3 * Foreign repository accessible through api.php requests.
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
18 * http://www.gnu.org/copyleft/gpl.html
25 * A foreign repository with a remote MediaWiki with an API thingy
29 * $wgForeignFileRepos[] = array(
30 * 'class' => 'ForeignAPIRepo',
32 * 'apibase' => 'http://en.wikipedia.org/w/api.php',
33 * 'fetchDescription' => true, // Optional
34 * 'descriptionCacheExpiry' => 3600,
39 class ForeignAPIRepo
extends FileRepo
{
40 /* This version string is used in the user agent for requests and will help
41 * server maintainers in identify ForeignAPI usage.
42 * Update the version every time you make breaking or significant changes. */
43 const VERSION
= "2.1";
46 * List of iiprop values for the thumbnail fetch queries.
49 protected static $imageInfoProps = array(
55 protected $fileFactory = array( 'ForeignAPIFile', 'newFromTitle' );
56 /** @var int Check back with Commons after a day (24*60*60) */
57 protected $apiThumbCacheExpiry = 86400;
59 /** @var int Redownload thumbnail files after a month (86400*30) */
60 protected $fileCacheExpiry = 2592000;
63 protected $mFileExists = array();
66 private $mQueryCache = array();
69 * @param array|null $info
71 function __construct( $info ) {
72 global $wgLocalFileRepo;
73 parent
::__construct( $info );
75 // http://commons.wikimedia.org/w/api.php
76 $this->mApiBase
= isset( $info['apibase'] ) ?
$info['apibase'] : null;
78 if ( isset( $info['apiThumbCacheExpiry'] ) ) {
79 $this->apiThumbCacheExpiry
= $info['apiThumbCacheExpiry'];
81 if ( isset( $info['fileCacheExpiry'] ) ) {
82 $this->fileCacheExpiry
= $info['fileCacheExpiry'];
84 if ( !$this->scriptDirUrl
) {
85 // hack for description fetches
86 $this->scriptDirUrl
= dirname( $this->mApiBase
);
88 // If we can cache thumbs we can guess sane defaults for these
89 if ( $this->canCacheThumbs() && !$this->url
) {
90 $this->url
= $wgLocalFileRepo['url'];
92 if ( $this->canCacheThumbs() && !$this->thumbUrl
) {
93 $this->thumbUrl
= $this->url
. '/thumb';
101 function getApiUrl() {
102 return $this->mApiBase
;
106 * Per docs in FileRepo, this needs to return false if we don't support versioned
107 * files. Well, we don't.
109 * @param Title $title
110 * @param string|bool $time
113 function newFile( $title, $time = false ) {
118 return parent
::newFile( $title, $time );
122 * @param array $files
125 function fileExistsBatch( array $files ) {
127 foreach ( $files as $k => $f ) {
128 if ( isset( $this->mFileExists
[$f] ) ) {
129 $results[$k] = $this->mFileExists
[$f];
131 } elseif ( self
::isVirtualUrl( $f ) ) {
132 # @todo FIXME: We need to be able to handle virtual
133 # URLs better, at least when we know they refer to the
135 $results[$k] = false;
137 } elseif ( FileBackend
::isStoragePath( $f ) ) {
138 $results[$k] = false;
140 wfWarn( "Got mwstore:// path '$f'." );
144 $data = $this->fetchImageQuery( array(
145 'titles' => implode( $files, '|' ),
146 'prop' => 'imageinfo' )
149 if ( isset( $data['query']['pages'] ) ) {
150 # First, get results from the query. Note we only care whether the image exists,
151 # not whether it has a description page.
152 foreach ( $data['query']['pages'] as $p ) {
153 $this->mFileExists
[$p['title']] = ( $p['imagerepository'] !== '' );
155 # Second, copy the results to any redirects that were queried
156 if ( isset( $data['query']['redirects'] ) ) {
157 foreach ( $data['query']['redirects'] as $r ) {
158 $this->mFileExists
[$r['from']] = $this->mFileExists
[$r['to']];
161 # Third, copy the results to any non-normalized titles that were queried
162 if ( isset( $data['query']['normalized'] ) ) {
163 foreach ( $data['query']['normalized'] as $n ) {
164 $this->mFileExists
[$n['from']] = $this->mFileExists
[$n['to']];
167 # Finally, copy the results to the output
168 foreach ( $files as $key => $file ) {
169 $results[$key] = $this->mFileExists
[$file];
177 * @param string $virtualUrl
180 function getFileProps( $virtualUrl ) {
185 * @param array $query
188 function fetchImageQuery( $query ) {
189 global $wgLanguageCode;
191 $query = array_merge( $query,
195 'redirects' => 'true'
198 if ( !isset( $query['uselang'] ) ) { // uselang is unset or null
199 $query['uselang'] = $wgLanguageCode;
202 $data = $this->httpGetCached( 'Metadata', $query );
205 return FormatJson
::decode( $data, true );
215 function getImageInfo( $data ) {
216 if ( $data && isset( $data['query']['pages'] ) ) {
217 foreach ( $data['query']['pages'] as $info ) {
218 if ( isset( $info['imageinfo'][0] ) ) {
219 return $info['imageinfo'][0];
228 * @param string $hash
231 function findBySha1( $hash ) {
232 $results = $this->fetchImageQuery( array(
233 'aisha1base36' => $hash,
234 'aiprop' => ForeignAPIFile
::getProps(),
235 'list' => 'allimages',
238 if ( isset( $results['query']['allimages'] ) ) {
239 foreach ( $results['query']['allimages'] as $img ) {
240 // 1.14 was broken, doesn't return name attribute
241 if ( !isset( $img['name'] ) ) {
244 $ret[] = new ForeignAPIFile( Title
::makeTitle( NS_FILE
, $img['name'] ), $this, $img );
252 * @param string $name
255 * @param array $result Out parameter that will be changed by the function.
256 * @param string $otherParams
260 function getThumbUrl( $name, $width = -1, $height = -1, &$result = null, $otherParams = '' ) {
261 $data = $this->fetchImageQuery( array(
262 'titles' => 'File:' . $name,
263 'iiprop' => self
::getIIProps(),
264 'iiurlwidth' => $width,
265 'iiurlheight' => $height,
266 'iiurlparam' => $otherParams,
267 'prop' => 'imageinfo' ) );
268 $info = $this->getImageInfo( $data );
270 if ( $data && $info && isset( $info['thumburl'] ) ) {
271 wfDebug( __METHOD__
. " got remote thumb " . $info['thumburl'] . "\n" );
274 return $info['thumburl'];
281 * @param string $name
284 * @param string $otherParams
285 * @param string $lang Language code for language of error
286 * @return bool|MediaTransformError
289 function getThumbError( $name, $width = -1, $height = -1, $otherParams = '', $lang = null ) {
290 $data = $this->fetchImageQuery( array(
291 'titles' => 'File:' . $name,
292 'iiprop' => self
::getIIProps(),
293 'iiurlwidth' => $width,
294 'iiurlheight' => $height,
295 'iiurlparam' => $otherParams,
296 'prop' => 'imageinfo',
299 $info = $this->getImageInfo( $data );
301 if ( $data && $info && isset( $info['thumberror'] ) ) {
302 wfDebug( __METHOD__
. " got remote thumb error " . $info['thumberror'] . "\n" );
304 return new MediaTransformError(
305 'thumbnail_error_remote',
308 $this->getDisplayName(),
309 $info['thumberror'] // already parsed message from foreign repo
317 * Return the imageurl from cache if possible
319 * If the url has been requested today, get it from cache
320 * Otherwise retrieve remote thumb url, check for local file.
322 * @param string $name Is a dbkey form of a title
325 * @param string $params Other rendering parameters (page number, etc)
326 * from handler's makeParamString.
327 * @return bool|string
329 function getThumbUrlFromCache( $name, $width, $height, $params = "" ) {
331 // We can't check the local cache using FileRepo functions because
332 // we override fileExistsBatch(). We have to use the FileBackend directly.
333 $backend = $this->getBackend(); // convenience
335 if ( !$this->canCacheThumbs() ) {
336 $result = null; // can't pass "null" by reference, but it's ok as default value
337 return $this->getThumbUrl( $name, $width, $height, $result, $params );
339 $key = $this->getLocalCacheKey( 'ForeignAPIRepo', 'ThumbUrl', $name );
340 $sizekey = "$width:$height:$params";
342 /* Get the array of urls that we already know */
343 $knownThumbUrls = $wgMemc->get( $key );
344 if ( !$knownThumbUrls ) {
345 /* No knownThumbUrls for this file */
346 $knownThumbUrls = array();
348 if ( isset( $knownThumbUrls[$sizekey] ) ) {
349 wfDebug( __METHOD__
. ': Got thumburl from local cache: ' .
350 "{$knownThumbUrls[$sizekey]} \n" );
352 return $knownThumbUrls[$sizekey];
354 /* This size is not yet known */
358 $foreignUrl = $this->getThumbUrl( $name, $width, $height, $metadata, $params );
360 if ( !$foreignUrl ) {
361 wfDebug( __METHOD__
. " Could not find thumburl\n" );
366 // We need the same filename as the remote one :)
367 $fileName = rawurldecode( pathinfo( $foreignUrl, PATHINFO_BASENAME
) );
368 if ( !$this->validateFilename( $fileName ) ) {
369 wfDebug( __METHOD__
. " The deduced filename $fileName is not safe\n" );
373 $localPath = $this->getZonePath( 'thumb' ) . "/" . $this->getHashPath( $name ) . $name;
374 $localFilename = $localPath . "/" . $fileName;
375 $localUrl = $this->getZoneUrl( 'thumb' ) . "/" . $this->getHashPath( $name ) .
376 rawurlencode( $name ) . "/" . rawurlencode( $fileName );
378 if ( $backend->fileExists( array( 'src' => $localFilename ) )
379 && isset( $metadata['timestamp'] )
381 wfDebug( __METHOD__
. " Thumbnail was already downloaded before\n" );
382 $modified = $backend->getFileTimestamp( array( 'src' => $localFilename ) );
383 $remoteModified = strtotime( $metadata['timestamp'] );
385 $diff = abs( $modified - $current );
386 if ( $remoteModified < $modified && $diff < $this->fileCacheExpiry
) {
387 /* Use our current and already downloaded thumbnail */
388 $knownThumbUrls[$sizekey] = $localUrl;
389 $wgMemc->set( $key, $knownThumbUrls, $this->apiThumbCacheExpiry
);
393 /* There is a new Commons file, or existing thumbnail older than a month */
395 $thumb = self
::httpGet( $foreignUrl );
397 wfDebug( __METHOD__
. " Could not download thumb\n" );
402 # @todo FIXME: Delete old thumbs that aren't being used. Maintenance script?
403 $backend->prepare( array( 'dir' => dirname( $localFilename ) ) );
404 $params = array( 'dst' => $localFilename, 'content' => $thumb );
405 if ( !$backend->quickCreate( $params )->isOK() ) {
406 wfDebug( __METHOD__
. " could not write to thumb path '$localFilename'\n" );
410 $knownThumbUrls[$sizekey] = $localUrl;
411 $wgMemc->set( $key, $knownThumbUrls, $this->apiThumbCacheExpiry
);
412 wfDebug( __METHOD__
. " got local thumb $localUrl, saving to cache \n" );
418 * @see FileRepo::getZoneUrl()
419 * @param string $zone
420 * @param string|null $ext Optional file extension
423 function getZoneUrl( $zone, $ext = null ) {
428 return $this->thumbUrl
;
430 return parent
::getZoneUrl( $zone, $ext );
435 * Get the local directory corresponding to one of the basic zones
436 * @param string $zone
437 * @return bool|null|string
439 function getZonePath( $zone ) {
440 $supported = array( 'public', 'thumb' );
441 if ( in_array( $zone, $supported ) ) {
442 return parent
::getZonePath( $zone );
449 * Are we locally caching the thumbnails?
452 public function canCacheThumbs() {
453 return ( $this->apiThumbCacheExpiry
> 0 );
457 * The user agent the ForeignAPIRepo will use.
460 public static function getUserAgent() {
461 return Http
::userAgent() . " ForeignAPIRepo/" . self
::VERSION
;
465 * Get information about the repo - overrides/extends the parent
466 * class's information.
471 $info = parent
::getInfo();
472 $info['apiurl'] = $this->getApiUrl();
477 'meta' => 'siteinfo',
478 'siprop' => 'general',
481 $data = $this->httpGetCached( 'SiteInfo', $query, 7200 );
484 $siteInfo = FormatJson
::decode( $data, true );
485 $general = $siteInfo['query']['general'];
487 $info['articlepath'] = $general['articlepath'];
488 $info['server'] = $general['server'];
490 if ( isset( $general['favicon'] ) ) {
491 $info['favicon'] = $general['favicon'];
499 * Like a Http:get request, but with custom User-Agent.
502 * @param string $timeout
503 * @param array $options
504 * @return bool|string
506 public static function httpGet( $url, $timeout = 'default', $options = array() ) {
507 $options['timeout'] = $timeout;
509 $url = wfExpandUrl( $url, PROTO_HTTP
);
510 wfDebug( "ForeignAPIRepo: HTTP GET: $url\n" );
511 $options['method'] = "GET";
513 if ( !isset( $options['timeout'] ) ) {
514 $options['timeout'] = 'default';
517 $req = MWHttpRequest
::factory( $url, $options );
518 $req->setUserAgent( ForeignAPIRepo
::getUserAgent() );
519 $status = $req->execute();
521 if ( $status->isOK() ) {
522 return $req->getContent();
532 protected static function getIIProps() {
533 return join( '|', self
::$imageInfoProps );
537 * HTTP GET request to a mediawiki API (with caching)
538 * @param string $target Used in cache key creation, mostly
539 * @param array $query The query parameters for the API request
540 * @param int $cacheTTL Time to live for the memcached caching
543 public function httpGetCached( $target, $query, $cacheTTL = 3600 ) {
544 if ( $this->mApiBase
) {
545 $url = wfAppendQuery( $this->mApiBase
, $query );
547 $url = $this->makeUrl( $query, 'api' );
550 if ( !isset( $this->mQueryCache
[$url] ) ) {
553 $key = $this->getLocalCacheKey( get_class( $this ), $target, md5( $url ) );
554 $data = $wgMemc->get( $key );
557 $data = self
::httpGet( $url );
563 $wgMemc->set( $key, $data, $cacheTTL );
566 if ( count( $this->mQueryCache
) > 100 ) {
567 // Keep the cache from growing infinitely
568 $this->mQueryCache
= array();
571 $this->mQueryCache
[$url] = $data;
574 return $this->mQueryCache
[$url];
578 * @param array|string $callback
579 * @throws MWException
581 function enumFiles( $callback ) {
582 throw new MWException( 'enumFiles is not supported by ' . get_class( $this ) );
586 * @throws MWException
588 protected function assertWritableRepo() {
589 throw new MWException( get_class( $this ) . ': write operations are not supported.' );