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  * @file
  14  * @ingroup FileRepo
  15  */
  16
  17 /**
  18  * Base class for file repositories
  19  *
  20  * @ingroup FileRepo
  21  */
  22 class FileRepo {
  23         const DELETE_SOURCE = 1;
  24         const OVERWRITE = 2;
  25         const OVERWRITE_SAME = 4;
  26         const SKIP_LOCKING = 8;
  27
  28         /** @var FileBackend */
  29         protected $backend;
  30         /** @var Array Map of zones to config */
  31         protected $zones = array();
  32
  33         var $thumbScriptUrl, $transformVia404;
  34         var $descBaseUrl, $scriptDirUrl, $scriptExtension, $articleUrl;
  35         var $fetchDescription, $initialCapital;
  36         var $pathDisclosureProtection = 'simple'; // 'paranoid'
  37         var $descriptionCacheExpiry, $url, $thumbUrl;
  38         var $hashLevels, $deletedHashLevels;
  39
  40         /**
  41          * Factory functions for creating new files
  42          * Override these in the base class
  43          */
  44         var $fileFactory = array( 'UnregisteredLocalFile', 'newFromTitle' );
  45         var $oldFileFactory = false;
  46         var $fileFactoryKey = false, $oldFileFactoryKey = false;
  47
  48         function __construct( array $info = null ) {
  49                 // Verify required settings presence
  50                 if(
  51                         $info === null
  52                         || !array_key_exists( 'name', $info )
  53                         || !array_key_exists( 'backend', $info )
  54                 ) {
  55                         throw new MWException( __CLASS__ . " requires an array of options having both 'name' and 'backend' keys.\n" );
  56                 }
  57
  58                 // Required settings
  59                 $this->name = $info['name'];
  60                 if ( $info['backend'] instanceof FileBackend ) {
  61                         $this->backend = $info['backend']; // useful for testing
  62                 } else {
  63                         $this->backend = FileBackendGroup::singleton()->get( $info['backend'] );
  64                 }
  65
  66                 // Optional settings that can have no value
  67                 $optionalSettings = array(
  68                         'descBaseUrl', 'scriptDirUrl', 'articleUrl', 'fetchDescription',
  69                         'thumbScriptUrl', 'pathDisclosureProtection', 'descriptionCacheExpiry',
  70                         'scriptExtension'
  71                 );
  72                 foreach ( $optionalSettings as $var ) {
  73                         if ( isset( $info[$var] ) ) {
  74                                 $this->$var = $info[$var];
  75                         }
  76                 }
  77
  78                 // Optional settings that have a default
  79                 $this->initialCapital = isset( $info['initialCapital'] )
  80                         ? $info['initialCapital']
  81                         : MWNamespace::isCapitalized( NS_FILE );
  82                 $this->url = isset( $info['url'] )
  83                         ? $info['url']
  84                         : false; // a subclass may set the URL (e.g. ForeignAPIRepo)
  85                 if ( isset( $info['thumbUrl'] ) ) {
  86                         $this->thumbUrl = $info['thumbUrl'];
  87                 } else {
  88                         $this->thumbUrl = $this->url ? "{$this->url}/thumb" : false;
  89                 }
  90                 $this->hashLevels = isset( $info['hashLevels'] )
  91                         ? $info['hashLevels']
  92                         : 2;
  93                 $this->deletedHashLevels = isset( $info['deletedHashLevels'] )
  94                         ? $info['deletedHashLevels']
  95                         : $this->hashLevels;
  96                 $this->transformVia404 = !empty( $info['transformVia404'] );
  97                 $this->zones = isset( $info['zones'] )
  98                         ? $info['zones']
  99                         : array();
 100                 // Give defaults for the basic zones...
 101                 foreach ( array( 'public', 'thumb', 'temp', 'deleted' ) as $zone ) {
 102                         if ( !isset( $this->zones[$zone] ) ) {
 103                                 $this->zones[$zone] = array(
 104                                         'container' => "{$this->name}-{$zone}",
 105                                         'directory' => '' // container root
 106                                 );
 107                         }
 108                 }
 109         }
 110
 111         /**
 112          * Get the file backend instance. Use this function wisely.
 113          *
 114          * @return FileBackend
 115          */
 116         public function getBackend() {
 117                 return $this->backend;
 118         }
 119
 120         /**
 121          * Get an explanatory message if this repo is read-only.
 122          * This checks if an administrator disabled writes to the backend.
 123          *
 124          * @return string|bool Returns false if the repo is not read-only
 125          */
 126         public function getReadOnlyReason() {
 127                 return $this->backend->getReadOnlyReason();
 128         }
 129
 130         /**
 131          * Check if a single zone or list of zones is defined for usage
 132          *
 133          * @param $doZones Array Only do a particular zones
 134          * @return Status
 135          */
 136         protected function initZones( $doZones = array() ) {
 137                 $status = $this->newGood();
 138                 foreach ( (array)$doZones as $zone ) {
 139                         $root = $this->getZonePath( $zone );
 140                         if ( $root === null ) {
 141                                 throw new MWException( "No '$zone' zone defined in the {$this->name} repo." );
 142                         }
 143                 }
 144                 return $status;
 145         }
 146
 147         /**
 148          * Take all available measures to prevent web accessibility of new deleted
 149          * directories, in case the user has not configured offline storage
 150          *
 151          * @param $dir string
 152          * @return void
 153          */
 154         protected function initDeletedDir( $dir ) {
 155                 $this->backend->secure( // prevent web access & dir listings
 156                         array( 'dir' => $dir, 'noAccess' => true, 'noListing' => true ) );
 157         }
 158
 159         /**
 160          * Determine if a string is an mwrepo:// URL
 161          *
 162          * @param $url string
 163          * @return bool
 164          */
 165         public static function isVirtualUrl( $url ) {
 166                 return substr( $url, 0, 9 ) == 'mwrepo://';
 167         }
 168
 169         /**
 170          * Get a URL referring to this repository, with the private mwrepo protocol.
 171          * The suffix, if supplied, is considered to be unencoded, and will be
 172          * URL-encoded before being returned.
 173          *
 174          * @param $suffix string
 175          * @return string
 176          */
 177         public function getVirtualUrl( $suffix = false ) {
 178                 $path = 'mwrepo://' . $this->name;
 179                 if ( $suffix !== false ) {
 180                         $path .= '/' . rawurlencode( $suffix );
 181                 }
 182                 return $path;
 183         }
 184
 185         /**
 186          * Get the URL corresponding to one of the four basic zones
 187          *
 188          * @param $zone String: one of: public, deleted, temp, thumb
 189          * @return String or false
 190          */
 191         public function getZoneUrl( $zone ) {
 192                 switch ( $zone ) {
 193                         case 'public':
 194                                 return $this->url;
 195                         case 'temp':
 196                                 return "{$this->url}/temp";
 197                         case 'deleted':
 198                                 return false; // no public URL
 199                         case 'thumb':
 200                                 return $this->thumbUrl;
 201                         default:
 202                                 return false;
 203                 }
 204         }
 205
 206         /**
 207          * Get the backend storage path corresponding to a virtual URL.
 208          * Use this function wisely.
 209          *
 210          * @param $url string
 211          * @return string
 212          */
 213         public function resolveVirtualUrl( $url ) {
 214                 if ( substr( $url, 0, 9 ) != 'mwrepo://' ) {
 215                         throw new MWException( __METHOD__.': unknown protocol' );
 216                 }
 217                 $bits = explode( '/', substr( $url, 9 ), 3 );
 218                 if ( count( $bits ) != 3 ) {
 219                         throw new MWException( __METHOD__.": invalid mwrepo URL: $url" );
 220                 }
 221                 list( $repo, $zone, $rel ) = $bits;
 222                 if ( $repo !== $this->name ) {
 223                         throw new MWException( __METHOD__.": fetching from a foreign repo is not supported" );
 224                 }
 225                 $base = $this->getZonePath( $zone );
 226                 if ( !$base ) {
 227                         throw new MWException( __METHOD__.": invalid zone: $zone" );
 228                 }
 229                 return $base . '/' . rawurldecode( $rel );
 230         }
 231
 232         /**
 233          * The the storage container and base path of a zone
 234          *
 235          * @param $zone string
 236          * @return Array (container, base path) or (null, null)
 237          */
 238         protected function getZoneLocation( $zone ) {
 239                 if ( !isset( $this->zones[$zone] ) ) {
 240                         return array( null, null ); // bogus
 241                 }
 242                 return array( $this->zones[$zone]['container'], $this->zones[$zone]['directory'] );
 243         }
 244
 245         /**
 246          * Get the storage path corresponding to one of the zones
 247          *
 248          * @param $zone string
 249          * @return string|null Returns null if the zone is not defined
 250          */
 251         public function getZonePath( $zone ) {
 252                 list( $container, $base ) = $this->getZoneLocation( $zone );
 253                 if ( $container === null || $base === null ) {
 254                         return null;
 255                 }
 256                 $backendName = $this->backend->getName();
 257                 if ( $base != '' ) { // may not be set
 258                         $base = "/{$base}";
 259                 }
 260                 return "mwstore://$backendName/{$container}{$base}";
 261         }
 262
 263         /**
 264          * Create a new File object from the local repository
 265          *
 266          * @param $title Mixed: Title object or string
 267          * @param $time Mixed: Time at which the image was uploaded.
 268          *              If this is specified, the returned object will be an
 269          *              instance of the repository's old file class instead of a
 270          *              current file. Repositories not supporting version control
 271          *              should return false if this parameter is set.
 272          * @return File|null A File, or null if passed an invalid Title
 273          */
 274         public function newFile( $title, $time = false ) {
 275                 $title = File::normalizeTitle( $title );
 276                 if ( !$title ) {
 277                         return null;
 278                 }
 279                 if ( $time ) {
 280                         if ( $this->oldFileFactory ) {
 281                                 return call_user_func( $this->oldFileFactory, $title, $this, $time );
 282                         } else {
 283                                 return false;
 284                         }
 285                 } else {
 286                         return call_user_func( $this->fileFactory, $title, $this );
 287                 }
 288         }
 289
 290         /**
 291          * Find an instance of the named file created at the specified time
 292          * Returns false if the file does not exist. Repositories not supporting
 293          * version control should return false if the time is specified.
 294          *
 295          * @param $title Mixed: Title object or string
 296          * @param $options array Associative array of options:
 297          *     time:           requested time for a specific file version, or false for the
 298          *                     current version. An image object will be returned which was
 299          *                     created at the specified time (which may be archived or current).
 300          *
 301          *     ignoreRedirect: If true, do not follow file redirects
 302          *
 303          *     private:        If true, return restricted (deleted) files if the current
 304          *                     user is allowed to view them. Otherwise, such files will not
 305          *                     be found.
 306          * @return File|bool False on failure
 307          */
 308         public function findFile( $title, $options = array() ) {
 309                 $title = File::normalizeTitle( $title );
 310                 if ( !$title ) {
 311                         return false;
 312                 }
 313                 $time = isset( $options['time'] ) ? $options['time'] : false;
 314                 # First try the current version of the file to see if it precedes the timestamp
 315                 $img = $this->newFile( $title );
 316                 if ( !$img ) {
 317                         return false;
 318                 }
 319                 if ( $img->exists() && ( !$time || $img->getTimestamp() == $time ) ) {
 320                         return $img;
 321                 }
 322                 # Now try an old version of the file
 323                 if ( $time !== false ) {
 324                         $img = $this->newFile( $title, $time );
 325                         if ( $img && $img->exists() ) {
 326                                 if ( !$img->isDeleted( File::DELETED_FILE ) ) {
 327                                         return $img; // always OK
 328                                 } elseif ( !empty( $options['private'] ) && $img->userCan( File::DELETED_FILE ) ) {
 329                                         return $img;
 330                                 }
 331                         }
 332                 }
 333
 334                 # Now try redirects
 335                 if ( !empty( $options['ignoreRedirect'] ) ) {
 336                         return false;
 337                 }
 338                 $redir = $this->checkRedirect( $title );
 339                 if ( $redir && $title->getNamespace() == NS_FILE) {
 340                         $img = $this->newFile( $redir );
 341                         if ( !$img ) {
 342                                 return false;
 343                         }
 344                         if ( $img->exists() ) {
 345                                 $img->redirectedFrom( $title->getDBkey() );
 346                                 return $img;
 347                         }
 348                 }
 349                 return false;
 350         }
 351
 352         /**
 353          * Find many files at once.
 354          *
 355          * @param $items array An array of titles, or an array of findFile() options with
 356          *    the "title" option giving the title. Example:
 357          *
 358          *     $findItem = array( 'title' => $title, 'private' => true );
 359          *     $findBatch = array( $findItem );
 360          *     $repo->findFiles( $findBatch );
 361          * @return array
 362          */
 363         public function findFiles( array $items ) {
 364                 $result = array();
 365                 foreach ( $items as $item ) {
 366                         if ( is_array( $item ) ) {
 367                                 $title = $item['title'];
 368                                 $options = $item;
 369                                 unset( $options['title'] );
 370                         } else {
 371                                 $title = $item;
 372                                 $options = array();
 373                         }
 374                         $file = $this->findFile( $title, $options );
 375                         if ( $file ) {
 376                                 $result[$file->getTitle()->getDBkey()] = $file;
 377                         }
 378                 }
 379                 return $result;
 380         }
 381
 382         /**
 383          * Find an instance of the file with this key, created at the specified time
 384          * Returns false if the file does not exist. Repositories not supporting
 385          * version control should return false if the time is specified.
 386          *
 387          * @param $sha1 String base 36 SHA-1 hash
 388          * @param $options array Option array, same as findFile().
 389          * @return File|bool False on failure
 390          */
 391         public function findFileFromKey( $sha1, $options = array() ) {
 392                 $time = isset( $options['time'] ) ? $options['time'] : false;
 393                 # First try to find a matching current version of a file...
 394                 if ( $this->fileFactoryKey ) {
 395                         $img = call_user_func( $this->fileFactoryKey, $sha1, $this, $time );
 396                 } else {
 397                         return false; // find-by-sha1 not supported
 398                 }
 399                 if ( $img && $img->exists() ) {
 400                         return $img;
 401                 }
 402                 # Now try to find a matching old version of a file...
 403                 if ( $time !== false && $this->oldFileFactoryKey ) { // find-by-sha1 supported?
 404                         $img = call_user_func( $this->oldFileFactoryKey, $sha1, $this, $time );
 405                         if ( $img && $img->exists() ) {
 406                                 if ( !$img->isDeleted( File::DELETED_FILE ) ) {
 407                                         return $img; // always OK
 408                                 } elseif ( !empty( $options['private'] ) && $img->userCan( File::DELETED_FILE ) ) {
 409                                         return $img;
 410                                 }
 411                         }
 412                 }
 413                 return false;
 414         }
 415
 416         /**
 417          * Get an array or iterator of file objects for files that have a given
 418          * SHA-1 content hash.
 419          *
 420          * STUB
 421          * @return array
 422          */
 423         public function findBySha1( $hash ) {
 424                 return array();
 425         }
 426
 427         /**
 428          * Get the public root URL of the repository
 429          *
 430          * @return string
 431          */
 432         public function getRootUrl() {
 433                 return $this->url;
 434         }
 435
 436         /**
 437          * Get the URL of thumb.php
 438          *
 439          * @return string
 440          */
 441         public function getThumbScriptUrl() {
 442                 return $this->thumbScriptUrl;
 443         }
 444
 445         /**
 446          * Returns true if the repository can transform files via a 404 handler
 447          *
 448          * @return bool
 449          */
 450         public function canTransformVia404() {
 451                 return $this->transformVia404;
 452         }
 453
 454         /**
 455          * Get the name of an image from its title object
 456          *
 457          * @param $title Title
 458          * @return String
 459          */
 460         public function getNameFromTitle( Title $title ) {
 461                 global $wgContLang;
 462                 if ( $this->initialCapital != MWNamespace::isCapitalized( NS_FILE ) ) {
 463                         $name = $title->getUserCaseDBKey();
 464                         if ( $this->initialCapital ) {
 465                                 $name = $wgContLang->ucfirst( $name );
 466                         }
 467                 } else {
 468                         $name = $title->getDBkey();
 469                 }
 470                 return $name;
 471         }
 472
 473         /**
 474          * Get the public zone root storage directory of the repository
 475          *
 476          * @return string
 477          */
 478         public function getRootDirectory() {
 479                 return $this->getZonePath( 'public' );
 480         }
 481
 482         /**
 483          * Get a relative path including trailing slash, e.g. f/fa/
 484          * If the repo is not hashed, returns an empty string
 485          *
 486          * @param $name string Name of file
 487          * @return string
 488          */
 489         public function getHashPath( $name ) {
 490                 return self::getHashPathForLevel( $name, $this->hashLevels );
 491         }
 492
 493         /**
 494          * Get a relative path including trailing slash, e.g. f/fa/
 495          * If the repo is not hashed, returns an empty string
 496          *
 497          * @param $suffix string Basename of file from FileRepo::storeTemp()
 498          * @return string
 499          */
 500         public function getTempHashPath( $suffix ) {
 501                 $parts = explode( '!', $suffix, 2 ); // format is <timestamp>!<name> or just <name>
 502                 $name = isset( $parts[1] ) ? $parts[1] : $suffix; // hash path is not based on timestamp
 503                 return self::getHashPathForLevel( $name, $this->hashLevels );
 504         }
 505
 506         /**
 507          * @param $name
 508          * @param $levels
 509          * @return string
 510          */
 511         protected static function getHashPathForLevel( $name, $levels ) {
 512                 if ( $levels == 0 ) {
 513                         return '';
 514                 } else {
 515                         $hash = md5( $name );
 516                         $path = '';
 517                         for ( $i = 1; $i <= $levels; $i++ ) {
 518                                 $path .= substr( $hash, 0, $i ) . '/';
 519                         }
 520                         return $path;
 521                 }
 522         }
 523
 524         /**
 525          * Get the number of hash directory levels
 526          *
 527          * @return integer
 528          */
 529         public function getHashLevels() {
 530                 return $this->hashLevels;
 531         }
 532
 533         /**
 534          * Get the name of this repository, as specified by $info['name]' to the constructor
 535          *
 536          * @return string
 537          */
 538         public function getName() {
 539                 return $this->name;
 540         }
 541
 542         /**
 543          * Make an url to this repo
 544          *
 545          * @param $query mixed Query string to append
 546          * @param $entry string Entry point; defaults to index
 547          * @return string|bool False on failure
 548          */
 549         public function makeUrl( $query = '', $entry = 'index' ) {
 550                 if ( isset( $this->scriptDirUrl ) ) {
 551                         $ext = isset( $this->scriptExtension ) ? $this->scriptExtension : '.php';
 552                         return wfAppendQuery( "{$this->scriptDirUrl}/{$entry}{$ext}", $query );
 553                 }
 554                 return false;
 555         }
 556
 557         /**
 558          * Get the URL of an image description page. May return false if it is
 559          * unknown or not applicable. In general this should only be called by the
 560          * File class, since it may return invalid results for certain kinds of
 561          * repositories. Use File::getDescriptionUrl() in user code.
 562          *
 563          * In particular, it uses the article paths as specified to the repository
 564          * constructor, whereas local repositories use the local Title functions.
 565          *
 566          * @param $name string
 567          * @return string
 568          */
 569         public function getDescriptionUrl( $name ) {
 570                 $encName = wfUrlencode( $name );
 571                 if ( !is_null( $this->descBaseUrl ) ) {
 572                         # "http://example.com/wiki/Image:"
 573                         return $this->descBaseUrl . $encName;
 574                 }
 575                 if ( !is_null( $this->articleUrl ) ) {
 576                         # "http://example.com/wiki/$1"
 577                         #
 578                         # We use "Image:" as the canonical namespace for
 579                         # compatibility across all MediaWiki versions.
 580                         return str_replace( '$1',
 581                                 "Image:$encName", $this->articleUrl );
 582                 }
 583                 if ( !is_null( $this->scriptDirUrl ) ) {
 584                         # "http://example.com/w"
 585                         #
 586                         # We use "Image:" as the canonical namespace for
 587                         # compatibility across all MediaWiki versions,
 588                         # and just sort of hope index.php is right. ;)
 589                         return $this->makeUrl( "title=Image:$encName" );
 590                 }
 591                 return false;
 592         }
 593
 594         /**
 595          * Get the URL of the content-only fragment of the description page. For
 596          * MediaWiki this means action=render. This should only be called by the
 597          * repository's file class, since it may return invalid results. User code
 598          * should use File::getDescriptionText().
 599          *
 600          * @param $name String: name of image to fetch
 601          * @param $lang String: language to fetch it in, if any.
 602          * @return string
 603          */
 604         public function getDescriptionRenderUrl( $name, $lang = null ) {
 605                 $query = 'action=render';
 606                 if ( !is_null( $lang ) ) {
 607                         $query .= '&uselang=' . $lang;
 608                 }
 609                 if ( isset( $this->scriptDirUrl ) ) {
 610                         return $this->makeUrl(
 611                                 'title=' .
 612                                 wfUrlencode( 'Image:' . $name ) .
 613                                 "&$query" );
 614                 } else {
 615                         $descUrl = $this->getDescriptionUrl( $name );
 616                         if ( $descUrl ) {
 617                                 return wfAppendQuery( $descUrl, $query );
 618                         } else {
 619                                 return false;
 620                         }
 621                 }
 622         }
 623
 624         /**
 625          * Get the URL of the stylesheet to apply to description pages
 626          *
 627          * @return string|bool False on failure
 628          */
 629         public function getDescriptionStylesheetUrl() {
 630                 if ( isset( $this->scriptDirUrl ) ) {
 631                         return $this->makeUrl( 'title=MediaWiki:Filepage.css&' .
 632                                 wfArrayToCGI( Skin::getDynamicStylesheetQuery() ) );
 633                 }
 634                 return false;
 635         }
 636
 637         /**
 638          * Store a file to a given destination.
 639          *
 640          * @param $srcPath String: source FS path, storage path, or virtual URL
 641          * @param $dstZone String: destination zone
 642          * @param $dstRel String: destination relative path
 643          * @param $flags Integer: bitwise combination of the following flags:
 644          *     self::DELETE_SOURCE     Delete the source file after upload
 645          *     self::OVERWRITE         Overwrite an existing destination file instead of failing
 646          *     self::OVERWRITE_SAME    Overwrite the file if the destination exists and has the
 647          *                             same contents as the source
 648          *     self::SKIP_LOCKING      Skip any file locking when doing the store
 649          * @return FileRepoStatus
 650          */
 651         public function store( $srcPath, $dstZone, $dstRel, $flags = 0 ) {
 652                 $this->assertWritableRepo(); // fail out if read-only
 653
 654                 $status = $this->storeBatch( array( array( $srcPath, $dstZone, $dstRel ) ), $flags );
 655                 if ( $status->successCount == 0 ) {
 656                         $status->ok = false;
 657                 }
 658
 659                 return $status;
 660         }
 661
 662         /**
 663          * Store a batch of files
 664          *
 665          * @param $triplets Array: (src, dest zone, dest rel) triplets as per store()
 666          * @param $flags Integer: bitwise combination of the following flags:
 667          *     self::DELETE_SOURCE     Delete the source file after upload
 668          *     self::OVERWRITE         Overwrite an existing destination file instead of failing
 669          *     self::OVERWRITE_SAME    Overwrite the file if the destination exists and has the
 670          *                             same contents as the source
 671          *     self::SKIP_LOCKING      Skip any file locking when doing the store
 672          * @return FileRepoStatus
 673          */
 674         public function storeBatch( array $triplets, $flags = 0 ) {
 675                 $this->assertWritableRepo(); // fail out if read-only
 676
 677                 $status = $this->newGood();
 678                 $backend = $this->backend; // convenience
 679
 680                 $operations = array();
 681                 $sourceFSFilesToDelete = array(); // cleanup for disk source files
 682                 // Validate each triplet and get the store operation...
 683                 foreach ( $triplets as $triplet ) {
 684                         list( $srcPath, $dstZone, $dstRel ) = $triplet;
 685                         wfDebug( __METHOD__
 686                                 . "( \$src='$srcPath', \$dstZone='$dstZone', \$dstRel='$dstRel' )\n"
 687                         );
 688
 689                         // Resolve destination path
 690                         $root = $this->getZonePath( $dstZone );
 691                         if ( !$root ) {
 692                                 throw new MWException( "Invalid zone: $dstZone" );
 693                         }
 694                         if ( !$this->validateFilename( $dstRel ) ) {
 695                                 throw new MWException( 'Validation error in $dstRel' );
 696                         }
 697                         $dstPath = "$root/$dstRel";
 698                         $dstDir  = dirname( $dstPath );
 699                         // Create destination directories for this triplet
 700                         if ( !$backend->prepare( array( 'dir' => $dstDir ) )->isOK() ) {
 701                                 return $this->newFatal( 'directorycreateerror', $dstDir );
 702                         }
 703
 704                         if ( $dstZone == 'deleted' ) {
 705                                 $this->initDeletedDir( $dstDir );
 706                         }
 707
 708                         // Resolve source to a storage path if virtual
 709                         $srcPath = $this->resolveToStoragePath( $srcPath );
 710
 711                         // Get the appropriate file operation
 712                         if ( FileBackend::isStoragePath( $srcPath ) ) {
 713                                 $opName = ( $flags & self::DELETE_SOURCE ) ? 'move' : 'copy';
 714                         } else {
 715                                 $opName = 'store';
 716                                 if ( $flags & self::DELETE_SOURCE ) {
 717                                         $sourceFSFilesToDelete[] = $srcPath;
 718                                 }
 719                         }
 720                         $operations[] = array(
 721                                 'op'            => $opName,
 722                                 'src'           => $srcPath,
 723                                 'dst'           => $dstPath,
 724                                 'overwrite'     => $flags & self::OVERWRITE,
 725                                 'overwriteSame' => $flags & self::OVERWRITE_SAME,
 726                         );
 727                 }
 728
 729                 // Execute the store operation for each triplet
 730                 $opts = array( 'force' => true );
 731                 if ( $flags & self::SKIP_LOCKING ) {
 732                         $opts['nonLocking'] = true;
 733                 }
 734                 $status->merge( $backend->doOperations( $operations, $opts ) );
 735                 // Cleanup for disk source files...
 736                 foreach ( $sourceFSFilesToDelete as $file ) {
 737                         wfSuppressWarnings();
 738                         unlink( $file ); // FS cleanup
 739                         wfRestoreWarnings();
 740                 }
 741
 742                 return $status;
 743         }
 744
 745         /**
 746          * Deletes a batch of files.
 747          * Each file can be a (zone, rel) pair, virtual url, storage path.
 748          * It will try to delete each file, but ignores any errors that may occur.
 749          *
 750          * @param $pairs array List of files to delete
 751          * @param $flags Integer: bitwise combination of the following flags:
 752          *     self::SKIP_LOCKING      Skip any file locking when doing the deletions
 753          * @return FileRepoStatus
 754          */
 755         public function cleanupBatch( array $files, $flags = 0 ) {
 756                 $this->assertWritableRepo(); // fail out if read-only
 757
 758                 $status = $this->newGood();
 759
 760                 $operations = array();
 761                 foreach ( $files as $path ) {
 762                         if ( is_array( $path ) ) {
 763                                 // This is a pair, extract it
 764                                 list( $zone, $rel ) = $path;
 765                                 $path = $this->getZonePath( $zone ) . "/$rel";
 766                         } else {
 767                                 // Resolve source to a storage path if virtual
 768                                 $path = $this->resolveToStoragePath( $path );
 769                         }
 770                         $operations[] = array( 'op' => 'delete', 'src' => $path );
 771                 }
 772                 // Actually delete files from storage...
 773                 $opts = array( 'force' => true );
 774                 if ( $flags & self::SKIP_LOCKING ) {
 775                         $opts['nonLocking'] = true;
 776                 }
 777                 $status->merge( $this->backend->doOperations( $operations, $opts ) );
 778
 779                 return $status;
 780         }
 781
 782         /**
 783          * Import a file from the local file system into the repo.
 784          * This does no locking nor journaling and overrides existing files.
 785          * This function can be used to write to otherwise read-only foreign repos.
 786          * This is intended for copying generated thumbnails into the repo.
 787          *
 788          * @param $src string File system path
 789          * @param $dst string Virtual URL or storage path
 790          * @return FileRepoStatus
 791          */
 792         final public function quickImport( $src, $dst ) {
 793                 return $this->quickImportBatch( array( array( $src, $dst ) ) );
 794         }
 795
 796         /**
 797          * Purge a file from the repo. This does no locking nor journaling.
 798          * This function can be used to write to otherwise read-only foreign repos.
 799          * This is intended for purging thumbnails.
 800          *
 801          * @param $path string Virtual URL or storage path
 802          * @return FileRepoStatus
 803          */
 804         final public function quickPurge( $path ) {
 805                 return $this->quickPurgeBatch( array( $path ) );
 806         }
 807
 808         /**
 809          * Deletes a directory if empty.
 810          * This function can be used to write to otherwise read-only foreign repos.
 811          *
 812          * @param $dir string Virtual URL (or storage path) of directory to clean
 813          * @return Status
 814          */
 815         public function quickCleanDir( $dir ) {
 816                 $status = $this->newGood();
 817                 $status->merge( $this->backend->clean(
 818                         array( 'dir' => $this->resolveToStoragePath( $dir ) ) ) );
 819
 820                 return $status;
 821         }
 822
 823         /**
 824          * Import a batch of files from the local file system into the repo.
 825          * This does no locking nor journaling and overrides existing files.
 826          * This function can be used to write to otherwise read-only foreign repos.
 827          * This is intended for copying generated thumbnails into the repo.
 828          *
 829          * @param $src Array List of tuples (file system path, virtual URL or storage path)
 830          * @return FileRepoStatus
 831          */
 832         public function quickImportBatch( array $pairs ) {
 833                 $status = $this->newGood();
 834                 $operations = array();
 835                 foreach ( $pairs as $pair ) {
 836                         list ( $src, $dst ) = $pair;
 837                         $operations[] = array(
 838                                 'op'        => 'store',
 839                                 'src'       => $src,
 840                                 'dst'       => $this->resolveToStoragePath( $dst ),
 841                                 'overwrite' => true
 842                         );
 843                         $this->backend->prepare( array( 'dir' => dirname( $dst ) ) );
 844                 }
 845                 $status->merge( $this->backend->doOperations( $operations,
 846                         array( 'force' => 1, 'nonLocking' => 1, 'allowStale' => 1, 'nonJournaled' => 1 )
 847                 ) );
 848
 849                 return $status;
 850         }
 851
 852         /**
 853          * Purge a batch of files from the repo.
 854          * This function can be used to write to otherwise read-only foreign repos.
 855          * This does no locking nor journaling and is intended for purging thumbnails.
 856          *
 857          * @param $path Array List of virtual URLs or storage paths
 858          * @return FileRepoStatus
 859          */
 860         public function quickPurgeBatch( array $paths ) {
 861                 $status = $this->newGood();
 862                 $operations = array();
 863                 foreach ( $paths as $path ) {
 864                         $operations[] = array(
 865                                 'op'                  => 'delete',
 866                                 'src'                 => $this->resolveToStoragePath( $path ),
 867                                 'ignoreMissingSource' => true
 868                         );
 869                 }
 870                 $status->merge( $this->backend->doOperations( $operations,
 871                         array( 'force' => 1, 'nonLocking' => 1, 'allowStale' => 1, 'nonJournaled' => 1 )
 872                 ) );
 873
 874                 return $status;
 875         }
 876
 877         /**
 878          * Pick a random name in the temp zone and store a file to it.
 879          * Returns a FileRepoStatus object with the file Virtual URL in the value,
 880          * file can later be disposed using FileRepo::freeTemp().
 881          *
 882          * @param $originalName String: the base name of the file as specified
 883          *     by the user. The file extension will be maintained.
 884          * @param $srcPath String: the current location of the file.
 885          * @return FileRepoStatus object with the URL in the value.
 886          */
 887         public function storeTemp( $originalName, $srcPath ) {
 888                 $this->assertWritableRepo(); // fail out if read-only
 889
 890                 $date      = gmdate( "YmdHis" );
 891                 $hashPath  = $this->getHashPath( $originalName );
 892                 $dstRel    = "{$hashPath}{$date}!{$originalName}";
 893                 $dstUrlRel = $hashPath . $date . '!' . rawurlencode( $originalName );
 894
 895                 $result = $this->store( $srcPath, 'temp', $dstRel, self::SKIP_LOCKING );
 896                 $result->value = $this->getVirtualUrl( 'temp' ) . '/' . $dstUrlRel;
 897
 898                 return $result;
 899         }
 900
 901         /**
 902          * Concatenate a list of files into a target file location.
 903          *
 904          * @param $srcPaths Array Ordered list of source virtual URLs/storage paths
 905          * @param $dstPath String Target file system path
 906          * @param $flags Integer: bitwise combination of the following flags:
 907          *     self::DELETE_SOURCE     Delete the source files
 908          * @return FileRepoStatus
 909          */
 910         public function concatenate( array $srcPaths, $dstPath, $flags = 0 ) {
 911                 $this->assertWritableRepo(); // fail out if read-only
 912
 913                 $status = $this->newGood();
 914
 915                 $sources = array();
 916                 $deleteOperations = array(); // post-concatenate ops
 917                 foreach ( $srcPaths as $srcPath ) {
 918                         // Resolve source to a storage path if virtual
 919                         $source = $this->resolveToStoragePath( $srcPath );
 920                         $sources[] = $source; // chunk to merge
 921                         if ( $flags & self::DELETE_SOURCE ) {
 922                                 $deleteOperations[] = array( 'op' => 'delete', 'src' => $source );
 923                         }
 924                 }
 925
 926                 // Concatenate the chunks into one FS file
 927                 $params = array( 'srcs' => $sources, 'dst' => $dstPath );
 928                 $status->merge( $this->backend->concatenate( $params ) );
 929                 if ( !$status->isOK() ) {
 930                         return $status;
 931                 }
 932
 933                 // Delete the sources if required
 934                 if ( $deleteOperations ) {
 935                         $opts = array( 'force' => true );
 936                         $status->merge( $this->backend->doOperations( $deleteOperations, $opts ) );
 937                 }
 938
 939                 // Make sure status is OK, despite any $deleteOperations fatals
 940                 $status->setResult( true );
 941
 942                 return $status;
 943         }
 944
 945         /**
 946          * Remove a temporary file or mark it for garbage collection
 947          *
 948          * @param $virtualUrl String: the virtual URL returned by FileRepo::storeTemp()
 949          * @return Boolean: true on success, false on failure
 950          */
 951         public function freeTemp( $virtualUrl ) {
 952                 $this->assertWritableRepo(); // fail out if read-only
 953
 954                 $temp = "mwrepo://{$this->name}/temp";
 955                 if ( substr( $virtualUrl, 0, strlen( $temp ) ) != $temp ) {
 956                         wfDebug( __METHOD__.": Invalid temp virtual URL\n" );
 957                         return false;
 958                 }
 959                 $path = $this->resolveVirtualUrl( $virtualUrl );
 960
 961                 return $this->cleanupBatch( array( $path ), self::SKIP_LOCKING )->isOK();
 962         }
 963
 964         /**
 965          * Copy or move a file either from a storage path, virtual URL,
 966          * or FS path, into this repository at the specified destination location.
 967          *
 968          * Returns a FileRepoStatus object. On success, the value contains "new" or
 969          * "archived", to indicate whether the file was new with that name.
 970          *
 971          * @param $srcPath String: the source FS path, storage path, or URL
 972          * @param $dstRel String: the destination relative path
 973          * @param $archiveRel String: the relative path where the existing file is to
 974          *        be archived, if there is one. Relative to the public zone root.
 975          * @param $flags Integer: bitfield, may be FileRepo::DELETE_SOURCE to indicate
 976          *        that the source file should be deleted if possible
 977          * @return FileRepoStatus
 978          */
 979         public function publish( $srcPath, $dstRel, $archiveRel, $flags = 0 ) {
 980                 $this->assertWritableRepo(); // fail out if read-only
 981
 982                 $status = $this->publishBatch( array( array( $srcPath, $dstRel, $archiveRel ) ), $flags );
 983                 if ( $status->successCount == 0 ) {
 984                         $status->ok = false;
 985                 }
 986                 if ( isset( $status->value[0] ) ) {
 987                         $status->value = $status->value[0];
 988                 } else {
 989                         $status->value = false;
 990                 }
 991
 992                 return $status;
 993         }
 994
 995         /**
 996          * Publish a batch of files
 997          *
 998          * @param $triplets Array: (source, dest, archive) triplets as per publish()
 999          * @param $flags Integer: bitfield, may be FileRepo::DELETE_SOURCE to indicate
1000          *        that the source files should be deleted if possible
1001          * @return FileRepoStatus
1002          */
1003         public function publishBatch( array $triplets, $flags = 0 ) {
1004                 $this->assertWritableRepo(); // fail out if read-only
1005
1006                 $backend = $this->backend; // convenience
1007                 // Try creating directories
1008                 $status = $this->initZones( 'public' );
1009                 if ( !$status->isOK() ) {
1010                         return $status;
1011                 }
1012
1013                 $status = $this->newGood( array() );
1014
1015                 $operations = array();
1016                 $sourceFSFilesToDelete = array(); // cleanup for disk source files
1017                 // Validate each triplet and get the store operation...
1018                 foreach ( $triplets as $i => $triplet ) {
1019                         list( $srcPath, $dstRel, $archiveRel ) = $triplet;
1020                         // Resolve source to a storage path if virtual
1021                         $srcPath = $this->resolveToStoragePath( $srcPath );
1022                         if ( !$this->validateFilename( $dstRel ) ) {
1023                                 throw new MWException( 'Validation error in $dstRel' );
1024                         }
1025                         if ( !$this->validateFilename( $archiveRel ) ) {
1026                                 throw new MWException( 'Validation error in $archiveRel' );
1027                         }
1028
1029                         $publicRoot = $this->getZonePath( 'public' );
1030                         $dstPath = "$publicRoot/$dstRel";
1031                         $archivePath = "$publicRoot/$archiveRel";
1032
1033                         $dstDir = dirname( $dstPath );
1034                         $archiveDir = dirname( $archivePath );
1035                         // Abort immediately on directory creation errors since they're likely to be repetitive
1036                         if ( !$backend->prepare( array( 'dir' => $dstDir ) )->isOK() ) {
1037                                 return $this->newFatal( 'directorycreateerror', $dstDir );
1038                         }
1039                         if ( !$backend->prepare( array( 'dir' => $archiveDir ) )->isOK() ) {
1040                                 return $this->newFatal( 'directorycreateerror', $archiveDir );
1041                         }
1042
1043                         // Archive destination file if it exists
1044                         if ( $backend->fileExists( array( 'src' => $dstPath ) ) ) {
1045                                 // Check if the archive file exists
1046                                 // This is a sanity check to avoid data loss. In UNIX, the rename primitive
1047                                 // unlinks the destination file if it exists. DB-based synchronisation in
1048                                 // publishBatch's caller should prevent races. In Windows there's no
1049                                 // problem because the rename primitive fails if the destination exists.
1050                                 if ( $backend->fileExists( array( 'src' => $archivePath ) ) ) {
1051                                         $operations[] = array( 'op' => 'null' );
1052                                         continue;
1053                                 } else {
1054                                         $operations[] = array(
1055                                                 'op'           => 'move',
1056                                                 'src'          => $dstPath,
1057                                                 'dst'          => $archivePath
1058                                         );
1059                                 }
1060                                 $status->value[$i] = 'archived';
1061                         } else {
1062                                 $status->value[$i] = 'new';
1063                         }
1064                         // Copy (or move) the source file to the destination
1065                         if ( FileBackend::isStoragePath( $srcPath ) ) {
1066                                 if ( $flags & self::DELETE_SOURCE ) {
1067                                         $operations[] = array(
1068                                                 'op'           => 'move',
1069                                                 'src'          => $srcPath,
1070                                                 'dst'          => $dstPath
1071                                         );
1072                                 } else {
1073                                         $operations[] = array(
1074                                                 'op'           => 'copy',
1075                                                 'src'          => $srcPath,
1076                                                 'dst'          => $dstPath
1077                                         );
1078                                 }
1079                         } else { // FS source path
1080                                 $operations[] = array(
1081                                         'op'           => 'store',
1082                                         'src'          => $srcPath,
1083                                         'dst'          => $dstPath
1084                                 );
1085                                 if ( $flags & self::DELETE_SOURCE ) {
1086                                         $sourceFSFilesToDelete[] = $srcPath;
1087                                 }
1088                         }
1089                 }
1090
1091                 // Execute the operations for each triplet
1092                 $opts = array( 'force' => true );
1093                 $status->merge( $backend->doOperations( $operations, $opts ) );
1094                 // Cleanup for disk source files...
1095                 foreach ( $sourceFSFilesToDelete as $file ) {
1096                         wfSuppressWarnings();
1097                         unlink( $file ); // FS cleanup
1098                         wfRestoreWarnings();
1099                 }
1100
1101                 return $status;
1102         }
1103
1104         /**
1105          * Deletes a directory if empty.
1106          *
1107          * @param $dir string Virtual URL (or storage path) of directory to clean
1108          * @return Status
1109          */
1110         public function cleanDir( $dir ) {
1111                 $this->assertWritableRepo(); // fail out if read-only
1112
1113                 $status = $this->newGood();
1114                 $status->merge( $this->backend->clean(
1115                         array( 'dir' => $this->resolveToStoragePath( $dir ) ) ) );
1116
1117                 return $status;
1118         }
1119
1120         /**
1121          * Checks existence of a a file
1122          *
1123          * @param $file string Virtual URL (or storage path) of file to check
1124          * @return bool
1125          */
1126         public function fileExists( $file ) {
1127                 $result = $this->fileExistsBatch( array( $file ) );
1128                 return $result[0];
1129         }
1130
1131         /**
1132          * Checks existence of an array of files.
1133          *
1134          * @param $files Array: Virtual URLs (or storage paths) of files to check
1135          * @return array|bool Either array of files and existence flags, or false
1136          */
1137         public function fileExistsBatch( array $files ) {
1138                 $result = array();
1139                 foreach ( $files as $key => $file ) {
1140                         $file = $this->resolveToStoragePath( $file );
1141                         $result[$key] = $this->backend->fileExists( array( 'src' => $file ) );
1142                 }
1143                 return $result;
1144         }
1145
1146         /**
1147          * Move a file to the deletion archive.
1148          * If no valid deletion archive exists, this may either delete the file
1149          * or throw an exception, depending on the preference of the repository
1150          *
1151          * @param $srcRel Mixed: relative path for the file to be deleted
1152          * @param $archiveRel Mixed: relative path for the archive location.
1153          *        Relative to a private archive directory.
1154          * @return FileRepoStatus object
1155          */
1156         public function delete( $srcRel, $archiveRel ) {
1157                 $this->assertWritableRepo(); // fail out if read-only
1158
1159                 return $this->deleteBatch( array( array( $srcRel, $archiveRel ) ) );
1160         }
1161
1162         /**
1163          * Move a group of files to the deletion archive.
1164          *
1165          * If no valid deletion archive is configured, this may either delete the
1166          * file or throw an exception, depending on the preference of the repository.
1167          *
1168          * The overwrite policy is determined by the repository -- currently LocalRepo
1169          * assumes a naming scheme in the deleted zone based on content hash, as
1170          * opposed to the public zone which is assumed to be unique.
1171          *
1172          * @param $sourceDestPairs Array of source/destination pairs. Each element
1173          *        is a two-element array containing the source file path relative to the
1174          *        public root in the first element, and the archive file path relative
1175          *        to the deleted zone root in the second element.
1176          * @return FileRepoStatus
1177          */
1178         public function deleteBatch( array $sourceDestPairs ) {
1179                 $this->assertWritableRepo(); // fail out if read-only
1180
1181                 // Try creating directories
1182                 $status = $this->initZones( array( 'public', 'deleted' ) );
1183                 if ( !$status->isOK() ) {
1184                         return $status;
1185                 }
1186
1187                 $status = $this->newGood();
1188
1189                 $backend = $this->backend; // convenience
1190                 $operations = array();
1191                 // Validate filenames and create archive directories
1192                 foreach ( $sourceDestPairs as $pair ) {
1193                         list( $srcRel, $archiveRel ) = $pair;
1194                         if ( !$this->validateFilename( $srcRel ) ) {
1195                                 throw new MWException( __METHOD__.':Validation error in $srcRel' );
1196                         } elseif ( !$this->validateFilename( $archiveRel ) ) {
1197                                 throw new MWException( __METHOD__.':Validation error in $archiveRel' );
1198                         }
1199
1200                         $publicRoot = $this->getZonePath( 'public' );
1201                         $srcPath = "{$publicRoot}/$srcRel";
1202
1203                         $deletedRoot = $this->getZonePath( 'deleted' );
1204                         $archivePath = "{$deletedRoot}/{$archiveRel}";
1205                         $archiveDir = dirname( $archivePath ); // does not touch FS
1206
1207                         // Create destination directories
1208                         if ( !$backend->prepare( array( 'dir' => $archiveDir ) )->isOK() ) {
1209                                 return $this->newFatal( 'directorycreateerror', $archiveDir );
1210                         }
1211                         $this->initDeletedDir( $archiveDir );
1212
1213                         $operations[] = array(
1214                                 'op'            => 'move',
1215                                 'src'           => $srcPath,
1216                                 'dst'           => $archivePath,
1217                                 // We may have 2+ identical files being deleted,
1218                                 // all of which will map to the same destination file
1219                                 'overwriteSame' => true // also see bug 31792
1220                         );
1221                 }
1222
1223                 // Move the files by execute the operations for each pair.
1224                 // We're now committed to returning an OK result, which will
1225                 // lead to the files being moved in the DB also.
1226                 $opts = array( 'force' => true );
1227                 $status->merge( $backend->doOperations( $operations, $opts ) );
1228
1229                 return $status;
1230         }
1231
1232         /**
1233          * Delete files in the deleted directory if they are not referenced in the filearchive table
1234          *
1235          * STUB
1236          */
1237         public function cleanupDeletedBatch( array $storageKeys ) {
1238                 $this->assertWritableRepo();
1239         }
1240
1241         /**
1242          * Get a relative path for a deletion archive key,
1243          * e.g. s/z/a/ for sza251lrxrc1jad41h5mgilp8nysje52.jpg
1244          *
1245          * @return string
1246          */
1247         public function getDeletedHashPath( $key ) {
1248                 $path = '';
1249                 for ( $i = 0; $i < $this->deletedHashLevels; $i++ ) {
1250                         $path .= $key[$i] . '/';
1251                 }
1252                 return $path;
1253         }
1254
1255         /**
1256          * If a path is a virtual URL, resolve it to a storage path.
1257          * Otherwise, just return the path as it is.
1258          *
1259          * @param $path string
1260          * @return string
1261          * @throws MWException
1262          */
1263         protected function resolveToStoragePath( $path ) {
1264                 if ( $this->isVirtualUrl( $path ) ) {
1265                         return $this->resolveVirtualUrl( $path );
1266                 }
1267                 return $path;
1268         }
1269
1270         /**
1271          * Get a local FS copy of a file with a given virtual URL/storage path.
1272          * Temporary files may be purged when the file object falls out of scope.
1273          *
1274          * @param $virtualUrl string
1275          * @return TempFSFile|null Returns null on failure
1276          */
1277         public function getLocalCopy( $virtualUrl ) {
1278                 $path = $this->resolveToStoragePath( $virtualUrl );
1279                 return $this->backend->getLocalCopy( array( 'src' => $path ) );
1280         }
1281
1282         /**
1283          * Get a local FS file with a given virtual URL/storage path.
1284          * The file is either an original or a copy. It should not be changed.
1285          * Temporary files may be purged when the file object falls out of scope.
1286          *
1287          * @param $virtualUrl string
1288          * @return FSFile|null Returns null on failure.
1289          */
1290         public function getLocalReference( $virtualUrl ) {
1291                 $path = $this->resolveToStoragePath( $virtualUrl );
1292                 return $this->backend->getLocalReference( array( 'src' => $path ) );
1293         }
1294
1295         /**
1296          * Get properties of a file with a given virtual URL/storage path.
1297          * Properties should ultimately be obtained via FSFile::getProps().
1298          *
1299          * @param $virtualUrl string
1300          * @return Array
1301          */
1302         public function getFileProps( $virtualUrl ) {
1303                 $path = $this->resolveToStoragePath( $virtualUrl );
1304                 return $this->backend->getFileProps( array( 'src' => $path ) );
1305         }
1306
1307         /**
1308          * Get the timestamp of a file with a given virtual URL/storage path
1309          *
1310          * @param $virtualUrl string
1311          * @return string|bool False on failure
1312          */
1313         public function getFileTimestamp( $virtualUrl ) {
1314                 $path = $this->resolveToStoragePath( $virtualUrl );
1315                 return $this->backend->getFileTimestamp( array( 'src' => $path ) );
1316         }
1317
1318         /**
1319          * Get the sha1 of a file with a given virtual URL/storage path
1320          *
1321          * @param $virtualUrl string
1322          * @return string|bool
1323          */
1324         public function getFileSha1( $virtualUrl ) {
1325                 $path = $this->resolveToStoragePath( $virtualUrl );
1326                 $tmpFile = $this->backend->getLocalReference( array( 'src' => $path ) );
1327                 if ( !$tmpFile ) {
1328                         return false;
1329                 }
1330                 return $tmpFile->getSha1Base36();
1331         }
1332
1333         /**
1334          * Attempt to stream a file with the given virtual URL/storage path
1335          *
1336          * @param $virtualUrl string
1337          * @param $headers Array Additional HTTP headers to send on success
1338          * @return bool Success
1339          */
1340         public function streamFile( $virtualUrl, $headers = array() ) {
1341                 $path = $this->resolveToStoragePath( $virtualUrl );
1342                 $params = array( 'src' => $path, 'headers' => $headers );
1343                 return $this->backend->streamFile( $params )->isOK();
1344         }
1345
1346         /**
1347          * Call a callback function for every public regular file in the repository.
1348          * This only acts on the current version of files, not any old versions.
1349          * May use either the database or the filesystem.
1350          *
1351          * @param $callback Array|string
1352          * @return void
1353          */
1354         public function enumFiles( $callback ) {
1355                 $this->enumFilesInStorage( $callback );
1356         }
1357
1358         /**
1359          * Call a callback function for every public file in the repository.
1360          * May use either the database or the filesystem.
1361          *
1362          * @param $callback Array|string
1363          * @return void
1364          */
1365         protected function enumFilesInStorage( $callback ) {
1366                 $publicRoot = $this->getZonePath( 'public' );
1367                 $numDirs = 1 << ( $this->hashLevels * 4 );
1368                 // Use a priori assumptions about directory structure
1369                 // to reduce the tree height of the scanning process.
1370                 for ( $flatIndex = 0; $flatIndex < $numDirs; $flatIndex++ ) {
1371                         $hexString = sprintf( "%0{$this->hashLevels}x", $flatIndex );
1372                         $path = $publicRoot;
1373                         for ( $hexPos = 0; $hexPos < $this->hashLevels; $hexPos++ ) {
1374                                 $path .= '/' . substr( $hexString, 0, $hexPos + 1 );
1375                         }
1376                         $iterator = $this->backend->getFileList( array( 'dir' => $path ) );
1377                         foreach ( $iterator as $name ) {
1378                                 // Each item returned is a public file
1379                                 call_user_func( $callback, "{$path}/{$name}" );
1380                         }
1381                 }
1382         }
1383
1384         /**
1385          * Determine if a relative path is valid, i.e. not blank or involving directory traveral
1386          *
1387          * @param $filename string
1388          * @return bool
1389          */
1390         public function validateFilename( $filename ) {
1391                 if ( strval( $filename ) == '' ) {
1392                         return false;
1393                 }
1394                 return FileBackend::isPathTraversalFree( $filename );
1395         }
1396
1397         /**
1398          * Get a callback function to use for cleaning error message parameters
1399          *
1400          * @return Array
1401          */
1402         function getErrorCleanupFunction() {
1403                 switch ( $this->pathDisclosureProtection ) {
1404                         case 'none':
1405                         case 'simple': // b/c
1406                                 $callback = array( $this, 'passThrough' );
1407                                 break;
1408                         default: // 'paranoid'
1409                                 $callback = array( $this, 'paranoidClean' );
1410                 }
1411                 return $callback;
1412         }
1413
1414         /**
1415          * Path disclosure protection function
1416          *
1417          * @param $param string
1418          * @return string
1419          */
1420         function paranoidClean( $param ) {
1421                 return '[hidden]';
1422         }
1423
1424         /**
1425          * Path disclosure protection function
1426          *
1427          * @param $param string
1428          * @return string
1429          */
1430         function passThrough( $param ) {
1431                 return $param;
1432         }
1433
1434         /**
1435          * Create a new fatal error
1436          *
1437          * @return FileRepoStatus
1438          */
1439         public function newFatal( $message /*, parameters...*/ ) {
1440                 $params = func_get_args();
1441                 array_unshift( $params, $this );
1442                 return MWInit::callStaticMethod( 'FileRepoStatus', 'newFatal', $params );
1443         }
1444
1445         /**
1446          * Create a new good result
1447          *
1448          * @return FileRepoStatus
1449          */
1450         public function newGood( $value = null ) {
1451                 return FileRepoStatus::newGood( $this, $value );
1452         }
1453
1454         /**
1455          * Checks if there is a redirect named as $title. If there is, return the
1456          * title object. If not, return false.
1457          * STUB
1458          *
1459          * @param $title Title of image
1460          * @return Bool
1461          */
1462         public function checkRedirect( Title $title ) {
1463                 return false;
1464         }
1465
1466         /**
1467          * Invalidates image redirect cache related to that image
1468          * Doesn't do anything for repositories that don't support image redirects.
1469          *
1470          * STUB
1471          * @param $title Title of image
1472          */
1473         public function invalidateImageRedirect( Title $title ) {}
1474
1475         /**
1476          * Get the human-readable name of the repo
1477          *
1478          * @return string
1479          */
1480         public function getDisplayName() {
1481                 // We don't name our own repo, return nothing
1482                 if ( $this->isLocal() ) {
1483                         return null;
1484                 }
1485                 // 'shared-repo-name-wikimediacommons' is used when $wgUseInstantCommons = true
1486                 return wfMessageFallback( 'shared-repo-name-' . $this->name, 'shared-repo' )->text();
1487         }
1488
1489         /**
1490          * Returns true if this the local file repository.
1491          *
1492          * @return bool
1493          */
1494         public function isLocal() {
1495                 return $this->getName() == 'local';
1496         }
1497
1498         /**
1499          * Get a key on the primary cache for this repository.
1500          * Returns false if the repository's cache is not accessible at this site.
1501          * The parameters are the parts of the key, as for wfMemcKey().
1502          *
1503          * STUB
1504          * @return bool
1505          */
1506         public function getSharedCacheKey( /*...*/ ) {
1507                 return false;
1508         }
1509
1510         /**
1511          * Get a key for this repo in the local cache domain. These cache keys are
1512          * not shared with remote instances of the repo.
1513          * The parameters are the parts of the key, as for wfMemcKey().
1514          *
1515          * @return string
1516          */
1517         public function getLocalCacheKey( /*...*/ ) {
1518                 $args = func_get_args();
1519                 array_unshift( $args, 'filerepo', $this->getName() );
1520                 return call_user_func_array( 'wfMemcKey', $args );
1521         }
1522
1523         /**
1524          * Get an temporary FileRepo associated with this repo.
1525          * Files will be created in the temp zone of this repo and
1526          * thumbnails in a /temp subdirectory in thumb zone of this repo.
1527          * It will have the same backend as this repo.
1528          *
1529          * @return TempFileRepo
1530          */
1531         public function getTempRepo() {
1532                 return new TempFileRepo( array(
1533                         'name'      => "{$this->name}-temp",
1534                         'backend'   => $this->backend,
1535                         'zones'     => array(
1536                                 'public' => array(
1537                                         'container' => $this->zones['temp']['container'],
1538                                         'directory' => $this->zones['temp']['directory']
1539                                 ),
1540                                 'thumb'  => array(
1541                                         'container' => $this->zones['thumb']['container'],
1542                                         'directory' => ( $this->zones['thumb']['directory'] == '' )
1543                                                 ? 'temp'
1544                                                 : $this->zones['thumb']['directory'] . '/temp'
1545                                 )
1546                         ),
1547                         'url'        => $this->getZoneUrl( 'temp' ),
1548                         'thumbUrl'   => $this->getZoneUrl( 'thumb' ) . '/temp',
1549                         'hashLevels' => $this->hashLevels // performance
1550                 ) );
1551         }
1552
1553         /**
1554          * Get an UploadStash associated with this repo.
1555          *
1556          * @return UploadStash
1557          */
1558         public function getUploadStash() {
1559                 return new UploadStash( $this );
1560         }
1561
1562         /**
1563          * Throw an exception if this repo is read-only by design.
1564          * This does not and should not check getReadOnlyReason().
1565          *
1566          * @return void
1567          * @throws MWException
1568          */
1569         protected function assertWritableRepo() {}
1570 }
1571
1572 /**
1573  * FileRepo for temporary files created via FileRepo::getTempRepo()
1574  */
1575 class TempFileRepo extends FileRepo {
1576         public function getTempRepo() {
1577                 throw new MWException( "Cannot get a temp repo from a temp repo." );
1578         }
1579 }