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
  21         var $thumbScriptUrl, $transformVia404;
  22         var $descBaseUrl, $scriptDirUrl, $scriptExtension, $articleUrl;
  23         var $fetchDescription, $initialCapital;
  24         var $pathDisclosureProtection = 'paranoid';
  25         var $descriptionCacheExpiry, $hashLevels, $url, $thumbUrl;
  26
  27         /**
  28          * Factory functions for creating new files
  29          * Override these in the base class
  30          */
  31         var $fileFactory = false, $oldFileFactory = false;
  32         var $fileFactoryKey = false, $oldFileFactoryKey = false;
  33
  34         function __construct( $info ) {
  35                 // Required settings
  36                 $this->name = $info['name'];
  37
  38                 // Optional settings
  39                 $this->initialCapital = MWNamespace::isCapitalized( NS_FILE );
  40                 foreach ( array( 'descBaseUrl', 'scriptDirUrl', 'articleUrl', 'fetchDescription',
  41                         'thumbScriptUrl', 'initialCapital', 'pathDisclosureProtection',
  42                         'descriptionCacheExpiry', 'hashLevels', 'url', 'thumbUrl', 'scriptExtension' )
  43                         as $var )
  44                 {
  45                         if ( isset( $info[$var] ) ) {
  46                                 $this->$var = $info[$var];
  47                         }
  48                 }
  49                 $this->transformVia404 = !empty( $info['transformVia404'] );
  50         }
  51
  52         /**
  53          * Determine if a string is an mwrepo:// URL
  54          */
  55         static function isVirtualUrl( $url ) {
  56                 return substr( $url, 0, 9 ) == 'mwrepo://';
  57         }
  58
  59         /**
  60          * Create a new File object from the local repository
  61          *
  62          * @param $title Mixed: Title object or string
  63          * @param $time Mixed: Time at which the image was uploaded.
  64          *              If this is specified, the returned object will be an
  65          *              instance of the repository's old file class instead of a
  66          *              current file. Repositories not supporting version control
  67          *              should return false if this parameter is set.
  68          */
  69         function newFile( $title, $time = false ) {
  70                 if ( !($title instanceof Title) ) {
  71                         $title = Title::makeTitleSafe( NS_FILE, $title );
  72                         if ( !is_object( $title ) ) {
  73                                 return null;
  74                         }
  75                 }
  76                 if ( $time ) {
  77                         if ( $this->oldFileFactory ) {
  78                                 return call_user_func( $this->oldFileFactory, $title, $this, $time );
  79                         } else {
  80                                 return false;
  81                         }
  82                 } else {
  83                         return call_user_func( $this->fileFactory, $title, $this );
  84                 }
  85         }
  86
  87         /**
  88          * Find an instance of the named file created at the specified time
  89          * Returns false if the file does not exist. Repositories not supporting
  90          * version control should return false if the time is specified.
  91          *
  92          * @param $title Mixed: Title object or string
  93          * @param $options Associative array of options:
  94          *     time:           requested time for an archived image, or false for the
  95          *                     current version. An image object will be returned which was
  96          *                     created at the specified time.
  97          *
  98          *     ignoreRedirect: If true, do not follow file redirects
  99          *
 100          *     private:        If true, return restricted (deleted) files if the current
 101          *                     user is allowed to view them. Otherwise, such files will not
 102          *                     be found.
 103          */
 104         function findFile( $title, $options = array() ) {
 105                 if ( !is_array( $options ) ) {
 106                         // MW 1.15 compat
 107                         $time = $options;
 108                 } else {
 109                         $time = isset( $options['time'] ) ? $options['time'] : false;
 110                 }
 111                 if ( !($title instanceof Title) ) {
 112                         $title = Title::makeTitleSafe( NS_FILE, $title );
 113                         if ( !is_object( $title ) ) {
 114                                 return false;
 115                         }
 116                 }
 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;
 131                                 } else if ( !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 && $redir->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         function findFiles( $items ) {
 165                 $result = array();
 166                 foreach ( $items as $index => $item ) {
 167                         if ( is_array( $item ) ) {
 168                                 $title = $item['title'];
 169                                 $options = $item;
 170                                 unset( $options['title'] );
 171                         } else {
 172                                 $title = $item;
 173                                 $options = array();
 174                         }
 175                         $file = $this->findFile( $title, $options );
 176                         if ( $file )
 177                                 $result[$file->getTitle()->getDBkey()] = $file;
 178                 }
 179                 return $result;
 180         }
 181
 182         /**
 183          * Create a new File object from the local repository
 184          * @param $sha1 Mixed: SHA-1 key
 185          * @param $time Mixed: time at which the image was uploaded.
 186          *              If this is specified, the returned object will be an
 187          *              of the repository's old file class instead of a current
 188          *              file. Repositories not supporting version control should
 189          *              return false if this parameter is set.
 190          */
 191         function newFileFromKey( $sha1, $time = false ) {
 192                 if ( $time ) {
 193                         if ( $this->oldFileFactoryKey ) {
 194                                 return call_user_func( $this->oldFileFactoryKey, $sha1, $this, $time );
 195                         } else {
 196                                 return false;
 197                         }
 198                 } else {
 199                         return call_user_func( $this->fileFactoryKey, $sha1, $this );
 200                 }
 201         }
 202
 203         /**
 204          * Find an instance of the file with this key, created at the specified time
 205          * Returns false if the file does not exist. Repositories not supporting
 206          * version control should return false if the time is specified.
 207          *
 208          * @param $sha1 String
 209          * @param $options Option array, same as findFile().
 210          */
 211         function findFileFromKey( $sha1, $options = array() ) {
 212                 if ( !is_array( $options ) ) {
 213                         # MW 1.15 compat
 214                         $time = $options;
 215                 } else {
 216                         $time = isset( $options['time'] ) ? $options['time'] : false;
 217                 }
 218
 219                 # First try the current version of the file to see if it precedes the timestamp
 220                 $img = $this->newFileFromKey( $sha1 );
 221                 if ( !$img ) {
 222                         return false;
 223                 }
 224                 if ( $img->exists() && ( !$time || $img->getTimestamp() == $time ) ) {
 225                         return $img;
 226                 }
 227                 # Now try an old version of the file
 228                 if ( $time !== false ) {
 229                         $img = $this->newFileFromKey( $sha1, $time );
 230                         if ( $img->exists() ) {
 231                                 if ( !$img->isDeleted(File::DELETED_FILE) ) {
 232                                         return $img;
 233                                 } else if ( !empty( $options['private'] ) && $img->userCan(File::DELETED_FILE) ) {
 234                                         return $img;
 235                                 }
 236                         }
 237                 }
 238                 return false;
 239         }
 240
 241         /**
 242          * Get the URL of thumb.php
 243          */
 244         function getThumbScriptUrl() {
 245                 return $this->thumbScriptUrl;
 246         }
 247
 248         /**
 249          * Get the URL corresponding to one of the four basic zones
 250          * @param $zone String: one of: public, deleted, temp, thumb
 251          * @return String or false
 252          */
 253         function getZoneUrl( $zone ) {
 254                 return false;
 255         }
 256
 257         /**
 258          * Returns true if the repository can transform files via a 404 handler
 259          */
 260         function canTransformVia404() {
 261                 return $this->transformVia404;
 262         }
 263
 264         /**
 265          * Get the name of an image from its title object
 266          */
 267         function getNameFromTitle( $title ) {
 268                 if ( $this->initialCapital != MWNamespace::isCapitalized( NS_FILE ) ) {
 269                         global $wgContLang;
 270                         $name = $title->getUserCaseDBKey();
 271                         if ( $this->initialCapital ) {
 272                                 $name = $wgContLang->ucfirst( $name );
 273                         }
 274                 } else {
 275                         $name = $title->getDBkey();
 276                 }
 277                 return $name;
 278         }
 279
 280         static function getHashPathForLevel( $name, $levels ) {
 281                 if ( $levels == 0 ) {
 282                         return '';
 283                 } else {
 284                         $hash = md5( $name );
 285                         $path = '';
 286                         for ( $i = 1; $i <= $levels; $i++ ) {
 287                                 $path .= substr( $hash, 0, $i ) . '/';
 288                         }
 289                         return $path;
 290                 }
 291         }
 292
 293         /**
 294          * Get a relative path including trailing slash, e.g. f/fa/
 295          * If the repo is not hashed, returns an empty string
 296          */
 297         function getHashPath( $name ) {
 298                 return self::getHashPathForLevel( $name, $this->hashLevels );
 299         }
 300
 301         /**
 302          * Get the name of this repository, as specified by $info['name]' to the constructor
 303          */
 304         function getName() {
 305                 return $this->name;
 306         }
 307
 308         /**
 309          * Make an url to this repo
 310          *
 311          * @param $query mixed Query string to append
 312          * @param $entry string Entry point; defaults to index
 313          * @return string
 314          */
 315         function makeUrl( $query = '', $entry = 'index' ) {
 316                 $ext = isset( $this->scriptExtension ) ? $this->scriptExtension : '.php';
 317                 return wfAppendQuery( "{$this->scriptDirUrl}/{$entry}{$ext}", $query );
 318         }
 319
 320         /**
 321          * Get the URL of an image description page. May return false if it is
 322          * unknown or not applicable. In general this should only be called by the
 323          * File class, since it may return invalid results for certain kinds of
 324          * repositories. Use File::getDescriptionUrl() in user code.
 325          *
 326          * In particular, it uses the article paths as specified to the repository
 327          * constructor, whereas local repositories use the local Title functions.
 328          */
 329         function getDescriptionUrl( $name ) {
 330                 $encName = wfUrlencode( $name );
 331                 if ( !is_null( $this->descBaseUrl ) ) {
 332                         # "http://example.com/wiki/Image:"
 333                         return $this->descBaseUrl . $encName;
 334                 }
 335                 if ( !is_null( $this->articleUrl ) ) {
 336                         # "http://example.com/wiki/$1"
 337                         #
 338                         # We use "Image:" as the canonical namespace for
 339                         # compatibility across all MediaWiki versions.
 340                         return str_replace( '$1',
 341                                 "Image:$encName", $this->articleUrl );
 342                 }
 343                 if ( !is_null( $this->scriptDirUrl ) ) {
 344                         # "http://example.com/w"
 345                         #
 346                         # We use "Image:" as the canonical namespace for
 347                         # compatibility across all MediaWiki versions,
 348                         # and just sort of hope index.php is right. ;)
 349                         return $this->makeUrl( "title=Image:$encName" );
 350                 }
 351                 return false;
 352         }
 353
 354         /**
 355          * Get the URL of the content-only fragment of the description page. For
 356          * MediaWiki this means action=render. This should only be called by the
 357          * repository's file class, since it may return invalid results. User code
 358          * should use File::getDescriptionText().
 359          * @param $name String: name of image to fetch
 360          * @param $lang String: language to fetch it in, if any.
 361          */
 362         function getDescriptionRenderUrl( $name, $lang = null ) {
 363                 $query = 'action=render';
 364                 if ( !is_null( $lang ) ) {
 365                         $query .= '&uselang=' . $lang;
 366                 }
 367                 if ( isset( $this->scriptDirUrl ) ) {
 368                         return $this->makeUrl(
 369                                 'title=' .
 370                                 wfUrlencode( 'Image:' . $name ) .
 371                                 "&$query" );
 372                 } else {
 373                         $descUrl = $this->getDescriptionUrl( $name );
 374                         if ( $descUrl ) {
 375                                 return wfAppendQuery( $descUrl, $query );
 376                         } else {
 377                                 return false;
 378                         }
 379                 }
 380         }
 381
 382         /**
 383          * Get the URL of the stylesheet to apply to description pages
 384          * @return string
 385          */
 386         function getDescriptionStylesheetUrl() {
 387                 if ( $this->scriptDirUrl ) {
 388                         return $this->makeUrl( 'title=MediaWiki:Filepage.css&' .
 389                                 wfArrayToCGI( Skin::getDynamicStylesheetQuery() ) );
 390                 }
 391         }
 392
 393         /**
 394          * Store a file to a given destination.
 395          *
 396          * @param $srcPath String: source path or virtual URL
 397          * @param $dstZone String: destination zone
 398          * @param $dstRel String: destination relative path
 399          * @param $flags Integer: bitwise combination of the following flags:
 400          *     self::DELETE_SOURCE     Delete the source file after upload
 401          *     self::OVERWRITE         Overwrite an existing destination file instead of failing
 402          *     self::OVERWRITE_SAME    Overwrite the file if the destination exists and has the
 403          *                             same contents as the source
 404          * @return FileRepoStatus
 405          */
 406         function store( $srcPath, $dstZone, $dstRel, $flags = 0 ) {
 407                 $status = $this->storeBatch( array( array( $srcPath, $dstZone, $dstRel ) ), $flags );
 408                 if ( $status->successCount == 0 ) {
 409                         $status->ok = false;
 410                 }
 411                 return $status;
 412         }
 413
 414         /**
 415          * Store a batch of files
 416          *
 417          * @param $triplets Array: (src,zone,dest) triplets as per store()
 418          * @param $flags Integer: flags as per store
 419          */
 420         abstract function storeBatch( $triplets, $flags = 0 );
 421
 422         /**
 423          * Pick a random name in the temp zone and store a file to it.
 424          * Returns a FileRepoStatus object with the URL in the value.
 425          *
 426          * @param $originalName String: the base name of the file as specified
 427          *     by the user. The file extension will be maintained.
 428          * @param $srcPath String: the current location of the file.
 429          */
 430         abstract function storeTemp( $originalName, $srcPath );
 431
 432
 433         /**
 434          * Append the contents of the source path to the given file.
 435          * @param $srcPath String: location of the source file
 436          * @param $toAppendPath String: path to append to.
 437          * @param $flags Integer: bitfield, may be FileRepo::DELETE_SOURCE to indicate
 438          *        that the source file should be deleted if possible
 439          * @return mixed Status or false
 440          */
 441         abstract function append( $srcPath, $toAppendPath, $flags = 0 );
 442
 443         /**
 444          * Remove a temporary file or mark it for garbage collection
 445          * @param $virtualUrl String: the virtual URL returned by storeTemp
 446          * @return Boolean: true on success, false on failure
 447          * STUB
 448          */
 449         function freeTemp( $virtualUrl ) {
 450                 return true;
 451         }
 452
 453         /**
 454          * Copy or move a file either from the local filesystem or from an mwrepo://
 455          * virtual URL, into this repository at the specified destination location.
 456          *
 457          * Returns a FileRepoStatus object. On success, the value contains "new" or
 458          * "archived", to indicate whether the file was new with that name.
 459          *
 460          * @param $srcPath String: the source path or URL
 461          * @param $dstRel String: the destination relative path
 462          * @param $archiveRel String: rhe relative path where the existing file is to
 463          *        be archived, if there is one. Relative to the public zone root.
 464          * @param $flags Integer: bitfield, may be FileRepo::DELETE_SOURCE to indicate
 465          *        that the source file should be deleted if possible
 466          */
 467         function publish( $srcPath, $dstRel, $archiveRel, $flags = 0 ) {
 468                 $status = $this->publishBatch( array( array( $srcPath, $dstRel, $archiveRel ) ), $flags );
 469                 if ( $status->successCount == 0 ) {
 470                         $status->ok = false;
 471                 }
 472                 if ( isset( $status->value[0] ) ) {
 473                         $status->value = $status->value[0];
 474                 } else {
 475                         $status->value = false;
 476                 }
 477                 return $status;
 478         }
 479
 480         /**
 481          * Publish a batch of files
 482          * @param $triplets Array: (source,dest,archive) triplets as per publish()
 483          * @param $flags Integer: bitfield, may be FileRepo::DELETE_SOURCE to indicate
 484          *        that the source files should be deleted if possible
 485          */
 486         abstract function publishBatch( $triplets, $flags = 0 );
 487
 488         function fileExists( $file, $flags = 0 ) {
 489                 $result = $this->fileExistsBatch( array( $file ), $flags );
 490                 return $result[0];
 491         }
 492
 493         /**
 494          * Checks existence of an array of files.
 495          *
 496          * @param $files Array: URLs (or paths) of files to check
 497          * @param $flags Integer: bitwise combination of the following flags:
 498          *     self::FILES_ONLY     Mark file as existing only if it is a file (not directory)
 499          * @return Either array of files and existence flags, or false
 500          */
 501         abstract function fileExistsBatch( $files, $flags = 0 );
 502
 503         /**
 504          * Move a group of files to the deletion archive.
 505          *
 506          * If no valid deletion archive is configured, this may either delete the
 507          * file or throw an exception, depending on the preference of the repository.
 508          *
 509          * The overwrite policy is determined by the repository -- currently FSRepo
 510          * assumes a naming scheme in the deleted zone based on content hash, as
 511          * opposed to the public zone which is assumed to be unique.
 512          *
 513          * @param $sourceDestPairs Array of source/destination pairs. Each element
 514          *        is a two-element array containing the source file path relative to the
 515          *        public root in the first element, and the archive file path relative
 516          *        to the deleted zone root in the second element.
 517          * @return FileRepoStatus
 518          */
 519         abstract function deleteBatch( $sourceDestPairs );
 520
 521         /**
 522          * Move a file to the deletion archive.
 523          * If no valid deletion archive exists, this may either delete the file
 524          * or throw an exception, depending on the preference of the repository
 525          * @param $srcRel Mixed: relative path for the file to be deleted
 526          * @param $archiveRel Mixed: relative path for the archive location.
 527          *        Relative to a private archive directory.
 528          * @return FileRepoStatus object
 529          */
 530         function delete( $srcRel, $archiveRel ) {
 531                 return $this->deleteBatch( array( array( $srcRel, $archiveRel ) ) );
 532         }
 533
 534         /**
 535          * Get properties of a file with a given virtual URL
 536          * The virtual URL must refer to this repo
 537          * Properties should ultimately be obtained via File::getPropsFromPath()
 538          */
 539         abstract function getFileProps( $virtualUrl );
 540
 541         /**
 542          * Call a callback function for every file in the repository
 543          * May use either the database or the filesystem
 544          * STUB
 545          */
 546         function enumFiles( $callback ) {
 547                 throw new MWException( 'enumFiles is not supported by ' . get_class( $this ) );
 548         }
 549
 550         /**
 551          * Determine if a relative path is valid, i.e. not blank or involving directory traveral
 552          */
 553         function validateFilename( $filename ) {
 554                 if ( strval( $filename ) == '' ) {
 555                         return false;
 556                 }
 557                 if ( wfIsWindows() ) {
 558                         $filename = strtr( $filename, '\\', '/' );
 559                 }
 560                 /**
 561                  * Use the same traversal protection as Title::secureAndSplit()
 562                  */
 563                 if ( strpos( $filename, '.' ) !== false &&
 564                      ( $filename === '.' || $filename === '..' ||
 565                        strpos( $filename, './' ) === 0  ||
 566                        strpos( $filename, '../' ) === 0 ||
 567                        strpos( $filename, '/./' ) !== false ||
 568                        strpos( $filename, '/../' ) !== false ) )
 569                 {
 570                         return false;
 571                 } else {
 572                         return true;
 573                 }
 574         }
 575
 576         /**#@+
 577          * Path disclosure protection functions
 578          */
 579         function paranoidClean( $param ) { return '[hidden]'; }
 580         function passThrough( $param ) { return $param; }
 581
 582         /**
 583          * Get a callback function to use for cleaning error message parameters
 584          */
 585         function getErrorCleanupFunction() {
 586                 switch ( $this->pathDisclosureProtection ) {
 587                         case 'none':
 588                                 $callback = array( $this, 'passThrough' );
 589                                 break;
 590                         default: // 'paranoid'
 591                                 $callback = array( $this, 'paranoidClean' );
 592                 }
 593                 return $callback;
 594         }
 595         /**#@-*/
 596
 597         /**
 598          * Create a new fatal error
 599          */
 600         function newFatal( $message /*, parameters...*/ ) {
 601                 $params = func_get_args();
 602                 array_unshift( $params, $this );
 603                 return call_user_func_array( array( 'FileRepoStatus', 'newFatal' ), $params );
 604         }
 605
 606         /**
 607          * Create a new good result
 608          */
 609         function newGood( $value = null ) {
 610                 return FileRepoStatus::newGood( $this, $value );
 611         }
 612
 613         /**
 614          * Delete files in the deleted directory if they are not referenced in the filearchive table
 615          * STUB
 616          */
 617         function cleanupDeletedBatch( $storageKeys ) {}
 618
 619         /**
 620          * Checks if there is a redirect named as $title. If there is, return the
 621          * title object. If not, return false.
 622          * STUB
 623          *
 624          * @param $title Title of image
 625          */
 626         function checkRedirect( $title ) {
 627                 return false;
 628         }
 629
 630         /**
 631          * Invalidates image redirect cache related to that image
 632          * Doesn't do anything for repositories that don't support image redirects.
 633          *
 634          * STUB
 635          * @param $title Title of image
 636          */
 637         function invalidateImageRedirect( $title ) {}
 638
 639         /**
 640          * Get an array or iterator of file objects for files that have a given
 641          * SHA-1 content hash.
 642          *
 643          * STUB
 644          */
 645         function findBySha1( $hash ) {
 646                 return array();
 647         }
 648
 649         /**
 650          * Get the human-readable name of the repo.
 651          * @return string
 652          */
 653         public function getDisplayName() {
 654                 // We don't name our own repo, return nothing
 655                 if ( $this->isLocal() ) {
 656                         return null;
 657                 }
 658                 // 'shared-repo-name-wikimediacommons' is used when $wgUseInstantCommons = true
 659                 $repoName = wfMsg( 'shared-repo-name-' . $this->name );
 660                 if ( !wfEmptyMsg( 'shared-repo-name-' . $this->name, $repoName ) ) {
 661                         return $repoName;
 662                 }
 663                 return wfMsg( 'shared-repo' );
 664         }
 665
 666         /**
 667          * Returns true if this the local file repository.
 668          *
 669          * @return bool
 670          */
 671         function isLocal() {
 672                 return $this->getName() == 'local';
 673         }
 674
 675
 676         /**
 677          * Get a key on the primary cache for this repository.
 678          * Returns false if the repository's cache is not accessible at this site.
 679          * The parameters are the parts of the key, as for wfMemcKey().
 680          *
 681          * STUB
 682          */
 683         function getSharedCacheKey( /*...*/ ) {
 684                 return false;
 685         }
 686
 687         /**
 688          * Get a key for this repo in the local cache domain. These cache keys are
 689          * not shared with remote instances of the repo.
 690          * The parameters are the parts of the key, as for wfMemcKey().
 691          */
 692         function getLocalCacheKey( /*...*/ ) {
 693                 $args = func_get_args();
 694                 array_unshift( $args, 'filerepo', $this->getName() );
 695                 return call_user_func_array( 'wfMemcKey', $args );
 696         }
 697 }