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| 1 | <?php |
| 2 | |
| 3 | /** |
| 4 | * Discovers plugin classes, optionally backed by a manifest cache. |
| 5 | * |
| 6 | * This Source Code Form is subject to the terms of the Mozilla Public License, |
| 7 | * v. 2.0. If a copy of the MPL was not distributed with this file, You can |
| 8 | * obtain one at https://mozilla.org/MPL/2.0/. |
| 9 | * |
| 10 | * @package phpMyFAQ |
| 11 | * @author Thorsten Rinne <thorsten@phpmyfaq.de> |
| 12 | * @copyright 2026 phpMyFAQ Team |
| 13 | * @license https://www.mozilla.org/MPL/2.0/ Mozilla Public License Version 2.0 |
| 14 | * @link https://www.phpmyfaq.de |
| 15 | * @since 2026-07-14 |
| 16 | */ |
| 17 | |
| 18 | declare(strict_types=1); |
| 19 | |
| 20 | namespace phpMyFAQ\Plugin; |
| 21 | |
| 22 | /** |
| 23 | * Class PluginDiscovery |
| 24 | * |
| 25 | * Maps plugin files to their fully qualified class names. Without a cache |
| 26 | * file every call scans the plugin directory and parses each plugin file for |
| 27 | * its namespace. With a cache file, the resulting class map is stored as a |
| 28 | * PHP manifest and reused as long as the directory signature (plugin root and |
| 29 | * per-plugin directory mtimes) is unchanged — so installing or removing a |
| 30 | * plugin invalidates the manifest automatically, without a manual cache |
| 31 | * clear. Editing the namespace inside an existing plugin file does not bump |
| 32 | * a directory mtime; that is a development workflow, where callers should |
| 33 | * pass no cache file. |
| 34 | */ |
| 35 | final class PluginDiscovery |
| 36 | { |
| 37 | public function __construct( |
| 38 | private readonly string $pluginDir, |
| 39 | private readonly ?string $cacheFile = null, |
| 40 | ) { |
| 41 | } |
| 42 | |
| 43 | /** |
| 44 | * @return array<string, string> plugin file path => fully qualified class name |
| 45 | */ |
| 46 | public function getClassMap(): array |
| 47 | { |
| 48 | if ($this->cacheFile === null) { |
| 49 | return $this->scan(); |
| 50 | } |
| 51 | |
| 52 | $signature = $this->computeSignature(); |
| 53 | $manifest = $this->readManifest(); |
| 54 | if ($manifest !== null && $manifest['signature'] === $signature) { |
| 55 | return $manifest['classMap']; |
| 56 | } |
| 57 | |
| 58 | $classMap = $this->scan(); |
| 59 | $this->writeManifest($signature, $classMap); |
| 60 | |
| 61 | return $classMap; |
| 62 | } |
| 63 | |
| 64 | /** |
| 65 | * @return array<string, string> |
| 66 | */ |
| 67 | private function scan(): array |
| 68 | { |
| 69 | $classMap = []; |
| 70 | $pluginFiles = glob($this->normalizedPluginDir() . '/*/*Plugin.php'); |
| 71 | |
| 72 | foreach ($pluginFiles === false ? [] : $pluginFiles as $pluginFile) { |
| 73 | $className = basename(path: $pluginFile, suffix: '.php'); |
| 74 | $namespace = $this->getNamespaceFromFile($pluginFile) ?? ''; |
| 75 | $classMap[$pluginFile] = $namespace . '\\' . $className; |
| 76 | } |
| 77 | |
| 78 | return $classMap; |
| 79 | } |
| 80 | |
| 81 | /** |
| 82 | * Signature over the plugin root and each plugin directory mtime. |
| 83 | */ |
| 84 | private function computeSignature(): string |
| 85 | { |
| 86 | $pluginDir = $this->normalizedPluginDir(); |
| 87 | $parts = [$pluginDir => $this->modificationTime($pluginDir)]; |
| 88 | |
| 89 | $subDirectories = glob($pluginDir . '/*', GLOB_ONLYDIR); |
| 90 | foreach ($subDirectories === false ? [] : $subDirectories as $subDirectory) { |
| 91 | $parts[$subDirectory] = $this->modificationTime($subDirectory); |
| 92 | } |
| 93 | |
| 94 | return md5(serialize($parts)); |
| 95 | } |
| 96 | |
| 97 | /** |
| 98 | * @return array{signature: string, classMap: array<string, string>}|null |
| 99 | */ |
| 100 | private function readManifest(): ?array |
| 101 | { |
| 102 | if ($this->cacheFile === null || !is_file($this->cacheFile)) { |
| 103 | return null; |
| 104 | } |
| 105 | |
| 106 | /** @var mixed $manifest */ |
| 107 | $manifest = include $this->cacheFile; |
| 108 | if ( |
| 109 | !is_array($manifest) |
| 110 | || !is_string($manifest['signature'] ?? null) |
| 111 | || !is_array($manifest['classMap'] ?? null) |
| 112 | ) { |
| 113 | return null; |
| 114 | } |
| 115 | |
| 116 | $classMap = []; |
| 117 | /** @var mixed $className */ |
| 118 | foreach ($manifest['classMap'] as $pluginFile => $className) { |
| 119 | if (!is_string($pluginFile) || !is_string($className)) { |
| 120 | return null; |
| 121 | } |
| 122 | |
| 123 | $classMap[$pluginFile] = $className; |
| 124 | } |
| 125 | |
| 126 | return ['signature' => $manifest['signature'], 'classMap' => $classMap]; |
| 127 | } |
| 128 | |
| 129 | /** |
| 130 | * @param array<string, string> $classMap |
| 131 | */ |
| 132 | private function writeManifest(string $signature, array $classMap): void |
| 133 | { |
| 134 | if ($this->cacheFile === null) { |
| 135 | return; |
| 136 | } |
| 137 | |
| 138 | $cacheDir = dirname($this->cacheFile); |
| 139 | if (!is_dir($cacheDir)) { |
| 140 | mkdir(directory: $cacheDir, permissions: 0o755, recursive: true); |
| 141 | } |
| 142 | |
| 143 | $manifest = ['signature' => $signature, 'classMap' => $classMap]; |
| 144 | $payload = "<?php\n\nreturn " . var_export($manifest, return: true) . ";\n"; |
| 145 | file_put_contents($this->cacheFile, $payload, LOCK_EX); |
| 146 | } |
| 147 | |
| 148 | private function getNamespaceFromFile(string $file): ?string |
| 149 | { |
| 150 | $src = file_get_contents($file); |
| 151 | $matches = []; |
| 152 | if ($src !== false && preg_match('/^namespace\s+(.+?);/m', $src, $matches)) { |
| 153 | return $matches[1]; |
| 154 | } |
| 155 | |
| 156 | return null; |
| 157 | } |
| 158 | |
| 159 | private function normalizedPluginDir(): string |
| 160 | { |
| 161 | return rtrim(string: $this->pluginDir, characters: '/'); |
| 162 | } |
| 163 | |
| 164 | private function modificationTime(string $directory): int |
| 165 | { |
| 166 | if (!is_dir($directory)) { |
| 167 | return 0; |
| 168 | } |
| 169 | |
| 170 | $modificationTime = filemtime($directory); |
| 171 | |
| 172 | return $modificationTime === false ? 0 : $modificationTime; |
| 173 | } |
| 174 | } |