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 $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                 }
 180                 return $result;
 181         }
 182
 183         /**
 184          * Create a new File object from the local repository
 185          * @param $sha1 Mixed: SHA-1 key
 186          * @param $time Mixed: time at which the image was uploaded.
 187          *              If this is specified, the returned object will be an
 188          *              of the repository's old file class instead of a current
 189          *              file. Repositories not supporting version control should
 190          *              return false if this parameter is set.
 191          */
 192         function newFileFromKey( $sha1, $time = false ) {
 193                 if ( $time ) {
 194                         if ( $this->oldFileFactoryKey ) {
 195                                 return call_user_func( $this->oldFileFactoryKey, $sha1, $this, $time );
 196                         } else {
 197                                 return false;
 198                         }
 199                 } else {
 200                         return call_user_func( $this->fileFactoryKey, $sha1, $this );
 201                 }
 202         }
 203
 204         /**
 205          * Find an instance of the file with this key, created at the specified time
 206          * Returns false if the file does not exist. Repositories not supporting
 207          * version control should return false if the time is specified.
 208          *
 209          * @param $sha1 String
 210          * @param $options Option array, same as findFile().
 211          */
 212         function findFileFromKey( $sha1, $options = array() ) {
 213                 if ( !is_array( $options ) ) {
 214                         # MW 1.15 compat
 215                         $time = $options;
 216                 } else {
 217                         $time = isset( $options['time'] ) ? $options['time'] : false;
 218                 }
 219
 220                 # First try the current version of the file to see if it precedes the timestamp
 221                 $img = $this->newFileFromKey( $sha1 );
 222                 if ( !$img ) {
 223                         return false;
 224                 }
 225                 if ( $img->exists() && ( !$time || $img->getTimestamp() == $time ) ) {
 226                         return $img;
 227                 }
 228                 # Now try an old version of the file
 229                 if ( $time !== false ) {
 230                         $img = $this->newFileFromKey( $sha1, $time );
 231                         if ( $img->exists() ) {
 232                                 if ( !$img->isDeleted(File::DELETED_FILE) ) {
 233                                         return $img;
 234                                 } else if ( !empty( $options['private'] ) && $img->userCan(File::DELETED_FILE) ) {
 235                                         return $img;
 236                                 }
 237                         }
 238                 }
 239                 return false;
 240         }
 241
 242         /**
 243          * Get the URL of thumb.php
 244          */
 245         function getThumbScriptUrl() {
 246                 return $this->thumbScriptUrl;
 247         }
 248
 249         /**
 250          * Get the URL corresponding to one of the four basic zones
 251          * @param $zone String: one of: public, deleted, temp, thumb
 252          * @return String or false
 253          */
 254         function getZoneUrl( $zone ) {
 255                 return false;
 256         }
 257
 258         /**
 259          * Returns true if the repository can transform files via a 404 handler
 260          */
 261         function canTransformVia404() {
 262                 return $this->transformVia404;
 263         }
 264
 265         /**
 266          * Get the name of an image from its title object
 267          */
 268         function getNameFromTitle( $title ) {
 269                 if ( $this->initialCapital != MWNamespace::isCapitalized( NS_FILE ) ) {
 270                         global $wgContLang;
 271                         $name = $title->getUserCaseDBKey();
 272                         if ( $this->initialCapital ) {
 273                                 $name = $wgContLang->ucfirst( $name );
 274                         }
 275                 } else {
 276                         $name = $title->getDBkey();
 277                 }
 278                 return $name;
 279         }
 280
 281         static function getHashPathForLevel( $name, $levels ) {
 282                 if ( $levels == 0 ) {
 283                         return '';
 284                 } else {
 285                         $hash = md5( $name );
 286                         $path = '';
 287                         for ( $i = 1; $i <= $levels; $i++ ) {
 288                                 $path .= substr( $hash, 0, $i ) . '/';
 289                         }
 290                         return $path;
 291                 }
 292         }
 293
 294         /**
 295          * Get a relative path including trailing slash, e.g. f/fa/
 296          * If the repo is not hashed, returns an empty string
 297          */
 298         function getHashPath( $name ) {
 299                 return self::getHashPathForLevel( $name, $this->hashLevels );
 300         }
 301
 302         /**
 303          * Get the name of this repository, as specified by $info['name]' to the constructor
 304          */
 305         function getName() {
 306                 return $this->name;
 307         }
 308
 309         /**
 310          * Make an url to this repo
 311          *
 312          * @param $query mixed Query string to append
 313          * @param $entry string Entry point; defaults to index
 314          * @return string
 315          */
 316         function makeUrl( $query = '', $entry = 'index' ) {
 317                 $ext = isset( $this->scriptExtension ) ? $this->scriptExtension : '.php';
 318                 return wfAppendQuery( "{$this->scriptDirUrl}/{$entry}{$ext}", $query );
 319         }
 320
 321         /**
 322          * Get the URL of an image description page. May return false if it is
 323          * unknown or not applicable. In general this should only be called by the
 324          * File class, since it may return invalid results for certain kinds of
 325          * repositories. Use File::getDescriptionUrl() in user code.
 326          *
 327          * In particular, it uses the article paths as specified to the repository
 328          * constructor, whereas local repositories use the local Title functions.
 329          */
 330         function getDescriptionUrl( $name ) {
 331                 $encName = wfUrlencode( $name );
 332                 if ( !is_null( $this->descBaseUrl ) ) {
 333                         # "http://example.com/wiki/Image:"
 334                         return $this->descBaseUrl . $encName;
 335                 }
 336                 if ( !is_null( $this->articleUrl ) ) {
 337                         # "http://example.com/wiki/$1"
 338                         #
 339                         # We use "Image:" as the canonical namespace for
 340                         # compatibility across all MediaWiki versions.
 341                         return str_replace( '$1',
 342                                 "Image:$encName", $this->articleUrl );
 343                 }
 344                 if ( !is_null( $this->scriptDirUrl ) ) {
 345                         # "http://example.com/w"
 346                         #
 347                         # We use "Image:" as the canonical namespace for
 348                         # compatibility across all MediaWiki versions,
 349                         # and just sort of hope index.php is right. ;)
 350                         return $this->makeUrl( "title=Image:$encName" );
 351                 }
 352                 return false;
 353         }
 354
 355         /**
 356          * Get the URL of the content-only fragment of the description page. For
 357          * MediaWiki this means action=render. This should only be called by the
 358          * repository's file class, since it may return invalid results. User code
 359          * should use File::getDescriptionText().
 360          * @param $name String: name of image to fetch
 361          * @param $lang String: language to fetch it in, if any.
 362          */
 363         function getDescriptionRenderUrl( $name, $lang = null ) {
 364                 $query = 'action=render';
 365                 if ( !is_null( $lang ) ) {
 366                         $query .= '&uselang=' . $lang;
 367                 }
 368                 if ( isset( $this->scriptDirUrl ) ) {
 369                         return $this->makeUrl(
 370                                 'title=' .
 371                                 wfUrlencode( 'Image:' . $name ) .
 372                                 "&$query" );
 373                 } else {
 374                         $descUrl = $this->getDescriptionUrl( $name );
 375                         if ( $descUrl ) {
 376                                 return wfAppendQuery( $descUrl, $query );
 377                         } else {
 378                                 return false;
 379                         }
 380                 }
 381         }
 382
 383         /**
 384          * Get the URL of the stylesheet to apply to description pages
 385          * @return string
 386          */
 387         function getDescriptionStylesheetUrl() {
 388                 if ( $this->scriptDirUrl ) {
 389                         return $this->makeUrl( 'title=MediaWiki:Filepage.css&' .
 390                                 wfArrayToCGI( Skin::getDynamicStylesheetQuery() ) );
 391                 }
 392         }
 393
 394         /**
 395          * Store a file to a given destination.
 396          *
 397          * @param $srcPath String: source path or virtual URL
 398          * @param $dstZone String: destination zone
 399          * @param $dstRel String: destination relative path
 400          * @param $flags Integer: bitwise combination of the following flags:
 401          *     self::DELETE_SOURCE     Delete the source file after upload
 402          *     self::OVERWRITE         Overwrite an existing destination file instead of failing
 403          *     self::OVERWRITE_SAME    Overwrite the file if the destination exists and has the
 404          *                             same contents as the source
 405          * @return FileRepoStatus
 406          */
 407         function store( $srcPath, $dstZone, $dstRel, $flags = 0 ) {
 408                 $status = $this->storeBatch( array( array( $srcPath, $dstZone, $dstRel ) ), $flags );
 409                 if ( $status->successCount == 0 ) {
 410                         $status->ok = false;
 411                 }
 412                 return $status;
 413         }
 414
 415         /**
 416          * Store a batch of files
 417          *
 418          * @param $triplets Array: (src,zone,dest) triplets as per store()
 419          * @param $flags Integer: flags as per store
 420          */
 421         abstract function storeBatch( $triplets, $flags = 0 );
 422
 423         /**
 424          * Pick a random name in the temp zone and store a file to it.
 425          * Returns a FileRepoStatus object with the URL in the value.
 426          *
 427          * @param $originalName String: the base name of the file as specified
 428          *     by the user. The file extension will be maintained.
 429          * @param $srcPath String: the current location of the file.
 430          */
 431         abstract function storeTemp( $originalName, $srcPath );
 432
 433
 434         /**
 435          * Append the contents of the source path to the given file.
 436          * @param $srcPath String: location of the source file
 437          * @param $toAppendPath String: path to append to.
 438          * @param $flags Integer: bitfield, may be FileRepo::DELETE_SOURCE to indicate
 439          *        that the source file should be deleted if possible
 440          * @return mixed Status or false
 441          */
 442         abstract function append( $srcPath, $toAppendPath, $flags = 0 );
 443
 444         /**
 445          * Remove a temporary file or mark it for garbage collection
 446          * @param $virtualUrl String: the virtual URL returned by storeTemp
 447          * @return Boolean: true on success, false on failure
 448          * STUB
 449          */
 450         function freeTemp( $virtualUrl ) {
 451                 return true;
 452         }
 453
 454         /**
 455          * Copy or move a file either from the local filesystem or from an mwrepo://
 456          * virtual URL, into this repository at the specified destination location.
 457          *
 458          * Returns a FileRepoStatus object. On success, the value contains "new" or
 459          * "archived", to indicate whether the file was new with that name.
 460          *
 461          * @param $srcPath String: the source path or URL
 462          * @param $dstRel String: the destination relative path
 463          * @param $archiveRel String: rhe relative path where the existing file is to
 464          *        be archived, if there is one. Relative to the public zone root.
 465          * @param $flags Integer: bitfield, may be FileRepo::DELETE_SOURCE to indicate
 466          *        that the source file should be deleted if possible
 467          */
 468         function publish( $srcPath, $dstRel, $archiveRel, $flags = 0 ) {
 469                 $status = $this->publishBatch( array( array( $srcPath, $dstRel, $archiveRel ) ), $flags );
 470                 if ( $status->successCount == 0 ) {
 471                         $status->ok = false;
 472                 }
 473                 if ( isset( $status->value[0] ) ) {
 474                         $status->value = $status->value[0];
 475                 } else {
 476                         $status->value = false;
 477                 }
 478                 return $status;
 479         }
 480
 481         /**
 482          * Publish a batch of files
 483          * @param $triplets Array: (source,dest,archive) triplets as per publish()
 484          * @param $flags Integer: bitfield, may be FileRepo::DELETE_SOURCE to indicate
 485          *        that the source files should be deleted if possible
 486          */
 487         abstract function publishBatch( $triplets, $flags = 0 );
 488
 489         function fileExists( $file, $flags = 0 ) {
 490                 $result = $this->fileExistsBatch( array( $file ), $flags );
 491                 return $result[0];
 492         }
 493
 494         /**
 495          * Checks existence of an array of files.
 496          *
 497          * @param $files Array: URLs (or paths) of files to check
 498          * @param $flags Integer: bitwise combination of the following flags:
 499          *     self::FILES_ONLY     Mark file as existing only if it is a file (not directory)
 500          * @return Either array of files and existence flags, or false
 501          */
 502         abstract function fileExistsBatch( $files, $flags = 0 );
 503
 504         /**
 505          * Move a group of files to the deletion archive.
 506          *
 507          * If no valid deletion archive is configured, this may either delete the
 508          * file or throw an exception, depending on the preference of the repository.
 509          *
 510          * The overwrite policy is determined by the repository -- currently FSRepo
 511          * assumes a naming scheme in the deleted zone based on content hash, as
 512          * opposed to the public zone which is assumed to be unique.
 513          *
 514          * @param $sourceDestPairs Array of source/destination pairs. Each element
 515          *        is a two-element array containing the source file path relative to the
 516          *        public root in the first element, and the archive file path relative
 517          *        to the deleted zone root in the second element.
 518          * @return FileRepoStatus
 519          */
 520         abstract function deleteBatch( $sourceDestPairs );
 521
 522         /**
 523          * Move a file to the deletion archive.
 524          * If no valid deletion archive exists, this may either delete the file
 525          * or throw an exception, depending on the preference of the repository
 526          * @param $srcRel Mixed: relative path for the file to be deleted
 527          * @param $archiveRel Mixed: relative path for the archive location.
 528          *        Relative to a private archive directory.
 529          * @return FileRepoStatus object
 530          */
 531         function delete( $srcRel, $archiveRel ) {
 532                 return $this->deleteBatch( array( array( $srcRel, $archiveRel ) ) );
 533         }
 534
 535         /**
 536          * Get properties of a file with a given virtual URL
 537          * The virtual URL must refer to this repo
 538          * Properties should ultimately be obtained via File::getPropsFromPath()
 539          */
 540         abstract function getFileProps( $virtualUrl );
 541
 542         /**
 543          * Call a callback function for every file in the repository
 544          * May use either the database or the filesystem
 545          * STUB
 546          */
 547         function enumFiles( $callback ) {
 548                 throw new MWException( 'enumFiles is not supported by ' . get_class( $this ) );
 549         }
 550
 551         /**
 552          * Determine if a relative path is valid, i.e. not blank or involving directory traveral
 553          */
 554         function validateFilename( $filename ) {
 555                 if ( strval( $filename ) == '' ) {
 556                         return false;
 557                 }
 558                 if ( wfIsWindows() ) {
 559                         $filename = strtr( $filename, '\\', '/' );
 560                 }
 561                 /**
 562                  * Use the same traversal protection as Title::secureAndSplit()
 563                  */
 564                 if ( strpos( $filename, '.' ) !== false &&
 565                      ( $filename === '.' || $filename === '..' ||
 566                        strpos( $filename, './' ) === 0  ||
 567                        strpos( $filename, '../' ) === 0 ||
 568                        strpos( $filename, '/./' ) !== false ||
 569                        strpos( $filename, '/../' ) !== false ) )
 570                 {
 571                         return false;
 572                 } else {
 573                         return true;
 574                 }
 575         }
 576
 577         /**#@+
 578          * Path disclosure protection functions
 579          */
 580         function paranoidClean( $param ) { return '[hidden]'; }
 581         function passThrough( $param ) { return $param; }
 582
 583         /**
 584          * Get a callback function to use for cleaning error message parameters
 585          */
 586         function getErrorCleanupFunction() {
 587                 switch ( $this->pathDisclosureProtection ) {
 588                         case 'none':
 589                                 $callback = array( $this, 'passThrough' );
 590                                 break;
 591                         default: // 'paranoid'
 592                                 $callback = array( $this, 'paranoidClean' );
 593                 }
 594                 return $callback;
 595         }
 596         /**#@-*/
 597
 598         /**
 599          * Create a new fatal error
 600          */
 601         function newFatal( $message /*, parameters...*/ ) {
 602                 $params = func_get_args();
 603                 array_unshift( $params, $this );
 604                 return call_user_func_array( array( 'FileRepoStatus', 'newFatal' ), $params );
 605         }
 606
 607         /**
 608          * Create a new good result
 609          */
 610         function newGood( $value = null ) {
 611                 return FileRepoStatus::newGood( $this, $value );
 612         }
 613
 614         /**
 615          * Delete files in the deleted directory if they are not referenced in the filearchive table
 616          * STUB
 617          */
 618         function cleanupDeletedBatch( $storageKeys ) {}
 619
 620         /**
 621          * Checks if there is a redirect named as $title. If there is, return the
 622          * title object. If not, return false.
 623          * STUB
 624          *
 625          * @param $title Title of image
 626          */
 627         function checkRedirect( $title ) {
 628                 return false;
 629         }
 630
 631         /**
 632          * Invalidates image redirect cache related to that image
 633          * Doesn't do anything for repositories that don't support image redirects.
 634          *
 635          * STUB
 636          * @param $title Title of image
 637          */
 638         function invalidateImageRedirect( $title ) {}
 639
 640         /**
 641          * Get an array or iterator of file objects for files that have a given
 642          * SHA-1 content hash.
 643          *
 644          * STUB
 645          */
 646         function findBySha1( $hash ) {
 647                 return array();
 648         }
 649
 650         /**
 651          * Get the human-readable name of the repo.
 652          * @return string
 653          */
 654         public function getDisplayName() {
 655                 // We don't name our own repo, return nothing
 656                 if ( $this->isLocal() ) {
 657                         return null;
 658                 }
 659                 // 'shared-repo-name-wikimediacommons' is used when $wgUseInstantCommons = true
 660                 $repoName = wfMsg( 'shared-repo-name-' . $this->name );
 661                 if ( !wfEmptyMsg( 'shared-repo-name-' . $this->name, $repoName ) ) {
 662                         return $repoName;
 663                 }
 664                 return wfMsg( 'shared-repo' );
 665         }
 666
 667         /**
 668          * Returns true if this the local file repository.
 669          *
 670          * @return bool
 671          */
 672         function isLocal() {
 673                 return $this->getName() == 'local';
 674         }
 675
 676
 677         /**
 678          * Get a key on the primary cache for this repository.
 679          * Returns false if the repository's cache is not accessible at this site.
 680          * The parameters are the parts of the key, as for wfMemcKey().
 681          *
 682          * STUB
 683          */
 684         function getSharedCacheKey( /*...*/ ) {
 685                 return false;
 686         }
 687
 688         /**
 689          * Get a key for this repo in the local cache domain. These cache keys are
 690          * not shared with remote instances of the repo.
 691          * The parameters are the parts of the key, as for wfMemcKey().
 692          */
 693         function getLocalCacheKey( /*...*/ ) {
 694                 $args = func_get_args();
 695                 array_unshift( $args, 'filerepo', $this->getName() );
 696                 return call_user_func_array( 'wfMemcKey', $args );
 697         }
 698 }