includes/filerepo/ForeignAPIRepo.php

   1 <?php
   2
   3 /**
   4  * A foreign repository with a remote MediaWiki with an API thingy
   5  * Very hacky and inefficient
   6  * do not use except for testing :D
   7  *
   8  * Example config:
   9  *
  10  * $wgForeignFileRepos[] = array(
  11  *   'class'                  => 'ForeignAPIRepo',
  12  *   'name'                   => 'shared',
  13  *   'apibase'                => 'http://en.wikipedia.org/w/api.php',
  14  *   'fetchDescription'       => true, // Optional
  15  *   'descriptionCacheExpiry' => 3600,
  16  * );
  17  *
  18  * @ingroup FileRepo
  19  */
  20 class ForeignAPIRepo extends FileRepo {
  21         var $fileFactory = array( 'ForeignAPIFile', 'newFromTitle' );
  22         var $apiThumbCacheExpiry = 0;
  23         protected $mQueryCache = array();
  24         protected $mFileExists = array();
  25
  26         function __construct( $info ) {
  27                 parent::__construct( $info );
  28                 $this->mApiBase = $info['apibase']; // http://commons.wikimedia.org/w/api.php
  29                 if( !$this->scriptDirUrl ) {
  30                         // hack for description fetches
  31                         $this->scriptDirUrl = dirname( $this->mApiBase );
  32                 }
  33         }
  34
  35         /**
  36          * Per docs in FileRepo, this needs to return false if we don't support versioned
  37          * files. Well, we don't.
  38          */
  39         function newFile( $title, $time = false ) {
  40                 if ( $time ) {
  41                         return false;
  42                 }
  43                 return parent::newFile( $title, $time );
  44         }
  45
  46 /**
  47  * No-ops
  48  */
  49         function storeBatch( $triplets, $flags = 0 ) {
  50                 return false;
  51         }
  52         function storeTemp( $originalName, $srcPath ) {
  53                 return false;
  54         }
  55         function publishBatch( $triplets, $flags = 0 ) {
  56                 return false;
  57         }
  58         function deleteBatch( $sourceDestPairs ) {
  59                 return false;
  60         }
  61
  62
  63         function fileExistsBatch( $files, $flags = 0 ) {
  64                 $results = array();
  65                 foreach ( $files as $k => $f ) {
  66                         if ( isset( $this->mFileExists[$k] ) ) {
  67                                 $results[$k] = true;
  68                                 unset( $files[$k] );
  69                         } elseif( self::isVirtualUrl( $f ) ) {
  70                                 # TODO! FIXME! We need to be able to handle virtual
  71                                 # URLs better, at least when we know they refer to the
  72                                 # same repo.
  73                                 $results[$k] = false;
  74                                 unset( $files[$k] );
  75                         }
  76                 }
  77
  78                 $results = $this->fetchImageQuery( array( 'titles' => implode( $files, '|' ),
  79                                                                                         'prop' => 'imageinfo' ) );
  80                 if( isset( $data['query']['pages'] ) ) {
  81                         $i = 0;
  82                         foreach( $files as $key => $file ) {
  83                                 $results[$key] = $this->mFileExists[$key] = !isset( $data['query']['pages'][$i]['missing'] );
  84                                 $i++;
  85                         }
  86                 }
  87         }
  88         function getFileProps( $virtualUrl ) {
  89                 return false;
  90         }
  91
  92         protected function queryImage( $query ) {
  93                 $data = $this->fetchImageQuery( $query );
  94
  95                 if( isset( $data['query']['pages'] ) ) {
  96                         foreach( $data['query']['pages'] as $pageid => $info ) {
  97                                 if( isset( $info['imageinfo'][0] ) ) {
  98                                         return $info['imageinfo'][0];
  99                                 }
 100                         }
 101                 }
 102                 return false;
 103         }
 104
 105         protected function fetchImageQuery( $query ) {
 106                 global $wgMemc;
 107
 108                 $url = $this->mApiBase .
 109                         '?' .
 110                         wfArrayToCgi(
 111                                 array_merge( $query,
 112                                         array(
 113                                                 'format' => 'json',
 114                                                 'action' => 'query' ) ) );
 115
 116                 if( !isset( $this->mQueryCache[$url] ) ) {
 117                         $key = $this->getLocalCacheKey( 'ForeignAPIRepo', 'Metadata', md5( $url ) );
 118                         $data = $wgMemc->get( $key );
 119                         if( !$data ) {
 120                                 $data = Http::get( $url );
 121                                 if ( !$data ) {
 122                                         return null;
 123                                 }
 124                                 $wgMemc->set( $key, $data, 3600 );
 125                         }
 126
 127                         if( count( $this->mQueryCache ) > 100 ) {
 128                                 // Keep the cache from growing infinitely
 129                                 $this->mQueryCache = array();
 130                         }
 131                         $this->mQueryCache[$url] = $data;
 132                 }
 133                 return FormatJson::decode( $this->mQueryCache[$url], true );
 134         }
 135
 136         function getImageInfo( $title, $time = false ) {
 137                 return $this->queryImage( array(
 138                         'titles' => 'Image:' . $title->getText(),
 139                         'iiprop' => 'timestamp|user|comment|url|size|sha1|metadata|mime',
 140                         'prop' => 'imageinfo' ) );
 141         }
 142
 143         function findBySha1( $hash ) {
 144                 $results = $this->fetchImageQuery( array(
 145                                                                                 'aisha1base36' => $hash,
 146                                                                                 'aiprop'       => 'timestamp|user|comment|url|size|sha1|metadata|mime',
 147                                                                                 'list'         => 'allimages', ) );
 148                 $ret = array();
 149                 if ( isset( $results['query']['allimages'] ) ) {
 150                         foreach ( $results['query']['allimages'] as $img ) {
 151                                 $ret[] = new ForeignAPIFile( Title::makeTitle( NS_FILE, $img['name'] ), $this, $img );
 152                         }
 153                 }
 154                 return $ret;
 155         }
 156
 157         function getThumbUrl( $name, $width=-1, $height=-1 ) {
 158                 $info = $this->queryImage( array(
 159                         'titles' => 'Image:' . $name,
 160                         'iiprop' => 'url',
 161                         'iiurlwidth' => $width,
 162                         'iiurlheight' => $height,
 163                         'prop' => 'imageinfo' ) );
 164                 if( $info ) {
 165                         wfDebug( __METHOD__ . " got remote thumb " . $info['thumburl'] . "\n" );
 166                         return $info['thumburl'];
 167                 } else {
 168                         return false;
 169                 }
 170         }
 171
 172         function getThumbUrlFromCache( $name, $width, $height ) {
 173                 global $wgMemc, $wgUploadPath, $wgServer, $wgUploadDirectory;
 174
 175                 if ( !$this->canCacheThumbs() ) {
 176                         return $this->getThumbUrl( $name, $width, $height );
 177                 }
 178
 179                 $key = $this->getLocalCacheKey( 'ForeignAPIRepo', 'ThumbUrl', $name );
 180                 if ( $thumbUrl = $wgMemc->get($key) ) {
 181                         wfDebug("Got thumb from local cache. $thumbUrl \n");
 182                         return $thumbUrl;
 183                 }
 184                 else {
 185                         $foreignUrl = $this->getThumbUrl( $name, $width, $height );
 186
 187                         // We need the same filename as the remote one :)
 188                         $fileName = ltrim( substr( $foreignUrl, strrpos( $foreignUrl, '/' ) ), '/' );
 189                         $path = 'thumb/' . $this->getHashPath( $name ) . $name . "/";
 190                         if ( !is_dir($wgUploadDirectory . '/' . $path) ) {
 191                                 wfMkdirParents($wgUploadDirectory . '/' . $path);
 192                         }
 193                         $localUrl =  $wgServer . $wgUploadPath . '/' . $path . $fileName;
 194                         $thumb = Http::get( $foreignUrl );
 195                         # FIXME: Delete old thumbs that aren't being used. Maintenance script?
 196                         if( !file_put_contents($wgUploadDirectory . '/' . $path . $fileName, $thumb ) ) {
 197                                 wfDebug( __METHOD__ . " could not write to thumb path\n" );
 198                                 return $foreignUrl;
 199                         }
 200                         $wgMemc->set( $key, $localUrl, $this->apiThumbCacheExpiry );
 201                         wfDebug( __METHOD__ . " got local thumb $localUrl, saving to cache \n" );
 202                         return $localUrl;
 203                 }
 204         }
 205
 206         /**
 207          * Are we locally caching the thumbnails?
 208          * @return bool
 209          */
 210         public function canCacheThumbs() {
 211                 return ( $this->apiThumbCacheExpiry > 0 );
 212         }
 213 }