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|null A File, or null if passed an invalid Title
  75          */
  76         function newFile( $title, $time = false ) {
  77                 $title = File::normalizeTitle( $title );
  78                 if ( !$title ) {
  79                         return null;
  80                 }
  81                 if ( $time ) {
  82                         if ( $this->oldFileFactory ) {
  83                                 return call_user_func( $this->oldFileFactory, $title, $this, $time );
  84                         } else {
  85                                 return false;
  86                         }
  87                 } else {
  88                         return call_user_func( $this->fileFactory, $title, $this );
  89                 }
  90         }
  91
  92         /**
  93          * Find an instance of the named file created at the specified time
  94          * Returns false if the file does not exist. Repositories not supporting
  95          * version control should return false if the time is specified.
  96          *
  97          * @param $title Mixed: Title object or string
  98          * @param $options array Associative array of options:
  99          *     time:           requested time for an archived image, or false for the
 100          *                     current version. An image object will be returned which was
 101          *                     created at the specified time.
 102          *
 103          *     ignoreRedirect: If true, do not follow file redirects
 104          *
 105          *     private:        If true, return restricted (deleted) files if the current
 106          *                     user is allowed to view them. Otherwise, such files will not
 107          *                     be found.
 108          *
 109          * @return File|false
 110          */
 111         function findFile( $title, $options = array() ) {
 112                 $title = File::normalizeTitle( $title );
 113                 if ( !$title ) {
 114                         return false;
 115                 }
 116                 $time = isset( $options['time'] ) ? $options['time'] : false;
 117                 # First try the current version of the file to see if it precedes the timestamp
 118                 $img = $this->newFile( $title );
 119                 if ( !$img ) {
 120                         return false;
 121                 }
 122                 if ( $img->exists() && ( !$time || $img->getTimestamp() == $time ) ) {
 123                         return $img;
 124                 }
 125                 # Now try an old version of the file
 126                 if ( $time !== false ) {
 127                         $img = $this->newFile( $title, $time );
 128                         if ( $img && $img->exists() ) {
 129                                 if ( !$img->isDeleted( File::DELETED_FILE ) ) {
 130                                         return $img; // always OK
 131                                 } elseif ( !empty( $options['private'] ) && $img->userCan( File::DELETED_FILE ) ) {
 132                                         return $img;
 133                                 }
 134                         }
 135                 }
 136
 137                 # Now try redirects
 138                 if ( !empty( $options['ignoreRedirect'] ) ) {
 139                         return false;
 140                 }
 141                 $redir = $this->checkRedirect( $title );
 142                 if( $redir && $title->getNamespace() == NS_FILE) {
 143                         $img = $this->newFile( $redir );
 144                         if( !$img ) {
 145                                 return false;
 146                         }
 147                         if( $img->exists() ) {
 148                                 $img->redirectedFrom( $title->getDBkey() );
 149                                 return $img;
 150                         }
 151                 }
 152                 return false;
 153         }
 154
 155         /**
 156          * Find many files at once.
 157          * @param $items An array of titles, or an array of findFile() options with
 158          *    the "title" option giving the title. Example:
 159          *
 160          *     $findItem = array( 'title' => $title, 'private' => true );
 161          *     $findBatch = array( $findItem );
 162          *     $repo->findFiles( $findBatch );
 163          *
 164          * @return array
 165          */
 166         function findFiles( $items ) {
 167                 $result = array();
 168                 foreach ( $items as $item ) {
 169                         if ( is_array( $item ) ) {
 170                                 $title = $item['title'];
 171                                 $options = $item;
 172                                 unset( $options['title'] );
 173                         } else {
 174                                 $title = $item;
 175                                 $options = array();
 176                         }
 177                         $file = $this->findFile( $title, $options );
 178                         if ( $file ) {
 179                                 $result[$file->getTitle()->getDBkey()] = $file;
 180                         }
 181                 }
 182                 return $result;
 183         }
 184
 185         /**
 186          * Find an instance of the file with this key, created at the specified time
 187          * Returns false if the file does not exist. Repositories not supporting
 188          * version control should return false if the time is specified.
 189          *
 190          * @param $sha1 String base 36 SHA-1 hash
 191          * @param $options Option array, same as findFile().
 192          */
 193         function findFileFromKey( $sha1, $options = array() ) {
 194                 $time = isset( $options['time'] ) ? $options['time'] : false;
 195
 196                 # First try to find a matching current version of a file...
 197                 if ( $this->fileFactoryKey ) {
 198                         $img = call_user_func( $this->fileFactoryKey, $sha1, $this, $time );
 199                 } else {
 200                         return false; // find-by-sha1 not supported
 201                 }
 202                 if ( $img && $img->exists() ) {
 203                         return $img;
 204                 }
 205                 # Now try to find a matching old version of a file...
 206                 if ( $time !== false && $this->oldFileFactoryKey ) { // find-by-sha1 supported?
 207                         $img = call_user_func( $this->oldFileFactoryKey, $sha1, $this, $time );
 208                         if ( $img && $img->exists() ) {
 209                                 if ( !$img->isDeleted( File::DELETED_FILE ) ) {
 210                                         return $img; // always OK
 211                                 } elseif ( !empty( $options['private'] ) && $img->userCan( File::DELETED_FILE ) ) {
 212                                         return $img;
 213                                 }
 214                         }
 215                 }
 216                 return false;
 217         }
 218
 219         /**
 220          * Get the URL of thumb.php
 221          */
 222         function getThumbScriptUrl() {
 223                 return $this->thumbScriptUrl;
 224         }
 225
 226         /**
 227          * Get the URL corresponding to one of the four basic zones
 228          * @param $zone String: one of: public, deleted, temp, thumb
 229          * @return String or false
 230          */
 231         function getZoneUrl( $zone ) {
 232                 return false;
 233         }
 234
 235         /**
 236          * Returns true if the repository can transform files via a 404 handler
 237          *
 238          * @return bool
 239          */
 240         function canTransformVia404() {
 241                 return $this->transformVia404;
 242         }
 243
 244         /**
 245          * Get the name of an image from its title object
 246          * @param $title Title
 247          */
 248         function getNameFromTitle( Title $title ) {
 249                 if ( $this->initialCapital != MWNamespace::isCapitalized( NS_FILE ) ) {
 250                         global $wgContLang;
 251                         $name = $title->getUserCaseDBKey();
 252                         if ( $this->initialCapital ) {
 253                                 $name = $wgContLang->ucfirst( $name );
 254                         }
 255                 } else {
 256                         $name = $title->getDBkey();
 257                 }
 258                 return $name;
 259         }
 260
 261         /**
 262          * @param $name
 263          * @param $levels
 264          * @return string
 265          */
 266         static function getHashPathForLevel( $name, $levels ) {
 267                 if ( $levels == 0 ) {
 268                         return '';
 269                 } else {
 270                         $hash = md5( $name );
 271                         $path = '';
 272                         for ( $i = 1; $i <= $levels; $i++ ) {
 273                                 $path .= substr( $hash, 0, $i ) . '/';
 274                         }
 275                         return $path;
 276                 }
 277         }
 278
 279         /**
 280          * Get the number of hash directory levels
 281          *
 282          * @return integer
 283          */
 284         function getHashLevels() {
 285                 return $this->hashLevels;
 286         }
 287
 288         /**
 289          * Get a relative path including trailing slash, e.g. f/fa/
 290          * If the repo is not hashed, returns an empty string
 291          *
 292          * @param $name string
 293          *
 294          * @return string
 295          */
 296         function getHashPath( $name ) {
 297                 return self::getHashPathForLevel( $name, $this->hashLevels );
 298         }
 299
 300         /**
 301          * Get the name of this repository, as specified by $info['name]' to the constructor
 302          */
 303         function getName() {
 304                 return $this->name;
 305         }
 306
 307         /**
 308          * Make an url to this repo
 309          *
 310          * @param $query mixed Query string to append
 311          * @param $entry string Entry point; defaults to index
 312          * @return string
 313          */
 314         function makeUrl( $query = '', $entry = 'index' ) {
 315                 $ext = isset( $this->scriptExtension ) ? $this->scriptExtension : '.php';
 316                 return wfAppendQuery( "{$this->scriptDirUrl}/{$entry}{$ext}", $query );
 317         }
 318
 319         /**
 320          * Get the URL of an image description page. May return false if it is
 321          * unknown or not applicable. In general this should only be called by the
 322          * File class, since it may return invalid results for certain kinds of
 323          * repositories. Use File::getDescriptionUrl() in user code.
 324          *
 325          * In particular, it uses the article paths as specified to the repository
 326          * constructor, whereas local repositories use the local Title functions.
 327          */
 328         function getDescriptionUrl( $name ) {
 329                 $encName = wfUrlencode( $name );
 330                 if ( !is_null( $this->descBaseUrl ) ) {
 331                         # "http://example.com/wiki/Image:"
 332                         return $this->descBaseUrl . $encName;
 333                 }
 334                 if ( !is_null( $this->articleUrl ) ) {
 335                         # "http://example.com/wiki/$1"
 336                         #
 337                         # We use "Image:" as the canonical namespace for
 338                         # compatibility across all MediaWiki versions.
 339                         return str_replace( '$1',
 340                                 "Image:$encName", $this->articleUrl );
 341                 }
 342                 if ( !is_null( $this->scriptDirUrl ) ) {
 343                         # "http://example.com/w"
 344                         #
 345                         # We use "Image:" as the canonical namespace for
 346                         # compatibility across all MediaWiki versions,
 347                         # and just sort of hope index.php is right. ;)
 348                         return $this->makeUrl( "title=Image:$encName" );
 349                 }
 350                 return false;
 351         }
 352
 353         /**
 354          * Get the URL of the content-only fragment of the description page. For
 355          * MediaWiki this means action=render. This should only be called by the
 356          * repository's file class, since it may return invalid results. User code
 357          * should use File::getDescriptionText().
 358          * @param $name String: name of image to fetch
 359          * @param $lang String: language to fetch it in, if any.
 360          */
 361         function getDescriptionRenderUrl( $name, $lang = null ) {
 362                 $query = 'action=render';
 363                 if ( !is_null( $lang ) ) {
 364                         $query .= '&uselang=' . $lang;
 365                 }
 366                 if ( isset( $this->scriptDirUrl ) ) {
 367                         return $this->makeUrl(
 368                                 'title=' .
 369                                 wfUrlencode( 'Image:' . $name ) .
 370                                 "&$query" );
 371                 } else {
 372                         $descUrl = $this->getDescriptionUrl( $name );
 373                         if ( $descUrl ) {
 374                                 return wfAppendQuery( $descUrl, $query );
 375                         } else {
 376                                 return false;
 377                         }
 378                 }
 379         }
 380
 381         /**
 382          * Get the URL of the stylesheet to apply to description pages
 383          * @return string
 384          */
 385         function getDescriptionStylesheetUrl() {
 386                 if ( $this->scriptDirUrl ) {
 387                         return $this->makeUrl( 'title=MediaWiki:Filepage.css&' .
 388                                 wfArrayToCGI( Skin::getDynamicStylesheetQuery() ) );
 389                 }
 390         }
 391
 392         /**
 393          * Store a file to a given destination.
 394          *
 395          * @param $srcPath String: source path or virtual URL
 396          * @param $dstZone String: destination zone
 397          * @param $dstRel String: destination relative path
 398          * @param $flags Integer: bitwise combination of the following flags:
 399          *     self::DELETE_SOURCE     Delete the source file after upload
 400          *     self::OVERWRITE         Overwrite an existing destination file instead of failing
 401          *     self::OVERWRITE_SAME    Overwrite the file if the destination exists and has the
 402          *                             same contents as the source
 403          * @return FileRepoStatus
 404          */
 405         function store( $srcPath, $dstZone, $dstRel, $flags = 0 ) {
 406                 $status = $this->storeBatch( array( array( $srcPath, $dstZone, $dstRel ) ), $flags );
 407                 if ( $status->successCount == 0 ) {
 408                         $status->ok = false;
 409                 }
 410                 return $status;
 411         }
 412
 413         /**
 414          * Store a batch of files
 415          *
 416          * @param $triplets Array: (src,zone,dest) triplets as per store()
 417          * @param $flags Integer: flags as per store
 418          */
 419         abstract function storeBatch( $triplets, $flags = 0 );
 420
 421         /**
 422          * Pick a random name in the temp zone and store a file to it.
 423          * Returns a FileRepoStatus object with the URL in the value.
 424          *
 425          * @param $originalName String: the base name of the file as specified
 426          *     by the user. The file extension will be maintained.
 427          * @param $srcPath String: the current location of the file.
 428          */
 429         abstract function storeTemp( $originalName, $srcPath );
 430
 431
 432         /**
 433          * Concatenate and array of file sources.
 434          * @param $fileList Array of file sources
 435          * @param $targetPath String target destination for file.
 436          * @throws MWException
 437          */
 438         abstract function concatenate( $fileList, $targetPath, $flags = 0 );
 439
 440         /**
 441          * Append the contents of the source path to the given file, OR queue
 442          * the appending operation in anticipation of a later appendFinish() call.
 443          * @param $srcPath String: location of the source file
 444          * @param $toAppendPath String: path to append to.
 445          * @param $flags Integer: bitfield, may be FileRepo::DELETE_SOURCE to indicate
 446          *        that the source file should be deleted if possible
 447          * @return mixed Status or false
 448          */
 449         abstract function append( $srcPath, $toAppendPath, $flags = 0 );
 450
 451         /**
 452          * Finish the append operation.
 453          * @param $toAppendPath String: path to append to.
 454          * @return mixed Status or false
 455          */
 456         abstract function appendFinish( $toAppendPath );
 457
 458         /**
 459          * Remove a temporary file or mark it for garbage collection
 460          * @param $virtualUrl String: the virtual URL returned by storeTemp
 461          * @return Boolean: true on success, false on failure
 462          * STUB
 463          */
 464         function freeTemp( $virtualUrl ) {
 465                 return true;
 466         }
 467
 468         /**
 469          * Copy or move a file either from the local filesystem or from an mwrepo://
 470          * virtual URL, into this repository at the specified destination location.
 471          *
 472          * Returns a FileRepoStatus object. On success, the value contains "new" or
 473          * "archived", to indicate whether the file was new with that name.
 474          *
 475          * @param $srcPath String: the source path or URL
 476          * @param $dstRel String: the destination relative path
 477          * @param $archiveRel String: the relative path where the existing file is to
 478          *        be archived, if there is one. Relative to the public zone root.
 479          * @param $flags Integer: bitfield, may be FileRepo::DELETE_SOURCE to indicate
 480          *        that the source file should be deleted if possible
 481          */
 482         function publish( $srcPath, $dstRel, $archiveRel, $flags = 0 ) {
 483                 $status = $this->publishBatch( array( array( $srcPath, $dstRel, $archiveRel ) ), $flags );
 484                 if ( $status->successCount == 0 ) {
 485                         $status->ok = false;
 486                 }
 487                 if ( isset( $status->value[0] ) ) {
 488                         $status->value = $status->value[0];
 489                 } else {
 490                         $status->value = false;
 491                 }
 492                 return $status;
 493         }
 494
 495         /**
 496          * Publish a batch of files
 497          * @param $triplets Array: (source,dest,archive) triplets as per publish()
 498          * @param $flags Integer: bitfield, may be FileRepo::DELETE_SOURCE to indicate
 499          *        that the source files should be deleted if possible
 500          */
 501         abstract function publishBatch( $triplets, $flags = 0 );
 502
 503         /**
 504          * @param $file
 505          * @param int $flags
 506          * @return bool
 507          */
 508         function fileExists( $file, $flags = 0 ) {
 509                 $result = $this->fileExistsBatch( array( $file ), $flags );
 510                 return $result[0];
 511         }
 512
 513         /**
 514          * Checks existence of an array of files.
 515          *
 516          * @param $files Array: URLs (or paths) of files to check
 517          * @param $flags Integer: bitwise combination of the following flags:
 518          *     self::FILES_ONLY     Mark file as existing only if it is a file (not directory)
 519          * @return Either array of files and existence flags, or false
 520          */
 521         abstract function fileExistsBatch( $files, $flags = 0 );
 522
 523         /**
 524          * Move a group of files to the deletion archive.
 525          *
 526          * If no valid deletion archive is configured, this may either delete the
 527          * file or throw an exception, depending on the preference of the repository.
 528          *
 529          * The overwrite policy is determined by the repository -- currently FSRepo
 530          * assumes a naming scheme in the deleted zone based on content hash, as
 531          * opposed to the public zone which is assumed to be unique.
 532          *
 533          * @param $sourceDestPairs Array of source/destination pairs. Each element
 534          *        is a two-element array containing the source file path relative to the
 535          *        public root in the first element, and the archive file path relative
 536          *        to the deleted zone root in the second element.
 537          * @return FileRepoStatus
 538          */
 539         abstract function deleteBatch( $sourceDestPairs );
 540
 541         /**
 542          * Move a file to the deletion archive.
 543          * If no valid deletion archive exists, this may either delete the file
 544          * or throw an exception, depending on the preference of the repository
 545          * @param $srcRel Mixed: relative path for the file to be deleted
 546          * @param $archiveRel Mixed: relative path for the archive location.
 547          *        Relative to a private archive directory.
 548          * @return FileRepoStatus object
 549          */
 550         function delete( $srcRel, $archiveRel ) {
 551                 return $this->deleteBatch( array( array( $srcRel, $archiveRel ) ) );
 552         }
 553
 554         /**
 555          * Get properties of a file with a given virtual URL
 556          * The virtual URL must refer to this repo
 557          * Properties should ultimately be obtained via File::getPropsFromPath()
 558          *
 559          * @param $virtualUrl string
 560          */
 561         abstract function getFileProps( $virtualUrl );
 562
 563         /**
 564          * Call a callback function for every file in the repository
 565          * May use either the database or the filesystem
 566          * STUB
 567          */
 568         function enumFiles( $callback ) {
 569                 throw new MWException( 'enumFiles is not supported by ' . get_class( $this ) );
 570         }
 571
 572         /**
 573          * Determine if a relative path is valid, i.e. not blank or involving directory traveral
 574          *
 575          * @param $filename string
 576          *
 577          * @return bool
 578          */
 579         function validateFilename( $filename ) {
 580                 if ( strval( $filename ) == '' ) {
 581                         return false;
 582                 }
 583                 if ( wfIsWindows() ) {
 584                         $filename = strtr( $filename, '\\', '/' );
 585                 }
 586                 /**
 587                  * Use the same traversal protection as Title::secureAndSplit()
 588                  */
 589                 if ( strpos( $filename, '.' ) !== false &&
 590                         ( $filename === '.' || $filename === '..' ||
 591                                 strpos( $filename, './' ) === 0  ||
 592                                 strpos( $filename, '../' ) === 0 ||
 593                                 strpos( $filename, '/./' ) !== false ||
 594                                 strpos( $filename, '/../' ) !== false ) )
 595                 {
 596                         return false;
 597                 } else {
 598                         return true;
 599                 }
 600         }
 601
 602         /**#@+
 603          * Path disclosure protection functions
 604          */
 605         function paranoidClean( $param ) { return '[hidden]'; }
 606
 607         /**
 608          * @param $param
 609          * @return
 610          */
 611         function passThrough( $param ) { return $param; }
 612
 613         /**
 614          * Get a callback function to use for cleaning error message parameters
 615          */
 616         function getErrorCleanupFunction() {
 617                 switch ( $this->pathDisclosureProtection ) {
 618                         case 'none':
 619                                 $callback = array( $this, 'passThrough' );
 620                                 break;
 621                         default: // 'paranoid'
 622                                 $callback = array( $this, 'paranoidClean' );
 623                 }
 624                 return $callback;
 625         }
 626         /**#@-*/
 627
 628         /**
 629          * Create a new fatal error
 630          */
 631         function newFatal( $message /*, parameters...*/ ) {
 632                 $params = func_get_args();
 633                 array_unshift( $params, $this );
 634                 return MWInit::callStaticMethod( 'FileRepoStatus', 'newFatal', $params );
 635         }
 636
 637         /**
 638          * Create a new good result
 639          *
 640          * @return FileRepoStatus
 641          */
 642         function newGood( $value = null ) {
 643                 return FileRepoStatus::newGood( $this, $value );
 644         }
 645
 646         /**
 647          * Delete files in the deleted directory if they are not referenced in the filearchive table
 648          * STUB
 649          */
 650         function cleanupDeletedBatch( $storageKeys ) {}
 651
 652         /**
 653          * Checks if there is a redirect named as $title. If there is, return the
 654          * title object. If not, return false.
 655          * STUB
 656          *
 657          * @param $title Title of image
 658          * @return Bool
 659          */
 660         function checkRedirect( Title $title ) {
 661                 return false;
 662         }
 663
 664         /**
 665          * Invalidates image redirect cache related to that image
 666          * Doesn't do anything for repositories that don't support image redirects.
 667          *
 668          * STUB
 669          * @param $title Title of image
 670          */
 671         function invalidateImageRedirect( Title $title ) {}
 672
 673         /**
 674          * Get an array or iterator of file objects for files that have a given
 675          * SHA-1 content hash.
 676          *
 677          * STUB
 678          */
 679         function findBySha1( $hash ) {
 680                 return array();
 681         }
 682
 683         /**
 684          * Get the human-readable name of the repo.
 685          * @return string
 686          */
 687         public function getDisplayName() {
 688                 // We don't name our own repo, return nothing
 689                 if ( $this->isLocal() ) {
 690                         return null;
 691                 }
 692                 // 'shared-repo-name-wikimediacommons' is used when $wgUseInstantCommons = true
 693                 return wfMessageFallback( 'shared-repo-name-' . $this->name, 'shared-repo' )->text();
 694         }
 695
 696         /**
 697          * Returns true if this the local file repository.
 698          *
 699          * @return bool
 700          */
 701         function isLocal() {
 702                 return $this->getName() == 'local';
 703         }
 704
 705         /**
 706          * Get a key on the primary cache for this repository.
 707          * Returns false if the repository's cache is not accessible at this site.
 708          * The parameters are the parts of the key, as for wfMemcKey().
 709          *
 710          * STUB
 711          */
 712         function getSharedCacheKey( /*...*/ ) {
 713                 return false;
 714         }
 715
 716         /**
 717          * Get a key for this repo in the local cache domain. These cache keys are
 718          * not shared with remote instances of the repo.
 719          * The parameters are the parts of the key, as for wfMemcKey().
 720          */
 721         function getLocalCacheKey( /*...*/ ) {
 722                 $args = func_get_args();
 723                 array_unshift( $args, 'filerepo', $this->getName() );
 724                 return call_user_func_array( 'wfMemcKey', $args );
 725         }
 726
 727         /**
 728          * Get an UploadStash associated with this repo.
 729          *
 730          * @return UploadStash
 731          */
 732         function getUploadStash() {
 733                 return new UploadStash( $this );
 734         }
 735 }