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
  55         /**
  56          * Factory functions for creating new files
  57          * Override these in the base class
  58          */
  59         var $fileFactory = array( 'UnregisteredLocalFile', 'newFromTitle' );
  60         var $oldFileFactory = false;
  61         var $fileFactoryKey = false, $oldFileFactoryKey = false;
  62
  63         function __construct( array $info = null ) {
  64                 // Verify required settings presence
  65                 if(
  66                         $info === null
  67                         || !array_key_exists( 'name', $info )
  68                         || !array_key_exists( 'backend', $info )
  69                 ) {
  70                         throw new MWException( __CLASS__ . " requires an array of options having both 'name' and 'backend' keys.\n" );
  71                 }
  72
  73                 // Required settings
  74                 $this->name = $info['name'];
  75                 if ( $info['backend'] instanceof FileBackend ) {
  76                         $this->backend = $info['backend']; // useful for testing
  77                 } else {
  78                         $this->backend = FileBackendGroup::singleton()->get( $info['backend'] );
  79                 }
  80
  81                 // Optional settings that can have no value
  82                 $optionalSettings = array(
  83                         'descBaseUrl', 'scriptDirUrl', 'articleUrl', 'fetchDescription',
  84                         'thumbScriptUrl', 'pathDisclosureProtection', 'descriptionCacheExpiry',
  85                         'scriptExtension'
  86                 );
  87                 foreach ( $optionalSettings as $var ) {
  88                         if ( isset( $info[$var] ) ) {
  89                                 $this->$var = $info[$var];
  90                         }
  91                 }
  92
  93                 // Optional settings that have a default
  94                 $this->initialCapital = isset( $info['initialCapital'] )
  95                         ? $info['initialCapital']
  96                         : MWNamespace::isCapitalized( NS_FILE );
  97                 $this->url = isset( $info['url'] )
  98                         ? $info['url']
  99                         : false; // a subclass may set the URL (e.g. ForeignAPIRepo)
 100                 if ( isset( $info['thumbUrl'] ) ) {
 101                         $this->thumbUrl = $info['thumbUrl'];
 102                 } else {
 103                         $this->thumbUrl = $this->url ? "{$this->url}/thumb" : false;
 104                 }
 105                 $this->hashLevels = isset( $info['hashLevels'] )
 106                         ? $info['hashLevels']
 107                         : 2;
 108                 $this->deletedHashLevels = isset( $info['deletedHashLevels'] )
 109                         ? $info['deletedHashLevels']
 110                         : $this->hashLevels;
 111                 $this->transformVia404 = !empty( $info['transformVia404'] );
 112                 $this->zones = isset( $info['zones'] )
 113                         ? $info['zones']
 114                         : array();
 115                 // Give defaults for the basic zones...
 116                 foreach ( array( 'public', 'thumb', 'temp', 'deleted' ) as $zone ) {
 117                         if ( !isset( $this->zones[$zone] ) ) {
 118                                 $this->zones[$zone] = array(
 119                                         'container' => "{$this->name}-{$zone}",
 120                                         'directory' => '' // container root
 121                                 );
 122                         }
 123                 }
 124         }
 125
 126         /**
 127          * Get the file backend instance. Use this function wisely.
 128          *
 129          * @return FileBackend
 130          */
 131         public function getBackend() {
 132                 return $this->backend;
 133         }
 134
 135         /**
 136          * Get an explanatory message if this repo is read-only.
 137          * This checks if an administrator disabled writes to the backend.
 138          *
 139          * @return string|bool Returns false if the repo is not read-only
 140          */
 141         public function getReadOnlyReason() {
 142                 return $this->backend->getReadOnlyReason();
 143         }
 144
 145         /**
 146          * Check if a single zone or list of zones is defined for usage
 147          *
 148          * @param $doZones Array Only do a particular zones
 149          * @return Status
 150          */
 151         protected function initZones( $doZones = array() ) {
 152                 $status = $this->newGood();
 153                 foreach ( (array)$doZones as $zone ) {
 154                         $root = $this->getZonePath( $zone );
 155                         if ( $root === null ) {
 156                                 throw new MWException( "No '$zone' zone defined in the {$this->name} repo." );
 157                         }
 158                 }
 159                 return $status;
 160         }
 161
 162         /**
 163          * Take all available measures to prevent web accessibility of new deleted
 164          * directories, in case the user has not configured offline storage
 165          *
 166          * @param $dir string
 167          * @return void
 168          */
 169         protected function initDeletedDir( $dir ) {
 170                 $this->backend->secure( // prevent web access & dir listings
 171                         array( 'dir' => $dir, 'noAccess' => true, 'noListing' => true ) );
 172         }
 173
 174         /**
 175          * Determine if a string is an mwrepo:// URL
 176          *
 177          * @param $url string
 178          * @return bool
 179          */
 180         public static function isVirtualUrl( $url ) {
 181                 return substr( $url, 0, 9 ) == 'mwrepo://';
 182         }
 183
 184         /**
 185          * Get a URL referring to this repository, with the private mwrepo protocol.
 186          * The suffix, if supplied, is considered to be unencoded, and will be
 187          * URL-encoded before being returned.
 188          *
 189          * @param $suffix string
 190          * @return string
 191          */
 192         public function getVirtualUrl( $suffix = false ) {
 193                 $path = 'mwrepo://' . $this->name;
 194                 if ( $suffix !== false ) {
 195                         $path .= '/' . rawurlencode( $suffix );
 196                 }
 197                 return $path;
 198         }
 199
 200         /**
 201          * Get the URL corresponding to one of the four basic zones
 202          *
 203          * @param $zone String: one of: public, deleted, temp, thumb
 204          * @return String or false
 205          */
 206         public function getZoneUrl( $zone ) {
 207                 switch ( $zone ) {
 208                         case 'public':
 209                                 return $this->url;
 210                         case 'temp':
 211                                 return "{$this->url}/temp";
 212                         case 'deleted':
 213                                 return false; // no public URL
 214                         case 'thumb':
 215                                 return $this->thumbUrl;
 216                         default:
 217                                 return false;
 218                 }
 219         }
 220
 221         /**
 222          * Get the backend storage path corresponding to a virtual URL.
 223          * Use this function wisely.
 224          *
 225          * @param $url string
 226          * @return string
 227          */
 228         public function resolveVirtualUrl( $url ) {
 229                 if ( substr( $url, 0, 9 ) != 'mwrepo://' ) {
 230                         throw new MWException( __METHOD__.': unknown protocol' );
 231                 }
 232                 $bits = explode( '/', substr( $url, 9 ), 3 );
 233                 if ( count( $bits ) != 3 ) {
 234                         throw new MWException( __METHOD__.": invalid mwrepo URL: $url" );
 235                 }
 236                 list( $repo, $zone, $rel ) = $bits;
 237                 if ( $repo !== $this->name ) {
 238                         throw new MWException( __METHOD__.": fetching from a foreign repo is not supported" );
 239                 }
 240                 $base = $this->getZonePath( $zone );
 241                 if ( !$base ) {
 242                         throw new MWException( __METHOD__.": invalid zone: $zone" );
 243                 }
 244                 return $base . '/' . rawurldecode( $rel );
 245         }
 246
 247         /**
 248          * The the storage container and base path of a zone
 249          *
 250          * @param $zone string
 251          * @return Array (container, base path) or (null, null)
 252          */
 253         protected function getZoneLocation( $zone ) {
 254                 if ( !isset( $this->zones[$zone] ) ) {
 255                         return array( null, null ); // bogus
 256                 }
 257                 return array( $this->zones[$zone]['container'], $this->zones[$zone]['directory'] );
 258         }
 259
 260         /**
 261          * Get the storage path corresponding to one of the zones
 262          *
 263          * @param $zone string
 264          * @return string|null Returns null if the zone is not defined
 265          */
 266         public function getZonePath( $zone ) {
 267                 list( $container, $base ) = $this->getZoneLocation( $zone );
 268                 if ( $container === null || $base === null ) {
 269                         return null;
 270                 }
 271                 $backendName = $this->backend->getName();
 272                 if ( $base != '' ) { // may not be set
 273                         $base = "/{$base}";
 274                 }
 275                 return "mwstore://$backendName/{$container}{$base}";
 276         }
 277
 278         /**
 279          * Create a new File object from the local repository
 280          *
 281          * @param $title Mixed: Title object or string
 282          * @param $time Mixed: Time at which the image was uploaded.
 283          *              If this is specified, the returned object will be an
 284          *              instance of the repository's old file class instead of a
 285          *              current file. Repositories not supporting version control
 286          *              should return false if this parameter is set.
 287          * @return File|null A File, or null if passed an invalid Title
 288          */
 289         public function newFile( $title, $time = false ) {
 290                 $title = File::normalizeTitle( $title );
 291                 if ( !$title ) {
 292                         return null;
 293                 }
 294                 if ( $time ) {
 295                         if ( $this->oldFileFactory ) {
 296                                 return call_user_func( $this->oldFileFactory, $title, $this, $time );
 297                         } else {
 298                                 return false;
 299                         }
 300                 } else {
 301                         return call_user_func( $this->fileFactory, $title, $this );
 302                 }
 303         }
 304
 305         /**
 306          * Find an instance of the named file created at the specified time
 307          * Returns false if the file does not exist. Repositories not supporting
 308          * version control should return false if the time is specified.
 309          *
 310          * @param $title Mixed: Title object or string
 311          * @param $options array Associative array of options:
 312          *     time:           requested time for a specific file version, or false for the
 313          *                     current version. An image object will be returned which was
 314          *                     created at the specified time (which may be archived or current).
 315          *
 316          *     ignoreRedirect: If true, do not follow file redirects
 317          *
 318          *     private:        If true, return restricted (deleted) files if the current
 319          *                     user is allowed to view them. Otherwise, such files will not
 320          *                     be found.
 321          * @return File|bool False on failure
 322          */
 323         public function findFile( $title, $options = array() ) {
 324                 $title = File::normalizeTitle( $title );
 325                 if ( !$title ) {
 326                         return false;
 327                 }
 328                 $time = isset( $options['time'] ) ? $options['time'] : false;
 329                 # First try the current version of the file to see if it precedes the timestamp
 330                 $img = $this->newFile( $title );
 331                 if ( !$img ) {
 332                         return false;
 333                 }
 334                 if ( $img->exists() && ( !$time || $img->getTimestamp() == $time ) ) {
 335                         return $img;
 336                 }
 337                 # Now try an old version of the file
 338                 if ( $time !== false ) {
 339                         $img = $this->newFile( $title, $time );
 340                         if ( $img && $img->exists() ) {
 341                                 if ( !$img->isDeleted( File::DELETED_FILE ) ) {
 342                                         return $img; // always OK
 343                                 } elseif ( !empty( $options['private'] ) && $img->userCan( File::DELETED_FILE ) ) {
 344                                         return $img;
 345                                 }
 346                         }
 347                 }
 348
 349                 # Now try redirects
 350                 if ( !empty( $options['ignoreRedirect'] ) ) {
 351                         return false;
 352                 }
 353                 $redir = $this->checkRedirect( $title );
 354                 if ( $redir && $title->getNamespace() == NS_FILE) {
 355                         $img = $this->newFile( $redir );
 356                         if ( !$img ) {
 357                                 return false;
 358                         }
 359                         if ( $img->exists() ) {
 360                                 $img->redirectedFrom( $title->getDBkey() );
 361                                 return $img;
 362                         }
 363                 }
 364                 return false;
 365         }
 366
 367         /**
 368          * Find many files at once.
 369          *
 370          * @param $items array An array of titles, or an array of findFile() options with
 371          *    the "title" option giving the title. Example:
 372          *
 373          *     $findItem = array( 'title' => $title, 'private' => true );
 374          *     $findBatch = array( $findItem );
 375          *     $repo->findFiles( $findBatch );
 376          * @return array
 377          */
 378         public function findFiles( array $items ) {
 379                 $result = array();
 380                 foreach ( $items as $item ) {
 381                         if ( is_array( $item ) ) {
 382                                 $title = $item['title'];
 383                                 $options = $item;
 384                                 unset( $options['title'] );
 385                         } else {
 386                                 $title = $item;
 387                                 $options = array();
 388                         }
 389                         $file = $this->findFile( $title, $options );
 390                         if ( $file ) {
 391                                 $result[$file->getTitle()->getDBkey()] = $file;
 392                         }
 393                 }
 394                 return $result;
 395         }
 396
 397         /**
 398          * Find an instance of the file with this key, created at the specified time
 399          * Returns false if the file does not exist. Repositories not supporting
 400          * version control should return false if the time is specified.
 401          *
 402          * @param $sha1 String base 36 SHA-1 hash
 403          * @param $options array Option array, same as findFile().
 404          * @return File|bool False on failure
 405          */
 406         public function findFileFromKey( $sha1, $options = array() ) {
 407                 $time = isset( $options['time'] ) ? $options['time'] : false;
 408                 # First try to find a matching current version of a file...
 409                 if ( $this->fileFactoryKey ) {
 410                         $img = call_user_func( $this->fileFactoryKey, $sha1, $this, $time );
 411                 } else {
 412                         return false; // find-by-sha1 not supported
 413                 }
 414                 if ( $img && $img->exists() ) {
 415                         return $img;
 416                 }
 417                 # Now try to find a matching old version of a file...
 418                 if ( $time !== false && $this->oldFileFactoryKey ) { // find-by-sha1 supported?
 419                         $img = call_user_func( $this->oldFileFactoryKey, $sha1, $this, $time );
 420                         if ( $img && $img->exists() ) {
 421                                 if ( !$img->isDeleted( File::DELETED_FILE ) ) {
 422                                         return $img; // always OK
 423                                 } elseif ( !empty( $options['private'] ) && $img->userCan( File::DELETED_FILE ) ) {
 424                                         return $img;
 425                                 }
 426                         }
 427                 }
 428                 return false;
 429         }
 430
 431         /**
 432          * Get an array or iterator of file objects for files that have a given
 433          * SHA-1 content hash.
 434          *
 435          * STUB
 436          * @return array
 437          */
 438         public function findBySha1( $hash ) {
 439                 return array();
 440         }
 441
 442         /**
 443          * Get the public root URL of the repository
 444          *
 445          * @return string
 446          */
 447         public function getRootUrl() {
 448                 return $this->url;
 449         }
 450
 451         /**
 452          * Get the URL of thumb.php
 453          *
 454          * @return string
 455          */
 456         public function getThumbScriptUrl() {
 457                 return $this->thumbScriptUrl;
 458         }
 459
 460         /**
 461          * Returns true if the repository can transform files via a 404 handler
 462          *
 463          * @return bool
 464          */
 465         public function canTransformVia404() {
 466                 return $this->transformVia404;
 467         }
 468
 469         /**
 470          * Get the name of an image from its title object
 471          *
 472          * @param $title Title
 473          * @return String
 474          */
 475         public function getNameFromTitle( Title $title ) {
 476                 global $wgContLang;
 477                 if ( $this->initialCapital != MWNamespace::isCapitalized( NS_FILE ) ) {
 478                         $name = $title->getUserCaseDBKey();
 479                         if ( $this->initialCapital ) {
 480                                 $name = $wgContLang->ucfirst( $name );
 481                         }
 482                 } else {
 483                         $name = $title->getDBkey();
 484                 }
 485                 return $name;
 486         }
 487
 488         /**
 489          * Get the public zone root storage directory of the repository
 490          *
 491          * @return string
 492          */
 493         public function getRootDirectory() {
 494                 return $this->getZonePath( 'public' );
 495         }
 496
 497         /**
 498          * Get a relative path including trailing slash, e.g. f/fa/
 499          * If the repo is not hashed, returns an empty string
 500          *
 501          * @param $name string Name of file
 502          * @return string
 503          */
 504         public function getHashPath( $name ) {
 505                 return self::getHashPathForLevel( $name, $this->hashLevels );
 506         }
 507
 508         /**
 509          * Get a relative path including trailing slash, e.g. f/fa/
 510          * If the repo is not hashed, returns an empty string
 511          *
 512          * @param $suffix string Basename of file from FileRepo::storeTemp()
 513          * @return string
 514          */
 515         public function getTempHashPath( $suffix ) {
 516                 $parts = explode( '!', $suffix, 2 ); // format is <timestamp>!<name> or just <name>
 517                 $name = isset( $parts[1] ) ? $parts[1] : $suffix; // hash path is not based on timestamp
 518                 return self::getHashPathForLevel( $name, $this->hashLevels );
 519         }
 520
 521         /**
 522          * @param $name
 523          * @param $levels
 524          * @return string
 525          */
 526         protected static function getHashPathForLevel( $name, $levels ) {
 527                 if ( $levels == 0 ) {
 528                         return '';
 529                 } else {
 530                         $hash = md5( $name );
 531                         $path = '';
 532                         for ( $i = 1; $i <= $levels; $i++ ) {
 533                                 $path .= substr( $hash, 0, $i ) . '/';
 534                         }
 535                         return $path;
 536                 }
 537         }
 538
 539         /**
 540          * Get the number of hash directory levels
 541          *
 542          * @return integer
 543          */
 544         public function getHashLevels() {
 545                 return $this->hashLevels;
 546         }
 547
 548         /**
 549          * Get the name of this repository, as specified by $info['name]' to the constructor
 550          *
 551          * @return string
 552          */
 553         public function getName() {
 554                 return $this->name;
 555         }
 556
 557         /**
 558          * Make an url to this repo
 559          *
 560          * @param $query mixed Query string to append
 561          * @param $entry string Entry point; defaults to index
 562          * @return string|bool False on failure
 563          */
 564         public function makeUrl( $query = '', $entry = 'index' ) {
 565                 if ( isset( $this->scriptDirUrl ) ) {
 566                         $ext = isset( $this->scriptExtension ) ? $this->scriptExtension : '.php';
 567                         return wfAppendQuery( "{$this->scriptDirUrl}/{$entry}{$ext}", $query );
 568                 }
 569                 return false;
 570         }
 571
 572         /**
 573          * Get the URL of an image description page. May return false if it is
 574          * unknown or not applicable. In general this should only be called by the
 575          * File class, since it may return invalid results for certain kinds of
 576          * repositories. Use File::getDescriptionUrl() in user code.
 577          *
 578          * In particular, it uses the article paths as specified to the repository
 579          * constructor, whereas local repositories use the local Title functions.
 580          *
 581          * @param $name string
 582          * @return string
 583          */
 584         public function getDescriptionUrl( $name ) {
 585                 $encName = wfUrlencode( $name );
 586                 if ( !is_null( $this->descBaseUrl ) ) {
 587                         # "http://example.com/wiki/Image:"
 588                         return $this->descBaseUrl . $encName;
 589                 }
 590                 if ( !is_null( $this->articleUrl ) ) {
 591                         # "http://example.com/wiki/$1"
 592                         #
 593                         # We use "Image:" as the canonical namespace for
 594                         # compatibility across all MediaWiki versions.
 595                         return str_replace( '$1',
 596                                 "Image:$encName", $this->articleUrl );
 597                 }
 598                 if ( !is_null( $this->scriptDirUrl ) ) {
 599                         # "http://example.com/w"
 600                         #
 601                         # We use "Image:" as the canonical namespace for
 602                         # compatibility across all MediaWiki versions,
 603                         # and just sort of hope index.php is right. ;)
 604                         return $this->makeUrl( "title=Image:$encName" );
 605                 }
 606                 return false;
 607         }
 608
 609         /**
 610          * Get the URL of the content-only fragment of the description page. For
 611          * MediaWiki this means action=render. This should only be called by the
 612          * repository's file class, since it may return invalid results. User code
 613          * should use File::getDescriptionText().
 614          *
 615          * @param $name String: name of image to fetch
 616          * @param $lang String: language to fetch it in, if any.
 617          * @return string
 618          */
 619         public function getDescriptionRenderUrl( $name, $lang = null ) {
 620                 $query = 'action=render';
 621                 if ( !is_null( $lang ) ) {
 622                         $query .= '&uselang=' . $lang;
 623                 }
 624                 if ( isset( $this->scriptDirUrl ) ) {
 625                         return $this->makeUrl(
 626                                 'title=' .
 627                                 wfUrlencode( 'Image:' . $name ) .
 628                                 "&$query" );
 629                 } else {
 630                         $descUrl = $this->getDescriptionUrl( $name );
 631                         if ( $descUrl ) {
 632                                 return wfAppendQuery( $descUrl, $query );
 633                         } else {
 634                                 return false;
 635                         }
 636                 }
 637         }
 638
 639         /**
 640          * Get the URL of the stylesheet to apply to description pages
 641          *
 642          * @return string|bool False on failure
 643          */
 644         public function getDescriptionStylesheetUrl() {
 645                 if ( isset( $this->scriptDirUrl ) ) {
 646                         return $this->makeUrl( 'title=MediaWiki:Filepage.css&' .
 647                                 wfArrayToCGI( Skin::getDynamicStylesheetQuery() ) );
 648                 }
 649                 return false;
 650         }
 651
 652         /**
 653          * Store a file to a given destination.
 654          *
 655          * @param $srcPath String: source FS path, storage path, or virtual URL
 656          * @param $dstZone String: destination zone
 657          * @param $dstRel String: destination relative path
 658          * @param $flags Integer: bitwise combination of the following flags:
 659          *     self::DELETE_SOURCE     Delete the source file after upload
 660          *     self::OVERWRITE         Overwrite an existing destination file instead of failing
 661          *     self::OVERWRITE_SAME    Overwrite the file if the destination exists and has the
 662          *                             same contents as the source
 663          *     self::SKIP_LOCKING      Skip any file locking when doing the store
 664          * @return FileRepoStatus
 665          */
 666         public function store( $srcPath, $dstZone, $dstRel, $flags = 0 ) {
 667                 $this->assertWritableRepo(); // fail out if read-only
 668
 669                 $status = $this->storeBatch( array( array( $srcPath, $dstZone, $dstRel ) ), $flags );
 670                 if ( $status->successCount == 0 ) {
 671                         $status->ok = false;
 672                 }
 673
 674                 return $status;
 675         }
 676
 677         /**
 678          * Store a batch of files
 679          *
 680          * @param $triplets Array: (src, dest zone, dest rel) triplets as per store()
 681          * @param $flags Integer: bitwise combination of the following flags:
 682          *     self::DELETE_SOURCE     Delete the source file after upload
 683          *     self::OVERWRITE         Overwrite an existing destination file instead of failing
 684          *     self::OVERWRITE_SAME    Overwrite the file if the destination exists and has the
 685          *                             same contents as the source
 686          *     self::SKIP_LOCKING      Skip any file locking when doing the store
 687          * @return FileRepoStatus
 688          */
 689         public function storeBatch( array $triplets, $flags = 0 ) {
 690                 $this->assertWritableRepo(); // fail out if read-only
 691
 692                 $status = $this->newGood();
 693                 $backend = $this->backend; // convenience
 694
 695                 $operations = array();
 696                 $sourceFSFilesToDelete = array(); // cleanup for disk source files
 697                 // Validate each triplet and get the store operation...
 698                 foreach ( $triplets as $triplet ) {
 699                         list( $srcPath, $dstZone, $dstRel ) = $triplet;
 700                         wfDebug( __METHOD__
 701                                 . "( \$src='$srcPath', \$dstZone='$dstZone', \$dstRel='$dstRel' )\n"
 702                         );
 703
 704                         // Resolve destination path
 705                         $root = $this->getZonePath( $dstZone );
 706                         if ( !$root ) {
 707                                 throw new MWException( "Invalid zone: $dstZone" );
 708                         }
 709                         if ( !$this->validateFilename( $dstRel ) ) {
 710                                 throw new MWException( 'Validation error in $dstRel' );
 711                         }
 712                         $dstPath = "$root/$dstRel";
 713                         $dstDir  = dirname( $dstPath );
 714                         // Create destination directories for this triplet
 715                         if ( !$backend->prepare( array( 'dir' => $dstDir ) )->isOK() ) {
 716                                 return $this->newFatal( 'directorycreateerror', $dstDir );
 717                         }
 718
 719                         if ( $dstZone == 'deleted' ) {
 720                                 $this->initDeletedDir( $dstDir );
 721                         }
 722
 723                         // Resolve source to a storage path if virtual
 724                         $srcPath = $this->resolveToStoragePath( $srcPath );
 725
 726                         // Get the appropriate file operation
 727                         if ( FileBackend::isStoragePath( $srcPath ) ) {
 728                                 $opName = ( $flags & self::DELETE_SOURCE ) ? 'move' : 'copy';
 729                         } else {
 730                                 $opName = 'store';
 731                                 if ( $flags & self::DELETE_SOURCE ) {
 732                                         $sourceFSFilesToDelete[] = $srcPath;
 733                                 }
 734                         }
 735                         $operations[] = array(
 736                                 'op'            => $opName,
 737                                 'src'           => $srcPath,
 738                                 'dst'           => $dstPath,
 739                                 'overwrite'     => $flags & self::OVERWRITE,
 740                                 'overwriteSame' => $flags & self::OVERWRITE_SAME,
 741                         );
 742                 }
 743
 744                 // Execute the store operation for each triplet
 745                 $opts = array( 'force' => true );
 746                 if ( $flags & self::SKIP_LOCKING ) {
 747                         $opts['nonLocking'] = true;
 748                 }
 749                 $status->merge( $backend->doOperations( $operations, $opts ) );
 750                 // Cleanup for disk source files...
 751                 foreach ( $sourceFSFilesToDelete as $file ) {
 752                         wfSuppressWarnings();
 753                         unlink( $file ); // FS cleanup
 754                         wfRestoreWarnings();
 755                 }
 756
 757                 return $status;
 758         }
 759
 760         /**
 761          * Deletes a batch of files.
 762          * Each file can be a (zone, rel) pair, virtual url, storage path.
 763          * It will try to delete each file, but ignores any errors that may occur.
 764          *
 765          * @param $pairs array List of files to delete
 766          * @param $flags Integer: bitwise combination of the following flags:
 767          *     self::SKIP_LOCKING      Skip any file locking when doing the deletions
 768          * @return FileRepoStatus
 769          */
 770         public function cleanupBatch( array $files, $flags = 0 ) {
 771                 $this->assertWritableRepo(); // fail out if read-only
 772
 773                 $status = $this->newGood();
 774
 775                 $operations = array();
 776                 foreach ( $files as $path ) {
 777                         if ( is_array( $path ) ) {
 778                                 // This is a pair, extract it
 779                                 list( $zone, $rel ) = $path;
 780                                 $path = $this->getZonePath( $zone ) . "/$rel";
 781                         } else {
 782                                 // Resolve source to a storage path if virtual
 783                                 $path = $this->resolveToStoragePath( $path );
 784                         }
 785                         $operations[] = array( 'op' => 'delete', 'src' => $path );
 786                 }
 787                 // Actually delete files from storage...
 788                 $opts = array( 'force' => true );
 789                 if ( $flags & self::SKIP_LOCKING ) {
 790                         $opts['nonLocking'] = true;
 791                 }
 792                 $status->merge( $this->backend->doOperations( $operations, $opts ) );
 793
 794                 return $status;
 795         }
 796
 797         /**
 798          * Import a file from the local file system into the repo.
 799          * This does no locking nor journaling and overrides existing files.
 800          * This function can be used to write to otherwise read-only foreign repos.
 801          * This is intended for copying generated thumbnails into the repo.
 802          *
 803          * @param $src string File system path
 804          * @param $dst string Virtual URL or storage path
 805          * @return FileRepoStatus
 806          */
 807         final public function quickImport( $src, $dst ) {
 808                 return $this->quickImportBatch( array( array( $src, $dst ) ) );
 809         }
 810
 811         /**
 812          * Purge a file from the repo. This does no locking nor journaling.
 813          * This function can be used to write to otherwise read-only foreign repos.
 814          * This is intended for purging thumbnails.
 815          *
 816          * @param $path string Virtual URL or storage path
 817          * @return FileRepoStatus
 818          */
 819         final public function quickPurge( $path ) {
 820                 return $this->quickPurgeBatch( array( $path ) );
 821         }
 822
 823         /**
 824          * Deletes a directory if empty.
 825          * This function can be used to write to otherwise read-only foreign repos.
 826          *
 827          * @param $dir string Virtual URL (or storage path) of directory to clean
 828          * @return Status
 829          */
 830         public function quickCleanDir( $dir ) {
 831                 $status = $this->newGood();
 832                 $status->merge( $this->backend->clean(
 833                         array( 'dir' => $this->resolveToStoragePath( $dir ) ) ) );
 834
 835                 return $status;
 836         }
 837
 838         /**
 839          * Import a batch of files from the local file system into the repo.
 840          * This does no locking nor journaling and overrides existing files.
 841          * This function can be used to write to otherwise read-only foreign repos.
 842          * This is intended for copying generated thumbnails into the repo.
 843          *
 844          * @param $src Array List of tuples (file system path, virtual URL or storage path)
 845          * @return FileRepoStatus
 846          */
 847         public function quickImportBatch( array $pairs ) {
 848                 $status = $this->newGood();
 849                 $operations = array();
 850                 foreach ( $pairs as $pair ) {
 851                         list ( $src, $dst ) = $pair;
 852                         $operations[] = array(
 853                                 'op'        => 'store',
 854                                 'src'       => $src,
 855                                 'dst'       => $this->resolveToStoragePath( $dst )
 856                         );
 857                         $this->backend->prepare( array( 'dir' => dirname( $dst ) ) );
 858                 }
 859                 $status->merge( $this->backend->doQuickOperations( $operations ) );
 860
 861                 return $status;
 862         }
 863
 864         /**
 865          * Purge a batch of files from the repo.
 866          * This function can be used to write to otherwise read-only foreign repos.
 867          * This does no locking nor journaling and is intended for purging thumbnails.
 868          *
 869          * @param $path Array List of virtual URLs or storage paths
 870          * @return FileRepoStatus
 871          */
 872         public function quickPurgeBatch( array $paths ) {
 873                 $status = $this->newGood();
 874                 $operations = array();
 875                 foreach ( $paths as $path ) {
 876                         $operations[] = array(
 877                                 'op'                  => 'delete',
 878                                 'src'                 => $this->resolveToStoragePath( $path ),
 879                                 'ignoreMissingSource' => true
 880                         );
 881                 }
 882                 $status->merge( $this->backend->doQuickOperations( $operations ) );
 883
 884                 return $status;
 885         }
 886
 887         /**
 888          * Pick a random name in the temp zone and store a file to it.
 889          * Returns a FileRepoStatus object with the file Virtual URL in the value,
 890          * file can later be disposed using FileRepo::freeTemp().
 891          *
 892          * @param $originalName String: the base name of the file as specified
 893          *     by the user. The file extension will be maintained.
 894          * @param $srcPath String: the current location of the file.
 895          * @return FileRepoStatus object with the URL in the value.
 896          */
 897         public function storeTemp( $originalName, $srcPath ) {
 898                 $this->assertWritableRepo(); // fail out if read-only
 899
 900                 $date      = gmdate( "YmdHis" );
 901                 $hashPath  = $this->getHashPath( $originalName );
 902                 $dstRel    = "{$hashPath}{$date}!{$originalName}";
 903                 $dstUrlRel = $hashPath . $date . '!' . rawurlencode( $originalName );
 904
 905                 $result = $this->store( $srcPath, 'temp', $dstRel, self::SKIP_LOCKING );
 906                 $result->value = $this->getVirtualUrl( 'temp' ) . '/' . $dstUrlRel;
 907
 908                 return $result;
 909         }
 910
 911         /**
 912          * Concatenate a list of files into a target file location.
 913          *
 914          * @param $srcPaths Array Ordered list of source virtual URLs/storage paths
 915          * @param $dstPath String Target file system path
 916          * @param $flags Integer: bitwise combination of the following flags:
 917          *     self::DELETE_SOURCE     Delete the source files
 918          * @return FileRepoStatus
 919          */
 920         public function concatenate( array $srcPaths, $dstPath, $flags = 0 ) {
 921                 $this->assertWritableRepo(); // fail out if read-only
 922
 923                 $status = $this->newGood();
 924
 925                 $sources = array();
 926                 $deleteOperations = array(); // post-concatenate ops
 927                 foreach ( $srcPaths as $srcPath ) {
 928                         // Resolve source to a storage path if virtual
 929                         $source = $this->resolveToStoragePath( $srcPath );
 930                         $sources[] = $source; // chunk to merge
 931                         if ( $flags & self::DELETE_SOURCE ) {
 932                                 $deleteOperations[] = array( 'op' => 'delete', 'src' => $source );
 933                         }
 934                 }
 935
 936                 // Concatenate the chunks into one FS file
 937                 $params = array( 'srcs' => $sources, 'dst' => $dstPath );
 938                 $status->merge( $this->backend->concatenate( $params ) );
 939                 if ( !$status->isOK() ) {
 940                         return $status;
 941                 }
 942
 943                 // Delete the sources if required
 944                 if ( $deleteOperations ) {
 945                         $opts = array( 'force' => true );
 946                         $status->merge( $this->backend->doOperations( $deleteOperations, $opts ) );
 947                 }
 948
 949                 // Make sure status is OK, despite any $deleteOperations fatals
 950                 $status->setResult( true );
 951
 952                 return $status;
 953         }
 954
 955         /**
 956          * Remove a temporary file or mark it for garbage collection
 957          *
 958          * @param $virtualUrl String: the virtual URL returned by FileRepo::storeTemp()
 959          * @return Boolean: true on success, false on failure
 960          */
 961         public function freeTemp( $virtualUrl ) {
 962                 $this->assertWritableRepo(); // fail out if read-only
 963
 964                 $temp = "mwrepo://{$this->name}/temp";
 965                 if ( substr( $virtualUrl, 0, strlen( $temp ) ) != $temp ) {
 966                         wfDebug( __METHOD__.": Invalid temp virtual URL\n" );
 967                         return false;
 968                 }
 969                 $path = $this->resolveVirtualUrl( $virtualUrl );
 970
 971                 return $this->cleanupBatch( array( $path ), self::SKIP_LOCKING )->isOK();
 972         }
 973
 974         /**
 975          * Copy or move a file either from a storage path, virtual URL,
 976          * or FS path, into this repository at the specified destination location.
 977          *
 978          * Returns a FileRepoStatus object. On success, the value contains "new" or
 979          * "archived", to indicate whether the file was new with that name.
 980          *
 981          * @param $srcPath String: the source FS path, storage path, or URL
 982          * @param $dstRel String: the destination relative path
 983          * @param $archiveRel String: the relative path where the existing file is to
 984          *        be archived, if there is one. Relative to the public zone root.
 985          * @param $flags Integer: bitfield, may be FileRepo::DELETE_SOURCE to indicate
 986          *        that the source file should be deleted if possible
 987          * @return FileRepoStatus
 988          */
 989         public function publish( $srcPath, $dstRel, $archiveRel, $flags = 0 ) {
 990                 $this->assertWritableRepo(); // fail out if read-only
 991
 992                 $status = $this->publishBatch( array( array( $srcPath, $dstRel, $archiveRel ) ), $flags );
 993                 if ( $status->successCount == 0 ) {
 994                         $status->ok = false;
 995                 }
 996                 if ( isset( $status->value[0] ) ) {
 997                         $status->value = $status->value[0];
 998                 } else {
 999                         $status->value = false;
1000                 }
1001
1002                 return $status;
1003         }
1004
1005         /**
1006          * Publish a batch of files
1007          *
1008          * @param $triplets Array: (source, dest, archive) triplets as per publish()
1009          * @param $flags Integer: bitfield, may be FileRepo::DELETE_SOURCE to indicate
1010          *        that the source files should be deleted if possible
1011          * @return FileRepoStatus
1012          */
1013         public function publishBatch( array $triplets, $flags = 0 ) {
1014                 $this->assertWritableRepo(); // fail out if read-only
1015
1016                 $backend = $this->backend; // convenience
1017                 // Try creating directories
1018                 $status = $this->initZones( 'public' );
1019                 if ( !$status->isOK() ) {
1020                         return $status;
1021                 }
1022
1023                 $status = $this->newGood( array() );
1024
1025                 $operations = array();
1026                 $sourceFSFilesToDelete = array(); // cleanup for disk source files
1027                 // Validate each triplet and get the store operation...
1028                 foreach ( $triplets as $i => $triplet ) {
1029                         list( $srcPath, $dstRel, $archiveRel ) = $triplet;
1030                         // Resolve source to a storage path if virtual
1031                         $srcPath = $this->resolveToStoragePath( $srcPath );
1032                         if ( !$this->validateFilename( $dstRel ) ) {
1033                                 throw new MWException( 'Validation error in $dstRel' );
1034                         }
1035                         if ( !$this->validateFilename( $archiveRel ) ) {
1036                                 throw new MWException( 'Validation error in $archiveRel' );
1037                         }
1038
1039                         $publicRoot = $this->getZonePath( 'public' );
1040                         $dstPath = "$publicRoot/$dstRel";
1041                         $archivePath = "$publicRoot/$archiveRel";
1042
1043                         $dstDir = dirname( $dstPath );
1044                         $archiveDir = dirname( $archivePath );
1045                         // Abort immediately on directory creation errors since they're likely to be repetitive
1046                         if ( !$backend->prepare( array( 'dir' => $dstDir ) )->isOK() ) {
1047                                 return $this->newFatal( 'directorycreateerror', $dstDir );
1048                         }
1049                         if ( !$backend->prepare( array( 'dir' => $archiveDir ) )->isOK() ) {
1050                                 return $this->newFatal( 'directorycreateerror', $archiveDir );
1051                         }
1052
1053                         // Archive destination file if it exists
1054                         if ( $backend->fileExists( array( 'src' => $dstPath ) ) ) {
1055                                 // Check if the archive file exists
1056                                 // This is a sanity check to avoid data loss. In UNIX, the rename primitive
1057                                 // unlinks the destination file if it exists. DB-based synchronisation in
1058                                 // publishBatch's caller should prevent races. In Windows there's no
1059                                 // problem because the rename primitive fails if the destination exists.
1060                                 if ( $backend->fileExists( array( 'src' => $archivePath ) ) ) {
1061                                         $operations[] = array( 'op' => 'null' );
1062                                         continue;
1063                                 } else {
1064                                         $operations[] = array(
1065                                                 'op'           => 'move',
1066                                                 'src'          => $dstPath,
1067                                                 'dst'          => $archivePath
1068                                         );
1069                                 }
1070                                 $status->value[$i] = 'archived';
1071                         } else {
1072                                 $status->value[$i] = 'new';
1073                         }
1074                         // Copy (or move) the source file to the destination
1075                         if ( FileBackend::isStoragePath( $srcPath ) ) {
1076                                 if ( $flags & self::DELETE_SOURCE ) {
1077                                         $operations[] = array(
1078                                                 'op'           => 'move',
1079                                                 'src'          => $srcPath,
1080                                                 'dst'          => $dstPath
1081                                         );
1082                                 } else {
1083                                         $operations[] = array(
1084                                                 'op'           => 'copy',
1085                                                 'src'          => $srcPath,
1086                                                 'dst'          => $dstPath
1087                                         );
1088                                 }
1089                         } else { // FS source path
1090                                 $operations[] = array(
1091                                         'op'           => 'store',
1092                                         'src'          => $srcPath,
1093                                         'dst'          => $dstPath
1094                                 );
1095                                 if ( $flags & self::DELETE_SOURCE ) {
1096                                         $sourceFSFilesToDelete[] = $srcPath;
1097                                 }
1098                         }
1099                 }
1100
1101                 // Execute the operations for each triplet
1102                 $opts = array( 'force' => true );
1103                 $status->merge( $backend->doOperations( $operations, $opts ) );
1104                 // Cleanup for disk source files...
1105                 foreach ( $sourceFSFilesToDelete as $file ) {
1106                         wfSuppressWarnings();
1107                         unlink( $file ); // FS cleanup
1108                         wfRestoreWarnings();
1109                 }
1110
1111                 return $status;
1112         }
1113
1114         /**
1115          * Deletes a directory if empty.
1116          *
1117          * @param $dir string Virtual URL (or storage path) of directory to clean
1118          * @return Status
1119          */
1120         public function cleanDir( $dir ) {
1121                 $this->assertWritableRepo(); // fail out if read-only
1122
1123                 $status = $this->newGood();
1124                 $status->merge( $this->backend->clean(
1125                         array( 'dir' => $this->resolveToStoragePath( $dir ) ) ) );
1126
1127                 return $status;
1128         }
1129
1130         /**
1131          * Checks existence of a a file
1132          *
1133          * @param $file string Virtual URL (or storage path) of file to check
1134          * @return bool
1135          */
1136         public function fileExists( $file ) {
1137                 $result = $this->fileExistsBatch( array( $file ) );
1138                 return $result[0];
1139         }
1140
1141         /**
1142          * Checks existence of an array of files.
1143          *
1144          * @param $files Array: Virtual URLs (or storage paths) of files to check
1145          * @return array|bool Either array of files and existence flags, or false
1146          */
1147         public function fileExistsBatch( array $files ) {
1148                 $result = array();
1149                 foreach ( $files as $key => $file ) {
1150                         $file = $this->resolveToStoragePath( $file );
1151                         $result[$key] = $this->backend->fileExists( array( 'src' => $file ) );
1152                 }
1153                 return $result;
1154         }
1155
1156         /**
1157          * Move a file to the deletion archive.
1158          * If no valid deletion archive exists, this may either delete the file
1159          * or throw an exception, depending on the preference of the repository
1160          *
1161          * @param $srcRel Mixed: relative path for the file to be deleted
1162          * @param $archiveRel Mixed: relative path for the archive location.
1163          *        Relative to a private archive directory.
1164          * @return FileRepoStatus object
1165          */
1166         public function delete( $srcRel, $archiveRel ) {
1167                 $this->assertWritableRepo(); // fail out if read-only
1168
1169                 return $this->deleteBatch( array( array( $srcRel, $archiveRel ) ) );
1170         }
1171
1172         /**
1173          * Move a group of files to the deletion archive.
1174          *
1175          * If no valid deletion archive is configured, this may either delete the
1176          * file or throw an exception, depending on the preference of the repository.
1177          *
1178          * The overwrite policy is determined by the repository -- currently LocalRepo
1179          * assumes a naming scheme in the deleted zone based on content hash, as
1180          * opposed to the public zone which is assumed to be unique.
1181          *
1182          * @param $sourceDestPairs Array of source/destination pairs. Each element
1183          *        is a two-element array containing the source file path relative to the
1184          *        public root in the first element, and the archive file path relative
1185          *        to the deleted zone root in the second element.
1186          * @return FileRepoStatus
1187          */
1188         public function deleteBatch( array $sourceDestPairs ) {
1189                 $this->assertWritableRepo(); // fail out if read-only
1190
1191                 // Try creating directories
1192                 $status = $this->initZones( array( 'public', 'deleted' ) );
1193                 if ( !$status->isOK() ) {
1194                         return $status;
1195                 }
1196
1197                 $status = $this->newGood();
1198
1199                 $backend = $this->backend; // convenience
1200                 $operations = array();
1201                 // Validate filenames and create archive directories
1202                 foreach ( $sourceDestPairs as $pair ) {
1203                         list( $srcRel, $archiveRel ) = $pair;
1204                         if ( !$this->validateFilename( $srcRel ) ) {
1205                                 throw new MWException( __METHOD__.':Validation error in $srcRel' );
1206                         } elseif ( !$this->validateFilename( $archiveRel ) ) {
1207                                 throw new MWException( __METHOD__.':Validation error in $archiveRel' );
1208                         }
1209
1210                         $publicRoot = $this->getZonePath( 'public' );
1211                         $srcPath = "{$publicRoot}/$srcRel";
1212
1213                         $deletedRoot = $this->getZonePath( 'deleted' );
1214                         $archivePath = "{$deletedRoot}/{$archiveRel}";
1215                         $archiveDir = dirname( $archivePath ); // does not touch FS
1216
1217                         // Create destination directories
1218                         if ( !$backend->prepare( array( 'dir' => $archiveDir ) )->isOK() ) {
1219                                 return $this->newFatal( 'directorycreateerror', $archiveDir );
1220                         }
1221                         $this->initDeletedDir( $archiveDir );
1222
1223                         $operations[] = array(
1224                                 'op'            => 'move',
1225                                 'src'           => $srcPath,
1226                                 'dst'           => $archivePath,
1227                                 // We may have 2+ identical files being deleted,
1228                                 // all of which will map to the same destination file
1229                                 'overwriteSame' => true // also see bug 31792
1230                         );
1231                 }
1232
1233                 // Move the files by execute the operations for each pair.
1234                 // We're now committed to returning an OK result, which will
1235                 // lead to the files being moved in the DB also.
1236                 $opts = array( 'force' => true );
1237                 $status->merge( $backend->doOperations( $operations, $opts ) );
1238
1239                 return $status;
1240         }
1241
1242         /**
1243          * Delete files in the deleted directory if they are not referenced in the filearchive table
1244          *
1245          * STUB
1246          */
1247         public function cleanupDeletedBatch( array $storageKeys ) {
1248                 $this->assertWritableRepo();
1249         }
1250
1251         /**
1252          * Get a relative path for a deletion archive key,
1253          * e.g. s/z/a/ for sza251lrxrc1jad41h5mgilp8nysje52.jpg
1254          *
1255          * @return string
1256          */
1257         public function getDeletedHashPath( $key ) {
1258                 $path = '';
1259                 for ( $i = 0; $i < $this->deletedHashLevels; $i++ ) {
1260                         $path .= $key[$i] . '/';
1261                 }
1262                 return $path;
1263         }
1264
1265         /**
1266          * If a path is a virtual URL, resolve it to a storage path.
1267          * Otherwise, just return the path as it is.
1268          *
1269          * @param $path string
1270          * @return string
1271          * @throws MWException
1272          */
1273         protected function resolveToStoragePath( $path ) {
1274                 if ( $this->isVirtualUrl( $path ) ) {
1275                         return $this->resolveVirtualUrl( $path );
1276                 }
1277                 return $path;
1278         }
1279
1280         /**
1281          * Get a local FS copy of a file with a given virtual URL/storage path.
1282          * Temporary files may be purged when the file object falls out of scope.
1283          *
1284          * @param $virtualUrl string
1285          * @return TempFSFile|null Returns null on failure
1286          */
1287         public function getLocalCopy( $virtualUrl ) {
1288                 $path = $this->resolveToStoragePath( $virtualUrl );
1289                 return $this->backend->getLocalCopy( array( 'src' => $path ) );
1290         }
1291
1292         /**
1293          * Get a local FS file with a given virtual URL/storage path.
1294          * The file is either an original or a copy. It should not be changed.
1295          * Temporary files may be purged when the file object falls out of scope.
1296          *
1297          * @param $virtualUrl string
1298          * @return FSFile|null Returns null on failure.
1299          */
1300         public function getLocalReference( $virtualUrl ) {
1301                 $path = $this->resolveToStoragePath( $virtualUrl );
1302                 return $this->backend->getLocalReference( array( 'src' => $path ) );
1303         }
1304
1305         /**
1306          * Get properties of a file with a given virtual URL/storage path.
1307          * Properties should ultimately be obtained via FSFile::getProps().
1308          *
1309          * @param $virtualUrl string
1310          * @return Array
1311          */
1312         public function getFileProps( $virtualUrl ) {
1313                 $path = $this->resolveToStoragePath( $virtualUrl );
1314                 return $this->backend->getFileProps( array( 'src' => $path ) );
1315         }
1316
1317         /**
1318          * Get the timestamp of a file with a given virtual URL/storage path
1319          *
1320          * @param $virtualUrl string
1321          * @return string|bool False on failure
1322          */
1323         public function getFileTimestamp( $virtualUrl ) {
1324                 $path = $this->resolveToStoragePath( $virtualUrl );
1325                 return $this->backend->getFileTimestamp( array( 'src' => $path ) );
1326         }
1327
1328         /**
1329          * Get the sha1 of a file with a given virtual URL/storage path
1330          *
1331          * @param $virtualUrl string
1332          * @return string|bool
1333          */
1334         public function getFileSha1( $virtualUrl ) {
1335                 $path = $this->resolveToStoragePath( $virtualUrl );
1336                 $tmpFile = $this->backend->getLocalReference( array( 'src' => $path ) );
1337                 if ( !$tmpFile ) {
1338                         return false;
1339                 }
1340                 return $tmpFile->getSha1Base36();
1341         }
1342
1343         /**
1344          * Attempt to stream a file with the given virtual URL/storage path
1345          *
1346          * @param $virtualUrl string
1347          * @param $headers Array Additional HTTP headers to send on success
1348          * @return bool Success
1349          */
1350         public function streamFile( $virtualUrl, $headers = array() ) {
1351                 $path = $this->resolveToStoragePath( $virtualUrl );
1352                 $params = array( 'src' => $path, 'headers' => $headers );
1353                 return $this->backend->streamFile( $params )->isOK();
1354         }
1355
1356         /**
1357          * Call a callback function for every public regular file in the repository.
1358          * This only acts on the current version of files, not any old versions.
1359          * May use either the database or the filesystem.
1360          *
1361          * @param $callback Array|string
1362          * @return void
1363          */
1364         public function enumFiles( $callback ) {
1365                 $this->enumFilesInStorage( $callback );
1366         }
1367
1368         /**
1369          * Call a callback function for every public file in the repository.
1370          * May use either the database or the filesystem.
1371          *
1372          * @param $callback Array|string
1373          * @return void
1374          */
1375         protected function enumFilesInStorage( $callback ) {
1376                 $publicRoot = $this->getZonePath( 'public' );
1377                 $numDirs = 1 << ( $this->hashLevels * 4 );
1378                 // Use a priori assumptions about directory structure
1379                 // to reduce the tree height of the scanning process.
1380                 for ( $flatIndex = 0; $flatIndex < $numDirs; $flatIndex++ ) {
1381                         $hexString = sprintf( "%0{$this->hashLevels}x", $flatIndex );
1382                         $path = $publicRoot;
1383                         for ( $hexPos = 0; $hexPos < $this->hashLevels; $hexPos++ ) {
1384                                 $path .= '/' . substr( $hexString, 0, $hexPos + 1 );
1385                         }
1386                         $iterator = $this->backend->getFileList( array( 'dir' => $path ) );
1387                         foreach ( $iterator as $name ) {
1388                                 // Each item returned is a public file
1389                                 call_user_func( $callback, "{$path}/{$name}" );
1390                         }
1391                 }
1392         }
1393
1394         /**
1395          * Determine if a relative path is valid, i.e. not blank or involving directory traveral
1396          *
1397          * @param $filename string
1398          * @return bool
1399          */
1400         public function validateFilename( $filename ) {
1401                 if ( strval( $filename ) == '' ) {
1402                         return false;
1403                 }
1404                 return FileBackend::isPathTraversalFree( $filename );
1405         }
1406
1407         /**
1408          * Get a callback function to use for cleaning error message parameters
1409          *
1410          * @return Array
1411          */
1412         function getErrorCleanupFunction() {
1413                 switch ( $this->pathDisclosureProtection ) {
1414                         case 'none':
1415                         case 'simple': // b/c
1416                                 $callback = array( $this, 'passThrough' );
1417                                 break;
1418                         default: // 'paranoid'
1419                                 $callback = array( $this, 'paranoidClean' );
1420                 }
1421                 return $callback;
1422         }
1423
1424         /**
1425          * Path disclosure protection function
1426          *
1427          * @param $param string
1428          * @return string
1429          */
1430         function paranoidClean( $param ) {
1431                 return '[hidden]';
1432         }
1433
1434         /**
1435          * Path disclosure protection function
1436          *
1437          * @param $param string
1438          * @return string
1439          */
1440         function passThrough( $param ) {
1441                 return $param;
1442         }
1443
1444         /**
1445          * Create a new fatal error
1446          *
1447          * @return FileRepoStatus
1448          */
1449         public function newFatal( $message /*, parameters...*/ ) {
1450                 $params = func_get_args();
1451                 array_unshift( $params, $this );
1452                 return MWInit::callStaticMethod( 'FileRepoStatus', 'newFatal', $params );
1453         }
1454
1455         /**
1456          * Create a new good result
1457          *
1458          * @return FileRepoStatus
1459          */
1460         public function newGood( $value = null ) {
1461                 return FileRepoStatus::newGood( $this, $value );
1462         }
1463
1464         /**
1465          * Checks if there is a redirect named as $title. If there is, return the
1466          * title object. If not, return false.
1467          * STUB
1468          *
1469          * @param $title Title of image
1470          * @return Bool
1471          */
1472         public function checkRedirect( Title $title ) {
1473                 return false;
1474         }
1475
1476         /**
1477          * Invalidates image redirect cache related to that image
1478          * Doesn't do anything for repositories that don't support image redirects.
1479          *
1480          * STUB
1481          * @param $title Title of image
1482          */
1483         public function invalidateImageRedirect( Title $title ) {}
1484
1485         /**
1486          * Get the human-readable name of the repo
1487          *
1488          * @return string
1489          */
1490         public function getDisplayName() {
1491                 // We don't name our own repo, return nothing
1492                 if ( $this->isLocal() ) {
1493                         return null;
1494                 }
1495                 // 'shared-repo-name-wikimediacommons' is used when $wgUseInstantCommons = true
1496                 return wfMessageFallback( 'shared-repo-name-' . $this->name, 'shared-repo' )->text();
1497         }
1498
1499         /**
1500          * Returns true if this the local file repository.
1501          *
1502          * @return bool
1503          */
1504         public function isLocal() {
1505                 return $this->getName() == 'local';
1506         }
1507
1508         /**
1509          * Get a key on the primary cache for this repository.
1510          * Returns false if the repository's cache is not accessible at this site.
1511          * The parameters are the parts of the key, as for wfMemcKey().
1512          *
1513          * STUB
1514          * @return bool
1515          */
1516         public function getSharedCacheKey( /*...*/ ) {
1517                 return false;
1518         }
1519
1520         /**
1521          * Get a key for this repo in the local cache domain. These cache keys are
1522          * not shared with remote instances of the repo.
1523          * The parameters are the parts of the key, as for wfMemcKey().
1524          *
1525          * @return string
1526          */
1527         public function getLocalCacheKey( /*...*/ ) {
1528                 $args = func_get_args();
1529                 array_unshift( $args, 'filerepo', $this->getName() );
1530                 return call_user_func_array( 'wfMemcKey', $args );
1531         }
1532
1533         /**
1534          * Get an temporary FileRepo associated with this repo.
1535          * Files will be created in the temp zone of this repo and
1536          * thumbnails in a /temp subdirectory in thumb zone of this repo.
1537          * It will have the same backend as this repo.
1538          *
1539          * @return TempFileRepo
1540          */
1541         public function getTempRepo() {
1542                 return new TempFileRepo( array(
1543                         'name'      => "{$this->name}-temp",
1544                         'backend'   => $this->backend,
1545                         'zones'     => array(
1546                                 'public' => array(
1547                                         'container' => $this->zones['temp']['container'],
1548                                         'directory' => $this->zones['temp']['directory']
1549                                 ),
1550                                 'thumb'  => array(
1551                                         'container' => $this->zones['thumb']['container'],
1552                                         'directory' => ( $this->zones['thumb']['directory'] == '' )
1553                                                 ? 'temp'
1554                                                 : $this->zones['thumb']['directory'] . '/temp'
1555                                 )
1556                         ),
1557                         'url'        => $this->getZoneUrl( 'temp' ),
1558                         'thumbUrl'   => $this->getZoneUrl( 'thumb' ) . '/temp',
1559                         'hashLevels' => $this->hashLevels // performance
1560                 ) );
1561         }
1562
1563         /**
1564          * Get an UploadStash associated with this repo.
1565          *
1566          * @return UploadStash
1567          */
1568         public function getUploadStash() {
1569                 return new UploadStash( $this );
1570         }
1571
1572         /**
1573          * Throw an exception if this repo is read-only by design.
1574          * This does not and should not check getReadOnlyReason().
1575          *
1576          * @return void
1577          * @throws MWException
1578          */
1579         protected function assertWritableRepo() {}
1580 }
1581
1582 /**
1583  * FileRepo for temporary files created via FileRepo::getTempRepo()
1584  */
1585 class TempFileRepo extends FileRepo {
1586         public function getTempRepo() {
1587                 throw new MWException( "Cannot get a temp repo from a temp repo." );
1588         }
1589 }