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         static function isVirtualUrl( $url ) {
  57                 return substr( $url, 0, 9 ) == 'mwrepo://';
  58         }
  59
  60         /**
  61          * Create a new File object from the local repository
  62          *
  63          * @param $title Mixed: Title object or string
  64          * @param $time Mixed: Time at which the image was uploaded.
  65          *              If this is specified, the returned object will be an
  66          *              instance of the repository's old file class instead of a
  67          *              current file. Repositories not supporting version control
  68          *              should return false if this parameter is set.
  69          *
  70          * @return File
  71          */
  72         function newFile( $title, $time = false ) {
  73                 if ( !($title instanceof Title) ) {
  74                         $title = Title::makeTitleSafe( NS_FILE, $title );
  75                         if ( !is_object( $title ) ) {
  76                                 return null;
  77                         }
  78                 }
  79                 if ( $time ) {
  80                         if ( $this->oldFileFactory ) {
  81                                 return call_user_func( $this->oldFileFactory, $title, $this, $time );
  82                         } else {
  83                                 return false;
  84                         }
  85                 } else {
  86                         return call_user_func( $this->fileFactory, $title, $this );
  87                 }
  88         }
  89
  90         /**
  91          * Find an instance of the named file created at the specified time
  92          * Returns false if the file does not exist. Repositories not supporting
  93          * version control should return false if the time is specified.
  94          *
  95          * @param $title Mixed: Title object or string
  96          * @param $options Associative array of options:
  97          *     time:           requested time for an archived image, or false for the
  98          *                     current version. An image object will be returned which was
  99          *                     created at the specified time.
 100          *
 101          *     ignoreRedirect: If true, do not follow file redirects
 102          *
 103          *     private:        If true, return restricted (deleted) files if the current
 104          *                     user is allowed to view them. Otherwise, such files will not
 105          *                     be found.
 106          */
 107         function findFile( $title, $options = array() ) {
 108                 if ( !is_array( $options ) ) {
 109                         // MW 1.15 compat
 110                         $time = $options;
 111                 } else {
 112                         $time = isset( $options['time'] ) ? $options['time'] : false;
 113                 }
 114                 if ( !($title instanceof Title) ) {
 115                         $title = Title::makeTitleSafe( NS_FILE, $title );
 116                         if ( !is_object( $title ) ) {
 117                                 return false;
 118                         }
 119                 }
 120                 # First try the current version of the file to see if it precedes the timestamp
 121                 $img = $this->newFile( $title );
 122                 if ( !$img ) {
 123                         return false;
 124                 }
 125                 if ( $img->exists() && ( !$time || $img->getTimestamp() == $time ) ) {
 126                         return $img;
 127                 }
 128                 # Now try an old version of the file
 129                 if ( $time !== false ) {
 130                         $img = $this->newFile( $title, $time );
 131                         if ( $img && $img->exists() ) {
 132                                 if ( !$img->isDeleted(File::DELETED_FILE) ) {
 133                                         return $img;
 134                                 } else if ( !empty( $options['private'] )  && $img->userCan(File::DELETED_FILE) ) {
 135                                         return $img;
 136                                 }
 137                         }
 138                 }
 139
 140                 # Now try redirects
 141                 if ( !empty( $options['ignoreRedirect'] ) ) {
 142                         return false;
 143                 }
 144                 $redir = $this->checkRedirect( $title );
 145                 if( $redir && $title->getNamespace() == NS_FILE) {
 146                         $img = $this->newFile( $redir );
 147                         if( !$img ) {
 148                                 return false;
 149                         }
 150                         if( $img->exists() ) {
 151                                 $img->redirectedFrom( $title->getDBkey() );
 152                                 return $img;
 153                         }
 154                 }
 155                 return false;
 156         }
 157
 158         /*
 159          * Find many files at once.
 160          * @param $items An array of titles, or an array of findFile() options with
 161          *    the "title" option giving the title. Example:
 162          *
 163          *     $findItem = array( 'title' => $title, 'private' => true );
 164          *     $findBatch = array( $findItem );
 165          *     $repo->findFiles( $findBatch );
 166          */
 167         function findFiles( $items ) {
 168                 $result = array();
 169                 foreach ( $items as $item ) {
 170                         if ( is_array( $item ) ) {
 171                                 $title = $item['title'];
 172                                 $options = $item;
 173                                 unset( $options['title'] );
 174                         } else {
 175                                 $title = $item;
 176                                 $options = array();
 177                         }
 178                         $file = $this->findFile( $title, $options );
 179                         if ( $file ) {
 180                                 $result[$file->getTitle()->getDBkey()] = $file;
 181                         }
 182                 }
 183                 return $result;
 184         }
 185
 186         /**
 187          * Create a new File object from the local repository
 188          * @param $sha1 Mixed: SHA-1 key
 189          * @param $time Mixed: time at which the image was uploaded.
 190          *              If this is specified, the returned object will be an
 191          *              of the repository's old file class instead of a current
 192          *              file. Repositories not supporting version control should
 193          *              return false if this parameter is set.
 194          *
 195          * @return File
 196          */
 197         function newFileFromKey( $sha1, $time = false ) {
 198                 if ( $time ) {
 199                         if ( $this->oldFileFactoryKey ) {
 200                                 return call_user_func( $this->oldFileFactoryKey, $sha1, $this, $time );
 201                         } else {
 202                                 return false;
 203                         }
 204                 } else {
 205                         return call_user_func( $this->fileFactoryKey, $sha1, $this );
 206                 }
 207         }
 208
 209         /**
 210          * Find an instance of the file with this key, created at the specified time
 211          * Returns false if the file does not exist. Repositories not supporting
 212          * version control should return false if the time is specified.
 213          *
 214          * @param $sha1 String
 215          * @param $options Option array, same as findFile().
 216          */
 217         function findFileFromKey( $sha1, $options = array() ) {
 218                 if ( !is_array( $options ) ) {
 219                         # MW 1.15 compat
 220                         $time = $options;
 221                 } else {
 222                         $time = isset( $options['time'] ) ? $options['time'] : false;
 223                 }
 224
 225                 # First try the current version of the file to see if it precedes the timestamp
 226                 $img = $this->newFileFromKey( $sha1 );
 227                 if ( !$img ) {
 228                         return false;
 229                 }
 230                 if ( $img->exists() && ( !$time || $img->getTimestamp() == $time ) ) {
 231                         return $img;
 232                 }
 233                 # Now try an old version of the file
 234                 if ( $time !== false ) {
 235                         $img = $this->newFileFromKey( $sha1, $time );
 236                         if ( $img->exists() ) {
 237                                 if ( !$img->isDeleted(File::DELETED_FILE) ) {
 238                                         return $img;
 239                                 } else if ( !empty( $options['private'] ) && $img->userCan(File::DELETED_FILE) ) {
 240                                         return $img;
 241                                 }
 242                         }
 243                 }
 244                 return false;
 245         }
 246
 247         /**
 248          * Get the URL of thumb.php
 249          */
 250         function getThumbScriptUrl() {
 251                 return $this->thumbScriptUrl;
 252         }
 253
 254         /**
 255          * Get the URL corresponding to one of the four basic zones
 256          * @param $zone String: one of: public, deleted, temp, thumb
 257          * @return String or false
 258          */
 259         function getZoneUrl( $zone ) {
 260                 return false;
 261         }
 262
 263         /**
 264          * Returns true if the repository can transform files via a 404 handler
 265          */
 266         function canTransformVia404() {
 267                 return $this->transformVia404;
 268         }
 269
 270         /**
 271          * Get the name of an image from its title object
 272          * @param $title Title
 273          */
 274         function getNameFromTitle( $title ) {
 275                 if ( $this->initialCapital != MWNamespace::isCapitalized( NS_FILE ) ) {
 276                         global $wgContLang;
 277                         $name = $title->getUserCaseDBKey();
 278                         if ( $this->initialCapital ) {
 279                                 $name = $wgContLang->ucfirst( $name );
 280                         }
 281                 } else {
 282                         $name = $title->getDBkey();
 283                 }
 284                 return $name;
 285         }
 286
 287         static function getHashPathForLevel( $name, $levels ) {
 288                 if ( $levels == 0 ) {
 289                         return '';
 290                 } else {
 291                         $hash = md5( $name );
 292                         $path = '';
 293                         for ( $i = 1; $i <= $levels; $i++ ) {
 294                                 $path .= substr( $hash, 0, $i ) . '/';
 295                         }
 296                         return $path;
 297                 }
 298         }
 299
 300         /**
 301          * Get a relative path including trailing slash, e.g. f/fa/
 302          * If the repo is not hashed, returns an empty string
 303          */
 304         function getHashPath( $name ) {
 305                 return self::getHashPathForLevel( $name, $this->hashLevels );
 306         }
 307
 308         /**
 309          * Get the name of this repository, as specified by $info['name]' to the constructor
 310          */
 311         function getName() {
 312                 return $this->name;
 313         }
 314
 315         /**
 316          * Make an url to this repo
 317          *
 318          * @param $query mixed Query string to append
 319          * @param $entry string Entry point; defaults to index
 320          * @return string
 321          */
 322         function makeUrl( $query = '', $entry = 'index' ) {
 323                 $ext = isset( $this->scriptExtension ) ? $this->scriptExtension : '.php';
 324                 return wfAppendQuery( "{$this->scriptDirUrl}/{$entry}{$ext}", $query );
 325         }
 326
 327         /**
 328          * Get the URL of an image description page. May return false if it is
 329          * unknown or not applicable. In general this should only be called by the
 330          * File class, since it may return invalid results for certain kinds of
 331          * repositories. Use File::getDescriptionUrl() in user code.
 332          *
 333          * In particular, it uses the article paths as specified to the repository
 334          * constructor, whereas local repositories use the local Title functions.
 335          */
 336         function getDescriptionUrl( $name ) {
 337                 $encName = wfUrlencode( $name );
 338                 if ( !is_null( $this->descBaseUrl ) ) {
 339                         # "http://example.com/wiki/Image:"
 340                         return $this->descBaseUrl . $encName;
 341                 }
 342                 if ( !is_null( $this->articleUrl ) ) {
 343                         # "http://example.com/wiki/$1"
 344                         #
 345                         # We use "Image:" as the canonical namespace for
 346                         # compatibility across all MediaWiki versions.
 347                         return str_replace( '$1',
 348                                 "Image:$encName", $this->articleUrl );
 349                 }
 350                 if ( !is_null( $this->scriptDirUrl ) ) {
 351                         # "http://example.com/w"
 352                         #
 353                         # We use "Image:" as the canonical namespace for
 354                         # compatibility across all MediaWiki versions,
 355                         # and just sort of hope index.php is right. ;)
 356                         return $this->makeUrl( "title=Image:$encName" );
 357                 }
 358                 return false;
 359         }
 360
 361         /**
 362          * Get the URL of the content-only fragment of the description page. For
 363          * MediaWiki this means action=render. This should only be called by the
 364          * repository's file class, since it may return invalid results. User code
 365          * should use File::getDescriptionText().
 366          * @param $name String: name of image to fetch
 367          * @param $lang String: language to fetch it in, if any.
 368          */
 369         function getDescriptionRenderUrl( $name, $lang = null ) {
 370                 $query = 'action=render';
 371                 if ( !is_null( $lang ) ) {
 372                         $query .= '&uselang=' . $lang;
 373                 }
 374                 if ( isset( $this->scriptDirUrl ) ) {
 375                         return $this->makeUrl(
 376                                 'title=' .
 377                                 wfUrlencode( 'Image:' . $name ) .
 378                                 "&$query" );
 379                 } else {
 380                         $descUrl = $this->getDescriptionUrl( $name );
 381                         if ( $descUrl ) {
 382                                 return wfAppendQuery( $descUrl, $query );
 383                         } else {
 384                                 return false;
 385                         }
 386                 }
 387         }
 388
 389         /**
 390          * Get the URL of the stylesheet to apply to description pages
 391          * @return string
 392          */
 393         function getDescriptionStylesheetUrl() {
 394                 if ( $this->scriptDirUrl ) {
 395                         return $this->makeUrl( 'title=MediaWiki:Filepage.css&' .
 396                                 wfArrayToCGI( Skin::getDynamicStylesheetQuery() ) );
 397                 }
 398         }
 399
 400         /**
 401          * Store a file to a given destination.
 402          *
 403          * @param $srcPath String: source path or virtual URL
 404          * @param $dstZone String: destination zone
 405          * @param $dstRel String: destination relative path
 406          * @param $flags Integer: bitwise combination of the following flags:
 407          *     self::DELETE_SOURCE     Delete the source file after upload
 408          *     self::OVERWRITE         Overwrite an existing destination file instead of failing
 409          *     self::OVERWRITE_SAME    Overwrite the file if the destination exists and has the
 410          *                             same contents as the source
 411          * @return FileRepoStatus
 412          */
 413         function store( $srcPath, $dstZone, $dstRel, $flags = 0 ) {
 414                 $status = $this->storeBatch( array( array( $srcPath, $dstZone, $dstRel ) ), $flags );
 415                 if ( $status->successCount == 0 ) {
 416                         $status->ok = false;
 417                 }
 418                 return $status;
 419         }
 420
 421         /**
 422          * Store a batch of files
 423          *
 424          * @param $triplets Array: (src,zone,dest) triplets as per store()
 425          * @param $flags Integer: flags as per store
 426          */
 427         abstract function storeBatch( $triplets, $flags = 0 );
 428
 429         /**
 430          * Pick a random name in the temp zone and store a file to it.
 431          * Returns a FileRepoStatus object with the URL in the value.
 432          *
 433          * @param $originalName String: the base name of the file as specified
 434          *     by the user. The file extension will be maintained.
 435          * @param $srcPath String: the current location of the file.
 436          */
 437         abstract function storeTemp( $originalName, $srcPath );
 438
 439
 440         /**
 441          * Append the contents of the source path to the given file.
 442          * @param $srcPath String: location of the source file
 443          * @param $toAppendPath String: path to append to.
 444          * @param $flags Integer: bitfield, may be FileRepo::DELETE_SOURCE to indicate
 445          *        that the source file should be deleted if possible
 446          * @return mixed Status or false
 447          */
 448         abstract function append( $srcPath, $toAppendPath, $flags = 0 );
 449
 450         /**
 451          * Remove a temporary file or mark it for garbage collection
 452          * @param $virtualUrl String: the virtual URL returned by storeTemp
 453          * @return Boolean: true on success, false on failure
 454          * STUB
 455          */
 456         function freeTemp( $virtualUrl ) {
 457                 return true;
 458         }
 459
 460         /**
 461          * Copy or move a file either from the local filesystem or from an mwrepo://
 462          * virtual URL, into this repository at the specified destination location.
 463          *
 464          * Returns a FileRepoStatus object. On success, the value contains "new" or
 465          * "archived", to indicate whether the file was new with that name.
 466          *
 467          * @param $srcPath String: the source path or URL
 468          * @param $dstRel String: the destination relative path
 469          * @param $archiveRel String: rhe relative path where the existing file is to
 470          *        be archived, if there is one. Relative to the public zone root.
 471          * @param $flags Integer: bitfield, may be FileRepo::DELETE_SOURCE to indicate
 472          *        that the source file should be deleted if possible
 473          */
 474         function publish( $srcPath, $dstRel, $archiveRel, $flags = 0 ) {
 475                 $status = $this->publishBatch( array( array( $srcPath, $dstRel, $archiveRel ) ), $flags );
 476                 if ( $status->successCount == 0 ) {
 477                         $status->ok = false;
 478                 }
 479                 if ( isset( $status->value[0] ) ) {
 480                         $status->value = $status->value[0];
 481                 } else {
 482                         $status->value = false;
 483                 }
 484                 return $status;
 485         }
 486
 487         /**
 488          * Publish a batch of files
 489          * @param $triplets Array: (source,dest,archive) triplets as per publish()
 490          * @param $flags Integer: bitfield, may be FileRepo::DELETE_SOURCE to indicate
 491          *        that the source files should be deleted if possible
 492          */
 493         abstract function publishBatch( $triplets, $flags = 0 );
 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         abstract function getFileProps( $virtualUrl );
 547
 548         /**
 549          * Call a callback function for every file in the repository
 550          * May use either the database or the filesystem
 551          * STUB
 552          */
 553         function enumFiles( $callback ) {
 554                 throw new MWException( 'enumFiles is not supported by ' . get_class( $this ) );
 555         }
 556
 557         /**
 558          * Determine if a relative path is valid, i.e. not blank or involving directory traveral
 559          */
 560         function validateFilename( $filename ) {
 561                 if ( strval( $filename ) == '' ) {
 562                         return false;
 563                 }
 564                 if ( wfIsWindows() ) {
 565                         $filename = strtr( $filename, '\\', '/' );
 566                 }
 567                 /**
 568                  * Use the same traversal protection as Title::secureAndSplit()
 569                  */
 570                 if ( strpos( $filename, '.' ) !== false &&
 571                      ( $filename === '.' || $filename === '..' ||
 572                        strpos( $filename, './' ) === 0  ||
 573                        strpos( $filename, '../' ) === 0 ||
 574                        strpos( $filename, '/./' ) !== false ||
 575                        strpos( $filename, '/../' ) !== false ) )
 576                 {
 577                         return false;
 578                 } else {
 579                         return true;
 580                 }
 581         }
 582
 583         /**#@+
 584          * Path disclosure protection functions
 585          */
 586         function paranoidClean( $param ) { return '[hidden]'; }
 587         function passThrough( $param ) { return $param; }
 588
 589         /**
 590          * Get a callback function to use for cleaning error message parameters
 591          */
 592         function getErrorCleanupFunction() {
 593                 switch ( $this->pathDisclosureProtection ) {
 594                         case 'none':
 595                                 $callback = array( $this, 'passThrough' );
 596                                 break;
 597                         default: // 'paranoid'
 598                                 $callback = array( $this, 'paranoidClean' );
 599                 }
 600                 return $callback;
 601         }
 602         /**#@-*/
 603
 604         /**
 605          * Create a new fatal error
 606          */
 607         function newFatal( $message /*, parameters...*/ ) {
 608                 $params = func_get_args();
 609                 array_unshift( $params, $this );
 610                 return call_user_func_array( array( 'FileRepoStatus', 'newFatal' ), $params );
 611         }
 612
 613         /**
 614          * Create a new good result
 615          */
 616         function newGood( $value = null ) {
 617                 return FileRepoStatus::newGood( $this, $value );
 618         }
 619
 620         /**
 621          * Delete files in the deleted directory if they are not referenced in the filearchive table
 622          * STUB
 623          */
 624         function cleanupDeletedBatch( $storageKeys ) {}
 625
 626         /**
 627          * Checks if there is a redirect named as $title. If there is, return the
 628          * title object. If not, return false.
 629          * STUB
 630          *
 631          * @param $title Title of image
 632          * @return Bool
 633          */
 634         function checkRedirect( $title ) {
 635                 return false;
 636         }
 637
 638         /**
 639          * Invalidates image redirect cache related to that image
 640          * Doesn't do anything for repositories that don't support image redirects.
 641          *
 642          * STUB
 643          * @param $title Title of image
 644          */
 645         function invalidateImageRedirect( $title ) {}
 646
 647         /**
 648          * Get an array or iterator of file objects for files that have a given
 649          * SHA-1 content hash.
 650          *
 651          * STUB
 652          */
 653         function findBySha1( $hash ) {
 654                 return array();
 655         }
 656
 657         /**
 658          * Get the human-readable name of the repo.
 659          * @return string
 660          */
 661         public function getDisplayName() {
 662                 // We don't name our own repo, return nothing
 663                 if ( $this->isLocal() ) {
 664                         return null;
 665                 }
 666                 // 'shared-repo-name-wikimediacommons' is used when $wgUseInstantCommons = true
 667                 return wfMessageFallback( 'shared-repo-name-' . $this->name, 'shared-repo' )->text();
 668         }
 669
 670         /**
 671          * Returns true if this the local file repository.
 672          *
 673          * @return bool
 674          */
 675         function isLocal() {
 676                 return $this->getName() == 'local';
 677         }
 678
 679
 680         /**
 681          * Get a key on the primary cache for this repository.
 682          * Returns false if the repository's cache is not accessible at this site.
 683          * The parameters are the parts of the key, as for wfMemcKey().
 684          *
 685          * STUB
 686          */
 687         function getSharedCacheKey( /*...*/ ) {
 688                 return false;
 689         }
 690
 691         /**
 692          * Get a key for this repo in the local cache domain. These cache keys are
 693          * not shared with remote instances of the repo.
 694          * The parameters are the parts of the key, as for wfMemcKey().
 695          */
 696         function getLocalCacheKey( /*...*/ ) {
 697                 $args = func_get_args();
 698                 array_unshift( $args, 'filerepo', $this->getName() );
 699                 return call_user_func_array( 'wfMemcKey', $args );
 700         }
 701
 702         /**
 703          * Get an UploadStash associated with this repo.
 704          *
 705          * @return UploadStash
 706          */
 707         function getUploadStash() {
 708                 return new UploadStash( $this );
 709         }
 710 }