includes/filerepo/FileRepo.php

   1 <?php
   2 /**
   3  * @defgroup FileRepo File Repository
   4  *
   5  * @brief This module handles how MediaWiki interacts with filesystems.
   6  *
   7  * @details
   8  */
   9
  10 /**
  11  * Base code for file repositories.
  12  *
  13  * This program is free software; you can redistribute it and/or modify
  14  * it under the terms of the GNU General Public License as published by
  15  * the Free Software Foundation; either version 2 of the License, or
  16  * (at your option) any later version.
  17  *
  18  * This program is distributed in the hope that it will be useful,
  19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  21  * GNU General Public License for more details.
  22  *
  23  * You should have received a copy of the GNU General Public License along
  24  * with this program; if not, write to the Free Software Foundation, Inc.,
  25  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  26  * http://www.gnu.org/copyleft/gpl.html
  27  *
  28  * @file
  29  * @ingroup FileRepo
  30  */
  31
  32 /**
  33  * Base class for file repositories
  34  *
  35  * @ingroup FileRepo
  36  */
  37 class FileRepo {
  38         const DELETE_SOURCE = 1;
  39         const OVERWRITE = 2;
  40         const OVERWRITE_SAME = 4;
  41         const SKIP_LOCKING = 8;
  42
  43         /** @var FileBackend */
  44         protected $backend;
  45         /** @var Array Map of zones to config */
  46         protected $zones = array();
  47
  48         var $thumbScriptUrl, $transformVia404;
  49         var $descBaseUrl, $scriptDirUrl, $scriptExtension, $articleUrl;
  50         var $fetchDescription, $initialCapital;
  51         var $pathDisclosureProtection = 'simple'; // 'paranoid'
  52         var $descriptionCacheExpiry, $url, $thumbUrl;
  53         var $hashLevels, $deletedHashLevels;
  54         protected $abbrvThreshold;
  55
  56         /**
  57          * Factory functions for creating new files
  58          * Override these in the base class
  59          */
  60         var $fileFactory = array( 'UnregisteredLocalFile', 'newFromTitle' );
  61         var $oldFileFactory = false;
  62         var $fileFactoryKey = false, $oldFileFactoryKey = false;
  63
  64         /**
  65          * @param $info array|null
  66          * @throws MWException
  67          */
  68         public function __construct( array $info = null ) {
  69                 // Verify required settings presence
  70                 if(
  71                         $info === null
  72                         || !array_key_exists( 'name', $info )
  73                         || !array_key_exists( 'backend', $info )
  74                 ) {
  75                         throw new MWException( __CLASS__ . " requires an array of options having both 'name' and 'backend' keys.\n" );
  76                 }
  77
  78                 // Required settings
  79                 $this->name = $info['name'];
  80                 if ( $info['backend'] instanceof FileBackend ) {
  81                         $this->backend = $info['backend']; // useful for testing
  82                 } else {
  83                         $this->backend = FileBackendGroup::singleton()->get( $info['backend'] );
  84                 }
  85
  86                 // Optional settings that can have no value
  87                 $optionalSettings = array(
  88                         'descBaseUrl', 'scriptDirUrl', 'articleUrl', 'fetchDescription',
  89                         'thumbScriptUrl', 'pathDisclosureProtection', 'descriptionCacheExpiry',
  90                         'scriptExtension'
  91                 );
  92                 foreach ( $optionalSettings as $var ) {
  93                         if ( isset( $info[$var] ) ) {
  94                                 $this->$var = $info[$var];
  95                         }
  96                 }
  97
  98                 // Optional settings that have a default
  99                 $this->initialCapital = isset( $info['initialCapital'] )
 100                         ? $info['initialCapital']
 101                         : MWNamespace::isCapitalized( NS_FILE );
 102                 $this->url = isset( $info['url'] )
 103                         ? $info['url']
 104                         : false; // a subclass may set the URL (e.g. ForeignAPIRepo)
 105                 if ( isset( $info['thumbUrl'] ) ) {
 106                         $this->thumbUrl = $info['thumbUrl'];
 107                 } else {
 108                         $this->thumbUrl = $this->url ? "{$this->url}/thumb" : false;
 109                 }
 110                 $this->hashLevels = isset( $info['hashLevels'] )
 111                         ? $info['hashLevels']
 112                         : 2;
 113                 $this->deletedHashLevels = isset( $info['deletedHashLevels'] )
 114                         ? $info['deletedHashLevels']
 115                         : $this->hashLevels;
 116                 $this->transformVia404 = !empty( $info['transformVia404'] );
 117                 $this->abbrvThreshold = isset( $info['abbrvThreshold'] )
 118                         ? $info['abbrvThreshold']
 119                         : 255;
 120                 $this->isPrivate = !empty( $info['isPrivate'] );
 121                 // Give defaults for the basic zones...
 122                 $this->zones = isset( $info['zones'] ) ? $info['zones'] : array();
 123                 foreach ( array( 'public', 'thumb', 'temp', 'deleted' ) as $zone ) {
 124                         if ( !isset( $this->zones[$zone]['container'] ) ) {
 125                                 $this->zones[$zone]['container'] = "{$this->name}-{$zone}";
 126                         }
 127                         if ( !isset( $this->zones[$zone]['directory'] ) ) {
 128                                 $this->zones[$zone]['directory'] = '';
 129                         }
 130                         if ( !isset( $this->zones[$zone]['urlsByExt'] ) ) {
 131                                 $this->zones[$zone]['urlsByExt'] = array();
 132                         }
 133                 }
 134         }
 135
 136         /**
 137          * Get the file backend instance. Use this function wisely.
 138          *
 139          * @return FileBackend
 140          */
 141         public function getBackend() {
 142                 return $this->backend;
 143         }
 144
 145         /**
 146          * Get an explanatory message if this repo is read-only.
 147          * This checks if an administrator disabled writes to the backend.
 148          *
 149          * @return string|bool Returns false if the repo is not read-only
 150          */
 151         public function getReadOnlyReason() {
 152                 return $this->backend->getReadOnlyReason();
 153         }
 154
 155         /**
 156          * Check if a single zone or list of zones is defined for usage
 157          *
 158          * @param $doZones Array Only do a particular zones
 159          * @throws MWException
 160          * @return Status
 161          */
 162         protected function initZones( $doZones = array() ) {
 163                 $status = $this->newGood();
 164                 foreach ( (array)$doZones as $zone ) {
 165                         $root = $this->getZonePath( $zone );
 166                         if ( $root === null ) {
 167                                 throw new MWException( "No '$zone' zone defined in the {$this->name} repo." );
 168                         }
 169                 }
 170                 return $status;
 171         }
 172
 173         /**
 174          * Determine if a string is an mwrepo:// URL
 175          *
 176          * @param $url string
 177          * @return bool
 178          */
 179         public static function isVirtualUrl( $url ) {
 180                 return substr( $url, 0, 9 ) == 'mwrepo://';
 181         }
 182
 183         /**
 184          * Get a URL referring to this repository, with the private mwrepo protocol.
 185          * The suffix, if supplied, is considered to be unencoded, and will be
 186          * URL-encoded before being returned.
 187          *
 188          * @param $suffix string|bool
 189          * @return string
 190          */
 191         public function getVirtualUrl( $suffix = false ) {
 192                 $path = 'mwrepo://' . $this->name;
 193                 if ( $suffix !== false ) {
 194                         $path .= '/' . rawurlencode( $suffix );
 195                 }
 196                 return $path;
 197         }
 198
 199         /**
 200          * Get the URL corresponding to one of the four basic zones
 201          *
 202          * @param $zone String One of: public, deleted, temp, thumb
 203          * @param $ext String|null Optional file extension
 204          * @return String or false
 205          */
 206         public function getZoneUrl( $zone, $ext = null ) {
 207                 if ( in_array( $zone, array( 'public', 'temp', 'thumb' ) ) ) { // standard public zones
 208                         if ( $ext !== null && isset( $this->zones[$zone]['urlsByExt'][$ext] ) ) {
 209                                 return $this->zones[$zone]['urlsByExt'][$ext]; // custom URL for extension/zone
 210                         } elseif ( isset( $this->zones[$zone]['url'] ) ) {
 211                                 return $this->zones[$zone]['url']; // custom URL for zone
 212                         }
 213                 }
 214                 switch ( $zone ) {
 215                         case 'public':
 216                                 return $this->url;
 217                         case 'temp':
 218                                 return "{$this->url}/temp";
 219                         case 'deleted':
 220                                 return false; // no public URL
 221                         case 'thumb':
 222                                 return $this->thumbUrl;
 223                         default:
 224                                 return false;
 225                 }
 226         }
 227
 228         /**
 229          * Get the thumb zone URL configured to be handled by scripts like thumb_handler.php.
 230          * This is probably only useful for internal requests, such as from a fast frontend server
 231          * to a slower backend server.
 232          *
 233          * Large sites may use a different host name for uploads than for wikis. In any case, the
 234          * wiki configuration is needed in order to use thumb.php. To avoid extracting the wiki ID
 235          * from the URL path, one can configure thumb_handler.php to recognize a special path on the
 236          * same host name as the wiki that is used for viewing thumbnails.
 237          *
 238          * @param $zone String: one of: public, deleted, temp, thumb
 239          * @return String or false
 240          */
 241         public function getZoneHandlerUrl( $zone ) {
 242                 if ( isset( $this->zones[$zone]['handlerUrl'] )
 243                         && in_array( $zone, array( 'public', 'temp', 'thumb' ) ) )
 244                 {
 245                         return $this->zones[$zone]['handlerUrl'];
 246                 }
 247                 return false;
 248         }
 249
 250         /**
 251          * Get the backend storage path corresponding to a virtual URL.
 252          * Use this function wisely.
 253          *
 254          * @param $url string
 255          * @throws MWException
 256          * @return string
 257          */
 258         public function resolveVirtualUrl( $url ) {
 259                 if ( substr( $url, 0, 9 ) != 'mwrepo://' ) {
 260                         throw new MWException( __METHOD__.': unknown protocol' );
 261                 }
 262                 $bits = explode( '/', substr( $url, 9 ), 3 );
 263                 if ( count( $bits ) != 3 ) {
 264                         throw new MWException( __METHOD__.": invalid mwrepo URL: $url" );
 265                 }
 266                 list( $repo, $zone, $rel ) = $bits;
 267                 if ( $repo !== $this->name ) {
 268                         throw new MWException( __METHOD__.": fetching from a foreign repo is not supported" );
 269                 }
 270                 $base = $this->getZonePath( $zone );
 271                 if ( !$base ) {
 272                         throw new MWException( __METHOD__.": invalid zone: $zone" );
 273                 }
 274                 return $base . '/' . rawurldecode( $rel );
 275         }
 276
 277         /**
 278          * The the storage container and base path of a zone
 279          *
 280          * @param $zone string
 281          * @return Array (container, base path) or (null, null)
 282          */
 283         protected function getZoneLocation( $zone ) {
 284                 if ( !isset( $this->zones[$zone] ) ) {
 285                         return array( null, null ); // bogus
 286                 }
 287                 return array( $this->zones[$zone]['container'], $this->zones[$zone]['directory'] );
 288         }
 289
 290         /**
 291          * Get the storage path corresponding to one of the zones
 292          *
 293          * @param $zone string
 294          * @return string|null Returns null if the zone is not defined
 295          */
 296         public function getZonePath( $zone ) {
 297                 list( $container, $base ) = $this->getZoneLocation( $zone );
 298                 if ( $container === null || $base === null ) {
 299                         return null;
 300                 }
 301                 $backendName = $this->backend->getName();
 302                 if ( $base != '' ) { // may not be set
 303                         $base = "/{$base}";
 304                 }
 305                 return "mwstore://$backendName/{$container}{$base}";
 306         }
 307
 308         /**
 309          * Create a new File object from the local repository
 310          *
 311          * @param $title Mixed: Title object or string
 312          * @param $time Mixed: Time at which the image was uploaded.
 313          *              If this is specified, the returned object will be an
 314          *              instance of the repository's old file class instead of a
 315          *              current file. Repositories not supporting version control
 316          *              should return false if this parameter is set.
 317          * @return File|null A File, or null if passed an invalid Title
 318          */
 319         public function newFile( $title, $time = false ) {
 320                 $title = File::normalizeTitle( $title );
 321                 if ( !$title ) {
 322                         return null;
 323                 }
 324                 if ( $time ) {
 325                         if ( $this->oldFileFactory ) {
 326                                 return call_user_func( $this->oldFileFactory, $title, $this, $time );
 327                         } else {
 328                                 return false;
 329                         }
 330                 } else {
 331                         return call_user_func( $this->fileFactory, $title, $this );
 332                 }
 333         }
 334
 335         /**
 336          * Find an instance of the named file created at the specified time
 337          * Returns false if the file does not exist. Repositories not supporting
 338          * version control should return false if the time is specified.
 339          *
 340          * @param $title Mixed: Title object or string
 341          * @param $options array Associative array of options:
 342          *     time:           requested time for a specific file version, or false for the
 343          *                     current version. An image object will be returned which was
 344          *                     created at the specified time (which may be archived or current).
 345          *
 346          *     ignoreRedirect: If true, do not follow file redirects
 347          *
 348          *     private:        If true, return restricted (deleted) files if the current
 349          *                     user is allowed to view them. Otherwise, such files will not
 350          *                     be found.
 351          * @return File|bool False on failure
 352          */
 353         public function findFile( $title, $options = array() ) {
 354                 $title = File::normalizeTitle( $title );
 355                 if ( !$title ) {
 356                         return false;
 357                 }
 358                 $time = isset( $options['time'] ) ? $options['time'] : false;
 359                 # First try the current version of the file to see if it precedes the timestamp
 360                 $img = $this->newFile( $title );
 361                 if ( !$img ) {
 362                         return false;
 363                 }
 364                 if ( $img->exists() && ( !$time || $img->getTimestamp() == $time ) ) {
 365                         return $img;
 366                 }
 367                 # Now try an old version of the file
 368                 if ( $time !== false ) {
 369                         $img = $this->newFile( $title, $time );
 370                         if ( $img && $img->exists() ) {
 371                                 if ( !$img->isDeleted( File::DELETED_FILE ) ) {
 372                                         return $img; // always OK
 373                                 } elseif ( !empty( $options['private'] ) && $img->userCan( File::DELETED_FILE ) ) {
 374                                         return $img;
 375                                 }
 376                         }
 377                 }
 378
 379                 # Now try redirects
 380                 if ( !empty( $options['ignoreRedirect'] ) ) {
 381                         return false;
 382                 }
 383                 $redir = $this->checkRedirect( $title );
 384                 if ( $redir && $title->getNamespace() == NS_FILE) {
 385                         $img = $this->newFile( $redir );
 386                         if ( !$img ) {
 387                                 return false;
 388                         }
 389                         if ( $img->exists() ) {
 390                                 $img->redirectedFrom( $title->getDBkey() );
 391                                 return $img;
 392                         }
 393                 }
 394                 return false;
 395         }
 396
 397         /**
 398          * Find many files at once.
 399          *
 400          * @param $items array An array of titles, or an array of findFile() options with
 401          *    the "title" option giving the title. Example:
 402          *
 403          *     $findItem = array( 'title' => $title, 'private' => true );
 404          *     $findBatch = array( $findItem );
 405          *     $repo->findFiles( $findBatch );
 406          * @return array
 407          */
 408         public function findFiles( array $items ) {
 409                 $result = array();
 410                 foreach ( $items as $item ) {
 411                         if ( is_array( $item ) ) {
 412                                 $title = $item['title'];
 413                                 $options = $item;
 414                                 unset( $options['title'] );
 415                         } else {
 416                                 $title = $item;
 417                                 $options = array();
 418                         }
 419                         $file = $this->findFile( $title, $options );
 420                         if ( $file ) {
 421                                 $result[$file->getTitle()->getDBkey()] = $file;
 422                         }
 423                 }
 424                 return $result;
 425         }
 426
 427         /**
 428          * Find an instance of the file with this key, created at the specified time
 429          * Returns false if the file does not exist. Repositories not supporting
 430          * version control should return false if the time is specified.
 431          *
 432          * @param $sha1 String base 36 SHA-1 hash
 433          * @param $options array Option array, same as findFile().
 434          * @return File|bool False on failure
 435          */
 436         public function findFileFromKey( $sha1, $options = array() ) {
 437                 $time = isset( $options['time'] ) ? $options['time'] : false;
 438                 # First try to find a matching current version of a file...
 439                 if ( $this->fileFactoryKey ) {
 440                         $img = call_user_func( $this->fileFactoryKey, $sha1, $this, $time );
 441                 } else {
 442                         return false; // find-by-sha1 not supported
 443                 }
 444                 if ( $img && $img->exists() ) {
 445                         return $img;
 446                 }
 447                 # Now try to find a matching old version of a file...
 448                 if ( $time !== false && $this->oldFileFactoryKey ) { // find-by-sha1 supported?
 449                         $img = call_user_func( $this->oldFileFactoryKey, $sha1, $this, $time );
 450                         if ( $img && $img->exists() ) {
 451                                 if ( !$img->isDeleted( File::DELETED_FILE ) ) {
 452                                         return $img; // always OK
 453                                 } elseif ( !empty( $options['private'] ) && $img->userCan( File::DELETED_FILE ) ) {
 454                                         return $img;
 455                                 }
 456                         }
 457                 }
 458                 return false;
 459         }
 460
 461         /**
 462          * Get an array or iterator of file objects for files that have a given
 463          * SHA-1 content hash.
 464          *
 465          * STUB
 466          * @param $hash
 467          * @return array
 468          */
 469         public function findBySha1( $hash ) {
 470                 return array();
 471         }
 472
 473         /**
 474          * Get an array of arrays or iterators of file objects for files that
 475          * have the given SHA-1 content hashes.
 476          *
 477          * @param $hashes array An array of hashes
 478          * @return array An Array of arrays or iterators of file objects and the hash as key
 479          */
 480         public function findBySha1s( array $hashes ) {
 481                 $result = array();
 482                 foreach ( $hashes as $hash ) {
 483                         $files = $this->findBySha1( $hash );
 484                         if ( count( $files ) ) {
 485                                 $result[$hash] = $files;
 486                         }
 487                 }
 488                 return $result;
 489         }
 490
 491         /**
 492          * Get the public root URL of the repository
 493          *
 494          * @deprecated since 1.20
 495          * @return string
 496          */
 497         public function getRootUrl() {
 498                 return $this->getZoneUrl( 'public' );
 499         }
 500
 501         /**
 502          * Get the URL of thumb.php
 503          *
 504          * @return string
 505          */
 506         public function getThumbScriptUrl() {
 507                 return $this->thumbScriptUrl;
 508         }
 509
 510         /**
 511          * Returns true if the repository can transform files via a 404 handler
 512          *
 513          * @return bool
 514          */
 515         public function canTransformVia404() {
 516                 return $this->transformVia404;
 517         }
 518
 519         /**
 520          * Get the name of an image from its title object
 521          *
 522          * @param $title Title
 523          * @return String
 524          */
 525         public function getNameFromTitle( Title $title ) {
 526                 global $wgContLang;
 527                 if ( $this->initialCapital != MWNamespace::isCapitalized( NS_FILE ) ) {
 528                         $name = $title->getUserCaseDBKey();
 529                         if ( $this->initialCapital ) {
 530                                 $name = $wgContLang->ucfirst( $name );
 531                         }
 532                 } else {
 533                         $name = $title->getDBkey();
 534                 }
 535                 return $name;
 536         }
 537
 538         /**
 539          * Get the public zone root storage directory of the repository
 540          *
 541          * @return string
 542          */
 543         public function getRootDirectory() {
 544                 return $this->getZonePath( 'public' );
 545         }
 546
 547         /**
 548          * Get a relative path including trailing slash, e.g. f/fa/
 549          * If the repo is not hashed, returns an empty string
 550          *
 551          * @param $name string Name of file
 552          * @return string
 553          */
 554         public function getHashPath( $name ) {
 555                 return self::getHashPathForLevel( $name, $this->hashLevels );
 556         }
 557
 558         /**
 559          * Get a relative path including trailing slash, e.g. f/fa/
 560          * If the repo is not hashed, returns an empty string
 561          *
 562          * @param $suffix string Basename of file from FileRepo::storeTemp()
 563          * @return string
 564          */
 565         public function getTempHashPath( $suffix ) {
 566                 $parts = explode( '!', $suffix, 2 ); // format is <timestamp>!<name> or just <name>
 567                 $name = isset( $parts[1] ) ? $parts[1] : $suffix; // hash path is not based on timestamp
 568                 return self::getHashPathForLevel( $name, $this->hashLevels );
 569         }
 570
 571         /**
 572          * @param $name
 573          * @param $levels
 574          * @return string
 575          */
 576         protected static function getHashPathForLevel( $name, $levels ) {
 577                 if ( $levels == 0 ) {
 578                         return '';
 579                 } else {
 580                         $hash = md5( $name );
 581                         $path = '';
 582                         for ( $i = 1; $i <= $levels; $i++ ) {
 583                                 $path .= substr( $hash, 0, $i ) . '/';
 584                         }
 585                         return $path;
 586                 }
 587         }
 588
 589         /**
 590          * Get the number of hash directory levels
 591          *
 592          * @return integer
 593          */
 594         public function getHashLevels() {
 595                 return $this->hashLevels;
 596         }
 597
 598         /**
 599          * Get the name of this repository, as specified by $info['name]' to the constructor
 600          *
 601          * @return string
 602          */
 603         public function getName() {
 604                 return $this->name;
 605         }
 606
 607         /**
 608          * Make an url to this repo
 609          *
 610          * @param $query mixed Query string to append
 611          * @param $entry string Entry point; defaults to index
 612          * @return string|bool False on failure
 613          */
 614         public function makeUrl( $query = '', $entry = 'index' ) {
 615                 if ( isset( $this->scriptDirUrl ) ) {
 616                         $ext = isset( $this->scriptExtension ) ? $this->scriptExtension : '.php';
 617                         return wfAppendQuery( "{$this->scriptDirUrl}/{$entry}{$ext}", $query );
 618                 }
 619                 return false;
 620         }
 621
 622         /**
 623          * Get the URL of an image description page. May return false if it is
 624          * unknown or not applicable. In general this should only be called by the
 625          * File class, since it may return invalid results for certain kinds of
 626          * repositories. Use File::getDescriptionUrl() in user code.
 627          *
 628          * In particular, it uses the article paths as specified to the repository
 629          * constructor, whereas local repositories use the local Title functions.
 630          *
 631          * @param $name string
 632          * @return string
 633          */
 634         public function getDescriptionUrl( $name ) {
 635                 $encName = wfUrlencode( $name );
 636                 if ( !is_null( $this->descBaseUrl ) ) {
 637                         # "http://example.com/wiki/Image:"
 638                         return $this->descBaseUrl . $encName;
 639                 }
 640                 if ( !is_null( $this->articleUrl ) ) {
 641                         # "http://example.com/wiki/$1"
 642                         #
 643                         # We use "Image:" as the canonical namespace for
 644                         # compatibility across all MediaWiki versions.
 645                         return str_replace( '$1',
 646                                 "Image:$encName", $this->articleUrl );
 647                 }
 648                 if ( !is_null( $this->scriptDirUrl ) ) {
 649                         # "http://example.com/w"
 650                         #
 651                         # We use "Image:" as the canonical namespace for
 652                         # compatibility across all MediaWiki versions,
 653                         # and just sort of hope index.php is right. ;)
 654                         return $this->makeUrl( "title=Image:$encName" );
 655                 }
 656                 return false;
 657         }
 658
 659         /**
 660          * Get the URL of the content-only fragment of the description page. For
 661          * MediaWiki this means action=render. This should only be called by the
 662          * repository's file class, since it may return invalid results. User code
 663          * should use File::getDescriptionText().
 664          *
 665          * @param $name String: name of image to fetch
 666          * @param $lang String: language to fetch it in, if any.
 667          * @return string
 668          */
 669         public function getDescriptionRenderUrl( $name, $lang = null ) {
 670                 $query = 'action=render';
 671                 if ( !is_null( $lang ) ) {
 672                         $query .= '&uselang=' . $lang;
 673                 }
 674                 if ( isset( $this->scriptDirUrl ) ) {
 675                         return $this->makeUrl(
 676                                 'title=' .
 677                                 wfUrlencode( 'Image:' . $name ) .
 678                                 "&$query" );
 679                 } else {
 680                         $descUrl = $this->getDescriptionUrl( $name );
 681                         if ( $descUrl ) {
 682                                 return wfAppendQuery( $descUrl, $query );
 683                         } else {
 684                                 return false;
 685                         }
 686                 }
 687         }
 688
 689         /**
 690          * Get the URL of the stylesheet to apply to description pages
 691          *
 692          * @return string|bool False on failure
 693          */
 694         public function getDescriptionStylesheetUrl() {
 695                 if ( isset( $this->scriptDirUrl ) ) {
 696                         return $this->makeUrl( 'title=MediaWiki:Filepage.css&' .
 697                                 wfArrayToCGI( Skin::getDynamicStylesheetQuery() ) );
 698                 }
 699                 return false;
 700         }
 701
 702         /**
 703          * Store a file to a given destination.
 704          *
 705          * @param $srcPath String: source file system path, storage path, or virtual URL
 706          * @param $dstZone String: destination zone
 707          * @param $dstRel String: destination relative path
 708          * @param $flags Integer: bitwise combination of the following flags:
 709          *     self::DELETE_SOURCE     Delete the source file after upload
 710          *     self::OVERWRITE         Overwrite an existing destination file instead of failing
 711          *     self::OVERWRITE_SAME    Overwrite the file if the destination exists and has the
 712          *                             same contents as the source
 713          *     self::SKIP_LOCKING      Skip any file locking when doing the store
 714          * @return FileRepoStatus
 715          */
 716         public function store( $srcPath, $dstZone, $dstRel, $flags = 0 ) {
 717                 $this->assertWritableRepo(); // fail out if read-only
 718
 719                 $status = $this->storeBatch( array( array( $srcPath, $dstZone, $dstRel ) ), $flags );
 720                 if ( $status->successCount == 0 ) {
 721                         $status->ok = false;
 722                 }
 723
 724                 return $status;
 725         }
 726
 727         /**
 728          * Store a batch of files
 729          *
 730          * @param $triplets Array: (src, dest zone, dest rel) triplets as per store()
 731          * @param $flags Integer: bitwise combination of the following flags:
 732          *     self::DELETE_SOURCE     Delete the source file after upload
 733          *     self::OVERWRITE         Overwrite an existing destination file instead of failing
 734          *     self::OVERWRITE_SAME    Overwrite the file if the destination exists and has the
 735          *                             same contents as the source
 736          *     self::SKIP_LOCKING      Skip any file locking when doing the store
 737          * @throws MWException
 738          * @return FileRepoStatus
 739          */
 740         public function storeBatch( array $triplets, $flags = 0 ) {
 741                 $this->assertWritableRepo(); // fail out if read-only
 742
 743                 $status = $this->newGood();
 744                 $backend = $this->backend; // convenience
 745
 746                 $operations = array();
 747                 $sourceFSFilesToDelete = array(); // cleanup for disk source files
 748                 // Validate each triplet and get the store operation...
 749                 foreach ( $triplets as $triplet ) {
 750                         list( $srcPath, $dstZone, $dstRel ) = $triplet;
 751                         wfDebug( __METHOD__
 752                                 . "( \$src='$srcPath', \$dstZone='$dstZone', \$dstRel='$dstRel' )\n"
 753                         );
 754
 755                         // Resolve destination path
 756                         $root = $this->getZonePath( $dstZone );
 757                         if ( !$root ) {
 758                                 throw new MWException( "Invalid zone: $dstZone" );
 759                         }
 760                         if ( !$this->validateFilename( $dstRel ) ) {
 761                                 throw new MWException( 'Validation error in $dstRel' );
 762                         }
 763                         $dstPath = "$root/$dstRel";
 764                         $dstDir  = dirname( $dstPath );
 765                         // Create destination directories for this triplet
 766                         if ( !$this->initDirectory( $dstDir )->isOK() ) {
 767                                 return $this->newFatal( 'directorycreateerror', $dstDir );
 768                         }
 769
 770                         // Resolve source to a storage path if virtual
 771                         $srcPath = $this->resolveToStoragePath( $srcPath );
 772
 773                         // Get the appropriate file operation
 774                         if ( FileBackend::isStoragePath( $srcPath ) ) {
 775                                 $opName = ( $flags & self::DELETE_SOURCE ) ? 'move' : 'copy';
 776                         } else {
 777                                 $opName = 'store';
 778                                 if ( $flags & self::DELETE_SOURCE ) {
 779                                         $sourceFSFilesToDelete[] = $srcPath;
 780                                 }
 781                         }
 782                         $operations[] = array(
 783                                 'op'            => $opName,
 784                                 'src'           => $srcPath,
 785                                 'dst'           => $dstPath,
 786                                 'overwrite'     => $flags & self::OVERWRITE,
 787                                 'overwriteSame' => $flags & self::OVERWRITE_SAME,
 788                         );
 789                 }
 790
 791                 // Execute the store operation for each triplet
 792                 $opts = array( 'force' => true );
 793                 if ( $flags & self::SKIP_LOCKING ) {
 794                         $opts['nonLocking'] = true;
 795                 }
 796                 $status->merge( $backend->doOperations( $operations, $opts ) );
 797                 // Cleanup for disk source files...
 798                 foreach ( $sourceFSFilesToDelete as $file ) {
 799                         wfSuppressWarnings();
 800                         unlink( $file ); // FS cleanup
 801                         wfRestoreWarnings();
 802                 }
 803
 804                 return $status;
 805         }
 806
 807         /**
 808          * Deletes a batch of files.
 809          * Each file can be a (zone, rel) pair, virtual url, storage path.
 810          * It will try to delete each file, but ignores any errors that may occur.
 811          *
 812          * @param $files array List of files to delete
 813          * @param $flags Integer: bitwise combination of the following flags:
 814          *     self::SKIP_LOCKING      Skip any file locking when doing the deletions
 815          * @return FileRepoStatus
 816          */
 817         public function cleanupBatch( array $files, $flags = 0 ) {
 818                 $this->assertWritableRepo(); // fail out if read-only
 819
 820                 $status = $this->newGood();
 821
 822                 $operations = array();
 823                 foreach ( $files as $path ) {
 824                         if ( is_array( $path ) ) {
 825                                 // This is a pair, extract it
 826                                 list( $zone, $rel ) = $path;
 827                                 $path = $this->getZonePath( $zone ) . "/$rel";
 828                         } else {
 829                                 // Resolve source to a storage path if virtual
 830                                 $path = $this->resolveToStoragePath( $path );
 831                         }
 832                         $operations[] = array( 'op' => 'delete', 'src' => $path );
 833                 }
 834                 // Actually delete files from storage...
 835                 $opts = array( 'force' => true );
 836                 if ( $flags & self::SKIP_LOCKING ) {
 837                         $opts['nonLocking'] = true;
 838                 }
 839                 $status->merge( $this->backend->doOperations( $operations, $opts ) );
 840
 841                 return $status;
 842         }
 843
 844         /**
 845          * Import a file from the local file system into the repo.
 846          * This does no locking nor journaling and overrides existing files.
 847          * This function can be used to write to otherwise read-only foreign repos.
 848          * This is intended for copying generated thumbnails into the repo.
 849          *
 850          * @param $src string Source file system path, storage path, or virtual URL
 851          * @param $dst string Virtual URL or storage path
 852          * @param $disposition string|null Content-Disposition if given and supported
 853          * @return FileRepoStatus
 854          */
 855         final public function quickImport( $src, $dst, $disposition = null ) {
 856                 return $this->quickImportBatch( array( array( $src, $dst, $disposition ) ) );
 857         }
 858
 859         /**
 860          * Purge a file from the repo. This does no locking nor journaling.
 861          * This function can be used to write to otherwise read-only foreign repos.
 862          * This is intended for purging thumbnails.
 863          *
 864          * @param $path string Virtual URL or storage path
 865          * @return FileRepoStatus
 866          */
 867         final public function quickPurge( $path ) {
 868                 return $this->quickPurgeBatch( array( $path ) );
 869         }
 870
 871         /**
 872          * Deletes a directory if empty.
 873          * This function can be used to write to otherwise read-only foreign repos.
 874          *
 875          * @param $dir string Virtual URL (or storage path) of directory to clean
 876          * @return Status
 877          */
 878         public function quickCleanDir( $dir ) {
 879                 $status = $this->newGood();
 880                 $status->merge( $this->backend->clean(
 881                         array( 'dir' => $this->resolveToStoragePath( $dir ) ) ) );
 882
 883                 return $status;
 884         }
 885
 886         /**
 887          * Import a batch of files from the local file system into the repo.
 888          * This does no locking nor journaling and overrides existing files.
 889          * This function can be used to write to otherwise read-only foreign repos.
 890          * This is intended for copying generated thumbnails into the repo.
 891          *
 892          * All path parameters may be a file system path, storage path, or virtual URL.
 893          * When "dispositions" are given they are used as Content-Disposition if supported.
 894          *
 895          * @param $triples Array List of (source path, destination path, disposition)
 896          * @return FileRepoStatus
 897          */
 898         public function quickImportBatch( array $triples ) {
 899                 $status = $this->newGood();
 900                 $operations = array();
 901                 foreach ( $triples as $triple ) {
 902                         list( $src, $dst ) = $triple;
 903                         $src = $this->resolveToStoragePath( $src );
 904                         $dst = $this->resolveToStoragePath( $dst );
 905                         $operations[] = array(
 906                                 'op'          => FileBackend::isStoragePath( $src ) ? 'copy' : 'store',
 907                                 'src'         => $src,
 908                                 'dst'         => $dst,
 909                                 'disposition' => isset( $triple[2] ) ? $triple[2] : null
 910                         );
 911                         $status->merge( $this->initDirectory( dirname( $dst ) ) );
 912                 }
 913                 $status->merge( $this->backend->doQuickOperations( $operations ) );
 914
 915                 return $status;
 916         }
 917
 918         /**
 919          * Purge a batch of files from the repo.
 920          * This function can be used to write to otherwise read-only foreign repos.
 921          * This does no locking nor journaling and is intended for purging thumbnails.
 922          *
 923          * @param $paths Array List of virtual URLs or storage paths
 924          * @return FileRepoStatus
 925          */
 926         public function quickPurgeBatch( array $paths ) {
 927                 $status = $this->newGood();
 928                 $operations = array();
 929                 foreach ( $paths as $path ) {
 930                         $operations[] = array(
 931                                 'op'                  => 'delete',
 932                                 'src'                 => $this->resolveToStoragePath( $path ),
 933                                 'ignoreMissingSource' => true
 934                         );
 935                 }
 936                 $status->merge( $this->backend->doQuickOperations( $operations ) );
 937
 938                 return $status;
 939         }
 940
 941         /**
 942          * Pick a random name in the temp zone and store a file to it.
 943          * Returns a FileRepoStatus object with the file Virtual URL in the value,
 944          * file can later be disposed using FileRepo::freeTemp().
 945          *
 946          * @param $originalName String: the base name of the file as specified
 947          *     by the user. The file extension will be maintained.
 948          * @param $srcPath String: the current location of the file.
 949          * @return FileRepoStatus object with the URL in the value.
 950          */
 951         public function storeTemp( $originalName, $srcPath ) {
 952                 $this->assertWritableRepo(); // fail out if read-only
 953
 954                 $date       = gmdate( "YmdHis" );
 955                 $hashPath   = $this->getHashPath( $originalName );
 956                 $dstRel     = "{$hashPath}{$date}!{$originalName}";
 957                 $dstUrlRel  = $hashPath . $date . '!' . rawurlencode( $originalName );
 958                 $virtualUrl = $this->getVirtualUrl( 'temp' )  . '/' . $dstUrlRel;
 959
 960                 $result = $this->quickImport( $srcPath, $virtualUrl );
 961                 $result->value = $virtualUrl;
 962
 963                 return $result;
 964         }
 965
 966         /**
 967          * Remove a temporary file or mark it for garbage collection
 968          *
 969          * @param $virtualUrl String: the virtual URL returned by FileRepo::storeTemp()
 970          * @return Boolean: true on success, false on failure
 971          */
 972         public function freeTemp( $virtualUrl ) {
 973                 $this->assertWritableRepo(); // fail out if read-only
 974
 975                 $temp = $this->getVirtualUrl( 'temp' );
 976                 if ( substr( $virtualUrl, 0, strlen( $temp ) ) != $temp ) {
 977                         wfDebug( __METHOD__.": Invalid temp virtual URL\n" );
 978                         return false;
 979                 }
 980
 981                 return $this->quickPurge( $virtualUrl )->isOK();
 982         }
 983
 984         /**
 985          * Concatenate a list of temporary files into a target file location.
 986          *
 987          * @param $srcPaths Array Ordered list of source virtual URLs/storage paths
 988          * @param $dstPath String Target file system path
 989          * @param $flags Integer: bitwise combination of the following flags:
 990          *     self::DELETE_SOURCE     Delete the source files
 991          * @param $callback Closure Optional callback function (see FileBackend::concatenate())
 992          * @return FileRepoStatus
 993          */
 994         public function concatenate( array $srcPaths, $dstPath, $flags = 0, Closure $callback = null ) {
 995                 $this->assertWritableRepo(); // fail out if read-only
 996
 997                 $status = $this->newGood();
 998
 999                 $sources = array();
1000                 foreach ( $srcPaths as $srcPath ) {
1001                         // Resolve source to a storage path if virtual
1002                         $source = $this->resolveToStoragePath( $srcPath );
1003                         $sources[] = $source; // chunk to merge
1004                 }
1005
1006                 // Concatenate the chunks into one FS file
1007                 $params = array( 'srcs' => $sources, 'dst' => $dstPath, 'callback' => $callback );
1008                 $status->merge( $this->backend->concatenate( $params ) );
1009                 if ( !$status->isOK() ) {
1010                         return $status;
1011                 }
1012
1013                 // Delete the sources if required
1014                 if ( $flags & self::DELETE_SOURCE ) {
1015                         $status->merge( $this->quickPurgeBatch( $srcPaths ) );
1016                 }
1017
1018                 // Make sure status is OK, despite any quickPurgeBatch() fatals
1019                 $status->setResult( true );
1020
1021                 return $status;
1022         }
1023
1024         /**
1025          * Copy or move a file either from a storage path, virtual URL,
1026          * or file system path, into this repository at the specified destination location.
1027          *
1028          * Returns a FileRepoStatus object. On success, the value contains "new" or
1029          * "archived", to indicate whether the file was new with that name.
1030          *
1031          * Options to $options include:
1032          *   - headers : name/value map of HTTP headers to use in response to GET/HEAD requests
1033          *
1034          * @param $srcPath String: the source file system path, storage path, or URL
1035          * @param $dstRel String: the destination relative path
1036          * @param $archiveRel String: the relative path where the existing file is to
1037          *        be archived, if there is one. Relative to the public zone root.
1038          * @param $flags Integer: bitfield, may be FileRepo::DELETE_SOURCE to indicate
1039          *        that the source file should be deleted if possible
1040          * @param $options Array Optional additional parameters
1041          * @return FileRepoStatus
1042          */
1043         public function publish(
1044                 $srcPath, $dstRel, $archiveRel, $flags = 0, array $options = array()
1045         ) {
1046                 $this->assertWritableRepo(); // fail out if read-only
1047
1048                 $status = $this->publishBatch(
1049                         array( array( $srcPath, $dstRel, $archiveRel, $options ) ), $flags );
1050                 if ( $status->successCount == 0 ) {
1051                         $status->ok = false;
1052                 }
1053                 if ( isset( $status->value[0] ) ) {
1054                         $status->value = $status->value[0];
1055                 } else {
1056                         $status->value = false;
1057                 }
1058
1059                 return $status;
1060         }
1061
1062         /**
1063          * Publish a batch of files
1064          *
1065          * @param $ntuples Array: (source, dest, archive) triplets or
1066          *        (source, dest, archive, options) 4-tuples as per publish().
1067          * @param $flags Integer: bitfield, may be FileRepo::DELETE_SOURCE to indicate
1068          *        that the source files should be deleted if possible
1069          * @throws MWException
1070          * @return FileRepoStatus
1071          */
1072         public function publishBatch( array $ntuples, $flags = 0 ) {
1073                 $this->assertWritableRepo(); // fail out if read-only
1074
1075                 $backend = $this->backend; // convenience
1076                 // Try creating directories
1077                 $status = $this->initZones( 'public' );
1078                 if ( !$status->isOK() ) {
1079                         return $status;
1080                 }
1081
1082                 $status = $this->newGood( array() );
1083
1084                 $operations = array();
1085                 $sourceFSFilesToDelete = array(); // cleanup for disk source files
1086                 // Validate each triplet and get the store operation...
1087                 foreach ( $ntuples as $i => $ntuple ) {
1088                         list( $srcPath, $dstRel, $archiveRel ) = $ntuple;
1089                         $options = isset( $ntuple[3] ) ? $ntuple[3] : array();
1090                         // Resolve source to a storage path if virtual
1091                         $srcPath = $this->resolveToStoragePath( $srcPath );
1092                         if ( !$this->validateFilename( $dstRel ) ) {
1093                                 throw new MWException( 'Validation error in $dstRel' );
1094                         }
1095                         if ( !$this->validateFilename( $archiveRel ) ) {
1096                                 throw new MWException( 'Validation error in $archiveRel' );
1097                         }
1098
1099                         $publicRoot = $this->getZonePath( 'public' );
1100                         $dstPath = "$publicRoot/$dstRel";
1101                         $archivePath = "$publicRoot/$archiveRel";
1102
1103                         $dstDir = dirname( $dstPath );
1104                         $archiveDir = dirname( $archivePath );
1105                         // Abort immediately on directory creation errors since they're likely to be repetitive
1106                         if ( !$this->initDirectory( $dstDir )->isOK() ) {
1107                                 return $this->newFatal( 'directorycreateerror', $dstDir );
1108                         }
1109                         if ( !$this->initDirectory($archiveDir )->isOK() ) {
1110                                 return $this->newFatal( 'directorycreateerror', $archiveDir );
1111                         }
1112
1113                         // Set any desired headers to be use in GET/HEAD responses
1114                         $headers = isset( $options['headers'] ) ? $options['headers'] : array();
1115
1116                         // Archive destination file if it exists.
1117                         // This will check if the archive file also exists and fail if does.
1118                         // This is a sanity check to avoid data loss. On Windows and Linux,
1119                         // copy() will overwrite, so the existence check is vulnerable to
1120                         // race conditions unless an functioning LockManager is used.
1121                         // LocalFile also uses SELECT FOR UPDATE for synchronization.
1122                         $operations[] = array(
1123                                 'op'                  => 'copy',
1124                                 'src'                 => $dstPath,
1125                                 'dst'                 => $archivePath,
1126                                 'ignoreMissingSource' => true
1127                         );
1128
1129                         // Copy (or move) the source file to the destination
1130                         if ( FileBackend::isStoragePath( $srcPath ) ) {
1131                                 if ( $flags & self::DELETE_SOURCE ) {
1132                                         $operations[] = array(
1133                                                 'op'        => 'move',
1134                                                 'src'       => $srcPath,
1135                                                 'dst'       => $dstPath,
1136                                                 'overwrite' => true, // replace current
1137                                                 'headers'   => $headers
1138                                         );
1139                                 } else {
1140                                         $operations[] = array(
1141                                                 'op'        => 'copy',
1142                                                 'src'       => $srcPath,
1143                                                 'dst'       => $dstPath,
1144                                                 'overwrite' => true, // replace current
1145                                                 'headers'   => $headers
1146                                         );
1147                                 }
1148                         } else { // FS source path
1149                                 $operations[] = array(
1150                                         'op'        => 'store',
1151                                         'src'       => $srcPath,
1152                                         'dst'       => $dstPath,
1153                                         'overwrite' => true, // replace current
1154                                         'headers'   => $headers
1155                                 );
1156                                 if ( $flags & self::DELETE_SOURCE ) {
1157                                         $sourceFSFilesToDelete[] = $srcPath;
1158                                 }
1159                         }
1160                 }
1161
1162                 // Execute the operations for each triplet
1163                 $status->merge( $backend->doOperations( $operations ) );
1164                 // Find out which files were archived...
1165                 foreach ( $ntuples as $i => $ntuple ) {
1166                         list( $srcPath, $dstRel, $archiveRel ) = $ntuple;
1167                         $archivePath = $this->getZonePath( 'public' ) . "/$archiveRel";
1168                         if ( $this->fileExists( $archivePath ) ) {
1169                                 $status->value[$i] = 'archived';
1170                         } else {
1171                                 $status->value[$i] = 'new';
1172                         }
1173                 }
1174                 // Cleanup for disk source files...
1175                 foreach ( $sourceFSFilesToDelete as $file ) {
1176                         wfSuppressWarnings();
1177                         unlink( $file ); // FS cleanup
1178                         wfRestoreWarnings();
1179                 }
1180
1181                 return $status;
1182         }
1183
1184         /**
1185          * Creates a directory with the appropriate zone permissions.
1186          * Callers are responsible for doing read-only and "writable repo" checks.
1187          *
1188          * @param $dir string Virtual URL (or storage path) of directory to clean
1189          * @return Status
1190          */
1191         protected function initDirectory( $dir ) {
1192                 $path = $this->resolveToStoragePath( $dir );
1193                 list( $b, $container, $r ) = FileBackend::splitStoragePath( $path );
1194
1195                 $params = array( 'dir' => $path );
1196                 if ( $this->isPrivate || $container === $this->zones['deleted']['container'] ) {
1197                         # Take all available measures to prevent web accessibility of new deleted
1198                         # directories, in case the user has not configured offline storage
1199                         $params = array( 'noAccess' => true, 'noListing' => true ) + $params;
1200                 }
1201
1202                 return $this->backend->prepare( $params );
1203         }
1204
1205         /**
1206          * Deletes a directory if empty.
1207          *
1208          * @param $dir string Virtual URL (or storage path) of directory to clean
1209          * @return Status
1210          */
1211         public function cleanDir( $dir ) {
1212                 $this->assertWritableRepo(); // fail out if read-only
1213
1214                 $status = $this->newGood();
1215                 $status->merge( $this->backend->clean(
1216                         array( 'dir' => $this->resolveToStoragePath( $dir ) ) ) );
1217
1218                 return $status;
1219         }
1220
1221         /**
1222          * Checks existence of a a file
1223          *
1224          * @param $file string Virtual URL (or storage path) of file to check
1225          * @return bool
1226          */
1227         public function fileExists( $file ) {
1228                 $result = $this->fileExistsBatch( array( $file ) );
1229                 return $result[0];
1230         }
1231
1232         /**
1233          * Checks existence of an array of files.
1234          *
1235          * @param $files Array: Virtual URLs (or storage paths) of files to check
1236          * @return array|bool Either array of files and existence flags, or false
1237          */
1238         public function fileExistsBatch( array $files ) {
1239                 $result = array();
1240                 foreach ( $files as $key => $file ) {
1241                         $file = $this->resolveToStoragePath( $file );
1242                         $result[$key] = $this->backend->fileExists( array( 'src' => $file ) );
1243                 }
1244                 return $result;
1245         }
1246
1247         /**
1248          * Move a file to the deletion archive.
1249          * If no valid deletion archive exists, this may either delete the file
1250          * or throw an exception, depending on the preference of the repository
1251          *
1252          * @param $srcRel Mixed: relative path for the file to be deleted
1253          * @param $archiveRel Mixed: relative path for the archive location.
1254          *        Relative to a private archive directory.
1255          * @return FileRepoStatus object
1256          */
1257         public function delete( $srcRel, $archiveRel ) {
1258                 $this->assertWritableRepo(); // fail out if read-only
1259
1260                 return $this->deleteBatch( array( array( $srcRel, $archiveRel ) ) );
1261         }
1262
1263         /**
1264          * Move a group of files to the deletion archive.
1265          *
1266          * If no valid deletion archive is configured, this may either delete the
1267          * file or throw an exception, depending on the preference of the repository.
1268          *
1269          * The overwrite policy is determined by the repository -- currently LocalRepo
1270          * assumes a naming scheme in the deleted zone based on content hash, as
1271          * opposed to the public zone which is assumed to be unique.
1272          *
1273          * @param $sourceDestPairs Array of source/destination pairs. Each element
1274          *        is a two-element array containing the source file path relative to the
1275          *        public root in the first element, and the archive file path relative
1276          *        to the deleted zone root in the second element.
1277          * @throws MWException
1278          * @return FileRepoStatus
1279          */
1280         public function deleteBatch( array $sourceDestPairs ) {
1281                 $this->assertWritableRepo(); // fail out if read-only
1282
1283                 // Try creating directories
1284                 $status = $this->initZones( array( 'public', 'deleted' ) );
1285                 if ( !$status->isOK() ) {
1286                         return $status;
1287                 }
1288
1289                 $status = $this->newGood();
1290
1291                 $backend = $this->backend; // convenience
1292                 $operations = array();
1293                 // Validate filenames and create archive directories
1294                 foreach ( $sourceDestPairs as $pair ) {
1295                         list( $srcRel, $archiveRel ) = $pair;
1296                         if ( !$this->validateFilename( $srcRel ) ) {
1297                                 throw new MWException( __METHOD__.':Validation error in $srcRel' );
1298                         } elseif ( !$this->validateFilename( $archiveRel ) ) {
1299                                 throw new MWException( __METHOD__.':Validation error in $archiveRel' );
1300                         }
1301
1302                         $publicRoot = $this->getZonePath( 'public' );
1303                         $srcPath = "{$publicRoot}/$srcRel";
1304
1305                         $deletedRoot = $this->getZonePath( 'deleted' );
1306                         $archivePath = "{$deletedRoot}/{$archiveRel}";
1307                         $archiveDir = dirname( $archivePath ); // does not touch FS
1308
1309                         // Create destination directories
1310                         if ( !$this->initDirectory( $archiveDir )->isOK() ) {
1311                                 return $this->newFatal( 'directorycreateerror', $archiveDir );
1312                         }
1313
1314                         $operations[] = array(
1315                                 'op'            => 'move',
1316                                 'src'           => $srcPath,
1317                                 'dst'           => $archivePath,
1318                                 // We may have 2+ identical files being deleted,
1319                                 // all of which will map to the same destination file
1320                                 'overwriteSame' => true // also see bug 31792
1321                         );
1322                 }
1323
1324                 // Move the files by execute the operations for each pair.
1325                 // We're now committed to returning an OK result, which will
1326                 // lead to the files being moved in the DB also.
1327                 $opts = array( 'force' => true );
1328                 $status->merge( $backend->doOperations( $operations, $opts ) );
1329
1330                 return $status;
1331         }
1332
1333         /**
1334          * Delete files in the deleted directory if they are not referenced in the filearchive table
1335          *
1336          * STUB
1337          */
1338         public function cleanupDeletedBatch( array $storageKeys ) {
1339                 $this->assertWritableRepo();
1340         }
1341
1342         /**
1343          * Get a relative path for a deletion archive key,
1344          * e.g. s/z/a/ for sza251lrxrc1jad41h5mgilp8nysje52.jpg
1345          *
1346          * @param $key string
1347          * @throws MWException
1348          * @return string
1349          */
1350         public function getDeletedHashPath( $key ) {
1351                 if ( strlen( $key ) < 31 ) {
1352                         throw new MWException( "Invalid storage key '$key'." );
1353                 }
1354                 $path = '';
1355                 for ( $i = 0; $i < $this->deletedHashLevels; $i++ ) {
1356                         $path .= $key[$i] . '/';
1357                 }
1358                 return $path;
1359         }
1360
1361         /**
1362          * If a path is a virtual URL, resolve it to a storage path.
1363          * Otherwise, just return the path as it is.
1364          *
1365          * @param $path string
1366          * @return string
1367          * @throws MWException
1368          */
1369         protected function resolveToStoragePath( $path ) {
1370                 if ( $this->isVirtualUrl( $path ) ) {
1371                         return $this->resolveVirtualUrl( $path );
1372                 }
1373                 return $path;
1374         }
1375
1376         /**
1377          * Get a local FS copy of a file with a given virtual URL/storage path.
1378          * Temporary files may be purged when the file object falls out of scope.
1379          *
1380          * @param $virtualUrl string
1381          * @return TempFSFile|null Returns null on failure
1382          */
1383         public function getLocalCopy( $virtualUrl ) {
1384                 $path = $this->resolveToStoragePath( $virtualUrl );
1385                 return $this->backend->getLocalCopy( array( 'src' => $path ) );
1386         }
1387
1388         /**
1389          * Get a local FS file with a given virtual URL/storage path.
1390          * The file is either an original or a copy. It should not be changed.
1391          * Temporary files may be purged when the file object falls out of scope.
1392          *
1393          * @param $virtualUrl string
1394          * @return FSFile|null Returns null on failure.
1395          */
1396         public function getLocalReference( $virtualUrl ) {
1397                 $path = $this->resolveToStoragePath( $virtualUrl );
1398                 return $this->backend->getLocalReference( array( 'src' => $path ) );
1399         }
1400
1401         /**
1402          * Get properties of a file with a given virtual URL/storage path.
1403          * Properties should ultimately be obtained via FSFile::getProps().
1404          *
1405          * @param $virtualUrl string
1406          * @return Array
1407          */
1408         public function getFileProps( $virtualUrl ) {
1409                 $path = $this->resolveToStoragePath( $virtualUrl );
1410                 return $this->backend->getFileProps( array( 'src' => $path ) );
1411         }
1412
1413         /**
1414          * Get the timestamp of a file with a given virtual URL/storage path
1415          *
1416          * @param $virtualUrl string
1417          * @return string|bool False on failure
1418          */
1419         public function getFileTimestamp( $virtualUrl ) {
1420                 $path = $this->resolveToStoragePath( $virtualUrl );
1421                 return $this->backend->getFileTimestamp( array( 'src' => $path ) );
1422         }
1423
1424         /**
1425          * Get the size of a file with a given virtual URL/storage path
1426          *
1427          * @param $virtualUrl string
1428          * @return integer|bool False on failure
1429          */
1430         public function getFileSize( $virtualUrl ) {
1431                 $path = $this->resolveToStoragePath( $virtualUrl );
1432                 return $this->backend->getFileSize( array( 'src' => $path ) );
1433         }
1434
1435         /**
1436          * Get the sha1 (base 36) of a file with a given virtual URL/storage path
1437          *
1438          * @param $virtualUrl string
1439          * @return string|bool
1440          */
1441         public function getFileSha1( $virtualUrl ) {
1442                 $path = $this->resolveToStoragePath( $virtualUrl );
1443                 return $this->backend->getFileSha1Base36( array( 'src' => $path ) );
1444         }
1445
1446         /**
1447          * Attempt to stream a file with the given virtual URL/storage path
1448          *
1449          * @param $virtualUrl string
1450          * @param $headers Array Additional HTTP headers to send on success
1451          * @return bool Success
1452          */
1453         public function streamFile( $virtualUrl, $headers = array() ) {
1454                 $path = $this->resolveToStoragePath( $virtualUrl );
1455                 $params = array( 'src' => $path, 'headers' => $headers );
1456                 return $this->backend->streamFile( $params )->isOK();
1457         }
1458
1459         /**
1460          * Call a callback function for every public regular file in the repository.
1461          * This only acts on the current version of files, not any old versions.
1462          * May use either the database or the filesystem.
1463          *
1464          * @param $callback Array|string
1465          * @return void
1466          */
1467         public function enumFiles( $callback ) {
1468                 $this->enumFilesInStorage( $callback );
1469         }
1470
1471         /**
1472          * Call a callback function for every public file in the repository.
1473          * May use either the database or the filesystem.
1474          *
1475          * @param $callback Array|string
1476          * @return void
1477          */
1478         protected function enumFilesInStorage( $callback ) {
1479                 $publicRoot = $this->getZonePath( 'public' );
1480                 $numDirs = 1 << ( $this->hashLevels * 4 );
1481                 // Use a priori assumptions about directory structure
1482                 // to reduce the tree height of the scanning process.
1483                 for ( $flatIndex = 0; $flatIndex < $numDirs; $flatIndex++ ) {
1484                         $hexString = sprintf( "%0{$this->hashLevels}x", $flatIndex );
1485                         $path = $publicRoot;
1486                         for ( $hexPos = 0; $hexPos < $this->hashLevels; $hexPos++ ) {
1487                                 $path .= '/' . substr( $hexString, 0, $hexPos + 1 );
1488                         }
1489                         $iterator = $this->backend->getFileList( array( 'dir' => $path ) );
1490                         foreach ( $iterator as $name ) {
1491                                 // Each item returned is a public file
1492                                 call_user_func( $callback, "{$path}/{$name}" );
1493                         }
1494                 }
1495         }
1496
1497         /**
1498          * Determine if a relative path is valid, i.e. not blank or involving directory traveral
1499          *
1500          * @param $filename string
1501          * @return bool
1502          */
1503         public function validateFilename( $filename ) {
1504                 if ( strval( $filename ) == '' ) {
1505                         return false;
1506                 }
1507                 return FileBackend::isPathTraversalFree( $filename );
1508         }
1509
1510         /**
1511          * Get a callback function to use for cleaning error message parameters
1512          *
1513          * @return Array
1514          */
1515         function getErrorCleanupFunction() {
1516                 switch ( $this->pathDisclosureProtection ) {
1517                         case 'none':
1518                         case 'simple': // b/c
1519                                 $callback = array( $this, 'passThrough' );
1520                                 break;
1521                         default: // 'paranoid'
1522                                 $callback = array( $this, 'paranoidClean' );
1523                 }
1524                 return $callback;
1525         }
1526
1527         /**
1528          * Path disclosure protection function
1529          *
1530          * @param $param string
1531          * @return string
1532          */
1533         function paranoidClean( $param ) {
1534                 return '[hidden]';
1535         }
1536
1537         /**
1538          * Path disclosure protection function
1539          *
1540          * @param $param string
1541          * @return string
1542          */
1543         function passThrough( $param ) {
1544                 return $param;
1545         }
1546
1547         /**
1548          * Create a new fatal error
1549          *
1550          * @return FileRepoStatus
1551          */
1552         public function newFatal( $message /*, parameters...*/ ) {
1553                 $params = func_get_args();
1554                 array_unshift( $params, $this );
1555                 return MWInit::callStaticMethod( 'FileRepoStatus', 'newFatal', $params );
1556         }
1557
1558         /**
1559          * Create a new good result
1560          *
1561          * @param $value null|string
1562          * @return FileRepoStatus
1563          */
1564         public function newGood( $value = null ) {
1565                 return FileRepoStatus::newGood( $this, $value );
1566         }
1567
1568         /**
1569          * Checks if there is a redirect named as $title. If there is, return the
1570          * title object. If not, return false.
1571          * STUB
1572          *
1573          * @param $title Title of image
1574          * @return Bool
1575          */
1576         public function checkRedirect( Title $title ) {
1577                 return false;
1578         }
1579
1580         /**
1581          * Invalidates image redirect cache related to that image
1582          * Doesn't do anything for repositories that don't support image redirects.
1583          *
1584          * STUB
1585          * @param $title Title of image
1586          */
1587         public function invalidateImageRedirect( Title $title ) {}
1588
1589         /**
1590          * Get the human-readable name of the repo
1591          *
1592          * @return string
1593          */
1594         public function getDisplayName() {
1595                 // We don't name our own repo, return nothing
1596                 if ( $this->isLocal() ) {
1597                         return null;
1598                 }
1599                 // 'shared-repo-name-wikimediacommons' is used when $wgUseInstantCommons = true
1600                 return wfMessageFallback( 'shared-repo-name-' . $this->name, 'shared-repo' )->text();
1601         }
1602
1603         /**
1604          * Get the portion of the file that contains the origin file name.
1605          * If that name is too long, then the name "thumbnail.<ext>" will be given.
1606          *
1607          * @param $name string
1608          * @return string
1609          */
1610         public function nameForThumb( $name ) {
1611                 if ( strlen( $name ) > $this->abbrvThreshold ) {
1612                         $ext  = FileBackend::extensionFromPath( $name );
1613                         $name = ( $ext == '' ) ? 'thumbnail' : "thumbnail.$ext";
1614                 }
1615                 return $name;
1616         }
1617
1618         /**
1619          * Returns true if this the local file repository.
1620          *
1621          * @return bool
1622          */
1623         public function isLocal() {
1624                 return $this->getName() == 'local';
1625         }
1626
1627         /**
1628          * Get a key on the primary cache for this repository.
1629          * Returns false if the repository's cache is not accessible at this site.
1630          * The parameters are the parts of the key, as for wfMemcKey().
1631          *
1632          * STUB
1633          * @return bool
1634          */
1635         public function getSharedCacheKey( /*...*/ ) {
1636                 return false;
1637         }
1638
1639         /**
1640          * Get a key for this repo in the local cache domain. These cache keys are
1641          * not shared with remote instances of the repo.
1642          * The parameters are the parts of the key, as for wfMemcKey().
1643          *
1644          * @return string
1645          */
1646         public function getLocalCacheKey( /*...*/ ) {
1647                 $args = func_get_args();
1648                 array_unshift( $args, 'filerepo', $this->getName() );
1649                 return call_user_func_array( 'wfMemcKey', $args );
1650         }
1651
1652         /**
1653          * Get an temporary FileRepo associated with this repo.
1654          * Files will be created in the temp zone of this repo and
1655          * thumbnails in a /temp subdirectory in thumb zone of this repo.
1656          * It will have the same backend as this repo.
1657          *
1658          * @return TempFileRepo
1659          */
1660         public function getTempRepo() {
1661                 return new TempFileRepo( array(
1662                         'name'      => "{$this->name}-temp",
1663                         'backend'   => $this->backend,
1664                         'zones'     => array(
1665                                 'public' => array(
1666                                         'container' => $this->zones['temp']['container'],
1667                                         'directory' => $this->zones['temp']['directory']
1668                                 ),
1669                                 'thumb'  => array(
1670                                         'container' => $this->zones['thumb']['container'],
1671                                         'directory' => ( $this->zones['thumb']['directory'] == '' )
1672                                                 ? 'temp'
1673                                                 : $this->zones['thumb']['directory'] . '/temp'
1674                                 )
1675                         ),
1676                         'url'        => $this->getZoneUrl( 'temp' ),
1677                         'thumbUrl'   => $this->getZoneUrl( 'thumb' ) . '/temp',
1678                         'hashLevels' => $this->hashLevels // performance
1679                 ) );
1680         }
1681
1682         /**
1683          * Get an UploadStash associated with this repo.
1684          *
1685          * @return UploadStash
1686          */
1687         public function getUploadStash() {
1688                 return new UploadStash( $this );
1689         }
1690
1691         /**
1692          * Throw an exception if this repo is read-only by design.
1693          * This does not and should not check getReadOnlyReason().
1694          *
1695          * @return void
1696          * @throws MWException
1697          */
1698         protected function assertWritableRepo() {}
1699 }
1700
1701 /**
1702  * FileRepo for temporary files created via FileRepo::getTempRepo()
1703  */
1704 class TempFileRepo extends FileRepo {
1705         public function getTempRepo() {
1706                 throw new MWException( "Cannot get a temp repo from a temp repo." );
1707         }
1708 }