Initial Commit

dependencies/amphp/dns/lib/functions.php

@@ -0,0 +1,92 @@
+<?php
+
+namespace WP_Ultimo\Dependencies\Amp\Dns;
+
+use WP_Ultimo\Dependencies\Amp\Loop;
+use WP_Ultimo\Dependencies\Amp\Promise;
+const LOOP_STATE_IDENTIFIER = Resolver::class;
+/**
+ * Retrieve the application-wide dns resolver instance.
+ *
+ * @param \Amp\Dns\Resolver $resolver Optionally specify a new default dns resolver instance
+ *
+ * @return \Amp\Dns\Resolver Returns the application-wide dns resolver instance
+ */
+function resolver(Resolver $resolver = null) : Resolver
+{
+    if ($resolver === null) {
+        $resolver = Loop::getState(LOOP_STATE_IDENTIFIER);
+        if ($resolver) {
+            return $resolver;
+        }
+        $resolver = createDefaultResolver();
+    }
+    Loop::setState(LOOP_STATE_IDENTIFIER, $resolver);
+    return $resolver;
+}
+/**
+ * Create a new dns resolver best-suited for the current environment.
+ *
+ * @return \Amp\Dns\Resolver
+ */
+function createDefaultResolver() : Resolver
+{
+    return new Rfc1035StubResolver();
+}
+/**
+ * @see Resolver::resolve()
+ */
+function resolve(string $name, int $typeRestriction = null) : Promise
+{
+    return resolver()->resolve($name, $typeRestriction);
+}
+/**
+ * @see Resolver::query()
+ */
+function query(string $name, int $type) : Promise
+{
+    return resolver()->query($name, $type);
+}
+/**
+ * Checks whether a string is a valid DNS name.
+ *
+ * @param string $name String to check.
+ *
+ * @return bool
+ */
+function isValidName(string $name)
+{
+    try {
+        normalizeName($name);
+        return \true;
+    } catch (InvalidNameException $e) {
+        return \false;
+    }
+}
+/**
+ * Normalizes a DNS name and automatically checks it for validity.
+ *
+ * @param string $name DNS name.
+ *
+ * @return string Normalized DNS name.
+ * @throws InvalidNameException If an invalid name or an IDN name without ext/intl being installed has been passed.
+ */
+function normalizeName(string $name) : string
+{
+    static $pattern = '/^(?<name>[a-z0-9]([a-z0-9-_]{0,61}[a-z0-9])?)(\\.(?&name))*\\.?$/i';
+    if (\function_exists('idn_to_ascii') && \defined('INTL_IDNA_VARIANT_UTS46')) {
+        if (\false === ($result = \idn_to_ascii($name, 0, \INTL_IDNA_VARIANT_UTS46))) {
+            throw new InvalidNameException("Name '{$name}' could not be processed for IDN.");
+        }
+        $name = $result;
+    } elseif (\preg_match('/[\\x80-\\xff]/', $name)) {
+        throw new InvalidNameException("Name '{$name}' contains non-ASCII characters and IDN support is not available. " . "Verify that ext/intl is installed for IDN support and that ICU is at least version 4.6.");
+    }
+    if (isset($name[253]) || !\preg_match($pattern, $name)) {
+        throw new InvalidNameException("Name '{$name}' is not a valid hostname.");
+    }
+    if ($name[\strlen($name) - 1] === '.') {
+        $name = \substr($name, 0, -1);
+    }
+    return $name;
+}