summaryrefslogtreecommitdiff
path: root/includes/filerepo/ForeignAPIRepo.php
blob: 7ead968fdec75282c4ebb2523875785158c9efed (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
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
<?php
/**
 * Foreign repository accessible through api.php requests.
 *
 * 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 foreign repository with a remote MediaWiki with an API thingy
 *
 * Example config:
 *
 * $wgForeignFileRepos[] = array(
 *   'class'                  => 'ForeignAPIRepo',
 *   'name'                   => 'shared',
 *   'apibase'                => 'http://en.wikipedia.org/w/api.php',
 *   'fetchDescription'       => true, // Optional
 *   'descriptionCacheExpiry' => 3600,
 * );
 *
 * @ingroup FileRepo
 */
class ForeignAPIRepo extends FileRepo {
	/* This version string is used in the user agent for requests and will help
	 * server maintainers in identify ForeignAPI usage.
	 * Update the version every time you make breaking or significant changes. */
	const VERSION = "2.1";

	/**
	 * List of iiprop values for the thumbnail fetch queries.
	 * @since 1.23
	 */
	protected static $imageInfoProps = array(
		'url',
		'thumbnail',
		'timestamp',
	);

	protected $fileFactory = array( 'ForeignAPIFile', 'newFromTitle' );
	/** @var int Check back with Commons after a day (24*60*60) */
	protected $apiThumbCacheExpiry = 86400;

	/** @var int Redownload thumbnail files after a month (86400*30) */
	protected $fileCacheExpiry = 2592000;

	/** @var array */
	protected $mFileExists = array();

	/** @var array */
	private $mQueryCache = array();

	/**
	 * @param array|null $info
	 */
	function __construct( $info ) {
		global $wgLocalFileRepo;
		parent::__construct( $info );

		// http://commons.wikimedia.org/w/api.php
		$this->mApiBase = isset( $info['apibase'] ) ? $info['apibase'] : null;

		if ( isset( $info['apiThumbCacheExpiry'] ) ) {
			$this->apiThumbCacheExpiry = $info['apiThumbCacheExpiry'];
		}
		if ( isset( $info['fileCacheExpiry'] ) ) {
			$this->fileCacheExpiry = $info['fileCacheExpiry'];
		}
		if ( !$this->scriptDirUrl ) {
			// hack for description fetches
			$this->scriptDirUrl = dirname( $this->mApiBase );
		}
		// If we can cache thumbs we can guess sane defaults for these
		if ( $this->canCacheThumbs() && !$this->url ) {
			$this->url = $wgLocalFileRepo['url'];
		}
		if ( $this->canCacheThumbs() && !$this->thumbUrl ) {
			$this->thumbUrl = $this->url . '/thumb';
		}
	}

	/**
	 * @return string
	 * @since 1.22
	 */
	function getApiUrl() {
		return $this->mApiBase;
	}

	/**
	 * Per docs in FileRepo, this needs to return false if we don't support versioned
	 * files. Well, we don't.
	 *
	 * @param Title $title
	 * @param string|bool $time
	 * @return File
	 */
	function newFile( $title, $time = false ) {
		if ( $time ) {
			return false;
		}

		return parent::newFile( $title, $time );
	}

	/**
	 * @param array $files
	 * @return array
	 */
	function fileExistsBatch( array $files ) {
		$results = array();
		foreach ( $files as $k => $f ) {
			if ( isset( $this->mFileExists[$f] ) ) {
				$results[$k] = $this->mFileExists[$f];
				unset( $files[$k] );
			} elseif ( self::isVirtualUrl( $f ) ) {
				# @todo FIXME: We need to be able to handle virtual
				# URLs better, at least when we know they refer to the
				# same repo.
				$results[$k] = false;
				unset( $files[$k] );
			} elseif ( FileBackend::isStoragePath( $f ) ) {
				$results[$k] = false;
				unset( $files[$k] );
				wfWarn( "Got mwstore:// path '$f'." );
			}
		}

		$data = $this->fetchImageQuery( array(
			'titles' => implode( $files, '|' ),
			'prop' => 'imageinfo' )
		);

		if ( isset( $data['query']['pages'] ) ) {
			# First, get results from the query. Note we only care whether the image exists,
			# not whether it has a description page.
			foreach ( $data['query']['pages'] as $p ) {
				$this->mFileExists[$p['title']] = ( $p['imagerepository'] !== '' );
			}
			# Second, copy the results to any redirects that were queried
			if ( isset( $data['query']['redirects'] ) ) {
				foreach ( $data['query']['redirects'] as $r ) {
					$this->mFileExists[$r['from']] = $this->mFileExists[$r['to']];
				}
			}
			# Third, copy the results to any non-normalized titles that were queried
			if ( isset( $data['query']['normalized'] ) ) {
				foreach ( $data['query']['normalized'] as $n ) {
					$this->mFileExists[$n['from']] = $this->mFileExists[$n['to']];
				}
			}
			# Finally, copy the results to the output
			foreach ( $files as $key => $file ) {
				$results[$key] = $this->mFileExists[$file];
			}
		}

		return $results;
	}

	/**
	 * @param string $virtualUrl
	 * @return bool
	 */
	function getFileProps( $virtualUrl ) {
		return false;
	}

	/**
	 * @param array $query
	 * @return string
	 */
	function fetchImageQuery( $query ) {
		global $wgLanguageCode;

		$query = array_merge( $query,
			array(
				'format' => 'json',
				'action' => 'query',
				'redirects' => 'true'
			) );

		if ( !isset( $query['uselang'] ) ) { // uselang is unset or null
			$query['uselang'] = $wgLanguageCode;
		}

		$data = $this->httpGetCached( 'Metadata', $query );

		if ( $data ) {
			return FormatJson::decode( $data, true );
		} else {
			return null;
		}
	}

	/**
	 * @param array $data
	 * @return bool|array
	 */
	function getImageInfo( $data ) {
		if ( $data && isset( $data['query']['pages'] ) ) {
			foreach ( $data['query']['pages'] as $info ) {
				if ( isset( $info['imageinfo'][0] ) ) {
					return $info['imageinfo'][0];
				}
			}
		}

		return false;
	}

	/**
	 * @param string $hash
	 * @return array
	 */
	function findBySha1( $hash ) {
		$results = $this->fetchImageQuery( array(
			'aisha1base36' => $hash,
			'aiprop' => ForeignAPIFile::getProps(),
			'list' => 'allimages',
		) );
		$ret = array();
		if ( isset( $results['query']['allimages'] ) ) {
			foreach ( $results['query']['allimages'] as $img ) {
				// 1.14 was broken, doesn't return name attribute
				if ( !isset( $img['name'] ) ) {
					continue;
				}
				$ret[] = new ForeignAPIFile( Title::makeTitle( NS_FILE, $img['name'] ), $this, $img );
			}
		}

		return $ret;
	}

	/**
	 * @param string $name
	 * @param int $width
	 * @param int $height
	 * @param array $result Out parameter that will be changed by the function.
	 * @param string $otherParams
	 *
	 * @return bool
	 */
	function getThumbUrl( $name, $width = -1, $height = -1, &$result = null, $otherParams = '' ) {
		$data = $this->fetchImageQuery( array(
			'titles' => 'File:' . $name,
			'iiprop' => self::getIIProps(),
			'iiurlwidth' => $width,
			'iiurlheight' => $height,
			'iiurlparam' => $otherParams,
			'prop' => 'imageinfo' ) );
		$info = $this->getImageInfo( $data );

		if ( $data && $info && isset( $info['thumburl'] ) ) {
			wfDebug( __METHOD__ . " got remote thumb " . $info['thumburl'] . "\n" );
			$result = $info;

			return $info['thumburl'];
		} else {
			return false;
		}
	}

	/**
	 * @param string $name
	 * @param int $width
	 * @param int $height
	 * @param string $otherParams
	 * @param string $lang Language code for language of error
	 * @return bool|MediaTransformError
	 * @since 1.22
	 */
	function getThumbError( $name, $width = -1, $height = -1, $otherParams = '', $lang = null ) {
		$data = $this->fetchImageQuery( array(
			'titles' => 'File:' . $name,
			'iiprop' => self::getIIProps(),
			'iiurlwidth' => $width,
			'iiurlheight' => $height,
			'iiurlparam' => $otherParams,
			'prop' => 'imageinfo',
			'uselang' => $lang,
		) );
		$info = $this->getImageInfo( $data );

		if ( $data && $info && isset( $info['thumberror'] ) ) {
			wfDebug( __METHOD__ . " got remote thumb error " . $info['thumberror'] . "\n" );

			return new MediaTransformError(
				'thumbnail_error_remote',
				$width,
				$height,
				$this->getDisplayName(),
				$info['thumberror'] // already parsed message from foreign repo
			);
		} else {
			return false;
		}
	}

	/**
	 * Return the imageurl from cache if possible
	 *
	 * If the url has been requested today, get it from cache
	 * Otherwise retrieve remote thumb url, check for local file.
	 *
	 * @param string $name Is a dbkey form of a title
	 * @param int $width
	 * @param int $height
	 * @param string $params Other rendering parameters (page number, etc)
	 *   from handler's makeParamString.
	 * @return bool|string
	 */
	function getThumbUrlFromCache( $name, $width, $height, $params = "" ) {
		global $wgMemc;
		// We can't check the local cache using FileRepo functions because
		// we override fileExistsBatch(). We have to use the FileBackend directly.
		$backend = $this->getBackend(); // convenience

		if ( !$this->canCacheThumbs() ) {
			$result = null; // can't pass "null" by reference, but it's ok as default value
			return $this->getThumbUrl( $name, $width, $height, $result, $params );
		}
		$key = $this->getLocalCacheKey( 'ForeignAPIRepo', 'ThumbUrl', $name );
		$sizekey = "$width:$height:$params";

		/* Get the array of urls that we already know */
		$knownThumbUrls = $wgMemc->get( $key );
		if ( !$knownThumbUrls ) {
			/* No knownThumbUrls for this file */
			$knownThumbUrls = array();
		} else {
			if ( isset( $knownThumbUrls[$sizekey] ) ) {
				wfDebug( __METHOD__ . ': Got thumburl from local cache: ' .
					"{$knownThumbUrls[$sizekey]} \n" );

				return $knownThumbUrls[$sizekey];
			}
			/* This size is not yet known */
		}

		$metadata = null;
		$foreignUrl = $this->getThumbUrl( $name, $width, $height, $metadata, $params );

		if ( !$foreignUrl ) {
			wfDebug( __METHOD__ . " Could not find thumburl\n" );

			return false;
		}

		// We need the same filename as the remote one :)
		$fileName = rawurldecode( pathinfo( $foreignUrl, PATHINFO_BASENAME ) );
		if ( !$this->validateFilename( $fileName ) ) {
			wfDebug( __METHOD__ . " The deduced filename $fileName is not safe\n" );

			return false;
		}
		$localPath = $this->getZonePath( 'thumb' ) . "/" . $this->getHashPath( $name ) . $name;
		$localFilename = $localPath . "/" . $fileName;
		$localUrl = $this->getZoneUrl( 'thumb' ) . "/" . $this->getHashPath( $name ) .
			rawurlencode( $name ) . "/" . rawurlencode( $fileName );

		if ( $backend->fileExists( array( 'src' => $localFilename ) )
			&& isset( $metadata['timestamp'] )
		) {
			wfDebug( __METHOD__ . " Thumbnail was already downloaded before\n" );
			$modified = $backend->getFileTimestamp( array( 'src' => $localFilename ) );
			$remoteModified = strtotime( $metadata['timestamp'] );
			$current = time();
			$diff = abs( $modified - $current );
			if ( $remoteModified < $modified && $diff < $this->fileCacheExpiry ) {
				/* Use our current and already downloaded thumbnail */
				$knownThumbUrls[$sizekey] = $localUrl;
				$wgMemc->set( $key, $knownThumbUrls, $this->apiThumbCacheExpiry );

				return $localUrl;
			}
			/* There is a new Commons file, or existing thumbnail older than a month */
		}
		$thumb = self::httpGet( $foreignUrl );
		if ( !$thumb ) {
			wfDebug( __METHOD__ . " Could not download thumb\n" );

			return false;
		}

		# @todo FIXME: Delete old thumbs that aren't being used. Maintenance script?
		$backend->prepare( array( 'dir' => dirname( $localFilename ) ) );
		$params = array( 'dst' => $localFilename, 'content' => $thumb );
		if ( !$backend->quickCreate( $params )->isOK() ) {
			wfDebug( __METHOD__ . " could not write to thumb path '$localFilename'\n" );

			return $foreignUrl;
		}
		$knownThumbUrls[$sizekey] = $localUrl;
		$wgMemc->set( $key, $knownThumbUrls, $this->apiThumbCacheExpiry );
		wfDebug( __METHOD__ . " got local thumb $localUrl, saving to cache \n" );

		return $localUrl;
	}

	/**
	 * @see FileRepo::getZoneUrl()
	 * @param string $zone
	 * @param string|null $ext Optional file extension
	 * @return string
	 */
	function getZoneUrl( $zone, $ext = null ) {
		switch ( $zone ) {
			case 'public':
				return $this->url;
			case 'thumb':
				return $this->thumbUrl;
			default:
				return parent::getZoneUrl( $zone, $ext );
		}
	}

	/**
	 * Get the local directory corresponding to one of the basic zones
	 * @param string $zone
	 * @return bool|null|string
	 */
	function getZonePath( $zone ) {
		$supported = array( 'public', 'thumb' );
		if ( in_array( $zone, $supported ) ) {
			return parent::getZonePath( $zone );
		}

		return false;
	}

	/**
	 * Are we locally caching the thumbnails?
	 * @return bool
	 */
	public function canCacheThumbs() {
		return ( $this->apiThumbCacheExpiry > 0 );
	}

	/**
	 * The user agent the ForeignAPIRepo will use.
	 * @return string
	 */
	public static function getUserAgent() {
		return Http::userAgent() . " ForeignAPIRepo/" . self::VERSION;
	}

	/**
	 * Get information about the repo - overrides/extends the parent
	 * class's information.
	 * @return array
	 * @since 1.22
	 */
	function getInfo() {
		$info = parent::getInfo();
		$info['apiurl'] = $this->getApiUrl();

		$query = array(
			'format' => 'json',
			'action' => 'query',
			'meta' => 'siteinfo',
			'siprop' => 'general',
		);

		$data = $this->httpGetCached( 'SiteInfo', $query, 7200 );

		if ( $data ) {
			$siteInfo = FormatJson::decode( $data, true );
			$general = $siteInfo['query']['general'];

			$info['articlepath'] = $general['articlepath'];
			$info['server'] = $general['server'];

			if ( isset( $general['favicon'] ) ) {
				$info['favicon'] = $general['favicon'];
			}
		}

		return $info;
	}

	/**
	 * Like a Http:get request, but with custom User-Agent.
	 * @see Http:get
	 * @param string $url
	 * @param string $timeout
	 * @param array $options
	 * @return bool|string
	 */
	public static function httpGet( $url, $timeout = 'default', $options = array() ) {
		$options['timeout'] = $timeout;
		/* Http::get */
		$url = wfExpandUrl( $url, PROTO_HTTP );
		wfDebug( "ForeignAPIRepo: HTTP GET: $url\n" );
		$options['method'] = "GET";

		if ( !isset( $options['timeout'] ) ) {
			$options['timeout'] = 'default';
		}

		$req = MWHttpRequest::factory( $url, $options, __METHOD__ );
		$req->setUserAgent( ForeignAPIRepo::getUserAgent() );
		$status = $req->execute();

		if ( $status->isOK() ) {
			return $req->getContent();
		} else {
			return false;
		}
	}

	/**
	 * @return string
	 * @since 1.23
	 */
	protected static function getIIProps() {
		return join( '|', self::$imageInfoProps );
	}

	/**
	 * HTTP GET request to a mediawiki API (with caching)
	 * @param string $target Used in cache key creation, mostly
	 * @param array $query The query parameters for the API request
	 * @param int $cacheTTL Time to live for the memcached caching
	 * @return null
	 */
	public function httpGetCached( $target, $query, $cacheTTL = 3600 ) {
		if ( $this->mApiBase ) {
			$url = wfAppendQuery( $this->mApiBase, $query );
		} else {
			$url = $this->makeUrl( $query, 'api' );
		}

		if ( !isset( $this->mQueryCache[$url] ) ) {
			global $wgMemc;

			$key = $this->getLocalCacheKey( get_class( $this ), $target, md5( $url ) );
			$data = $wgMemc->get( $key );

			if ( !$data ) {
				$data = self::httpGet( $url );

				if ( !$data ) {
					return null;
				}

				$wgMemc->set( $key, $data, $cacheTTL );
			}

			if ( count( $this->mQueryCache ) > 100 ) {
				// Keep the cache from growing infinitely
				$this->mQueryCache = array();
			}

			$this->mQueryCache[$url] = $data;
		}

		return $this->mQueryCache[$url];
	}

	/**
	 * @param callable $callback
	 * @throws MWException
	 */
	function enumFiles( $callback ) {
		throw new MWException( 'enumFiles is not supported by ' . get_class( $this ) );
	}

	/**
	 * @throws MWException
	 */
	protected function assertWritableRepo() {
		throw new MWException( get_class( $this ) . ': write operations are not supported.' );
	}
}