MediaWiki REL1_30
FileContentsHasher.php
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1<?php
23
25 protected $cache;
26
28 private static $instance;
29
30 public function __construct() {
31 $this->cache = ObjectCache::getLocalServerInstance( 'hash' );
32 }
33
39 public static function singleton() {
40 if ( !self::$instance ) {
41 self::$instance = new self;
42 }
43
44 return self::$instance;
45 }
46
56 public function getFileContentsHashInternal( $filePath, $algo = 'md4' ) {
57 $mtime = filemtime( $filePath );
58 if ( $mtime === false ) {
59 return false;
60 }
61
62 $cacheKey = $this->cache->makeGlobalKey( __CLASS__, $filePath, $mtime, $algo );
63 $hash = $this->cache->get( $cacheKey );
64
65 if ( $hash ) {
66 return $hash;
67 }
68
69 $contents = file_get_contents( $filePath );
70 if ( $contents === false ) {
71 return false;
72 }
73
74 $hash = hash( $algo, $contents );
75 $this->cache->set( $cacheKey, $hash, 60 * 60 * 24 ); // 24h
76
77 return $hash;
78 }
79
89 public static function getFileContentsHash( $filePaths, $algo = 'md4' ) {
91
92 if ( !is_array( $filePaths ) ) {
93 $filePaths = (array)$filePaths;
94 }
95
96 MediaWiki\suppressWarnings();
97
98 if ( count( $filePaths ) === 1 ) {
99 $hash = $instance->getFileContentsHashInternal( $filePaths[0], $algo );
100 MediaWiki\restoreWarnings();
101 return $hash;
102 }
103
104 sort( $filePaths );
105 $hashes = array_map( function ( $filePath ) use ( $instance, $algo ) {
106 return $instance->getFileContentsHashInternal( $filePath, $algo ) ?: '';
107 }, $filePaths );
108
109 MediaWiki\restoreWarnings();
110
111 $hashes = implode( '', $hashes );
112 return $hashes ? hash( $algo, $hashes ) : false;
113 }
114}
interface is intended to be more or less compatible with the PHP memcached client.
Definition BagOStuff.php:47
static FileContentsHasher $instance
static getFileContentsHash( $filePaths, $algo='md4')
Get a hash of the combined contents of one or more files, either by retrieving a previously-computed ...
getFileContentsHashInternal( $filePath, $algo='md4')
Get a hash of a file's contents, either by retrieving a previously- computed hash from the cache,...
static singleton()
Get the singleton instance of this class.
the array() calling protocol came about after MediaWiki 1.4rc1.
you have access to all of the normal MediaWiki so you can get a DB use the cache