includes/filerepo/file/LocalFile.php

   1 <?php
   2 /**
   3  * Local file in the wiki's own database.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  * @ingroup FileAbstraction
  22  */
  23
  24 /**
  25  * Bump this number when serialized cache records may be incompatible.
  26  */
  27 define( 'MW_FILE_VERSION', 9 );
  28
  29 /**
  30  * Class to represent a local file in the wiki's own database
  31  *
  32  * Provides methods to retrieve paths (physical, logical, URL),
  33  * to generate image thumbnails or for uploading.
  34  *
  35  * Note that only the repo object knows what its file class is called. You should
  36  * never name a file class explictly outside of the repo class. Instead use the
  37  * repo's factory functions to generate file objects, for example:
  38  *
  39  * RepoGroup::singleton()->getLocalRepo()->newFile( $title );
  40  *
  41  * The convenience functions wfLocalFile() and wfFindFile() should be sufficient
  42  * in most cases.
  43  *
  44  * @ingroup FileAbstraction
  45  */
  46 class LocalFile extends File {
  47         const CACHE_FIELD_MAX_LEN = 1000;
  48
  49         /** @var bool Does the file exist on disk? (loadFromXxx) */
  50         protected $fileExists;
  51
  52         /** @var int Image width */
  53         protected $width;
  54
  55         /** @var int Image height */
  56         protected $height;
  57
  58         /** @var int Returned by getimagesize (loadFromXxx) */
  59         protected $bits;
  60
  61         /** @var string MEDIATYPE_xxx (bitmap, drawing, audio...) */
  62         protected $media_type;
  63
  64         /** @var string MIME type, determined by MimeMagic::guessMimeType */
  65         protected $mime;
  66
  67         /** @var int Size in bytes (loadFromXxx) */
  68         protected $size;
  69
  70         /** @var string Handler-specific metadata */
  71         protected $metadata;
  72
  73         /** @var string SHA-1 base 36 content hash */
  74         protected $sha1;
  75
  76         /** @var bool Whether or not core data has been loaded from the database (loadFromXxx) */
  77         protected $dataLoaded;
  78
  79         /** @var bool Whether or not lazy-loaded data has been loaded from the database */
  80         protected $extraDataLoaded;
  81
  82         /** @var int Bitfield akin to rev_deleted */
  83         protected $deleted;
  84
  85         /** @var string */
  86         protected $repoClass = 'LocalRepo';
  87
  88         /** @var int Number of line to return by nextHistoryLine() (constructor) */
  89         private $historyLine;
  90
  91         /** @var int Result of the query for the file's history (nextHistoryLine) */
  92         private $historyRes;
  93
  94         /** @var string Major MIME type */
  95         private $major_mime;
  96
  97         /** @var string Minor MIME type */
  98         private $minor_mime;
  99
 100         /** @var string Upload timestamp */
 101         private $timestamp;
 102
 103         /** @var int User ID of uploader */
 104         private $user;
 105
 106         /** @var string User name of uploader */
 107         private $user_text;
 108
 109         /** @var string Description of current revision of the file */
 110         private $description;
 111
 112         /** @var string TS_MW timestamp of the last change of the file description */
 113         private $descriptionTouched;
 114
 115         /** @var bool Whether the row was upgraded on load */
 116         private $upgraded;
 117
 118         /** @var bool True if the image row is locked */
 119         private $locked;
 120
 121         /** @var bool True if the image row is locked with a lock initiated transaction */
 122         private $lockedOwnTrx;
 123
 124         /** @var bool True if file is not present in file system. Not to be cached in memcached */
 125         private $missing;
 126
 127         // @note: higher than IDBAccessObject constants
 128         const LOAD_ALL = 16; // integer; load all the lazy fields too (like metadata)
 129
 130         /**
 131          * Create a LocalFile from a title
 132          * Do not call this except from inside a repo class.
 133          *
 134          * Note: $unused param is only here to avoid an E_STRICT
 135          *
 136          * @param Title $title
 137          * @param FileRepo $repo
 138          * @param null $unused
 139          *
 140          * @return LocalFile
 141          */
 142         static function newFromTitle( $title, $repo, $unused = null ) {
 143                 return new self( $title, $repo );
 144         }
 145
 146         /**
 147          * Create a LocalFile from a title
 148          * Do not call this except from inside a repo class.
 149          *
 150          * @param stdClass $row
 151          * @param FileRepo $repo
 152          *
 153          * @return LocalFile
 154          */
 155         static function newFromRow( $row, $repo ) {
 156                 $title = Title::makeTitle( NS_FILE, $row->img_name );
 157                 $file = new self( $title, $repo );
 158                 $file->loadFromRow( $row );
 159
 160                 return $file;
 161         }
 162
 163         /**
 164          * Create a LocalFile from a SHA-1 key
 165          * Do not call this except from inside a repo class.
 166          *
 167          * @param string $sha1 Base-36 SHA-1
 168          * @param LocalRepo $repo
 169          * @param string|bool $timestamp MW_timestamp (optional)
 170          * @return bool|LocalFile
 171          */
 172         static function newFromKey( $sha1, $repo, $timestamp = false ) {
 173                 $dbr = $repo->getSlaveDB();
 174
 175                 $conds = array( 'img_sha1' => $sha1 );
 176                 if ( $timestamp ) {
 177                         $conds['img_timestamp'] = $dbr->timestamp( $timestamp );
 178                 }
 179
 180                 $row = $dbr->selectRow( 'image', self::selectFields(), $conds, __METHOD__ );
 181                 if ( $row ) {
 182                         return self::newFromRow( $row, $repo );
 183                 } else {
 184                         return false;
 185                 }
 186         }
 187
 188         /**
 189          * Fields in the image table
 190          * @return array
 191          */
 192         static function selectFields() {
 193                 return array(
 194                         'img_name',
 195                         'img_size',
 196                         'img_width',
 197                         'img_height',
 198                         'img_metadata',
 199                         'img_bits',
 200                         'img_media_type',
 201                         'img_major_mime',
 202                         'img_minor_mime',
 203                         'img_description',
 204                         'img_user',
 205                         'img_user_text',
 206                         'img_timestamp',
 207                         'img_sha1',
 208                 );
 209         }
 210
 211         /**
 212          * Constructor.
 213          * Do not call this except from inside a repo class.
 214          * @param Title $title
 215          * @param FileRepo $repo
 216          */
 217         function __construct( $title, $repo ) {
 218                 parent::__construct( $title, $repo );
 219
 220                 $this->metadata = '';
 221                 $this->historyLine = 0;
 222                 $this->historyRes = null;
 223                 $this->dataLoaded = false;
 224                 $this->extraDataLoaded = false;
 225
 226                 $this->assertRepoDefined();
 227                 $this->assertTitleDefined();
 228         }
 229
 230         /**
 231          * Get the memcached key for the main data for this file, or false if
 232          * there is no access to the shared cache.
 233          * @return string|bool
 234          */
 235         function getCacheKey() {
 236                 $hashedName = md5( $this->getName() );
 237
 238                 return $this->repo->getSharedCacheKey( 'file', $hashedName );
 239         }
 240
 241         /**
 242          * Try to load file metadata from memcached. Returns true on success.
 243          * @return bool
 244          */
 245         function loadFromCache() {
 246                 $this->dataLoaded = false;
 247                 $this->extraDataLoaded = false;
 248                 $key = $this->getCacheKey();
 249
 250                 if ( !$key ) {
 251                         return false;
 252                 }
 253
 254                 $cache = ObjectCache::getMainWANInstance();
 255                 $cachedValues = $cache->get( $key );
 256
 257                 // Check if the key existed and belongs to this version of MediaWiki
 258                 if ( is_array( $cachedValues ) && $cachedValues['version'] == MW_FILE_VERSION ) {
 259                         wfDebug( "Pulling file metadata from cache key $key\n" );
 260                         $this->fileExists = $cachedValues['fileExists'];
 261                         if ( $this->fileExists ) {
 262                                 $this->setProps( $cachedValues );
 263                         }
 264                         $this->dataLoaded = true;
 265                         $this->extraDataLoaded = true;
 266                         foreach ( $this->getLazyCacheFields( '' ) as $field ) {
 267                                 $this->extraDataLoaded = $this->extraDataLoaded && isset( $cachedValues[$field] );
 268                         }
 269                 }
 270
 271                 if ( $this->dataLoaded ) {
 272                         wfIncrStats( 'image_cache.hit' );
 273                 } else {
 274                         wfIncrStats( 'image_cache.miss' );
 275                 }
 276
 277                 return $this->dataLoaded;
 278         }
 279
 280         /**
 281          * Save the file metadata to memcached
 282          */
 283         function saveToCache() {
 284                 $this->load();
 285
 286                 $key = $this->getCacheKey();
 287                 if ( !$key ) {
 288                         return;
 289                 }
 290
 291                 $fields = $this->getCacheFields( '' );
 292                 $cacheVal = array( 'version' => MW_FILE_VERSION );
 293                 $cacheVal['fileExists'] = $this->fileExists;
 294
 295                 if ( $this->fileExists ) {
 296                         foreach ( $fields as $field ) {
 297                                 $cacheVal[$field] = $this->$field;
 298                         }
 299                 }
 300
 301                 // Strip off excessive entries from the subset of fields that can become large.
 302                 // If the cache value gets to large it will not fit in memcached and nothing will
 303                 // get cached at all, causing master queries for any file access.
 304                 foreach ( $this->getLazyCacheFields( '' ) as $field ) {
 305                         if ( isset( $cacheVal[$field] ) && strlen( $cacheVal[$field] ) > 100 * 1024 ) {
 306                                 unset( $cacheVal[$field] ); // don't let the value get too big
 307                         }
 308                 }
 309
 310                 // Cache presence for 1 week and negatives for 1 day
 311                 $ttl = $this->fileExists ? 86400 * 7 : 86400;
 312                 $opts = Database::getCacheSetOptions( $this->repo->getSlaveDB() );
 313                 ObjectCache::getMainWANInstance()->set( $key, $cacheVal, $ttl, $opts );
 314         }
 315
 316         /**
 317          * Purge the file object/metadata cache
 318          */
 319         public function invalidateCache() {
 320                 $key = $this->getCacheKey();
 321                 if ( !$key ) {
 322                         return;
 323                 }
 324
 325                 $this->repo->getMasterDB()->onTransactionPreCommitOrIdle( function() use ( $key ) {
 326                         ObjectCache::getMainWANInstance()->delete( $key );
 327                 } );
 328         }
 329
 330         /**
 331          * Load metadata from the file itself
 332          */
 333         function loadFromFile() {
 334                 $props = $this->repo->getFileProps( $this->getVirtualUrl() );
 335                 $this->setProps( $props );
 336         }
 337
 338         /**
 339          * @param string $prefix
 340          * @return array
 341          */
 342         function getCacheFields( $prefix = 'img_' ) {
 343                 static $fields = array( 'size', 'width', 'height', 'bits', 'media_type',
 344                         'major_mime', 'minor_mime', 'metadata', 'timestamp', 'sha1', 'user',
 345                         'user_text', 'description' );
 346                 static $results = array();
 347
 348                 if ( $prefix == '' ) {
 349                         return $fields;
 350                 }
 351
 352                 if ( !isset( $results[$prefix] ) ) {
 353                         $prefixedFields = array();
 354                         foreach ( $fields as $field ) {
 355                                 $prefixedFields[] = $prefix . $field;
 356                         }
 357                         $results[$prefix] = $prefixedFields;
 358                 }
 359
 360                 return $results[$prefix];
 361         }
 362
 363         /**
 364          * @param string $prefix
 365          * @return array
 366          */
 367         function getLazyCacheFields( $prefix = 'img_' ) {
 368                 static $fields = array( 'metadata' );
 369                 static $results = array();
 370
 371                 if ( $prefix == '' ) {
 372                         return $fields;
 373                 }
 374
 375                 if ( !isset( $results[$prefix] ) ) {
 376                         $prefixedFields = array();
 377                         foreach ( $fields as $field ) {
 378                                 $prefixedFields[] = $prefix . $field;
 379                         }
 380                         $results[$prefix] = $prefixedFields;
 381                 }
 382
 383                 return $results[$prefix];
 384         }
 385
 386         /**
 387          * Load file metadata from the DB
 388          * @param int $flags
 389          */
 390         function loadFromDB( $flags = 0 ) {
 391                 $fname = get_class( $this ) . '::' . __FUNCTION__;
 392
 393                 # Unconditionally set loaded=true, we don't want the accessors constantly rechecking
 394                 $this->dataLoaded = true;
 395                 $this->extraDataLoaded = true;
 396
 397                 $dbr = ( $flags & self::READ_LATEST )
 398                         ? $this->repo->getMasterDB()
 399                         : $this->repo->getSlaveDB();
 400
 401                 $row = $dbr->selectRow( 'image', $this->getCacheFields( 'img_' ),
 402                         array( 'img_name' => $this->getName() ), $fname );
 403
 404                 if ( $row ) {
 405                         $this->loadFromRow( $row );
 406                 } else {
 407                         $this->fileExists = false;
 408                 }
 409         }
 410
 411         /**
 412          * Load lazy file metadata from the DB.
 413          * This covers fields that are sometimes not cached.
 414          */
 415         protected function loadExtraFromDB() {
 416                 $fname = get_class( $this ) . '::' . __FUNCTION__;
 417
 418                 # Unconditionally set loaded=true, we don't want the accessors constantly rechecking
 419                 $this->extraDataLoaded = true;
 420
 421                 $fieldMap = $this->loadFieldsWithTimestamp( $this->repo->getSlaveDB(), $fname );
 422                 if ( !$fieldMap ) {
 423                         $fieldMap = $this->loadFieldsWithTimestamp( $this->repo->getMasterDB(), $fname );
 424                 }
 425
 426                 if ( $fieldMap ) {
 427                         foreach ( $fieldMap as $name => $value ) {
 428                                 $this->$name = $value;
 429                         }
 430                 } else {
 431                         throw new MWException( "Could not find data for image '{$this->getName()}'." );
 432                 }
 433         }
 434
 435         /**
 436          * @param IDatabase $dbr
 437          * @param string $fname
 438          * @return array|bool
 439          */
 440         private function loadFieldsWithTimestamp( $dbr, $fname ) {
 441                 $fieldMap = false;
 442
 443                 $row = $dbr->selectRow( 'image', $this->getLazyCacheFields( 'img_' ),
 444                         array( 'img_name' => $this->getName(), 'img_timestamp' => $this->getTimestamp() ),
 445                         $fname );
 446                 if ( $row ) {
 447                         $fieldMap = $this->unprefixRow( $row, 'img_' );
 448                 } else {
 449                         # File may have been uploaded over in the meantime; check the old versions
 450                         $row = $dbr->selectRow( 'oldimage', $this->getLazyCacheFields( 'oi_' ),
 451                                 array( 'oi_name' => $this->getName(), 'oi_timestamp' => $this->getTimestamp() ),
 452                                 $fname );
 453                         if ( $row ) {
 454                                 $fieldMap = $this->unprefixRow( $row, 'oi_' );
 455                         }
 456                 }
 457
 458                 return $fieldMap;
 459         }
 460
 461         /**
 462          * @param array|object $row
 463          * @param string $prefix
 464          * @throws MWException
 465          * @return array
 466          */
 467         protected function unprefixRow( $row, $prefix = 'img_' ) {
 468                 $array = (array)$row;
 469                 $prefixLength = strlen( $prefix );
 470
 471                 // Sanity check prefix once
 472                 if ( substr( key( $array ), 0, $prefixLength ) !== $prefix ) {
 473                         throw new MWException( __METHOD__ . ': incorrect $prefix parameter' );
 474                 }
 475
 476                 $decoded = array();
 477                 foreach ( $array as $name => $value ) {
 478                         $decoded[substr( $name, $prefixLength )] = $value;
 479                 }
 480
 481                 return $decoded;
 482         }
 483
 484         /**
 485          * Decode a row from the database (either object or array) to an array
 486          * with timestamps and MIME types decoded, and the field prefix removed.
 487          * @param object $row
 488          * @param string $prefix
 489          * @throws MWException
 490          * @return array
 491          */
 492         function decodeRow( $row, $prefix = 'img_' ) {
 493                 $decoded = $this->unprefixRow( $row, $prefix );
 494
 495                 $decoded['timestamp'] = wfTimestamp( TS_MW, $decoded['timestamp'] );
 496
 497                 $decoded['metadata'] = $this->repo->getSlaveDB()->decodeBlob( $decoded['metadata'] );
 498
 499                 if ( empty( $decoded['major_mime'] ) ) {
 500                         $decoded['mime'] = 'unknown/unknown';
 501                 } else {
 502                         if ( !$decoded['minor_mime'] ) {
 503                                 $decoded['minor_mime'] = 'unknown';
 504                         }
 505                         $decoded['mime'] = $decoded['major_mime'] . '/' . $decoded['minor_mime'];
 506                 }
 507
 508                 // Trim zero padding from char/binary field
 509                 $decoded['sha1'] = rtrim( $decoded['sha1'], "\0" );
 510
 511                 // Normalize some fields to integer type, per their database definition.
 512                 // Use unary + so that overflows will be upgraded to double instead of
 513                 // being trucated as with intval(). This is important to allow >2GB
 514                 // files on 32-bit systems.
 515                 foreach ( array( 'size', 'width', 'height', 'bits' ) as $field ) {
 516                         $decoded[$field] = +$decoded[$field];
 517                 }
 518
 519                 return $decoded;
 520         }
 521
 522         /**
 523          * Load file metadata from a DB result row
 524          *
 525          * @param object $row
 526          * @param string $prefix
 527          */
 528         function loadFromRow( $row, $prefix = 'img_' ) {
 529                 $this->dataLoaded = true;
 530                 $this->extraDataLoaded = true;
 531
 532                 $array = $this->decodeRow( $row, $prefix );
 533
 534                 foreach ( $array as $name => $value ) {
 535                         $this->$name = $value;
 536                 }
 537
 538                 $this->fileExists = true;
 539                 $this->maybeUpgradeRow();
 540         }
 541
 542         /**
 543          * Load file metadata from cache or DB, unless already loaded
 544          * @param int $flags
 545          */
 546         function load( $flags = 0 ) {
 547                 if ( !$this->dataLoaded ) {
 548                         if ( ( $flags & self::READ_LATEST ) || !$this->loadFromCache() ) {
 549                                 $this->loadFromDB( $flags );
 550                                 $this->saveToCache();
 551                         }
 552                         $this->dataLoaded = true;
 553                 }
 554                 if ( ( $flags & self::LOAD_ALL ) && !$this->extraDataLoaded ) {
 555                         // @note: loads on name/timestamp to reduce race condition problems
 556                         $this->loadExtraFromDB();
 557                 }
 558         }
 559
 560         /**
 561          * Upgrade a row if it needs it
 562          */
 563         function maybeUpgradeRow() {
 564                 global $wgUpdateCompatibleMetadata;
 565                 if ( wfReadOnly() ) {
 566                         return;
 567                 }
 568
 569                 if ( is_null( $this->media_type ) ||
 570                         $this->mime == 'image/svg'
 571                 ) {
 572                         $this->upgradeRow();
 573                         $this->upgraded = true;
 574                 } else {
 575                         $handler = $this->getHandler();
 576                         if ( $handler ) {
 577                                 $validity = $handler->isMetadataValid( $this, $this->getMetadata() );
 578                                 if ( $validity === MediaHandler::METADATA_BAD
 579                                         || ( $validity === MediaHandler::METADATA_COMPATIBLE && $wgUpdateCompatibleMetadata )
 580                                 ) {
 581                                         $this->upgradeRow();
 582                                         $this->upgraded = true;
 583                                 }
 584                         }
 585                 }
 586         }
 587
 588         function getUpgraded() {
 589                 return $this->upgraded;
 590         }
 591
 592         /**
 593          * Fix assorted version-related problems with the image row by reloading it from the file
 594          */
 595         function upgradeRow() {
 596
 597                 $this->lock(); // begin
 598
 599                 $this->loadFromFile();
 600
 601                 # Don't destroy file info of missing files
 602                 if ( !$this->fileExists ) {
 603                         $this->unlock();
 604                         wfDebug( __METHOD__ . ": file does not exist, aborting\n" );
 605
 606                         return;
 607                 }
 608
 609                 $dbw = $this->repo->getMasterDB();
 610                 list( $major, $minor ) = self::splitMime( $this->mime );
 611
 612                 if ( wfReadOnly() ) {
 613                         $this->unlock();
 614
 615                         return;
 616                 }
 617                 wfDebug( __METHOD__ . ': upgrading ' . $this->getName() . " to the current schema\n" );
 618
 619                 $dbw->update( 'image',
 620                         array(
 621                                 'img_size' => $this->size, // sanity
 622                                 'img_width' => $this->width,
 623                                 'img_height' => $this->height,
 624                                 'img_bits' => $this->bits,
 625                                 'img_media_type' => $this->media_type,
 626                                 'img_major_mime' => $major,
 627                                 'img_minor_mime' => $minor,
 628                                 'img_metadata' => $dbw->encodeBlob( $this->metadata ),
 629                                 'img_sha1' => $this->sha1,
 630                         ),
 631                         array( 'img_name' => $this->getName() ),
 632                         __METHOD__
 633                 );
 634
 635                 $this->invalidateCache();
 636
 637                 $this->unlock(); // done
 638
 639         }
 640
 641         /**
 642          * Set properties in this object to be equal to those given in the
 643          * associative array $info. Only cacheable fields can be set.
 644          * All fields *must* be set in $info except for getLazyCacheFields().
 645          *
 646          * If 'mime' is given, it will be split into major_mime/minor_mime.
 647          * If major_mime/minor_mime are given, $this->mime will also be set.
 648          *
 649          * @param array $info
 650          */
 651         function setProps( $info ) {
 652                 $this->dataLoaded = true;
 653                 $fields = $this->getCacheFields( '' );
 654                 $fields[] = 'fileExists';
 655
 656                 foreach ( $fields as $field ) {
 657                         if ( isset( $info[$field] ) ) {
 658                                 $this->$field = $info[$field];
 659                         }
 660                 }
 661
 662                 // Fix up mime fields
 663                 if ( isset( $info['major_mime'] ) ) {
 664                         $this->mime = "{$info['major_mime']}/{$info['minor_mime']}";
 665                 } elseif ( isset( $info['mime'] ) ) {
 666                         $this->mime = $info['mime'];
 667                         list( $this->major_mime, $this->minor_mime ) = self::splitMime( $this->mime );
 668                 }
 669         }
 670
 671         /** splitMime inherited */
 672         /** getName inherited */
 673         /** getTitle inherited */
 674         /** getURL inherited */
 675         /** getViewURL inherited */
 676         /** getPath inherited */
 677         /** isVisible inherited */
 678
 679         /**
 680          * @return bool
 681          */
 682         function isMissing() {
 683                 if ( $this->missing === null ) {
 684                         list( $fileExists ) = $this->repo->fileExists( $this->getVirtualUrl() );
 685                         $this->missing = !$fileExists;
 686                 }
 687
 688                 return $this->missing;
 689         }
 690
 691         /**
 692          * Return the width of the image
 693          *
 694          * @param int $page
 695          * @return int
 696          */
 697         public function getWidth( $page = 1 ) {
 698                 $this->load();
 699
 700                 if ( $this->isMultipage() ) {
 701                         $handler = $this->getHandler();
 702                         if ( !$handler ) {
 703                                 return 0;
 704                         }
 705                         $dim = $handler->getPageDimensions( $this, $page );
 706                         if ( $dim ) {
 707                                 return $dim['width'];
 708                         } else {
 709                                 // For non-paged media, the false goes through an
 710                                 // intval, turning failure into 0, so do same here.
 711                                 return 0;
 712                         }
 713                 } else {
 714                         return $this->width;
 715                 }
 716         }
 717
 718         /**
 719          * Return the height of the image
 720          *
 721          * @param int $page
 722          * @return int
 723          */
 724         public function getHeight( $page = 1 ) {
 725                 $this->load();
 726
 727                 if ( $this->isMultipage() ) {
 728                         $handler = $this->getHandler();
 729                         if ( !$handler ) {
 730                                 return 0;
 731                         }
 732                         $dim = $handler->getPageDimensions( $this, $page );
 733                         if ( $dim ) {
 734                                 return $dim['height'];
 735                         } else {
 736                                 // For non-paged media, the false goes through an
 737                                 // intval, turning failure into 0, so do same here.
 738                                 return 0;
 739                         }
 740                 } else {
 741                         return $this->height;
 742                 }
 743         }
 744
 745         /**
 746          * Returns ID or name of user who uploaded the file
 747          *
 748          * @param string $type 'text' or 'id'
 749          * @return int|string
 750          */
 751         function getUser( $type = 'text' ) {
 752                 $this->load();
 753
 754                 if ( $type == 'text' ) {
 755                         return $this->user_text;
 756                 } elseif ( $type == 'id' ) {
 757                         return (int)$this->user;
 758                 }
 759         }
 760
 761         /**
 762          * Get handler-specific metadata
 763          * @return string
 764          */
 765         function getMetadata() {
 766                 $this->load( self::LOAD_ALL ); // large metadata is loaded in another step
 767                 return $this->metadata;
 768         }
 769
 770         /**
 771          * @return int
 772          */
 773         function getBitDepth() {
 774                 $this->load();
 775
 776                 return (int)$this->bits;
 777         }
 778
 779         /**
 780          * Returns the size of the image file, in bytes
 781          * @return int
 782          */
 783         public function getSize() {
 784                 $this->load();
 785
 786                 return $this->size;
 787         }
 788
 789         /**
 790          * Returns the MIME type of the file.
 791          * @return string
 792          */
 793         function getMimeType() {
 794                 $this->load();
 795
 796                 return $this->mime;
 797         }
 798
 799         /**
 800          * Returns the type of the media in the file.
 801          * Use the value returned by this function with the MEDIATYPE_xxx constants.
 802          * @return string
 803          */
 804         function getMediaType() {
 805                 $this->load();
 806
 807                 return $this->media_type;
 808         }
 809
 810         /** canRender inherited */
 811         /** mustRender inherited */
 812         /** allowInlineDisplay inherited */
 813         /** isSafeFile inherited */
 814         /** isTrustedFile inherited */
 815
 816         /**
 817          * Returns true if the file exists on disk.
 818          * @return bool Whether file exist on disk.
 819          */
 820         public function exists() {
 821                 $this->load();
 822
 823                 return $this->fileExists;
 824         }
 825
 826         /** getTransformScript inherited */
 827         /** getUnscaledThumb inherited */
 828         /** thumbName inherited */
 829         /** createThumb inherited */
 830         /** transform inherited */
 831
 832         /** getHandler inherited */
 833         /** iconThumb inherited */
 834         /** getLastError inherited */
 835
 836         /**
 837          * Get all thumbnail names previously generated for this file
 838          * @param string|bool $archiveName Name of an archive file, default false
 839          * @return array First element is the base dir, then files in that base dir.
 840          */
 841         function getThumbnails( $archiveName = false ) {
 842                 if ( $archiveName ) {
 843                         $dir = $this->getArchiveThumbPath( $archiveName );
 844                 } else {
 845                         $dir = $this->getThumbPath();
 846                 }
 847
 848                 $backend = $this->repo->getBackend();
 849                 $files = array( $dir );
 850                 try {
 851                         $iterator = $backend->getFileList( array( 'dir' => $dir ) );
 852                         foreach ( $iterator as $file ) {
 853                                 $files[] = $file;
 854                         }
 855                 } catch ( FileBackendError $e ) {
 856                 } // suppress (bug 54674)
 857
 858                 return $files;
 859         }
 860
 861         /**
 862          * Refresh metadata in memcached, but don't touch thumbnails or squid
 863          */
 864         function purgeMetadataCache() {
 865                 $this->invalidateCache();
 866         }
 867
 868         /**
 869          * Delete all previously generated thumbnails, refresh metadata in memcached and purge the squid.
 870          *
 871          * @param array $options An array potentially with the key forThumbRefresh.
 872          *
 873          * @note This used to purge old thumbnails by default as well, but doesn't anymore.
 874          */
 875         function purgeCache( $options = array() ) {
 876                 // Refresh metadata cache
 877                 $this->purgeMetadataCache();
 878
 879                 // Delete thumbnails
 880                 $this->purgeThumbnails( $options );
 881
 882                 // Purge squid cache for this file
 883                 SquidUpdate::purge( array( $this->getURL() ) );
 884         }
 885
 886         /**
 887          * Delete cached transformed files for an archived version only.
 888          * @param string $archiveName Name of the archived file
 889          */
 890         function purgeOldThumbnails( $archiveName ) {
 891                 global $wgUseSquid;
 892
 893                 // Get a list of old thumbnails and URLs
 894                 $files = $this->getThumbnails( $archiveName );
 895
 896                 // Purge any custom thumbnail caches
 897                 Hooks::run( 'LocalFilePurgeThumbnails', array( $this, $archiveName ) );
 898
 899                 $dir = array_shift( $files );
 900                 $this->purgeThumbList( $dir, $files );
 901
 902                 // Purge the squid
 903                 if ( $wgUseSquid ) {
 904                         $urls = array();
 905                         foreach ( $files as $file ) {
 906                                 $urls[] = $this->getArchiveThumbUrl( $archiveName, $file );
 907                         }
 908                         SquidUpdate::purge( $urls );
 909                 }
 910
 911         }
 912
 913         /**
 914          * Delete cached transformed files for the current version only.
 915          * @param array $options
 916          */
 917         public function purgeThumbnails( $options = array() ) {
 918                 global $wgUseSquid;
 919
 920                 // Delete thumbnails
 921                 $files = $this->getThumbnails();
 922                 // Always purge all files from squid regardless of handler filters
 923                 $urls = array();
 924                 if ( $wgUseSquid ) {
 925                         foreach ( $files as $file ) {
 926                                 $urls[] = $this->getThumbUrl( $file );
 927                         }
 928                         array_shift( $urls ); // don't purge directory
 929                 }
 930
 931                 // Give media handler a chance to filter the file purge list
 932                 if ( !empty( $options['forThumbRefresh'] ) ) {
 933                         $handler = $this->getHandler();
 934                         if ( $handler ) {
 935                                 $handler->filterThumbnailPurgeList( $files, $options );
 936                         }
 937                 }
 938
 939                 // Purge any custom thumbnail caches
 940                 Hooks::run( 'LocalFilePurgeThumbnails', array( $this, false ) );
 941
 942                 $dir = array_shift( $files );
 943                 $this->purgeThumbList( $dir, $files );
 944
 945                 // Purge the squid
 946                 if ( $wgUseSquid ) {
 947                         SquidUpdate::purge( $urls );
 948                 }
 949
 950         }
 951
 952         /**
 953          * Delete a list of thumbnails visible at urls
 954          * @param string $dir Base dir of the files.
 955          * @param array $files Array of strings: relative filenames (to $dir)
 956          */
 957         protected function purgeThumbList( $dir, $files ) {
 958                 $fileListDebug = strtr(
 959                         var_export( $files, true ),
 960                         array( "\n" => '' )
 961                 );
 962                 wfDebug( __METHOD__ . ": $fileListDebug\n" );
 963
 964                 $purgeList = array();
 965                 foreach ( $files as $file ) {
 966                         # Check that the base file name is part of the thumb name
 967                         # This is a basic sanity check to avoid erasing unrelated directories
 968                         if ( strpos( $file, $this->getName() ) !== false
 969                                 || strpos( $file, "-thumbnail" ) !== false // "short" thumb name
 970                         ) {
 971                                 $purgeList[] = "{$dir}/{$file}";
 972                         }
 973                 }
 974
 975                 # Delete the thumbnails
 976                 $this->repo->quickPurgeBatch( $purgeList );
 977                 # Clear out the thumbnail directory if empty
 978                 $this->repo->quickCleanDir( $dir );
 979         }
 980
 981         /** purgeDescription inherited */
 982         /** purgeEverything inherited */
 983
 984         /**
 985          * @param int $limit Optional: Limit to number of results
 986          * @param int $start Optional: Timestamp, start from
 987          * @param int $end Optional: Timestamp, end at
 988          * @param bool $inc
 989          * @return OldLocalFile[]
 990          */
 991         function getHistory( $limit = null, $start = null, $end = null, $inc = true ) {
 992                 $dbr = $this->repo->getSlaveDB();
 993                 $tables = array( 'oldimage' );
 994                 $fields = OldLocalFile::selectFields();
 995                 $conds = $opts = $join_conds = array();
 996                 $eq = $inc ? '=' : '';
 997                 $conds[] = "oi_name = " . $dbr->addQuotes( $this->title->getDBkey() );
 998
 999                 if ( $start ) {
1000                         $conds[] = "oi_timestamp <$eq " . $dbr->addQuotes( $dbr->timestamp( $start ) );
1001                 }
1002
1003                 if ( $end ) {
1004                         $conds[] = "oi_timestamp >$eq " . $dbr->addQuotes( $dbr->timestamp( $end ) );
1005                 }
1006
1007                 if ( $limit ) {
1008                         $opts['LIMIT'] = $limit;
1009                 }
1010
1011                 // Search backwards for time > x queries
1012                 $order = ( !$start && $end !== null ) ? 'ASC' : 'DESC';
1013                 $opts['ORDER BY'] = "oi_timestamp $order";
1014                 $opts['USE INDEX'] = array( 'oldimage' => 'oi_name_timestamp' );
1015
1016                 Hooks::run( 'LocalFile::getHistory', array( &$this, &$tables, &$fields,
1017                         &$conds, &$opts, &$join_conds ) );
1018
1019                 $res = $dbr->select( $tables, $fields, $conds, __METHOD__, $opts, $join_conds );
1020                 $r = array();
1021
1022                 foreach ( $res as $row ) {
1023                         $r[] = $this->repo->newFileFromRow( $row );
1024                 }
1025
1026                 if ( $order == 'ASC' ) {
1027                         $r = array_reverse( $r ); // make sure it ends up descending
1028                 }
1029
1030                 return $r;
1031         }
1032
1033         /**
1034          * Returns the history of this file, line by line.
1035          * starts with current version, then old versions.
1036          * uses $this->historyLine to check which line to return:
1037          *  0      return line for current version
1038          *  1      query for old versions, return first one
1039          *  2, ... return next old version from above query
1040          * @return bool
1041          */
1042         public function nextHistoryLine() {
1043                 # Polymorphic function name to distinguish foreign and local fetches
1044                 $fname = get_class( $this ) . '::' . __FUNCTION__;
1045
1046                 $dbr = $this->repo->getSlaveDB();
1047
1048                 if ( $this->historyLine == 0 ) { // called for the first time, return line from cur
1049                         $this->historyRes = $dbr->select( 'image',
1050                                 array(
1051                                         '*',
1052                                         "'' AS oi_archive_name",
1053                                         '0 as oi_deleted',
1054                                         'img_sha1'
1055                                 ),
1056                                 array( 'img_name' => $this->title->getDBkey() ),
1057                                 $fname
1058                         );
1059
1060                         if ( 0 == $dbr->numRows( $this->historyRes ) ) {
1061                                 $this->historyRes = null;
1062
1063                                 return false;
1064                         }
1065                 } elseif ( $this->historyLine == 1 ) {
1066                         $this->historyRes = $dbr->select( 'oldimage', '*',
1067                                 array( 'oi_name' => $this->title->getDBkey() ),
1068                                 $fname,
1069                                 array( 'ORDER BY' => 'oi_timestamp DESC' )
1070                         );
1071                 }
1072                 $this->historyLine++;
1073
1074                 return $dbr->fetchObject( $this->historyRes );
1075         }
1076
1077         /**
1078          * Reset the history pointer to the first element of the history
1079          */
1080         public function resetHistory() {
1081                 $this->historyLine = 0;
1082
1083                 if ( !is_null( $this->historyRes ) ) {
1084                         $this->historyRes = null;
1085                 }
1086         }
1087
1088         /** getHashPath inherited */
1089         /** getRel inherited */
1090         /** getUrlRel inherited */
1091         /** getArchiveRel inherited */
1092         /** getArchivePath inherited */
1093         /** getThumbPath inherited */
1094         /** getArchiveUrl inherited */
1095         /** getThumbUrl inherited */
1096         /** getArchiveVirtualUrl inherited */
1097         /** getThumbVirtualUrl inherited */
1098         /** isHashed inherited */
1099
1100         /**
1101          * Upload a file and record it in the DB
1102          * @param string $srcPath Source storage path, virtual URL, or filesystem path
1103          * @param string $comment Upload description
1104          * @param string $pageText Text to use for the new description page,
1105          *   if a new description page is created
1106          * @param int|bool $flags Flags for publish()
1107          * @param array|bool $props File properties, if known. This can be used to
1108          *   reduce the upload time when uploading virtual URLs for which the file
1109          *   info is already known
1110          * @param string|bool $timestamp Timestamp for img_timestamp, or false to use the
1111          *   current time
1112          * @param User|null $user User object or null to use $wgUser
1113          *
1114          * @return FileRepoStatus On success, the value member contains the
1115          *     archive name, or an empty string if it was a new file.
1116          */
1117         function upload( $srcPath, $comment, $pageText, $flags = 0, $props = false,
1118                 $timestamp = false, $user = null
1119         ) {
1120                 global $wgContLang;
1121
1122                 if ( $this->getRepo()->getReadOnlyReason() !== false ) {
1123                         return $this->readOnlyFatalStatus();
1124                 }
1125
1126                 if ( !$props ) {
1127                         if ( $this->repo->isVirtualUrl( $srcPath )
1128                                 || FileBackend::isStoragePath( $srcPath )
1129                         ) {
1130                                 $props = $this->repo->getFileProps( $srcPath );
1131                         } else {
1132                                 $props = FSFile::getPropsFromPath( $srcPath );
1133                         }
1134                 }
1135
1136                 $options = array();
1137                 $handler = MediaHandler::getHandler( $props['mime'] );
1138                 if ( $handler ) {
1139                         $options['headers'] = $handler->getStreamHeaders( $props['metadata'] );
1140                 } else {
1141                         $options['headers'] = array();
1142                 }
1143
1144                 // Trim spaces on user supplied text
1145                 $comment = trim( $comment );
1146
1147                 // Truncate nicely or the DB will do it for us
1148                 // non-nicely (dangling multi-byte chars, non-truncated version in cache).
1149                 $comment = $wgContLang->truncate( $comment, 255 );
1150                 $this->lock(); // begin
1151                 $status = $this->publish( $srcPath, $flags, $options );
1152
1153                 if ( $status->successCount >= 2 ) {
1154                         // There will be a copy+(one of move,copy,store).
1155                         // The first succeeding does not commit us to updating the DB
1156                         // since it simply copied the current version to a timestamped file name.
1157                         // It is only *preferable* to avoid leaving such files orphaned.
1158                         // Once the second operation goes through, then the current version was
1159                         // updated and we must therefore update the DB too.
1160                         if ( !$this->recordUpload2( $status->value, $comment, $pageText, $props, $timestamp, $user ) ) {
1161                                 $status->fatal( 'filenotfound', $srcPath );
1162                         }
1163                 }
1164
1165                 $this->unlock(); // done
1166
1167                 return $status;
1168         }
1169
1170         /**
1171          * Record a file upload in the upload log and the image table
1172          * @param string $oldver
1173          * @param string $desc
1174          * @param string $license
1175          * @param string $copyStatus
1176          * @param string $source
1177          * @param bool $watch
1178          * @param string|bool $timestamp
1179          * @param User|null $user User object or null to use $wgUser
1180          * @return bool
1181          */
1182         function recordUpload( $oldver, $desc, $license = '', $copyStatus = '', $source = '',
1183                 $watch = false, $timestamp = false, User $user = null ) {
1184                 if ( !$user ) {
1185                         global $wgUser;
1186                         $user = $wgUser;
1187                 }
1188
1189                 $pageText = SpecialUpload::getInitialPageText( $desc, $license, $copyStatus, $source );
1190
1191                 if ( !$this->recordUpload2( $oldver, $desc, $pageText, false, $timestamp, $user ) ) {
1192                         return false;
1193                 }
1194
1195                 if ( $watch ) {
1196                         $user->addWatch( $this->getTitle() );
1197                 }
1198
1199                 return true;
1200         }
1201
1202         /**
1203          * Record a file upload in the upload log and the image table
1204          * @param string $oldver
1205          * @param string $comment
1206          * @param string $pageText
1207          * @param bool|array $props
1208          * @param string|bool $timestamp
1209          * @param null|User $user
1210          * @return bool
1211          */
1212         function recordUpload2(
1213                 $oldver, $comment, $pageText, $props = false, $timestamp = false, $user = null
1214         ) {
1215                 if ( is_null( $user ) ) {
1216                         global $wgUser;
1217                         $user = $wgUser;
1218                 }
1219
1220                 $dbw = $this->repo->getMasterDB();
1221
1222                 # Imports or such might force a certain timestamp; otherwise we generate
1223                 # it and can fudge it slightly to keep (name,timestamp) unique on re-upload.
1224                 if ( $timestamp === false ) {
1225                         $timestamp = $dbw->timestamp();
1226                         $allowTimeKludge = true;
1227                 } else {
1228                         $allowTimeKludge = false;
1229                 }
1230
1231                 $props = $props ?: $this->repo->getFileProps( $this->getVirtualUrl() );
1232                 $props['description'] = $comment;
1233                 $props['user'] = $user->getId();
1234                 $props['user_text'] = $user->getName();
1235                 $props['timestamp'] = wfTimestamp( TS_MW, $timestamp ); // DB -> TS_MW
1236                 $this->setProps( $props );
1237
1238                 # Fail now if the file isn't there
1239                 if ( !$this->fileExists ) {
1240                         wfDebug( __METHOD__ . ": File " . $this->getRel() . " went missing!\n" );
1241
1242                         return false;
1243                 }
1244
1245                 $dbw->startAtomic( __METHOD__ );
1246
1247                 # Test to see if the row exists using INSERT IGNORE
1248                 # This avoids race conditions by locking the row until the commit, and also
1249                 # doesn't deadlock. SELECT FOR UPDATE causes a deadlock for every race condition.
1250                 $dbw->insert( 'image',
1251                         array(
1252                                 'img_name' => $this->getName(),
1253                                 'img_size' => $this->size,
1254                                 'img_width' => intval( $this->width ),
1255                                 'img_height' => intval( $this->height ),
1256                                 'img_bits' => $this->bits,
1257                                 'img_media_type' => $this->media_type,
1258                                 'img_major_mime' => $this->major_mime,
1259                                 'img_minor_mime' => $this->minor_mime,
1260                                 'img_timestamp' => $timestamp,
1261                                 'img_description' => $comment,
1262                                 'img_user' => $user->getId(),
1263                                 'img_user_text' => $user->getName(),
1264                                 'img_metadata' => $dbw->encodeBlob( $this->metadata ),
1265                                 'img_sha1' => $this->sha1
1266                         ),
1267                         __METHOD__,
1268                         'IGNORE'
1269                 );
1270
1271                 $reupload = ( $dbw->affectedRows() == 0 );
1272                 if ( $reupload ) {
1273                         if ( $allowTimeKludge ) {
1274                                 # Use LOCK IN SHARE MODE to ignore any transaction snapshotting
1275                                 $ltimestamp = $dbw->selectField(
1276                                         'image',
1277                                         'img_timestamp',
1278                                         array( 'img_name' => $this->getName() ),
1279                                         __METHOD__,
1280                                         array( 'LOCK IN SHARE MODE' )
1281                                 );
1282                                 $lUnixtime = $ltimestamp ? wfTimestamp( TS_UNIX, $ltimestamp ) : false;
1283                                 # Avoid a timestamp that is not newer than the last version
1284                                 # TODO: the image/oldimage tables should be like page/revision with an ID field
1285                                 if ( $lUnixtime && wfTimestamp( TS_UNIX, $timestamp ) <= $lUnixtime ) {
1286                                         sleep( 1 ); // fast enough re-uploads would go far in the future otherwise
1287                                         $timestamp = $dbw->timestamp( $lUnixtime + 1 );
1288                                         $this->timestamp = wfTimestamp( TS_MW, $timestamp ); // DB -> TS_MW
1289                                 }
1290                         }
1291
1292                         # (bug 34993) Note: $oldver can be empty here, if the previous
1293                         # version of the file was broken. Allow registration of the new
1294                         # version to continue anyway, because that's better than having
1295                         # an image that's not fixable by user operations.
1296                         # Collision, this is an update of a file
1297                         # Insert previous contents into oldimage
1298                         $dbw->insertSelect( 'oldimage', 'image',
1299                                 array(
1300                                         'oi_name' => 'img_name',
1301                                         'oi_archive_name' => $dbw->addQuotes( $oldver ),
1302                                         'oi_size' => 'img_size',
1303                                         'oi_width' => 'img_width',
1304                                         'oi_height' => 'img_height',
1305                                         'oi_bits' => 'img_bits',
1306                                         'oi_timestamp' => 'img_timestamp',
1307                                         'oi_description' => 'img_description',
1308                                         'oi_user' => 'img_user',
1309                                         'oi_user_text' => 'img_user_text',
1310                                         'oi_metadata' => 'img_metadata',
1311                                         'oi_media_type' => 'img_media_type',
1312                                         'oi_major_mime' => 'img_major_mime',
1313                                         'oi_minor_mime' => 'img_minor_mime',
1314                                         'oi_sha1' => 'img_sha1'
1315                                 ),
1316                                 array( 'img_name' => $this->getName() ),
1317                                 __METHOD__
1318                         );
1319
1320                         # Update the current image row
1321                         $dbw->update( 'image',
1322                                 array(
1323                                         'img_size' => $this->size,
1324                                         'img_width' => intval( $this->width ),
1325                                         'img_height' => intval( $this->height ),
1326                                         'img_bits' => $this->bits,
1327                                         'img_media_type' => $this->media_type,
1328                                         'img_major_mime' => $this->major_mime,
1329                                         'img_minor_mime' => $this->minor_mime,
1330                                         'img_timestamp' => $timestamp,
1331                                         'img_description' => $comment,
1332                                         'img_user' => $user->getId(),
1333                                         'img_user_text' => $user->getName(),
1334                                         'img_metadata' => $dbw->encodeBlob( $this->metadata ),
1335                                         'img_sha1' => $this->sha1
1336                                 ),
1337                                 array( 'img_name' => $this->getName() ),
1338                                 __METHOD__
1339                         );
1340                 }
1341
1342                 $descTitle = $this->getTitle();
1343                 $wikiPage = new WikiFilePage( $descTitle );
1344                 $wikiPage->setFile( $this );
1345
1346                 // Add the log entry...
1347                 $logEntry = new ManualLogEntry( 'upload', $reupload ? 'overwrite' : 'upload' );
1348                 $logEntry->setPerformer( $user );
1349                 $logEntry->setComment( $comment );
1350                 $logEntry->setTarget( $descTitle );
1351                 // Allow people using the api to associate log entries with the upload.
1352                 // Log has a timestamp, but sometimes different from upload timestamp.
1353                 $logEntry->setParameters(
1354                         array(
1355                                 'img_sha1' => $this->sha1,
1356                                 'img_timestamp' => $timestamp,
1357                         )
1358                 );
1359                 // Note we keep $logId around since during new image
1360                 // creation, page doesn't exist yet, so log_page = 0
1361                 // but we want it to point to the page we're making,
1362                 // so we later modify the log entry.
1363                 // For a similar reason, we avoid making an RC entry
1364                 // now and wait until the page exists.
1365                 $logId = $logEntry->insert();
1366
1367                 if ( $descTitle->exists() ) {
1368                         // Page exists, do RC entry now (otherwise we wait for later)
1369                         $logEntry->publish( $logId );
1370                         // Use own context to get the action text in content language
1371                         $formatter = LogFormatter::newFromEntry( $logEntry );
1372                         $formatter->setContext( RequestContext::newExtraneousContext( $descTitle ) );
1373                         $editSummary = $formatter->getPlainActionText();
1374
1375                         $nullRevision = Revision::newNullRevision(
1376                                 $dbw,
1377                                 $descTitle->getArticleID(),
1378                                 $editSummary,
1379                                 false,
1380                                 $user
1381                         );
1382                         if ( $nullRevision ) {
1383                                 $nullRevision->insertOn( $dbw );
1384                                 Hooks::run(
1385                                         'NewRevisionFromEditComplete',
1386                                         array( $wikiPage, $nullRevision, $nullRevision->getParentId(), $user )
1387                                 );
1388                                 $wikiPage->updateRevisionOn( $dbw, $nullRevision );
1389                         }
1390
1391                         $newPageContent = null;
1392                 } else {
1393                         // Make the description page and RC log entry post-commit
1394                         $newPageContent = ContentHandler::makeContent( $pageText, $descTitle );
1395                 }
1396
1397                 # Defer purges, page creation, and link updates in case they error out.
1398                 # The most important thing is that files and the DB registry stay synced.
1399                 $dbw->endAtomic( __METHOD__ );
1400
1401                 # Do some cache purges after final commit so that:
1402                 # a) Changes are more likely to be seen post-purge
1403                 # b) They won't cause rollback of the log publish/update above
1404                 $that = $this;
1405                 $dbw->onTransactionIdle( function () use (
1406                         $that, $reupload, $wikiPage, $newPageContent, $comment, $user, $logEntry, $logId
1407                 ) {
1408                         # Update memcache after the commit
1409                         $that->invalidateCache();
1410
1411                         if ( $newPageContent ) {
1412                                 # New file page; create the description page.
1413                                 # There's already a log entry, so don't make a second RC entry
1414                                 # Squid and file cache for the description page are purged by doEditContent.
1415                                 $status = $wikiPage->doEditContent(
1416                                         $newPageContent,
1417                                         $comment,
1418                                         EDIT_NEW | EDIT_SUPPRESS_RC,
1419                                         false,
1420                                         $user
1421                                 );
1422
1423                                 // Now that the page exists, make an RC entry.
1424                                 // This relies on the resetArticleID() call in WikiPage::insertOn(),
1425                                 // which is triggered on $descTitle by doEditContent() above.
1426                                 $logEntry->publish( $logId );
1427                                 if ( isset( $status->value['revision'] ) ) {
1428                                         /** @var $rev Revision */
1429                                         $rev = $status->value['revision'];
1430                                         $that->getRepo()->getMasterDB()->update(
1431                                                 'logging',
1432                                                 array( 'log_page' => $rev->getPage() ),
1433                                                 array( 'log_id' => $logId ),
1434                                                 __METHOD__
1435                                         );
1436                                 }
1437                         } else {
1438                                 # Existing file page: invalidate description page cache
1439                                 $wikiPage->getTitle()->invalidateCache();
1440                                 $wikiPage->getTitle()->purgeSquid();
1441                         }
1442
1443                         # Run hook for other updates (typically more cache purging)
1444                         Hooks::run( 'FileUpload', array( $that, $reupload, !$newPageContent ) );
1445
1446                         if ( $reupload ) {
1447                                 # Delete old thumbnails
1448                                 $that->purgeThumbnails();
1449                                 # Remove the old file from the squid cache
1450                                 SquidUpdate::purge( array( $that->getURL() ) );
1451                         } else {
1452                                 # Update backlink pages pointing to this title if created
1453                                 LinksUpdate::queueRecursiveJobsForTable( $that->getTitle(), 'imagelinks' );
1454                         }
1455                 } );
1456
1457                 if ( !$reupload ) {
1458                         # This is a new file, so update the image count
1459                         DeferredUpdates::addUpdate( SiteStatsUpdate::factory( array( 'images' => 1 ) ) );
1460                 }
1461
1462                 # Invalidate cache for all pages using this file
1463                 DeferredUpdates::addUpdate( new HTMLCacheUpdate( $this->getTitle(), 'imagelinks' ) );
1464
1465                 return true;
1466         }
1467
1468         /**
1469          * Move or copy a file to its public location. If a file exists at the
1470          * destination, move it to an archive. Returns a FileRepoStatus object with
1471          * the archive name in the "value" member on success.
1472          *
1473          * The archive name should be passed through to recordUpload for database
1474          * registration.
1475          *
1476          * @param string $srcPath Local filesystem path or virtual URL to the source image
1477          * @param int $flags A bitwise combination of:
1478          *     File::DELETE_SOURCE    Delete the source file, i.e. move rather than copy
1479          * @param array $options Optional additional parameters
1480          * @return FileRepoStatus On success, the value member contains the
1481          *     archive name, or an empty string if it was a new file.
1482          */
1483         function publish( $srcPath, $flags = 0, array $options = array() ) {
1484                 return $this->publishTo( $srcPath, $this->getRel(), $flags, $options );
1485         }
1486
1487         /**
1488          * Move or copy a file to a specified location. Returns a FileRepoStatus
1489          * object with the archive name in the "value" member on success.
1490          *
1491          * The archive name should be passed through to recordUpload for database
1492          * registration.
1493          *
1494          * @param string $srcPath Local filesystem path or virtual URL to the source image
1495          * @param string $dstRel Target relative path
1496          * @param int $flags A bitwise combination of:
1497          *     File::DELETE_SOURCE    Delete the source file, i.e. move rather than copy
1498          * @param array $options Optional additional parameters
1499          * @return FileRepoStatus On success, the value member contains the
1500          *     archive name, or an empty string if it was a new file.
1501          */
1502         function publishTo( $srcPath, $dstRel, $flags = 0, array $options = array() ) {
1503                 $repo = $this->getRepo();
1504                 if ( $repo->getReadOnlyReason() !== false ) {
1505                         return $this->readOnlyFatalStatus();
1506                 }
1507
1508                 $this->lock(); // begin
1509
1510                 $archiveName = wfTimestamp( TS_MW ) . '!' . $this->getName();
1511                 $archiveRel = 'archive/' . $this->getHashPath() . $archiveName;
1512
1513                 if ( $repo->hasSha1Storage() ) {
1514                         $sha1 = $repo->isVirtualUrl( $srcPath )
1515                                 ? $repo->getFileSha1( $srcPath )
1516                                 : File::sha1Base36( $srcPath );
1517                         $dst = $repo->getBackend()->getPathForSHA1( $sha1 );
1518                         $status = $repo->quickImport( $srcPath, $dst );
1519                         if ( $flags & File::DELETE_SOURCE ) {
1520                                 unlink( $srcPath );
1521                         }
1522
1523                         if ( $this->exists() ) {
1524                                 $status->value = $archiveName;
1525                         }
1526                 } else {
1527                         $flags = $flags & File::DELETE_SOURCE ? LocalRepo::DELETE_SOURCE : 0;
1528                         $status = $repo->publish( $srcPath, $dstRel, $archiveRel, $flags, $options );
1529
1530                         if ( $status->value == 'new' ) {
1531                                 $status->value = '';
1532                         } else {
1533                                 $status->value = $archiveName;
1534                         }
1535                 }
1536
1537                 $this->unlock(); // done
1538
1539                 return $status;
1540         }
1541
1542         /** getLinksTo inherited */
1543         /** getExifData inherited */
1544         /** isLocal inherited */
1545         /** wasDeleted inherited */
1546
1547         /**
1548          * Move file to the new title
1549          *
1550          * Move current, old version and all thumbnails
1551          * to the new filename. Old file is deleted.
1552          *
1553          * Cache purging is done; checks for validity
1554          * and logging are caller's responsibility
1555          *
1556          * @param Title $target New file name
1557          * @return FileRepoStatus
1558          */
1559         function move( $target ) {
1560                 if ( $this->getRepo()->getReadOnlyReason() !== false ) {
1561                         return $this->readOnlyFatalStatus();
1562                 }
1563
1564                 wfDebugLog( 'imagemove', "Got request to move {$this->name} to " . $target->getText() );
1565                 $batch = new LocalFileMoveBatch( $this, $target );
1566
1567                 $this->lock(); // begin
1568                 $batch->addCurrent();
1569                 $archiveNames = $batch->addOlds();
1570                 $status = $batch->execute();
1571                 $this->unlock(); // done
1572
1573                 wfDebugLog( 'imagemove', "Finished moving {$this->name}" );
1574
1575                 // Purge the source and target files...
1576                 $oldTitleFile = wfLocalFile( $this->title );
1577                 $newTitleFile = wfLocalFile( $target );
1578                 // Hack: the lock()/unlock() pair is nested in a transaction so the locking is not
1579                 // tied to BEGIN/COMMIT. To avoid slow purges in the transaction, move them outside.
1580                 $this->getRepo()->getMasterDB()->onTransactionIdle(
1581                         function () use ( $oldTitleFile, $newTitleFile, $archiveNames ) {
1582                                 $oldTitleFile->purgeEverything();
1583                                 foreach ( $archiveNames as $archiveName ) {
1584                                         $oldTitleFile->purgeOldThumbnails( $archiveName );
1585                                 }
1586                                 $newTitleFile->purgeEverything();
1587                         }
1588                 );
1589
1590                 if ( $status->isOK() ) {
1591                         // Now switch the object
1592                         $this->title = $target;
1593                         // Force regeneration of the name and hashpath
1594                         unset( $this->name );
1595                         unset( $this->hashPath );
1596                 }
1597
1598                 return $status;
1599         }
1600
1601         /**
1602          * Delete all versions of the file.
1603          *
1604          * Moves the files into an archive directory (or deletes them)
1605          * and removes the database rows.
1606          *
1607          * Cache purging is done; logging is caller's responsibility.
1608          *
1609          * @param string $reason
1610          * @param bool $suppress
1611          * @param User|null $user
1612          * @return FileRepoStatus
1613          */
1614         function delete( $reason, $suppress = false, $user = null ) {
1615                 if ( $this->getRepo()->getReadOnlyReason() !== false ) {
1616                         return $this->readOnlyFatalStatus();
1617                 }
1618
1619                 $batch = new LocalFileDeleteBatch( $this, $reason, $suppress, $user );
1620
1621                 $this->lock(); // begin
1622                 $batch->addCurrent();
1623                 # Get old version relative paths
1624                 $archiveNames = $batch->addOlds();
1625                 $status = $batch->execute();
1626                 $this->unlock(); // done
1627
1628                 if ( $status->isOK() ) {
1629                         DeferredUpdates::addUpdate( SiteStatsUpdate::factory( array( 'images' => -1 ) ) );
1630                 }
1631
1632                 // Hack: the lock()/unlock() pair is nested in a transaction so the locking is not
1633                 // tied to BEGIN/COMMIT. To avoid slow purges in the transaction, move them outside.
1634                 $that = $this;
1635                 $this->getRepo()->getMasterDB()->onTransactionIdle(
1636                         function () use ( $that, $archiveNames ) {
1637                                 global $wgUseSquid;
1638
1639                                 $that->purgeEverything();
1640                                 foreach ( $archiveNames as $archiveName ) {
1641                                         $that->purgeOldThumbnails( $archiveName );
1642                                 }
1643
1644                                 if ( $wgUseSquid ) {
1645                                         // Purge the squid
1646                                         $purgeUrls = array();
1647                                         foreach ( $archiveNames as $archiveName ) {
1648                                                 $purgeUrls[] = $that->getArchiveUrl( $archiveName );
1649                                         }
1650                                         SquidUpdate::purge( $purgeUrls );
1651                                 }
1652                         }
1653                 );
1654
1655                 return $status;
1656         }
1657
1658         /**
1659          * Delete an old version of the file.
1660          *
1661          * Moves the file into an archive directory (or deletes it)
1662          * and removes the database row.
1663          *
1664          * Cache purging is done; logging is caller's responsibility.
1665          *
1666          * @param string $archiveName
1667          * @param string $reason
1668          * @param bool $suppress
1669          * @param User|null $user
1670          * @throws MWException Exception on database or file store failure
1671          * @return FileRepoStatus
1672          */
1673         function deleteOld( $archiveName, $reason, $suppress = false, $user = null ) {
1674                 global $wgUseSquid;
1675                 if ( $this->getRepo()->getReadOnlyReason() !== false ) {
1676                         return $this->readOnlyFatalStatus();
1677                 }
1678
1679                 $batch = new LocalFileDeleteBatch( $this, $reason, $suppress, $user );
1680
1681                 $this->lock(); // begin
1682                 $batch->addOld( $archiveName );
1683                 $status = $batch->execute();
1684                 $this->unlock(); // done
1685
1686                 $this->purgeOldThumbnails( $archiveName );
1687                 if ( $status->isOK() ) {
1688                         $this->purgeDescription();
1689                 }
1690
1691                 if ( $wgUseSquid ) {
1692                         // Purge the squid
1693                         SquidUpdate::purge( array( $this->getArchiveUrl( $archiveName ) ) );
1694                 }
1695
1696                 return $status;
1697         }
1698
1699         /**
1700          * Restore all or specified deleted revisions to the given file.
1701          * Permissions and logging are left to the caller.
1702          *
1703          * May throw database exceptions on error.
1704          *
1705          * @param array $versions Set of record ids of deleted items to restore,
1706          *   or empty to restore all revisions.
1707          * @param bool $unsuppress
1708          * @return FileRepoStatus
1709          */
1710         function restore( $versions = array(), $unsuppress = false ) {
1711                 if ( $this->getRepo()->getReadOnlyReason() !== false ) {
1712                         return $this->readOnlyFatalStatus();
1713                 }
1714
1715                 $batch = new LocalFileRestoreBatch( $this, $unsuppress );
1716
1717                 $this->lock(); // begin
1718                 if ( !$versions ) {
1719                         $batch->addAll();
1720                 } else {
1721                         $batch->addIds( $versions );
1722                 }
1723                 $status = $batch->execute();
1724                 if ( $status->isGood() ) {
1725                         $cleanupStatus = $batch->cleanup();
1726                         $cleanupStatus->successCount = 0;
1727                         $cleanupStatus->failCount = 0;
1728                         $status->merge( $cleanupStatus );
1729                 }
1730                 $this->unlock(); // done
1731
1732                 return $status;
1733         }
1734
1735         /** isMultipage inherited */
1736         /** pageCount inherited */
1737         /** scaleHeight inherited */
1738         /** getImageSize inherited */
1739
1740         /**
1741          * Get the URL of the file description page.
1742          * @return string
1743          */
1744         function getDescriptionUrl() {
1745                 return $this->title->getLocalURL();
1746         }
1747
1748         /**
1749          * Get the HTML text of the description page
1750          * This is not used by ImagePage for local files, since (among other things)
1751          * it skips the parser cache.
1752          *
1753          * @param Language $lang What language to get description in (Optional)
1754          * @return bool|mixed
1755          */
1756         function getDescriptionText( $lang = null ) {
1757                 $revision = Revision::newFromTitle( $this->title, false, Revision::READ_NORMAL );
1758                 if ( !$revision ) {
1759                         return false;
1760                 }
1761                 $content = $revision->getContent();
1762                 if ( !$content ) {
1763                         return false;
1764                 }
1765                 $pout = $content->getParserOutput( $this->title, null, new ParserOptions( null, $lang ) );
1766
1767                 return $pout->getText();
1768         }
1769
1770         /**
1771          * @param int $audience
1772          * @param User $user
1773          * @return string
1774          */
1775         function getDescription( $audience = self::FOR_PUBLIC, User $user = null ) {
1776                 $this->load();
1777                 if ( $audience == self::FOR_PUBLIC && $this->isDeleted( self::DELETED_COMMENT ) ) {
1778                         return '';
1779                 } elseif ( $audience == self::FOR_THIS_USER
1780                         && !$this->userCan( self::DELETED_COMMENT, $user )
1781                 ) {
1782                         return '';
1783                 } else {
1784                         return $this->description;
1785                 }
1786         }
1787
1788         /**
1789          * @return bool|string
1790          */
1791         function getTimestamp() {
1792                 $this->load();
1793
1794                 return $this->timestamp;
1795         }
1796
1797         /**
1798          * @return bool|string
1799          */
1800         public function getDescriptionTouched() {
1801                 // The DB lookup might return false, e.g. if the file was just deleted, or the shared DB repo
1802                 // itself gets it from elsewhere. To avoid repeating the DB lookups in such a case, we
1803                 // need to differentiate between null (uninitialized) and false (failed to load).
1804                 if ( $this->descriptionTouched === null ) {
1805                         $cond = array(
1806                                 'page_namespace' => $this->title->getNamespace(),
1807                                 'page_title' => $this->title->getDBkey()
1808                         );
1809                         $touched = $this->repo->getSlaveDB()->selectField( 'page', 'page_touched', $cond, __METHOD__ );
1810                         $this->descriptionTouched = $touched ? wfTimestamp( TS_MW, $touched ) : false;
1811                 }
1812
1813                 return $this->descriptionTouched;
1814         }
1815
1816         /**
1817          * @return string
1818          */
1819         function getSha1() {
1820                 $this->load();
1821                 // Initialise now if necessary
1822                 if ( $this->sha1 == '' && $this->fileExists ) {
1823                         $this->lock(); // begin
1824
1825                         $this->sha1 = $this->repo->getFileSha1( $this->getPath() );
1826                         if ( !wfReadOnly() && strval( $this->sha1 ) != '' ) {
1827                                 $dbw = $this->repo->getMasterDB();
1828                                 $dbw->update( 'image',
1829                                         array( 'img_sha1' => $this->sha1 ),
1830                                         array( 'img_name' => $this->getName() ),
1831                                         __METHOD__ );
1832                                 $this->invalidateCache();
1833                         }
1834
1835                         $this->unlock(); // done
1836                 }
1837
1838                 return $this->sha1;
1839         }
1840
1841         /**
1842          * @return bool Whether to cache in RepoGroup (this avoids OOMs)
1843          */
1844         function isCacheable() {
1845                 $this->load();
1846
1847                 // If extra data (metadata) was not loaded then it must have been large
1848                 return $this->extraDataLoaded
1849                 && strlen( serialize( $this->metadata ) ) <= self::CACHE_FIELD_MAX_LEN;
1850         }
1851
1852         /**
1853          * Start a transaction and lock the image for update
1854          * Increments a reference counter if the lock is already held
1855          * @throws MWException Throws an error if the lock was not acquired
1856          * @return bool Whether the file lock owns/spawned the DB transaction
1857          */
1858         function lock() {
1859                 $dbw = $this->repo->getMasterDB();
1860
1861                 if ( !$this->locked ) {
1862                         if ( !$dbw->trxLevel() ) {
1863                                 $dbw->begin( __METHOD__ );
1864                                 $this->lockedOwnTrx = true;
1865                         }
1866                         $this->locked++;
1867                         // Bug 54736: use simple lock to handle when the file does not exist.
1868                         // SELECT FOR UPDATE prevents changes, not other SELECTs with FOR UPDATE.
1869                         // Also, that would cause contention on INSERT of similarly named rows.
1870                         $backend = $this->getRepo()->getBackend();
1871                         $lockPaths = array( $this->getPath() ); // represents all versions of the file
1872                         $status = $backend->lockFiles( $lockPaths, LockManager::LOCK_EX, 5 );
1873                         if ( !$status->isGood() ) {
1874                                 throw new MWException( "Could not acquire lock for '{$this->getName()}.'" );
1875                         }
1876                         $dbw->onTransactionIdle( function () use ( $backend, $lockPaths ) {
1877                                 $backend->unlockFiles( $lockPaths, LockManager::LOCK_EX ); // release on commit
1878                         } );
1879                 }
1880
1881                 return $this->lockedOwnTrx;
1882         }
1883
1884         /**
1885          * Decrement the lock reference count. If the reference count is reduced to zero, commits
1886          * the transaction and thereby releases the image lock.
1887          */
1888         function unlock() {
1889                 if ( $this->locked ) {
1890                         --$this->locked;
1891                         if ( !$this->locked && $this->lockedOwnTrx ) {
1892                                 $dbw = $this->repo->getMasterDB();
1893                                 $dbw->commit( __METHOD__ );
1894                                 $this->lockedOwnTrx = false;
1895                         }
1896                 }
1897         }
1898
1899         /**
1900          * Roll back the DB transaction and mark the image unlocked
1901          */
1902         function unlockAndRollback() {
1903                 $this->locked = false;
1904                 $dbw = $this->repo->getMasterDB();
1905                 $dbw->rollback( __METHOD__ );
1906                 $this->lockedOwnTrx = false;
1907         }
1908
1909         /**
1910          * @return Status
1911          */
1912         protected function readOnlyFatalStatus() {
1913                 return $this->getRepo()->newFatal( 'filereadonlyerror', $this->getName(),
1914                         $this->getRepo()->getName(), $this->getRepo()->getReadOnlyReason() );
1915         }
1916
1917         /**
1918          * Clean up any dangling locks
1919          */
1920         function __destruct() {
1921                 $this->unlock();
1922         }
1923 } // LocalFile class
1924
1925 # ------------------------------------------------------------------------------
1926
1927 /**
1928  * Helper class for file deletion
1929  * @ingroup FileAbstraction
1930  */
1931 class LocalFileDeleteBatch {
1932         /** @var LocalFile */
1933         private $file;
1934
1935         /** @var string */
1936         private $reason;
1937
1938         /** @var array */
1939         private $srcRels = array();
1940
1941         /** @var array */
1942         private $archiveUrls = array();
1943
1944         /** @var array Items to be processed in the deletion batch */
1945         private $deletionBatch;
1946
1947         /** @var bool Whether to suppress all suppressable fields when deleting */
1948         private $suppress;
1949
1950         /** @var FileRepoStatus */
1951         private $status;
1952
1953         /** @var User */
1954         private $user;
1955
1956         /**
1957          * @param File $file
1958          * @param string $reason
1959          * @param bool $suppress
1960          * @param User|null $user
1961          */
1962         function __construct( File $file, $reason = '', $suppress = false, $user = null ) {
1963                 $this->file = $file;
1964                 $this->reason = $reason;
1965                 $this->suppress = $suppress;
1966                 if ( $user ) {
1967                         $this->user = $user;
1968                 } else {
1969                         global $wgUser;
1970                         $this->user = $wgUser;
1971                 }
1972                 $this->status = $file->repo->newGood();
1973         }
1974
1975         public function addCurrent() {
1976                 $this->srcRels['.'] = $this->file->getRel();
1977         }
1978
1979         /**
1980          * @param string $oldName
1981          */
1982         public function addOld( $oldName ) {
1983                 $this->srcRels[$oldName] = $this->file->getArchiveRel( $oldName );
1984                 $this->archiveUrls[] = $this->file->getArchiveUrl( $oldName );
1985         }
1986
1987         /**
1988          * Add the old versions of the image to the batch
1989          * @return array List of archive names from old versions
1990          */
1991         public function addOlds() {
1992                 $archiveNames = array();
1993
1994                 $dbw = $this->file->repo->getMasterDB();
1995                 $result = $dbw->select( 'oldimage',
1996                         array( 'oi_archive_name' ),
1997                         array( 'oi_name' => $this->file->getName() ),
1998                         __METHOD__
1999                 );
2000
2001                 foreach ( $result as $row ) {
2002                         $this->addOld( $row->oi_archive_name );
2003                         $archiveNames[] = $row->oi_archive_name;
2004                 }
2005
2006                 return $archiveNames;
2007         }
2008
2009         /**
2010          * @return array
2011          */
2012         protected function getOldRels() {
2013                 if ( !isset( $this->srcRels['.'] ) ) {
2014                         $oldRels =& $this->srcRels;
2015                         $deleteCurrent = false;
2016                 } else {
2017                         $oldRels = $this->srcRels;
2018                         unset( $oldRels['.'] );
2019                         $deleteCurrent = true;
2020                 }
2021
2022                 return array( $oldRels, $deleteCurrent );
2023         }
2024
2025         /**
2026          * @return array
2027          */
2028         protected function getHashes() {
2029                 $hashes = array();
2030                 list( $oldRels, $deleteCurrent ) = $this->getOldRels();
2031
2032                 if ( $deleteCurrent ) {
2033                         $hashes['.'] = $this->file->getSha1();
2034                 }
2035
2036                 if ( count( $oldRels ) ) {
2037                         $dbw = $this->file->repo->getMasterDB();
2038                         $res = $dbw->select(
2039                                 'oldimage',
2040                                 array( 'oi_archive_name', 'oi_sha1' ),
2041                                 array( 'oi_archive_name' => array_keys( $oldRels ),
2042                                         'oi_name' => $this->file->getName() ), // performance
2043                                 __METHOD__
2044                         );
2045
2046                         foreach ( $res as $row ) {
2047                                 if ( rtrim( $row->oi_sha1, "\0" ) === '' ) {
2048                                         // Get the hash from the file
2049                                         $oldUrl = $this->file->getArchiveVirtualUrl( $row->oi_archive_name );
2050                                         $props = $this->file->repo->getFileProps( $oldUrl );
2051
2052                                         if ( $props['fileExists'] ) {
2053                                                 // Upgrade the oldimage row
2054                                                 $dbw->update( 'oldimage',
2055                                                         array( 'oi_sha1' => $props['sha1'] ),
2056                                                         array( 'oi_name' => $this->file->getName(), 'oi_archive_name' => $row->oi_archive_name ),
2057                                                         __METHOD__ );
2058                                                 $hashes[$row->oi_archive_name] = $props['sha1'];
2059                                         } else {
2060                                                 $hashes[$row->oi_archive_name] = false;
2061                                         }
2062                                 } else {
2063                                         $hashes[$row->oi_archive_name] = $row->oi_sha1;
2064                                 }
2065                         }
2066                 }
2067
2068                 $missing = array_diff_key( $this->srcRels, $hashes );
2069
2070                 foreach ( $missing as $name => $rel ) {
2071                         $this->status->error( 'filedelete-old-unregistered', $name );
2072                 }
2073
2074                 foreach ( $hashes as $name => $hash ) {
2075                         if ( !$hash ) {
2076                                 $this->status->error( 'filedelete-missing', $this->srcRels[$name] );
2077                                 unset( $hashes[$name] );
2078                         }
2079                 }
2080
2081                 return $hashes;
2082         }
2083
2084         protected function doDBInserts() {
2085                 $dbw = $this->file->repo->getMasterDB();
2086                 $encTimestamp = $dbw->addQuotes( $dbw->timestamp() );
2087                 $encUserId = $dbw->addQuotes( $this->user->getId() );
2088                 $encReason = $dbw->addQuotes( $this->reason );
2089                 $encGroup = $dbw->addQuotes( 'deleted' );
2090                 $ext = $this->file->getExtension();
2091                 $dotExt = $ext === '' ? '' : ".$ext";
2092                 $encExt = $dbw->addQuotes( $dotExt );
2093                 list( $oldRels, $deleteCurrent ) = $this->getOldRels();
2094
2095                 // Bitfields to further suppress the content
2096                 if ( $this->suppress ) {
2097                         $bitfield = 0;
2098                         // This should be 15...
2099                         $bitfield |= Revision::DELETED_TEXT;
2100                         $bitfield |= Revision::DELETED_COMMENT;
2101                         $bitfield |= Revision::DELETED_USER;
2102                         $bitfield |= Revision::DELETED_RESTRICTED;
2103                 } else {
2104                         $bitfield = 'oi_deleted';
2105                 }
2106
2107                 if ( $deleteCurrent ) {
2108                         $concat = $dbw->buildConcat( array( "img_sha1", $encExt ) );
2109                         $where = array( 'img_name' => $this->file->getName() );
2110                         $dbw->insertSelect( 'filearchive', 'image',
2111                                 array(
2112                                         'fa_storage_group' => $encGroup,
2113                                         'fa_storage_key' => $dbw->conditional(
2114                                                 array( 'img_sha1' => '' ),
2115                                                 $dbw->addQuotes( '' ),
2116                                                 $concat
2117                                         ),
2118                                         'fa_deleted_user' => $encUserId,
2119                                         'fa_deleted_timestamp' => $encTimestamp,
2120                                         'fa_deleted_reason' => $encReason,
2121                                         'fa_deleted' => $this->suppress ? $bitfield : 0,
2122
2123                                         'fa_name' => 'img_name',
2124                                         'fa_archive_name' => 'NULL',
2125                                         'fa_size' => 'img_size',
2126                                         'fa_width' => 'img_width',
2127                                         'fa_height' => 'img_height',
2128                                         'fa_metadata' => 'img_metadata',
2129                                         'fa_bits' => 'img_bits',
2130                                         'fa_media_type' => 'img_media_type',
2131                                         'fa_major_mime' => 'img_major_mime',
2132                                         'fa_minor_mime' => 'img_minor_mime',
2133                                         'fa_description' => 'img_description',
2134                                         'fa_user' => 'img_user',
2135                                         'fa_user_text' => 'img_user_text',
2136                                         'fa_timestamp' => 'img_timestamp',
2137                                         'fa_sha1' => 'img_sha1',
2138                                 ), $where, __METHOD__ );
2139                 }
2140
2141                 if ( count( $oldRels ) ) {
2142                         $concat = $dbw->buildConcat( array( "oi_sha1", $encExt ) );
2143                         $where = array(
2144                                 'oi_name' => $this->file->getName(),
2145                                 'oi_archive_name' => array_keys( $oldRels ) );
2146                         $dbw->insertSelect( 'filearchive', 'oldimage',
2147                                 array(
2148                                         'fa_storage_group' => $encGroup,
2149                                         'fa_storage_key' => $dbw->conditional(
2150                                                 array( 'oi_sha1' => '' ),
2151                                                 $dbw->addQuotes( '' ),
2152                                                 $concat
2153                                         ),
2154                                         'fa_deleted_user' => $encUserId,
2155                                         'fa_deleted_timestamp' => $encTimestamp,
2156                                         'fa_deleted_reason' => $encReason,
2157                                         'fa_deleted' => $this->suppress ? $bitfield : 'oi_deleted',
2158
2159                                         'fa_name' => 'oi_name',
2160                                         'fa_archive_name' => 'oi_archive_name',
2161                                         'fa_size' => 'oi_size',
2162                                         'fa_width' => 'oi_width',
2163                                         'fa_height' => 'oi_height',
2164                                         'fa_metadata' => 'oi_metadata',
2165                                         'fa_bits' => 'oi_bits',
2166                                         'fa_media_type' => 'oi_media_type',
2167                                         'fa_major_mime' => 'oi_major_mime',
2168                                         'fa_minor_mime' => 'oi_minor_mime',
2169                                         'fa_description' => 'oi_description',
2170                                         'fa_user' => 'oi_user',
2171                                         'fa_user_text' => 'oi_user_text',
2172                                         'fa_timestamp' => 'oi_timestamp',
2173                                         'fa_sha1' => 'oi_sha1',
2174                                 ), $where, __METHOD__ );
2175                 }
2176         }
2177
2178         function doDBDeletes() {
2179                 $dbw = $this->file->repo->getMasterDB();
2180                 list( $oldRels, $deleteCurrent ) = $this->getOldRels();
2181
2182                 if ( count( $oldRels ) ) {
2183                         $dbw->delete( 'oldimage',
2184                                 array(
2185                                         'oi_name' => $this->file->getName(),
2186                                         'oi_archive_name' => array_keys( $oldRels )
2187                                 ), __METHOD__ );
2188                 }
2189
2190                 if ( $deleteCurrent ) {
2191                         $dbw->delete( 'image', array( 'img_name' => $this->file->getName() ), __METHOD__ );
2192                 }
2193         }
2194
2195         /**
2196          * Run the transaction
2197          * @return FileRepoStatus
2198          */
2199         public function execute() {
2200                 $repo = $this->file->getRepo();
2201                 $this->file->lock();
2202
2203                 // Prepare deletion batch
2204                 $hashes = $this->getHashes();
2205                 $this->deletionBatch = array();
2206                 $ext = $this->file->getExtension();
2207                 $dotExt = $ext === '' ? '' : ".$ext";
2208
2209                 foreach ( $this->srcRels as $name => $srcRel ) {
2210                         // Skip files that have no hash (e.g. missing DB record, or sha1 field and file source)
2211                         if ( isset( $hashes[$name] ) ) {
2212                                 $hash = $hashes[$name];
2213                                 $key = $hash . $dotExt;
2214                                 $dstRel = $repo->getDeletedHashPath( $key ) . $key;
2215                                 $this->deletionBatch[$name] = array( $srcRel, $dstRel );
2216                         }
2217                 }
2218
2219                 // Lock the filearchive rows so that the files don't get deleted by a cleanup operation
2220                 // We acquire this lock by running the inserts now, before the file operations.
2221                 // This potentially has poor lock contention characteristics -- an alternative
2222                 // scheme would be to insert stub filearchive entries with no fa_name and commit
2223                 // them in a separate transaction, then run the file ops, then update the fa_name fields.
2224                 $this->doDBInserts();
2225
2226                 if ( !$repo->hasSha1Storage() ) {
2227                         // Removes non-existent file from the batch, so we don't get errors.
2228                         // This also handles files in the 'deleted' zone deleted via revision deletion.
2229                         $checkStatus = $this->removeNonexistentFiles( $this->deletionBatch );
2230                         if ( !$checkStatus->isGood() ) {
2231                                 $this->status->merge( $checkStatus );
2232                                 return $this->status;
2233                         }
2234                         $this->deletionBatch = $checkStatus->value;
2235
2236                         // Execute the file deletion batch
2237                         $status = $this->file->repo->deleteBatch( $this->deletionBatch );
2238
2239                         if ( !$status->isGood() ) {
2240                                 $this->status->merge( $status );
2241                         }
2242                 }
2243
2244                 if ( !$this->status->isOK() ) {
2245                         // Critical file deletion error
2246                         // Roll back inserts, release lock and abort
2247                         // TODO: delete the defunct filearchive rows if we are using a non-transactional DB
2248                         $this->file->unlockAndRollback();
2249
2250                         return $this->status;
2251                 }
2252
2253                 // Delete image/oldimage rows
2254                 $this->doDBDeletes();
2255
2256                 // Commit and return
2257                 $this->file->unlock();
2258
2259                 return $this->status;
2260         }
2261
2262         /**
2263          * Removes non-existent files from a deletion batch.
2264          * @param array $batch
2265          * @return Status
2266          */
2267         protected function removeNonexistentFiles( $batch ) {
2268                 $files = $newBatch = array();
2269
2270                 foreach ( $batch as $batchItem ) {
2271                         list( $src, ) = $batchItem;
2272                         $files[$src] = $this->file->repo->getVirtualUrl( 'public' ) . '/' . rawurlencode( $src );
2273                 }
2274
2275                 $result = $this->file->repo->fileExistsBatch( $files );
2276                 if ( in_array( null, $result, true ) ) {
2277                         return Status::newFatal( 'backend-fail-internal',
2278                                 $this->file->repo->getBackend()->getName() );
2279                 }
2280
2281                 foreach ( $batch as $batchItem ) {
2282                         if ( $result[$batchItem[0]] ) {
2283                                 $newBatch[] = $batchItem;
2284                         }
2285                 }
2286
2287                 return Status::newGood( $newBatch );
2288         }
2289 }
2290
2291 # ------------------------------------------------------------------------------
2292
2293 /**
2294  * Helper class for file undeletion
2295  * @ingroup FileAbstraction
2296  */
2297 class LocalFileRestoreBatch {
2298         /** @var LocalFile */
2299         private $file;
2300
2301         /** @var array List of file IDs to restore */
2302         private $cleanupBatch;
2303
2304         /** @var array List of file IDs to restore */
2305         private $ids;
2306
2307         /** @var bool Add all revisions of the file */
2308         private $all;
2309
2310         /** @var bool Whether to remove all settings for suppressed fields */
2311         private $unsuppress = false;
2312
2313         /**
2314          * @param File $file
2315          * @param bool $unsuppress
2316          */
2317         function __construct( File $file, $unsuppress = false ) {
2318                 $this->file = $file;
2319                 $this->cleanupBatch = $this->ids = array();
2320                 $this->ids = array();
2321                 $this->unsuppress = $unsuppress;
2322         }
2323
2324         /**
2325          * Add a file by ID
2326          * @param int $fa_id
2327          */
2328         public function addId( $fa_id ) {
2329                 $this->ids[] = $fa_id;
2330         }
2331
2332         /**
2333          * Add a whole lot of files by ID
2334          * @param int[] $ids
2335          */
2336         public function addIds( $ids ) {
2337                 $this->ids = array_merge( $this->ids, $ids );
2338         }
2339
2340         /**
2341          * Add all revisions of the file
2342          */
2343         public function addAll() {
2344                 $this->all = true;
2345         }
2346
2347         /**
2348          * Run the transaction, except the cleanup batch.
2349          * The cleanup batch should be run in a separate transaction, because it locks different
2350          * rows and there's no need to keep the image row locked while it's acquiring those locks
2351          * The caller may have its own transaction open.
2352          * So we save the batch and let the caller call cleanup()
2353          * @return FileRepoStatus
2354          */
2355         public function execute() {
2356                 global $wgLang;
2357
2358                 $repo = $this->file->getRepo();
2359                 if ( !$this->all && !$this->ids ) {
2360                         // Do nothing
2361                         return $repo->newGood();
2362                 }
2363
2364                 $lockOwnsTrx = $this->file->lock();
2365
2366                 $dbw = $this->file->repo->getMasterDB();
2367                 $status = $this->file->repo->newGood();
2368
2369                 $exists = (bool)$dbw->selectField( 'image', '1',
2370                         array( 'img_name' => $this->file->getName() ),
2371                         __METHOD__,
2372                         // The lock() should already prevents changes, but this still may need
2373                         // to bypass any transaction snapshot. However, if lock() started the
2374                         // trx (which it probably did) then snapshot is post-lock and up-to-date.
2375                         $lockOwnsTrx ? array() : array( 'LOCK IN SHARE MODE' )
2376                 );
2377
2378                 // Fetch all or selected archived revisions for the file,
2379                 // sorted from the most recent to the oldest.
2380                 $conditions = array( 'fa_name' => $this->file->getName() );
2381
2382                 if ( !$this->all ) {
2383                         $conditions['fa_id'] = $this->ids;
2384                 }
2385
2386                 $result = $dbw->select(
2387                         'filearchive',
2388                         ArchivedFile::selectFields(),
2389                         $conditions,
2390                         __METHOD__,
2391                         array( 'ORDER BY' => 'fa_timestamp DESC' )
2392                 );
2393
2394                 $idsPresent = array();
2395                 $storeBatch = array();
2396                 $insertBatch = array();
2397                 $insertCurrent = false;
2398                 $deleteIds = array();
2399                 $first = true;
2400                 $archiveNames = array();
2401
2402                 foreach ( $result as $row ) {
2403                         $idsPresent[] = $row->fa_id;
2404
2405                         if ( $row->fa_name != $this->file->getName() ) {
2406                                 $status->error( 'undelete-filename-mismatch', $wgLang->timeanddate( $row->fa_timestamp ) );
2407                                 $status->failCount++;
2408                                 continue;
2409                         }
2410
2411                         if ( $row->fa_storage_key == '' ) {
2412                                 // Revision was missing pre-deletion
2413                                 $status->error( 'undelete-bad-store-key', $wgLang->timeanddate( $row->fa_timestamp ) );
2414                                 $status->failCount++;
2415                                 continue;
2416                         }
2417
2418                         $deletedRel = $repo->getDeletedHashPath( $row->fa_storage_key ) .
2419                                 $row->fa_storage_key;
2420                         $deletedUrl = $repo->getVirtualUrl() . '/deleted/' . $deletedRel;
2421
2422                         if ( isset( $row->fa_sha1 ) ) {
2423                                 $sha1 = $row->fa_sha1;
2424                         } else {
2425                                 // old row, populate from key
2426                                 $sha1 = LocalRepo::getHashFromKey( $row->fa_storage_key );
2427                         }
2428
2429                         # Fix leading zero
2430                         if ( strlen( $sha1 ) == 32 && $sha1[0] == '0' ) {
2431                                 $sha1 = substr( $sha1, 1 );
2432                         }
2433
2434                         if ( is_null( $row->fa_major_mime ) || $row->fa_major_mime == 'unknown'
2435                                 || is_null( $row->fa_minor_mime ) || $row->fa_minor_mime == 'unknown'
2436                                 || is_null( $row->fa_media_type ) || $row->fa_media_type == 'UNKNOWN'
2437                                 || is_null( $row->fa_metadata )
2438                         ) {
2439                                 // Refresh our metadata
2440                                 // Required for a new current revision; nice for older ones too. :)
2441                                 $props = RepoGroup::singleton()->getFileProps( $deletedUrl );
2442                         } else {
2443                                 $props = array(
2444                                         'minor_mime' => $row->fa_minor_mime,
2445                                         'major_mime' => $row->fa_major_mime,
2446                                         'media_type' => $row->fa_media_type,
2447                                         'metadata' => $row->fa_metadata
2448                                 );
2449                         }
2450
2451                         if ( $first && !$exists ) {
2452                                 // This revision will be published as the new current version
2453                                 $destRel = $this->file->getRel();
2454                                 $insertCurrent = array(
2455                                         'img_name' => $row->fa_name,
2456                                         'img_size' => $row->fa_size,
2457                                         'img_width' => $row->fa_width,
2458                                         'img_height' => $row->fa_height,
2459                                         'img_metadata' => $props['metadata'],
2460                                         'img_bits' => $row->fa_bits,
2461                                         'img_media_type' => $props['media_type'],
2462                                         'img_major_mime' => $props['major_mime'],
2463                                         'img_minor_mime' => $props['minor_mime'],
2464                                         'img_description' => $row->fa_description,
2465                                         'img_user' => $row->fa_user,
2466                                         'img_user_text' => $row->fa_user_text,
2467                                         'img_timestamp' => $row->fa_timestamp,
2468                                         'img_sha1' => $sha1
2469                                 );
2470
2471                                 // The live (current) version cannot be hidden!
2472                                 if ( !$this->unsuppress && $row->fa_deleted ) {
2473                                         $storeBatch[] = array( $deletedUrl, 'public', $destRel );
2474                                         $this->cleanupBatch[] = $row->fa_storage_key;
2475                                 }
2476                         } else {
2477                                 $archiveName = $row->fa_archive_name;
2478
2479                                 if ( $archiveName == '' ) {
2480                                         // This was originally a current version; we
2481                                         // have to devise a new archive name for it.
2482                                         // Format is <timestamp of archiving>!<name>
2483                                         $timestamp = wfTimestamp( TS_UNIX, $row->fa_deleted_timestamp );
2484
2485                                         do {
2486                                                 $archiveName = wfTimestamp( TS_MW, $timestamp ) . '!' . $row->fa_name;
2487                                                 $timestamp++;
2488                                         } while ( isset( $archiveNames[$archiveName] ) );
2489                                 }
2490
2491                                 $archiveNames[$archiveName] = true;
2492                                 $destRel = $this->file->getArchiveRel( $archiveName );
2493                                 $insertBatch[] = array(
2494                                         'oi_name' => $row->fa_name,
2495                                         'oi_archive_name' => $archiveName,
2496                                         'oi_size' => $row->fa_size,
2497                                         'oi_width' => $row->fa_width,
2498                                         'oi_height' => $row->fa_height,
2499                                         'oi_bits' => $row->fa_bits,
2500                                         'oi_description' => $row->fa_description,
2501                                         'oi_user' => $row->fa_user,
2502                                         'oi_user_text' => $row->fa_user_text,
2503                                         'oi_timestamp' => $row->fa_timestamp,
2504                                         'oi_metadata' => $props['metadata'],
2505                                         'oi_media_type' => $props['media_type'],
2506                                         'oi_major_mime' => $props['major_mime'],
2507                                         'oi_minor_mime' => $props['minor_mime'],
2508                                         'oi_deleted' => $this->unsuppress ? 0 : $row->fa_deleted,
2509                                         'oi_sha1' => $sha1 );
2510                         }
2511
2512                         $deleteIds[] = $row->fa_id;
2513
2514                         if ( !$this->unsuppress && $row->fa_deleted & File::DELETED_FILE ) {
2515                                 // private files can stay where they are
2516                                 $status->successCount++;
2517                         } else {
2518                                 $storeBatch[] = array( $deletedUrl, 'public', $destRel );
2519                                 $this->cleanupBatch[] = $row->fa_storage_key;
2520                         }
2521
2522                         $first = false;
2523                 }
2524
2525                 unset( $result );
2526
2527                 // Add a warning to the status object for missing IDs
2528                 $missingIds = array_diff( $this->ids, $idsPresent );
2529
2530                 foreach ( $missingIds as $id ) {
2531                         $status->error( 'undelete-missing-filearchive', $id );
2532                 }
2533
2534                 if ( !$repo->hasSha1Storage() ) {
2535                         // Remove missing files from batch, so we don't get errors when undeleting them
2536                         $checkStatus = $this->removeNonexistentFiles( $storeBatch );
2537                         if ( !$checkStatus->isGood() ) {
2538                                 $status->merge( $checkStatus );
2539                                 return $status;
2540                         }
2541                         $storeBatch = $checkStatus->value;
2542
2543                         // Run the store batch
2544                         // Use the OVERWRITE_SAME flag to smooth over a common error
2545                         $storeStatus = $this->file->repo->storeBatch( $storeBatch, FileRepo::OVERWRITE_SAME );
2546                         $status->merge( $storeStatus );
2547
2548                         if ( !$status->isGood() ) {
2549                                 // Even if some files could be copied, fail entirely as that is the
2550                                 // easiest thing to do without data loss
2551                                 $this->cleanupFailedBatch( $storeStatus, $storeBatch );
2552                                 $status->ok = false;
2553                                 $this->file->unlock();
2554
2555                                 return $status;
2556                         }
2557                 }
2558
2559                 // Run the DB updates
2560                 // Because we have locked the image row, key conflicts should be rare.
2561                 // If they do occur, we can roll back the transaction at this time with
2562                 // no data loss, but leaving unregistered files scattered throughout the
2563                 // public zone.
2564                 // This is not ideal, which is why it's important to lock the image row.
2565                 if ( $insertCurrent ) {
2566                         $dbw->insert( 'image', $insertCurrent, __METHOD__ );
2567                 }
2568
2569                 if ( $insertBatch ) {
2570                         $dbw->insert( 'oldimage', $insertBatch, __METHOD__ );
2571                 }
2572
2573                 if ( $deleteIds ) {
2574                         $dbw->delete( 'filearchive',
2575                                 array( 'fa_id' => $deleteIds ),
2576                                 __METHOD__ );
2577                 }
2578
2579                 // If store batch is empty (all files are missing), deletion is to be considered successful
2580                 if ( $status->successCount > 0 || !$storeBatch || $repo->hasSha1Storage() ) {
2581                         if ( !$exists ) {
2582                                 wfDebug( __METHOD__ . " restored {$status->successCount} items, creating a new current\n" );
2583
2584                                 DeferredUpdates::addUpdate( SiteStatsUpdate::factory( array( 'images' => 1 ) ) );
2585
2586                                 $this->file->purgeEverything();
2587                         } else {
2588                                 wfDebug( __METHOD__ . " restored {$status->successCount} as archived versions\n" );
2589                                 $this->file->purgeDescription();
2590                         }
2591                 }
2592
2593                 $this->file->unlock();
2594
2595                 return $status;
2596         }
2597
2598         /**
2599          * Removes non-existent files from a store batch.
2600          * @param array $triplets
2601          * @return Status
2602          */
2603         protected function removeNonexistentFiles( $triplets ) {
2604                 $files = $filteredTriplets = array();
2605                 foreach ( $triplets as $file ) {
2606                         $files[$file[0]] = $file[0];
2607                 }
2608
2609                 $result = $this->file->repo->fileExistsBatch( $files );
2610                 if ( in_array( null, $result, true ) ) {
2611                         return Status::newFatal( 'backend-fail-internal',
2612                                 $this->file->repo->getBackend()->getName() );
2613                 }
2614
2615                 foreach ( $triplets as $file ) {
2616                         if ( $result[$file[0]] ) {
2617                                 $filteredTriplets[] = $file;
2618                         }
2619                 }
2620
2621                 return Status::newGood( $filteredTriplets );
2622         }
2623
2624         /**
2625          * Removes non-existent files from a cleanup batch.
2626          * @param array $batch
2627          * @return array
2628          */
2629         protected function removeNonexistentFromCleanup( $batch ) {
2630                 $files = $newBatch = array();
2631                 $repo = $this->file->repo;
2632
2633                 foreach ( $batch as $file ) {
2634                         $files[$file] = $repo->getVirtualUrl( 'deleted' ) . '/' .
2635                                 rawurlencode( $repo->getDeletedHashPath( $file ) . $file );
2636                 }
2637
2638                 $result = $repo->fileExistsBatch( $files );
2639
2640                 foreach ( $batch as $file ) {
2641                         if ( $result[$file] ) {
2642                                 $newBatch[] = $file;
2643                         }
2644                 }
2645
2646                 return $newBatch;
2647         }
2648
2649         /**
2650          * Delete unused files in the deleted zone.
2651          * This should be called from outside the transaction in which execute() was called.
2652          * @return FileRepoStatus
2653          */
2654         public function cleanup() {
2655                 if ( !$this->cleanupBatch ) {
2656                         return $this->file->repo->newGood();
2657                 }
2658
2659                 $this->cleanupBatch = $this->removeNonexistentFromCleanup( $this->cleanupBatch );
2660
2661                 $status = $this->file->repo->cleanupDeletedBatch( $this->cleanupBatch );
2662
2663                 return $status;
2664         }
2665
2666         /**
2667          * Cleanup a failed batch. The batch was only partially successful, so
2668          * rollback by removing all items that were succesfully copied.
2669          *
2670          * @param Status $storeStatus
2671          * @param array $storeBatch
2672          */
2673         protected function cleanupFailedBatch( $storeStatus, $storeBatch ) {
2674                 $cleanupBatch = array();
2675
2676                 foreach ( $storeStatus->success as $i => $success ) {
2677                         // Check if this item of the batch was successfully copied
2678                         if ( $success ) {
2679                                 // Item was successfully copied and needs to be removed again
2680                                 // Extract ($dstZone, $dstRel) from the batch
2681                                 $cleanupBatch[] = array( $storeBatch[$i][1], $storeBatch[$i][2] );
2682                         }
2683                 }
2684                 $this->file->repo->cleanupBatch( $cleanupBatch );
2685         }
2686 }
2687
2688 # ------------------------------------------------------------------------------
2689
2690 /**
2691  * Helper class for file movement
2692  * @ingroup FileAbstraction
2693  */
2694 class LocalFileMoveBatch {
2695         /** @var LocalFile */
2696         protected $file;
2697
2698         /** @var Title */
2699         protected $target;
2700
2701         protected $cur;
2702
2703         protected $olds;
2704
2705         protected $oldCount;
2706
2707         protected $archive;
2708
2709         /** @var DatabaseBase */
2710         protected $db;
2711
2712         /**
2713          * @param File $file
2714          * @param Title $target
2715          */
2716         function __construct( File $file, Title $target ) {
2717                 $this->file = $file;
2718                 $this->target = $target;
2719                 $this->oldHash = $this->file->repo->getHashPath( $this->file->getName() );
2720                 $this->newHash = $this->file->repo->getHashPath( $this->target->getDBkey() );
2721                 $this->oldName = $this->file->getName();
2722                 $this->newName = $this->file->repo->getNameFromTitle( $this->target );
2723                 $this->oldRel = $this->oldHash . $this->oldName;
2724                 $this->newRel = $this->newHash . $this->newName;
2725                 $this->db = $file->getRepo()->getMasterDb();
2726         }
2727
2728         /**
2729          * Add the current image to the batch
2730          */
2731         public function addCurrent() {
2732                 $this->cur = array( $this->oldRel, $this->newRel );
2733         }
2734
2735         /**
2736          * Add the old versions of the image to the batch
2737          * @return array List of archive names from old versions
2738          */
2739         public function addOlds() {
2740                 $archiveBase = 'archive';
2741                 $this->olds = array();
2742                 $this->oldCount = 0;
2743                 $archiveNames = array();
2744
2745                 $result = $this->db->select( 'oldimage',
2746                         array( 'oi_archive_name', 'oi_deleted' ),
2747                         array( 'oi_name' => $this->oldName ),
2748                         __METHOD__,
2749                         array( 'LOCK IN SHARE MODE' ) // ignore snapshot
2750                 );
2751
2752                 foreach ( $result as $row ) {
2753                         $archiveNames[] = $row->oi_archive_name;
2754                         $oldName = $row->oi_archive_name;
2755                         $bits = explode( '!', $oldName, 2 );
2756
2757                         if ( count( $bits ) != 2 ) {
2758                                 wfDebug( "Old file name missing !: '$oldName' \n" );
2759                                 continue;
2760                         }
2761
2762                         list( $timestamp, $filename ) = $bits;
2763
2764                         if ( $this->oldName != $filename ) {
2765                                 wfDebug( "Old file name doesn't match: '$oldName' \n" );
2766                                 continue;
2767                         }
2768
2769                         $this->oldCount++;
2770
2771                         // Do we want to add those to oldCount?
2772                         if ( $row->oi_deleted & File::DELETED_FILE ) {
2773                                 continue;
2774                         }
2775
2776                         $this->olds[] = array(
2777                                 "{$archiveBase}/{$this->oldHash}{$oldName}",
2778                                 "{$archiveBase}/{$this->newHash}{$timestamp}!{$this->newName}"
2779                         );
2780                 }
2781
2782                 return $archiveNames;
2783         }
2784
2785         /**
2786          * Perform the move.
2787          * @return FileRepoStatus
2788          */
2789         public function execute() {
2790                 $repo = $this->file->repo;
2791                 $status = $repo->newGood();
2792
2793                 $triplets = $this->getMoveTriplets();
2794                 $checkStatus = $this->removeNonexistentFiles( $triplets );
2795                 if ( !$checkStatus->isGood() ) {
2796                         $status->merge( $checkStatus );
2797                         return $status;
2798                 }
2799                 $triplets = $checkStatus->value;
2800                 $destFile = wfLocalFile( $this->target );
2801
2802                 $this->file->lock(); // begin
2803                 $destFile->lock(); // quickly fail if destination is not available
2804                 // Rename the file versions metadata in the DB.
2805                 // This implicitly locks the destination file, which avoids race conditions.
2806                 // If we moved the files from A -> C before DB updates, another process could
2807                 // move files from B -> C at this point, causing storeBatch() to fail and thus
2808                 // cleanupTarget() to trigger. It would delete the C files and cause data loss.
2809                 $statusDb = $this->doDBUpdates();
2810                 if ( !$statusDb->isGood() ) {
2811                         $destFile->unlock();
2812                         $this->file->unlockAndRollback();
2813                         $statusDb->ok = false;
2814
2815                         return $statusDb;
2816                 }
2817                 wfDebugLog( 'imagemove', "Renamed {$this->file->getName()} in database: " .
2818                         "{$statusDb->successCount} successes, {$statusDb->failCount} failures" );
2819
2820                 if ( !$repo->hasSha1Storage() ) {
2821                         // Copy the files into their new location.
2822                         // If a prior process fataled copying or cleaning up files we tolerate any
2823                         // of the existing files if they are identical to the ones being stored.
2824                         $statusMove = $repo->storeBatch( $triplets, FileRepo::OVERWRITE_SAME );
2825                         wfDebugLog( 'imagemove', "Moved files for {$this->file->getName()}: " .
2826                                 "{$statusMove->successCount} successes, {$statusMove->failCount} failures" );
2827                         if ( !$statusMove->isGood() ) {
2828                                 // Delete any files copied over (while the destination is still locked)
2829                                 $this->cleanupTarget( $triplets );
2830                                 $destFile->unlock();
2831                                 $this->file->unlockAndRollback(); // unlocks the destination
2832                                 wfDebugLog( 'imagemove', "Error in moving files: " . $statusMove->getWikiText() );
2833                                 $statusMove->ok = false;
2834
2835                                 return $statusMove;
2836                         }
2837                         $status->merge( $statusMove );
2838                 }
2839
2840                 $destFile->unlock();
2841                 $this->file->unlock(); // done
2842
2843                 // Everything went ok, remove the source files
2844                 $this->cleanupSource( $triplets );
2845
2846                 $status->merge( $statusDb );
2847
2848                 return $status;
2849         }
2850
2851         /**
2852          * Do the database updates and return a new FileRepoStatus indicating how
2853          * many rows where updated.
2854          *
2855          * @return FileRepoStatus
2856          */
2857         protected function doDBUpdates() {
2858                 $repo = $this->file->repo;
2859                 $status = $repo->newGood();
2860                 $dbw = $this->db;
2861
2862                 // Update current image
2863                 $dbw->update(
2864                         'image',
2865                         array( 'img_name' => $this->newName ),
2866                         array( 'img_name' => $this->oldName ),
2867                         __METHOD__
2868                 );
2869
2870                 if ( $dbw->affectedRows() ) {
2871                         $status->successCount++;
2872                 } else {
2873                         $status->failCount++;
2874                         $status->fatal( 'imageinvalidfilename' );
2875
2876                         return $status;
2877                 }
2878
2879                 // Update old images
2880                 $dbw->update(
2881                         'oldimage',
2882                         array(
2883                                 'oi_name' => $this->newName,
2884                                 'oi_archive_name = ' . $dbw->strreplace( 'oi_archive_name',
2885                                         $dbw->addQuotes( $this->oldName ), $dbw->addQuotes( $this->newName ) ),
2886                         ),
2887                         array( 'oi_name' => $this->oldName ),
2888                         __METHOD__
2889                 );
2890
2891                 $affected = $dbw->affectedRows();
2892                 $total = $this->oldCount;
2893                 $status->successCount += $affected;
2894                 // Bug 34934: $total is based on files that actually exist.
2895                 // There may be more DB rows than such files, in which case $affected
2896                 // can be greater than $total. We use max() to avoid negatives here.
2897                 $status->failCount += max( 0, $total - $affected );
2898                 if ( $status->failCount ) {
2899                         $status->error( 'imageinvalidfilename' );
2900                 }
2901
2902                 return $status;
2903         }
2904
2905         /**
2906          * Generate triplets for FileRepo::storeBatch().
2907          * @return array
2908          */
2909         protected function getMoveTriplets() {
2910                 $moves = array_merge( array( $this->cur ), $this->olds );
2911                 $triplets = array(); // The format is: (srcUrl, destZone, destUrl)
2912
2913                 foreach ( $moves as $move ) {
2914                         // $move: (oldRelativePath, newRelativePath)
2915                         $srcUrl = $this->file->repo->getVirtualUrl() . '/public/' . rawurlencode( $move[0] );
2916                         $triplets[] = array( $srcUrl, 'public', $move[1] );
2917                         wfDebugLog(
2918                                 'imagemove',
2919                                 "Generated move triplet for {$this->file->getName()}: {$srcUrl} :: public :: {$move[1]}"
2920                         );
2921                 }
2922
2923                 return $triplets;
2924         }
2925
2926         /**
2927          * Removes non-existent files from move batch.
2928          * @param array $triplets
2929          * @return Status
2930          */
2931         protected function removeNonexistentFiles( $triplets ) {
2932                 $files = array();
2933
2934                 foreach ( $triplets as $file ) {
2935                         $files[$file[0]] = $file[0];
2936                 }
2937
2938                 $result = $this->file->repo->fileExistsBatch( $files );
2939                 if ( in_array( null, $result, true ) ) {
2940                         return Status::newFatal( 'backend-fail-internal',
2941                                 $this->file->repo->getBackend()->getName() );
2942                 }
2943
2944                 $filteredTriplets = array();
2945                 foreach ( $triplets as $file ) {
2946                         if ( $result[$file[0]] ) {
2947                                 $filteredTriplets[] = $file;
2948                         } else {
2949                                 wfDebugLog( 'imagemove', "File {$file[0]} does not exist" );
2950                         }
2951                 }
2952
2953                 return Status::newGood( $filteredTriplets );
2954         }
2955
2956         /**
2957          * Cleanup a partially moved array of triplets by deleting the target
2958          * files. Called if something went wrong half way.
2959          * @param array $triplets
2960          */
2961         protected function cleanupTarget( $triplets ) {
2962                 // Create dest pairs from the triplets
2963                 $pairs = array();
2964                 foreach ( $triplets as $triplet ) {
2965                         // $triplet: (old source virtual URL, dst zone, dest rel)
2966                         $pairs[] = array( $triplet[1], $triplet[2] );
2967                 }
2968
2969                 $this->file->repo->cleanupBatch( $pairs );
2970         }
2971
2972         /**
2973          * Cleanup a fully moved array of triplets by deleting the source files.
2974          * Called at the end of the move process if everything else went ok.
2975          * @param array $triplets
2976          */
2977         protected function cleanupSource( $triplets ) {
2978                 // Create source file names from the triplets
2979                 $files = array();
2980                 foreach ( $triplets as $triplet ) {
2981                         $files[] = $triplet[0];
2982                 }
2983
2984                 $this->file->repo->cleanupBatch( $files );
2985         }
2986 }