includes/filerepo/FileRepo.php

   1 <?php
   2 /**
   3  * Base code for file repositories.
   4  *
   5  * @file
   6  * @ingroup FileRepo
   7  */
   8
   9 /**
  10  * Base class for file repositories.
  11  * Do not instantiate, use a derived class.
  12  *
  13  * @ingroup FileRepo
  14  */
  15 abstract class FileRepo {
  16         const FILES_ONLY = 1;
  17         const DELETE_SOURCE = 1;
  18         const OVERWRITE = 2;
  19         const OVERWRITE_SAME = 4;
  20         const SKIP_VALIDATION = 8;
  21
  22         var $thumbScriptUrl, $transformVia404;
  23         var $descBaseUrl, $scriptDirUrl, $scriptExtension, $articleUrl;
  24         var $fetchDescription, $initialCapital;
  25         var $pathDisclosureProtection = 'paranoid';
  26         var $descriptionCacheExpiry, $hashLevels, $url, $thumbUrl;
  27
  28         /**
  29          * Factory functions for creating new files
  30          * Override these in the base class
  31          */
  32         var $fileFactory = false, $oldFileFactory = false;
  33         var $fileFactoryKey = false, $oldFileFactoryKey = false;
  34
  35         function __construct( $info ) {
  36                 // Required settings
  37                 $this->name = $info['name'];
  38
  39                 // Optional settings
  40                 $this->initialCapital = MWNamespace::isCapitalized( NS_FILE );
  41                 foreach ( array( 'descBaseUrl', 'scriptDirUrl', 'articleUrl', 'fetchDescription',
  42                         'thumbScriptUrl', 'initialCapital', 'pathDisclosureProtection',
  43                         'descriptionCacheExpiry', 'hashLevels', 'url', 'thumbUrl', 'scriptExtension' )
  44                         as $var )
  45                 {
  46                         if ( isset( $info[$var] ) ) {
  47                                 $this->$var = $info[$var];
  48                         }
  49                 }
  50                 $this->transformVia404 = !empty( $info['transformVia404'] );
  51         }
  52
  53         /**
  54          * Determine if a string is an mwrepo:// URL
  55          *
  56          * @param $url string
  57          *
  58          * @return bool
  59          */
  60         static function isVirtualUrl( $url ) {
  61                 return substr( $url, 0, 9 ) == 'mwrepo://';
  62         }
  63
  64         /**
  65          * Create a new File object from the local repository
  66          *
  67          * @param $title Mixed: Title object or string
  68          * @param $time Mixed: Time at which the image was uploaded.
  69          *              If this is specified, the returned object will be an
  70          *              instance of the repository's old file class instead of a
  71          *              current file. Repositories not supporting version control
  72          *              should return false if this parameter is set.
  73          *
  74          * @return File
  75          */
  76         function newFile( $title, $time = false ) {
  77                 if ( !( $title instanceof Title ) ) {
  78                         $title = Title::makeTitleSafe( NS_FILE, $title );
  79                         if ( !is_object( $title ) ) {
  80                                 return null;
  81                         }
  82                 }
  83                 if ( $time ) {
  84                         if ( $this->oldFileFactory ) {
  85                                 return call_user_func( $this->oldFileFactory, $title, $this, $time );
  86                         } else {
  87                                 return false;
  88                         }
  89                 } else {
  90                         return call_user_func( $this->fileFactory, $title, $this );
  91                 }
  92         }
  93
  94         /**
  95          * Find an instance of the named file created at the specified time
  96          * Returns false if the file does not exist. Repositories not supporting
  97          * version control should return false if the time is specified.
  98          *
  99          * @param $title Mixed: Title object or string
 100          * @param $options array Associative array of options:
 101          *     time:           requested time for an archived image, or false for the
 102          *                     current version. An image object will be returned which was
 103          *                     created at the specified time.
 104          *
 105          *     ignoreRedirect: If true, do not follow file redirects
 106          *
 107          *     private:        If true, return restricted (deleted) files if the current
 108          *                     user is allowed to view them. Otherwise, such files will not
 109          *                     be found.
 110          *
 111          * @return File|false
 112          */
 113         function findFile( $title, $options = array() ) {
 114                 $time = isset( $options['time'] ) ? $options['time'] : false;
 115                 if ( !($title instanceof Title) ) {
 116                         $title = Title::makeTitleSafe( NS_FILE, $title );
 117                         if ( !is_object( $title ) ) {
 118                                 return false;
 119                         }
 120                 }
 121                 # First try the current version of the file to see if it precedes the timestamp
 122                 $img = $this->newFile( $title );
 123                 if ( !$img ) {
 124                         return false;
 125                 }
 126                 if ( $img->exists() && ( !$time || $img->getTimestamp() == $time ) ) {
 127                         return $img;
 128                 }
 129                 # Now try an old version of the file
 130                 if ( $time !== false ) {
 131                         $img = $this->newFile( $title, $time );
 132                         if ( $img && $img->exists() ) {
 133                                 if ( !$img->isDeleted( File::DELETED_FILE ) ) {
 134                                         return $img; // always OK
 135                                 } elseif ( !empty( $options['private'] ) && $img->userCan( File::DELETED_FILE ) ) {
 136                                         return $img;
 137                                 }
 138                         }
 139                 }
 140
 141                 # Now try redirects
 142                 if ( !empty( $options['ignoreRedirect'] ) ) {
 143                         return false;
 144                 }
 145                 $redir = $this->checkRedirect( $title );
 146                 if( $redir && $title->getNamespace() == NS_FILE) {
 147                         $img = $this->newFile( $redir );
 148                         if( !$img ) {
 149                                 return false;
 150                         }
 151                         if( $img->exists() ) {
 152                                 $img->redirectedFrom( $title->getDBkey() );
 153                                 return $img;
 154                         }
 155                 }
 156                 return false;
 157         }
 158
 159         /**
 160          * Find many files at once.
 161          * @param $items An array of titles, or an array of findFile() options with
 162          *    the "title" option giving the title. Example:
 163          *
 164          *     $findItem = array( 'title' => $title, 'private' => true );
 165          *     $findBatch = array( $findItem );
 166          *     $repo->findFiles( $findBatch );
 167          *
 168          * @return array
 169          */
 170         function findFiles( $items ) {
 171                 $result = array();
 172                 foreach ( $items as $item ) {
 173                         if ( is_array( $item ) ) {
 174                                 $title = $item['title'];
 175                                 $options = $item;
 176                                 unset( $options['title'] );
 177                         } else {
 178                                 $title = $item;
 179                                 $options = array();
 180                         }
 181                         $file = $this->findFile( $title, $options );
 182                         if ( $file ) {
 183                                 $result[$file->getTitle()->getDBkey()] = $file;
 184                         }
 185                 }
 186                 return $result;
 187         }
 188
 189         /**
 190          * Find an instance of the file with this key, created at the specified time
 191          * Returns false if the file does not exist. Repositories not supporting
 192          * version control should return false if the time is specified.
 193          *
 194          * @param $sha1 String base 36 SHA-1 hash
 195          * @param $options Option array, same as findFile().
 196          */
 197         function findFileFromKey( $sha1, $options = array() ) {
 198                 $time = isset( $options['time'] ) ? $options['time'] : false;
 199
 200                 # First try to find a matching current version of a file...
 201                 if ( $this->fileFactoryKey ) {
 202                         $img = call_user_func( $this->fileFactoryKey, $sha1, $this, $time );
 203                 } else {
 204                         return false; // find-by-sha1 not supported
 205                 }
 206                 if ( $img && $img->exists() ) {
 207                         return $img;
 208                 }
 209                 # Now try to find a matching old version of a file...
 210                 if ( $time !== false && $this->oldFileFactoryKey ) { // find-by-sha1 supported?
 211                         $img = call_user_func( $this->oldFileFactoryKey, $sha1, $this, $time );
 212                         if ( $img && $img->exists() ) {
 213                                 if ( !$img->isDeleted( File::DELETED_FILE ) ) {
 214                                         return $img; // always OK
 215                                 } elseif ( !empty( $options['private'] ) && $img->userCan( File::DELETED_FILE ) ) {
 216                                         return $img;
 217                                 }
 218                         }
 219                 }
 220                 return false;
 221         }
 222
 223         /**
 224          * Get the URL of thumb.php
 225          */
 226         function getThumbScriptUrl() {
 227                 return $this->thumbScriptUrl;
 228         }
 229
 230         /**
 231          * Get the URL corresponding to one of the four basic zones
 232          * @param $zone String: one of: public, deleted, temp, thumb
 233          * @return String or false
 234          */
 235         function getZoneUrl( $zone ) {
 236                 return false;
 237         }
 238
 239         /**
 240          * Returns true if the repository can transform files via a 404 handler
 241          *
 242          * @return bool
 243          */
 244         function canTransformVia404() {
 245                 return $this->transformVia404;
 246         }
 247
 248         /**
 249          * Get the name of an image from its title object
 250          * @param $title Title
 251          */
 252         function getNameFromTitle( Title $title ) {
 253                 if ( $this->initialCapital != MWNamespace::isCapitalized( NS_FILE ) ) {
 254                         global $wgContLang;
 255                         $name = $title->getUserCaseDBKey();
 256                         if ( $this->initialCapital ) {
 257                                 $name = $wgContLang->ucfirst( $name );
 258                         }
 259                 } else {
 260                         $name = $title->getDBkey();
 261                 }
 262                 return $name;
 263         }
 264
 265         /**
 266          * @param $name
 267          * @param $levels
 268          * @return string
 269          */
 270         static function getHashPathForLevel( $name, $levels ) {
 271                 if ( $levels == 0 ) {
 272                         return '';
 273                 } else {
 274                         $hash = md5( $name );
 275                         $path = '';
 276                         for ( $i = 1; $i <= $levels; $i++ ) {
 277                                 $path .= substr( $hash, 0, $i ) . '/';
 278                         }
 279                         return $path;
 280                 }
 281         }
 282
 283         /**
 284          * Get a relative path including trailing slash, e.g. f/fa/
 285          * If the repo is not hashed, returns an empty string
 286          *
 287          * @param $name string
 288          *
 289          * @return string
 290          */
 291         function getHashPath( $name ) {
 292                 return self::getHashPathForLevel( $name, $this->hashLevels );
 293         }
 294
 295         /**
 296          * Get the name of this repository, as specified by $info['name]' to the constructor
 297          */
 298         function getName() {
 299                 return $this->name;
 300         }
 301
 302         /**
 303          * Make an url to this repo
 304          *
 305          * @param $query mixed Query string to append
 306          * @param $entry string Entry point; defaults to index
 307          * @return string
 308          */
 309         function makeUrl( $query = '', $entry = 'index' ) {
 310                 $ext = isset( $this->scriptExtension ) ? $this->scriptExtension : '.php';
 311                 return wfAppendQuery( "{$this->scriptDirUrl}/{$entry}{$ext}", $query );
 312         }
 313
 314         /**
 315          * Get the URL of an image description page. May return false if it is
 316          * unknown or not applicable. In general this should only be called by the
 317          * File class, since it may return invalid results for certain kinds of
 318          * repositories. Use File::getDescriptionUrl() in user code.
 319          *
 320          * In particular, it uses the article paths as specified to the repository
 321          * constructor, whereas local repositories use the local Title functions.
 322          */
 323         function getDescriptionUrl( $name ) {
 324                 $encName = wfUrlencode( $name );
 325                 if ( !is_null( $this->descBaseUrl ) ) {
 326                         # "http://example.com/wiki/Image:"
 327                         return $this->descBaseUrl . $encName;
 328                 }
 329                 if ( !is_null( $this->articleUrl ) ) {
 330                         # "http://example.com/wiki/$1"
 331                         #
 332                         # We use "Image:" as the canonical namespace for
 333                         # compatibility across all MediaWiki versions.
 334                         return str_replace( '$1',
 335                                 "Image:$encName", $this->articleUrl );
 336                 }
 337                 if ( !is_null( $this->scriptDirUrl ) ) {
 338                         # "http://example.com/w"
 339                         #
 340                         # We use "Image:" as the canonical namespace for
 341                         # compatibility across all MediaWiki versions,
 342                         # and just sort of hope index.php is right. ;)
 343                         return $this->makeUrl( "title=Image:$encName" );
 344                 }
 345                 return false;
 346         }
 347
 348         /**
 349          * Get the URL of the content-only fragment of the description page. For
 350          * MediaWiki this means action=render. This should only be called by the
 351          * repository's file class, since it may return invalid results. User code
 352          * should use File::getDescriptionText().
 353          * @param $name String: name of image to fetch
 354          * @param $lang String: language to fetch it in, if any.
 355          */
 356         function getDescriptionRenderUrl( $name, $lang = null ) {
 357                 $query = 'action=render';
 358                 if ( !is_null( $lang ) ) {
 359                         $query .= '&uselang=' . $lang;
 360                 }
 361                 if ( isset( $this->scriptDirUrl ) ) {
 362                         return $this->makeUrl(
 363                                 'title=' .
 364                                 wfUrlencode( 'Image:' . $name ) .
 365                                 "&$query" );
 366                 } else {
 367                         $descUrl = $this->getDescriptionUrl( $name );
 368                         if ( $descUrl ) {
 369                                 return wfAppendQuery( $descUrl, $query );
 370                         } else {
 371                                 return false;
 372                         }
 373                 }
 374         }
 375
 376         /**
 377          * Get the URL of the stylesheet to apply to description pages
 378          * @return string
 379          */
 380         function getDescriptionStylesheetUrl() {
 381                 if ( $this->scriptDirUrl ) {
 382                         return $this->makeUrl( 'title=MediaWiki:Filepage.css&' .
 383                                 wfArrayToCGI( Skin::getDynamicStylesheetQuery() ) );
 384                 }
 385         }
 386
 387         /**
 388          * Store a file to a given destination.
 389          *
 390          * @param $srcPath String: source path or virtual URL
 391          * @param $dstZone String: destination zone
 392          * @param $dstRel String: destination relative path
 393          * @param $flags Integer: bitwise combination of the following flags:
 394          *     self::DELETE_SOURCE     Delete the source file after upload
 395          *     self::OVERWRITE         Overwrite an existing destination file instead of failing
 396          *     self::OVERWRITE_SAME    Overwrite the file if the destination exists and has the
 397          *                             same contents as the source
 398          * @return FileRepoStatus
 399          */
 400         function store( $srcPath, $dstZone, $dstRel, $flags = 0 ) {
 401                 $status = $this->storeBatch( array( array( $srcPath, $dstZone, $dstRel ) ), $flags );
 402                 if ( $status->successCount == 0 ) {
 403                         $status->ok = false;
 404                 }
 405                 return $status;
 406         }
 407
 408         /**
 409          * Store a batch of files
 410          *
 411          * @param $triplets Array: (src,zone,dest) triplets as per store()
 412          * @param $flags Integer: flags as per store
 413          */
 414         abstract function storeBatch( $triplets, $flags = 0 );
 415
 416         /**
 417          * Pick a random name in the temp zone and store a file to it.
 418          * Returns a FileRepoStatus object with the URL in the value.
 419          *
 420          * @param $originalName String: the base name of the file as specified
 421          *     by the user. The file extension will be maintained.
 422          * @param $srcPath String: the current location of the file.
 423          */
 424         abstract function storeTemp( $originalName, $srcPath );
 425
 426
 427         /**
 428          * Append the contents of the source path to the given file, OR queue
 429          * the appending operation in anticipation of a later appendFinish() call.
 430          * @param $srcPath String: location of the source file
 431          * @param $toAppendPath String: path to append to.
 432          * @param $flags Integer: bitfield, may be FileRepo::DELETE_SOURCE to indicate
 433          *        that the source file should be deleted if possible
 434          * @return mixed Status or false
 435          */
 436         abstract function append( $srcPath, $toAppendPath, $flags = 0 );
 437
 438         /**
 439          * Finish the append operation.
 440          * @param $toAppendPath String: path to append to.
 441          * @return mixed Status or false
 442          */
 443         abstract function appendFinish( $toAppendPath );
 444
 445         /**
 446          * Remove a temporary file or mark it for garbage collection
 447          * @param $virtualUrl String: the virtual URL returned by storeTemp
 448          * @return Boolean: true on success, false on failure
 449          * STUB
 450          */
 451         function freeTemp( $virtualUrl ) {
 452                 return true;
 453         }
 454
 455         /**
 456          * Copy or move a file either from the local filesystem or from an mwrepo://
 457          * virtual URL, into this repository at the specified destination location.
 458          *
 459          * Returns a FileRepoStatus object. On success, the value contains "new" or
 460          * "archived", to indicate whether the file was new with that name.
 461          *
 462          * @param $srcPath String: the source path or URL
 463          * @param $dstRel String: the destination relative path
 464          * @param $archiveRel String: rhe relative path where the existing file is to
 465          *        be archived, if there is one. Relative to the public zone root.
 466          * @param $flags Integer: bitfield, may be FileRepo::DELETE_SOURCE to indicate
 467          *        that the source file should be deleted if possible
 468          */
 469         function publish( $srcPath, $dstRel, $archiveRel, $flags = 0 ) {
 470                 $status = $this->publishBatch( array( array( $srcPath, $dstRel, $archiveRel ) ), $flags );
 471                 if ( $status->successCount == 0 ) {
 472                         $status->ok = false;
 473                 }
 474                 if ( isset( $status->value[0] ) ) {
 475                         $status->value = $status->value[0];
 476                 } else {
 477                         $status->value = false;
 478                 }
 479                 return $status;
 480         }
 481
 482         /**
 483          * Publish a batch of files
 484          * @param $triplets Array: (source,dest,archive) triplets as per publish()
 485          * @param $flags Integer: bitfield, may be FileRepo::DELETE_SOURCE to indicate
 486          *        that the source files should be deleted if possible
 487          */
 488         abstract function publishBatch( $triplets, $flags = 0 );
 489
 490         /**
 491          * @param $file
 492          * @param int $flags
 493          * @return bool
 494          */
 495         function fileExists( $file, $flags = 0 ) {
 496                 $result = $this->fileExistsBatch( array( $file ), $flags );
 497                 return $result[0];
 498         }
 499
 500         /**
 501          * Checks existence of an array of files.
 502          *
 503          * @param $files Array: URLs (or paths) of files to check
 504          * @param $flags Integer: bitwise combination of the following flags:
 505          *     self::FILES_ONLY     Mark file as existing only if it is a file (not directory)
 506          * @return Either array of files and existence flags, or false
 507          */
 508         abstract function fileExistsBatch( $files, $flags = 0 );
 509
 510         /**
 511          * Move a group of files to the deletion archive.
 512          *
 513          * If no valid deletion archive is configured, this may either delete the
 514          * file or throw an exception, depending on the preference of the repository.
 515          *
 516          * The overwrite policy is determined by the repository -- currently FSRepo
 517          * assumes a naming scheme in the deleted zone based on content hash, as
 518          * opposed to the public zone which is assumed to be unique.
 519          *
 520          * @param $sourceDestPairs Array of source/destination pairs. Each element
 521          *        is a two-element array containing the source file path relative to the
 522          *        public root in the first element, and the archive file path relative
 523          *        to the deleted zone root in the second element.
 524          * @return FileRepoStatus
 525          */
 526         abstract function deleteBatch( $sourceDestPairs );
 527
 528         /**
 529          * Move a file to the deletion archive.
 530          * If no valid deletion archive exists, this may either delete the file
 531          * or throw an exception, depending on the preference of the repository
 532          * @param $srcRel Mixed: relative path for the file to be deleted
 533          * @param $archiveRel Mixed: relative path for the archive location.
 534          *        Relative to a private archive directory.
 535          * @return FileRepoStatus object
 536          */
 537         function delete( $srcRel, $archiveRel ) {
 538                 return $this->deleteBatch( array( array( $srcRel, $archiveRel ) ) );
 539         }
 540
 541         /**
 542          * Get properties of a file with a given virtual URL
 543          * The virtual URL must refer to this repo
 544          * Properties should ultimately be obtained via File::getPropsFromPath()
 545          *
 546          * @param $virtualUrl string
 547          */
 548         abstract function getFileProps( $virtualUrl );
 549
 550         /**
 551          * Call a callback function for every file in the repository
 552          * May use either the database or the filesystem
 553          * STUB
 554          */
 555         function enumFiles( $callback ) {
 556                 throw new MWException( 'enumFiles is not supported by ' . get_class( $this ) );
 557         }
 558
 559         /**
 560          * Determine if a relative path is valid, i.e. not blank or involving directory traveral
 561          *
 562          * @param $filename string
 563          *
 564          * @return bool
 565          */
 566         function validateFilename( $filename ) {
 567                 if ( strval( $filename ) == '' ) {
 568                         return false;
 569                 }
 570                 if ( wfIsWindows() ) {
 571                         $filename = strtr( $filename, '\\', '/' );
 572                 }
 573                 /**
 574                  * Use the same traversal protection as Title::secureAndSplit()
 575                  */
 576                 if ( strpos( $filename, '.' ) !== false &&
 577                         ( $filename === '.' || $filename === '..' ||
 578                                 strpos( $filename, './' ) === 0  ||
 579                                 strpos( $filename, '../' ) === 0 ||
 580                                 strpos( $filename, '/./' ) !== false ||
 581                                 strpos( $filename, '/../' ) !== false ) )
 582                 {
 583                         return false;
 584                 } else {
 585                         return true;
 586                 }
 587         }
 588
 589         /**#@+
 590          * Path disclosure protection functions
 591          */
 592         function paranoidClean( $param ) { return '[hidden]'; }
 593
 594         /**
 595          * @param $param
 596          * @return
 597          */
 598         function passThrough( $param ) { return $param; }
 599
 600         /**
 601          * Get a callback function to use for cleaning error message parameters
 602          */
 603         function getErrorCleanupFunction() {
 604                 switch ( $this->pathDisclosureProtection ) {
 605                         case 'none':
 606                                 $callback = array( $this, 'passThrough' );
 607                                 break;
 608                         default: // 'paranoid'
 609                                 $callback = array( $this, 'paranoidClean' );
 610                 }
 611                 return $callback;
 612         }
 613         /**#@-*/
 614
 615         /**
 616          * Create a new fatal error
 617          */
 618         function newFatal( $message /*, parameters...*/ ) {
 619                 $params = func_get_args();
 620                 array_unshift( $params, $this );
 621                 return MWInit::callStaticMethod( 'FileRepoStatus', 'newFatal', $params );
 622         }
 623
 624         /**
 625          * Create a new good result
 626          *
 627          * @return FileRepoStatus
 628          */
 629         function newGood( $value = null ) {
 630                 return FileRepoStatus::newGood( $this, $value );
 631         }
 632
 633         /**
 634          * Delete files in the deleted directory if they are not referenced in the filearchive table
 635          * STUB
 636          */
 637         function cleanupDeletedBatch( $storageKeys ) {}
 638
 639         /**
 640          * Checks if there is a redirect named as $title. If there is, return the
 641          * title object. If not, return false.
 642          * STUB
 643          *
 644          * @param $title Title of image
 645          * @return Bool
 646          */
 647         function checkRedirect( Title $title ) {
 648                 return false;
 649         }
 650
 651         /**
 652          * Invalidates image redirect cache related to that image
 653          * Doesn't do anything for repositories that don't support image redirects.
 654          *
 655          * STUB
 656          * @param $title Title of image
 657          */
 658         function invalidateImageRedirect( $title ) {}
 659
 660         /**
 661          * Get an array or iterator of file objects for files that have a given
 662          * SHA-1 content hash.
 663          *
 664          * STUB
 665          */
 666         function findBySha1( $hash ) {
 667                 return array();
 668         }
 669
 670         /**
 671          * Get the human-readable name of the repo.
 672          * @return string
 673          */
 674         public function getDisplayName() {
 675                 // We don't name our own repo, return nothing
 676                 if ( $this->isLocal() ) {
 677                         return null;
 678                 }
 679                 // 'shared-repo-name-wikimediacommons' is used when $wgUseInstantCommons = true
 680                 return wfMessageFallback( 'shared-repo-name-' . $this->name, 'shared-repo' )->text();
 681         }
 682
 683         /**
 684          * Returns true if this the local file repository.
 685          *
 686          * @return bool
 687          */
 688         function isLocal() {
 689                 return $this->getName() == 'local';
 690         }
 691
 692         /**
 693          * Get a key on the primary cache for this repository.
 694          * Returns false if the repository's cache is not accessible at this site.
 695          * The parameters are the parts of the key, as for wfMemcKey().
 696          *
 697          * STUB
 698          */
 699         function getSharedCacheKey( /*...*/ ) {
 700                 return false;
 701         }
 702
 703         /**
 704          * Get a key for this repo in the local cache domain. These cache keys are
 705          * not shared with remote instances of the repo.
 706          * The parameters are the parts of the key, as for wfMemcKey().
 707          */
 708         function getLocalCacheKey( /*...*/ ) {
 709                 $args = func_get_args();
 710                 array_unshift( $args, 'filerepo', $this->getName() );
 711                 return call_user_func_array( 'wfMemcKey', $args );
 712         }
 713
 714         /**
 715          * Get an UploadStash associated with this repo.
 716          *
 717          * @return UploadStash
 718          */
 719         function getUploadStash() {
 720                 return new UploadStash( $this );
 721         }
 722 }