behavior).
+     */
+    public const TIMEOUT = 'timeout';
+    /**
+     * read_timeout: (float, default=default_socket_timeout ini setting) Float describing
+     * the body read timeout, for stream requests.
+     */
+    public const READ_TIMEOUT = 'read_timeout';
+    /**
+     * version: (float) Specifies the HTTP protocol version to attempt to use.
+     */
+    public const VERSION = 'version';
+    /**
+     * force_ip_resolve: (bool) Force client to use only ipv4 or ipv6 protocol
+     */
+    public const FORCE_IP_RESOLVE = 'force_ip_resolve';
+}

dependencies/guzzlehttp/guzzle/src/RetryMiddleware.php

@@ -0,0 +1,91 @@
+<?php
+
+namespace WP_Ultimo\Dependencies\GuzzleHttp;
+
+use WP_Ultimo\Dependencies\GuzzleHttp\Promise as P;
+use WP_Ultimo\Dependencies\GuzzleHttp\Promise\PromiseInterface;
+use WP_Ultimo\Dependencies\Psr\Http\Message\RequestInterface;
+use WP_Ultimo\Dependencies\Psr\Http\Message\ResponseInterface;
+/**
+ * Middleware that retries requests based on the boolean result of
+ * invoking the provided "decider" function.
+ *
+ * @final
+ */
+class RetryMiddleware
+{
+    /**
+     * @var callable(RequestInterface, array): PromiseInterface
+     */
+    private $nextHandler;
+    /**
+     * @var callable
+     */
+    private $decider;
+    /**
+     * @var callable(int)
+     */
+    private $delay;
+    /**
+     * @param callable                                            $decider     Function that accepts the number of retries,
+     *                                                                         a request, [response], and [exception] and
+     *                                                                         returns true if the request is to be
+     *                                                                         retried.
+     * @param callable(RequestInterface, array): PromiseInterface $nextHandler Next handler to invoke.
+     * @param (callable(int): int)|null                           $delay       Function that accepts the number of retries
+     *                                                                         and returns the number of
+     *                                                                         milliseconds to delay.
+     */
+    public function __construct(callable $decider, callable $nextHandler, callable $delay = null)
+    {
+        $this->decider = $decider;
+        $this->nextHandler = $nextHandler;
+        $this->delay = $delay ?: __CLASS__ . '::exponentialDelay';
+    }
+    /**
+     * Default exponential backoff delay function.
+     *
+     * @return int milliseconds.
+     */
+    public static function exponentialDelay(int $retries) : int
+    {
+        return (int) 2 ** ($retries - 1) * 1000;
+    }
+    public function __invoke(RequestInterface $request, array $options) : PromiseInterface
+    {
+        if (!isset($options['retries'])) {
+            $options['retries'] = 0;
+        }
+        $fn = $this->nextHandler;
+        return $fn($request, $options)->then($this->onFulfilled($request, $options), $this->onRejected($request, $options));
+    }
+    /**
+     * Execute fulfilled closure
+     */
+    private function onFulfilled(RequestInterface $request, array $options) : callable
+    {
+        return function ($value) use($request, $options) {
+            if (!($this->decider)($options['retries'], $request, $value, null)) {
+                return $value;
+            }
+            return $this->doRetry($request, $options, $value);
+        };
+    }
+    /**
+     * Execute rejected closure
+     */
+    private function onRejected(RequestInterface $req, array $options) : callable
+    {
+        return function ($reason) use($req, $options) {
+            if (!($this->decider)($options['retries'], $req, null, $reason)) {
+                return P\Create::rejectionFor($reason);
+            }
+            return $this->doRetry($req, $options);
+        };
+    }
+    private function doRetry(RequestInterface $request, array $options, ResponseInterface $response = null) : PromiseInterface
+    {
+        $options['delay'] = ($this->delay)(++$options['retries'], $response, $request);
+        return $this($request, $options);
+    }
+}

dependencies/guzzlehttp/guzzle/src/TransferStats.php

@@ -0,0 +1,114 @@
+<?php
+
+namespace WP_Ultimo\Dependencies\GuzzleHttp;
+
+use WP_Ultimo\Dependencies\Psr\Http\Message\RequestInterface;
+use WP_Ultimo\Dependencies\Psr\Http\Message\ResponseInterface;
+use WP_Ultimo\Dependencies\Psr\Http\Message\UriInterface;
+/**
+ * Represents data at the point after it was transferred either successfully
+ * or after a network error.
+ */
+final class TransferStats
+{
+    /**
+     * @var RequestInterface
+     */
+    private $request;
+    /**
+     * @var ResponseInterface|null
+     */
+    private $response;
+    /**
+     * @var float|null
+     */
+    private $transferTime;
+    /**
+     * @var array
+     */
+    private $handlerStats;
+    /**
+     * @var mixed|null
+     */
+    private $handlerErrorData;
+    /**
+     * @param RequestInterface       $request          Request that was sent.
+     * @param ResponseInterface|null $response         Response received (if any)
+     * @param float|null             $transferTime     Total handler transfer time.
+     * @param mixed                  $handlerErrorData Handler error data.
+     * @param array                  $handlerStats     Handler specific stats.
+     */
+    public function __construct(RequestInterface $request, ResponseInterface $response = null, float $transferTime = null, $handlerErrorData = null, array $handlerStats = [])
+    {
+        $this->request = $request;
+        $this->response = $response;
+        $this->transferTime = $transferTime;
+        $this->handlerErrorData = $handlerErrorData;
+        $this->handlerStats = $handlerStats;
+    }
+    public function getRequest() : RequestInterface
+    {
+        return $this->request;
+    }
+    /**
+     * Returns the response that was received (if any).
+     */
+    public function getResponse() : ?ResponseInterface
+    {
+        return $this->response;
+    }
+    /**
+     * Returns true if a response was received.
+     */
+    public function hasResponse() : bool
+    {
+        return $this->response !== null;
+    }
+    /**
+     * Gets handler specific error data.
+     *
+     * This might be an exception, a integer representing an error code, or
+     * anything else. Relying on this value assumes that you know what handler
+     * you are using.
+     *
+     * @return mixed
+     */
+    public function getHandlerErrorData()
+    {
+        return $this->handlerErrorData;
+    }
+    /**
+     * Get the effective URI the request was sent to.
+     */
+    public function getEffectiveUri() : UriInterface
+    {
+        return $this->request->getUri();
+    }
+    /**
+     * Get the estimated time the request was being transferred by the handler.
+     *
+     * @return float|null Time in seconds.
+     */
+    public function getTransferTime() : ?float
+    {
+        return $this->transferTime;
+    }
+    /**
+     * Gets an array of all of the handler specific transfer data.
+     */
+    public function getHandlerStats() : array
+    {
+        return $this->handlerStats;
+    }
+    /**
+     * Get a specific handler statistic from the handler by name.
+     *
+     * @param string $stat Handler specific transfer stat to retrieve.
+     *
+     * @return mixed|null
+     */
+    public function getHandlerStat(string $stat)
+    {
+        return $this->handlerStats[$stat] ?? null;
+    }
+}

dependencies/guzzlehttp/guzzle/src/Utils.php

@@ -0,0 +1,340 @@
+<?php
+
+namespace WP_Ultimo\Dependencies\GuzzleHttp;
+
+use WP_Ultimo\Dependencies\GuzzleHttp\Exception\InvalidArgumentException;
+use WP_Ultimo\Dependencies\GuzzleHttp\Handler\CurlHandler;
+use WP_Ultimo\Dependencies\GuzzleHttp\Handler\CurlMultiHandler;
+use WP_Ultimo\Dependencies\GuzzleHttp\Handler\Proxy;
+use WP_Ultimo\Dependencies\GuzzleHttp\Handler\StreamHandler;
+use WP_Ultimo\Dependencies\Psr\Http\Message\UriInterface;
+final class Utils
+{
+    /**
+     * Debug function used to describe the provided value type and class.
+     *
+     * @param mixed $input
+     *
+     * @return string Returns a string containing the type of the variable and
+     *                if a class is provided, the class name.
+     */
+    public static function describeType($input) : string
+    {
+        switch (\gettype($input)) {
+            case 'object':
+                return 'object(' . \get_class($input) . ')';
+            case 'array':
+                return 'array(' . \count($input) . ')';
+            default:
+                \ob_start();
+                \var_dump($input);
+                // normalize float vs double
+                /** @var string $varDumpContent */
+                $varDumpContent = \ob_get_clean();
+                return \str_replace('double(', 'float(', \rtrim($varDumpContent));
+        }
+    }
+    /**
+     * Parses an array of header lines into an associative array of headers.
+     *
+     * @param iterable $lines Header lines array of strings in the following
+     *                        format: "Name: Value"
+     */
+    public static function headersFromLines(iterable $lines) : array
+    {
+        $headers = [];
+        foreach ($lines as $line) {
+            $parts = \explode(':', $line, 2);
+            $headers[\trim($parts[0])][] = isset($parts[1]) ? \trim($parts[1]) : null;
+        }
+        return $headers;
+    }
+    /**
+     * Returns a debug stream based on the provided variable.
+     *
+     * @param mixed $value Optional value
+     *
+     * @return resource
+     */
+    public static function debugResource($value = null)
+    {
+        if (\is_resource($value)) {
+            return $value;
+        }
+        if (\defined('STDOUT')) {
+            return \STDOUT;
+        }
+        return \WP_Ultimo\Dependencies\GuzzleHttp\Psr7\Utils::tryFopen('php://output', 'w');
+    }
+    /**
+     * Chooses and creates a default handler to use based on the environment.
+     *
+     * The returned handler is not wrapped by any default middlewares.
+     *
+     * @return callable(\Psr\Http\Message\RequestInterface, array): \GuzzleHttp\Promise\PromiseInterface Returns the best handler for the given system.
+     *
+     * @throws \RuntimeException if no viable Handler is available.
+     */
+    public static function chooseHandler() : callable
+    {
+        $handler = null;
+        if (\defined('CURLOPT_CUSTOMREQUEST')) {
+            if (\function_exists('curl_multi_exec') && \function_exists('curl_exec')) {
+                $handler = Proxy::wrapSync(new CurlMultiHandler(), new CurlHandler());
+            } elseif (\function_exists('curl_exec')) {
+                $handler = new CurlHandler();
+            } elseif (\function_exists('curl_multi_exec')) {
+                $handler = new CurlMultiHandler();
+            }
+        }
+        if (\ini_get('allow_url_fopen')) {
+            $handler = $handler ? Proxy::wrapStreaming($handler, new StreamHandler()) : new StreamHandler();
+        } elseif (!$handler) {
+            throw new \RuntimeException('GuzzleHttp requires cURL, the allow_url_fopen ini setting, or a custom HTTP handler.');
+        }
+        return $handler;
+    }
+    /**
+     * Get the default User-Agent string to use with Guzzle.
+     */
+    public static function defaultUserAgent() : string
+    {
+        return \sprintf('GuzzleHttp/%d', ClientInterface::MAJOR_VERSION);
+    }
+    /**
+     * Returns the default cacert bundle for the current system.
+     *
+     * First, the openssl.cafile and curl.cainfo php.ini settings are checked.
+     * If those settings are not configured, then the common locations for
+     * bundles found on Red Hat, CentOS, Fedora, Ubuntu, Debian, FreeBSD, OS X
+     * and Windows are checked. If any of these file locations are found on
+     * disk, they will be utilized.
+     *
+     * Note: the result of this function is cached for subsequent calls.
+     *
+     * @throws \RuntimeException if no bundle can be found.
+     *
+     * @deprecated Utils::defaultCaBundle will be removed in guzzlehttp/guzzle:8.0. This method is not needed in PHP 5.6+.
+     */
+    public static function defaultCaBundle() : string
+    {
+        static $cached = null;
+        static $cafiles = [
+            // Red Hat, CentOS, Fedora (provided by the ca-certificates package)
+            '/etc/pki/tls/certs/ca-bundle.crt',
+            // Ubuntu, Debian (provided by the ca-certificates package)
+            '/etc/ssl/certs/ca-certificates.crt',
+            // FreeBSD (provided by the ca_root_nss package)
+            '/usr/local/share/certs/ca-root-nss.crt',
+            // SLES 12 (provided by the ca-certificates package)
+            '/var/lib/ca-certificates/ca-bundle.pem',
+            // OS X provided by homebrew (using the default path)
+            '/usr/local/etc/openssl/cert.pem',
+            // Google app engine
+            '/etc/ca-certificates.crt',
+            // Windows?
+            'C:\\windows\\system32\\curl-ca-bundle.crt',
+            'C:\\windows\\curl-ca-bundle.crt',
+        ];
+        if ($cached) {
+            return $cached;
+        }
+        if ($ca = \ini_get('openssl.cafile')) {
+            return $cached = $ca;
+        }
+        if ($ca = \ini_get('curl.cainfo')) {
+            return $cached = $ca;
+        }
+        foreach ($cafiles as $filename) {
+            if (\file_exists($filename)) {
+                return $cached = $filename;
+            }
+        }
+        throw new \RuntimeException(<<<EOT
+No system CA bundle could be found in any of the the common system locations.
+PHP versions earlier than 5.6 are not properly configured to use the system's
+CA bundle by default. In order to verify peer certificates, you will need to
+supply the path on disk to a certificate bundle to the 'verify' request
+option: http://docs.guzzlephp.org/en/latest/clients.html#verify. If you do not
+need a specific certificate bundle, then Mozilla provides a commonly used CA
+bundle which can be downloaded here (provided by the maintainer of cURL):
+https://curl.haxx.se/ca/cacert.pem. Once
+you have a CA bundle available on disk, you can set the 'openssl.cafile' PHP
+ini setting to point to the path to the file, allowing you to omit the 'verify'
+request option. See https://curl.haxx.se/docs/sslcerts.html for more
+information.
+EOT
+);
+    }
+    /**
+     * Creates an associative array of lowercase header names to the actual
+     * header casing.
+     */
+    public static function normalizeHeaderKeys(array $headers) : array
+    {
+        $result = [];
+        foreach (\array_keys($headers) as $key) {
+            $result[\strtolower($key)] = $key;
+        }
+        return $result;
+    }
+    /**
+     * Returns true if the provided host matches any of the no proxy areas.
+     *
+     * This method will strip a port from the host if it is present. Each pattern
+     * can be matched with an exact match (e.g., "foo.com" == "foo.com") or a
+     * partial match: (e.g., "foo.com" == "baz.foo.com" and ".foo.com" ==
+     * "baz.foo.com", but ".foo.com" != "foo.com").
+     *
+     * Areas are matched in the following cases:
+     * 1. "*" (without quotes) always matches any hosts.
+     * 2. An exact match.
+     * 3. The area starts with "." and the area is the last part of the host. e.g.
+     *    '.mit.edu' will match any host that ends with '.mit.edu'.
+     *
+     * @param string   $host         Host to check against the patterns.
+     * @param string[] $noProxyArray An array of host patterns.
+     *
+     * @throws InvalidArgumentException
+     */
+    public static function isHostInNoProxy(string $host, array $noProxyArray) : bool
+    {
+        if (\strlen($host) === 0) {
+            throw new InvalidArgumentException('Empty host provided');
+        }
+        // Strip port if present.
+        [$host] = \explode(':', $host, 2);
+        foreach ($noProxyArray as $area) {
+            // Always match on wildcards.
+            if ($area === '*') {
+                return \true;
+            }
+            if (empty($area)) {
+                // Don't match on empty values.
+                continue;
+            }
+            if ($area === $host) {
+                // Exact matches.
+                return \true;
+            }
+            // Special match if the area when prefixed with ".". Remove any
+            // existing leading "." and add a new leading ".".
+            $area = '.' . \ltrim($area, '.');
+            if (\substr($host, -\strlen($area)) === $area) {
+                return \true;
+            }
+        }
+        return \false;
+    }
+    /**
+     * Wrapper for json_decode that throws when an error occurs.
+     *
+     * @param string $json    JSON data to parse
+     * @param bool   $assoc   When true, returned objects will be converted
+     *                        into associative arrays.
+     * @param int    $depth   User specified recursion depth.
+     * @param int    $options Bitmask of JSON decode options.
+     *
+     * @return object|array|string|int|float|bool|null
+     *
+     * @throws InvalidArgumentException if the JSON cannot be decoded.
+     *
+     * @see https://www.php.net/manual/en/function.json-decode.php
+     */
+    public static function jsonDecode(string $json, bool $assoc = \false, int $depth = 512, int $options = 0)
+    {
+        $data = \json_decode($json, $assoc, $depth, $options);
+        if (\JSON_ERROR_NONE !== \json_last_error()) {
+            throw new InvalidArgumentException('json_decode error: ' . \json_last_error_msg());
+        }
+        return $data;
+    }
+    /**
+     * Wrapper for JSON encoding that throws when an error occurs.
+     *
+     * @param mixed $value   The value being encoded
+     * @param int   $options JSON encode option bitmask
+     * @param int   $depth   Set the maximum depth. Must be greater than zero.
+     *
+     * @throws InvalidArgumentException if the JSON cannot be encoded.
+     *
+     * @see https://www.php.net/manual/en/function.json-encode.php
+     */
+    public static function jsonEncode($value, int $options = 0, int $depth = 512) : string
+    {
+        $json = \json_encode($value, $options, $depth);
+        if (\JSON_ERROR_NONE !== \json_last_error()) {
+            throw new InvalidArgumentException('json_encode error: ' . \json_last_error_msg());
+        }
+        /** @var string */
+        return $json;
+    }
+    /**
+     * Wrapper for the hrtime() or microtime() functions
+     * (depending on the PHP version, one of the two is used)
+     *
+     * @return float UNIX timestamp
+     *
+     * @internal
+     */
+    public static function currentTime() : float
+    {
+        return (float) \function_exists('hrtime') ? \hrtime(\true) / 1000000000.0 : \microtime(\true);
+    }
+    /**
+     * @throws InvalidArgumentException
+     *
+     * @internal
+     */
+    public static function idnUriConvert(UriInterface $uri, int $options = 0) : UriInterface
+    {
+        if ($uri->getHost()) {
+            $asciiHost = self::idnToAsci($uri->getHost(), $options, $info);
+            if ($asciiHost === \false) {
+                $errorBitSet = $info['errors'] ?? 0;
+                $errorConstants = \array_filter(\array_keys(\get_defined_constants()), static function (string $name) : bool {
+                    return \substr($name, 0, 11) === 'IDNA_ERROR_';
+                });
+                $errors = [];
+                foreach ($errorConstants as $errorConstant) {
+                    if ($errorBitSet & \constant($errorConstant)) {
+                        $errors[] = $errorConstant;
+                    }
+                }
+                $errorMessage = 'IDN conversion failed';
+                if ($errors) {
+                    $errorMessage .= ' (errors: ' . \implode(', ', $errors) . ')';
+                }
+                throw new InvalidArgumentException($errorMessage);
+            }
+            if ($uri->getHost() !== $asciiHost) {
+                // Replace URI only if the ASCII version is different
+                $uri = $uri->withHost($asciiHost);
+            }
+        }
+        return $uri;
+    }
+    /**
+     * @internal
+     */
+    public static function getenv(string $name) : ?string
+    {
+        if (isset($_SERVER[$name])) {
+            return (string) $_SERVER[$name];
+        }
+        if (\PHP_SAPI === 'cli' && ($value = \getenv($name)) !== \false && $value !== null) {
+            return (string) $value;
+        }
+        return null;
+    }
+    /**
+     * @return string|false
+     */
+    private static function idnToAsci(string $domain, int $options, ?array &$info = [])
+    {
+        if (\function_exists('idn_to_ascii') && \defined('INTL_IDNA_VARIANT_UTS46')) {
+            return \idn_to_ascii($domain, $options, \INTL_IDNA_VARIANT_UTS46, $info);
+        }
+        throw new \Error('ext-idn or symfony/polyfill-intl-idn not loaded or too old');
+    }
+}

dependencies/guzzlehttp/guzzle/src/functions.php

@@ -0,0 +1,158 @@
+<?php
+
+namespace WP_Ultimo\Dependencies\GuzzleHttp;
+
+/**
+ * Debug function used to describe the provided value type and class.
+ *
+ * @param mixed $input Any type of variable to describe the type of. This
+ *                     parameter misses a typehint because of that.
+ *
+ * @return string Returns a string containing the type of the variable and
+ *                if a class is provided, the class name.
+ *
+ * @deprecated describe_type will be removed in guzzlehttp/guzzle:8.0. Use Utils::describeType instead.
+ */
+function describe_type($input) : string
+{
+    return Utils::describeType($input);
+}
+/**
+ * Parses an array of header lines into an associative array of headers.
+ *
+ * @param iterable $lines Header lines array of strings in the following
+ *                        format: "Name: Value"
+ *
+ * @deprecated headers_from_lines will be removed in guzzlehttp/guzzle:8.0. Use Utils::headersFromLines instead.
+ */
+function headers_from_lines(iterable $lines) : array
+{
+    return Utils::headersFromLines($lines);
+}
+/**
+ * Returns a debug stream based on the provided variable.
+ *
+ * @param mixed $value Optional value
+ *
+ * @return resource
+ *
+ * @deprecated debug_resource will be removed in guzzlehttp/guzzle:8.0. Use Utils::debugResource instead.
+ */
+function debug_resource($value = null)
+{
+    return Utils::debugResource($value);
+}
+/**
+ * Chooses and creates a default handler to use based on the environment.
+ *
+ * The returned handler is not wrapped by any default middlewares.
+ *
+ * @return callable(\Psr\Http\Message\RequestInterface, array): \GuzzleHttp\Promise\PromiseInterface Returns the best handler for the given system.
+ *
+ * @throws \RuntimeException if no viable Handler is available.
+ *
+ * @deprecated choose_handler will be removed in guzzlehttp/guzzle:8.0. Use Utils::chooseHandler instead.
+ */
+function choose_handler() : callable
+{
+    return Utils::chooseHandler();
+}
+/**
+ * Get the default User-Agent string to use with Guzzle.
+ *
+ * @deprecated default_user_agent will be removed in guzzlehttp/guzzle:8.0. Use Utils::defaultUserAgent instead.
+ */
+function default_user_agent() : string
+{
+    return Utils::defaultUserAgent();
+}
+/**
+ * Returns the default cacert bundle for the current system.
+ *
+ * First, the openssl.cafile and curl.cainfo php.ini settings are checked.
+ * If those settings are not configured, then the common locations for
+ * bundles found on Red Hat, CentOS, Fedora, Ubuntu, Debian, FreeBSD, OS X
+ * and Windows are checked. If any of these file locations are found on
+ * disk, they will be utilized.
+ *
+ * Note: the result of this function is cached for subsequent calls.
+ *
+ * @throws \RuntimeException if no bundle can be found.
+ *
+ * @deprecated default_ca_bundle will be removed in guzzlehttp/guzzle:8.0. This function is not needed in PHP 5.6+.
+ */
+function default_ca_bundle() : string
+{
+    return Utils::defaultCaBundle();
+}
+/**
+ * Creates an associative array of lowercase header names to the actual
+ * header casing.
+ *
+ * @deprecated normalize_header_keys will be removed in guzzlehttp/guzzle:8.0. Use Utils::normalizeHeaderKeys instead.
+ */
+function normalize_header_keys(array $headers) : array
+{
+    return Utils::normalizeHeaderKeys($headers);
+}
+/**
+ * Returns true if the provided host matches any of the no proxy areas.
+ *
+ * This method will strip a port from the host if it is present. Each pattern
+ * can be matched with an exact match (e.g., "foo.com" == "foo.com") or a
+ * partial match: (e.g., "foo.com" == "baz.foo.com" and ".foo.com" ==
+ * "baz.foo.com", but ".foo.com" != "foo.com").
+ *
+ * Areas are matched in the following cases:
+ * 1. "*" (without quotes) always matches any hosts.
+ * 2. An exact match.
+ * 3. The area starts with "." and the area is the last part of the host. e.g.
+ *    '.mit.edu' will match any host that ends with '.mit.edu'.
+ *
+ * @param string   $host         Host to check against the patterns.
+ * @param string[] $noProxyArray An array of host patterns.
+ *
+ * @throws Exception\InvalidArgumentException
+ *
+ * @deprecated is_host_in_noproxy will be removed in guzzlehttp/guzzle:8.0. Use Utils::isHostInNoProxy instead.
+ */
+function is_host_in_noproxy(string $host, array $noProxyArray) : bool
+{
+    return Utils::isHostInNoProxy($host, $noProxyArray);
+}
+/**
+ * Wrapper for json_decode that throws when an error occurs.
+ *
+ * @param string $json    JSON data to parse
+ * @param bool   $assoc   When true, returned objects will be converted
+ *                        into associative arrays.
+ * @param int    $depth   User specified recursion depth.
+ * @param int    $options Bitmask of JSON decode options.
+ *
+ * @return object|array|string|int|float|bool|null
+ *
+ * @throws Exception\InvalidArgumentException if the JSON cannot be decoded.
+ *
+ * @see https://www.php.net/manual/en/function.json-decode.php
+ * @deprecated json_decode will be removed in guzzlehttp/guzzle:8.0. Use Utils::jsonDecode instead.
+ */
+function json_decode(string $json, bool $assoc = \false, int $depth = 512, int $options = 0)
+{
+    return Utils::jsonDecode($json, $assoc, $depth, $options);
+}
+/**
+ * Wrapper for JSON encoding that throws when an error occurs.
+ *
+ * @param mixed $value   The value being encoded
+ * @param int   $options JSON encode option bitmask
+ * @param int   $depth   Set the maximum depth. Must be greater than zero.
+ *
+ * @throws Exception\InvalidArgumentException if the JSON cannot be encoded.
+ *
+ * @see https://www.php.net/manual/en/function.json-encode.php
+ * @deprecated json_encode will be removed in guzzlehttp/guzzle:8.0. Use Utils::jsonEncode instead.
+ */
+function json_encode($value, int $options = 0, int $depth = 512) : string
+{
+    return Utils::jsonEncode($value, $options, $depth);
+}

dependencies/guzzlehttp/guzzle/src/functions_include.php

@@ -0,0 +1,8 @@
+<?php
+
+namespace WP_Ultimo\Dependencies;
+
+// Don't redefine the functions if included multiple times.
+if (!\function_exists('WP_Ultimo\\Dependencies\\GuzzleHttp\\describe_type')) {
+    require __DIR__ . '/functions.php';
+}

dependencies/guzzlehttp/promises/src/AggregateException.php

@@ -0,0 +1,14 @@
+<?php
+
+namespace WP_Ultimo\Dependencies\GuzzleHttp\Promise;
+
+/**
+ * Exception thrown when too many errors occur in the some() or any() methods.
+ */
+class AggregateException extends RejectionException
+{
+    public function __construct($msg, array $reasons)
+    {
+        parent::__construct($reasons, \sprintf('%s; %d rejected promises', $msg, \count($reasons)));
+    }
+}

dependencies/guzzlehttp/promises/src/CancellationException.php

@@ -0,0 +1,10 @@
+<?php
+
+namespace WP_Ultimo\Dependencies\GuzzleHttp\Promise;
+
+/**
+ * Exception that is set as the reason for a promise that has been cancelled.
+ */
+class CancellationException extends RejectionException
+{
+}

dependencies/guzzlehttp/promises/src/Coroutine.php

@@ -0,0 +1,151 @@
+<?php
+
+namespace WP_Ultimo\Dependencies\GuzzleHttp\Promise;
+
+use Exception;
+use Generator;
+use Throwable;
+/**
+ * Creates a promise that is resolved using a generator that yields values or
+ * promises (somewhat similar to C#'s async keyword).
+ *
+ * When called, the Coroutine::of method will start an instance of the generator
+ * and returns a promise that is fulfilled with its final yielded value.
+ *
+ * Control is returned back to the generator when the yielded promise settles.
+ * This can lead to less verbose code when doing lots of sequential async calls
+ * with minimal processing in between.
+ *
+ *     use GuzzleHttp\Promise;
+ *
+ *     function createPromise($value) {
+ *         return new Promise\FulfilledPromise($value);
+ *     }
+ *
+ *     $promise = Promise\Coroutine::of(function () {
+ *         $value = (yield createPromise('a'));
+ *         try {
+ *             $value = (yield createPromise($value . 'b'));
+ *         } catch (\Exception $e) {
+ *             // The promise was rejected.
+ *         }
+ *         yield $value . 'c';
+ *     });
+ *
+ *     // Outputs "abc"
+ *     $promise->then(function ($v) { echo $v; });
+ *
+ * @param callable $generatorFn Generator function to wrap into a promise.
+ *
+ * @return Promise
+ *
+ * @link https://github.com/petkaantonov/bluebird/blob/master/API.md#generators inspiration
+ */
+final class Coroutine implements PromiseInterface
+{
+    /**
+     * @var PromiseInterface|null
+     */
+    private $currentPromise;
+    /**
+     * @var Generator
+     */
+    private $generator;
+    /**
+     * @var Promise
+     */
+    private $result;
+    public function __construct(callable $generatorFn)
+    {
+        $this->generator = $generatorFn();
+        $this->result = new Promise(function () {
+            while (isset($this->currentPromise)) {
+                $this->currentPromise->wait();
+            }
+        });
+        try {
+            $this->nextCoroutine($this->generator->current());
+        } catch (\Exception $exception) {
+            $this->result->reject($exception);
+        } catch (Throwable $throwable) {
+            $this->result->reject($throwable);
+        }
+    }
+    /**
+     * Create a new coroutine.
+     *
+     * @return self
+     */
+    public static function of(callable $generatorFn)
+    {
+        return new self($generatorFn);
+    }
+    public function then(callable $onFulfilled = null, callable $onRejected = null)
+    {
+        return $this->result->then($onFulfilled, $onRejected);
+    }
+    public function otherwise(callable $onRejected)
+    {
+        return $this->result->otherwise($onRejected);
+    }
+    public function wait($unwrap = \true)
+    {
+        return $this->result->wait($unwrap);
+    }
+    public function getState()
+    {
+        return $this->result->getState();
+    }
+    public function resolve($value)
+    {
+        $this->result->resolve($value);
+    }
+    public function reject($reason)
+    {
+        $this->result->reject($reason);
+    }
+    public function cancel()
+    {
+        $this->currentPromise->cancel();
+        $this->result->cancel();
+    }
+    private function nextCoroutine($yielded)
+    {
+        $this->currentPromise = Create::promiseFor($yielded)->then([$this, '_handleSuccess'], [$this, '_handleFailure']);
+    }
+    /**
+     * @internal
+     */
+    public function _handleSuccess($value)
+    {
+        unset($this->currentPromise);
+        try {
+            $next = $this->generator->send($value);
+            if ($this->generator->valid()) {
+                $this->nextCoroutine($next);
+            } else {
+                $this->result->resolve($value);
+            }
+        } catch (Exception $exception) {
+            $this->result->reject($exception);
+        } catch (Throwable $throwable) {
+            $this->result->reject($throwable);
+        }
+    }
+    /**
+     * @internal
+     */
+    public function _handleFailure($reason)
+    {
+        unset($this->currentPromise);
+        try {
+            $nextYield = $this->generator->throw(Create::exceptionFor($reason));
+            // The throw was caught, so keep iterating on the coroutine
+            $this->nextCoroutine($nextYield);
+        } catch (Exception $exception) {
+            $this->result->reject($exception);
+        } catch (Throwable $throwable) {
+            $this->result->reject($throwable);
+        }
+    }
+}

dependencies/guzzlehttp/promises/src/Create.php

@@ -0,0 +1,75 @@
+<?php
+
+namespace WP_Ultimo\Dependencies\GuzzleHttp\Promise;
+
+final class Create
+{
+    /**
+     * Creates a promise for a value if the value is not a promise.
+     *
+     * @param mixed $value Promise or value.
+     *
+     * @return PromiseInterface
+     */
+    public static function promiseFor($value)
+    {
+        if ($value instanceof PromiseInterface) {
+            return $value;
+        }
+        // Return a Guzzle promise that shadows the given promise.
+        if (\is_object($value) && \method_exists($value, 'then')) {
+            $wfn = \method_exists($value, 'wait') ? [$value, 'wait'] : null;
+            $cfn = \method_exists($value, 'cancel') ? [$value, 'cancel'] : null;
+            $promise = new Promise($wfn, $cfn);
+            $value->then([$promise, 'resolve'], [$promise, 'reject']);
+            return $promise;
+        }
+        return new FulfilledPromise($value);
+    }
+    /**
+     * Creates a rejected promise for a reason if the reason is not a promise.
+     * If the provided reason is a promise, then it is returned as-is.
+     *
+     * @param mixed $reason Promise or reason.
+     *
+     * @return PromiseInterface
+     */
+    public static function rejectionFor($reason)
+    {
+        if ($reason instanceof PromiseInterface) {
+            return $reason;
+        }
+        return new RejectedPromise($reason);
+    }
+    /**
+     * Create an exception for a rejected promise value.
+     *
+     * @param mixed $reason
+     *
+     * @return \Exception|\Throwable
+     */
+    public static function exceptionFor($reason)
+    {
+        if ($reason instanceof \Exception || $reason instanceof \Throwable) {
+            return $reason;
+        }
+        return new RejectionException($reason);
+    }
+    /**
+     * Returns an iterator for the given value.
+     *
+     * @param mixed $value
+     *
+     * @return \Iterator
+     */
+    public static function iterFor($value)
+    {
+        if ($value instanceof \Iterator) {
+            return $value;
+        }
+        if (\is_array($value)) {
+            return new \ArrayIterator($value);
+        }
+        return new \ArrayIterator([$value]);
+    }
+}

dependencies/guzzlehttp/promises/src/Each.php

@@ -0,0 +1,66 @@
+<?php
+
+namespace WP_Ultimo\Dependencies\GuzzleHttp\Promise;
+
+final class Each
+{
+    /**
+     * Given an iterator that yields promises or values, returns a promise that
+     * is fulfilled with a null value when the iterator has been consumed or
+     * the aggregate promise has been fulfilled or rejected.
+     *
+     * $onFulfilled is a function that accepts the fulfilled value, iterator
+     * index, and the aggregate promise. The callback can invoke any necessary
+     * side effects and choose to resolve or reject the aggregate if needed.
+     *
+     * $onRejected is a function that accepts the rejection reason, iterator
+     * index, and the aggregate promise. The callback can invoke any necessary
+     * side effects and choose to resolve or reject the aggregate if needed.
+     *
+     * @param mixed    $iterable    Iterator or array to iterate over.
+     * @param callable $onFulfilled
+     * @param callable $onRejected
+     *
+     * @return PromiseInterface
+     */
+    public static function of($iterable, callable $onFulfilled = null, callable $onRejected = null)
+    {
+        return (new EachPromise($iterable, ['fulfilled' => $onFulfilled, 'rejected' => $onRejected]))->promise();
+    }
+    /**
+     * Like of, but only allows a certain number of outstanding promises at any
+     * given time.
+     *
+     * $concurrency may be an integer or a function that accepts the number of
+     * pending promises and returns a numeric concurrency limit value to allow
+     * for dynamic a concurrency size.
+     *
+     * @param mixed        $iterable
+     * @param int|callable $concurrency
+     * @param callable     $onFulfilled
+     * @param callable     $onRejected
+     *
+     * @return PromiseInterface
+     */
+    public static function ofLimit($iterable, $concurrency, callable $onFulfilled = null, callable $onRejected = null)
+    {
+        return (new EachPromise($iterable, ['fulfilled' => $onFulfilled, 'rejected' => $onRejected, 'concurrency' => $concurrency]))->promise();
+    }
+    /**
+     * Like limit, but ensures that no promise in the given $iterable argument
+     * is rejected. If any promise is rejected, then the aggregate promise is
+     * rejected with the encountered rejection.
+     *
+     * @param mixed        $iterable
+     * @param int|callable $concurrency
+     * @param callable     $onFulfilled
+     *
+     * @return PromiseInterface
+     */
+    public static function ofLimitAll($iterable, $concurrency, callable $onFulfilled = null)
+    {
+        return self::ofLimit($iterable, $concurrency, $onFulfilled, function ($reason, $idx, PromiseInterface $aggregate) {
+            $aggregate->reject($reason);
+        });
+    }
+}

dependencies/guzzlehttp/promises/src/EachPromise.php

@@ -0,0 +1,200 @@
+<?php
+
+namespace WP_Ultimo\Dependencies\GuzzleHttp\Promise;
+
+/**
+ * Represents a promise that iterates over many promises and invokes
+ * side-effect functions in the process.
+ */
+class EachPromise implements PromisorInterface
+{
+    private $pending = [];
+    private $nextPendingIndex = 0;
+    /** @var \Iterator|null */
+    private $iterable;
+    /** @var callable|int|null */
+    private $concurrency;
+    /** @var callable|null */
+    private $onFulfilled;
+    /** @var callable|null */
+    private $onRejected;
+    /** @var Promise|null */
+    private $aggregate;
+    /** @var bool|null */
+    private $mutex;
+    /**
+     * Configuration hash can include the following key value pairs:
+     *
+     * - fulfilled: (callable) Invoked when a promise fulfills. The function
+     *   is invoked with three arguments: the fulfillment value, the index
+     *   position from the iterable list of the promise, and the aggregate
+     *   promise that manages all of the promises. The aggregate promise may
+     *   be resolved from within the callback to short-circuit the promise.
+     * - rejected: (callable) Invoked when a promise is rejected. The
+     *   function is invoked with three arguments: the rejection reason, the
+     *   index position from the iterable list of the promise, and the
+     *   aggregate promise that manages all of the promises. The aggregate
+     *   promise may be resolved from within the callback to short-circuit
+     *   the promise.
+     * - concurrency: (integer) Pass this configuration option to limit the
+     *   allowed number of outstanding concurrently executing promises,
+     *   creating a capped pool of promises. There is no limit by default.
+     *
+     * @param mixed $iterable Promises or values to iterate.
+     * @param array $config   Configuration options
+     */
+    public function __construct($iterable, array $config = [])
+    {
+        $this->iterable = Create::iterFor($iterable);
+        if (isset($config['concurrency'])) {
+            $this->concurrency = $config['concurrency'];
+        }
+        if (isset($config['fulfilled'])) {
+            $this->onFulfilled = $config['fulfilled'];
+        }
+        if (isset($config['rejected'])) {
+            $this->onRejected = $config['rejected'];
+        }
+    }
+    /** @psalm-suppress InvalidNullableReturnType */
+    public function promise()
+    {
+        if ($this->aggregate) {
+            return $this->aggregate;
+        }
+        try {
+            $this->createPromise();
+            /** @psalm-assert Promise $this->aggregate */
+            $this->iterable->rewind();
+            $this->refillPending();
+        } catch (\Throwable $e) {
+            $this->aggregate->reject($e);
+        } catch (\Exception $e) {
+            $this->aggregate->reject($e);
+        }
+        /**
+         * @psalm-suppress NullableReturnStatement
+         * @phpstan-ignore-next-line
+         */
+        return $this->aggregate;
+    }
+    private function createPromise()
+    {
+        $this->mutex = \false;
+        $this->aggregate = new Promise(function () {
+            if ($this->checkIfFinished()) {
+                return;
+            }
+            \reset($this->pending);
+            // Consume a potentially fluctuating list of promises while
+            // ensuring that indexes are maintained (precluding array_shift).
+            while ($promise = \current($this->pending)) {
+                \next($this->pending);
+                $promise->wait();
+                if (Is::settled($this->aggregate)) {
+                    return;
+                }
+            }
+        });
+        // Clear the references when the promise is resolved.
+        $clearFn = function () {
+            $this->iterable = $this->concurrency = $this->pending = null;
+            $this->onFulfilled = $this->onRejected = null;
+            $this->nextPendingIndex = 0;
+        };
+        $this->aggregate->then($clearFn, $clearFn);
+    }
+    private function refillPending()
+    {
+        if (!$this->concurrency) {
+            // Add all pending promises.
+            while ($this->addPending() && $this->advanceIterator()) {
+            }
+            return;
+        }
+        // Add only up to N pending promises.
+        $concurrency = \is_callable($this->concurrency) ? \call_user_func($this->concurrency, \count($this->pending)) : $this->concurrency;
+        $concurrency = \max($concurrency - \count($this->pending), 0);
+        // Concurrency may be set to 0 to disallow new promises.
+        if (!$concurrency) {
+            return;
+        }
+        // Add the first pending promise.
+        $this->addPending();
+        // Note this is special handling for concurrency=1 so that we do
+        // not advance the iterator after adding the first promise. This
+        // helps work around issues with generators that might not have the
+        // next value to yield until promise callbacks are called.
+        while (--$concurrency && $this->advanceIterator() && $this->addPending()) {
+        }
+    }
+    private function addPending()
+    {
+        if (!$this->iterable || !$this->iterable->valid()) {
+            return \false;
+        }
+        $promise = Create::promiseFor($this->iterable->current());
+        $key = $this->iterable->key();
+        // Iterable keys may not be unique, so we use a counter to
+        // guarantee uniqueness
+        $idx = $this->nextPendingIndex++;
+        $this->pending[$idx] = $promise->then(function ($value) use($idx, $key) {
+            if ($this->onFulfilled) {
+                \call_user_func($this->onFulfilled, $value, $key, $this->aggregate);
+            }
+            $this->step($idx);
+        }, function ($reason) use($idx, $key) {
+            if ($this->onRejected) {
+                \call_user_func($this->onRejected, $reason, $key, $this->aggregate);
+            }
+            $this->step($idx);
+        });
+        return \true;
+    }
+    private function advanceIterator()
+    {
+        // Place a lock on the iterator so that we ensure to not recurse,
+        // preventing fatal generator errors.
+        if ($this->mutex) {
+            return \false;
+        }
+        $this->mutex = \true;
+        try {
+            $this->iterable->next();
+            $this->mutex = \false;
+            return \true;
+        } catch (\Throwable $e) {
+            $this->aggregate->reject($e);
+            $this->mutex = \false;
+            return \false;
+        } catch (\Exception $e) {
+            $this->aggregate->reject($e);
+            $this->mutex = \false;
+            return \false;
+        }
+    }
+    private function step($idx)
+    {
+        // If the promise was already resolved, then ignore this step.
+        if (Is::settled($this->aggregate)) {
+            return;
+        }
+        unset($this->pending[$idx]);
+        // Only refill pending promises if we are not locked, preventing the
+        // EachPromise to recursively invoke the provided iterator, which
+        // cause a fatal error: "Cannot resume an already running generator"
+        if ($this->advanceIterator() && !$this->checkIfFinished()) {
+            // Add more pending promises if possible.
+            $this->refillPending();
+        }
+    }
+    private function checkIfFinished()
+    {
+        if (!$this->pending && !$this->iterable->valid()) {
+            // Resolve the promise if there's nothing left to do.
+            $this->aggregate->resolve(null);
+            return \true;
+        }
+        return \false;
+    }
+}

dependencies/guzzlehttp/promises/src/FulfilledPromise.php

@@ -0,0 +1,69 @@
+<?php
+
+namespace WP_Ultimo\Dependencies\GuzzleHttp\Promise;
+
+/**
+ * A promise that has been fulfilled.
+ *
+ * Thenning off of this promise will invoke the onFulfilled callback
+ * immediately and ignore other callbacks.
+ */
+class FulfilledPromise implements PromiseInterface
+{
+    private $value;
+    public function __construct($value)
+    {
+        if (\is_object($value) && \method_exists($value, 'then')) {
+            throw new \InvalidArgumentException('You cannot create a FulfilledPromise with a promise.');
+        }
+        $this->value = $value;
+    }
+    public function then(callable $onFulfilled = null, callable $onRejected = null)
+    {
+        // Return itself if there is no onFulfilled function.
+        if (!$onFulfilled) {
+            return $this;
+        }
+        $queue = Utils::queue();
+        $p = new Promise([$queue, 'run']);
+        $value = $this->value;
+        $queue->add(static function () use($p, $value, $onFulfilled) {
+            if (Is::pending($p)) {
+                try {
+                    $p->resolve($onFulfilled($value));
+                } catch (\Throwable $e) {
+                    $p->reject($e);
+                } catch (\Exception $e) {
+                    $p->reject($e);
+                }
+            }
+        });
+        return $p;
+    }
+    public function otherwise(callable $onRejected)
+    {
+        return $this->then(null, $onRejected);
+    }
+    public function wait($unwrap = \true, $defaultDelivery = null)
+    {
+        return $unwrap ? $this->value : null;
+    }
+    public function getState()
+    {
+        return self::FULFILLED;
+    }
+    public function resolve($value)
+    {
+        if ($value !== $this->value) {
+            throw new \LogicException("Cannot resolve a fulfilled promise");
+        }
+    }
+    public function reject($reason)
+    {
+        throw new \LogicException("Cannot reject a fulfilled promise");
+    }
+    public function cancel()
+    {
+        // pass
+    }
+}

dependencies/guzzlehttp/promises/src/Is.php

@@ -0,0 +1,43 @@
+<?php
+
+namespace WP_Ultimo\Dependencies\GuzzleHttp\Promise;
+
+final class Is
+{
+    /**
+     * Returns true if a promise is pending.
+     *
+     * @return bool
+     */
+    public static function pending(PromiseInterface $promise)
+    {
+        return $promise->getState() === PromiseInterface::PENDING;
+    }
+    /**
+     * Returns true if a promise is fulfilled or rejected.
+     *
+     * @return bool
+     */
+    public static function settled(PromiseInterface $promise)
+    {
+        return $promise->getState() !== PromiseInterface::PENDING;
+    }
+    /**
+     * Returns true if a promise is fulfilled.
+     *
+     * @return bool
+     */
+    public static function fulfilled(PromiseInterface $promise)
+    {
+        return $promise->getState() === PromiseInterface::FULFILLED;
+    }
+    /**
+     * Returns true if a promise is rejected.
+     *
+     * @return bool
+     */
+    public static function rejected(PromiseInterface $promise)
+    {
+        return $promise->getState() === PromiseInterface::REJECTED;
+    }
+}

dependencies/guzzlehttp/promises/src/Promise.php

@@ -0,0 +1,237 @@
+<?php
+
+namespace WP_Ultimo\Dependencies\GuzzleHttp\Promise;
+
+/**
+ * Promises/A+ implementation that avoids recursion when possible.
+ *
+ * @link https://promisesaplus.com/
+ */
+class Promise implements PromiseInterface
+{
+    private $state = self::PENDING;
+    private $result;
+    private $cancelFn;
+    private $waitFn;
+    private $waitList;
+    private $handlers = [];
+    /**
+     * @param callable $waitFn   Fn that when invoked resolves the promise.
+     * @param callable $cancelFn Fn that when invoked cancels the promise.
+     */
+    public function __construct(callable $waitFn = null, callable $cancelFn = null)
+    {
+        $this->waitFn = $waitFn;
+        $this->cancelFn = $cancelFn;
+    }
+    public function then(callable $onFulfilled = null, callable $onRejected = null)
+    {
+        if ($this->state === self::PENDING) {
+            $p = new Promise(null, [$this, 'cancel']);
+            $this->handlers[] = [$p, $onFulfilled, $onRejected];
+            $p->waitList = $this->waitList;
+            $p->waitList[] = $this;
+            return $p;
+        }
+        // Return a fulfilled promise and immediately invoke any callbacks.
+        if ($this->state === self::FULFILLED) {
+            $promise = Create::promiseFor($this->result);
+            return $onFulfilled ? $promise->then($onFulfilled) : $promise;
+        }
+        // It's either cancelled or rejected, so return a rejected promise
+        // and immediately invoke any callbacks.
+        $rejection = Create::rejectionFor($this->result);
+        return $onRejected ? $rejection->then(null, $onRejected) : $rejection;
+    }
+    public function otherwise(callable $onRejected)
+    {
+        return $this->then(null, $onRejected);
+    }
+    public function wait($unwrap = \true)
+    {
+        $this->waitIfPending();
+        if ($this->result instanceof PromiseInterface) {
+            return $this->result->wait($unwrap);
+        }
+        if ($unwrap) {
+            if ($this->state === self::FULFILLED) {
+                return $this->result;
+            }
+            // It's rejected so "unwrap" and throw an exception.
+            throw Create::exceptionFor($this->result);
+        }
+    }
+    public function getState()
+    {
+        return $this->state;
+    }
+    public function cancel()
+    {
+        if ($this->state !== self::PENDING) {
+            return;
+        }
+        $this->waitFn = $this->waitList = null;
+        if ($this->cancelFn) {
+            $fn = $this->cancelFn;
+            $this->cancelFn = null;
+            try {
+                $fn();
+            } catch (\Throwable $e) {
+                $this->reject($e);
+            } catch (\Exception $e) {
+                $this->reject($e);
+            }
+        }
+        // Reject the promise only if it wasn't rejected in a then callback.
+        /** @psalm-suppress RedundantCondition */
+        if ($this->state === self::PENDING) {
+            $this->reject(new CancellationException('Promise has been cancelled'));
+        }
+    }
+    public function resolve($value)
+    {
+        $this->settle(self::FULFILLED, $value);
+    }
+    public function reject($reason)
+    {
+        $this->settle(self::REJECTED, $reason);
+    }
+    private function settle($state, $value)
+    {
+        if ($this->state !== self::PENDING) {
+            // Ignore calls with the same resolution.
+            if ($state === $this->state && $value === $this->result) {
+                return;
+            }
+            throw $this->state === $state ? new \LogicException("The promise is already {$state}.") : new \LogicException("Cannot change a {$this->state} promise to {$state}");
+        }
+        if ($value === $this) {
+            throw new \LogicException('Cannot fulfill or reject a promise with itself');
+        }
+        // Clear out the state of the promise but stash the handlers.
+        $this->state = $state;
+        $this->result = $value;
+        $handlers = $this->handlers;
+        $this->handlers = null;
+        $this->waitList = $this->waitFn = null;
+        $this->cancelFn = null;
+        if (!$handlers) {
+            return;
+        }
+        // If the value was not a settled promise or a thenable, then resolve
+        // it in the task queue using the correct ID.
+        if (!\is_object($value) || !\method_exists($value, 'then')) {
+            $id = $state === self::FULFILLED ? 1 : 2;
+            // It's a success, so resolve the handlers in the queue.
+            Utils::queue()->add(static function () use($id, $value, $handlers) {
+                foreach ($handlers as $handler) {
+                    self::callHandler($id, $value, $handler);
+                }
+            });
+        } elseif ($value instanceof Promise && Is::pending($value)) {
+            // We can just merge our handlers onto the next promise.
+            $value->handlers = \array_merge($value->handlers, $handlers);
+        } else {
+            // Resolve the handlers when the forwarded promise is resolved.
+            $value->then(static function ($value) use($handlers) {
+                foreach ($handlers as $handler) {
+                    self::callHandler(1, $value, $handler);
+                }
+            }, static function ($reason) use($handlers) {
+                foreach ($handlers as $handler) {
+                    self::callHandler(2, $reason, $handler);
+                }
+            });
+        }
+    }
+    /**
+     * Call a stack of handlers using a specific callback index and value.
+     *
+     * @param int   $index   1 (resolve) or 2 (reject).
+     * @param mixed $value   Value to pass to the callback.
+     * @param array $handler Array of handler data (promise and callbacks).
+     */
+    private static function callHandler($index, $value, array $handler)
+    {
+        /** @var PromiseInterface $promise */
+        $promise = $handler[0];
+        // The promise may have been cancelled or resolved before placing
+        // this thunk in the queue.
+        if (Is::settled($promise)) {
+            return;
+        }
+        try {
+            if (isset($handler[$index])) {
+                /*
+                 * If $f throws an exception, then $handler will be in the exception
+                 * stack trace. Since $handler contains a reference to the callable
+                 * itself we get a circular reference. We clear the $handler
+                 * here to avoid that memory leak.
+                 */
+                $f = $handler[$index];
+                unset($handler);
+                $promise->resolve($f($value));
+            } elseif ($index === 1) {
+                // Forward resolution values as-is.
+                $promise->resolve($value);
+            } else {
+                // Forward rejections down the chain.
+                $promise->reject($value);
+            }
+        } catch (\Throwable $reason) {
+            $promise->reject($reason);
+        } catch (\Exception $reason) {
+            $promise->reject($reason);
+        }
+    }
+    private function waitIfPending()
+    {
+        if ($this->state !== self::PENDING) {
+            return;
+        } elseif ($this->waitFn) {
+            $this->invokeWaitFn();
+        } elseif ($this->waitList) {
+            $this->invokeWaitList();
+        } else {
+            // If there's no wait function, then reject the promise.
+            $this->reject('Cannot wait on a promise that has ' . 'no internal wait function. You must provide a wait ' . 'function when constructing the promise to be able to ' . 'wait on a promise.');
+        }
+        Utils::queue()->run();
+        /** @psalm-suppress RedundantCondition */
+        if ($this->state === self::PENDING) {
+            $this->reject('Invoking the wait callback did not resolve the promise');
+        }
+    }
+    private function invokeWaitFn()
+    {
+        try {
+            $wfn = $this->waitFn;
+            $this->waitFn = null;
+            $wfn(\true);
+        } catch (\Exception $reason) {
+            if ($this->state === self::PENDING) {
+                // The promise has not been resolved yet, so reject the promise
+                // with the exception.
+                $this->reject($reason);
+            } else {
+                // The promise was already resolved, so there's a problem in
+                // the application.
+                throw $reason;
+            }
+        }
+    }
+    private function invokeWaitList()
+    {
+        $waitList = $this->waitList;
+        $this->waitList = null;
+        foreach ($waitList as $result) {
+            do {
+                $result->waitIfPending();
+                $result = $result->result;
+            } while ($result instanceof Promise);
+            if ($result instanceof PromiseInterface) {
+                $result->wait(\false);
+            }
+        }
+    }
+}

dependencies/guzzlehttp/promises/src/PromiseInterface.php

@@ -0,0 +1,87 @@
+<?php
+
+namespace WP_Ultimo\Dependencies\GuzzleHttp\Promise;
+
+/**
+ * A promise represents the eventual result of an asynchronous operation.
+ *
+ * The primary way of interacting with a promise is through its then method,
+ * which registers callbacks to receive either a promise’s eventual value or
+ * the reason why the promise cannot be fulfilled.
+ *
+ * @link https://promisesaplus.com/
+ */
+interface PromiseInterface
+{
+    const PENDING = 'pending';
+    const FULFILLED = 'fulfilled';
+    const REJECTED = 'rejected';
+    /**
+     * Appends fulfillment and rejection handlers to the promise, and returns
+     * a new promise resolving to the return value of the called handler.
+     *
+     * @param callable $onFulfilled Invoked when the promise fulfills.
+     * @param callable $onRejected  Invoked when the promise is rejected.
+     *
+     * @return PromiseInterface
+     */
+    public function then(callable $onFulfilled = null, callable $onRejected = null);
+    /**
+     * Appends a rejection handler callback to the promise, and returns a new
+     * promise resolving to the return value of the callback if it is called,
+     * or to its original fulfillment value if the promise is instead
+     * fulfilled.
+     *
+     * @param callable $onRejected Invoked when the promise is rejected.
+     *
+     * @return PromiseInterface
+     */
+    public function otherwise(callable $onRejected);
+    /**
+     * Get the state of the promise ("pending", "rejected", or "fulfilled").
+     *
+     * The three states can be checked against the constants defined on
+     * PromiseInterface: PENDING, FULFILLED, and REJECTED.
+     *
+     * @return string
+     */
+    public function getState();
+    /**
+     * Resolve the promise with the given value.
+     *
+     * @param mixed $value
+     *
+     * @throws \RuntimeException if the promise is already resolved.
+     */
+    public function resolve($value);
+    /**
+     * Reject the promise with the given reason.
+     *
+     * @param mixed $reason
+     *
+     * @throws \RuntimeException if the promise is already resolved.
+     */
+    public function reject($reason);
+    /**
+     * Cancels the promise if possible.
+     *
+     * @link https://github.com/promises-aplus/cancellation-spec/issues/7
+     */
+    public function cancel();
+    /**
+     * Waits until the promise completes if possible.
+     *
+     * Pass $unwrap as true to unwrap the result of the promise, either
+     * returning the resolved value or throwing the rejected exception.
+     *
+     * If the promise cannot be waited on, then the promise will be rejected.
+     *
+     * @param bool $unwrap
+     *
+     * @return mixed
+     *
+     * @throws \LogicException if the promise has no wait function or if the
+     *                         promise does not settle after waiting.
+     */
+    public function wait($unwrap = \true);
+}

dependencies/guzzlehttp/promises/src/PromisorInterface.php

@@ -0,0 +1,16 @@
+<?php
+
+namespace WP_Ultimo\Dependencies\GuzzleHttp\Promise;
+
+/**
+ * Interface used with classes that return a promise.
+ */
+interface PromisorInterface
+{
+    /**
+     * Returns a promise.
+     *
+     * @return PromiseInterface
+     */
+    public function promise();
+}

dependencies/guzzlehttp/promises/src/RejectedPromise.php

@@ -0,0 +1,75 @@
+<?php
+
+namespace WP_Ultimo\Dependencies\GuzzleHttp\Promise;
+
+/**
+ * A promise that has been rejected.
+ *
+ * Thenning off of this promise will invoke the onRejected callback
+ * immediately and ignore other callbacks.
+ */
+class RejectedPromise implements PromiseInterface
+{
+    private $reason;
+    public function __construct($reason)
+    {
+        if (\is_object($reason) && \method_exists($reason, 'then')) {
+            throw new \InvalidArgumentException('You cannot create a RejectedPromise with a promise.');
+        }
+        $this->reason = $reason;
+    }
+    public function then(callable $onFulfilled = null, callable $onRejected = null)
+    {
+        // If there's no onRejected callback then just return self.
+        if (!$onRejected) {
+            return $this;
+        }
+        $queue = Utils::queue();
+        $reason = $this->reason;
+        $p = new Promise([$queue, 'run']);
+        $queue->add(static function () use($p, $reason, $onRejected) {
+            if (Is::pending($p)) {
+                try {
+                    // Return a resolved promise if onRejected does not throw.
+                    $p->resolve($onRejected($reason));
+                } catch (\Throwable $e) {
+                    // onRejected threw, so return a rejected promise.
+                    $p->reject($e);
+                } catch (\Exception $e) {
+                    // onRejected threw, so return a rejected promise.
+                    $p->reject($e);
+                }
+            }
+        });
+        return $p;
+    }
+    public function otherwise(callable $onRejected)
+    {
+        return $this->then(null, $onRejected);
+    }
+    public function wait($unwrap = \true, $defaultDelivery = null)
+    {
+        if ($unwrap) {
+            throw Create::exceptionFor($this->reason);
+        }
+        return null;
+    }
+    public function getState()
+    {
+        return self::REJECTED;
+    }
+    public function resolve($value)
+    {
+        throw new \LogicException("Cannot resolve a rejected promise");
+    }
+    public function reject($reason)
+    {
+        if ($reason !== $this->reason) {
+            throw new \LogicException("Cannot reject a rejected promise");
+        }
+    }
+    public function cancel()
+    {
+        // pass
+    }
+}

dependencies/guzzlehttp/promises/src/RejectionException.php

@@ -0,0 +1,40 @@
+<?php
+
+namespace WP_Ultimo\Dependencies\GuzzleHttp\Promise;
+
+/**
+ * A special exception that is thrown when waiting on a rejected promise.
+ *
+ * The reason value is available via the getReason() method.
+ */
+class RejectionException extends \RuntimeException
+{
+    /** @var mixed Rejection reason. */
+    private $reason;
+    /**
+     * @param mixed  $reason      Rejection reason.
+     * @param string $description Optional description
+     */
+    public function __construct($reason, $description = null)
+    {
+        $this->reason = $reason;
+        $message = 'The promise was rejected';
+        if ($description) {
+            $message .= ' with reason: ' . $description;
+        } elseif (\is_string($reason) || \is_object($reason) && \method_exists($reason, '__toString')) {
+            $message .= ' with reason: ' . $this->reason;
+        } elseif ($reason instanceof \JsonSerializable) {
+            $message .= ' with reason: ' . \json_encode($this->reason, \JSON_PRETTY_PRINT);
+        }
+        parent::__construct($message);
+    }
+    /**
+     * Returns the rejection reason.
+     *
+     * @return mixed
+     */
+    public function getReason()
+    {
+        return $this->reason;
+    }
+}

dependencies/guzzlehttp/promises/src/TaskQueue.php

@@ -0,0 +1,62 @@
+<?php
+
+namespace WP_Ultimo\Dependencies\GuzzleHttp\Promise;
+
+/**
+ * A task queue that executes tasks in a FIFO order.
+ *
+ * This task queue class is used to settle promises asynchronously and
+ * maintains a constant stack size. You can use the task queue asynchronously
+ * by calling the `run()` function of the global task queue in an event loop.
+ *
+ *     GuzzleHttp\Promise\Utils::queue()->run();
+ */
+class TaskQueue implements TaskQueueInterface
+{
+    private $enableShutdown = \true;
+    private $queue = [];
+    public function __construct($withShutdown = \true)
+    {
+        if ($withShutdown) {
+            \register_shutdown_function(function () {
+                if ($this->enableShutdown) {
+                    // Only run the tasks if an E_ERROR didn't occur.
+                    $err = \error_get_last();
+                    if (!$err || $err['type'] ^ \E_ERROR) {
+                        $this->run();
+                    }
+                }
+            });
+        }
+    }
+    public function isEmpty()
+    {
+        return !$this->queue;
+    }
+    public function add(callable $task)
+    {
+        $this->queue[] = $task;
+    }
+    public function run()
+    {
+        while ($task = \array_shift($this->queue)) {
+            /** @var callable $task */
+            $task();
+        }
+    }
+    /**
+     * The task queue will be run and exhausted by default when the process
+     * exits IFF the exit is not the result of a PHP E_ERROR error.
+     *
+     * You can disable running the automatic shutdown of the queue by calling
+     * this function. If you disable the task queue shutdown process, then you
+     * MUST either run the task queue (as a result of running your event loop
+     * or manually using the run() method) or wait on each outstanding promise.
+     *
+     * Note: This shutdown will occur before any destructors are triggered.
+     */
+    public function disableShutdown()
+    {
+        $this->enableShutdown = \false;
+    }
+}

dependencies/guzzlehttp/promises/src/TaskQueueInterface.php

@@ -0,0 +1,22 @@
+<?php
+
+namespace WP_Ultimo\Dependencies\GuzzleHttp\Promise;
+
+interface TaskQueueInterface
+{
+    /**
+     * Returns true if the queue is empty.
+     *
+     * @return bool
+     */
+    public function isEmpty();
+    /**
+     * Adds a task to the queue that will be executed the next time run is
+     * called.
+     */
+    public function add(callable $task);
+    /**
+     * Execute all of the pending task in the queue.
+     */
+    public function run();
+}

dependencies/guzzlehttp/promises/src/Utils.php

@@ -0,0 +1,239 @@
+<?php
+
+namespace WP_Ultimo\Dependencies\GuzzleHttp\Promise;
+
+final class Utils
+{
+    /**
+     * Get the global task queue used for promise resolution.
+     *
+     * This task queue MUST be run in an event loop in order for promises to be
+     * settled asynchronously. It will be automatically run when synchronously
+     * waiting on a promise.
+     *
+     * <code>
+     * while ($eventLoop->isRunning()) {
+     *     GuzzleHttp\Promise\Utils::queue()->run();
+     * }
+     * </code>
+     *
+     * @param TaskQueueInterface $assign Optionally specify a new queue instance.
+     *
+     * @return TaskQueueInterface
+     */
+    public static function queue(TaskQueueInterface $assign = null)
+    {
+        static $queue;
+        if ($assign) {
+            $queue = $assign;
+        } elseif (!$queue) {
+            $queue = new TaskQueue();
+        }
+        return $queue;
+    }
+    /**
+     * Adds a function to run in the task queue when it is next `run()` and
+     * returns a promise that is fulfilled or rejected with the result.
+     *
+     * @param callable $task Task function to run.
+     *
+     * @return PromiseInterface
+     */
+    public static function task(callable $task)
+    {
+        $queue = self::queue();
+        $promise = new Promise([$queue, 'run']);
+        $queue->add(function () use($task, $promise) {
+            try {
+                if (Is::pending($promise)) {
+                    $promise->resolve($task());
+                }
+            } catch (\Throwable $e) {
+                $promise->reject($e);
+            } catch (\Exception $e) {
+                $promise->reject($e);
+            }
+        });
+        return $promise;
+    }
+    /**
+     * Synchronously waits on a promise to resolve and returns an inspection
+     * state array.
+     *
+     * Returns a state associative array containing a "state" key mapping to a
+     * valid promise state. If the state of the promise is "fulfilled", the
+     * array will contain a "value" key mapping to the fulfilled value of the
+     * promise. If the promise is rejected, the array will contain a "reason"
+     * key mapping to the rejection reason of the promise.
+     *
+     * @param PromiseInterface $promise Promise or value.
+     *
+     * @return array
+     */
+    public static function inspect(PromiseInterface $promise)
+    {
+        try {
+            return ['state' => PromiseInterface::FULFILLED, 'value' => $promise->wait()];
+        } catch (RejectionException $e) {
+            return ['state' => PromiseInterface::REJECTED, 'reason' => $e->getReason()];
+        } catch (\Throwable $e) {
+            return ['state' => PromiseInterface::REJECTED, 'reason' => $e];
+        } catch (\Exception $e) {
+            return ['state' => PromiseInterface::REJECTED, 'reason' => $e];
+        }
+    }
+    /**
+     * Waits on all of the provided promises, but does not unwrap rejected
+     * promises as thrown exception.
+     *
+     * Returns an array of inspection state arrays.
+     *
+     * @see inspect for the inspection state array format.
+     *
+     * @param PromiseInterface[] $promises Traversable of promises to wait upon.
+     *
+     * @return array
+     */
+    public static function inspectAll($promises)
+    {
+        $results = [];
+        foreach ($promises as $key => $promise) {
+            $results[$key] = self::inspect($promise);
+        }
+        return $results;
+    }
+    /**
+     * Waits on all of the provided promises and returns the fulfilled values.
+     *
+     * Returns an array that contains the value of each promise (in the same
+     * order the promises were provided). An exception is thrown if any of the
+     * promises are rejected.
+     *
+     * @param iterable<PromiseInterface> $promises Iterable of PromiseInterface objects to wait on.
+     *
+     * @return array
+     *
+     * @throws \Exception on error
+     * @throws \Throwable on error in PHP >=7
+     */
+    public static function unwrap($promises)
+    {
+        $results = [];
+        foreach ($promises as $key => $promise) {
+            $results[$key] = $promise->wait();
+        }
+        return $results;
+    }
+    /**
+     * Given an array of promises, return a promise that is fulfilled when all
+     * the items in the array are fulfilled.
+     *
+     * The promise's fulfillment value is an array with fulfillment values at
+     * respective positions to the original array. If any promise in the array
+     * rejects, the returned promise is rejected with the rejection reason.
+     *
+     * @param mixed $promises  Promises or values.
+     * @param bool  $recursive If true, resolves new promises that might have been added to the stack during its own resolution.
+     *
+     * @return PromiseInterface
+     */
+    public static function all($promises, $recursive = \false)
+    {
+        $results = [];
+        $promise = Each::of($promises, function ($value, $idx) use(&$results) {
+            $results[$idx] = $value;
+        }, function ($reason, $idx, Promise $aggregate) {
+            $aggregate->reject($reason);
+        })->then(function () use(&$results) {
+            \ksort($results);
+            return $results;
+        });
+        if (\true === $recursive) {
+            $promise = $promise->then(function ($results) use($recursive, &$promises) {
+                foreach ($promises as $promise) {
+                    if (Is::pending($promise)) {
+                        return self::all($promises, $recursive);
+                    }
+                }
+                return $results;
+            });
+        }
+        return $promise;
+    }
+    /**
+     * Initiate a competitive race between multiple promises or values (values
+     * will become immediately fulfilled promises).
+     *
+     * When count amount of promises have been fulfilled, the returned promise
+     * is fulfilled with an array that contains the fulfillment values of the
+     * winners in order of resolution.
+     *
+     * This promise is rejected with a {@see AggregateException} if the number
+     * of fulfilled promises is less than the desired $count.
+     *
+     * @param int   $count    Total number of promises.
+     * @param mixed $promises Promises or values.
+     *
+     * @return PromiseInterface
+     */
+    public static function some($count, $promises)
+    {
+        $results = [];
+        $rejections = [];
+        return Each::of($promises, function ($value, $idx, PromiseInterface $p) use(&$results, $count) {
+            if (Is::settled($p)) {
+                return;
+            }
+            $results[$idx] = $value;
+            if (\count($results) >= $count) {
+                $p->resolve(null);
+            }
+        }, function ($reason) use(&$rejections) {
+            $rejections[] = $reason;
+        })->then(function () use(&$results, &$rejections, $count) {
+            if (\count($results) !== $count) {
+                throw new AggregateException('Not enough promises to fulfill count', $rejections);
+            }
+            \ksort($results);
+            return \array_values($results);
+        });
+    }
+    /**
+     * Like some(), with 1 as count. However, if the promise fulfills, the
+     * fulfillment value is not an array of 1 but the value directly.
+     *
+     * @param mixed $promises Promises or values.
+     *
+     * @return PromiseInterface
+     */
+    public static function any($promises)
+    {
+        return self::some(1, $promises)->then(function ($values) {
+            return $values[0];
+        });
+    }
+    /**
+     * Returns a promise that is fulfilled when all of the provided promises have
+     * been fulfilled or rejected.
+     *
+     * The returned promise is fulfilled with an array of inspection state arrays.
+     *
+     * @see inspect for the inspection state array format.
+     *
+     * @param mixed $promises Promises or values.
+     *
+     * @return PromiseInterface
+     */
+    public static function settle($promises)
+    {
+        $results = [];
+        return Each::of($promises, function ($value, $idx) use(&$results) {
+            $results[$idx] = ['state' => PromiseInterface::FULFILLED, 'value' => $value];
+        }, function ($reason, $idx) use(&$results) {
+            $results[$idx] = ['state' => PromiseInterface::REJECTED, 'reason' => $reason];
+        })->then(function () use(&$results) {
+            \ksort($results);
+            return $results;
+        });
+    }
+}

dependencies/guzzlehttp/promises/src/functions.php

@@ -0,0 +1,334 @@
+<?php
+
+namespace WP_Ultimo\Dependencies\GuzzleHttp\Promise;
+
+/**
+ * Get the global task queue used for promise resolution.
+ *
+ * This task queue MUST be run in an event loop in order for promises to be
+ * settled asynchronously. It will be automatically run when synchronously
+ * waiting on a promise.
+ *
+ * <code>
+ * while ($eventLoop->isRunning()) {
+ *     GuzzleHttp\Promise\queue()->run();
+ * }
+ * </code>
+ *
+ * @param TaskQueueInterface $assign Optionally specify a new queue instance.
+ *
+ * @return TaskQueueInterface
+ *
+ * @deprecated queue will be removed in guzzlehttp/promises:2.0. Use Utils::queue instead.
+ */
+function queue(TaskQueueInterface $assign = null)
+{
+    return Utils::queue($assign);
+}
+/**
+ * Adds a function to run in the task queue when it is next `run()` and returns
+ * a promise that is fulfilled or rejected with the result.
+ *
+ * @param callable $task Task function to run.
+ *
+ * @return PromiseInterface
+ *
+ * @deprecated task will be removed in guzzlehttp/promises:2.0. Use Utils::task instead.
+ */
+function task(callable $task)
+{
+    return Utils::task($task);
+}
+/**
+ * Creates a promise for a value if the value is not a promise.
+ *
+ * @param mixed $value Promise or value.
+ *
+ * @return PromiseInterface
+ *
+ * @deprecated promise_for will be removed in guzzlehttp/promises:2.0. Use Create::promiseFor instead.
+ */
+function promise_for($value)
+{
+    return Create::promiseFor($value);
+}
+/**
+ * Creates a rejected promise for a reason if the reason is not a promise. If
+ * the provided reason is a promise, then it is returned as-is.
+ *
+ * @param mixed $reason Promise or reason.
+ *
+ * @return PromiseInterface
+ *
+ * @deprecated rejection_for will be removed in guzzlehttp/promises:2.0. Use Create::rejectionFor instead.
+ */
+function rejection_for($reason)
+{
+    return Create::rejectionFor($reason);
+}
+/**
+ * Create an exception for a rejected promise value.
+ *
+ * @param mixed $reason
+ *
+ * @return \Exception|\Throwable
+ *
+ * @deprecated exception_for will be removed in guzzlehttp/promises:2.0. Use Create::exceptionFor instead.
+ */
+function exception_for($reason)
+{
+    return Create::exceptionFor($reason);
+}
+/**
+ * Returns an iterator for the given value.
+ *
+ * @param mixed $value
+ *
+ * @return \Iterator
+ *
+ * @deprecated iter_for will be removed in guzzlehttp/promises:2.0. Use Create::iterFor instead.
+ */
+function iter_for($value)
+{
+    return Create::iterFor($value);
+}
+/**
+ * Synchronously waits on a promise to resolve and returns an inspection state
+ * array.
+ *
+ * Returns a state associative array containing a "state" key mapping to a
+ * valid promise state. If the state of the promise is "fulfilled", the array
+ * will contain a "value" key mapping to the fulfilled value of the promise. If
+ * the promise is rejected, the array will contain a "reason" key mapping to
+ * the rejection reason of the promise.
+ *
+ * @param PromiseInterface $promise Promise or value.
+ *
+ * @return array
+ *
+ * @deprecated inspect will be removed in guzzlehttp/promises:2.0. Use Utils::inspect instead.
+ */
+function inspect(PromiseInterface $promise)
+{
+    return Utils::inspect($promise);
+}
+/**
+ * Waits on all of the provided promises, but does not unwrap rejected promises
+ * as thrown exception.
+ *
+ * Returns an array of inspection state arrays.
+ *
+ * @see inspect for the inspection state array format.
+ *
+ * @param PromiseInterface[] $promises Traversable of promises to wait upon.
+ *
+ * @return array
+ *
+ * @deprecated inspect will be removed in guzzlehttp/promises:2.0. Use Utils::inspectAll instead.
+ */
+function inspect_all($promises)
+{
+    return Utils::inspectAll($promises);
+}
+/**
+ * Waits on all of the provided promises and returns the fulfilled values.
+ *
+ * Returns an array that contains the value of each promise (in the same order
+ * the promises were provided). An exception is thrown if any of the promises
+ * are rejected.
+ *
+ * @param iterable<PromiseInterface> $promises Iterable of PromiseInterface objects to wait on.
+ *
+ * @return array
+ *
+ * @throws \Exception on error
+ * @throws \Throwable on error in PHP >=7
+ *
+ * @deprecated unwrap will be removed in guzzlehttp/promises:2.0. Use Utils::unwrap instead.
+ */
+function unwrap($promises)
+{
+    return Utils::unwrap($promises);
+}
+/**
+ * Given an array of promises, return a promise that is fulfilled when all the
+ * items in the array are fulfilled.
+ *
+ * The promise's fulfillment value is an array with fulfillment values at
+ * respective positions to the original array. If any promise in the array
+ * rejects, the returned promise is rejected with the rejection reason.
+ *
+ * @param mixed $promises  Promises or values.
+ * @param bool  $recursive If true, resolves new promises that might have been added to the stack during its own resolution.
+ *
+ * @return PromiseInterface
+ *
+ * @deprecated all will be removed in guzzlehttp/promises:2.0. Use Utils::all instead.
+ */
+function all($promises, $recursive = \false)
+{
+    return Utils::all($promises, $recursive);
+}
+/**
+ * Initiate a competitive race between multiple promises or values (values will
+ * become immediately fulfilled promises).
+ *
+ * When count amount of promises have been fulfilled, the returned promise is
+ * fulfilled with an array that contains the fulfillment values of the winners
+ * in order of resolution.
+ *
+ * This promise is rejected with a {@see AggregateException} if the number of
+ * fulfilled promises is less than the desired $count.
+ *
+ * @param int   $count    Total number of promises.
+ * @param mixed $promises Promises or values.
+ *
+ * @return PromiseInterface
+ *
+ * @deprecated some will be removed in guzzlehttp/promises:2.0. Use Utils::some instead.
+ */
+function some($count, $promises)
+{
+    return Utils::some($count, $promises);
+}
+/**
+ * Like some(), with 1 as count. However, if the promise fulfills, the
+ * fulfillment value is not an array of 1 but the value directly.
+ *
+ * @param mixed $promises Promises or values.
+ *
+ * @return PromiseInterface
+ *
+ * @deprecated any will be removed in guzzlehttp/promises:2.0. Use Utils::any instead.
+ */
+function any($promises)
+{
+    return Utils::any($promises);
+}
+/**
+ * Returns a promise that is fulfilled when all of the provided promises have
+ * been fulfilled or rejected.
+ *
+ * The returned promise is fulfilled with an array of inspection state arrays.
+ *
+ * @see inspect for the inspection state array format.
+ *
+ * @param mixed $promises Promises or values.
+ *
+ * @return PromiseInterface
+ *
+ * @deprecated settle will be removed in guzzlehttp/promises:2.0. Use Utils::settle instead.
+ */
+function settle($promises)
+{
+    return Utils::settle($promises);
+}
+/**
+ * Given an iterator that yields promises or values, returns a promise that is
+ * fulfilled with a null value when the iterator has been consumed or the
+ * aggregate promise has been fulfilled or rejected.
+ *
+ * $onFulfilled is a function that accepts the fulfilled value, iterator index,
+ * and the aggregate promise. The callback can invoke any necessary side
+ * effects and choose to resolve or reject the aggregate if needed.
+ *
+ * $onRejected is a function that accepts the rejection reason, iterator index,
+ * and the aggregate promise. The callback can invoke any necessary side
+ * effects and choose to resolve or reject the aggregate if needed.
+ *
+ * @param mixed    $iterable    Iterator or array to iterate over.
+ * @param callable $onFulfilled
+ * @param callable $onRejected
+ *
+ * @return PromiseInterface
+ *
+ * @deprecated each will be removed in guzzlehttp/promises:2.0. Use Each::of instead.
+ */
+function each($iterable, callable $onFulfilled = null, callable $onRejected = null)
+{
+    return Each::of($iterable, $onFulfilled, $onRejected);
+}
+/**
+ * Like each, but only allows a certain number of outstanding promises at any
+ * given time.
+ *
+ * $concurrency may be an integer or a function that accepts the number of
+ * pending promises and returns a numeric concurrency limit value to allow for
+ * dynamic a concurrency size.
+ *
+ * @param mixed        $iterable
+ * @param int|callable $concurrency
+ * @param callable     $onFulfilled
+ * @param callable     $onRejected
+ *
+ * @return PromiseInterface
+ *
+ * @deprecated each_limit will be removed in guzzlehttp/promises:2.0. Use Each::ofLimit instead.
+ */
+function each_limit($iterable, $concurrency, callable $onFulfilled = null, callable $onRejected = null)
+{
+    return Each::ofLimit($iterable, $concurrency, $onFulfilled, $onRejected);
+}
+/**
+ * Like each_limit, but ensures that no promise in the given $iterable argument
+ * is rejected. If any promise is rejected, then the aggregate promise is
+ * rejected with the encountered rejection.
+ *
+ * @param mixed        $iterable
+ * @param int|callable $concurrency
+ * @param callable     $onFulfilled
+ *
+ * @return PromiseInterface
+ *
+ * @deprecated each_limit_all will be removed in guzzlehttp/promises:2.0. Use Each::ofLimitAll instead.
+ */
+function each_limit_all($iterable, $concurrency, callable $onFulfilled = null)
+{
+    return Each::ofLimitAll($iterable, $concurrency, $onFulfilled);
+}
+/**
+ * Returns true if a promise is fulfilled.
+ *
+ * @return bool
+ *
+ * @deprecated is_fulfilled will be removed in guzzlehttp/promises:2.0. Use Is::fulfilled instead.
+ */
+function is_fulfilled(PromiseInterface $promise)
+{
+    return Is::fulfilled($promise);
+}
+/**
+ * Returns true if a promise is rejected.
+ *
+ * @return bool
+ *
+ * @deprecated is_rejected will be removed in guzzlehttp/promises:2.0. Use Is::rejected instead.
+ */
+function is_rejected(PromiseInterface $promise)
+{
+    return Is::rejected($promise);
+}
+/**
+ * Returns true if a promise is fulfilled or rejected.
+ *
+ * @return bool
+ *
+ * @deprecated is_settled will be removed in guzzlehttp/promises:2.0. Use Is::settled instead.
+ */
+function is_settled(PromiseInterface $promise)
+{
+    return Is::settled($promise);
+}
+/**
+ * Create a new coroutine.
+ *
+ * @see Coroutine
+ *
+ * @return PromiseInterface
+ *
+ * @deprecated coroutine will be removed in guzzlehttp/promises:2.0. Use Coroutine::of instead.
+ */
+function coroutine(callable $generatorFn)
+{
+    return Coroutine::of($generatorFn);
+}

dependencies/guzzlehttp/promises/src/functions_include.php

@@ -0,0 +1,8 @@
+<?php
+
+namespace WP_Ultimo\Dependencies;
+
+// Don't redefine the functions if included multiple times.
+if (!\function_exists('WP_Ultimo\\Dependencies\\GuzzleHttp\\Promise\\promise_for')) {
+    require __DIR__ . '/functions.php';
+}

dependencies/guzzlehttp/psr7/src/AppendStream.php

@@ -0,0 +1,203 @@
+<?php
+
+declare (strict_types=1);
+namespace WP_Ultimo\Dependencies\GuzzleHttp\Psr7;
+
+use WP_Ultimo\Dependencies\Psr\Http\Message\StreamInterface;
+/**
+ * Reads from multiple streams, one after the other.
+ *
+ * This is a read-only stream decorator.
+ */
+final class AppendStream implements StreamInterface
+{
+    /** @var StreamInterface[] Streams being decorated */
+    private $streams = [];
+    /** @var bool */
+    private $seekable = \true;
+    /** @var int */
+    private $current = 0;
+    /** @var int */
+    private $pos = 0;
+    /**
+     * @param StreamInterface[] $streams Streams to decorate. Each stream must
+     *                                   be readable.
+     */
+    public function __construct(array $streams = [])
+    {
+        foreach ($streams as $stream) {
+            $this->addStream($stream);
+        }
+    }
+    public function __toString() : string
+    {
+        try {
+            $this->rewind();
+            return $this->getContents();
+        } catch (\Throwable $e) {
+            if (\PHP_VERSION_ID >= 70400) {
+                throw $e;
+            }
+            \trigger_error(\sprintf('%s::__toString exception: %s', self::class, (string) $e), \E_USER_ERROR);
+            return '';
+        }
+    }
+    /**
+     * Add a stream to the AppendStream
+     *
+     * @param StreamInterface $stream Stream to append. Must be readable.
+     *
+     * @throws \InvalidArgumentException if the stream is not readable
+     */
+    public function addStream(StreamInterface $stream) : void
+    {
+        if (!$stream->isReadable()) {
+            throw new \InvalidArgumentException('Each stream must be readable');
+        }
+        // The stream is only seekable if all streams are seekable
+        if (!$stream->isSeekable()) {
+            $this->seekable = \false;
+        }
+        $this->streams[] = $stream;
+    }
+    public function getContents() : string
+    {
+        return Utils::copyToString($this);
+    }
+    /**
+     * Closes each attached stream.
+     */
+    public function close() : void
+    {
+        $this->pos = $this->current = 0;
+        $this->seekable = \true;
+        foreach ($this->streams as $stream) {
+            $stream->close();
+        }
+        $this->streams = [];
+    }
+    /**
+     * Detaches each attached stream.
+     *
+     * Returns null as it's not clear which underlying stream resource to return.
+     */
+    public function detach()
+    {
+        $this->pos = $this->current = 0;
+        $this->seekable = \true;
+        foreach ($this->streams as $stream) {
+            $stream->detach();
+        }
+        $this->streams = [];
+        return null;
+    }
+    public function tell() : int
+    {
+        return $this->pos;
+    }
+    /**
+     * Tries to calculate the size by adding the size of each stream.
+     *
+     * If any of the streams do not return a valid number, then the size of the
+     * append stream cannot be determined and null is returned.
+     */
+    public function getSize() : ?int
+    {
+        $size = 0;
+        foreach ($this->streams as $stream) {
+            $s = $stream->getSize();
+            if ($s === null) {
+                return null;
+            }
+            $size += $s;
+        }
+        return $size;
+    }
+    public function eof() : bool
+    {
+        return !$this->streams || $this->current >= \count($this->streams) - 1 && $this->streams[$this->current]->eof();
+    }
+    public function rewind() : void
+    {
+        $this->seek(0);
+    }
+    /**
+     * Attempts to seek to the given position. Only supports SEEK_SET.
+     */
+    public function seek($offset, $whence = \SEEK_SET) : void
+    {
+        if (!$this->seekable) {
+            throw new \RuntimeException('This AppendStream is not seekable');
+        } elseif ($whence !== \SEEK_SET) {
+            throw new \RuntimeException('The AppendStream can only seek with SEEK_SET');
+        }
+        $this->pos = $this->current = 0;
+        // Rewind each stream
+        foreach ($this->streams as $i => $stream) {
+            try {
+                $stream->rewind();
+            } catch (\Exception $e) {
+                throw new \RuntimeException('Unable to seek stream ' . $i . ' of the AppendStream', 0, $e);
+            }
+        }
+        // Seek to the actual position by reading from each stream
+        while ($this->pos < $offset && !$this->eof()) {
+            $result = $this->read(\min(8096, $offset - $this->pos));
+            if ($result === '') {
+                break;
+            }
+        }
+    }
+    /**
+     * Reads from all of the appended streams until the length is met or EOF.
+     */
+    public function read($length) : string
+    {
+        $buffer = '';
+        $total = \count($this->streams) - 1;
+        $remaining = $length;
+        $progressToNext = \false;
+        while ($remaining > 0) {
+            // Progress to the next stream if needed.
+            if ($progressToNext || $this->streams[$this->current]->eof()) {
+                $progressToNext = \false;
+                if ($this->current === $total) {
+                    break;
+                }
+                ++$this->current;
+            }
+            $result = $this->streams[$this->current]->read($remaining);
+            if ($result === '') {
+                $progressToNext = \true;
+                continue;
+            }
+            $buffer .= $result;
+            $remaining = $length - \strlen($buffer);
+        }
+        $this->pos += \strlen($buffer);
+        return $buffer;
+    }
+    public function isReadable() : bool
+    {
+        return \true;
+    }
+    public function isWritable() : bool
+    {
+        return \false;
+    }
+    public function isSeekable() : bool
+    {
+        return $this->seekable;
+    }
+    public function write($string) : int
+    {
+        throw new \RuntimeException('Cannot write to an AppendStream');
+    }
+    /**
+     * @return mixed
+     */
+    public function getMetadata($key = null)
+    {
+        return $key ? null : [];
+    }
+}

dependencies/guzzlehttp/psr7/src/BufferStream.php

@@ -0,0 +1,121 @@
+<?php
+
+declare (strict_types=1);
+namespace WP_Ultimo\Dependencies\GuzzleHttp\Psr7;
+
+use WP_Ultimo\Dependencies\Psr\Http\Message\StreamInterface;
+/**
+ * Provides a buffer stream that can be written to to fill a buffer, and read
+ * from to remove bytes from the buffer.
+ *
+ * This stream returns a "hwm" metadata value that tells upstream consumers
+ * what the configured high water mark of the stream is, or the maximum
+ * preferred size of the buffer.
+ */
+final class BufferStream implements StreamInterface
+{
+    /** @var int */
+    private $hwm;
+    /** @var string */
+    private $buffer = '';
+    /**
+     * @param int $hwm High water mark, representing the preferred maximum
+     *                 buffer size. If the size of the buffer exceeds the high
+     *                 water mark, then calls to write will continue to succeed
+     *                 but will return 0 to inform writers to slow down
+     *                 until the buffer has been drained by reading from it.
+     */
+    public function __construct(int $hwm = 16384)
+    {
+        $this->hwm = $hwm;
+    }
+    public function __toString() : string
+    {
+        return $this->getContents();
+    }
+    public function getContents() : string
+    {
+        $buffer = $this->buffer;
+        $this->buffer = '';
+        return $buffer;
+    }
+    public function close() : void
+    {
+        $this->buffer = '';
+    }
+    public function detach()
+    {
+        $this->close();
+        return null;
+    }
+    public function getSize() : ?int
+    {
+        return \strlen($this->buffer);
+    }
+    public function isReadable() : bool
+    {
+        return \true;
+    }
+    public function isWritable() : bool
+    {
+        return \true;
+    }
+    public function isSeekable() : bool
+    {
+        return \false;
+    }
+    public function rewind() : void
+    {
+        $this->seek(0);
+    }
+    public function seek($offset, $whence = \SEEK_SET) : void
+    {
+        throw new \RuntimeException('Cannot seek a BufferStream');
+    }
+    public function eof() : bool
+    {
+        return \strlen($this->buffer) === 0;
+    }
+    public function tell() : int
+    {
+        throw new \RuntimeException('Cannot determine the position of a BufferStream');
+    }
+    /**
+     * Reads data from the buffer.
+     */
+    public function read($length) : string
+    {
+        $currentLength = \strlen($this->buffer);
+        if ($length >= $currentLength) {
+            // No need to slice the buffer because we don't have enough data.
+            $result = $this->buffer;
+            $this->buffer = '';
+        } else {
+            // Slice up the result to provide a subset of the buffer.
+            $result = \substr($this->buffer, 0, $length);
+            $this->buffer = \substr($this->buffer, $length);
+        }
+        return $result;
+    }
+    /**
+     * Writes data to the buffer.
+     */
+    public function write($string) : int
+    {
+        $this->buffer .= $string;
+        if (\strlen($this->buffer) >= $this->hwm) {
+            return 0;
+        }
+        return \strlen($string);
+    }
+    /**
+     * @return mixed
+     */
+    public function getMetadata($key = null)
+    {
+        if ($key === 'hwm') {
+            return $this->hwm;
+        }
+        return $key ? null : [];
+    }
+}

dependencies/guzzlehttp/psr7/src/CachingStream.php

@@ -0,0 +1,125 @@
+<?php
+
+declare (strict_types=1);
+namespace WP_Ultimo\Dependencies\GuzzleHttp\Psr7;
+
+use WP_Ultimo\Dependencies\Psr\Http\Message\StreamInterface;
+/**
+ * Stream decorator that can cache previously read bytes from a sequentially
+ * read stream.
+ */
+final class CachingStream implements StreamInterface
+{
+    use StreamDecoratorTrait;
+    /** @var StreamInterface Stream being wrapped */
+    private $remoteStream;
+    /** @var int Number of bytes to skip reading due to a write on the buffer */
+    private $skipReadBytes = 0;
+    /**
+     * @var StreamInterface
+     */
+    private $stream;
+    /**
+     * We will treat the buffer object as the body of the stream
+     *
+     * @param StreamInterface $stream Stream to cache. The cursor is assumed to be at the beginning of the stream.
+     * @param StreamInterface $target Optionally specify where data is cached
+     */
+    public function __construct(StreamInterface $stream, StreamInterface $target = null)
+    {
+        $this->remoteStream = $stream;
+        $this->stream = $target ?: new Stream(Utils::tryFopen('php://temp', 'r+'));
+    }
+    public function getSize() : ?int
+    {
+        $remoteSize = $this->remoteStream->getSize();
+        if (null === $remoteSize) {
+            return null;
+        }
+        return \max($this->stream->getSize(), $remoteSize);
+    }
+    public function rewind() : void
+    {
+        $this->seek(0);
+    }
+    public function seek($offset, $whence = \SEEK_SET) : void
+    {
+        if ($whence === \SEEK_SET) {
+            $byte = $offset;
+        } elseif ($whence === \SEEK_CUR) {
+            $byte = $offset + $this->tell();
+        } elseif ($whence === \SEEK_END) {
+            $size = $this->remoteStream->getSize();
+            if ($size === null) {
+                $size = $this->cacheEntireStream();
+            }
+            $byte = $size + $offset;
+        } else {
+            throw new \InvalidArgumentException('Invalid whence');
+        }
+        $diff = $byte - $this->stream->getSize();
+        if ($diff > 0) {
+            // Read the remoteStream until we have read in at least the amount
+            // of bytes requested, or we reach the end of the file.
+            while ($diff > 0 && !$this->remoteStream->eof()) {
+                $this->read($diff);
+                $diff = $byte - $this->stream->getSize();
+            }
+        } else {
+            // We can just do a normal seek since we've already seen this byte.
+            $this->stream->seek($byte);
+        }
+    }
+    public function read($length) : string
+    {
+        // Perform a regular read on any previously read data from the buffer
+        $data = $this->stream->read($length);
+        $remaining = $length - \strlen($data);
+        // More data was requested so read from the remote stream
+        if ($remaining) {
+            // If data was written to the buffer in a position that would have
+            // been filled from the remote stream, then we must skip bytes on
+            // the remote stream to emulate overwriting bytes from that
+            // position. This mimics the behavior of other PHP stream wrappers.
+            $remoteData = $this->remoteStream->read($remaining + $this->skipReadBytes);
+            if ($this->skipReadBytes) {
+                $len = \strlen($remoteData);
+                $remoteData = \substr($remoteData, $this->skipReadBytes);
+                $this->skipReadBytes = \max(0, $this->skipReadBytes - $len);
+            }
+            $data .= $remoteData;
+            $this->stream->write($remoteData);
+        }
+        return $data;
+    }
+    public function write($string) : int
+    {
+        // When appending to the end of the currently read stream, you'll want
+        // to skip bytes from being read from the remote stream to emulate
+        // other stream wrappers. Basically replacing bytes of data of a fixed
+        // length.
+        $overflow = \strlen($string) + $this->tell() - $this->remoteStream->tell();
+        if ($overflow > 0) {
+            $this->skipReadBytes += $overflow;
+        }
+        return $this->stream->write($string);
+    }
+    public function eof() : bool
+    {
+        return $this->stream->eof() && $this->remoteStream->eof();
+    }
+    /**
+     * Close both the remote stream and buffer stream
+     */
+    public function close() : void
+    {
+        $this->remoteStream->close();
+        $this->stream->close();
+    }
+    private function cacheEntireStream() : int
+    {
+        $target = new FnStream(['write' => 'strlen']);
+        Utils::copyToStream($this, $target);
+        return $this->tell();
+    }
+}

dependencies/guzzlehttp/psr7/src/DroppingStream.php

@@ -0,0 +1,40 @@
+<?php
+
+declare (strict_types=1);
+namespace WP_Ultimo\Dependencies\GuzzleHttp\Psr7;
+
+use WP_Ultimo\Dependencies\Psr\Http\Message\StreamInterface;
+/**
+ * Stream decorator that begins dropping data once the size of the underlying
+ * stream becomes too full.
+ */
+final class DroppingStream implements StreamInterface
+{
+    use StreamDecoratorTrait;
+    /** @var int */
+    private $maxLength;
+    /** @var StreamInterface */
+    private $stream;
+    /**
+     * @param StreamInterface $stream    Underlying stream to decorate.
+     * @param int             $maxLength Maximum size before dropping data.
+     */
+    public function __construct(StreamInterface $stream, int $maxLength)
+    {
+        $this->stream = $stream;
+        $this->maxLength = $maxLength;
+    }
+    public function write($string) : int
+    {
+        $diff = $this->maxLength - $this->stream->getSize();
+        // Begin returning 0 when the underlying stream is too large.
+        if ($diff <= 0) {
+            return 0;
+        }
+        // Write the stream or a subset of the stream if needed.
+        if (\strlen($string) < $diff) {
+            return $this->stream->write($string);
+        }
+        return $this->stream->write(\substr($string, 0, $diff));
+    }
+}

dependencies/guzzlehttp/psr7/src/Exception/MalformedUriException.php

@@ -0,0 +1,12 @@
+<?php
+
+declare (strict_types=1);
+namespace WP_Ultimo\Dependencies\GuzzleHttp\Psr7\Exception;
+
+use InvalidArgumentException;
+/**
+ * Exception thrown if a URI cannot be parsed because it's malformed.
+ */
+class MalformedUriException extends InvalidArgumentException
+{
+}

dependencies/guzzlehttp/psr7/src/FnStream.php

@@ -0,0 +1,148 @@
+<?php
+
+declare (strict_types=1);
+namespace WP_Ultimo\Dependencies\GuzzleHttp\Psr7;
+
+use WP_Ultimo\Dependencies\Psr\Http\Message\StreamInterface;
+/**
+ * Compose stream implementations based on a hash of functions.
+ *
+ * Allows for easy testing and extension of a provided stream without needing
+ * to create a concrete class for a simple extension point.
+ */
+#[\AllowDynamicProperties]
+final class FnStream implements StreamInterface
+{
+    private const SLOTS = ['__toString', 'close', 'detach', 'rewind', 'getSize', 'tell', 'eof', 'isSeekable', 'seek', 'isWritable', 'write', 'isReadable', 'read', 'getContents', 'getMetadata'];
+    /** @var array<string, callable> */
+    private $methods;
+    /**
+     * @param array<string, callable> $methods Hash of method name to a callable.
+     */
+    public function __construct(array $methods)
+    {
+        $this->methods = $methods;
+        // Create the functions on the class
+        foreach ($methods as $name => $fn) {
+            $this->{'_fn_' . $name} = $fn;
+        }
+    }
+    /**
+     * Lazily determine which methods are not implemented.
+     *
+     * @throws \BadMethodCallException
+     */
+    public function __get(string $name) : void
+    {
+        throw new \BadMethodCallException(\str_replace('_fn_', '', $name) . '() is not implemented in the FnStream');
+    }
+    /**
+     * The close method is called on the underlying stream only if possible.
+     */
+    public function __destruct()
+    {
+        if (isset($this->_fn_close)) {
+            \call_user_func($this->_fn_close);
+        }
+    }
+    /**
+     * An unserialize would allow the __destruct to run when the unserialized value goes out of scope.
+     *
+     * @throws \LogicException
+     */
+    public function __wakeup() : void
+    {
+        throw new \LogicException('FnStream should never be unserialized');
+    }
+    /**
+     * Adds custom functionality to an underlying stream by intercepting
+     * specific method calls.
+     *
+     * @param StreamInterface         $stream  Stream to decorate
+     * @param array<string, callable> $methods Hash of method name to a closure
+     *
+     * @return FnStream
+     */
+    public static function decorate(StreamInterface $stream, array $methods)
+    {
+        // If any of the required methods were not provided, then simply
+        // proxy to the decorated stream.
+        foreach (\array_diff(self::SLOTS, \array_keys($methods)) as $diff) {
+            /** @var callable $callable */
+            $callable = [$stream, $diff];
+            $methods[$diff] = $callable;
+        }
+        return new self($methods);
+    }
+    public function __toString() : string
+    {
+        try {
+            return \call_user_func($this->_fn___toString);
+        } catch (\Throwable $e) {
+            if (\PHP_VERSION_ID >= 70400) {
+                throw $e;
+            }
+            \trigger_error(\sprintf('%s::__toString exception: %s', self::class, (string) $e), \E_USER_ERROR);
+            return '';
+        }
+    }
+    public function close() : void
+    {
+        \call_user_func($this->_fn_close);
+    }
+    public function detach()
+    {
+        return \call_user_func($this->_fn_detach);
+    }
+    public function getSize() : ?int
+    {
+        return \call_user_func($this->_fn_getSize);
+    }
+    public function tell() : int
+    {
+        return \call_user_func($this->_fn_tell);
+    }
+    public function eof() : bool
+    {
+        return \call_user_func($this->_fn_eof);
+    }
+    public function isSeekable() : bool
+    {
+        return \call_user_func($this->_fn_isSeekable);
+    }
+    public function rewind() : void
+    {
+        \call_user_func($this->_fn_rewind);
+    }
+    public function seek($offset, $whence = \SEEK_SET) : void
+    {
+        \call_user_func($this->_fn_seek, $offset, $whence);
+    }
+    public function isWritable() : bool
+    {
+        return \call_user_func($this->_fn_isWritable);
+    }
+    public function write($string) : int
+    {
+        return \call_user_func($this->_fn_write, $string);
+    }
+    public function isReadable() : bool
+    {
+        return \call_user_func($this->_fn_isReadable);
+    }
+    public function read($length) : string
+    {
+        return \call_user_func($this->_fn_read, $length);
+    }
+    public function getContents() : string
+    {
+        return \call_user_func($this->_fn_getContents);
+    }
+    /**
+     * @return mixed
+     */
+    public function getMetadata($key = null)
+    {
+        return \call_user_func($this->_fn_getMetadata, $key);
+    }
+}

dependencies/guzzlehttp/psr7/src/Header.php

@@ -0,0 +1,117 @@
+<?php
+
+declare (strict_types=1);
+namespace WP_Ultimo\Dependencies\GuzzleHttp\Psr7;
+
+final class Header
+{
+    /**
+     * Parse an array of header values containing ";" separated data into an
+     * array of associative arrays representing the header key value pair data
+     * of the header. When a parameter does not contain a value, but just
+     * contains a key, this function will inject a key with a '' string value.
+     *
+     * @param string|array $header Header to parse into components.
+     */
+    public static function parse($header) : array
+    {
+        static $trimmed = "\"'  \n\t\r";
+        $params = $matches = [];
+        foreach ((array) $header as $value) {
+            foreach (self::splitList($value) as $val) {
+                $part = [];
+                foreach (\preg_split('/;(?=([^"]*"[^"]*")*[^"]*$)/', $val) as $kvp) {
+                    if (\preg_match_all('/<[^>]+>|[^=]+/', $kvp, $matches)) {
+                        $m = $matches[0];
+                        if (isset($m[1])) {
+                            $part[\trim($m[0], $trimmed)] = \trim($m[1], $trimmed);
+                        } else {
+                            $part[] = \trim($m[0], $trimmed);
+                        }
+                    }
+                }
+                if ($part) {
+                    $params[] = $part;
+                }
+            }
+        }
+        return $params;
+    }
+    /**
+     * Converts an array of header values that may contain comma separated
+     * headers into an array of headers with no comma separated values.
+     *
+     * @param string|array $header Header to normalize.
+     *
+     * @deprecated Use self::splitList() instead.
+     */
+    public static function normalize($header) : array
+    {
+        $result = [];
+        foreach ((array) $header as $value) {
+            foreach (self::splitList($value) as $parsed) {
+                $result[] = $parsed;
+            }
+        }
+        return $result;
+    }
+    /**
+     * Splits a HTTP header defined to contain a comma-separated list into
+     * each individual value. Empty values will be removed.
+     *
+     * Example headers include 'accept', 'cache-control' and 'if-none-match'.
+     *
+     * This method must not be used to parse headers that are not defined as
+     * a list, such as 'user-agent' or 'set-cookie'.
+     *
+     * @param string|string[] $values Header value as returned by MessageInterface::getHeader()
+     *
+     * @return string[]
+     */
+    public static function splitList($values) : array
+    {
+        if (!\is_array($values)) {
+            $values = [$values];
+        }
+        $result = [];
+        foreach ($values as $value) {
+            if (!\is_string($value)) {
+                throw new \TypeError('$header must either be a string or an array containing strings.');
+            }
+            $v = '';
+            $isQuoted = \false;
+            $isEscaped = \false;
+            for ($i = 0, $max = \strlen($value); $i < $max; ++$i) {
+                if ($isEscaped) {
+                    $v .= $value[$i];
+                    $isEscaped = \false;
+                    continue;
+                }
+                if (!$isQuoted && $value[$i] === ',') {
+                    $v = \trim($v);
+                    if ($v !== '') {
+                        $result[] = $v;
+                    }
+                    $v = '';
+                    continue;
+                }
+                if ($isQuoted && $value[$i] === '\\') {
+                    $isEscaped = \true;
+                    $v .= $value[$i];
+                    continue;
+                }
+                if ($value[$i] === '"') {
+                    $isQuoted = !$isQuoted;
+                    $v .= $value[$i];
+                    continue;
+                }
+                $v .= $value[$i];
+            }
+            $v = \trim($v);
+            if ($v !== '') {
+                $result[] = $v;
+            }
+        }
+        return $result;
+    }
+}

dependencies/guzzlehttp/psr7/src/HttpFactory.php

@@ -0,0 +1,76 @@
+<?php
+
+declare (strict_types=1);
+namespace WP_Ultimo\Dependencies\GuzzleHttp\Psr7;
+
+use WP_Ultimo\Dependencies\Psr\Http\Message\RequestFactoryInterface;
+use WP_Ultimo\Dependencies\Psr\Http\Message\RequestInterface;
+use WP_Ultimo\Dependencies\Psr\Http\Message\ResponseFactoryInterface;
+use WP_Ultimo\Dependencies\Psr\Http\Message\ResponseInterface;
+use WP_Ultimo\Dependencies\Psr\Http\Message\ServerRequestFactoryInterface;
+use WP_Ultimo\Dependencies\Psr\Http\Message\ServerRequestInterface;
+use WP_Ultimo\Dependencies\Psr\Http\Message\StreamFactoryInterface;
+use WP_Ultimo\Dependencies\Psr\Http\Message\StreamInterface;
+use WP_Ultimo\Dependencies\Psr\Http\Message\UploadedFileFactoryInterface;
+use WP_Ultimo\Dependencies\Psr\Http\Message\UploadedFileInterface;
+use WP_Ultimo\Dependencies\Psr\Http\Message\UriFactoryInterface;
+use WP_Ultimo\Dependencies\Psr\Http\Message\UriInterface;
+/**
+ * Implements all of the PSR-17 interfaces.
+ *
+ * Note: in consuming code it is recommended to require the implemented interfaces
+ * and inject the instance of this class multiple times.
+ */
+final class HttpFactory implements RequestFactoryInterface, ResponseFactoryInterface, ServerRequestFactoryInterface, StreamFactoryInterface, UploadedFileFactoryInterface, UriFactoryInterface
+{
+    public function createUploadedFile(StreamInterface $stream, int $size = null, int $error = \UPLOAD_ERR_OK, string $clientFilename = null, string $clientMediaType = null) : UploadedFileInterface
+    {
+        if ($size === null) {
+            $size = $stream->getSize();
+        }
+        return new UploadedFile($stream, $size, $error, $clientFilename, $clientMediaType);
+    }
+    public function createStream(string $content = '') : StreamInterface
+    {
+        return Utils::streamFor($content);
+    }
+    public function createStreamFromFile(string $file, string $mode = 'r') : StreamInterface
+    {
+        try {
+            $resource = Utils::tryFopen($file, $mode);
+        } catch (\RuntimeException $e) {
+            if ('' === $mode || \false === \in_array($mode[0], ['r', 'w', 'a', 'x', 'c'], \true)) {
+                throw new \InvalidArgumentException(\sprintf('Invalid file opening mode "%s"', $mode), 0, $e);
+            }
+            throw $e;
+        }
+        return Utils::streamFor($resource);
+    }
+    public function createStreamFromResource($resource) : StreamInterface
+    {
+        return Utils::streamFor($resource);
+    }
+    public function createServerRequest(string $method, $uri, array $serverParams = []) : ServerRequestInterface
+    {
+        if (empty($method)) {
+            if (!empty($serverParams['REQUEST_METHOD'])) {
+                $method = $serverParams['REQUEST_METHOD'];
+            } else {
+                throw new \InvalidArgumentException('Cannot determine HTTP method');
+            }
+        }
+        return new ServerRequest($method, $uri, [], null, '1.1', $serverParams);
+    }
+    public function createResponse(int $code = 200, string $reasonPhrase = '') : ResponseInterface
+    {
+        return new Response($code, [], null, '1.1', $reasonPhrase);
+    }
+    public function createRequest(string $method, $uri) : RequestInterface
+    {
+        return new Request($method, $uri);
+    }
+    public function createUri(string $uri = '') : UriInterface
+    {
+        return new Uri($uri);
+    }
+}

dependencies/guzzlehttp/psr7/src/InflateStream.php

@@ -0,0 +1,33 @@
+<?php
+
+declare (strict_types=1);
+namespace WP_Ultimo\Dependencies\GuzzleHttp\Psr7;
+
+use WP_Ultimo\Dependencies\Psr\Http\Message\StreamInterface;
+/**
+ * Uses PHP's zlib.inflate filter to inflate zlib (HTTP deflate, RFC1950) or gzipped (RFC1952) content.
+ *
+ * This stream decorator converts the provided stream to a PHP stream resource,
+ * then appends the zlib.inflate filter. The stream is then converted back
+ * to a Guzzle stream resource to be used as a Guzzle stream.
+ *
+ * @see http://tools.ietf.org/html/rfc1950
+ * @see http://tools.ietf.org/html/rfc1952
+ * @see http://php.net/manual/en/filters.compression.php
+ */
+final class InflateStream implements StreamInterface
+{
+    use StreamDecoratorTrait;
+    /** @var StreamInterface */
+    private $stream;
+    public function __construct(StreamInterface $stream)
+    {
+        $resource = StreamWrapper::getResource($stream);
+        // Specify window=15+32, so zlib will use header detection to both gzip (with header) and zlib data
+        // See http://www.zlib.net/manual.html#Advanced definition of inflateInit2
+        // "Add 32 to windowBits to enable zlib and gzip decoding with automatic header detection"
+        // Default window size is 15.
+        \stream_filter_append($resource, 'zlib.inflate', \STREAM_FILTER_READ, ['window' => 15 + 32]);
+        $this->stream = $stream->isSeekable() ? new Stream($resource) : new NoSeekStream(new Stream($resource));
+    }
+}

dependencies/guzzlehttp/psr7/src/LazyOpenStream.php

@@ -0,0 +1,41 @@
+<?php
+
+declare (strict_types=1);
+namespace WP_Ultimo\Dependencies\GuzzleHttp\Psr7;
+
+use WP_Ultimo\Dependencies\Psr\Http\Message\StreamInterface;
+/**
+ * Lazily reads or writes to a file that is opened only after an IO operation
+ * take place on the stream.
+ */
+final class LazyOpenStream implements StreamInterface
+{
+    use StreamDecoratorTrait;
+    /** @var string */
+    private $filename;
+    /** @var string */
+    private $mode;
+    /**
+     * @var StreamInterface
+     */
+    private $stream;
+    /**
+     * @param string $filename File to lazily open
+     * @param string $mode     fopen mode to use when opening the stream
+     */
+    public function __construct(string $filename, string $mode)
+    {
+        $this->filename = $filename;
+        $this->mode = $mode;
+        // unsetting the property forces the first access to go through
+        // __get().
+        unset($this->stream);
+    }
+    /**
+     * Creates the underlying stream lazily when required.
+     */
+    protected function createStream() : StreamInterface
+    {
+        return Utils::streamFor(Utils::tryFopen($this->filename, $this->mode));
+    }
+}

dependencies/guzzlehttp/psr7/src/LimitStream.php

@@ -0,0 +1,128 @@
+<?php
+
+declare (strict_types=1);
+namespace WP_Ultimo\Dependencies\GuzzleHttp\Psr7;
+
+use WP_Ultimo\Dependencies\Psr\Http\Message\StreamInterface;
+/**
+ * Decorator used to return only a subset of a stream.
+ */
+final class LimitStream implements StreamInterface
+{
+    use StreamDecoratorTrait;
+    /** @var int Offset to start reading from */
+    private $offset;
+    /** @var int Limit the number of bytes that can be read */
+    private $limit;
+    /** @var StreamInterface */
+    private $stream;
+    /**
+     * @param StreamInterface $stream Stream to wrap
+     * @param int             $limit  Total number of bytes to allow to be read
+     *                                from the stream. Pass -1 for no limit.
+     * @param int             $offset Position to seek to before reading (only
+     *                                works on seekable streams).
+     */
+    public function __construct(StreamInterface $stream, int $limit = -1, int $offset = 0)
+    {
+        $this->stream = $stream;
+        $this->setLimit($limit);
+        $this->setOffset($offset);
+    }
+    public function eof() : bool
+    {
+        // Always return true if the underlying stream is EOF
+        if ($this->stream->eof()) {
+            return \true;
+        }
+        // No limit and the underlying stream is not at EOF
+        if ($this->limit === -1) {
+            return \false;
+        }
+        return $this->stream->tell() >= $this->offset + $this->limit;
+    }
+    /**
+     * Returns the size of the limited subset of data
+     */
+    public function getSize() : ?int
+    {
+        if (null === ($length = $this->stream->getSize())) {
+            return null;
+        } elseif ($this->limit === -1) {
+            return $length - $this->offset;
+        } else {
+            return \min($this->limit, $length - $this->offset);
+        }
+    }
+    /**
+     * Allow for a bounded seek on the read limited stream
+     */
+    public function seek($offset, $whence = \SEEK_SET) : void
+    {
+        if ($whence !== \SEEK_SET || $offset < 0) {
+            throw new \RuntimeException(\sprintf('Cannot seek to offset %s with whence %s', $offset, $whence));
+        }
+        $offset += $this->offset;
+        if ($this->limit !== -1) {
+            if ($offset > $this->offset + $this->limit) {
+                $offset = $this->offset + $this->limit;
+            }
+        }
+        $this->stream->seek($offset);
+    }
+    /**
+     * Give a relative tell()
+     */
+    public function tell() : int
+    {
+        return $this->stream->tell() - $this->offset;
+    }
+    /**
+     * Set the offset to start limiting from
+     *
+     * @param int $offset Offset to seek to and begin byte limiting from
+     *
+     * @throws \RuntimeException if the stream cannot be seeked.
+     */
+    public function setOffset(int $offset) : void
+    {
+        $current = $this->stream->tell();
+        if ($current !== $offset) {
+            // If the stream cannot seek to the offset position, then read to it
+            if ($this->stream->isSeekable()) {
+                $this->stream->seek($offset);
+            } elseif ($current > $offset) {
+                throw new \RuntimeException("Could not seek to stream offset {$offset}");
+            } else {
+                $this->stream->read($offset - $current);
+            }
+        }
+        $this->offset = $offset;
+    }
+    /**
+     * Set the limit of bytes that the decorator allows to be read from the
+     * stream.
+     *
+     * @param int $limit Number of bytes to allow to be read from the stream.
+     *                   Use -1 for no limit.
+     */
+    public function setLimit(int $limit) : void
+    {
+        $this->limit = $limit;
+    }
+    public function read($length) : string
+    {
+        if ($this->limit === -1) {
+            return $this->stream->read($length);
+        }
+        // Check if the current position is less than the total allowed
+        // bytes + original offset
+        $remaining = $this->offset + $this->limit - $this->stream->tell();
+        if ($remaining > 0) {
+            // Only return the amount of requested data, ensuring that the byte
+            // limit is not exceeded
+            return $this->stream->read(\min($remaining, $length));
+        }
+        return '';
+    }
+}

dependencies/guzzlehttp/psr7/src/Message.php

@@ -0,0 +1,189 @@
+<?php
+
+declare (strict_types=1);
+namespace WP_Ultimo\Dependencies\GuzzleHttp\Psr7;
+
+use WP_Ultimo\Dependencies\Psr\Http\Message\MessageInterface;
+use WP_Ultimo\Dependencies\Psr\Http\Message\RequestInterface;
+use WP_Ultimo\Dependencies\Psr\Http\Message\ResponseInterface;
+final class Message
+{
+    /**
+     * Returns the string representation of an HTTP message.
+     *
+     * @param MessageInterface $message Message to convert to a string.
+     */
+    public static function toString(MessageInterface $message) : string
+    {
+        if ($message instanceof RequestInterface) {
+            $msg = \trim($message->getMethod() . ' ' . $message->getRequestTarget()) . ' HTTP/' . $message->getProtocolVersion();
+            if (!$message->hasHeader('host')) {
+                $msg .= "\r\nHost: " . $message->getUri()->getHost();
+            }
+        } elseif ($message instanceof ResponseInterface) {
+            $msg = 'HTTP/' . $message->getProtocolVersion() . ' ' . $message->getStatusCode() . ' ' . $message->getReasonPhrase();
+        } else {
+            throw new \InvalidArgumentException('Unknown message type');
+        }
+        foreach ($message->getHeaders() as $name => $values) {
+            if (\is_string($name) && \strtolower($name) === 'set-cookie') {
+                foreach ($values as $value) {
+                    $msg .= "\r\n{$name}: " . $value;
+                }
+            } else {
+                $msg .= "\r\n{$name}: " . \implode(', ', $values);
+            }
+        }
+        return "{$msg}\r\n\r\n" . $message->getBody();
+    }
+    /**
+     * Get a short summary of the message body.
+     *
+     * Will return `null` if the response is not printable.
+     *
+     * @param MessageInterface $message    The message to get the body summary
+     * @param int              $truncateAt The maximum allowed size of the summary
+     */
+    public static function bodySummary(MessageInterface $message, int $truncateAt = 120) : ?string
+    {
+        $body = $message->getBody();
+        if (!$body->isSeekable() || !$body->isReadable()) {
+            return null;
+        }
+        $size = $body->getSize();
+        if ($size === 0) {
+            return null;
+        }
+        $body->rewind();
+        $summary = $body->read($truncateAt);
+        $body->rewind();
+        if ($size > $truncateAt) {
+            $summary .= ' (truncated...)';
+        }
+        // Matches any printable character, including unicode characters:
+        // letters, marks, numbers, punctuation, spacing, and separators.
+        if (\preg_match('/[^\\pL\\pM\\pN\\pP\\pS\\pZ\\n\\r\\t]/u', $summary) !== 0) {
+            return null;
+        }
+        return $summary;
+    }
+    /**
+     * Attempts to rewind a message body and throws an exception on failure.
+     *
+     * The body of the message will only be rewound if a call to `tell()`
+     * returns a value other than `0`.
+     *
+     * @param MessageInterface $message Message to rewind
+     *
+     * @throws \RuntimeException
+     */
+    public static function rewindBody(MessageInterface $message) : void
+    {
+        $body = $message->getBody();
+        if ($body->tell()) {
+            $body->rewind();
+        }
+    }
+    /**
+     * Parses an HTTP message into an associative array.
+     *
+     * The array contains the "start-line" key containing the start line of
+     * the message, "headers" key containing an associative array of header
+     * array values, and a "body" key containing the body of the message.
+     *
+     * @param string $message HTTP request or response to parse.
+     */
+    public static function parseMessage(string $message) : array
+    {
+        if (!$message) {
+            throw new \InvalidArgumentException('Invalid message');
+        }
+        $message = \ltrim($message, "\r\n");
+        $messageParts = \preg_split("/\r?\n\r?\n/", $message, 2);
+        if ($messageParts === \false || \count($messageParts) !== 2) {
+            throw new \InvalidArgumentException('Invalid message: Missing header delimiter');
+        }
+        [$rawHeaders, $body] = $messageParts;
+        $rawHeaders .= "\r\n";
+        // Put back the delimiter we split previously
+        $headerParts = \preg_split("/\r?\n/", $rawHeaders, 2);
+        if ($headerParts === \false || \count($headerParts) !== 2) {
+            throw new \InvalidArgumentException('Invalid message: Missing status line');
+        }
+        [$startLine, $rawHeaders] = $headerParts;
+        if (\preg_match("/(?:^HTTP\\/|^[A-Z]+ \\S+ HTTP\\/)(\\d+(?:\\.\\d+)?)/i", $startLine, $matches) && $matches[1] === '1.0') {
+            // Header folding is deprecated for HTTP/1.1, but allowed in HTTP/1.0
+            $rawHeaders = \preg_replace(Rfc7230::HEADER_FOLD_REGEX, ' ', $rawHeaders);
+        }
+        /** @var array[] $headerLines */
+        $count = \preg_match_all(Rfc7230::HEADER_REGEX, $rawHeaders, $headerLines, \PREG_SET_ORDER);
+        // If these aren't the same, then one line didn't match and there's an invalid header.
+        if ($count !== \substr_count($rawHeaders, "\n")) {
+            // Folding is deprecated, see https://tools.ietf.org/html/rfc7230#section-3.2.4
+            if (\preg_match(Rfc7230::HEADER_FOLD_REGEX, $rawHeaders)) {
+                throw new \InvalidArgumentException('Invalid header syntax: Obsolete line folding');
+            }
+            throw new \InvalidArgumentException('Invalid header syntax');
+        }
+        $headers = [];
+        foreach ($headerLines as $headerLine) {
+            $headers[$headerLine[1]][] = $headerLine[2];
+        }
+        return ['start-line' => $startLine, 'headers' => $headers, 'body' => $body];
+    }
+    /**
+     * Constructs a URI for an HTTP request message.
+     *
+     * @param string $path    Path from the start-line
+     * @param array  $headers Array of headers (each value an array).
+     */
+    public static function parseRequestUri(string $path, array $headers) : string
+    {
+        $hostKey = \array_filter(\array_keys($headers), function ($k) {
+            // Numeric array keys are converted to int by PHP.
+            $k = (string) $k;
+            return \strtolower($k) === 'host';
+        });
+        // If no host is found, then a full URI cannot be constructed.
+        if (!$hostKey) {
+            return $path;
+        }
+        $host = $headers[\reset($hostKey)][0];
+        $scheme = \substr($host, -4) === ':443' ? 'https' : 'http';
+        return $scheme . '://' . $host . '/' . \ltrim($path, '/');
+    }
+    /**
+     * Parses a request message string into a request object.
+     *
+     * @param string $message Request message string.
+     */
+    public static function parseRequest(string $message) : RequestInterface
+    {
+        $data = self::parseMessage($message);
+        $matches = [];
+        if (!\preg_match('/^[\\S]+\\s+([a-zA-Z]+:\\/\\/|\\/).*/', $data['start-line'], $matches)) {
+            throw new \InvalidArgumentException('Invalid request string');
+        }
+        $parts = \explode(' ', $data['start-line'], 3);
+        $version = isset($parts[2]) ? \explode('/', $parts[2])[1] : '1.1';
+        $request = new Request($parts[0], $matches[1] === '/' ? self::parseRequestUri($parts[1], $data['headers']) : $parts[1], $data['headers'], $data['body'], $version);
+        return $matches[1] === '/' ? $request : $request->withRequestTarget($parts[1]);
+    }
+    /**
+     * Parses a response message string into a response object.
+     *
+     * @param string $message Response message string.
+     */
+    public static function parseResponse(string $message) : ResponseInterface
+    {
+        $data = self::parseMessage($message);
+        // According to https://tools.ietf.org/html/rfc7230#section-3.1.2 the space
+        // between status-code and reason-phrase is required. But browsers accept
+        // responses without space and reason as well.
+        if (!\preg_match('/^HTTP\\/.* [0-9]{3}( .*|$)/', $data['start-line'])) {
+            throw new \InvalidArgumentException('Invalid response string: ' . $data['start-line']);
+        }
+        $parts = \explode(' ', $data['start-line'], 3);
+        return new Response((int) $parts[1], $data['headers'], $data['body'], \explode('/', $parts[0])[1], $parts[2] ?? null);
+    }
+}

dependencies/guzzlehttp/psr7/src/MessageTrait.php

@@ -0,0 +1,212 @@
+<?php
+
+declare (strict_types=1);
+namespace WP_Ultimo\Dependencies\GuzzleHttp\Psr7;
+
+use WP_Ultimo\Dependencies\Psr\Http\Message\MessageInterface;
+use WP_Ultimo\Dependencies\Psr\Http\Message\StreamInterface;
+/**
+ * Trait implementing functionality common to requests and responses.
+ */
+trait MessageTrait
+{
+    /** @var string[][] Map of all registered headers, as original name => array of values */
+    private $headers = [];
+    /** @var string[] Map of lowercase header name => original name at registration */
+    private $headerNames = [];
+    /** @var string */
+    private $protocol = '1.1';
+    /** @var StreamInterface|null */
+    private $stream;
+    public function getProtocolVersion() : string
+    {
+        return $this->protocol;
+    }
+    public function withProtocolVersion($version) : MessageInterface
+    {
+        if ($this->protocol === $version) {
+            return $this;
+        }
+        $new = clone $this;
+        $new->protocol = $version;
+        return $new;
+    }
+    public function getHeaders() : array
+    {
+        return $this->headers;
+    }
+    public function hasHeader($header) : bool
+    {
+        return isset($this->headerNames[\strtolower($header)]);
+    }
+    public function getHeader($header) : array
+    {
+        $header = \strtolower($header);
+        if (!isset($this->headerNames[$header])) {
+            return [];
+        }
+        $header = $this->headerNames[$header];
+        return $this->headers[$header];
+    }
+    public function getHeaderLine($header) : string
+    {
+        return \implode(', ', $this->getHeader($header));
+    }
+    public function withHeader($header, $value) : MessageInterface
+    {
+        $this->assertHeader($header);
+        $value = $this->normalizeHeaderValue($value);
+        $normalized = \strtolower($header);
+        $new = clone $this;
+        if (isset($new->headerNames[$normalized])) {
+            unset($new->headers[$new->headerNames[$normalized]]);
+        }
+        $new->headerNames[$normalized] = $header;
+        $new->headers[$header] = $value;
+        return $new;
+    }
+    public function withAddedHeader($header, $value) : MessageInterface
+    {
+        $this->assertHeader($header);
+        $value = $this->normalizeHeaderValue($value);
+        $normalized = \strtolower($header);
+        $new = clone $this;
+        if (isset($new->headerNames[$normalized])) {
+            $header = $this->headerNames[$normalized];
+            $new->headers[$header] = \array_merge($this->headers[$header], $value);
+        } else {
+            $new->headerNames[$normalized] = $header;
+            $new->headers[$header] = $value;
+        }
+        return $new;
+    }
+    public function withoutHeader($header) : MessageInterface
+    {
+        $normalized = \strtolower($header);
+        if (!isset($this->headerNames[$normalized])) {
+            return $this;
+        }
+        $header = $this->headerNames[$normalized];
+        $new = clone $this;
+        unset($new->headers[$header], $new->headerNames[$normalized]);
+        return $new;
+    }
+    public function getBody() : StreamInterface
+    {
+        if (!$this->stream) {
+            $this->stream = Utils::streamFor('');
+        }
+        return $this->stream;
+    }
+    public function withBody(StreamInterface $body) : MessageInterface
+    {
+        if ($body === $this->stream) {
+            return $this;
+        }
+        $new = clone $this;
+        $new->stream = $body;
+        return $new;
+    }
+    /**
+     * @param array<string|int, string|string[]> $headers
+     */
+    private function setHeaders(array $headers) : void
+    {
+        $this->headerNames = $this->headers = [];
+        foreach ($headers as $header => $value) {
+            // Numeric array keys are converted to int by PHP.
+            $header = (string) $header;
+            $this->assertHeader($header);
+            $value = $this->normalizeHeaderValue($value);
+            $normalized = \strtolower($header);
+            if (isset($this->headerNames[$normalized])) {
+                $header = $this->headerNames[$normalized];
+                $this->headers[$header] = \array_merge($this->headers[$header], $value);
+            } else {
+                $this->headerNames[$normalized] = $header;
+                $this->headers[$header] = $value;
+            }
+        }
+    }
+    /**
+     * @param mixed $value
+     *
+     * @return string[]
+     */
+    private function normalizeHeaderValue($value) : array
+    {
+        if (!\is_array($value)) {
+            return $this->trimAndValidateHeaderValues([$value]);
+        }
+        if (\count($value) === 0) {
+            throw new \InvalidArgumentException('Header value can not be an empty array.');
+        }
+        return $this->trimAndValidateHeaderValues($value);
+    }
+    /**
+     * Trims whitespace from the header values.
+     *
+     * Spaces and tabs ought to be excluded by parsers when extracting the field value from a header field.
+     *
+     * header-field = field-name ":" OWS field-value OWS
+     * OWS          = *( SP / HTAB )
+     *
+     * @param mixed[] $values Header values
+     *
+     * @return string[] Trimmed header values
+     *
+     * @see https://tools.ietf.org/html/rfc7230#section-3.2.4
+     */
+    private function trimAndValidateHeaderValues(array $values) : array
+    {
+        return \array_map(function ($value) {
+            if (!\is_scalar($value) && null !== $value) {
+                throw new \InvalidArgumentException(\sprintf('Header value must be scalar or null but %s provided.', \is_object($value) ? \get_class($value) : \gettype($value)));
+            }
+            $trimmed = \trim((string) $value, " \t");
+            $this->assertValue($trimmed);
+            return $trimmed;
+        }, \array_values($values));
+    }
+    /**
+     * @see https://tools.ietf.org/html/rfc7230#section-3.2
+     *
+     * @param mixed $header
+     */
+    private function assertHeader($header) : void
+    {
+        if (!\is_string($header)) {
+            throw new \InvalidArgumentException(\sprintf('Header name must be a string but %s provided.', \is_object($header) ? \get_class($header) : \gettype($header)));
+        }
+        if (!\preg_match('/^[a-zA-Z0-9\'`#$%&*+.^_|~!-]+$/D', $header)) {
+            throw new \InvalidArgumentException(\sprintf('"%s" is not valid header name.', $header));
+        }
+    }
+    /**
+     * @see https://tools.ietf.org/html/rfc7230#section-3.2
+     *
+     * field-value    = *( field-content / obs-fold )
+     * field-content  = field-vchar [ 1*( SP / HTAB ) field-vchar ]
+     * field-vchar    = VCHAR / obs-text
+     * VCHAR          = %x21-7E
+     * obs-text       = %x80-FF
+     * obs-fold       = CRLF 1*( SP / HTAB )
+     */
+    private function assertValue(string $value) : void
+    {
+        // The regular expression intentionally does not support the obs-fold production, because as
+        // per RFC 7230#3.2.4:
+        //
+        // A sender MUST NOT generate a message that includes
+        // line folding (i.e., that has any field-value that contains a match to
+        // the obs-fold rule) unless the message is intended for packaging
+        // within the message/http media type.
+        //
+        // Clients must not send a request with line folding and a server sending folded headers is
+        // likely very rare. Line folding is a fairly obscure feature of HTTP/1.1 and thus not accepting
+        // folding is not likely to break any legitimate use case.
+        if (!\preg_match('/^[\\x20\\x09\\x21-\\x7E\\x80-\\xFF]*$/D', $value)) {
+            throw new \InvalidArgumentException(\sprintf('"%s" is not valid header value.', $value));
+        }
+    }
+}

dependencies/guzzlehttp/psr7/src/MultipartStream.php

@@ -0,0 +1,122 @@
+<?php
+
+declare (strict_types=1);
+namespace WP_Ultimo\Dependencies\GuzzleHttp\Psr7;
+
+use WP_Ultimo\Dependencies\Psr\Http\Message\StreamInterface;
+/**
+ * Stream that when read returns bytes for a streaming multipart or
+ * multipart/form-data stream.
+ */
+final class MultipartStream implements StreamInterface
+{
+    use StreamDecoratorTrait;
+    /** @var string */
+    private $boundary;
+    /** @var StreamInterface */
+    private $stream;
+    /**
+     * @param array  $elements Array of associative arrays, each containing a
+     *                         required "name" key mapping to the form field,
+     *                         name, a required "contents" key mapping to a
+     *                         StreamInterface/resource/string, an optional
+     *                         "headers" associative array of custom headers,
+     *                         and an optional "filename" key mapping to a
+     *                         string to send as the filename in the part.
+     * @param string $boundary You can optionally provide a specific boundary
+     *
+     * @throws \InvalidArgumentException
+     */
+    public function __construct(array $elements = [], string $boundary = null)
+    {
+        $this->boundary = $boundary ?: \bin2hex(\random_bytes(20));
+        $this->stream = $this->createStream($elements);
+    }
+    public function getBoundary() : string
+    {
+        return $this->boundary;
+    }
+    public function isWritable() : bool
+    {
+        return \false;
+    }
+    /**
+     * Get the headers needed before transferring the content of a POST file
+     *
+     * @param array<string, string> $headers
+     */
+    private function getHeaders(array $headers) : string
+    {
+        $str = '';
+        foreach ($headers as $key => $value) {
+            $str .= "{$key}: {$value}\r\n";
+        }
+        return "--{$this->boundary}\r\n" . \trim($str) . "\r\n\r\n";
+    }
+    /**
+     * Create the aggregate stream that will be used to upload the POST data
+     */
+    protected function createStream(array $elements = []) : StreamInterface
+    {
+        $stream = new AppendStream();
+        foreach ($elements as $element) {
+            if (!\is_array($element)) {
+                throw new \UnexpectedValueException('An array is expected');
+            }
+            $this->addElement($stream, $element);
+        }
+        // Add the trailing boundary with CRLF
+        $stream->addStream(Utils::streamFor("--{$this->boundary}--\r\n"));
+        return $stream;
+    }
+    private function addElement(AppendStream $stream, array $element) : void
+    {
+        foreach (['contents', 'name'] as $key) {
+            if (!\array_key_exists($key, $element)) {
+                throw new \InvalidArgumentException("A '{$key}' key is required");
+            }
+        }
+        $element['contents'] = Utils::streamFor($element['contents']);
+        if (empty($element['filename'])) {
+            $uri = $element['contents']->getMetadata('uri');
+            if ($uri && \is_string($uri) && \substr($uri, 0, 6) !== 'php://' && \substr($uri, 0, 7) !== 'data://') {
+                $element['filename'] = $uri;
+            }
+        }
+        [$body, $headers] = $this->createElement($element['name'], $element['contents'], $element['filename'] ?? null, $element['headers'] ?? []);
+        $stream->addStream(Utils::streamFor($this->getHeaders($headers)));
+        $stream->addStream($body);
+        $stream->addStream(Utils::streamFor("\r\n"));
+    }
+    private function createElement(string $name, StreamInterface $stream, ?string $filename, array $headers) : array
+    {
+        // Set a default content-disposition header if one was no provided
+        $disposition = $this->getHeader($headers, 'content-disposition');
+        if (!$disposition) {
+            $headers['Content-Disposition'] = $filename === '0' || $filename ? \sprintf('form-data; name="%s"; filename="%s"', $name, \basename($filename)) : "form-data; name=\"{$name}\"";
+        }
+        // Set a default content-length header if one was no provided
+        $length = $this->getHeader($headers, 'content-length');
+        if (!$length) {
+            if ($length = $stream->getSize()) {
+                $headers['Content-Length'] = (string) $length;
+            }
+        }
+        // Set a default Content-Type if one was not supplied
+        $type = $this->getHeader($headers, 'content-type');
+        if (!$type && ($filename === '0' || $filename)) {
+            $headers['Content-Type'] = MimeType::fromFilename($filename) ?? 'application/octet-stream';
+        }
+        return [$stream, $headers];
+    }
+    private function getHeader(array $headers, string $key)
+    {
+        $lowercaseHeader = \strtolower($key);
+        foreach ($headers as $k => $v) {
+            if (\strtolower($k) === $lowercaseHeader) {
+                return $v;
+            }
+        }
+        return null;
+    }
+}

dependencies/guzzlehttp/psr7/src/NoSeekStream.php

@@ -0,0 +1,23 @@
+<?php
+
+declare (strict_types=1);
+namespace WP_Ultimo\Dependencies\GuzzleHttp\Psr7;
+
+use WP_Ultimo\Dependencies\Psr\Http\Message\StreamInterface;
+/**
+ * Stream decorator that prevents a stream from being seeked.
+ */
+final class NoSeekStream implements StreamInterface
+{
+    use StreamDecoratorTrait;
+    /** @var StreamInterface */
+    private $stream;
+    public function seek($offset, $whence = \SEEK_SET) : void
+    {
+        throw new \RuntimeException('Cannot seek a NoSeekStream');
+    }
+    public function isSeekable() : bool
+    {
+        return \false;
+    }
+}

dependencies/guzzlehttp/psr7/src/PumpStream.php

@@ -0,0 +1,149 @@
+<?php
+
+declare (strict_types=1);
+namespace WP_Ultimo\Dependencies\GuzzleHttp\Psr7;
+
+use WP_Ultimo\Dependencies\Psr\Http\Message\StreamInterface;
+/**
+ * Provides a read only stream that pumps data from a PHP callable.
+ *
+ * When invoking the provided callable, the PumpStream will pass the amount of
+ * data requested to read to the callable. The callable can choose to ignore
+ * this value and return fewer or more bytes than requested. Any extra data
+ * returned by the provided callable is buffered internally until drained using
+ * the read() function of the PumpStream. The provided callable MUST return
+ * false when there is no more data to read.
+ */
+final class PumpStream implements StreamInterface
+{
+    /** @var callable|null */
+    private $source;
+    /** @var int|null */
+    private $size;
+    /** @var int */
+    private $tellPos = 0;
+    /** @var array */
+    private $metadata;
+    /** @var BufferStream */
+    private $buffer;
+    /**
+     * @param callable(int): (string|false|null)  $source  Source of the stream data. The callable MAY
+     *                                                     accept an integer argument used to control the
+     *                                                     amount of data to return. The callable MUST
+     *                                                     return a string when called, or false|null on error
+     *                                                     or EOF.
+     * @param array{size?: int, metadata?: array} $options Stream options:
+     *                                                     - metadata: Hash of metadata to use with stream.
+     *                                                     - size: Size of the stream, if known.
+     */
+    public function __construct(callable $source, array $options = [])
+    {
+        $this->source = $source;
+        $this->size = $options['size'] ?? null;
+        $this->metadata = $options['metadata'] ?? [];
+        $this->buffer = new BufferStream();
+    }
+    public function __toString() : string
+    {
+        try {
+            return Utils::copyToString($this);
+        } catch (\Throwable $e) {
+            if (\PHP_VERSION_ID >= 70400) {
+                throw $e;
+            }
+            \trigger_error(\sprintf('%s::__toString exception: %s', self::class, (string) $e), \E_USER_ERROR);
+            return '';
+        }
+    }
+    public function close() : void
+    {
+        $this->detach();
+    }
+    public function detach()
+    {
+        $this->tellPos = 0;
+        $this->source = null;
+        return null;
+    }
+    public function getSize() : ?int
+    {
+        return $this->size;
+    }
+    public function tell() : int
+    {
+        return $this->tellPos;
+    }
+    public function eof() : bool
+    {
+        return $this->source === null;
+    }
+    public function isSeekable() : bool
+    {
+        return \false;
+    }
+    public function rewind() : void
+    {
+        $this->seek(0);
+    }
+    public function seek($offset, $whence = \SEEK_SET) : void
+    {
+        throw new \RuntimeException('Cannot seek a PumpStream');
+    }
+    public function isWritable() : bool
+    {
+        return \false;
+    }
+    public function write($string) : int
+    {
+        throw new \RuntimeException('Cannot write to a PumpStream');
+    }
+    public function isReadable() : bool
+    {
+        return \true;
+    }
+    public function read($length) : string
+    {
+        $data = $this->buffer->read($length);
+        $readLen = \strlen($data);
+        $this->tellPos += $readLen;
+        $remaining = $length - $readLen;
+        if ($remaining) {
+            $this->pump($remaining);
+            $data .= $this->buffer->read($remaining);
+            $this->tellPos += \strlen($data) - $readLen;
+        }
+        return $data;
+    }
+    public function getContents() : string
+    {
+        $result = '';
+        while (!$this->eof()) {
+            $result .= $this->read(1000000);
+        }
+        return $result;
+    }
+    /**
+     * @return mixed
+     */
+    public function getMetadata($key = null)
+    {
+        if (!$key) {
+            return $this->metadata;
+        }
+        return $this->metadata[$key] ?? null;
+    }
+    private function pump(int $length) : void
+    {
+        if ($this->source) {
+            do {
+                $data = \call_user_func($this->source, $length);
+                if ($data === \false || $data === null) {
+                    $this->source = null;
+                    return;
+                }
+                $this->buffer->write($data);
+                $length -= \strlen($data);
+            } while ($length > 0);
+        }
+    }
+}

dependencies/guzzlehttp/psr7/src/Query.php

@@ -0,0 +1,104 @@
+<?php
+
+declare (strict_types=1);
+namespace WP_Ultimo\Dependencies\GuzzleHttp\Psr7;
+
+final class Query
+{
+    /**
+     * Parse a query string into an associative array.
+     *
+     * If multiple values are found for the same key, the value of that key
+     * value pair will become an array. This function does not parse nested
+     * PHP style arrays into an associative array (e.g., `foo[a]=1&foo[b]=2`
+     * will be parsed into `['foo[a]' => '1', 'foo[b]' => '2'])`.
+     *
+     * @param string   $str         Query string to parse
+     * @param int|bool $urlEncoding How the query string is encoded
+     */
+    public static function parse(string $str, $urlEncoding = \true) : array
+    {
+        $result = [];
+        if ($str === '') {
+            return $result;
+        }
+        if ($urlEncoding === \true) {
+            $decoder = function ($value) {
+                return \rawurldecode(\str_replace('+', ' ', (string) $value));
+            };
+        } elseif ($urlEncoding === \PHP_QUERY_RFC3986) {
+            $decoder = 'rawurldecode';
+        } elseif ($urlEncoding === \PHP_QUERY_RFC1738) {
+            $decoder = 'urldecode';
+        } else {
+            $decoder = function ($str) {
+                return $str;
+            };
+        }
+        foreach (\explode('&', $str) as $kvp) {
+            $parts = \explode('=', $kvp, 2);
+            $key = $decoder($parts[0]);
+            $value = isset($parts[1]) ? $decoder($parts[1]) : null;
+            if (!\array_key_exists($key, $result)) {
+                $result[$key] = $value;
+            } else {
+                if (!\is_array($result[$key])) {
+                    $result[$key] = [$result[$key]];
+                }
+                $result[$key][] = $value;
+            }
+        }
+        return $result;
+    }
+    /**
+     * Build a query string from an array of key value pairs.
+     *
+     * This function can use the return value of `parse()` to build a query
+     * string. This function does not modify the provided keys when an array is
+     * encountered (like `http_build_query()` would).
+     *
+     * @param array     $params   Query string parameters.
+     * @param int|false $encoding Set to false to not encode, PHP_QUERY_RFC3986
+     *                            to encode using RFC3986, or PHP_QUERY_RFC1738
+     *                            to encode using RFC1738.
+     */
+    public static function build(array $params, $encoding = \PHP_QUERY_RFC3986) : string
+    {
+        if (!$params) {
+            return '';
+        }
+        if ($encoding === \false) {
+            $encoder = function (string $str) : string {
+                return $str;
+            };
+        } elseif ($encoding === \PHP_QUERY_RFC3986) {
+            $encoder = 'rawurlencode';
+        } elseif ($encoding === \PHP_QUERY_RFC1738) {
+            $encoder = 'urlencode';
+        } else {
+            throw new \InvalidArgumentException('Invalid type');
+        }
+        $qs = '';
+        foreach ($params as $k => $v) {
+            $k = $encoder((string) $k);
+            if (!\is_array($v)) {
+                $qs .= $k;
+                $v = \is_bool($v) ? (int) $v : $v;
+                if ($v !== null) {
+                    $qs .= '=' . $encoder((string) $v);
+                }
+                $qs .= '&';
+            } else {
+                foreach ($v as $vv) {
+                    $qs .= $k;
+                    $vv = \is_bool($vv) ? (int) $vv : $vv;
+                    if ($vv !== null) {
+                        $qs .= '=' . $encoder((string) $vv);
+                    }
+                    $qs .= '&';
+                }
+            }
+        }
+        return $qs ? (string) \substr($qs, 0, -1) : '';
+    }
+}

dependencies/guzzlehttp/psr7/src/Request.php

@@ -0,0 +1,124 @@
+<?php
+
+declare (strict_types=1);
+namespace WP_Ultimo\Dependencies\GuzzleHttp\Psr7;
+
+use InvalidArgumentException;
+use WP_Ultimo\Dependencies\Psr\Http\Message\RequestInterface;
+use WP_Ultimo\Dependencies\Psr\Http\Message\StreamInterface;
+use WP_Ultimo\Dependencies\Psr\Http\Message\UriInterface;
+/**
+ * PSR-7 request implementation.
+ */
+class Request implements RequestInterface
+{
+    use MessageTrait;
+    /** @var string */
+    private $method;
+    /** @var string|null */
+    private $requestTarget;
+    /** @var UriInterface */
+    private $uri;
+    /**
+     * @param string                               $method  HTTP method
+     * @param string|UriInterface                  $uri     URI
+     * @param array<string, string|string[]>       $headers Request headers
+     * @param string|resource|StreamInterface|null $body    Request body
+     * @param string                               $version Protocol version
+     */
+    public function __construct(string $method, $uri, array $headers = [], $body = null, string $version = '1.1')
+    {
+        $this->assertMethod($method);
+        if (!$uri instanceof UriInterface) {
+            $uri = new Uri($uri);
+        }
+        $this->method = \strtoupper($method);
+        $this->uri = $uri;
+        $this->setHeaders($headers);
+        $this->protocol = $version;
+        if (!isset($this->headerNames['host'])) {
+            $this->updateHostFromUri();
+        }
+        if ($body !== '' && $body !== null) {
+            $this->stream = Utils::streamFor($body);
+        }
+    }
+    public function getRequestTarget() : string
+    {
+        if ($this->requestTarget !== null) {
+            return $this->requestTarget;
+        }
+        $target = $this->uri->getPath();
+        if ($target === '') {
+            $target = '/';
+        }
+        if ($this->uri->getQuery() != '') {
+            $target .= '?' . $this->uri->getQuery();
+        }
+        return $target;
+    }
+    public function withRequestTarget($requestTarget) : RequestInterface
+    {
+        if (\preg_match('#\\s#', $requestTarget)) {
+            throw new InvalidArgumentException('Invalid request target provided; cannot contain whitespace');
+        }
+        $new = clone $this;
+        $new->requestTarget = $requestTarget;
+        return $new;
+    }
+    public function getMethod() : string
+    {
+        return $this->method;
+    }
+    public function withMethod($method) : RequestInterface
+    {
+        $this->assertMethod($method);
+        $new = clone $this;
+        $new->method = \strtoupper($method);
+        return $new;
+    }
+    public function getUri() : UriInterface
+    {
+        return $this->uri;
+    }
+    public function withUri(UriInterface $uri, $preserveHost = \false) : RequestInterface
+    {
+        if ($uri === $this->uri) {
+            return $this;
+        }
+        $new = clone $this;
+        $new->uri = $uri;
+        if (!$preserveHost || !isset($this->headerNames['host'])) {
+            $new->updateHostFromUri();
+        }
+        return $new;
+    }
+    private function updateHostFromUri() : void
+    {
+        $host = $this->uri->getHost();
+        if ($host == '') {
+            return;
+        }
+        if (($port = $this->uri->getPort()) !== null) {
+            $host .= ':' . $port;
+        }
+        if (isset($this->headerNames['host'])) {
+            $header = $this->headerNames['host'];
+        } else {
+            $header = 'Host';
+            $this->headerNames['host'] = 'Host';
+        }
+        // Ensure Host is the first header.
+        // See: http://tools.ietf.org/html/rfc7230#section-5.4
+        $this->headers = [$header => [$host]] + $this->headers;
+    }
+    /**
+     * @param mixed $method
+     */
+    private function assertMethod($method) : void
+    {
+        if (!\is_string($method) || $method === '') {
+            throw new InvalidArgumentException('Method must be a non-empty string.');
+        }
+    }
+}

dependencies/guzzlehttp/psr7/src/Response.php

@@ -0,0 +1,78 @@
+<?php
+
+declare (strict_types=1);
+namespace WP_Ultimo\Dependencies\GuzzleHttp\Psr7;
+
+use WP_Ultimo\Dependencies\Psr\Http\Message\ResponseInterface;
+use WP_Ultimo\Dependencies\Psr\Http\Message\StreamInterface;
+/**
+ * PSR-7 response implementation.
+ */
+class Response implements ResponseInterface
+{
+    use MessageTrait;
+    /** Map of standard HTTP status code/reason phrases */
+    private const PHRASES = [100 => 'Continue', 101 => 'Switching Protocols', 102 => 'Processing', 200 => 'OK', 201 => 'Created', 202 => 'Accepted', 203 => 'Non-Authoritative Information', 204 => 'No Content', 205 => 'Reset Content', 206 => 'Partial Content', 207 => 'Multi-status', 208 => 'Already Reported', 300 => 'Multiple Choices', 301 => 'Moved Permanently', 302 => 'Found', 303 => 'See Other', 304 => 'Not Modified', 305 => 'Use Proxy', 306 => 'Switch Proxy', 307 => 'Temporary Redirect', 308 => 'Permanent Redirect', 400 => 'Bad Request', 401 => 'Unauthorized', 402 => 'Payment Required', 403 => 'Forbidden', 404 => 'Not Found', 405 => 'Method Not Allowed', 406 => 'Not Acceptable', 407 => 'Proxy Authentication Required', 408 => 'Request Time-out', 409 => 'Conflict', 410 => 'Gone', 411 => 'Length Required', 412 => 'Precondition Failed', 413 => 'Request Entity Too Large', 414 => 'Request-URI Too Large', 415 => 'Unsupported Media Type', 416 => 'Requested range not satisfiable', 417 => 'Expectation Failed', 418 => 'I\'m a teapot', 422 => 'Unprocessable Entity', 423 => 'Locked', 424 => 'Failed Dependency', 425 => 'Unordered Collection', 426 => 'Upgrade Required', 428 => 'Precondition Required', 429 => 'Too Many Requests', 431 => 'Request Header Fields Too Large', 451 => 'Unavailable For Legal Reasons', 500 => 'Internal Server Error', 501 => 'Not Implemented', 502 => 'Bad Gateway', 503 => 'Service Unavailable', 504 => 'Gateway Time-out', 505 => 'HTTP Version not supported', 506 => 'Variant Also Negotiates', 507 => 'Insufficient Storage', 508 => 'Loop Detected', 510 => 'Not Extended', 511 => 'Network Authentication Required'];
+    /** @var string */
+    private $reasonPhrase;
+    /** @var int */
+    private $statusCode;
+    /**
+     * @param int                                  $status  Status code
+     * @param array<string, string|string[]>       $headers Response headers
+     * @param string|resource|StreamInterface|null $body    Response body
+     * @param string                               $version Protocol version
+     * @param string|null                          $reason  Reason phrase (when empty a default will be used based on the status code)
+     */
+    public function __construct(int $status = 200, array $headers = [], $body = null, string $version = '1.1', string $reason = null)
+    {
+        $this->assertStatusCodeRange($status);
+        $this->statusCode = $status;
+        if ($body !== '' && $body !== null) {
+            $this->stream = Utils::streamFor($body);
+        }
+        $this->setHeaders($headers);
+        if ($reason == '' && isset(self::PHRASES[$this->statusCode])) {
+            $this->reasonPhrase = self::PHRASES[$this->statusCode];
+        } else {
+            $this->reasonPhrase = (string) $reason;
+        }
+        $this->protocol = $version;
+    }
+    public function getStatusCode() : int
+    {
+        return $this->statusCode;
+    }
+    public function getReasonPhrase() : string
+    {
+        return $this->reasonPhrase;
+    }
+    public function withStatus($code, $reasonPhrase = '') : ResponseInterface
+    {
+        $this->assertStatusCodeIsInteger($code);
+        $code = (int) $code;
+        $this->assertStatusCodeRange($code);
+        $new = clone $this;
+        $new->statusCode = $code;
+        if ($reasonPhrase == '' && isset(self::PHRASES[$new->statusCode])) {
+            $reasonPhrase = self::PHRASES[$new->statusCode];
+        }
+        $new->reasonPhrase = (string) $reasonPhrase;
+        return $new;
+    }
+    /**
+     * @param mixed $statusCode
+     */
+    private function assertStatusCodeIsInteger($statusCode) : void
+    {
+        if (\filter_var($statusCode, \FILTER_VALIDATE_INT) === \false) {
+            throw new \InvalidArgumentException('Status code must be an integer value.');
+        }
+    }
+    private function assertStatusCodeRange(int $statusCode) : void
+    {
+        if ($statusCode < 100 || $statusCode >= 600) {
+            throw new \InvalidArgumentException('Status code must be an integer value between 1xx and 5xx.');
+        }
+    }
+}

dependencies/guzzlehttp/psr7/src/Rfc7230.php

@@ -0,0 +1,22 @@
+<?php
+
+declare (strict_types=1);
+namespace WP_Ultimo\Dependencies\GuzzleHttp\Psr7;
+
+/**
+ * @internal
+ */
+final class Rfc7230
+{
+    /**
+     * Header related regular expressions (based on amphp/http package)
+     *
+     * Note: header delimiter (\r\n) is modified to \r?\n to accept line feed only delimiters for BC reasons.
+     *
+     * @see https://github.com/amphp/http/blob/v1.0.1/src/Rfc7230.php#L12-L15
+     *
+     * @license https://github.com/amphp/http/blob/v1.0.1/LICENSE
+     */
+    public const HEADER_REGEX = "(^([^()<>@,;:\\\"/[\\]?={}\x01- ]++):[ \t]*+((?:[ \t]*+[!-~\x80-\xff]++)*+)[ \t]*+\r?\n)m";
+    public const HEADER_FOLD_REGEX = "(\r?\n[ \t]++)";
+}

dependencies/guzzlehttp/psr7/src/ServerRequest.php

@@ -0,0 +1,266 @@
+<?php
+
+declare (strict_types=1);
+namespace WP_Ultimo\Dependencies\GuzzleHttp\Psr7;
+
+use InvalidArgumentException;
+use WP_Ultimo\Dependencies\Psr\Http\Message\ServerRequestInterface;
+use WP_Ultimo\Dependencies\Psr\Http\Message\StreamInterface;
+use WP_Ultimo\Dependencies\Psr\Http\Message\UploadedFileInterface;
+use WP_Ultimo\Dependencies\Psr\Http\Message\UriInterface;
+/**
+ * Server-side HTTP request
+ *
+ * Extends the Request definition to add methods for accessing incoming data,
+ * specifically server parameters, cookies, matched path parameters, query
+ * string arguments, body parameters, and upload file information.
+ *
+ * "Attributes" are discovered via decomposing the request (and usually
+ * specifically the URI path), and typically will be injected by the application.
+ *
+ * Requests are considered immutable; all methods that might change state are
+ * implemented such that they retain the internal state of the current
+ * message and return a new instance that contains the changed state.
+ */
+class ServerRequest extends Request implements ServerRequestInterface
+{
+    /**
+     * @var array
+     */
+    private $attributes = [];
+    /**
+     * @var array
+     */
+    private $cookieParams = [];
+    /**
+     * @var array|object|null
+     */
+    private $parsedBody;
+    /**
+     * @var array
+     */
+    private $queryParams = [];
+    /**
+     * @var array
+     */
+    private $serverParams;
+    /**
+     * @var array
+     */
+    private $uploadedFiles = [];
+    /**
+     * @param string                               $method       HTTP method
+     * @param string|UriInterface                  $uri          URI
+     * @param array<string, string|string[]>       $headers      Request headers
+     * @param string|resource|StreamInterface|null $body         Request body
+     * @param string                               $version      Protocol version
+     * @param array                                $serverParams Typically the $_SERVER superglobal
+     */
+    public function __construct(string $method, $uri, array $headers = [], $body = null, string $version = '1.1', array $serverParams = [])
+    {
+        $this->serverParams = $serverParams;
+        parent::__construct($method, $uri, $headers, $body, $version);
+    }
+    /**
+     * Return an UploadedFile instance array.
+     *
+     * @param array $files An array which respect $_FILES structure
+     *
+     * @throws InvalidArgumentException for unrecognized values
+     */
+    public static function normalizeFiles(array $files) : array
+    {
+        $normalized = [];
+        foreach ($files as $key => $value) {
+            if ($value instanceof UploadedFileInterface) {
+                $normalized[$key] = $value;
+            } elseif (\is_array($value) && isset($value['tmp_name'])) {
+                $normalized[$key] = self::createUploadedFileFromSpec($value);
+            } elseif (\is_array($value)) {
+                $normalized[$key] = self::normalizeFiles($value);
+                continue;
+            } else {
+                throw new InvalidArgumentException('Invalid value in files specification');
+            }
+        }
+        return $normalized;
+    }
+    /**
+     * Create and return an UploadedFile instance from a $_FILES specification.
+     *
+     * If the specification represents an array of values, this method will
+     * delegate to normalizeNestedFileSpec() and return that return value.
+     *
+     * @param array $value $_FILES struct
+     *
+     * @return UploadedFileInterface|UploadedFileInterface[]
+     */
+    private static function createUploadedFileFromSpec(array $value)
+    {
+        if (\is_array($value['tmp_name'])) {
+            return self::normalizeNestedFileSpec($value);
+        }
+        return new UploadedFile($value['tmp_name'], (int) $value['size'], (int) $value['error'], $value['name'], $value['type']);
+    }
+    /**
+     * Normalize an array of file specifications.
+     *
+     * Loops through all nested files and returns a normalized array of
+     * UploadedFileInterface instances.
+     *
+     * @return UploadedFileInterface[]
+     */
+    private static function normalizeNestedFileSpec(array $files = []) : array
+    {
+        $normalizedFiles = [];
+        foreach (\array_keys($files['tmp_name']) as $key) {
+            $spec = ['tmp_name' => $files['tmp_name'][$key], 'size' => $files['size'][$key] ?? null, 'error' => $files['error'][$key] ?? null, 'name' => $files['name'][$key] ?? null, 'type' => $files['type'][$key] ?? null];
+            $normalizedFiles[$key] = self::createUploadedFileFromSpec($spec);
+        }
+        return $normalizedFiles;
+    }
+    /**
+     * Return a ServerRequest populated with superglobals:
+     * $_GET
+     * $_POST
+     * $_COOKIE
+     * $_FILES
+     * $_SERVER
+     */
+    public static function fromGlobals() : ServerRequestInterface
+    {
+        $method = $_SERVER['REQUEST_METHOD'] ?? 'GET';
+        $headers = \getallheaders();
+        $uri = self::getUriFromGlobals();
+        $body = new CachingStream(new LazyOpenStream('php://input', 'r+'));
+        $protocol = isset($_SERVER['SERVER_PROTOCOL']) ? \str_replace('HTTP/', '', $_SERVER['SERVER_PROTOCOL']) : '1.1';
+        $serverRequest = new ServerRequest($method, $uri, $headers, $body, $protocol, $_SERVER);
+        return $serverRequest->withCookieParams($_COOKIE)->withQueryParams($_GET)->withParsedBody($_POST)->withUploadedFiles(self::normalizeFiles($_FILES));
+    }
+    private static function extractHostAndPortFromAuthority(string $authority) : array
+    {
+        $uri = 'http://' . $authority;
+        $parts = \parse_url($uri);
+        if (\false === $parts) {
+            return [null, null];
+        }
+        $host = $parts['host'] ?? null;
+        $port = $parts['port'] ?? null;
+        return [$host, $port];
+    }
+    /**
+     * Get a Uri populated with values from $_SERVER.
+     */
+    public static function getUriFromGlobals() : UriInterface
+    {
+        $uri = new Uri('');
+        $uri = $uri->withScheme(!empty($_SERVER['HTTPS']) && $_SERVER['HTTPS'] !== 'off' ? 'https' : 'http');
+        $hasPort = \false;
+        if (isset($_SERVER['HTTP_HOST'])) {
+            [$host, $port] = self::extractHostAndPortFromAuthority($_SERVER['HTTP_HOST']);
+            if ($host !== null) {
+                $uri = $uri->withHost($host);
+            }
+            if ($port !== null) {
+                $hasPort = \true;
+                $uri = $uri->withPort($port);
+            }
+        } elseif (isset($_SERVER['SERVER_NAME'])) {
+            $uri = $uri->withHost($_SERVER['SERVER_NAME']);
+        } elseif (isset($_SERVER['SERVER_ADDR'])) {
+            $uri = $uri->withHost($_SERVER['SERVER_ADDR']);
+        }
+        if (!$hasPort && isset($_SERVER['SERVER_PORT'])) {
+            $uri = $uri->withPort($_SERVER['SERVER_PORT']);
+        }
+        $hasQuery = \false;
+        if (isset($_SERVER['REQUEST_URI'])) {
+            $requestUriParts = \explode('?', $_SERVER['REQUEST_URI'], 2);
+            $uri = $uri->withPath($requestUriParts[0]);
+            if (isset($requestUriParts[1])) {
+                $hasQuery = \true;
+                $uri = $uri->withQuery($requestUriParts[1]);
+            }
+        }
+        if (!$hasQuery && isset($_SERVER['QUERY_STRING'])) {
+            $uri = $uri->withQuery($_SERVER['QUERY_STRING']);
+        }
+        return $uri;
+    }
+    public function getServerParams() : array
+    {
+        return $this->serverParams;
+    }
+    public function getUploadedFiles() : array
+    {
+        return $this->uploadedFiles;
+    }
+    public function withUploadedFiles(array $uploadedFiles) : ServerRequestInterface
+    {
+        $new = clone $this;
+        $new->uploadedFiles = $uploadedFiles;
+        return $new;
+    }
+    public function getCookieParams() : array
+    {
+        return $this->cookieParams;
+    }
+    public function withCookieParams(array $cookies) : ServerRequestInterface
+    {
+        $new = clone $this;
+        $new->cookieParams = $cookies;
+        return $new;
+    }
+    public function getQueryParams() : array
+    {
+        return $this->queryParams;
+    }
+    public function withQueryParams(array $query) : ServerRequestInterface
+    {
+        $new = clone $this;
+        $new->queryParams = $query;
+        return $new;
+    }
+    /**
+     * @return array|object|null
+     */
+    public function getParsedBody()
+    {
+        return $this->parsedBody;
+    }
+    public function withParsedBody($data) : ServerRequestInterface
+    {
+        $new = clone $this;
+        $new->parsedBody = $data;
+        return $new;
+    }
+    public function getAttributes() : array
+    {
+        return $this->attributes;
+    }
+    /**
+     * @return mixed
+     */
+    public function getAttribute($attribute, $default = null)
+    {
+        if (\false === \array_key_exists($attribute, $this->attributes)) {
+            return $default;
+        }
+        return $this->attributes[$attribute];
+    }
+    public function withAttribute($attribute, $value) : ServerRequestInterface
+    {
+        $new = clone $this;
+        $new->attributes[$attribute] = $value;
+        return $new;
+    }
+    public function withoutAttribute($attribute) : ServerRequestInterface
+    {
+        if (\false === \array_key_exists($attribute, $this->attributes)) {
+            return $this;
+        }
+        $new = clone $this;
+        unset($new->attributes[$attribute]);
+        return $new;
+    }
+}

dependencies/guzzlehttp/psr7/src/Stream.php

@@ -0,0 +1,235 @@
+<?php
+
+declare (strict_types=1);
+namespace WP_Ultimo\Dependencies\GuzzleHttp\Psr7;
+
+use WP_Ultimo\Dependencies\Psr\Http\Message\StreamInterface;
+/**
+ * PHP stream implementation.
+ */
+class Stream implements StreamInterface
+{
+    /**
+     * @see http://php.net/manual/function.fopen.php
+     * @see http://php.net/manual/en/function.gzopen.php
+     */
+    private const READABLE_MODES = '/r|a\\+|ab\\+|w\\+|wb\\+|x\\+|xb\\+|c\\+|cb\\+/';
+    private const WRITABLE_MODES = '/a|w|r\\+|rb\\+|rw|x|c/';
+    /** @var resource */
+    private $stream;
+    /** @var int|null */
+    private $size;
+    /** @var bool */
+    private $seekable;
+    /** @var bool */
+    private $readable;
+    /** @var bool */
+    private $writable;
+    /** @var string|null */
+    private $uri;
+    /** @var mixed[] */
+    private $customMetadata;
+    /**
+     * This constructor accepts an associative array of options.
+     *
+     * - size: (int) If a read stream would otherwise have an indeterminate
+     *   size, but the size is known due to foreknowledge, then you can
+     *   provide that size, in bytes.
+     * - metadata: (array) Any additional metadata to return when the metadata
+     *   of the stream is accessed.
+     *
+     * @param resource                            $stream  Stream resource to wrap.
+     * @param array{size?: int, metadata?: array} $options Associative array of options.
+     *
+     * @throws \InvalidArgumentException if the stream is not a stream resource
+     */
+    public function __construct($stream, array $options = [])
+    {
+        if (!\is_resource($stream)) {
+            throw new \InvalidArgumentException('Stream must be a resource');
+        }
+        if (isset($options['size'])) {
+            $this->size = $options['size'];
+        }
+        $this->customMetadata = $options['metadata'] ?? [];
+        $this->stream = $stream;
+        $meta = \stream_get_meta_data($this->stream);
+        $this->seekable = $meta['seekable'];
+        $this->readable = (bool) \preg_match(self::READABLE_MODES, $meta['mode']);
+        $this->writable = (bool) \preg_match(self::WRITABLE_MODES, $meta['mode']);
+        $this->uri = $this->getMetadata('uri');
+    }
+    /**
+     * Closes the stream when the destructed
+     */
+    public function __destruct()
+    {
+        $this->close();
+    }
+    public function __toString() : string
+    {
+        try {
+            if ($this->isSeekable()) {
+                $this->seek(0);
+            }
+            return $this->getContents();
+        } catch (\Throwable $e) {
+            if (\PHP_VERSION_ID >= 70400) {
+                throw $e;
+            }
+            \trigger_error(\sprintf('%s::__toString exception: %s', self::class, (string) $e), \E_USER_ERROR);
+            return '';
+        }
+    }
+    public function getContents() : string
+    {
+        if (!isset($this->stream)) {
+            throw new \RuntimeException('Stream is detached');
+        }
+        if (!$this->readable) {
+            throw new \RuntimeException('Cannot read from non-readable stream');
+        }
+        return Utils::tryGetContents($this->stream);
+    }
+    public function close() : void
+    {
+        if (isset($this->stream)) {
+            if (\is_resource($this->stream)) {
+                \fclose($this->stream);
+            }
+            $this->detach();
+        }
+    }
+    public function detach()
+    {
+        if (!isset($this->stream)) {
+            return null;
+        }
+        $result = $this->stream;
+        unset($this->stream);
+        $this->size = $this->uri = null;
+        $this->readable = $this->writable = $this->seekable = \false;
+        return $result;
+    }
+    public function getSize() : ?int
+    {
+        if ($this->size !== null) {
+            return $this->size;
+        }
+        if (!isset($this->stream)) {
+            return null;
+        }
+        // Clear the stat cache if the stream has a URI
+        if ($this->uri) {
+            \clearstatcache(\true, $this->uri);
+        }
+        $stats = \fstat($this->stream);
+        if (\is_array($stats) && isset($stats['size'])) {
+            $this->size = $stats['size'];
+            return $this->size;
+        }
+        return null;
+    }
+    public function isReadable() : bool
+    {
+        return $this->readable;
+    }
+    public function isWritable() : bool
+    {
+        return $this->writable;
+    }
+    public function isSeekable() : bool
+    {
+        return $this->seekable;
+    }
+    public function eof() : bool
+    {
+        if (!isset($this->stream)) {
+            throw new \RuntimeException('Stream is detached');
+        }
+        return \feof($this->stream);
+    }
+    public function tell() : int
+    {
+        if (!isset($this->stream)) {
+            throw new \RuntimeException('Stream is detached');
+        }
+        $result = \ftell($this->stream);
+        if ($result === \false) {
+            throw new \RuntimeException('Unable to determine stream position');
+        }
+        return $result;
+    }
+    public function rewind() : void
+    {
+        $this->seek(0);
+    }
+    public function seek($offset, $whence = \SEEK_SET) : void
+    {
+        $whence = (int) $whence;
+        if (!isset($this->stream)) {
+            throw new \RuntimeException('Stream is detached');
+        }
+        if (!$this->seekable) {
+            throw new \RuntimeException('Stream is not seekable');
+        }
+        if (\fseek($this->stream, $offset, $whence) === -1) {
+            throw new \RuntimeException('Unable to seek to stream position ' . $offset . ' with whence ' . \var_export($whence, \true));
+        }
+    }
+    public function read($length) : string
+    {
+        if (!isset($this->stream)) {
+            throw new \RuntimeException('Stream is detached');
+        }
+        if (!$this->readable) {
+            throw new \RuntimeException('Cannot read from non-readable stream');
+        }
+        if ($length < 0) {
+            throw new \RuntimeException('Length parameter cannot be negative');
+        }
+        if (0 === $length) {
+            return '';
+        }
+        try {
+            $string = \fread($this->stream, $length);
+        } catch (\Exception $e) {
+            throw new \RuntimeException('Unable to read from stream', 0, $e);
+        }
+        if (\false === $string) {
+            throw new \RuntimeException('Unable to read from stream');
+        }
+        return $string;
+    }
+    public function write($string) : int
+    {
+        if (!isset($this->stream)) {
+            throw new \RuntimeException('Stream is detached');
+        }
+        if (!$this->writable) {
+            throw new \RuntimeException('Cannot write to a non-writable stream');
+        }
+        // We can't know the size after writing anything
+        $this->size = null;
+        $result = \fwrite($this->stream, $string);
+        if ($result === \false) {
+            throw new \RuntimeException('Unable to write to stream');
+        }
+        return $result;
+    }
+    /**
+     * @return mixed
+     */
+    public function getMetadata($key = null)
+    {
+        if (!isset($this->stream)) {
+            return $key ? null : [];
+        } elseif (!$key) {
+            return $this->customMetadata + \stream_get_meta_data($this->stream);
+        } elseif (isset($this->customMetadata[$key])) {
+            return $this->customMetadata[$key];
+        }
+        $meta = \stream_get_meta_data($this->stream);
+        return $meta[$key] ?? null;
+    }
+}

dependencies/guzzlehttp/psr7/src/StreamDecoratorTrait.php

@@ -0,0 +1,131 @@
+<?php
+
+declare (strict_types=1);
+namespace WP_Ultimo\Dependencies\GuzzleHttp\Psr7;
+
+use WP_Ultimo\Dependencies\Psr\Http\Message\StreamInterface;
+/**
+ * Stream decorator trait
+ *
+ * @property StreamInterface $stream
+ */
+trait StreamDecoratorTrait
+{
+    /**
+     * @param StreamInterface $stream Stream to decorate
+     */
+    public function __construct(StreamInterface $stream)
+    {
+        $this->stream = $stream;
+    }
+    /**
+     * Magic method used to create a new stream if streams are not added in
+     * the constructor of a decorator (e.g., LazyOpenStream).
+     *
+     * @return StreamInterface
+     */
+    public function __get(string $name)
+    {
+        if ($name === 'stream') {
+            $this->stream = $this->createStream();
+            return $this->stream;
+        }
+        throw new \UnexpectedValueException("{$name} not found on class");
+    }
+    public function __toString() : string
+    {
+        try {
+            if ($this->isSeekable()) {
+                $this->seek(0);
+            }
+            return $this->getContents();
+        } catch (\Throwable $e) {
+            if (\PHP_VERSION_ID >= 70400) {
+                throw $e;
+            }
+            \trigger_error(\sprintf('%s::__toString exception: %s', self::class, (string) $e), \E_USER_ERROR);
+            return '';
+        }
+    }
+    public function getContents() : string
+    {
+        return Utils::copyToString($this);
+    }
+    /**
+     * Allow decorators to implement custom methods
+     *
+     * @return mixed
+     */
+    public function __call(string $method, array $args)
+    {
+        /** @var callable $callable */
+        $callable = [$this->stream, $method];
+        $result = \call_user_func_array($callable, $args);
+        // Always return the wrapped object if the result is a return $this
+        return $result === $this->stream ? $this : $result;
+    }
+    public function close() : void
+    {
+        $this->stream->close();
+    }
+    /**
+     * @return mixed
+     */
+    public function getMetadata($key = null)
+    {
+        return $this->stream->getMetadata($key);
+    }
+    public function detach()
+    {
+        return $this->stream->detach();
+    }
+    public function getSize() : ?int
+    {
+        return $this->stream->getSize();
+    }
+    public function eof() : bool
+    {
+        return $this->stream->eof();
+    }
+    public function tell() : int
+    {
+        return $this->stream->tell();
+    }
+    public function isReadable() : bool
+    {
+        return $this->stream->isReadable();
+    }
+    public function isWritable() : bool
+    {
+        return $this->stream->isWritable();
+    }
+    public function isSeekable() : bool
+    {
+        return $this->stream->isSeekable();
+    }
+    public function rewind() : void
+    {
+        $this->seek(0);
+    }
+    public function seek($offset, $whence = \SEEK_SET) : void
+    {
+        $this->stream->seek($offset, $whence);
+    }
+    public function read($length) : string
+    {
+        return $this->stream->read($length);
+    }
+    public function write($string) : int
+    {
+        return $this->stream->write($string);
+    }
+    /**
+     * Implement in subclasses to dynamically create streams when requested.
+     *
+     * @throws \BadMethodCallException
+     */
+    protected function createStream() : StreamInterface
+    {
+        throw new \BadMethodCallException('Not implemented');
+    }
+}

dependencies/guzzlehttp/psr7/src/StreamWrapper.php

@@ -0,0 +1,114 @@
+<?php
+
+declare (strict_types=1);
+namespace WP_Ultimo\Dependencies\GuzzleHttp\Psr7;
+
+use WP_Ultimo\Dependencies\Psr\Http\Message\StreamInterface;
+/**
+ * Converts Guzzle streams into PHP stream resources.
+ *
+ * @see https://www.php.net/streamwrapper
+ */
+final class StreamWrapper
+{
+    /** @var resource */
+    public $context;
+    /** @var StreamInterface */
+    private $stream;
+    /** @var string r, r+, or w */
+    private $mode;
+    /**
+     * Returns a resource representing the stream.
+     *
+     * @param StreamInterface $stream The stream to get a resource for
+     *
+     * @return resource
+     *
+     * @throws \InvalidArgumentException if stream is not readable or writable
+     */
+    public static function getResource(StreamInterface $stream)
+    {
+        self::register();
+        if ($stream->isReadable()) {
+            $mode = $stream->isWritable() ? 'r+' : 'r';
+        } elseif ($stream->isWritable()) {
+            $mode = 'w';
+        } else {
+            throw new \InvalidArgumentException('The stream must be readable, ' . 'writable, or both.');
+        }
+        return \fopen('guzzle://stream', $mode, \false, self::createStreamContext($stream));
+    }
+    /**
+     * Creates a stream context that can be used to open a stream as a php stream resource.
+     *
+     * @return resource
+     */
+    public static function createStreamContext(StreamInterface $stream)
+    {
+        return \stream_context_create(['guzzle' => ['stream' => $stream]]);
+    }
+    /**
+     * Registers the stream wrapper if needed
+     */
+    public static function register() : void
+    {
+        if (!\in_array('guzzle', \stream_get_wrappers())) {
+            \stream_wrapper_register('guzzle', __CLASS__);
+        }
+    }
+    public function stream_open(string $path, string $mode, int $options, string &$opened_path = null) : bool
+    {
+        $options = \stream_context_get_options($this->context);
+        if (!isset($options['guzzle']['stream'])) {
+            return \false;
+        }
+        $this->mode = $mode;
+        $this->stream = $options['guzzle']['stream'];
+        return \true;
+    }
+    public function stream_read(int $count) : string
+    {
+        return $this->stream->read($count);
+    }
+    public function stream_write(string $data) : int
+    {
+        return $this->stream->write($data);
+    }
+    public function stream_tell() : int
+    {
+        return $this->stream->tell();
+    }
+    public function stream_eof() : bool
+    {
+        return $this->stream->eof();
+    }
+    public function stream_seek(int $offset, int $whence) : bool
+    {
+        $this->stream->seek($offset, $whence);
+        return \true;
+    }
+    /**
+     * @return resource|false
+     */
+    public function stream_cast(int $cast_as)
+    {
+        $stream = clone $this->stream;
+        $resource = $stream->detach();
+        return $resource ?? \false;
+    }
+    /**
+     * @return array<int|string, int>
+     */
+    public function stream_stat() : array
+    {
+        static $modeMap = ['r' => 33060, 'rb' => 33060, 'r+' => 33206, 'w' => 33188, 'wb' => 33188];
+        return ['dev' => 0, 'ino' => 0, 'mode' => $modeMap[$this->mode], 'nlink' => 0, 'uid' => 0, 'gid' => 0, 'rdev' => 0, 'size' => $this->stream->getSize() ?: 0, 'atime' => 0, 'mtime' => 0, 'ctime' => 0, 'blksize' => 0, 'blocks' => 0];
+    }
+    /**
+     * @return array<int|string, int>
+     */
+    public function url_stat(string $path, int $flags) : array
+    {
+        return ['dev' => 0, 'ino' => 0, 'mode' => 0, 'nlink' => 0, 'uid' => 0, 'gid' => 0, 'rdev' => 0, 'size' => 0, 'atime' => 0, 'mtime' => 0, 'ctime' => 0, 'blksize' => 0, 'blocks' => 0];
+    }
+}

dependencies/guzzlehttp/psr7/src/UploadedFile.php

@@ -0,0 +1,152 @@
+<?php
+
+declare (strict_types=1);
+namespace WP_Ultimo\Dependencies\GuzzleHttp\Psr7;
+
+use InvalidArgumentException;
+use WP_Ultimo\Dependencies\Psr\Http\Message\StreamInterface;
+use WP_Ultimo\Dependencies\Psr\Http\Message\UploadedFileInterface;
+use RuntimeException;
+class UploadedFile implements UploadedFileInterface
+{
+    private const ERRORS = [\UPLOAD_ERR_OK, \UPLOAD_ERR_INI_SIZE, \UPLOAD_ERR_FORM_SIZE, \UPLOAD_ERR_PARTIAL, \UPLOAD_ERR_NO_FILE, \UPLOAD_ERR_NO_TMP_DIR, \UPLOAD_ERR_CANT_WRITE, \UPLOAD_ERR_EXTENSION];
+    /**
+     * @var string|null
+     */
+    private $clientFilename;
+    /**
+     * @var string|null
+     */
+    private $clientMediaType;
+    /**
+     * @var int
+     */
+    private $error;
+    /**
+     * @var string|null
+     */
+    private $file;
+    /**
+     * @var bool
+     */
+    private $moved = \false;
+    /**
+     * @var int|null
+     */
+    private $size;
+    /**
+     * @var StreamInterface|null
+     */
+    private $stream;
+    /**
+     * @param StreamInterface|string|resource $streamOrFile
+     */
+    public function __construct($streamOrFile, ?int $size, int $errorStatus, string $clientFilename = null, string $clientMediaType = null)
+    {
+        $this->setError($errorStatus);
+        $this->size = $size;
+        $this->clientFilename = $clientFilename;
+        $this->clientMediaType = $clientMediaType;
+        if ($this->isOk()) {
+            $this->setStreamOrFile($streamOrFile);
+        }
+    }
+    /**
+     * Depending on the value set file or stream variable
+     *
+     * @param StreamInterface|string|resource $streamOrFile
+     *
+     * @throws InvalidArgumentException
+     */
+    private function setStreamOrFile($streamOrFile) : void
+    {
+        if (\is_string($streamOrFile)) {
+            $this->file = $streamOrFile;
+        } elseif (\is_resource($streamOrFile)) {
+            $this->stream = new Stream($streamOrFile);
+        } elseif ($streamOrFile instanceof StreamInterface) {
+            $this->stream = $streamOrFile;
+        } else {
+            throw new InvalidArgumentException('Invalid stream or file provided for UploadedFile');
+        }
+    }
+    /**
+     * @throws InvalidArgumentException
+     */
+    private function setError(int $error) : void
+    {
+        if (\false === \in_array($error, UploadedFile::ERRORS, \true)) {
+            throw new InvalidArgumentException('Invalid error status for UploadedFile');
+        }
+        $this->error = $error;
+    }
+    private function isStringNotEmpty($param) : bool
+    {
+        return \is_string($param) && \false === empty($param);
+    }
+    /**
+     * Return true if there is no upload error
+     */
+    private function isOk() : bool
+    {
+        return $this->error === \UPLOAD_ERR_OK;
+    }
+    public function isMoved() : bool
+    {
+        return $this->moved;
+    }
+    /**
+     * @throws RuntimeException if is moved or not ok
+     */
+    private function validateActive() : void
+    {
+        if (\false === $this->isOk()) {
+            throw new RuntimeException('Cannot retrieve stream due to upload error');
+        }
+        if ($this->isMoved()) {
+            throw new RuntimeException('Cannot retrieve stream after it has already been moved');
+        }
+    }
+    public function getStream() : StreamInterface
+    {
+        $this->validateActive();
+        if ($this->stream instanceof StreamInterface) {
+            return $this->stream;
+        }
+        /** @var string $file */
+        $file = $this->file;
+        return new LazyOpenStream($file, 'r+');
+    }
+    public function moveTo($targetPath) : void
+    {
+        $this->validateActive();
+        if (\false === $this->isStringNotEmpty($targetPath)) {
+            throw new InvalidArgumentException('Invalid path provided for move operation; must be a non-empty string');
+        }
+        if ($this->file) {
+            $this->moved = \PHP_SAPI === 'cli' ? \rename($this->file, $targetPath) : \move_uploaded_file($this->file, $targetPath);
+        } else {
+            Utils::copyToStream($this->getStream(), new LazyOpenStream($targetPath, 'w'));
+            $this->moved = \true;
+        }
+        if (\false === $this->moved) {
+            throw new RuntimeException(\sprintf('Uploaded file could not be moved to %s', $targetPath));
+        }
+    }
+    public function getSize() : ?int
+    {
+        return $this->size;
+    }
+    public function getError() : int
+    {
+        return $this->error;
+    }
+    public function getClientFilename() : ?string
+    {
+        return $this->clientFilename;
+    }
+    public function getClientMediaType() : ?string
+    {
+        return $this->clientMediaType;
+    }
+}

dependencies/guzzlehttp/psr7/src/Uri.php

@@ -0,0 +1,570 @@
+<?php
+
+declare (strict_types=1);
+namespace WP_Ultimo\Dependencies\GuzzleHttp\Psr7;
+
+use WP_Ultimo\Dependencies\GuzzleHttp\Psr7\Exception\MalformedUriException;
+use WP_Ultimo\Dependencies\Psr\Http\Message\UriInterface;
+/**
+ * PSR-7 URI implementation.
+ *
+ * @author Michael Dowling
+ * @author Tobias Schultze
+ * @author Matthew Weier O'Phinney
+ */
+class Uri implements UriInterface, \JsonSerializable
+{
+    /**
+     * Absolute http and https URIs require a host per RFC 7230 Section 2.7
+     * but in generic URIs the host can be empty. So for http(s) URIs
+     * we apply this default host when no host is given yet to form a
+     * valid URI.
+     */
+    private const HTTP_DEFAULT_HOST = 'localhost';
+    private const DEFAULT_PORTS = ['http' => 80, 'https' => 443, 'ftp' => 21, 'gopher' => 70, 'nntp' => 119, 'news' => 119, 'telnet' => 23, 'tn3270' => 23, 'imap' => 143, 'pop' => 110, 'ldap' => 389];
+    /**
+     * Unreserved characters for use in a regex.
+     *
+     * @see https://tools.ietf.org/html/rfc3986#section-2.3
+     */
+    private const CHAR_UNRESERVED = 'a-zA-Z0-9_\\-\\.~';
+    /**
+     * Sub-delims for use in a regex.
+     *
+     * @see https://tools.ietf.org/html/rfc3986#section-2.2
+     */
+    private const CHAR_SUB_DELIMS = '!\\$&\'\\(\\)\\*\\+,;=';
+    private const QUERY_SEPARATORS_REPLACEMENT = ['=' => '%3D', '&' => '%26'];
+    /** @var string Uri scheme. */
+    private $scheme = '';
+    /** @var string Uri user info. */
+    private $userInfo = '';
+    /** @var string Uri host. */
+    private $host = '';
+    /** @var int|null Uri port. */
+    private $port;
+    /** @var string Uri path. */
+    private $path = '';
+    /** @var string Uri query string. */
+    private $query = '';
+    /** @var string Uri fragment. */
+    private $fragment = '';
+    /** @var string|null String representation */
+    private $composedComponents;
+    public function __construct(string $uri = '')
+    {
+        if ($uri !== '') {
+            $parts = self::parse($uri);
+            if ($parts === \false) {
+                throw new MalformedUriException("Unable to parse URI: {$uri}");
+            }
+            $this->applyParts($parts);
+        }
+    }
+    /**
+     * UTF-8 aware \parse_url() replacement.
+     *
+     * The internal function produces broken output for non ASCII domain names
+     * (IDN) when used with locales other than "C".
+     *
+     * On the other hand, cURL understands IDN correctly only when UTF-8 locale
+     * is configured ("C.UTF-8", "en_US.UTF-8", etc.).
+     *
+     * @see https://bugs.php.net/bug.php?id=52923
+     * @see https://www.php.net/manual/en/function.parse-url.php#114817
+     * @see https://curl.haxx.se/libcurl/c/CURLOPT_URL.html#ENCODING
+     *
+     * @return array|false
+     */
+    private static function parse(string $url)
+    {
+        // If IPv6
+        $prefix = '';
+        if (\preg_match('%^(.*://\\[[0-9:a-f]+\\])(.*?)$%', $url, $matches)) {
+            /** @var array{0:string, 1:string, 2:string} $matches */
+            $prefix = $matches[1];
+            $url = $matches[2];
+        }
+        /** @var string */
+        $encodedUrl = \preg_replace_callback('%[^:/@?&=#]+%usD', static function ($matches) {
+            return \urlencode($matches[0]);
+        }, $url);
+        $result = \parse_url($prefix . $encodedUrl);
+        if ($result === \false) {
+            return \false;
+        }
+        return \array_map('urldecode', $result);
+    }
+    public function __toString() : string
+    {
+        if ($this->composedComponents === null) {
+            $this->composedComponents = self::composeComponents($this->scheme, $this->getAuthority(), $this->path, $this->query, $this->fragment);
+        }
+        return $this->composedComponents;
+    }
+    /**
+     * Composes a URI reference string from its various components.
+     *
+     * Usually this method does not need to be called manually but instead is used indirectly via
+     * `Psr\Http\Message\UriInterface::__toString`.
+     *
+     * PSR-7 UriInterface treats an empty component the same as a missing component as
+     * getQuery(), getFragment() etc. always return a string. This explains the slight
+     * difference to RFC 3986 Section 5.3.
+     *
+     * Another adjustment is that the authority separator is added even when the authority is missing/empty
+     * for the "file" scheme. This is because PHP stream functions like `file_get_contents` only work with
+     * `file:///myfile` but not with `file:/myfile` although they are equivalent according to RFC 3986. But
+     * `file:///` is the more common syntax for the file scheme anyway (Chrome for example redirects to
+     * that format).
+     *
+     * @see https://tools.ietf.org/html/rfc3986#section-5.3
+     */
+    public static function composeComponents(?string $scheme, ?string $authority, string $path, ?string $query, ?string $fragment) : string
+    {
+        $uri = '';
+        // weak type checks to also accept null until we can add scalar type hints
+        if ($scheme != '') {
+            $uri .= $scheme . ':';
+        }
+        if ($authority != '' || $scheme === 'file') {
+            $uri .= '//' . $authority;
+        }
+        if ($authority != '' && $path != '' && $path[0] != '/') {
+            $path = '/' . $path;
+        }
+        $uri .= $path;
+        if ($query != '') {
+            $uri .= '?' . $query;
+        }
+        if ($fragment != '') {
+            $uri .= '#' . $fragment;
+        }
+        return $uri;
+    }
+    /**
+     * Whether the URI has the default port of the current scheme.
+     *
+     * `Psr\Http\Message\UriInterface::getPort` may return null or the standard port. This method can be used
+     * independently of the implementation.
+     */
+    public static function isDefaultPort(UriInterface $uri) : bool
+    {
+        return $uri->getPort() === null || isset(self::DEFAULT_PORTS[$uri->getScheme()]) && $uri->getPort() === self::DEFAULT_PORTS[$uri->getScheme()];
+    }
+    /**
+     * Whether the URI is absolute, i.e. it has a scheme.
+     *
+     * An instance of UriInterface can either be an absolute URI or a relative reference. This method returns true
+     * if it is the former. An absolute URI has a scheme. A relative reference is used to express a URI relative
+     * to another URI, the base URI. Relative references can be divided into several forms:
+     * - network-path references, e.g. '//example.com/path'
+     * - absolute-path references, e.g. '/path'
+     * - relative-path references, e.g. 'subpath'
+     *
+     * @see Uri::isNetworkPathReference
+     * @see Uri::isAbsolutePathReference
+     * @see Uri::isRelativePathReference
+     * @see https://tools.ietf.org/html/rfc3986#section-4
+     */
+    public static function isAbsolute(UriInterface $uri) : bool
+    {
+        return $uri->getScheme() !== '';
+    }
+    /**
+     * Whether the URI is a network-path reference.
+     *
+     * A relative reference that begins with two slash characters is termed an network-path reference.
+     *
+     * @see https://tools.ietf.org/html/rfc3986#section-4.2
+     */
+    public static function isNetworkPathReference(UriInterface $uri) : bool
+    {
+        return $uri->getScheme() === '' && $uri->getAuthority() !== '';
+    }
+    /**
+     * Whether the URI is a absolute-path reference.
+     *
+     * A relative reference that begins with a single slash character is termed an absolute-path reference.
+     *
+     * @see https://tools.ietf.org/html/rfc3986#section-4.2
+     */
+    public static function isAbsolutePathReference(UriInterface $uri) : bool
+    {
+        return $uri->getScheme() === '' && $uri->getAuthority() === '' && isset($uri->getPath()[0]) && $uri->getPath()[0] === '/';
+    }
+    /**
+     * Whether the URI is a relative-path reference.
+     *
+     * A relative reference that does not begin with a slash character is termed a relative-path reference.
+     *
+     * @see https://tools.ietf.org/html/rfc3986#section-4.2
+     */
+    public static function isRelativePathReference(UriInterface $uri) : bool
+    {
+        return $uri->getScheme() === '' && $uri->getAuthority() === '' && (!isset($uri->getPath()[0]) || $uri->getPath()[0] !== '/');
+    }
+    /**
+     * Whether the URI is a same-document reference.
+     *
+     * A same-document reference refers to a URI that is, aside from its fragment
+     * component, identical to the base URI. When no base URI is given, only an empty
+     * URI reference (apart from its fragment) is considered a same-document reference.
+     *
+     * @param UriInterface      $uri  The URI to check
+     * @param UriInterface|null $base An optional base URI to compare against
+     *
+     * @see https://tools.ietf.org/html/rfc3986#section-4.4
+     */
+    public static function isSameDocumentReference(UriInterface $uri, UriInterface $base = null) : bool
+    {
+        if ($base !== null) {
+            $uri = UriResolver::resolve($base, $uri);
+            return $uri->getScheme() === $base->getScheme() && $uri->getAuthority() === $base->getAuthority() && $uri->getPath() === $base->getPath() && $uri->getQuery() === $base->getQuery();
+        }
+        return $uri->getScheme() === '' && $uri->getAuthority() === '' && $uri->getPath() === '' && $uri->getQuery() === '';
+    }
+    /**
+     * Creates a new URI with a specific query string value removed.
+     *
+     * Any existing query string values that exactly match the provided key are
+     * removed.
+     *
+     * @param UriInterface $uri URI to use as a base.
+     * @param string       $key Query string key to remove.
+     */
+    public static function withoutQueryValue(UriInterface $uri, string $key) : UriInterface
+    {
+        $result = self::getFilteredQueryString($uri, [$key]);
+        return $uri->withQuery(\implode('&', $result));
+    }
+    /**
+     * Creates a new URI with a specific query string value.
+     *
+     * Any existing query string values that exactly match the provided key are
+     * removed and replaced with the given key value pair.
+     *
+     * A value of null will set the query string key without a value, e.g. "key"
+     * instead of "key=value".
+     *
+     * @param UriInterface $uri   URI to use as a base.
+     * @param string       $key   Key to set.
+     * @param string|null  $value Value to set
+     */
+    public static function withQueryValue(UriInterface $uri, string $key, ?string $value) : UriInterface
+    {
+        $result = self::getFilteredQueryString($uri, [$key]);
+        $result[] = self::generateQueryString($key, $value);
+        return $uri->withQuery(\implode('&', $result));
+    }
+    /**
+     * Creates a new URI with multiple specific query string values.
+     *
+     * It has the same behavior as withQueryValue() but for an associative array of key => value.
+     *
+     * @param UriInterface               $uri           URI to use as a base.
+     * @param array<string, string|null> $keyValueArray Associative array of key and values
+     */
+    public static function withQueryValues(UriInterface $uri, array $keyValueArray) : UriInterface
+    {
+        $result = self::getFilteredQueryString($uri, \array_keys($keyValueArray));
+        foreach ($keyValueArray as $key => $value) {
+            $result[] = self::generateQueryString((string) $key, $value !== null ? (string) $value : null);
+        }
+        return $uri->withQuery(\implode('&', $result));
+    }
+    /**
+     * Creates a URI from a hash of `parse_url` components.
+     *
+     * @see http://php.net/manual/en/function.parse-url.php
+     *
+     * @throws MalformedUriException If the components do not form a valid URI.
+     */
+    public static function fromParts(array $parts) : UriInterface
+    {
+        $uri = new self();
+        $uri->applyParts($parts);
+        $uri->validateState();
+        return $uri;
+    }
+    public function getScheme() : string
+    {
+        return $this->scheme;
+    }
+    public function getAuthority() : string
+    {
+        $authority = $this->host;
+        if ($this->userInfo !== '') {
+            $authority = $this->userInfo . '@' . $authority;
+        }
+        if ($this->port !== null) {
+            $authority .= ':' . $this->port;
+        }
+        return $authority;
+    }
+    public function getUserInfo() : string
+    {
+        return $this->userInfo;
+    }
+    public function getHost() : string
+    {
+        return $this->host;
+    }
+    public function getPort() : ?int
+    {
+        return $this->port;
+    }
+    public function getPath() : string
+    {
+        return $this->path;
+    }
+    public function getQuery() : string
+    {
+        return $this->query;
+    }
+    public function getFragment() : string
+    {
+        return $this->fragment;
+    }
+    public function withScheme($scheme) : UriInterface
+    {
+        $scheme = $this->filterScheme($scheme);
+        if ($this->scheme === $scheme) {
+            return $this;
+        }
+        $new = clone $this;
+        $new->scheme = $scheme;
+        $new->composedComponents = null;
+        $new->removeDefaultPort();
+        $new->validateState();
+        return $new;
+    }
+    public function withUserInfo($user, $password = null) : UriInterface
+    {
+        $info = $this->filterUserInfoComponent($user);
+        if ($password !== null) {
+            $info .= ':' . $this->filterUserInfoComponent($password);
+        }
+        if ($this->userInfo === $info) {
+            return $this;
+        }
+        $new = clone $this;
+        $new->userInfo = $info;
+        $new->composedComponents = null;
+        $new->validateState();
+        return $new;
+    }
+    public function withHost($host) : UriInterface
+    {
+        $host = $this->filterHost($host);
+        if ($this->host === $host) {
+            return $this;
+        }
+        $new = clone $this;
+        $new->host = $host;
+        $new->composedComponents = null;
+        $new->validateState();
+        return $new;
+    }
+    public function withPort($port) : UriInterface
+    {
+        $port = $this->filterPort($port);
+        if ($this->port === $port) {
+            return $this;
+        }
+        $new = clone $this;
+        $new->port = $port;
+        $new->composedComponents = null;
+        $new->removeDefaultPort();
+        $new->validateState();
+        return $new;
+    }
+    public function withPath($path) : UriInterface
+    {
+        $path = $this->filterPath($path);
+        if ($this->path === $path) {
+            return $this;
+        }
+        $new = clone $this;
+        $new->path = $path;
+        $new->composedComponents = null;
+        $new->validateState();
+        return $new;
+    }
+    public function withQuery($query) : UriInterface
+    {
+        $query = $this->filterQueryAndFragment($query);
+        if ($this->query === $query) {
+            return $this;
+        }
+        $new = clone $this;
+        $new->query = $query;
+        $new->composedComponents = null;
+        return $new;
+    }
+    public function withFragment($fragment) : UriInterface
+    {
+        $fragment = $this->filterQueryAndFragment($fragment);
+        if ($this->fragment === $fragment) {
+            return $this;
+        }
+        $new = clone $this;
+        $new->fragment = $fragment;
+        $new->composedComponents = null;
+        return $new;
+    }
+    public function jsonSerialize() : string
+    {
+        return $this->__toString();
+    }
+    /**
+     * Apply parse_url parts to a URI.
+     *
+     * @param array $parts Array of parse_url parts to apply.
+     */
+    private function applyParts(array $parts) : void
+    {
+        $this->scheme = isset($parts['scheme']) ? $this->filterScheme($parts['scheme']) : '';
+        $this->userInfo = isset($parts['user']) ? $this->filterUserInfoComponent($parts['user']) : '';
+        $this->host = isset($parts['host']) ? $this->filterHost($parts['host']) : '';
+        $this->port = isset($parts['port']) ? $this->filterPort($parts['port']) : null;
+        $this->path = isset($parts['path']) ? $this->filterPath($parts['path']) : '';
+        $this->query = isset($parts['query']) ? $this->filterQueryAndFragment($parts['query']) : '';
+        $this->fragment = isset($parts['fragment']) ? $this->filterQueryAndFragment($parts['fragment']) : '';
+        if (isset($parts['pass'])) {
+            $this->userInfo .= ':' . $this->filterUserInfoComponent($parts['pass']);
+        }
+        $this->removeDefaultPort();
+    }
+    /**
+     * @param mixed $scheme
+     *
+     * @throws \InvalidArgumentException If the scheme is invalid.
+     */
+    private function filterScheme($scheme) : string
+    {
+        if (!\is_string($scheme)) {
+            throw new \InvalidArgumentException('Scheme must be a string');
+        }
+        return \strtr($scheme, 'ABCDEFGHIJKLMNOPQRSTUVWXYZ', 'abcdefghijklmnopqrstuvwxyz');
+    }
+    /**
+     * @param mixed $component
+     *
+     * @throws \InvalidArgumentException If the user info is invalid.
+     */
+    private function filterUserInfoComponent($component) : string
+    {
+        if (!\is_string($component)) {
+            throw new \InvalidArgumentException('User info must be a string');
+        }
+        return \preg_replace_callback('/(?:[^%' . self::CHAR_UNRESERVED . self::CHAR_SUB_DELIMS . ']+|%(?![A-Fa-f0-9]{2}))/', [$this, 'rawurlencodeMatchZero'], $component);
+    }
+    /**
+     * @param mixed $host
+     *
+     * @throws \InvalidArgumentException If the host is invalid.
+     */
+    private function filterHost($host) : string
+    {
+        if (!\is_string($host)) {
+            throw new \InvalidArgumentException('Host must be a string');
+        }
+        return \strtr($host, 'ABCDEFGHIJKLMNOPQRSTUVWXYZ', 'abcdefghijklmnopqrstuvwxyz');
+    }
+    /**
+     * @param mixed $port
+     *
+     * @throws \InvalidArgumentException If the port is invalid.
+     */
+    private function filterPort($port) : ?int
+    {
+        if ($port === null) {
+            return null;
+        }
+        $port = (int) $port;
+        if (0 > $port || 0xffff < $port) {
+            throw new \InvalidArgumentException(\sprintf('Invalid port: %d. Must be between 0 and 65535', $port));
+        }
+        return $port;
+    }
+    /**
+     * @param string[] $keys
+     *
+     * @return string[]
+     */
+    private static function getFilteredQueryString(UriInterface $uri, array $keys) : array
+    {
+        $current = $uri->getQuery();
+        if ($current === '') {
+            return [];
+        }
+        $decodedKeys = \array_map('rawurldecode', $keys);
+        return \array_filter(\explode('&', $current), function ($part) use($decodedKeys) {
+            return !\in_array(\rawurldecode(\explode('=', $part)[0]), $decodedKeys, \true);
+        });
+    }
+    private static function generateQueryString(string $key, ?string $value) : string
+    {
+        // Query string separators ("=", "&") within the key or value need to be encoded
+        // (while preventing double-encoding) before setting the query string. All other
+        // chars that need percent-encoding will be encoded by withQuery().
+        $queryString = \strtr($key, self::QUERY_SEPARATORS_REPLACEMENT);
+        if ($value !== null) {
+            $queryString .= '=' . \strtr($value, self::QUERY_SEPARATORS_REPLACEMENT);
+        }
+        return $queryString;
+    }
+    private function removeDefaultPort() : void
+    {
+        if ($this->port !== null && self::isDefaultPort($this)) {
+            $this->port = null;
+        }
+    }
+    /**
+     * Filters the path of a URI
+     *
+     * @param mixed $path
+     *
+     * @throws \InvalidArgumentException If the path is invalid.
+     */
+    private function filterPath($path) : string
+    {
+        if (!\is_string($path)) {
+            throw new \InvalidArgumentException('Path must be a string');
+        }
+        return \preg_replace_callback('/(?:[^' . self::CHAR_UNRESERVED . self::CHAR_SUB_DELIMS . '%:@\\/]++|%(?![A-Fa-f0-9]{2}))/', [$this, 'rawurlencodeMatchZero'], $path);
+    }
+    /**
+     * Filters the query string or fragment of a URI.
+     *
+     * @param mixed $str
+     *
+     * @throws \InvalidArgumentException If the query or fragment is invalid.
+     */
+    private function filterQueryAndFragment($str) : string
+    {
+        if (!\is_string($str)) {
+            throw new \InvalidArgumentException('Query and fragment must be a string');
+        }
+        return \preg_replace_callback('/(?:[^' . self::CHAR_UNRESERVED . self::CHAR_SUB_DELIMS . '%:@\\/\\?]++|%(?![A-Fa-f0-9]{2}))/', [$this, 'rawurlencodeMatchZero'], $str);
+    }
+    private function rawurlencodeMatchZero(array $match) : string
+    {
+        return \rawurlencode($match[0]);
+    }
+    private function validateState() : void
+    {
+        if ($this->host === '' && ($this->scheme === 'http' || $this->scheme === 'https')) {
+            $this->host = self::HTTP_DEFAULT_HOST;
+        }
+        if ($this->getAuthority() === '') {
+            if (0 === \strpos($this->path, '//')) {
+                throw new MalformedUriException('The path of a URI without an authority must not start with two slashes "//"');
+            }
+            if ($this->scheme === '' && \false !== \strpos(\explode('/', $this->path, 2)[0], ':')) {
+                throw new MalformedUriException('A relative URI must not have a path beginning with a segment containing a colon');
+            }
+        }
+    }
+}

dependencies/guzzlehttp/psr7/src/UriComparator.php

@@ -0,0 +1,43 @@
+<?php
+
+declare (strict_types=1);
+namespace WP_Ultimo\Dependencies\GuzzleHttp\Psr7;
+
+use WP_Ultimo\Dependencies\Psr\Http\Message\UriInterface;
+/**
+ * Provides methods to determine if a modified URL should be considered cross-origin.
+ *
+ * @author Graham Campbell
+ */
+final class UriComparator
+{
+    /**
+     * Determines if a modified URL should be considered cross-origin with
+     * respect to an original URL.
+     */
+    public static function isCrossOrigin(UriInterface $original, UriInterface $modified) : bool
+    {
+        if (\strcasecmp($original->getHost(), $modified->getHost()) !== 0) {
+            return \true;
+        }
+        if ($original->getScheme() !== $modified->getScheme()) {
+            return \true;
+        }
+        if (self::computePort($original) !== self::computePort($modified)) {
+            return \true;
+        }
+        return \false;
+    }
+    private static function computePort(UriInterface $uri) : int
+    {
+        $port = $uri->getPort();
+        if (null !== $port) {
+            return $port;
+        }
+        return 'https' === $uri->getScheme() ? 443 : 80;
+    }
+    private function __construct()
+    {
+        // cannot be instantiated
+    }
+}

dependencies/guzzlehttp/psr7/src/UriNormalizer.php

@@ -0,0 +1,175 @@
+<?php
+
+declare (strict_types=1);
+namespace WP_Ultimo\Dependencies\GuzzleHttp\Psr7;
+
+use WP_Ultimo\Dependencies\Psr\Http\Message\UriInterface;
+/**
+ * Provides methods to normalize and compare URIs.
+ *
+ * @author Tobias Schultze
+ *
+ * @see https://tools.ietf.org/html/rfc3986#section-6
+ */
+final class UriNormalizer
+{
+    /**
+     * Default normalizations which only include the ones that preserve semantics.
+     */
+    public const PRESERVING_NORMALIZATIONS = self::CAPITALIZE_PERCENT_ENCODING | self::DECODE_UNRESERVED_CHARACTERS | self::CONVERT_EMPTY_PATH | self::REMOVE_DEFAULT_HOST | self::REMOVE_DEFAULT_PORT | self::REMOVE_DOT_SEGMENTS;
+    /**
+     * All letters within a percent-encoding triplet (e.g., "%3A") are case-insensitive, and should be capitalized.
+     *
+     * Example: http://example.org/a%c2%b1b → http://example.org/a%C2%B1b
+     */
+    public const CAPITALIZE_PERCENT_ENCODING = 1;
+    /**
+     * Decodes percent-encoded octets of unreserved characters.
+     *
+     * For consistency, percent-encoded octets in the ranges of ALPHA (%41–%5A and %61–%7A), DIGIT (%30–%39),
+     * hyphen (%2D), period (%2E), underscore (%5F), or tilde (%7E) should not be created by URI producers and,
+     * when found in a URI, should be decoded to their corresponding unreserved characters by URI normalizers.
+     *
+     * Example: http://example.org/%7Eusern%61me/ → http://example.org/~username/
+     */
+    public const DECODE_UNRESERVED_CHARACTERS = 2;
+    /**
+     * Converts the empty path to "/" for http and https URIs.
+     *
+     * Example: http://example.org → http://example.org/
+     */
+    public const CONVERT_EMPTY_PATH = 4;
+    /**
+     * Removes the default host of the given URI scheme from the URI.
+     *
+     * Only the "file" scheme defines the default host "localhost".
+     * All of `file:/myfile`, `file:///myfile`, and `file://localhost/myfile`
+     * are equivalent according to RFC 3986. The first format is not accepted
+     * by PHPs stream functions and thus already normalized implicitly to the
+     * second format in the Uri class. See `GuzzleHttp\Psr7\Uri::composeComponents`.
+     *
+     * Example: file://localhost/myfile → file:///myfile
+     */
+    public const REMOVE_DEFAULT_HOST = 8;
+    /**
+     * Removes the default port of the given URI scheme from the URI.
+     *
+     * Example: http://example.org:80/ → http://example.org/
+     */
+    public const REMOVE_DEFAULT_PORT = 16;
+    /**
+     * Removes unnecessary dot-segments.
+     *
+     * Dot-segments in relative-path references are not removed as it would
+     * change the semantics of the URI reference.
+     *
+     * Example: http://example.org/../a/b/../c/./d.html → http://example.org/a/c/d.html
+     */
+    public const REMOVE_DOT_SEGMENTS = 32;
+    /**
+     * Paths which include two or more adjacent slashes are converted to one.
+     *
+     * Webservers usually ignore duplicate slashes and treat those URIs equivalent.
+     * But in theory those URIs do not need to be equivalent. So this normalization
+     * may change the semantics. Encoded slashes (%2F) are not removed.
+     *
+     * Example: http://example.org//foo///bar.html → http://example.org/foo/bar.html
+     */
+    public const REMOVE_DUPLICATE_SLASHES = 64;
+    /**
+     * Sort query parameters with their values in alphabetical order.
+     *
+     * However, the order of parameters in a URI may be significant (this is not defined by the standard).
+     * So this normalization is not safe and may change the semantics of the URI.
+     *
+     * Example: ?lang=en&article=fred → ?article=fred&lang=en
+     *
+     * Note: The sorting is neither locale nor Unicode aware (the URI query does not get decoded at all) as the
+     * purpose is to be able to compare URIs in a reproducible way, not to have the params sorted perfectly.
+     */
+    public const SORT_QUERY_PARAMETERS = 128;
+    /**
+     * Returns a normalized URI.
+     *
+     * The scheme and host component are already normalized to lowercase per PSR-7 UriInterface.
+     * This methods adds additional normalizations that can be configured with the $flags parameter.
+     *
+     * PSR-7 UriInterface cannot distinguish between an empty component and a missing component as
+     * getQuery(), getFragment() etc. always return a string. This means the URIs "/?#" and "/" are
+     * treated equivalent which is not necessarily true according to RFC 3986. But that difference
+     * is highly uncommon in reality. So this potential normalization is implied in PSR-7 as well.
+     *
+     * @param UriInterface $uri   The URI to normalize
+     * @param int          $flags A bitmask of normalizations to apply, see constants
+     *
+     * @see https://tools.ietf.org/html/rfc3986#section-6.2
+     */
+    public static function normalize(UriInterface $uri, int $flags = self::PRESERVING_NORMALIZATIONS) : UriInterface
+    {
+        if ($flags & self::CAPITALIZE_PERCENT_ENCODING) {
+            $uri = self::capitalizePercentEncoding($uri);
+        }
+        if ($flags & self::DECODE_UNRESERVED_CHARACTERS) {
+            $uri = self::decodeUnreservedCharacters($uri);
+        }
+        if ($flags & self::CONVERT_EMPTY_PATH && $uri->getPath() === '' && ($uri->getScheme() === 'http' || $uri->getScheme() === 'https')) {
+            $uri = $uri->withPath('/');
+        }
+        if ($flags & self::REMOVE_DEFAULT_HOST && $uri->getScheme() === 'file' && $uri->getHost() === 'localhost') {
+            $uri = $uri->withHost('');
+        }
+        if ($flags & self::REMOVE_DEFAULT_PORT && $uri->getPort() !== null && Uri::isDefaultPort($uri)) {
+            $uri = $uri->withPort(null);
+        }
+        if ($flags & self::REMOVE_DOT_SEGMENTS && !Uri::isRelativePathReference($uri)) {
+            $uri = $uri->withPath(UriResolver::removeDotSegments($uri->getPath()));
+        }
+        if ($flags & self::REMOVE_DUPLICATE_SLASHES) {
+            $uri = $uri->withPath(\preg_replace('#//++#', '/', $uri->getPath()));
+        }
+        if ($flags & self::SORT_QUERY_PARAMETERS && $uri->getQuery() !== '') {
+            $queryKeyValues = \explode('&', $uri->getQuery());
+            \sort($queryKeyValues);
+            $uri = $uri->withQuery(\implode('&', $queryKeyValues));
+        }
+        return $uri;
+    }
+    /**
+     * Whether two URIs can be considered equivalent.
+     *
+     * Both URIs are normalized automatically before comparison with the given $normalizations bitmask. The method also
+     * accepts relative URI references and returns true when they are equivalent. This of course assumes they will be
+     * resolved against the same base URI. If this is not the case, determination of equivalence or difference of
+     * relative references does not mean anything.
+     *
+     * @param UriInterface $uri1           An URI to compare
+     * @param UriInterface $uri2           An URI to compare
+     * @param int          $normalizations A bitmask of normalizations to apply, see constants
+     *
+     * @see https://tools.ietf.org/html/rfc3986#section-6.1
+     */
+    public static function isEquivalent(UriInterface $uri1, UriInterface $uri2, int $normalizations = self::PRESERVING_NORMALIZATIONS) : bool
+    {
+        return (string) self::normalize($uri1, $normalizations) === (string) self::normalize($uri2, $normalizations);
+    }
+    private static function capitalizePercentEncoding(UriInterface $uri) : UriInterface
+    {
+        $regex = '/(?:%[A-Fa-f0-9]{2})++/';
+        $callback = function (array $match) {
+            return \strtoupper($match[0]);
+        };
+        return $uri->withPath(\preg_replace_callback($regex, $callback, $uri->getPath()))->withQuery(\preg_replace_callback($regex, $callback, $uri->getQuery()));
+    }
+    private static function decodeUnreservedCharacters(UriInterface $uri) : UriInterface
+    {
+        $regex = '/%(?:2D|2E|5F|7E|3[0-9]|[46][1-9A-F]|[57][0-9A])/i';
+        $callback = function (array $match) {
+            return \rawurldecode($match[0]);
+        };
+        return $uri->withPath(\preg_replace_callback($regex, $callback, $uri->getPath()))->withQuery(\preg_replace_callback($regex, $callback, $uri->getQuery()));
+    }
+    private function __construct()
+    {
+        // cannot be instantiated
+    }
+}

dependencies/guzzlehttp/psr7/src/UriResolver.php

@@ -0,0 +1,180 @@
+<?php
+
+declare (strict_types=1);
+namespace WP_Ultimo\Dependencies\GuzzleHttp\Psr7;
+
+use WP_Ultimo\Dependencies\Psr\Http\Message\UriInterface;
+/**
+ * Resolves a URI reference in the context of a base URI and the opposite way.
+ *
+ * @author Tobias Schultze
+ *
+ * @see https://tools.ietf.org/html/rfc3986#section-5
+ */
+final class UriResolver
+{
+    /**
+     * Removes dot segments from a path and returns the new path.
+     *
+     * @see http://tools.ietf.org/html/rfc3986#section-5.2.4
+     */
+    public static function removeDotSegments(string $path) : string
+    {
+        if ($path === '' || $path === '/') {
+            return $path;
+        }
+        $results = [];
+        $segments = \explode('/', $path);
+        foreach ($segments as $segment) {
+            if ($segment === '..') {
+                \array_pop($results);
+            } elseif ($segment !== '.') {
+                $results[] = $segment;
+            }
+        }
+        $newPath = \implode('/', $results);
+        if ($path[0] === '/' && (!isset($newPath[0]) || $newPath[0] !== '/')) {
+            // Re-add the leading slash if necessary for cases like "/.."
+            $newPath = '/' . $newPath;
+        } elseif ($newPath !== '' && ($segment === '.' || $segment === '..')) {
+            // Add the trailing slash if necessary
+            // If newPath is not empty, then $segment must be set and is the last segment from the foreach
+            $newPath .= '/';
+        }
+        return $newPath;
+    }
+    /**
+     * Converts the relative URI into a new URI that is resolved against the base URI.
+     *
+     * @see http://tools.ietf.org/html/rfc3986#section-5.2
+     */
+    public static function resolve(UriInterface $base, UriInterface $rel) : UriInterface
+    {
+        if ((string) $rel === '') {
+            // we can simply return the same base URI instance for this same-document reference
+            return $base;
+        }
+        if ($rel->getScheme() != '') {
+            return $rel->withPath(self::removeDotSegments($rel->getPath()));
+        }
+        if ($rel->getAuthority() != '') {
+            $targetAuthority = $rel->getAuthority();
+            $targetPath = self::removeDotSegments($rel->getPath());
+            $targetQuery = $rel->getQuery();
+        } else {
+            $targetAuthority = $base->getAuthority();
+            if ($rel->getPath() === '') {
+                $targetPath = $base->getPath();
+                $targetQuery = $rel->getQuery() != '' ? $rel->getQuery() : $base->getQuery();
+            } else {
+                if ($rel->getPath()[0] === '/') {
+                    $targetPath = $rel->getPath();
+                } else {
+                    if ($targetAuthority != '' && $base->getPath() === '') {
+                        $targetPath = '/' . $rel->getPath();
+                    } else {
+                        $lastSlashPos = \strrpos($base->getPath(), '/');
+                        if ($lastSlashPos === \false) {
+                            $targetPath = $rel->getPath();
+                        } else {
+                            $targetPath = \substr($base->getPath(), 0, $lastSlashPos + 1) . $rel->getPath();
+                        }
+                    }
+                }
+                $targetPath = self::removeDotSegments($targetPath);
+                $targetQuery = $rel->getQuery();
+            }
+        }
+        return new Uri(Uri::composeComponents($base->getScheme(), $targetAuthority, $targetPath, $targetQuery, $rel->getFragment()));
+    }
+    /**
+     * Returns the target URI as a relative reference from the base URI.
+     *
+     * This method is the counterpart to resolve():
+     *
+     *    (string) $target === (string) UriResolver::resolve($base, UriResolver::relativize($base, $target))
+     *
+     * One use-case is to use the current request URI as base URI and then generate relative links in your documents
+     * to reduce the document size or offer self-contained downloadable document archives.
+     *
+     *    $base = new Uri('http://example.com/a/b/');
+     *    echo UriResolver::relativize($base, new Uri('http://example.com/a/b/c'));  // prints 'c'.
+     *    echo UriResolver::relativize($base, new Uri('http://example.com/a/x/y'));  // prints '../x/y'.
+     *    echo UriResolver::relativize($base, new Uri('http://example.com/a/b/?q')); // prints '?q'.
+     *    echo UriResolver::relativize($base, new Uri('http://example.org/a/b/'));   // prints '//example.org/a/b/'.
+     *
+     * This method also accepts a target that is already relative and will try to relativize it further. Only a
+     * relative-path reference will be returned as-is.
+     *
+     *    echo UriResolver::relativize($base, new Uri('/a/b/c'));  // prints 'c' as well
+     */
+    public static function relativize(UriInterface $base, UriInterface $target) : UriInterface
+    {
+        if ($target->getScheme() !== '' && ($base->getScheme() !== $target->getScheme() || $target->getAuthority() === '' && $base->getAuthority() !== '')) {
+            return $target;
+        }
+        if (Uri::isRelativePathReference($target)) {
+            // As the target is already highly relative we return it as-is. It would be possible to resolve
+            // the target with `$target = self::resolve($base, $target);` and then try make it more relative
+            // by removing a duplicate query. But let's not do that automatically.
+            return $target;
+        }
+        if ($target->getAuthority() !== '' && $base->getAuthority() !== $target->getAuthority()) {
+            return $target->withScheme('');
+        }
+        // We must remove the path before removing the authority because if the path starts with two slashes, the URI
+        // would turn invalid. And we also cannot set a relative path before removing the authority, as that is also
+        // invalid.
+        $emptyPathUri = $target->withScheme('')->withPath('')->withUserInfo('')->withPort(null)->withHost('');
+        if ($base->getPath() !== $target->getPath()) {
+            return $emptyPathUri->withPath(self::getRelativePath($base, $target));
+        }
+        if ($base->getQuery() === $target->getQuery()) {
+            // Only the target fragment is left. And it must be returned even if base and target fragment are the same.
+            return $emptyPathUri->withQuery('');
+        }
+        // If the base URI has a query but the target has none, we cannot return an empty path reference as it would
+        // inherit the base query component when resolving.
+        if ($target->getQuery() === '') {
+            $segments = \explode('/', $target->getPath());
+            /** @var string $lastSegment */
+            $lastSegment = \end($segments);
+            return $emptyPathUri->withPath($lastSegment === '' ? './' : $lastSegment);
+        }
+        return $emptyPathUri;
+    }
+    private static function getRelativePath(UriInterface $base, UriInterface $target) : string
+    {
+        $sourceSegments = \explode('/', $base->getPath());
+        $targetSegments = \explode('/', $target->getPath());
+        \array_pop($sourceSegments);
+        $targetLastSegment = \array_pop($targetSegments);
+        foreach ($sourceSegments as $i => $segment) {
+            if (isset($targetSegments[$i]) && $segment === $targetSegments[$i]) {
+                unset($sourceSegments[$i], $targetSegments[$i]);
+            } else {
+                break;
+            }
+        }
+        $targetSegments[] = $targetLastSegment;
+        $relativePath = \str_repeat('../', \count($sourceSegments)) . \implode('/', $targetSegments);
+        // A reference to am empty last segment or an empty first sub-segment must be prefixed with "./".
+        // This also applies to a segment with a colon character (e.g., "file:colon") that cannot be used
+        // as the first segment of a relative-path reference, as it would be mistaken for a scheme name.
+        if ('' === $relativePath || \false !== \strpos(\explode('/', $relativePath, 2)[0], ':')) {
+            $relativePath = "./{$relativePath}";
+        } elseif ('/' === $relativePath[0]) {
+            if ($base->getAuthority() != '' && $base->getPath() === '') {
+                // In this case an extra slash is added by resolve() automatically. So we must not add one here.
+                $relativePath = ".{$relativePath}";
+            } else {
+                $relativePath = "./{$relativePath}";
+            }
+        }
+        return $relativePath;
+    }
+    private function __construct()
+    {
+        // cannot be instantiated
+    }
+}

dependencies/guzzlehttp/psr7/src/Utils.php

@@ -0,0 +1,375 @@
+<?php
+
+declare (strict_types=1);
+namespace WP_Ultimo\Dependencies\GuzzleHttp\Psr7;
+
+use WP_Ultimo\Dependencies\Psr\Http\Message\RequestInterface;
+use WP_Ultimo\Dependencies\Psr\Http\Message\ServerRequestInterface;
+use WP_Ultimo\Dependencies\Psr\Http\Message\StreamInterface;
+use WP_Ultimo\Dependencies\Psr\Http\Message\UriInterface;
+final class Utils
+{
+    /**
+     * Remove the items given by the keys, case insensitively from the data.
+     *
+     * @param string[] $keys
+     */
+    public static function caselessRemove(array $keys, array $data) : array
+    {
+        $result = [];
+        foreach ($keys as &$key) {
+            $key = \strtolower($key);
+        }
+        foreach ($data as $k => $v) {
+            if (!\is_string($k) || !\in_array(\strtolower($k), $keys)) {
+                $result[$k] = $v;
+            }
+        }
+        return $result;
+    }
+    /**
+     * Copy the contents of a stream into another stream until the given number
+     * of bytes have been read.
+     *
+     * @param StreamInterface $source Stream to read from
+     * @param StreamInterface $dest   Stream to write to
+     * @param int             $maxLen Maximum number of bytes to read. Pass -1
+     *                                to read the entire stream.
+     *
+     * @throws \RuntimeException on error.
+     */
+    public static function copyToStream(StreamInterface $source, StreamInterface $dest, int $maxLen = -1) : void
+    {
+        $bufferSize = 8192;
+        if ($maxLen === -1) {
+            while (!$source->eof()) {
+                if (!$dest->write($source->read($bufferSize))) {
+                    break;
+                }
+            }
+        } else {
+            $remaining = $maxLen;
+            while ($remaining > 0 && !$source->eof()) {
+                $buf = $source->read(\min($bufferSize, $remaining));
+                $len = \strlen($buf);
+                if (!$len) {
+                    break;
+                }
+                $remaining -= $len;
+                $dest->write($buf);
+            }
+        }
+    }
+    /**
+     * Copy the contents of a stream into a string until the given number of
+     * bytes have been read.
+     *
+     * @param StreamInterface $stream Stream to read
+     * @param int             $maxLen Maximum number of bytes to read. Pass -1
+     *                                to read the entire stream.
+     *
+     * @throws \RuntimeException on error.
+     */
+    public static function copyToString(StreamInterface $stream, int $maxLen = -1) : string
+    {
+        $buffer = '';
+        if ($maxLen === -1) {
+            while (!$stream->eof()) {
+                $buf = $stream->read(1048576);
+                if ($buf === '') {
+                    break;
+                }
+                $buffer .= $buf;
+            }
+            return $buffer;
+        }
+        $len = 0;
+        while (!$stream->eof() && $len < $maxLen) {
+            $buf = $stream->read($maxLen - $len);
+            if ($buf === '') {
+                break;
+            }
+            $buffer .= $buf;
+            $len = \strlen($buffer);
+        }
+        return $buffer;
+    }
+    /**
+     * Calculate a hash of a stream.
+     *
+     * This method reads the entire stream to calculate a rolling hash, based
+     * on PHP's `hash_init` functions.
+     *
+     * @param StreamInterface $stream    Stream to calculate the hash for
+     * @param string          $algo      Hash algorithm (e.g. md5, crc32, etc)
+     * @param bool            $rawOutput Whether or not to use raw output
+     *
+     * @throws \RuntimeException on error.
+     */
+    public static function hash(StreamInterface $stream, string $algo, bool $rawOutput = \false) : string
+    {
+        $pos = $stream->tell();
+        if ($pos > 0) {
+            $stream->rewind();
+        }
+        $ctx = \hash_init($algo);
+        while (!$stream->eof()) {
+            \hash_update($ctx, $stream->read(1048576));
+        }
+        $out = \hash_final($ctx, $rawOutput);
+        $stream->seek($pos);
+        return $out;
+    }
+    /**
+     * Clone and modify a request with the given changes.
+     *
+     * This method is useful for reducing the number of clones needed to mutate
+     * a message.
+     *
+     * The changes can be one of:
+     * - method: (string) Changes the HTTP method.
+     * - set_headers: (array) Sets the given headers.
+     * - remove_headers: (array) Remove the given headers.
+     * - body: (mixed) Sets the given body.
+     * - uri: (UriInterface) Set the URI.
+     * - query: (string) Set the query string value of the URI.
+     * - version: (string) Set the protocol version.
+     *
+     * @param RequestInterface $request Request to clone and modify.
+     * @param array            $changes Changes to apply.
+     */
+    public static function modifyRequest(RequestInterface $request, array $changes) : RequestInterface
+    {
+        if (!$changes) {
+            return $request;
+        }
+        $headers = $request->getHeaders();
+        if (!isset($changes['uri'])) {
+            $uri = $request->getUri();
+        } else {
+            // Remove the host header if one is on the URI
+            if ($host = $changes['uri']->getHost()) {
+                $changes['set_headers']['Host'] = $host;
+                if ($port = $changes['uri']->getPort()) {
+                    $standardPorts = ['http' => 80, 'https' => 443];
+                    $scheme = $changes['uri']->getScheme();
+                    if (isset($standardPorts[$scheme]) && $port != $standardPorts[$scheme]) {
+                        $changes['set_headers']['Host'] .= ':' . $port;
+                    }
+                }
+            }
+            $uri = $changes['uri'];
+        }
+        if (!empty($changes['remove_headers'])) {
+            $headers = self::caselessRemove($changes['remove_headers'], $headers);
+        }
+        if (!empty($changes['set_headers'])) {
+            $headers = self::caselessRemove(\array_keys($changes['set_headers']), $headers);
+            $headers = $changes['set_headers'] + $headers;
+        }
+        if (isset($changes['query'])) {
+            $uri = $uri->withQuery($changes['query']);
+        }
+        if ($request instanceof ServerRequestInterface) {
+            $new = (new ServerRequest($changes['method'] ?? $request->getMethod(), $uri, $headers, $changes['body'] ?? $request->getBody(), $changes['version'] ?? $request->getProtocolVersion(), $request->getServerParams()))->withParsedBody($request->getParsedBody())->withQueryParams($request->getQueryParams())->withCookieParams($request->getCookieParams())->withUploadedFiles($request->getUploadedFiles());
+            foreach ($request->getAttributes() as $key => $value) {
+                $new = $new->withAttribute($key, $value);
+            }
+            return $new;
+        }
+        return new Request($changes['method'] ?? $request->getMethod(), $uri, $headers, $changes['body'] ?? $request->getBody(), $changes['version'] ?? $request->getProtocolVersion());
+    }
+    /**
+     * Read a line from the stream up to the maximum allowed buffer length.
+     *
+     * @param StreamInterface $stream    Stream to read from
+     * @param int|null        $maxLength Maximum buffer length
+     */
+    public static function readLine(StreamInterface $stream, int $maxLength = null) : string
+    {
+        $buffer = '';
+        $size = 0;
+        while (!$stream->eof()) {
+            if ('' === ($byte = $stream->read(1))) {
+                return $buffer;
+            }
+            $buffer .= $byte;
+            // Break when a new line is found or the max length - 1 is reached
+            if ($byte === "\n" || ++$size === $maxLength - 1) {
+                break;
+            }
+        }
+        return $buffer;
+    }
+    /**
+     * Create a new stream based on the input type.
+     *
+     * Options is an associative array that can contain the following keys:
+     * - metadata: Array of custom metadata.
+     * - size: Size of the stream.
+     *
+     * This method accepts the following `$resource` types:
+     * - `Psr\Http\Message\StreamInterface`: Returns the value as-is.
+     * - `string`: Creates a stream object that uses the given string as the contents.
+     * - `resource`: Creates a stream object that wraps the given PHP stream resource.
+     * - `Iterator`: If the provided value implements `Iterator`, then a read-only
+     *   stream object will be created that wraps the given iterable. Each time the
+     *   stream is read from, data from the iterator will fill a buffer and will be
+     *   continuously called until the buffer is equal to the requested read size.
+     *   Subsequent read calls will first read from the buffer and then call `next`
+     *   on the underlying iterator until it is exhausted.
+     * - `object` with `__toString()`: If the object has the `__toString()` method,
+     *   the object will be cast to a string and then a stream will be returned that
+     *   uses the string value.
+     * - `NULL`: When `null` is passed, an empty stream object is returned.
+     * - `callable` When a callable is passed, a read-only stream object will be
+     *   created that invokes the given callable. The callable is invoked with the
+     *   number of suggested bytes to read. The callable can return any number of
+     *   bytes, but MUST return `false` when there is no more data to return. The
+     *   stream object that wraps the callable will invoke the callable until the
+     *   number of requested bytes are available. Any additional bytes will be
+     *   buffered and used in subsequent reads.
+     *
+     * @param resource|string|int|float|bool|StreamInterface|callable|\Iterator|null $resource Entity body data
+     * @param array{size?: int, metadata?: array}                                    $options  Additional options
+     *
+     * @throws \InvalidArgumentException if the $resource arg is not valid.
+     */
+    public static function streamFor($resource = '', array $options = []) : StreamInterface
+    {
+        if (\is_scalar($resource)) {
+            $stream = self::tryFopen('php://temp', 'r+');
+            if ($resource !== '') {
+                \fwrite($stream, (string) $resource);
+                \fseek($stream, 0);
+            }
+            return new Stream($stream, $options);
+        }
+        switch (\gettype($resource)) {
+            case 'resource':
+                /*
+                 * The 'php://input' is a special stream with quirks and inconsistencies.
+                 * We avoid using that stream by reading it into php://temp
+                 */
+                /** @var resource $resource */
+                if ((\stream_get_meta_data($resource)['uri'] ?? '') === 'php://input') {
+                    $stream = self::tryFopen('php://temp', 'w+');
+                    \stream_copy_to_stream($resource, $stream);
+                    \fseek($stream, 0);
+                    $resource = $stream;
+                }
+                return new Stream($resource, $options);
+            case 'object':
+                /** @var object $resource */
+                if ($resource instanceof StreamInterface) {
+                    return $resource;
+                } elseif ($resource instanceof \Iterator) {
+                    return new PumpStream(function () use($resource) {
+                        if (!$resource->valid()) {
+                            return \false;
+                        }
+                        $result = $resource->current();
+                        $resource->next();
+                        return $result;
+                    }, $options);
+                } elseif (\method_exists($resource, '__toString')) {
+                    return self::streamFor((string) $resource, $options);
+                }
+                break;
+            case 'NULL':
+                return new Stream(self::tryFopen('php://temp', 'r+'), $options);
+        }
+        if (\is_callable($resource)) {
+            return new PumpStream($resource, $options);
+        }
+        throw new \InvalidArgumentException('Invalid resource type: ' . \gettype($resource));
+    }
+    /**
+     * Safely opens a PHP stream resource using a filename.
+     *
+     * When fopen fails, PHP normally raises a warning. This function adds an
+     * error handler that checks for errors and throws an exception instead.
+     *
+     * @param string $filename File to open
+     * @param string $mode     Mode used to open the file
+     *
+     * @return resource
+     *
+     * @throws \RuntimeException if the file cannot be opened
+     */
+    public static function tryFopen(string $filename, string $mode)
+    {
+        $ex = null;
+        \set_error_handler(static function (int $errno, string $errstr) use($filename, $mode, &$ex) : bool {
+            $ex = new \RuntimeException(\sprintf('Unable to open "%s" using mode "%s": %s', $filename, $mode, $errstr));
+            return \true;
+        });
+        try {
+            /** @var resource $handle */
+            $handle = \fopen($filename, $mode);
+        } catch (\Throwable $e) {
+            $ex = new \RuntimeException(\sprintf('Unable to open "%s" using mode "%s": %s', $filename, $mode, $e->getMessage()), 0, $e);
+        }
+        \restore_error_handler();
+        if ($ex) {
+            /** @var $ex \RuntimeException */
+            throw $ex;
+        }
+        return $handle;
+    }
+    /**
+     * Safely gets the contents of a given stream.
+     *
+     * When stream_get_contents fails, PHP normally raises a warning. This
+     * function adds an error handler that checks for errors and throws an
+     * exception instead.
+     *
+     * @param resource $stream
+     *
+     * @throws \RuntimeException if the stream cannot be read
+     */
+    public static function tryGetContents($stream) : string
+    {
+        $ex = null;
+        \set_error_handler(static function (int $errno, string $errstr) use(&$ex) : bool {
+            $ex = new \RuntimeException(\sprintf('Unable to read stream contents: %s', $errstr));
+            return \true;
+        });
+        try {
+            /** @var string|false $contents */
+            $contents = \stream_get_contents($stream);
+            if ($contents === \false) {
+                $ex = new \RuntimeException('Unable to read stream contents');
+            }
+        } catch (\Throwable $e) {
+            $ex = new \RuntimeException(\sprintf('Unable to read stream contents: %s', $e->getMessage()), 0, $e);
+        }
+        \restore_error_handler();
+        if ($ex) {
+            /** @var $ex \RuntimeException */
+            throw $ex;
+        }
+        return $contents;
+    }
+    /**
+     * Returns a UriInterface for the given value.
+     *
+     * This function accepts a string or UriInterface and returns a
+     * UriInterface for the given value. If the value is already a
+     * UriInterface, it is returned as-is.
+     *
+     * @param string|UriInterface $uri
+     *
+     * @throws \InvalidArgumentException
+     */
+    public static function uriFor($uri) : UriInterface
+    {
+        if ($uri instanceof UriInterface) {
+            return $uri;
+        }
+        if (\is_string($uri)) {
+            return new Uri($uri);
+        }
+        throw new \InvalidArgumentException('URI must be a string or UriInterface');
+    }
+}