summaryrefslogtreecommitdiff
path: root/includes/filerepo/LocalRepo.php
blob: 926fd0b8a8f083bf0176efe33bd5173cc168bf2b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
<?php
/**
 * Local repository that stores files in the local filesystem and registers them
 * in the wiki's own database.
 *
 * 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
 * @ingroup FileRepo
 */

/**
 * A repository that stores files in the local filesystem and registers them
 * in the wiki's own database. This is the most commonly used repository class.
 *
 * @ingroup FileRepo
 */
class LocalRepo extends FileRepo {
	/** @var array */
	protected $fileFactory = array( 'LocalFile', 'newFromTitle' );

	/** @var array */
	protected $fileFactoryKey = array( 'LocalFile', 'newFromKey' );

	/** @var array */
	protected $fileFromRowFactory = array( 'LocalFile', 'newFromRow' );

	/** @var array */
	protected $oldFileFromRowFactory = array( 'OldLocalFile', 'newFromRow' );

	/** @var array */
	protected $oldFileFactory = array( 'OldLocalFile', 'newFromTitle' );

	/** @var array */
	protected $oldFileFactoryKey = array( 'OldLocalFile', 'newFromKey' );

	/**
	 * @throws MWException
	 * @param stdClass $row
	 * @return LocalFile
	 */
	function newFileFromRow( $row ) {
		if ( isset( $row->img_name ) ) {
			return call_user_func( $this->fileFromRowFactory, $row, $this );
		} elseif ( isset( $row->oi_name ) ) {
			return call_user_func( $this->oldFileFromRowFactory, $row, $this );
		} else {
			throw new MWException( __METHOD__ . ': invalid row' );
		}
	}

	/**
	 * @param Title $title
	 * @param string $archiveName
	 * @return OldLocalFile
	 */
	function newFromArchiveName( $title, $archiveName ) {
		return OldLocalFile::newFromArchiveName( $title, $this, $archiveName );
	}

	/**
	 * Delete files in the deleted directory if they are not referenced in the
	 * filearchive table. This needs to be done in the repo because it needs to
	 * interleave database locks with file operations, which is potentially a
	 * remote operation.
	 *
	 * @param array $storageKeys
	 *
	 * @return FileRepoStatus
	 */
	function cleanupDeletedBatch( array $storageKeys ) {
		$backend = $this->backend; // convenience
		$root = $this->getZonePath( 'deleted' );
		$dbw = $this->getMasterDB();
		$status = $this->newGood();
		$storageKeys = array_unique( $storageKeys );
		foreach ( $storageKeys as $key ) {
			$hashPath = $this->getDeletedHashPath( $key );
			$path = "$root/$hashPath$key";
			$dbw->begin( __METHOD__ );
			// Check for usage in deleted/hidden files and preemptively
			// lock the key to avoid any future use until we are finished.
			$deleted = $this->deletedFileHasKey( $key, 'lock' );
			$hidden = $this->hiddenFileHasKey( $key, 'lock' );
			if ( !$deleted && !$hidden ) { // not in use now
				wfDebug( __METHOD__ . ": deleting $key\n" );
				$op = array( 'op' => 'delete', 'src' => $path );
				if ( !$backend->doOperation( $op )->isOK() ) {
					$status->error( 'undelete-cleanup-error', $path );
					$status->failCount++;
				}
			} else {
				wfDebug( __METHOD__ . ": $key still in use\n" );
				$status->successCount++;
			}
			$dbw->commit( __METHOD__ );
		}

		return $status;
	}

	/**
	 * Check if a deleted (filearchive) file has this sha1 key
	 *
	 * @param string $key File storage key (base-36 sha1 key with file extension)
	 * @param string|null $lock Use "lock" to lock the row via FOR UPDATE
	 * @return bool File with this key is in use
	 */
	protected function deletedFileHasKey( $key, $lock = null ) {
		$options = ( $lock === 'lock' ) ? array( 'FOR UPDATE' ) : array();

		$dbw = $this->getMasterDB();

		return (bool)$dbw->selectField( 'filearchive', '1',
			array( 'fa_storage_group' => 'deleted', 'fa_storage_key' => $key ),
			__METHOD__, $options
		);
	}

	/**
	 * Check if a hidden (revision delete) file has this sha1 key
	 *
	 * @param string $key File storage key (base-36 sha1 key with file extension)
	 * @param string|null $lock Use "lock" to lock the row via FOR UPDATE
	 * @return bool File with this key is in use
	 */
	protected function hiddenFileHasKey( $key, $lock = null ) {
		$options = ( $lock === 'lock' ) ? array( 'FOR UPDATE' ) : array();

		$sha1 = self::getHashFromKey( $key );
		$ext = File::normalizeExtension( substr( $key, strcspn( $key, '.' ) + 1 ) );

		$dbw = $this->getMasterDB();

		return (bool)$dbw->selectField( 'oldimage', '1',
			array( 'oi_sha1' => $sha1,
				'oi_archive_name ' . $dbw->buildLike( $dbw->anyString(), ".$ext" ),
				$dbw->bitAnd( 'oi_deleted', File::DELETED_FILE ) => File::DELETED_FILE ),
			__METHOD__, $options
		);
	}

	/**
	 * Gets the SHA1 hash from a storage key
	 *
	 * @param string $key
	 * @return string
	 */
	public static function getHashFromKey( $key ) {
		return strtok( $key, '.' );
	}

	/**
	 * Checks if there is a redirect named as $title
	 *
	 * @param Title $title Title of file
	 * @return bool|Title
	 */
	function checkRedirect( Title $title ) {
		global $wgMemc;

		$title = File::normalizeTitle( $title, 'exception' );

		$memcKey = $this->getSharedCacheKey( 'image_redirect', md5( $title->getDBkey() ) );
		if ( $memcKey === false ) {
			$memcKey = $this->getLocalCacheKey( 'image_redirect', md5( $title->getDBkey() ) );
			$expiry = 300; // no invalidation, 5 minutes
		} else {
			$expiry = 86400; // has invalidation, 1 day
		}
		$cachedValue = $wgMemc->get( $memcKey );
		if ( $cachedValue === ' ' || $cachedValue === '' ) {
			// Does not exist
			return false;
		} elseif ( strval( $cachedValue ) !== '' && $cachedValue !== ' PURGED' ) {
			return Title::newFromText( $cachedValue, NS_FILE );
		} // else $cachedValue is false or null: cache miss

		$id = $this->getArticleID( $title );
		if ( !$id ) {
			$wgMemc->add( $memcKey, " ", $expiry );

			return false;
		}
		$dbr = $this->getSlaveDB();
		$row = $dbr->selectRow(
			'redirect',
			array( 'rd_title', 'rd_namespace' ),
			array( 'rd_from' => $id ),
			__METHOD__
		);

		if ( $row && $row->rd_namespace == NS_FILE ) {
			$targetTitle = Title::makeTitle( $row->rd_namespace, $row->rd_title );
			$wgMemc->add( $memcKey, $targetTitle->getDBkey(), $expiry );

			return $targetTitle;
		} else {
			$wgMemc->add( $memcKey, '', $expiry );

			return false;
		}
	}

	/**
	 * Function link Title::getArticleID().
	 * We can't say Title object, what database it should use, so we duplicate that function here.
	 *
	 * @param Title $title
	 * @return bool|int|mixed
	 */
	protected function getArticleID( $title ) {
		if ( !$title instanceof Title ) {
			return 0;
		}
		$dbr = $this->getSlaveDB();
		$id = $dbr->selectField(
			'page', // Table
			'page_id', //Field
			array( //Conditions
				'page_namespace' => $title->getNamespace(),
				'page_title' => $title->getDBkey(),
			),
			__METHOD__ //Function name
		);

		return $id;
	}

	public function findFiles( array $items, $flags = 0 ) {
		$finalFiles = array(); // map of (DB key => corresponding File) for matches

		$searchSet = array(); // map of (normalized DB key => search params)
		foreach ( $items as $item ) {
			if ( is_array( $item ) ) {
				$title = File::normalizeTitle( $item['title'] );
				if ( $title ) {
					$searchSet[$title->getDBkey()] = $item;
				}
			} else {
				$title = File::normalizeTitle( $item );
				if ( $title ) {
					$searchSet[$title->getDBkey()] = array();
				}
			}
		}

		$fileMatchesSearch = function ( File $file, array $search ) {
			// Note: file name comparison done elsewhere (to handle redirects)
			$user = ( !empty( $search['private'] ) && $search['private'] instanceof User )
				? $search['private']
				: null;

			return (
				$file->exists() &&
				(
					( empty( $search['time'] ) && !$file->isOld() ) ||
					( !empty( $search['time'] ) && $search['time'] === $file->getTimestamp() )
				) &&
				( !empty( $search['private'] ) || !$file->isDeleted( File::DELETED_FILE ) ) &&
				$file->userCan( File::DELETED_FILE, $user )
			);
		};

		$repo = $this;
		$applyMatchingFiles = function ( ResultWrapper $res, &$searchSet, &$finalFiles )
			use ( $repo, $fileMatchesSearch, $flags )
		{
			global $wgContLang;
			$info = $repo->getInfo();
			foreach ( $res as $row ) {
				$file = $repo->newFileFromRow( $row );
				// There must have been a search for this DB key, but this has to handle the
				// cases were title capitalization is different on the client and repo wikis.
				$dbKeysLook = array( str_replace( ' ', '_', $file->getName() ) );
				if ( !empty( $info['initialCapital'] ) ) {
					// Search keys for "hi.png" and "Hi.png" should use the "Hi.png file"
					$dbKeysLook[] = $wgContLang->lcfirst( $file->getName() );
				}
				foreach ( $dbKeysLook as $dbKey ) {
					if ( isset( $searchSet[$dbKey] )
						&& $fileMatchesSearch( $file, $searchSet[$dbKey] )
					) {
						$finalFiles[$dbKey] = ( $flags & FileRepo::NAME_AND_TIME_ONLY )
							? array( 'title' => $dbKey, 'timestamp' => $file->getTimestamp() )
							: $file;
						unset( $searchSet[$dbKey] );
					}
				}
			}
		};

		$dbr = $this->getSlaveDB();

		// Query image table
		$imgNames = array();
		foreach ( array_keys( $searchSet ) as $dbKey ) {
			$imgNames[] = $this->getNameFromTitle( File::normalizeTitle( $dbKey ) );
		}

		if ( count( $imgNames ) ) {
			$res = $dbr->select( 'image',
				LocalFile::selectFields(), array( 'img_name' => $imgNames ), __METHOD__ );
			$applyMatchingFiles( $res, $searchSet, $finalFiles );
		}

		// Query old image table
		$oiConds = array(); // WHERE clause array for each file
		foreach ( $searchSet as $dbKey => $search ) {
			if ( isset( $search['time'] ) ) {
				$oiConds[] = $dbr->makeList(
					array(
						'oi_name' => $this->getNameFromTitle( File::normalizeTitle( $dbKey ) ),
						'oi_timestamp' => $dbr->timestamp( $search['time'] )
					),
					LIST_AND
				);
			}
		}

		if ( count( $oiConds ) ) {
			$res = $dbr->select( 'oldimage',
				OldLocalFile::selectFields(), $dbr->makeList( $oiConds, LIST_OR ), __METHOD__ );
			$applyMatchingFiles( $res, $searchSet, $finalFiles );
		}

		// Check for redirects...
		foreach ( $searchSet as $dbKey => $search ) {
			if ( !empty( $search['ignoreRedirect'] ) ) {
				continue;
			}

			$title = File::normalizeTitle( $dbKey );
			$redir = $this->checkRedirect( $title ); // hopefully hits memcached

			if ( $redir && $redir->getNamespace() == NS_FILE ) {
				$file = $this->newFile( $redir );
				if ( $file && $fileMatchesSearch( $file, $search ) ) {
					$file->redirectedFrom( $title->getDBkey() );
					if ( $flags & FileRepo::NAME_AND_TIME_ONLY ) {
						$finalFiles[$dbKey] = array(
							'title' => $file->getTitle()->getDBkey(),
							'timestamp' => $file->getTimestamp()
						);
					} else {
						$finalFiles[$dbKey] = $file;
					}
				}
			}
		}

		return $finalFiles;
	}

	/**
	 * Get an array or iterator of file objects for files that have a given
	 * SHA-1 content hash.
	 *
	 * @param string $hash A sha1 hash to look for
	 * @return File[]
	 */
	function findBySha1( $hash ) {
		$dbr = $this->getSlaveDB();
		$res = $dbr->select(
			'image',
			LocalFile::selectFields(),
			array( 'img_sha1' => $hash ),
			__METHOD__,
			array( 'ORDER BY' => 'img_name' )
		);

		$result = array();
		foreach ( $res as $row ) {
			$result[] = $this->newFileFromRow( $row );
		}
		$res->free();

		return $result;
	}

	/**
	 * Get an array of arrays or iterators of file objects for files that
	 * have the given SHA-1 content hashes.
	 *
	 * Overrides generic implementation in FileRepo for performance reason
	 *
	 * @param array $hashes An array of hashes
	 * @return array An Array of arrays or iterators of file objects and the hash as key
	 */
	function findBySha1s( array $hashes ) {
		if ( !count( $hashes ) ) {
			return array(); //empty parameter
		}

		$dbr = $this->getSlaveDB();
		$res = $dbr->select(
			'image',
			LocalFile::selectFields(),
			array( 'img_sha1' => $hashes ),
			__METHOD__,
			array( 'ORDER BY' => 'img_name' )
		);

		$result = array();
		foreach ( $res as $row ) {
			$file = $this->newFileFromRow( $row );
			$result[$file->getSha1()][] = $file;
		}
		$res->free();

		return $result;
	}

	/**
	 * Return an array of files where the name starts with $prefix.
	 *
	 * @param string $prefix The prefix to search for
	 * @param int $limit The maximum amount of files to return
	 * @return array
	 */
	public function findFilesByPrefix( $prefix, $limit ) {
		$selectOptions = array( 'ORDER BY' => 'img_name', 'LIMIT' => intval( $limit ) );

		// Query database
		$dbr = $this->getSlaveDB();
		$res = $dbr->select(
			'image',
			LocalFile::selectFields(),
			'img_name ' . $dbr->buildLike( $prefix, $dbr->anyString() ),
			__METHOD__,
			$selectOptions
		);

		// Build file objects
		$files = array();
		foreach ( $res as $row ) {
			$files[] = $this->newFileFromRow( $row );
		}

		return $files;
	}

	/**
	 * Get a connection to the slave DB
	 * @return DatabaseBase
	 */
	function getSlaveDB() {
		return wfGetDB( DB_SLAVE );
	}

	/**
	 * Get a connection to the master DB
	 * @return DatabaseBase
	 */
	function getMasterDB() {
		return wfGetDB( DB_MASTER );
	}

	/**
	 * Get a key on the primary cache for this repository.
	 * Returns false if the repository's cache is not accessible at this site.
	 * The parameters are the parts of the key, as for wfMemcKey().
	 *
	 * @return string
	 */
	function getSharedCacheKey( /*...*/ ) {
		$args = func_get_args();

		return call_user_func_array( 'wfMemcKey', $args );
	}

	/**
	 * Invalidates image redirect cache related to that image
	 *
	 * @param Title $title Title of page
	 * @return void
	 */
	function invalidateImageRedirect( Title $title ) {
		global $wgMemc;
		$memcKey = $this->getSharedCacheKey( 'image_redirect', md5( $title->getDBkey() ) );
		if ( $memcKey ) {
			// Set a temporary value for the cache key, to ensure
			// that this value stays purged long enough so that
			// it isn't refreshed with a stale value due to a
			// lagged slave.
			$wgMemc->set( $memcKey, ' PURGED', 12 );
		}
	}

	/**
	 * Return information about the repository.
	 *
	 * @return array
	 * @since 1.22
	 */
	function getInfo() {
		global $wgFavicon;

		return array_merge( parent::getInfo(), array(
			'favicon' => wfExpandUrl( $wgFavicon ),
		) );
	}
}