632 lines
18 KiB
PHP
632 lines
18 KiB
PHP
<?php
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/**
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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* http://www.gnu.org/copyleft/gpl.html
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*
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* @file
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*/
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use MediaWiki\Json\FormatJson;
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use MediaWiki\Linker\LinkTarget;
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use MediaWiki\Logger\LoggerFactory;
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use MediaWiki\MainConfigNames;
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use MediaWiki\MediaWikiServices;
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use MediaWiki\Page\PageIdentity;
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use MediaWiki\Title\Title;
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use Wikimedia\FileBackend\FileBackend;
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use Wikimedia\ObjectCache\WANObjectCache;
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/**
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* A foreign repository for a remote MediaWiki accessible through api.php requests.
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*
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* @par Example config:
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* @code
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* $wgForeignFileRepos[] = [
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* 'class' => ForeignAPIRepo::class,
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* 'name' => 'shared',
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* 'apibase' => 'https://en.wikipedia.org/w/api.php',
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* 'fetchDescription' => true, // Optional
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* 'descriptionCacheExpiry' => 3600,
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* ];
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* @endcode
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*
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* @ingroup FileRepo
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*/
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class ForeignAPIRepo extends FileRepo implements IForeignRepoWithMWApi {
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/* This version string is used in the user agent for requests and will help
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* server maintainers in identify ForeignAPI usage.
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* Update the version every time you make breaking or significant changes. */
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private const VERSION = "2.1";
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/**
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* List of iiprop values for the thumbnail fetch queries.
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*/
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private const IMAGE_INFO_PROPS = [
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'url',
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'timestamp',
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];
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/** @var callable */
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protected $fileFactory = [ ForeignAPIFile::class, 'newFromTitle' ];
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/** @var int Check back with Commons after this expiry */
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protected $apiThumbCacheExpiry = 24 * 3600; // 1 day
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/** @var int Redownload thumbnail files after this expiry */
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protected $fileCacheExpiry = 30 * 24 * 3600; // 1 month
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/**
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* @var int API metadata cache time.
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* @since 1.38
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*
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* This is often the performance bottleneck for ForeignAPIRepo. For
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* each file used, we must fetch file metadata for it and every high-DPI
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* variant, in serial, during the parse. This is slow if a page has many
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* files, with RTT of the handshake often being significant. The metadata
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* rarely changes, but if a new version of the file was uploaded, it might
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* be displayed incorrectly until its metadata entry falls out of cache.
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*/
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protected $apiMetadataExpiry = 4 * 3600; // 4 hours
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/** @var array */
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protected $mFileExists = [];
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/** @var string */
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private $mApiBase;
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/**
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* @param array|null $info
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*/
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public function __construct( $info ) {
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$localFileRepo = MediaWikiServices::getInstance()->getMainConfig()
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->get( MainConfigNames::LocalFileRepo );
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parent::__construct( $info );
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// https://commons.wikimedia.org/w/api.php
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$this->mApiBase = $info['apibase'] ?? null;
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if ( isset( $info['apiThumbCacheExpiry'] ) ) {
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$this->apiThumbCacheExpiry = $info['apiThumbCacheExpiry'];
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}
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if ( isset( $info['fileCacheExpiry'] ) ) {
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$this->fileCacheExpiry = $info['fileCacheExpiry'];
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}
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if ( isset( $info['apiMetadataExpiry'] ) ) {
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$this->apiMetadataExpiry = $info['apiMetadataExpiry'];
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}
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if ( !$this->scriptDirUrl ) {
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// hack for description fetches
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$this->scriptDirUrl = dirname( $this->mApiBase );
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}
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// If we can cache thumbs we can guess sensible defaults for these
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if ( $this->canCacheThumbs() && !$this->url ) {
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$this->url = $localFileRepo['url'];
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}
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if ( $this->canCacheThumbs() && !$this->thumbUrl ) {
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$this->thumbUrl = $this->url . '/thumb';
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}
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}
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/**
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* Per docs in FileRepo, this needs to return false if we don't support versioned
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* files. Well, we don't.
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*
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* @param PageIdentity|LinkTarget|string $title
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* @param string|false $time
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* @return File|false
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*/
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public function newFile( $title, $time = false ) {
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if ( $time ) {
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return false;
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}
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return parent::newFile( $title, $time );
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}
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/**
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* @param string[] $files
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* @return array
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*/
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public function fileExistsBatch( array $files ) {
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$results = [];
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foreach ( $files as $k => $f ) {
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if ( isset( $this->mFileExists[$f] ) ) {
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$results[$k] = $this->mFileExists[$f];
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unset( $files[$k] );
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} elseif ( self::isVirtualUrl( $f ) ) {
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# @todo FIXME: We need to be able to handle virtual
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# URLs better, at least when we know they refer to the
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# same repo.
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$results[$k] = false;
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unset( $files[$k] );
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} elseif ( FileBackend::isStoragePath( $f ) ) {
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$results[$k] = false;
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unset( $files[$k] );
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wfWarn( "Got mwstore:// path '$f'." );
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}
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}
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$data = $this->fetchImageQuery( [
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'titles' => implode( '|', $files ),
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'prop' => 'imageinfo' ]
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);
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if ( isset( $data['query']['pages'] ) ) {
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# First, get results from the query. Note we only care whether the image exists,
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# not whether it has a description page.
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foreach ( $data['query']['pages'] as $p ) {
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$this->mFileExists[$p['title']] = ( $p['imagerepository'] !== '' );
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}
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# Second, copy the results to any redirects that were queried
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if ( isset( $data['query']['redirects'] ) ) {
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foreach ( $data['query']['redirects'] as $r ) {
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$this->mFileExists[$r['from']] = $this->mFileExists[$r['to']];
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}
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}
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# Third, copy the results to any non-normalized titles that were queried
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if ( isset( $data['query']['normalized'] ) ) {
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foreach ( $data['query']['normalized'] as $n ) {
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$this->mFileExists[$n['from']] = $this->mFileExists[$n['to']];
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}
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}
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# Finally, copy the results to the output
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foreach ( $files as $key => $file ) {
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$results[$key] = $this->mFileExists[$file];
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}
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}
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return $results;
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}
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/**
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* @param string $virtualUrl
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* @return array
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*/
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public function getFileProps( $virtualUrl ) {
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return [];
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}
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/**
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* Make an API query in the foreign repo, caching results
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*
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* @param array $query
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* @return array|null
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*/
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public function fetchImageQuery( $query ) {
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$languageCode = MediaWikiServices::getInstance()->getMainConfig()
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->get( MainConfigNames::LanguageCode );
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$query = array_merge( $query,
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[
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'format' => 'json',
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'action' => 'query',
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'redirects' => 'true'
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] );
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if ( !isset( $query['uselang'] ) ) { // uselang is unset or null
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$query['uselang'] = $languageCode;
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}
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$data = $this->httpGetCached( 'Metadata', $query, $this->apiMetadataExpiry );
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if ( $data ) {
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return FormatJson::decode( $data, true );
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} else {
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return null;
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}
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}
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/**
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* @param array $data
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* @return array|false
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*/
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public function getImageInfo( $data ) {
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if ( $data && isset( $data['query']['pages'] ) ) {
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foreach ( $data['query']['pages'] as $info ) {
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if ( isset( $info['imageinfo'][0] ) ) {
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$return = $info['imageinfo'][0];
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if ( isset( $info['pageid'] ) ) {
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$return['pageid'] = $info['pageid'];
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}
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return $return;
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}
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}
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}
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return false;
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}
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/**
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* @param string $hash
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* @return ForeignAPIFile[]
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*/
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public function findBySha1( $hash ) {
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$results = $this->fetchImageQuery( [
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'aisha1base36' => $hash,
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'aiprop' => ForeignAPIFile::getProps(),
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'list' => 'allimages',
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] );
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$ret = [];
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if ( isset( $results['query']['allimages'] ) ) {
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foreach ( $results['query']['allimages'] as $img ) {
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// 1.14 was broken, doesn't return name attribute
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if ( !isset( $img['name'] ) ) {
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continue;
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}
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$ret[] = new ForeignAPIFile( Title::makeTitle( NS_FILE, $img['name'] ), $this, $img );
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}
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}
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return $ret;
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}
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/**
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* @param string $name
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* @param int $width
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* @param int $height
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* @param array|null &$result Output-only parameter, guaranteed to become an array
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* @param string $otherParams
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*
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* @return string|false
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*/
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private function getThumbUrl(
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$name, $width = -1, $height = -1, &$result = null, $otherParams = ''
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) {
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$data = $this->fetchImageQuery( [
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'titles' => 'File:' . $name,
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'iiprop' => self::getIIProps(),
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'iiurlwidth' => $width,
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'iiurlheight' => $height,
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'iiurlparam' => $otherParams,
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'prop' => 'imageinfo' ] );
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$info = $this->getImageInfo( $data );
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if ( $data && $info && isset( $info['thumburl'] ) ) {
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wfDebug( __METHOD__ . " got remote thumb " . $info['thumburl'] );
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$result = $info;
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return $info['thumburl'];
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} else {
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return false;
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}
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}
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/**
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* @param string $name
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* @param int $width
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* @param int $height
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* @param string $otherParams
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* @param string|null $lang Language code for language of error
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* @return MediaTransformError|false
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* @since 1.22
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*/
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public function getThumbError(
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$name, $width = -1, $height = -1, $otherParams = '', $lang = null
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) {
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$data = $this->fetchImageQuery( [
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'titles' => 'File:' . $name,
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'iiprop' => self::getIIProps(),
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'iiurlwidth' => $width,
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'iiurlheight' => $height,
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'iiurlparam' => $otherParams,
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'prop' => 'imageinfo',
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'uselang' => $lang,
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] );
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$info = $this->getImageInfo( $data );
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if ( $data && $info && isset( $info['thumberror'] ) ) {
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wfDebug( __METHOD__ . " got remote thumb error " . $info['thumberror'] );
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return new MediaTransformError(
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'thumbnail_error_remote',
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$width,
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$height,
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$this->getDisplayName(),
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$info['thumberror'] // already parsed message from foreign repo
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);
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} else {
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return false;
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}
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}
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/**
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* Return the imageurl from cache if possible
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*
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* If the url has been requested today, get it from cache
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* Otherwise retrieve remote thumb url, check for local file.
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*
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* @param string $name Is a dbkey form of a title
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* @param int $width
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* @param int $height
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* @param string $params Other rendering parameters (page number, etc)
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* from handler's makeParamString.
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* @return string|false
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*/
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public function getThumbUrlFromCache( $name, $width, $height, $params = "" ) {
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// We can't check the local cache using FileRepo functions because
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// we override fileExistsBatch(). We have to use the FileBackend directly.
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$backend = $this->getBackend(); // convenience
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if ( !$this->canCacheThumbs() ) {
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$result = null; // can't pass "null" by reference, but it's ok as default value
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return $this->getThumbUrl( $name, $width, $height, $result, $params );
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}
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$key = $this->getLocalCacheKey( 'file-thumb-url', sha1( $name ) );
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$sizekey = "$width:$height:$params";
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/* Get the array of urls that we already know */
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$knownThumbUrls = $this->wanCache->get( $key );
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if ( !$knownThumbUrls ) {
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/* No knownThumbUrls for this file */
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$knownThumbUrls = [];
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} elseif ( isset( $knownThumbUrls[$sizekey] ) ) {
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wfDebug( __METHOD__ . ': Got thumburl from local cache: ' .
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"{$knownThumbUrls[$sizekey]}" );
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return $knownThumbUrls[$sizekey];
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}
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$metadata = null;
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$foreignUrl = $this->getThumbUrl( $name, $width, $height, $metadata, $params );
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if ( !$foreignUrl ) {
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wfDebug( __METHOD__ . " Could not find thumburl" );
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return false;
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}
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// We need the same filename as the remote one :)
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$fileName = rawurldecode( pathinfo( $foreignUrl, PATHINFO_BASENAME ) );
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if ( !$this->validateFilename( $fileName ) ) {
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wfDebug( __METHOD__ . " The deduced filename $fileName is not safe" );
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return false;
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}
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$localPath = $this->getZonePath( 'thumb' ) . "/" . $this->getHashPath( $name ) . $name;
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$localFilename = $localPath . "/" . $fileName;
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$localUrl = $this->getZoneUrl( 'thumb' ) . "/" . $this->getHashPath( $name ) .
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rawurlencode( $name ) . "/" . rawurlencode( $fileName );
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if ( $backend->fileExists( [ 'src' => $localFilename ] )
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&& isset( $metadata['timestamp'] )
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) {
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wfDebug( __METHOD__ . " Thumbnail was already downloaded before" );
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$modified = (int)wfTimestamp( TS_UNIX, $backend->getFileTimestamp( [ 'src' => $localFilename ] ) );
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$remoteModified = (int)wfTimestamp( TS_UNIX, $metadata['timestamp'] );
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$current = (int)wfTimestamp( TS_UNIX );
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$diff = abs( $modified - $current );
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if ( $remoteModified < $modified && $diff < $this->fileCacheExpiry ) {
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/* Use our current and already downloaded thumbnail */
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$knownThumbUrls[$sizekey] = $localUrl;
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$this->wanCache->set( $key, $knownThumbUrls, $this->apiThumbCacheExpiry );
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return $localUrl;
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}
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/* There is a new Commons file, or existing thumbnail older than a month */
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}
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$thumb = self::httpGet( $foreignUrl, 'default', [], $mtime );
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if ( !$thumb ) {
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wfDebug( __METHOD__ . " Could not download thumb" );
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return false;
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}
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# @todo FIXME: Delete old thumbs that aren't being used. Maintenance script?
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$backend->prepare( [ 'dir' => dirname( $localFilename ) ] );
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$params = [ 'dst' => $localFilename, 'content' => $thumb ];
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if ( !$backend->quickCreate( $params )->isOK() ) {
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wfDebug( __METHOD__ . " could not write to thumb path '$localFilename'" );
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return $foreignUrl;
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}
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$knownThumbUrls[$sizekey] = $localUrl;
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$ttl = $mtime
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? $this->wanCache->adaptiveTTL( $mtime, $this->apiThumbCacheExpiry )
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: $this->apiThumbCacheExpiry;
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$this->wanCache->set( $key, $knownThumbUrls, $ttl );
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wfDebug( __METHOD__ . " got local thumb $localUrl, saving to cache" );
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return $localUrl;
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}
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/**
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* @see FileRepo::getZoneUrl()
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* @param string $zone
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* @param string|null $ext Optional file extension
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* @return string
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*/
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public function getZoneUrl( $zone, $ext = null ) {
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switch ( $zone ) {
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case 'public':
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return $this->url;
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case 'thumb':
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return $this->thumbUrl;
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default:
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return parent::getZoneUrl( $zone, $ext );
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}
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}
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/**
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* Get the local directory corresponding to one of the basic zones
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* @param string $zone
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* @return null|string|false
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*/
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public function getZonePath( $zone ) {
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$supported = [ 'public', 'thumb' ];
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if ( in_array( $zone, $supported ) ) {
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return parent::getZonePath( $zone );
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}
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return false;
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}
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/**
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* Are we locally caching the thumbnails?
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* @return bool
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*/
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public function canCacheThumbs() {
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return ( $this->apiThumbCacheExpiry > 0 );
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}
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/**
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* The user agent the ForeignAPIRepo will use.
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* @return string
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*/
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public static function getUserAgent() {
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return MediaWikiServices::getInstance()->getHttpRequestFactory()->getUserAgent() .
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" ForeignAPIRepo/" . self::VERSION;
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}
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/**
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* Get information about the repo - overrides/extends the parent
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* class's information.
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* @return array
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* @since 1.22
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*/
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public function getInfo() {
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$info = parent::getInfo();
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$info['apiurl'] = $this->mApiBase;
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$query = [
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'format' => 'json',
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'action' => 'query',
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'meta' => 'siteinfo',
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'siprop' => 'general',
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];
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$data = $this->httpGetCached( 'SiteInfo', $query, 7200 );
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if ( $data ) {
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$siteInfo = FormatJson::decode( $data, true );
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|
$general = $siteInfo['query']['general'];
|
|
|
|
$info['articlepath'] = $general['articlepath'];
|
|
$info['server'] = $general['server'];
|
|
if ( !isset( $info['favicon'] ) && isset( $general['favicon'] ) ) {
|
|
$info['favicon'] = $general['favicon'];
|
|
}
|
|
}
|
|
|
|
return $info;
|
|
}
|
|
|
|
/**
|
|
* @param string $url
|
|
* @param string $timeout
|
|
* @param array $options
|
|
* @param int|false &$mtime Resulting Last-Modified UNIX timestamp if received
|
|
* @return string|false
|
|
*/
|
|
public static function httpGet(
|
|
$url, $timeout = 'default', $options = [], &$mtime = false
|
|
) {
|
|
$options['timeout'] = $timeout;
|
|
$url = MediaWikiServices::getInstance()->getUrlUtils()
|
|
->expand( $url, PROTO_HTTP );
|
|
wfDebug( "ForeignAPIRepo: HTTP GET: $url" );
|
|
if ( !$url ) {
|
|
return false;
|
|
}
|
|
$options['method'] = "GET";
|
|
|
|
if ( !isset( $options['timeout'] ) ) {
|
|
$options['timeout'] = 'default';
|
|
}
|
|
|
|
$options['userAgent'] = self::getUserAgent();
|
|
|
|
$req = MediaWikiServices::getInstance()->getHttpRequestFactory()
|
|
->create( $url, $options, __METHOD__ );
|
|
$status = $req->execute();
|
|
|
|
if ( $status->isOK() ) {
|
|
$lmod = $req->getResponseHeader( 'Last-Modified' );
|
|
$mtime = $lmod ? (int)wfTimestamp( TS_UNIX, $lmod ) : false;
|
|
|
|
return $req->getContent();
|
|
} else {
|
|
$logger = LoggerFactory::getInstance( 'http' );
|
|
$logger->warning(
|
|
$status->getWikiText( false, false, 'en' ),
|
|
[ 'caller' => 'ForeignAPIRepo::httpGet' ]
|
|
);
|
|
|
|
return false;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @return string
|
|
* @since 1.23
|
|
*/
|
|
protected static function getIIProps() {
|
|
return implode( '|', self::IMAGE_INFO_PROPS );
|
|
}
|
|
|
|
/**
|
|
* HTTP GET request to a mediawiki API (with caching)
|
|
* @param string $attribute 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 string|null
|
|
*/
|
|
public function httpGetCached( $attribute, $query, $cacheTTL = 3600 ) {
|
|
if ( $this->mApiBase ) {
|
|
$url = wfAppendQuery( $this->mApiBase, $query );
|
|
} else {
|
|
$url = $this->makeUrl( $query, 'api' );
|
|
}
|
|
|
|
return $this->wanCache->getWithSetCallback(
|
|
// Allow reusing the same cached data across wikis (T285271).
|
|
// This does not use getSharedCacheKey() because caching here
|
|
// is transparent to client wikis (which are not expected to issue purges).
|
|
$this->wanCache->makeGlobalKey( "filerepo-$attribute", sha1( $url ) ),
|
|
$cacheTTL,
|
|
function ( $curValue, &$ttl ) use ( $url ) {
|
|
$html = self::httpGet( $url, 'default', [], $mtime );
|
|
// FIXME: This should use the mtime from the api response body
|
|
// not the mtime from the last-modified header which usually is not set.
|
|
if ( $html !== false ) {
|
|
$ttl = $mtime ? $this->wanCache->adaptiveTTL( $mtime, $ttl ) : $ttl;
|
|
} else {
|
|
$ttl = $this->wanCache->adaptiveTTL( $mtime, $ttl );
|
|
$html = null; // caches negatives
|
|
}
|
|
|
|
return $html;
|
|
},
|
|
[ 'pcGroup' => 'http-get:3', 'pcTTL' => WANObjectCache::TTL_PROC_LONG ]
|
|
);
|
|
}
|
|
|
|
/**
|
|
* @param callable $callback
|
|
* @return never
|
|
*/
|
|
public function enumFiles( $callback ) {
|
|
throw new RuntimeException( 'enumFiles is not supported by ' . static::class );
|
|
}
|
|
|
|
/**
|
|
* @return never
|
|
*/
|
|
protected function assertWritableRepo() {
|
|
throw new LogicException( static::class . ': write operations are not supported.' );
|
|
}
|
|
}
|