Initial Commit

dependencies/amphp/dns/lib/HostLoader.php

@@ -0,0 +1,70 @@
+<?php
+
+namespace WP_Ultimo\Dependencies\Amp\Dns;
+
+use WP_Ultimo\Dependencies\Amp\Failure;
+use WP_Ultimo\Dependencies\Amp\Promise;
+use WP_Ultimo\Dependencies\Amp\Success;
+use function WP_Ultimo\Dependencies\Amp\call;
+class HostLoader
+{
+    private $path;
+    public function __construct(string $path = null)
+    {
+        $this->path = $path ?? $this->getDefaultPath();
+    }
+    private function getDefaultPath() : string
+    {
+        return \stripos(\PHP_OS, "win") === 0 ? 'C:\\Windows\\system32\\drivers\\etc\\hosts' : '/etc/hosts';
+    }
+    protected function readFile(string $path) : Promise
+    {
+        \set_error_handler(function (int $errno, string $message) use($path) {
+            throw new ConfigException("Could not read configuration file '{$path}' ({$errno}) {$message}");
+        });
+        try {
+            // Blocking file access, but this file should be local and usually loaded only once.
+            $fileContent = \file_get_contents($path);
+        } catch (ConfigException $exception) {
+            return new Failure($exception);
+        } finally {
+            \restore_error_handler();
+        }
+        return new Success($fileContent);
+    }
+    public function loadHosts() : Promise
+    {
+        return call(function () {
+            try {
+                $contents = (yield $this->readFile($this->path));
+            } catch (ConfigException $exception) {
+                return [];
+            }
+            $data = [];
+            $lines = \array_filter(\array_map("trim", \explode("\n", $contents)));
+            foreach ($lines as $line) {
+                if ($line[0] === "#") {
+                    // Skip comments
+                    continue;
+                }
+                $parts = \preg_split('/\\s+/', $line);
+                if (!($ip = @\inet_pton($parts[0]))) {
+                    continue;
+                } elseif (isset($ip[4])) {
+                    $key = Record::AAAA;
+                } else {
+                    $key = Record::A;
+                }
+                for ($i = 1, $l = \count($parts); $i < $l; $i++) {
+                    try {
+                        $normalizedName = normalizeName($parts[$i]);
+                        $data[$key][$normalizedName] = $parts[0];
+                    } catch (InvalidNameException $e) {
+                        // ignore invalid entries
+                    }
+                }
+            }
+            return $data;
+        });
+    }
+}