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<?php use Wikimedia\ObjectCache\APCUBagOStuff; use Wikimedia\ObjectCache\BagOStuff; use Wikimedia\ObjectCache\EmptyBagOStuff; /** * Generate hash digests of file contents to help with cache invalidation. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License along * with this program; if not, write to the Free Software Foundation, Inc., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. * http://www.gnu.org/copyleft/gpl.html * * @file */ class FileContentsHasher { private const ALGO = 'md4'; /** @var BagOStuff */ protected $cache; /** @var FileContentsHasher */ private static $instance; public function __construct() { $this->cache = function_exists( 'apcu_fetch' ) ? new APCUBagOStuff() : new EmptyBagOStuff(); } /** * Get the singleton instance of this class. * * @return FileContentsHasher */ public static function singleton() { if ( !self::$instance ) { self::$instance = new self; } return self::$instance; } /** * Get a hash of a file's contents, either by retrieving a previously- * computed hash from the cache, or by computing a hash from the file. * * @param string $filePath Full path to the file. * @return string|bool Hash of file contents, or false if the file could not be read. */ private function getFileContentsHashInternal( $filePath ) { // phpcs:ignore Generic.PHP.NoSilencedErrors.Discouraged $mtime = @filemtime( $filePath ); if ( $mtime === false ) { return false; } $cacheKey = $this->cache->makeGlobalKey( __CLASS__, $filePath, $mtime, self::ALGO ); return $this->cache->getWithSetCallback( $cacheKey, $this->cache::TTL_DAY, static function () use ( $filePath ) { // phpcs:ignore Generic.PHP.NoSilencedErrors.Discouraged $contents = @file_get_contents( $filePath ); if ( $contents === false ) { // Don't cache false return false; } return hash( self::ALGO, $contents ); } ); } /** * Get a hash of the combined contents of one or more files, either by * retrieving a previously-computed hash from the cache, or by computing * a hash from the files. * * @param string|string[] $filePaths One or more file paths. * @return string|bool Hash of files' contents, or false if no file could not be read. */ public static function getFileContentsHash( $filePaths ) { $instance = self::singleton(); if ( !is_array( $filePaths ) ) { $filePaths = (array)$filePaths; } if ( count( $filePaths ) === 1 ) { $hash = $instance->getFileContentsHashInternal( $filePaths[0] ); return $hash; } sort( $filePaths ); $hashes = []; foreach ( $filePaths as $filePath ) { $hashes[] = $instance->getFileContentsHashInternal( $filePath ) ?: ''; } $hashes = implode( '', $hashes ); return $hashes ? hash( self::ALGO, $hashes ) : false; } }
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