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 bool Whether the row was upgraded on load */
 113         private $upgraded;
 114
 115         /** @var bool True if the image row is locked */
 116         private $locked;
 117
 118         /** @var bool True if the image row is locked with a lock initiated transaction */
 119         private $lockedOwnTrx;
 120
 121         /** @var bool True if file is not present in file system. Not to be cached in memcached */
 122         private $missing;
 123
 124         /** @var int UNIX timestamp of last markVolatile() call */
 125         private $lastMarkedVolatile = 0;
 126
 127         const LOAD_ALL = 1; // integer; load all the lazy fields too (like metadata)
 128         const LOAD_VIA_SLAVE = 2; // integer; use a slave to load the data
 129
 130         const VOLATILE_TTL = 300; // integer; seconds
 131
 132         /**
 133          * Create a LocalFile from a title
 134          * Do not call this except from inside a repo class.
 135          *
 136          * Note: $unused param is only here to avoid an E_STRICT
 137          *
 138          * @param Title $title
 139          * @param FileRepo $repo
 140          * @param null $unused
 141          *
 142          * @return LocalFile
 143          */
 144         static function newFromTitle( $title, $repo, $unused = null ) {
 145                 return new self( $title, $repo );
 146         }
 147
 148         /**
 149          * Create a LocalFile from a title
 150          * Do not call this except from inside a repo class.
 151          *
 152          * @param stdClass $row
 153          * @param FileRepo $repo
 154          *
 155          * @return LocalFile
 156          */
 157         static function newFromRow( $row, $repo ) {
 158                 $title = Title::makeTitle( NS_FILE, $row->img_name );
 159                 $file = new self( $title, $repo );
 160                 $file->loadFromRow( $row );
 161
 162                 return $file;
 163         }
 164
 165         /**
 166          * Create a LocalFile from a SHA-1 key
 167          * Do not call this except from inside a repo class.
 168          *
 169          * @param string $sha1 base-36 SHA-1
 170          * @param LocalRepo $repo
 171          * @param string|bool $timestamp MW_timestamp (optional)
 172          * @return bool|LocalFile
 173          */
 174         static function newFromKey( $sha1, $repo, $timestamp = false ) {
 175                 $dbr = $repo->getSlaveDB();
 176
 177                 $conds = array( 'img_sha1' => $sha1 );
 178                 if ( $timestamp ) {
 179                         $conds['img_timestamp'] = $dbr->timestamp( $timestamp );
 180                 }
 181
 182                 $row = $dbr->selectRow( 'image', self::selectFields(), $conds, __METHOD__ );
 183                 if ( $row ) {
 184                         return self::newFromRow( $row, $repo );
 185                 } else {
 186                         return false;
 187                 }
 188         }
 189
 190         /**
 191          * Fields in the image table
 192          * @return array
 193          */
 194         static function selectFields() {
 195                 return array(
 196                         'img_name',
 197                         'img_size',
 198                         'img_width',
 199                         'img_height',
 200                         'img_metadata',
 201                         'img_bits',
 202                         'img_media_type',
 203                         'img_major_mime',
 204                         'img_minor_mime',
 205                         'img_description',
 206                         'img_user',
 207                         'img_user_text',
 208                         'img_timestamp',
 209                         'img_sha1',
 210                 );
 211         }
 212
 213         /**
 214          * Constructor.
 215          * Do not call this except from inside a repo class.
 216          * @param Title $title
 217          * @param FileRepo $repo
 218          */
 219         function __construct( $title, $repo ) {
 220                 parent::__construct( $title, $repo );
 221
 222                 $this->metadata = '';
 223                 $this->historyLine = 0;
 224                 $this->historyRes = null;
 225                 $this->dataLoaded = false;
 226                 $this->extraDataLoaded = false;
 227
 228                 $this->assertRepoDefined();
 229                 $this->assertTitleDefined();
 230         }
 231
 232         /**
 233          * Get the memcached key for the main data for this file, or false if
 234          * there is no access to the shared cache.
 235          * @return string|bool
 236          */
 237         function getCacheKey() {
 238                 $hashedName = md5( $this->getName() );
 239
 240                 return $this->repo->getSharedCacheKey( 'file', $hashedName );
 241         }
 242
 243         /**
 244          * Try to load file metadata from memcached. Returns true on success.
 245          * @return bool
 246          */
 247         function loadFromCache() {
 248                 global $wgMemc;
 249
 250                 wfProfileIn( __METHOD__ );
 251                 $this->dataLoaded = false;
 252                 $this->extraDataLoaded = false;
 253                 $key = $this->getCacheKey();
 254
 255                 if ( !$key ) {
 256                         wfProfileOut( __METHOD__ );
 257
 258                         return false;
 259                 }
 260
 261                 $cachedValues = $wgMemc->get( $key );
 262
 263                 // Check if the key existed and belongs to this version of MediaWiki
 264                 if ( isset( $cachedValues['version'] ) && $cachedValues['version'] == MW_FILE_VERSION ) {
 265                         wfDebug( "Pulling file metadata from cache key $key\n" );
 266                         $this->fileExists = $cachedValues['fileExists'];
 267                         if ( $this->fileExists ) {
 268                                 $this->setProps( $cachedValues );
 269                         }
 270                         $this->dataLoaded = true;
 271                         $this->extraDataLoaded = true;
 272                         foreach ( $this->getLazyCacheFields( '' ) as $field ) {
 273                                 $this->extraDataLoaded = $this->extraDataLoaded && isset( $cachedValues[$field] );
 274                         }
 275                 }
 276
 277                 if ( $this->dataLoaded ) {
 278                         wfIncrStats( 'image_cache_hit' );
 279                 } else {
 280                         wfIncrStats( 'image_cache_miss' );
 281                 }
 282
 283                 wfProfileOut( __METHOD__ );
 284
 285                 return $this->dataLoaded;
 286         }
 287
 288         /**
 289          * Save the file metadata to memcached
 290          */
 291         function saveToCache() {
 292                 global $wgMemc;
 293
 294                 $this->load();
 295                 $key = $this->getCacheKey();
 296
 297                 if ( !$key ) {
 298                         return;
 299                 }
 300
 301                 $fields = $this->getCacheFields( '' );
 302                 $cache = array( 'version' => MW_FILE_VERSION );
 303                 $cache['fileExists'] = $this->fileExists;
 304
 305                 if ( $this->fileExists ) {
 306                         foreach ( $fields as $field ) {
 307                                 $cache[$field] = $this->$field;
 308                         }
 309                 }
 310
 311                 // Strip off excessive entries from the subset of fields that can become large.
 312                 // If the cache value gets to large it will not fit in memcached and nothing will
 313                 // get cached at all, causing master queries for any file access.
 314                 foreach ( $this->getLazyCacheFields( '' ) as $field ) {
 315                         if ( isset( $cache[$field] ) && strlen( $cache[$field] ) > 100 * 1024 ) {
 316                                 unset( $cache[$field] ); // don't let the value get too big
 317                         }
 318                 }
 319
 320                 // Cache presence for 1 week and negatives for 1 day
 321                 $wgMemc->set( $key, $cache, $this->fileExists ? 86400 * 7 : 86400 );
 322         }
 323
 324         /**
 325          * Load metadata from the file itself
 326          */
 327         function loadFromFile() {
 328                 $props = $this->repo->getFileProps( $this->getVirtualUrl() );
 329                 $this->setProps( $props );
 330         }
 331
 332         /**
 333          * @param string $prefix
 334          * @return array
 335          */
 336         function getCacheFields( $prefix = 'img_' ) {
 337                 static $fields = array( 'size', 'width', 'height', 'bits', 'media_type',
 338                         'major_mime', 'minor_mime', 'metadata', 'timestamp', 'sha1', 'user',
 339                         'user_text', 'description' );
 340                 static $results = array();
 341
 342                 if ( $prefix == '' ) {
 343                         return $fields;
 344                 }
 345
 346                 if ( !isset( $results[$prefix] ) ) {
 347                         $prefixedFields = array();
 348                         foreach ( $fields as $field ) {
 349                                 $prefixedFields[] = $prefix . $field;
 350                         }
 351                         $results[$prefix] = $prefixedFields;
 352                 }
 353
 354                 return $results[$prefix];
 355         }
 356
 357         /**
 358          * @param string $prefix
 359          * @return array
 360          */
 361         function getLazyCacheFields( $prefix = 'img_' ) {
 362                 static $fields = array( 'metadata' );
 363                 static $results = array();
 364
 365                 if ( $prefix == '' ) {
 366                         return $fields;
 367                 }
 368
 369                 if ( !isset( $results[$prefix] ) ) {
 370                         $prefixedFields = array();
 371                         foreach ( $fields as $field ) {
 372                                 $prefixedFields[] = $prefix . $field;
 373                         }
 374                         $results[$prefix] = $prefixedFields;
 375                 }
 376
 377                 return $results[$prefix];
 378         }
 379
 380         /**
 381          * Load file metadata from the DB
 382          */
 383         function loadFromDB( $flags = 0 ) {
 384                 # Polymorphic function name to distinguish foreign and local fetches
 385                 $fname = get_class( $this ) . '::' . __FUNCTION__;
 386                 wfProfileIn( $fname );
 387
 388                 # Unconditionally set loaded=true, we don't want the accessors constantly rechecking
 389                 $this->dataLoaded = true;
 390                 $this->extraDataLoaded = true;
 391
 392                 $dbr = ( $flags & self::LOAD_VIA_SLAVE )
 393                         ? $this->repo->getSlaveDB()
 394                         : $this->repo->getMasterDB();
 395
 396                 $row = $dbr->selectRow( 'image', $this->getCacheFields( 'img_' ),
 397                         array( 'img_name' => $this->getName() ), $fname );
 398
 399                 if ( $row ) {
 400                         $this->loadFromRow( $row );
 401                 } else {
 402                         $this->fileExists = false;
 403                 }
 404
 405                 wfProfileOut( $fname );
 406         }
 407
 408         /**
 409          * Load lazy file metadata from the DB.
 410          * This covers fields that are sometimes not cached.
 411          */
 412         protected function loadExtraFromDB() {
 413                 # Polymorphic function name to distinguish foreign and local fetches
 414                 $fname = get_class( $this ) . '::' . __FUNCTION__;
 415                 wfProfileIn( $fname );
 416
 417                 # Unconditionally set loaded=true, we don't want the accessors constantly rechecking
 418                 $this->extraDataLoaded = true;
 419
 420                 $fieldMap = $this->loadFieldsWithTimestamp( $this->repo->getSlaveDB(), $fname );
 421                 if ( !$fieldMap ) {
 422                         $fieldMap = $this->loadFieldsWithTimestamp( $this->repo->getMasterDB(), $fname );
 423                 }
 424
 425                 if ( $fieldMap ) {
 426                         foreach ( $fieldMap as $name => $value ) {
 427                                 $this->$name = $value;
 428                         }
 429                 } else {
 430                         wfProfileOut( $fname );
 431                         throw new MWException( "Could not find data for image '{$this->getName()}'." );
 432                 }
 433
 434                 wfProfileOut( $fname );
 435         }
 436
 437         /**
 438          * @param DatabaseBase $dbr
 439          * @param string $fname
 440          * @return array|false
 441          */
 442         private function loadFieldsWithTimestamp( $dbr, $fname ) {
 443                 $fieldMap = false;
 444
 445                 $row = $dbr->selectRow( 'image', $this->getLazyCacheFields( 'img_' ),
 446                         array( 'img_name' => $this->getName(), 'img_timestamp' => $this->getTimestamp() ),
 447                         $fname );
 448                 if ( $row ) {
 449                         $fieldMap = $this->unprefixRow( $row, 'img_' );
 450                 } else {
 451                         # File may have been uploaded over in the meantime; check the old versions
 452                         $row = $dbr->selectRow( 'oldimage', $this->getLazyCacheFields( 'oi_' ),
 453                                 array( 'oi_name' => $this->getName(), 'oi_timestamp' => $this->getTimestamp() ),
 454                                 $fname );
 455                         if ( $row ) {
 456                                 $fieldMap = $this->unprefixRow( $row, 'oi_' );
 457                         }
 458                 }
 459
 460                 return $fieldMap;
 461         }
 462
 463         /**
 464          * @param array $row Row
 465          * @param string $prefix
 466          * @throws MWException
 467          * @return array
 468          */
 469         protected function unprefixRow( $row, $prefix = 'img_' ) {
 470                 $array = (array)$row;
 471                 $prefixLength = strlen( $prefix );
 472
 473                 // Sanity check prefix once
 474                 if ( substr( key( $array ), 0, $prefixLength ) !== $prefix ) {
 475                         throw new MWException( __METHOD__ . ': incorrect $prefix parameter' );
 476                 }
 477
 478                 $decoded = array();
 479                 foreach ( $array as $name => $value ) {
 480                         $decoded[substr( $name, $prefixLength )] = $value;
 481                 }
 482
 483                 return $decoded;
 484         }
 485
 486         /**
 487          * Decode a row from the database (either object or array) to an array
 488          * with timestamps and MIME types decoded, and the field prefix removed.
 489          * @param object $row
 490          * @param string $prefix
 491          * @throws MWException
 492          * @return array
 493          */
 494         function decodeRow( $row, $prefix = 'img_' ) {
 495                 $decoded = $this->unprefixRow( $row, $prefix );
 496
 497                 $decoded['timestamp'] = wfTimestamp( TS_MW, $decoded['timestamp'] );
 498
 499                 $decoded['metadata'] = $this->repo->getSlaveDB()->decodeBlob( $decoded['metadata'] );
 500
 501                 if ( empty( $decoded['major_mime'] ) ) {
 502                         $decoded['mime'] = 'unknown/unknown';
 503                 } else {
 504                         if ( !$decoded['minor_mime'] ) {
 505                                 $decoded['minor_mime'] = 'unknown';
 506                         }
 507                         $decoded['mime'] = $decoded['major_mime'] . '/' . $decoded['minor_mime'];
 508                 }
 509
 510                 # Trim zero padding from char/binary field
 511                 $decoded['sha1'] = rtrim( $decoded['sha1'], "\0" );
 512
 513                 return $decoded;
 514         }
 515
 516         /**
 517          * Load file metadata from a DB result row
 518          *
 519          * @param object $row
 520          * @param string $prefix
 521          */
 522         function loadFromRow( $row, $prefix = 'img_' ) {
 523                 $this->dataLoaded = true;
 524                 $this->extraDataLoaded = true;
 525
 526                 $array = $this->decodeRow( $row, $prefix );
 527
 528                 foreach ( $array as $name => $value ) {
 529                         $this->$name = $value;
 530                 }
 531
 532                 $this->fileExists = true;
 533                 $this->maybeUpgradeRow();
 534         }
 535
 536         /**
 537          * Load file metadata from cache or DB, unless already loaded
 538          * @param int $flags
 539          */
 540         function load( $flags = 0 ) {
 541                 if ( !$this->dataLoaded ) {
 542                         if ( !$this->loadFromCache() ) {
 543                                 $this->loadFromDB( $this->isVolatile() ? 0 : self::LOAD_VIA_SLAVE );
 544                                 $this->saveToCache();
 545                         }
 546                         $this->dataLoaded = true;
 547                 }
 548                 if ( ( $flags & self::LOAD_ALL ) && !$this->extraDataLoaded ) {
 549                         $this->loadExtraFromDB();
 550                 }
 551         }
 552
 553         /**
 554          * Upgrade a row if it needs it
 555          */
 556         function maybeUpgradeRow() {
 557                 global $wgUpdateCompatibleMetadata;
 558                 if ( wfReadOnly() ) {
 559                         return;
 560                 }
 561
 562                 if ( is_null( $this->media_type ) ||
 563                         $this->mime == 'image/svg'
 564                 ) {
 565                         $this->upgradeRow();
 566                         $this->upgraded = true;
 567                 } else {
 568                         $handler = $this->getHandler();
 569                         if ( $handler ) {
 570                                 $validity = $handler->isMetadataValid( $this, $this->getMetadata() );
 571                                 if ( $validity === MediaHandler::METADATA_BAD
 572                                         || ( $validity === MediaHandler::METADATA_COMPATIBLE && $wgUpdateCompatibleMetadata )
 573                                 ) {
 574                                         $this->upgradeRow();
 575                                         $this->upgraded = true;
 576                                 }
 577                         }
 578                 }
 579         }
 580
 581         function getUpgraded() {
 582                 return $this->upgraded;
 583         }
 584
 585         /**
 586          * Fix assorted version-related problems with the image row by reloading it from the file
 587          */
 588         function upgradeRow() {
 589                 wfProfileIn( __METHOD__ );
 590
 591                 $this->lock(); // begin
 592
 593                 $this->loadFromFile();
 594
 595                 # Don't destroy file info of missing files
 596                 if ( !$this->fileExists ) {
 597                         wfDebug( __METHOD__ . ": file does not exist, aborting\n" );
 598                         wfProfileOut( __METHOD__ );
 599
 600                         return;
 601                 }
 602
 603                 $dbw = $this->repo->getMasterDB();
 604                 list( $major, $minor ) = self::splitMime( $this->mime );
 605
 606                 if ( wfReadOnly() ) {
 607                         wfProfileOut( __METHOD__ );
 608
 609                         return;
 610                 }
 611                 wfDebug( __METHOD__ . ': upgrading ' . $this->getName() . " to the current schema\n" );
 612
 613                 $dbw->update( 'image',
 614                         array(
 615                                 'img_size' => $this->size, // sanity
 616                                 'img_width' => $this->width,
 617                                 'img_height' => $this->height,
 618                                 'img_bits' => $this->bits,
 619                                 'img_media_type' => $this->media_type,
 620                                 'img_major_mime' => $major,
 621                                 'img_minor_mime' => $minor,
 622                                 'img_metadata' => $dbw->encodeBlob( $this->metadata ),
 623                                 'img_sha1' => $this->sha1,
 624                         ),
 625                         array( 'img_name' => $this->getName() ),
 626                         __METHOD__
 627                 );
 628
 629                 $this->saveToCache();
 630
 631                 $this->unlock(); // done
 632
 633                 wfProfileOut( __METHOD__ );
 634         }
 635
 636         /**
 637          * Set properties in this object to be equal to those given in the
 638          * associative array $info. Only cacheable fields can be set.
 639          * All fields *must* be set in $info except for getLazyCacheFields().
 640          *
 641          * If 'mime' is given, it will be split into major_mime/minor_mime.
 642          * If major_mime/minor_mime are given, $this->mime will also be set.
 643          *
 644          * @param array $info
 645          */
 646         function setProps( $info ) {
 647                 $this->dataLoaded = true;
 648                 $fields = $this->getCacheFields( '' );
 649                 $fields[] = 'fileExists';
 650
 651                 foreach ( $fields as $field ) {
 652                         if ( isset( $info[$field] ) ) {
 653                                 $this->$field = $info[$field];
 654                         }
 655                 }
 656
 657                 // Fix up mime fields
 658                 if ( isset( $info['major_mime'] ) ) {
 659                         $this->mime = "{$info['major_mime']}/{$info['minor_mime']}";
 660                 } elseif ( isset( $info['mime'] ) ) {
 661                         $this->mime = $info['mime'];
 662                         list( $this->major_mime, $this->minor_mime ) = self::splitMime( $this->mime );
 663                 }
 664         }
 665
 666         /** splitMime inherited */
 667         /** getName inherited */
 668         /** getTitle inherited */
 669         /** getURL inherited */
 670         /** getViewURL inherited */
 671         /** getPath inherited */
 672         /** isVisible inhereted */
 673
 674         /**
 675          * @return bool
 676          */
 677         function isMissing() {
 678                 if ( $this->missing === null ) {
 679                         list( $fileExists ) = $this->repo->fileExists( $this->getVirtualUrl() );
 680                         $this->missing = !$fileExists;
 681                 }
 682
 683                 return $this->missing;
 684         }
 685
 686         /**
 687          * Return the width of the image
 688          *
 689          * @param int $page
 690          * @return int
 691          */
 692         public function getWidth( $page = 1 ) {
 693                 $this->load();
 694
 695                 if ( $this->isMultipage() ) {
 696                         $handler = $this->getHandler();
 697                         if ( !$handler ) {
 698                                 return 0;
 699                         }
 700                         $dim = $handler->getPageDimensions( $this, $page );
 701                         if ( $dim ) {
 702                                 return $dim['width'];
 703                         } else {
 704                                 // For non-paged media, the false goes through an
 705                                 // intval, turning failure into 0, so do same here.
 706                                 return 0;
 707                         }
 708                 } else {
 709                         return $this->width;
 710                 }
 711         }
 712
 713         /**
 714          * Return the height of the image
 715          *
 716          * @param int $page
 717          * @return int
 718          */
 719         public function getHeight( $page = 1 ) {
 720                 $this->load();
 721
 722                 if ( $this->isMultipage() ) {
 723                         $handler = $this->getHandler();
 724                         if ( !$handler ) {
 725                                 return 0;
 726                         }
 727                         $dim = $handler->getPageDimensions( $this, $page );
 728                         if ( $dim ) {
 729                                 return $dim['height'];
 730                         } else {
 731                                 // For non-paged media, the false goes through an
 732                                 // intval, turning failure into 0, so do same here.
 733                                 return 0;
 734                         }
 735                 } else {
 736                         return $this->height;
 737                 }
 738         }
 739
 740         /**
 741          * Returns ID or name of user who uploaded the file
 742          *
 743          * @param string $type 'text' or 'id'
 744          * @return int|string
 745          */
 746         function getUser( $type = 'text' ) {
 747                 $this->load();
 748
 749                 if ( $type == 'text' ) {
 750                         return $this->user_text;
 751                 } elseif ( $type == 'id' ) {
 752                         return $this->user;
 753                 }
 754         }
 755
 756         /**
 757          * Get handler-specific metadata
 758          * @return string
 759          */
 760         function getMetadata() {
 761                 $this->load( self::LOAD_ALL ); // large metadata is loaded in another step
 762                 return $this->metadata;
 763         }
 764
 765         /**
 766          * @return int
 767          */
 768         function getBitDepth() {
 769                 $this->load();
 770
 771                 return $this->bits;
 772         }
 773
 774         /**
 775          * Returns the size of the image file, in bytes
 776          * @return int
 777          */
 778         public function getSize() {
 779                 $this->load();
 780
 781                 return $this->size;
 782         }
 783
 784         /**
 785          * Returns the mime type of the file.
 786          * @return string
 787          */
 788         function getMimeType() {
 789                 $this->load();
 790
 791                 return $this->mime;
 792         }
 793
 794         /**
 795          * Returns the type of the media in the file.
 796          * Use the value returned by this function with the MEDIATYPE_xxx constants.
 797          * @return string
 798          */
 799         function getMediaType() {
 800                 $this->load();
 801
 802                 return $this->media_type;
 803         }
 804
 805         /** canRender inherited */
 806         /** mustRender inherited */
 807         /** allowInlineDisplay inherited */
 808         /** isSafeFile inherited */
 809         /** isTrustedFile inherited */
 810
 811         /**
 812          * Returns true if the file exists on disk.
 813          * @return bool Whether file exist on disk.
 814          */
 815         public function exists() {
 816                 $this->load();
 817
 818                 return $this->fileExists;
 819         }
 820
 821         /** getTransformScript inherited */
 822         /** getUnscaledThumb inherited */
 823         /** thumbName inherited */
 824         /** createThumb inherited */
 825         /** transform inherited */
 826
 827         /** getHandler inherited */
 828         /** iconThumb inherited */
 829         /** getLastError inherited */
 830
 831         /**
 832          * Get all thumbnail names previously generated for this file
 833          * @param string|bool $archiveName Name of an archive file, default false
 834          * @return array first element is the base dir, then files in that base dir.
 835          */
 836         function getThumbnails( $archiveName = false ) {
 837                 if ( $archiveName ) {
 838                         $dir = $this->getArchiveThumbPath( $archiveName );
 839                 } else {
 840                         $dir = $this->getThumbPath();
 841                 }
 842
 843                 $backend = $this->repo->getBackend();
 844                 $files = array( $dir );
 845                 try {
 846                         $iterator = $backend->getFileList( array( 'dir' => $dir ) );
 847                         foreach ( $iterator as $file ) {
 848                                 $files[] = $file;
 849                         }
 850                 } catch ( FileBackendError $e ) {
 851                 } // suppress (bug 54674)
 852
 853                 return $files;
 854         }
 855
 856         /**
 857          * Refresh metadata in memcached, but don't touch thumbnails or squid
 858          */
 859         function purgeMetadataCache() {
 860                 $this->loadFromDB();
 861                 $this->saveToCache();
 862                 $this->purgeHistory();
 863         }
 864
 865         /**
 866          * Purge the shared history (OldLocalFile) cache.
 867          *
 868          * @note This used to purge old thumbnails as well.
 869          */
 870         function purgeHistory() {
 871                 global $wgMemc;
 872
 873                 $hashedName = md5( $this->getName() );
 874                 $oldKey = $this->repo->getSharedCacheKey( 'oldfile', $hashedName );
 875
 876                 if ( $oldKey ) {
 877                         $wgMemc->delete( $oldKey );
 878                 }
 879         }
 880
 881         /**
 882          * Delete all previously generated thumbnails, refresh metadata in memcached and purge the squid.
 883          *
 884          * @param array $options An array potentially with the key forThumbRefresh.
 885          *
 886          * @note This used to purge old thumbnails by default as well, but doesn't anymore.
 887          */
 888         function purgeCache( $options = array() ) {
 889                 wfProfileIn( __METHOD__ );
 890                 // Refresh metadata cache
 891                 $this->purgeMetadataCache();
 892
 893                 // Delete thumbnails
 894                 $this->purgeThumbnails( $options );
 895
 896                 // Purge squid cache for this file
 897                 SquidUpdate::purge( array( $this->getURL() ) );
 898                 wfProfileOut( __METHOD__ );
 899         }
 900
 901         /**
 902          * Delete cached transformed files for an archived version only.
 903          * @param string $archiveName Name of the archived file
 904          */
 905         function purgeOldThumbnails( $archiveName ) {
 906                 global $wgUseSquid;
 907                 wfProfileIn( __METHOD__ );
 908
 909                 // Get a list of old thumbnails and URLs
 910                 $files = $this->getThumbnails( $archiveName );
 911
 912                 // Purge any custom thumbnail caches
 913                 wfRunHooks( 'LocalFilePurgeThumbnails', array( $this, $archiveName ) );
 914
 915                 $dir = array_shift( $files );
 916                 $this->purgeThumbList( $dir, $files );
 917
 918                 // Purge the squid
 919                 if ( $wgUseSquid ) {
 920                         $urls = array();
 921                         foreach ( $files as $file ) {
 922                                 $urls[] = $this->getArchiveThumbUrl( $archiveName, $file );
 923                         }
 924                         SquidUpdate::purge( $urls );
 925                 }
 926
 927                 wfProfileOut( __METHOD__ );
 928         }
 929
 930         /**
 931          * Delete cached transformed files for the current version only.
 932          */
 933         function purgeThumbnails( $options = array() ) {
 934                 global $wgUseSquid;
 935                 wfProfileIn( __METHOD__ );
 936
 937                 // Delete thumbnails
 938                 $files = $this->getThumbnails();
 939                 // Always purge all files from squid regardless of handler filters
 940                 $urls = array();
 941                 if ( $wgUseSquid ) {
 942                         foreach ( $files as $file ) {
 943                                 $urls[] = $this->getThumbUrl( $file );
 944                         }
 945                         array_shift( $urls ); // don't purge directory
 946                 }
 947
 948                 // Give media handler a chance to filter the file purge list
 949                 if ( !empty( $options['forThumbRefresh'] ) ) {
 950                         $handler = $this->getHandler();
 951                         if ( $handler ) {
 952                                 $handler->filterThumbnailPurgeList( $files, $options );
 953                         }
 954                 }
 955
 956                 // Purge any custom thumbnail caches
 957                 wfRunHooks( 'LocalFilePurgeThumbnails', array( $this, false ) );
 958
 959                 $dir = array_shift( $files );
 960                 $this->purgeThumbList( $dir, $files );
 961
 962                 // Purge the squid
 963                 if ( $wgUseSquid ) {
 964                         SquidUpdate::purge( $urls );
 965                 }
 966
 967                 wfProfileOut( __METHOD__ );
 968         }
 969
 970         /**
 971          * Delete a list of thumbnails visible at urls
 972          * @param string $dir Base dir of the files.
 973          * @param array $files Array of strings: relative filenames (to $dir)
 974          */
 975         protected function purgeThumbList( $dir, $files ) {
 976                 $fileListDebug = strtr(
 977                         var_export( $files, true ),
 978                         array( "\n" => '' )
 979                 );
 980                 wfDebug( __METHOD__ . ": $fileListDebug\n" );
 981
 982                 $purgeList = array();
 983                 foreach ( $files as $file ) {
 984                         # Check that the base file name is part of the thumb name
 985                         # This is a basic sanity check to avoid erasing unrelated directories
 986                         if ( strpos( $file, $this->getName() ) !== false
 987                                 || strpos( $file, "-thumbnail" ) !== false // "short" thumb name
 988                         ) {
 989                                 $purgeList[] = "{$dir}/{$file}";
 990                         }
 991                 }
 992
 993                 # Delete the thumbnails
 994                 $this->repo->quickPurgeBatch( $purgeList );
 995                 # Clear out the thumbnail directory if empty
 996                 $this->repo->quickCleanDir( $dir );
 997         }
 998
 999         /** purgeDescription inherited */
1000         /** purgeEverything inherited */
1001
1002         /**
1003          * @param int $limit Optional: Limit to number of results
1004          * @param int $start Optional: Timestamp, start from
1005          * @param int $end Optional: Timestamp, end at
1006          * @param bool $inc
1007          * @return array
1008          */
1009         function getHistory( $limit = null, $start = null, $end = null, $inc = true ) {
1010                 $dbr = $this->repo->getSlaveDB();
1011                 $tables = array( 'oldimage' );
1012                 $fields = OldLocalFile::selectFields();
1013                 $conds = $opts = $join_conds = array();
1014                 $eq = $inc ? '=' : '';
1015                 $conds[] = "oi_name = " . $dbr->addQuotes( $this->title->getDBkey() );
1016
1017                 if ( $start ) {
1018                         $conds[] = "oi_timestamp <$eq " . $dbr->addQuotes( $dbr->timestamp( $start ) );
1019                 }
1020
1021                 if ( $end ) {
1022                         $conds[] = "oi_timestamp >$eq " . $dbr->addQuotes( $dbr->timestamp( $end ) );
1023                 }
1024
1025                 if ( $limit ) {
1026                         $opts['LIMIT'] = $limit;
1027                 }
1028
1029                 // Search backwards for time > x queries
1030                 $order = ( !$start && $end !== null ) ? 'ASC' : 'DESC';
1031                 $opts['ORDER BY'] = "oi_timestamp $order";
1032                 $opts['USE INDEX'] = array( 'oldimage' => 'oi_name_timestamp' );
1033
1034                 wfRunHooks( 'LocalFile::getHistory', array( &$this, &$tables, &$fields,
1035                         &$conds, &$opts, &$join_conds ) );
1036
1037                 $res = $dbr->select( $tables, $fields, $conds, __METHOD__, $opts, $join_conds );
1038                 $r = array();
1039
1040                 foreach ( $res as $row ) {
1041                         $r[] = $this->repo->newFileFromRow( $row );
1042                 }
1043
1044                 if ( $order == 'ASC' ) {
1045                         $r = array_reverse( $r ); // make sure it ends up descending
1046                 }
1047
1048                 return $r;
1049         }
1050
1051         /**
1052          * Returns the history of this file, line by line.
1053          * starts with current version, then old versions.
1054          * uses $this->historyLine to check which line to return:
1055          *  0      return line for current version
1056          *  1      query for old versions, return first one
1057          *  2, ... return next old version from above query
1058          * @return bool
1059          */
1060         public function nextHistoryLine() {
1061                 # Polymorphic function name to distinguish foreign and local fetches
1062                 $fname = get_class( $this ) . '::' . __FUNCTION__;
1063
1064                 $dbr = $this->repo->getSlaveDB();
1065
1066                 if ( $this->historyLine == 0 ) { // called for the first time, return line from cur
1067                         $this->historyRes = $dbr->select( 'image',
1068                                 array(
1069                                         '*',
1070                                         "'' AS oi_archive_name",
1071                                         '0 as oi_deleted',
1072                                         'img_sha1'
1073                                 ),
1074                                 array( 'img_name' => $this->title->getDBkey() ),
1075                                 $fname
1076                         );
1077
1078                         if ( 0 == $dbr->numRows( $this->historyRes ) ) {
1079                                 $this->historyRes = null;
1080
1081                                 return false;
1082                         }
1083                 } elseif ( $this->historyLine == 1 ) {
1084                         $this->historyRes = $dbr->select( 'oldimage', '*',
1085                                 array( 'oi_name' => $this->title->getDBkey() ),
1086                                 $fname,
1087                                 array( 'ORDER BY' => 'oi_timestamp DESC' )
1088                         );
1089                 }
1090                 $this->historyLine++;
1091
1092                 return $dbr->fetchObject( $this->historyRes );
1093         }
1094
1095         /**
1096          * Reset the history pointer to the first element of the history
1097          */
1098         public function resetHistory() {
1099                 $this->historyLine = 0;
1100
1101                 if ( !is_null( $this->historyRes ) ) {
1102                         $this->historyRes = null;
1103                 }
1104         }
1105
1106         /** getHashPath inherited */
1107         /** getRel inherited */
1108         /** getUrlRel inherited */
1109         /** getArchiveRel inherited */
1110         /** getArchivePath inherited */
1111         /** getThumbPath inherited */
1112         /** getArchiveUrl inherited */
1113         /** getThumbUrl inherited */
1114         /** getArchiveVirtualUrl inherited */
1115         /** getThumbVirtualUrl inherited */
1116         /** isHashed inherited */
1117
1118         /**
1119          * Upload a file and record it in the DB
1120          * @param string $srcPath Source storage path, virtual URL, or filesystem path
1121          * @param string $comment Upload description
1122          * @param string $pageText Text to use for the new description page,
1123          *   if a new description page is created
1124          * @param int|bool $flags Flags for publish()
1125          * @param array|bool $props File properties, if known. This can be used to
1126          *   reduce the upload time when uploading virtual URLs for which the file
1127          *   info is already known
1128          * @param string|bool $timestamp Timestamp for img_timestamp, or false to use the
1129          *   current time
1130          * @param User|null $user User object or null to use $wgUser
1131          *
1132          * @return FileRepoStatus On success, the value member contains the
1133          *     archive name, or an empty string if it was a new file.
1134          */
1135         function upload( $srcPath, $comment, $pageText, $flags = 0, $props = false,
1136                 $timestamp = false, $user = null
1137         ) {
1138                 global $wgContLang;
1139
1140                 if ( $this->getRepo()->getReadOnlyReason() !== false ) {
1141                         return $this->readOnlyFatalStatus();
1142                 }
1143
1144                 if ( !$props ) {
1145                         wfProfileIn( __METHOD__ . '-getProps' );
1146                         if ( $this->repo->isVirtualUrl( $srcPath )
1147                                 || FileBackend::isStoragePath( $srcPath )
1148                         ) {
1149                                 $props = $this->repo->getFileProps( $srcPath );
1150                         } else {
1151                                 $props = FSFile::getPropsFromPath( $srcPath );
1152                         }
1153                         wfProfileOut( __METHOD__ . '-getProps' );
1154                 }
1155
1156                 $options = array();
1157                 $handler = MediaHandler::getHandler( $props['mime'] );
1158                 if ( $handler ) {
1159                         $options['headers'] = $handler->getStreamHeaders( $props['metadata'] );
1160                 } else {
1161                         $options['headers'] = array();
1162                 }
1163
1164                 // Trim spaces on user supplied text
1165                 $comment = trim( $comment );
1166
1167                 // Truncate nicely or the DB will do it for us
1168                 // non-nicely (dangling multi-byte chars, non-truncated version in cache).
1169                 $comment = $wgContLang->truncate( $comment, 255 );
1170                 $this->lock(); // begin
1171                 $status = $this->publish( $srcPath, $flags, $options );
1172
1173                 if ( $status->successCount >= 2 ) {
1174                         // There will be a copy+(one of move,copy,store).
1175                         // The first succeeding does not commit us to updating the DB
1176                         // since it simply copied the current version to a timestamped file name.
1177                         // It is only *preferable* to avoid leaving such files orphaned.
1178                         // Once the second operation goes through, then the current version was
1179                         // updated and we must therefore update the DB too.
1180                         if ( !$this->recordUpload2( $status->value, $comment, $pageText, $props, $timestamp, $user ) ) {
1181                                 $status->fatal( 'filenotfound', $srcPath );
1182                         }
1183                 }
1184
1185                 $this->unlock(); // done
1186
1187                 return $status;
1188         }
1189
1190         /**
1191          * Record a file upload in the upload log and the image table
1192          * @param string $oldver
1193          * @param string $desc
1194          * @param string $license
1195          * @param string $copyStatus
1196          * @param string $source
1197          * @param bool $watch
1198          * @param string|bool $timestamp
1199          * @param User|null $user User object or null to use $wgUser
1200          * @return bool
1201          */
1202         function recordUpload( $oldver, $desc, $license = '', $copyStatus = '', $source = '',
1203                 $watch = false, $timestamp = false, User $user = null ) {
1204                 if ( !$user ) {
1205                         global $wgUser;
1206                         $user = $wgUser;
1207                 }
1208
1209                 $pageText = SpecialUpload::getInitialPageText( $desc, $license, $copyStatus, $source );
1210
1211                 if ( !$this->recordUpload2( $oldver, $desc, $pageText, false, $timestamp, $user ) ) {
1212                         return false;
1213                 }
1214
1215                 if ( $watch ) {
1216                         $user->addWatch( $this->getTitle() );
1217                 }
1218
1219                 return true;
1220         }
1221
1222         /**
1223          * Record a file upload in the upload log and the image table
1224          * @param string $oldver
1225          * @param string $comment
1226          * @param string $pageText
1227          * @param bool|array $props
1228          * @param string|bool $timestamp
1229          * @param null|User $user
1230          * @return bool
1231          */
1232         function recordUpload2( $oldver, $comment, $pageText, $props = false, $timestamp = false,
1233                 $user = null
1234         ) {
1235                 wfProfileIn( __METHOD__ );
1236
1237                 if ( is_null( $user ) ) {
1238                         global $wgUser;
1239                         $user = $wgUser;
1240                 }
1241
1242                 $dbw = $this->repo->getMasterDB();
1243                 $dbw->begin( __METHOD__ );
1244
1245                 if ( !$props ) {
1246                         wfProfileIn( __METHOD__ . '-getProps' );
1247                         $props = $this->repo->getFileProps( $this->getVirtualUrl() );
1248                         wfProfileOut( __METHOD__ . '-getProps' );
1249                 }
1250
1251                 if ( $timestamp === false ) {
1252                         $timestamp = $dbw->timestamp();
1253                 }
1254
1255                 $props['description'] = $comment;
1256                 $props['user'] = $user->getId();
1257                 $props['user_text'] = $user->getName();
1258                 $props['timestamp'] = wfTimestamp( TS_MW, $timestamp ); // DB -> TS_MW
1259                 $this->setProps( $props );
1260
1261                 # Fail now if the file isn't there
1262                 if ( !$this->fileExists ) {
1263                         wfDebug( __METHOD__ . ": File " . $this->getRel() . " went missing!\n" );
1264                         wfProfileOut( __METHOD__ );
1265
1266                         return false;
1267                 }
1268
1269                 $reupload = false;
1270
1271                 # Test to see if the row exists using INSERT IGNORE
1272                 # This avoids race conditions by locking the row until the commit, and also
1273                 # doesn't deadlock. SELECT FOR UPDATE causes a deadlock for every race condition.
1274                 $dbw->insert( 'image',
1275                         array(
1276                                 'img_name' => $this->getName(),
1277                                 'img_size' => $this->size,
1278                                 'img_width' => intval( $this->width ),
1279                                 'img_height' => intval( $this->height ),
1280                                 'img_bits' => $this->bits,
1281                                 'img_media_type' => $this->media_type,
1282                                 'img_major_mime' => $this->major_mime,
1283                                 'img_minor_mime' => $this->minor_mime,
1284                                 'img_timestamp' => $timestamp,
1285                                 'img_description' => $comment,
1286                                 'img_user' => $user->getId(),
1287                                 'img_user_text' => $user->getName(),
1288                                 'img_metadata' => $dbw->encodeBlob( $this->metadata ),
1289                                 'img_sha1' => $this->sha1
1290                         ),
1291                         __METHOD__,
1292                         'IGNORE'
1293                 );
1294                 if ( $dbw->affectedRows() == 0 ) {
1295                         # (bug 34993) Note: $oldver can be empty here, if the previous
1296                         # version of the file was broken. Allow registration of the new
1297                         # version to continue anyway, because that's better than having
1298                         # an image that's not fixable by user operations.
1299
1300                         $reupload = true;
1301                         # Collision, this is an update of a file
1302                         # Insert previous contents into oldimage
1303                         $dbw->insertSelect( 'oldimage', 'image',
1304                                 array(
1305                                         'oi_name' => 'img_name',
1306                                         'oi_archive_name' => $dbw->addQuotes( $oldver ),
1307                                         'oi_size' => 'img_size',
1308                                         'oi_width' => 'img_width',
1309                                         'oi_height' => 'img_height',
1310                                         'oi_bits' => 'img_bits',
1311                                         'oi_timestamp' => 'img_timestamp',
1312                                         'oi_description' => 'img_description',
1313                                         'oi_user' => 'img_user',
1314                                         'oi_user_text' => 'img_user_text',
1315                                         'oi_metadata' => 'img_metadata',
1316                                         'oi_media_type' => 'img_media_type',
1317                                         'oi_major_mime' => 'img_major_mime',
1318                                         'oi_minor_mime' => 'img_minor_mime',
1319                                         'oi_sha1' => 'img_sha1'
1320                                 ),
1321                                 array( 'img_name' => $this->getName() ),
1322                                 __METHOD__
1323                         );
1324
1325                         # Update the current image row
1326                         $dbw->update( 'image',
1327                                 array( /* SET */
1328                                         'img_size' => $this->size,
1329                                         'img_width' => intval( $this->width ),
1330                                         'img_height' => intval( $this->height ),
1331                                         'img_bits' => $this->bits,
1332                                         'img_media_type' => $this->media_type,
1333                                         'img_major_mime' => $this->major_mime,
1334                                         'img_minor_mime' => $this->minor_mime,
1335                                         'img_timestamp' => $timestamp,
1336                                         'img_description' => $comment,
1337                                         'img_user' => $user->getId(),
1338                                         'img_user_text' => $user->getName(),
1339                                         'img_metadata' => $dbw->encodeBlob( $this->metadata ),
1340                                         'img_sha1' => $this->sha1
1341                                 ),
1342                                 array( 'img_name' => $this->getName() ),
1343                                 __METHOD__
1344                         );
1345                 } else {
1346                         # This is a new file, so update the image count
1347                         DeferredUpdates::addUpdate( SiteStatsUpdate::factory( array( 'images' => 1 ) ) );
1348                 }
1349
1350                 $descTitle = $this->getTitle();
1351                 $wikiPage = new WikiFilePage( $descTitle );
1352                 $wikiPage->setFile( $this );
1353
1354                 # Add the log entry
1355                 $action = $reupload ? 'overwrite' : 'upload';
1356
1357                 $logEntry = new ManualLogEntry( 'upload', $action );
1358                 $logEntry->setPerformer( $user );
1359                 $logEntry->setComment( $comment );
1360                 $logEntry->setTarget( $descTitle );
1361
1362                 // Allow people using the api to associate log entries with the upload.
1363                 // Log has a timestamp, but sometimes different from upload timestamp.
1364                 $logEntry->setParameters(
1365                         array(
1366                                 'img_sha1' => $this->sha1,
1367                                 'img_timestamp' => $timestamp,
1368                         )
1369                 );
1370                 // Note we keep $logId around since during new image
1371                 // creation, page doesn't exist yet, so log_page = 0
1372                 // but we want it to point to the page we're making,
1373                 // so we later modify the log entry.
1374                 // For a similar reason, we avoid making an RC entry
1375                 // now and wait until the page exists.
1376                 $logId = $logEntry->insert();
1377
1378                 $exists = $descTitle->exists();
1379                 if ( $exists ) {
1380                         // Page exists, do RC entry now (otherwise we wait for later).
1381                         $logEntry->publish( $logId );
1382                 }
1383                 wfProfileIn( __METHOD__ . '-edit' );
1384
1385                 if ( $exists ) {
1386                         # Create a null revision
1387                         $latest = $descTitle->getLatestRevID();
1388                         $editSummary = LogFormatter::newFromEntry( $logEntry )->getPlainActionText();
1389
1390                         $nullRevision = Revision::newNullRevision(
1391                                 $dbw,
1392                                 $descTitle->getArticleID(),
1393                                 $editSummary,
1394                                 false,
1395                                 $user
1396                         );
1397                         if ( !is_null( $nullRevision ) ) {
1398                                 $nullRevision->insertOn( $dbw );
1399
1400                                 wfRunHooks( 'NewRevisionFromEditComplete', array( $wikiPage, $nullRevision, $latest, $user ) );
1401                                 $wikiPage->updateRevisionOn( $dbw, $nullRevision );
1402                         }
1403                 }
1404
1405                 # Commit the transaction now, in case something goes wrong later
1406                 # The most important thing is that files don't get lost, especially archives
1407                 # NOTE: once we have support for nested transactions, the commit may be moved
1408                 #       to after $wikiPage->doEdit has been called.
1409                 $dbw->commit( __METHOD__ );
1410
1411                 # Save to memcache.
1412                 # We shall not saveToCache before the commit since otherwise
1413                 # in case of a rollback there is an usable file from memcached
1414                 # which in fact doesn't really exist (bug 24978)
1415                 $this->saveToCache();
1416
1417                 if ( $exists ) {
1418                         # Invalidate the cache for the description page
1419                         $descTitle->invalidateCache();
1420                         $descTitle->purgeSquid();
1421                 } else {
1422                         # New file; create the description page.
1423                         # There's already a log entry, so don't make a second RC entry
1424                         # Squid and file cache for the description page are purged by doEditContent.
1425                         $content = ContentHandler::makeContent( $pageText, $descTitle );
1426                         $status = $wikiPage->doEditContent(
1427                                 $content,
1428                                 $comment,
1429                                 EDIT_NEW | EDIT_SUPPRESS_RC,
1430                                 false,
1431                                 $user
1432                         );
1433
1434                         $dbw->begin( __METHOD__ ); // XXX; doEdit() uses a transaction
1435                         // Now that the page exists, make an RC entry.
1436                         $logEntry->publish( $logId );
1437                         if ( isset( $status->value['revision'] ) ) {
1438                                 $dbw->update( 'logging',
1439                                         array( 'log_page' => $status->value['revision']->getPage() ),
1440                                         array( 'log_id' => $logId ),
1441                                         __METHOD__
1442                                 );
1443                         }
1444                         $dbw->commit( __METHOD__ ); // commit before anything bad can happen
1445                 }
1446
1447                 wfProfileOut( __METHOD__ . '-edit' );
1448
1449                 if ( $reupload ) {
1450                         # Delete old thumbnails
1451                         wfProfileIn( __METHOD__ . '-purge' );
1452                         $this->purgeThumbnails();
1453                         wfProfileOut( __METHOD__ . '-purge' );
1454
1455                         # Remove the old file from the squid cache
1456                         SquidUpdate::purge( array( $this->getURL() ) );
1457                 }
1458
1459                 # Hooks, hooks, the magic of hooks...
1460                 wfProfileIn( __METHOD__ . '-hooks' );
1461                 wfRunHooks( 'FileUpload', array( $this, $reupload, $descTitle->exists() ) );
1462                 wfProfileOut( __METHOD__ . '-hooks' );
1463
1464                 # Invalidate cache for all pages using this file
1465                 $update = new HTMLCacheUpdate( $this->getTitle(), 'imagelinks' );
1466                 $update->doUpdate();
1467                 if ( !$reupload ) {
1468                         LinksUpdate::queueRecursiveJobsForTable( $this->getTitle(), 'imagelinks' );
1469                 }
1470
1471                 wfProfileOut( __METHOD__ );
1472
1473                 return true;
1474         }
1475
1476         /**
1477          * Move or copy a file to its public location. If a file exists at the
1478          * destination, move it to an archive. Returns a FileRepoStatus object with
1479          * the archive name in the "value" member on success.
1480          *
1481          * The archive name should be passed through to recordUpload for database
1482          * registration.
1483          *
1484          * @param string $srcPath Local filesystem path to the source image
1485          * @param int $flags A bitwise combination of:
1486          *     File::DELETE_SOURCE    Delete the source file, i.e. move rather than copy
1487          * @param array $options Optional additional parameters
1488          * @return FileRepoStatus On success, the value member contains the
1489          *     archive name, or an empty string if it was a new file.
1490          */
1491         function publish( $srcPath, $flags = 0, array $options = array() ) {
1492                 return $this->publishTo( $srcPath, $this->getRel(), $flags, $options );
1493         }
1494
1495         /**
1496          * Move or copy a file to a specified location. Returns a FileRepoStatus
1497          * object with the archive name in the "value" member on success.
1498          *
1499          * The archive name should be passed through to recordUpload for database
1500          * registration.
1501          *
1502          * @param string $srcPath Local filesystem path to the source image
1503          * @param string $dstRel Target relative path
1504          * @param int $flags A bitwise combination of:
1505          *     File::DELETE_SOURCE    Delete the source file, i.e. move rather than copy
1506          * @param array $options Optional additional parameters
1507          * @return FileRepoStatus On success, the value member contains the
1508          *     archive name, or an empty string if it was a new file.
1509          */
1510         function publishTo( $srcPath, $dstRel, $flags = 0, array $options = array() ) {
1511                 if ( $this->getRepo()->getReadOnlyReason() !== false ) {
1512                         return $this->readOnlyFatalStatus();
1513                 }
1514
1515                 $this->lock(); // begin
1516
1517                 $archiveName = wfTimestamp( TS_MW ) . '!' . $this->getName();
1518                 $archiveRel = 'archive/' . $this->getHashPath() . $archiveName;
1519                 $flags = $flags & File::DELETE_SOURCE ? LocalRepo::DELETE_SOURCE : 0;
1520                 $status = $this->repo->publish( $srcPath, $dstRel, $archiveRel, $flags, $options );
1521
1522                 if ( $status->value == 'new' ) {
1523                         $status->value = '';
1524                 } else {
1525                         $status->value = $archiveName;
1526                 }
1527
1528                 $this->unlock(); // done
1529
1530                 return $status;
1531         }
1532
1533         /** getLinksTo inherited */
1534         /** getExifData inherited */
1535         /** isLocal inherited */
1536         /** wasDeleted inherited */
1537
1538         /**
1539          * Move file to the new title
1540          *
1541          * Move current, old version and all thumbnails
1542          * to the new filename. Old file is deleted.
1543          *
1544          * Cache purging is done; checks for validity
1545          * and logging are caller's responsibility
1546          *
1547          * @param Title $target New file name
1548          * @return FileRepoStatus
1549          */
1550         function move( $target ) {
1551                 if ( $this->getRepo()->getReadOnlyReason() !== false ) {
1552                         return $this->readOnlyFatalStatus();
1553                 }
1554
1555                 wfDebugLog( 'imagemove', "Got request to move {$this->name} to " . $target->getText() );
1556                 $batch = new LocalFileMoveBatch( $this, $target );
1557
1558                 $this->lock(); // begin
1559                 $batch->addCurrent();
1560                 $archiveNames = $batch->addOlds();
1561                 $status = $batch->execute();
1562                 $this->unlock(); // done
1563
1564                 wfDebugLog( 'imagemove', "Finished moving {$this->name}" );
1565
1566                 // Purge the source and target files...
1567                 $oldTitleFile = wfLocalFile( $this->title );
1568                 $newTitleFile = wfLocalFile( $target );
1569                 // Hack: the lock()/unlock() pair is nested in a transaction so the locking is not
1570                 // tied to BEGIN/COMMIT. To avoid slow purges in the transaction, move them outside.
1571                 $this->getRepo()->getMasterDB()->onTransactionIdle(
1572                         function () use ( $oldTitleFile, $newTitleFile, $archiveNames ) {
1573                                 $oldTitleFile->purgeEverything();
1574                                 foreach ( $archiveNames as $archiveName ) {
1575                                         $oldTitleFile->purgeOldThumbnails( $archiveName );
1576                                 }
1577                                 $newTitleFile->purgeEverything();
1578                         }
1579                 );
1580
1581                 if ( $status->isOK() ) {
1582                         // Now switch the object
1583                         $this->title = $target;
1584                         // Force regeneration of the name and hashpath
1585                         unset( $this->name );
1586                         unset( $this->hashPath );
1587                 }
1588
1589                 return $status;
1590         }
1591
1592         /**
1593          * Delete all versions of the file.
1594          *
1595          * Moves the files into an archive directory (or deletes them)
1596          * and removes the database rows.
1597          *
1598          * Cache purging is done; logging is caller's responsibility.
1599          *
1600          * @param string $reason
1601          * @param bool $suppress
1602          * @param User|null $user
1603          * @return FileRepoStatus
1604          */
1605         function delete( $reason, $suppress = false, $user = null ) {
1606                 if ( $this->getRepo()->getReadOnlyReason() !== false ) {
1607                         return $this->readOnlyFatalStatus();
1608                 }
1609
1610                 $batch = new LocalFileDeleteBatch( $this, $reason, $suppress, $user );
1611
1612                 $this->lock(); // begin
1613                 $batch->addCurrent();
1614                 # Get old version relative paths
1615                 $archiveNames = $batch->addOlds();
1616                 $status = $batch->execute();
1617                 $this->unlock(); // done
1618
1619                 if ( $status->isOK() ) {
1620                         DeferredUpdates::addUpdate( SiteStatsUpdate::factory( array( 'images' => -1 ) ) );
1621                 }
1622
1623                 // Hack: the lock()/unlock() pair is nested in a transaction so the locking is not
1624                 // tied to BEGIN/COMMIT. To avoid slow purges in the transaction, move them outside.
1625                 $file = $this;
1626                 $this->getRepo()->getMasterDB()->onTransactionIdle(
1627                         function () use ( $file, $archiveNames ) {
1628                                 global $wgUseSquid;
1629
1630                                 $file->purgeEverything();
1631                                 foreach ( $archiveNames as $archiveName ) {
1632                                         $file->purgeOldThumbnails( $archiveName );
1633                                 }
1634
1635                                 if ( $wgUseSquid ) {
1636                                         // Purge the squid
1637                                         $purgeUrls = array();
1638                                         foreach ( $archiveNames as $archiveName ) {
1639                                                 $purgeUrls[] = $file->getArchiveUrl( $archiveName );
1640                                         }
1641                                         SquidUpdate::purge( $purgeUrls );
1642                                 }
1643                         }
1644                 );
1645
1646                 return $status;
1647         }
1648
1649         /**
1650          * Delete an old version of the file.
1651          *
1652          * Moves the file into an archive directory (or deletes it)
1653          * and removes the database row.
1654          *
1655          * Cache purging is done; logging is caller's responsibility.
1656          *
1657          * @param string $archiveName
1658          * @param string $reason
1659          * @param bool $suppress
1660          * @param User|null $user
1661          * @throws MWException Exception on database or file store failure
1662          * @return FileRepoStatus
1663          */
1664         function deleteOld( $archiveName, $reason, $suppress = false, $user = null ) {
1665                 global $wgUseSquid;
1666                 if ( $this->getRepo()->getReadOnlyReason() !== false ) {
1667                         return $this->readOnlyFatalStatus();
1668                 }
1669
1670                 $batch = new LocalFileDeleteBatch( $this, $reason, $suppress, $user );
1671
1672                 $this->lock(); // begin
1673                 $batch->addOld( $archiveName );
1674                 $status = $batch->execute();
1675                 $this->unlock(); // done
1676
1677                 $this->purgeOldThumbnails( $archiveName );
1678                 if ( $status->isOK() ) {
1679                         $this->purgeDescription();
1680                         $this->purgeHistory();
1681                 }
1682
1683                 if ( $wgUseSquid ) {
1684                         // Purge the squid
1685                         SquidUpdate::purge( array( $this->getArchiveUrl( $archiveName ) ) );
1686                 }
1687
1688                 return $status;
1689         }
1690
1691         /**
1692          * Restore all or specified deleted revisions to the given file.
1693          * Permissions and logging are left to the caller.
1694          *
1695          * May throw database exceptions on error.
1696          *
1697          * @param array $versions Set of record ids of deleted items to restore,
1698          *   or empty to restore all revisions.
1699          * @param bool $unsuppress
1700          * @return FileRepoStatus
1701          */
1702         function restore( $versions = array(), $unsuppress = false ) {
1703                 if ( $this->getRepo()->getReadOnlyReason() !== false ) {
1704                         return $this->readOnlyFatalStatus();
1705                 }
1706
1707                 $batch = new LocalFileRestoreBatch( $this, $unsuppress );
1708
1709                 $this->lock(); // begin
1710                 if ( !$versions ) {
1711                         $batch->addAll();
1712                 } else {
1713                         $batch->addIds( $versions );
1714                 }
1715                 $status = $batch->execute();
1716                 if ( $status->isGood() ) {
1717                         $cleanupStatus = $batch->cleanup();
1718                         $cleanupStatus->successCount = 0;
1719                         $cleanupStatus->failCount = 0;
1720                         $status->merge( $cleanupStatus );
1721                 }
1722                 $this->unlock(); // done
1723
1724                 return $status;
1725         }
1726
1727         /** isMultipage inherited */
1728         /** pageCount inherited */
1729         /** scaleHeight inherited */
1730         /** getImageSize inherited */
1731
1732         /**
1733          * Get the URL of the file description page.
1734          * @return string
1735          */
1736         function getDescriptionUrl() {
1737                 return $this->title->getLocalURL();
1738         }
1739
1740         /**
1741          * Get the HTML text of the description page
1742          * This is not used by ImagePage for local files, since (among other things)
1743          * it skips the parser cache.
1744          *
1745          * @param Language $lang What language to get description in (Optional)
1746          * @return bool|mixed
1747          */
1748         function getDescriptionText( $lang = null ) {
1749                 $revision = Revision::newFromTitle( $this->title, false, Revision::READ_NORMAL );
1750                 if ( !$revision ) {
1751                         return false;
1752                 }
1753                 $content = $revision->getContent();
1754                 if ( !$content ) {
1755                         return false;
1756                 }
1757                 $pout = $content->getParserOutput( $this->title, null, new ParserOptions( null, $lang ) );
1758
1759                 return $pout->getText();
1760         }
1761
1762         /**
1763          * @param int $audience
1764          * @param User $user
1765          * @return string
1766          */
1767         function getDescription( $audience = self::FOR_PUBLIC, User $user = null ) {
1768                 $this->load();
1769                 if ( $audience == self::FOR_PUBLIC && $this->isDeleted( self::DELETED_COMMENT ) ) {
1770                         return '';
1771                 } elseif ( $audience == self::FOR_THIS_USER
1772                         && !$this->userCan( self::DELETED_COMMENT, $user )
1773                 ) {
1774                         return '';
1775                 } else {
1776                         return $this->description;
1777                 }
1778         }
1779
1780         /**
1781          * @return bool|string
1782          */
1783         function getTimestamp() {
1784                 $this->load();
1785
1786                 return $this->timestamp;
1787         }
1788
1789         /**
1790          * @return string
1791          */
1792         function getSha1() {
1793                 $this->load();
1794                 // Initialise now if necessary
1795                 if ( $this->sha1 == '' && $this->fileExists ) {
1796                         $this->lock(); // begin
1797
1798                         $this->sha1 = $this->repo->getFileSha1( $this->getPath() );
1799                         if ( !wfReadOnly() && strval( $this->sha1 ) != '' ) {
1800                                 $dbw = $this->repo->getMasterDB();
1801                                 $dbw->update( 'image',
1802                                         array( 'img_sha1' => $this->sha1 ),
1803                                         array( 'img_name' => $this->getName() ),
1804                                         __METHOD__ );
1805                                 $this->saveToCache();
1806                         }
1807
1808                         $this->unlock(); // done
1809                 }
1810
1811                 return $this->sha1;
1812         }
1813
1814         /**
1815          * @return bool Whether to cache in RepoGroup (this avoids OOMs)
1816          */
1817         function isCacheable() {
1818                 $this->load();
1819
1820                 // If extra data (metadata) was not loaded then it must have been large
1821                 return $this->extraDataLoaded
1822                 && strlen( serialize( $this->metadata ) ) <= self::CACHE_FIELD_MAX_LEN;
1823         }
1824
1825         /**
1826          * Start a transaction and lock the image for update
1827          * Increments a reference counter if the lock is already held
1828          * @throws MWException
1829          * @return bool True if the image exists, false otherwise
1830          */
1831         function lock() {
1832                 $dbw = $this->repo->getMasterDB();
1833
1834                 if ( !$this->locked ) {
1835                         if ( !$dbw->trxLevel() ) {
1836                                 $dbw->begin( __METHOD__ );
1837                                 $this->lockedOwnTrx = true;
1838                         }
1839                         $this->locked++;
1840                         // Bug 54736: use simple lock to handle when the file does not exist.
1841                         // SELECT FOR UPDATE only locks records not the gaps where there are none.
1842                         $cache = wfGetMainCache();
1843                         $key = $this->getCacheKey();
1844                         if ( !$cache->lock( $key, 5 ) ) {
1845                                 throw new MWException( "Could not acquire lock for '{$this->getName()}.'" );
1846                         }
1847                         $dbw->onTransactionIdle( function () use ( $cache, $key ) {
1848                                 $cache->unlock( $key ); // release on commit
1849                         } );
1850                 }
1851
1852                 $this->markVolatile(); // file may change soon
1853
1854                 return $dbw->selectField( 'image', '1',
1855                         array( 'img_name' => $this->getName() ), __METHOD__, array( 'FOR UPDATE' ) );
1856         }
1857
1858         /**
1859          * Decrement the lock reference count. If the reference count is reduced to zero, commits
1860          * the transaction and thereby releases the image lock.
1861          */
1862         function unlock() {
1863                 if ( $this->locked ) {
1864                         --$this->locked;
1865                         if ( !$this->locked && $this->lockedOwnTrx ) {
1866                                 $dbw = $this->repo->getMasterDB();
1867                                 $dbw->commit( __METHOD__ );
1868                                 $this->lockedOwnTrx = false;
1869                         }
1870                 }
1871         }
1872
1873         /**
1874          * Mark a file as about to be changed
1875          *
1876          * This sets a cache key that alters master/slave DB loading behavior
1877          *
1878          * @return bool Success
1879          */
1880         protected function markVolatile() {
1881                 global $wgMemc;
1882
1883                 $key = $this->repo->getSharedCacheKey( 'file-volatile', md5( $this->getName() ) );
1884                 if ( $key ) {
1885                         $this->lastMarkedVolatile = time();
1886                         return $wgMemc->set( $key, $this->lastMarkedVolatile, self::VOLATILE_TTL );
1887                 }
1888
1889                 return true;
1890         }
1891
1892         /**
1893          * Check if a file is about to be changed or has been changed recently
1894          *
1895          * @see LocalFile::isVolatile()
1896          * @return bool Whether the file is volatile
1897          */
1898         protected function isVolatile() {
1899                 global $wgMemc;
1900
1901                 $key = $this->repo->getSharedCacheKey( 'file-volatile', md5( $this->getName() ) );
1902                 if ( !$key ) {
1903                         // repo unavailable; bail.
1904                         return false;
1905                 }
1906
1907                 if ( $this->lastMarkedVolatile === 0 ) {
1908                         $this->lastMarkedVolatile = $wgMemc->get( $key ) ?: 0;
1909                 }
1910
1911                 $volatileDuration = time() - $this->lastMarkedVolatile;
1912                 return $volatileDuration <= self::VOLATILE_TTL;
1913         }
1914
1915         /**
1916          * Roll back the DB transaction and mark the image unlocked
1917          */
1918         function unlockAndRollback() {
1919                 $this->locked = false;
1920                 $dbw = $this->repo->getMasterDB();
1921                 $dbw->rollback( __METHOD__ );
1922                 $this->lockedOwnTrx = false;
1923         }
1924
1925         /**
1926          * @return Status
1927          */
1928         protected function readOnlyFatalStatus() {
1929                 return $this->getRepo()->newFatal( 'filereadonlyerror', $this->getName(),
1930                         $this->getRepo()->getName(), $this->getRepo()->getReadOnlyReason() );
1931         }
1932
1933         /**
1934          * Clean up any dangling locks
1935          */
1936         function __destruct() {
1937                 $this->unlock();
1938         }
1939 } // LocalFile class
1940
1941 # ------------------------------------------------------------------------------
1942
1943 /**
1944  * Helper class for file deletion
1945  * @ingroup FileAbstraction
1946  */
1947 class LocalFileDeleteBatch {
1948         /** @var LocalFile */
1949         private $file;
1950
1951         /** @var string */
1952         private $reason;
1953
1954         /** @var array */
1955         private $srcRels = array();
1956
1957         /** @var array */
1958         private $archiveUrls = array();
1959
1960         /** @var array Items to be processed in the deletion batch */
1961         private $deletionBatch;
1962
1963         /** @var bool Wether to suppress all suppressable fields when deleting */
1964         private $suppress;
1965
1966         /** @var FileRepoStatus */
1967         private $status;
1968
1969         /** @var User */
1970         private $user;
1971
1972         /**
1973          * @param File $file
1974          * @param string $reason
1975          * @param bool $suppress
1976          * @param User|null $user
1977          */
1978         function __construct( File $file, $reason = '', $suppress = false, $user = null ) {
1979                 $this->file = $file;
1980                 $this->reason = $reason;
1981                 $this->suppress = $suppress;
1982                 if ( $user ) {
1983                         $this->user = $user;
1984                 } else {
1985                         global $wgUser;
1986                         $this->user = $wgUser;
1987                 }
1988                 $this->status = $file->repo->newGood();
1989         }
1990
1991         function addCurrent() {
1992                 $this->srcRels['.'] = $this->file->getRel();
1993         }
1994
1995         /**
1996          * @param string $oldName
1997          */
1998         function addOld( $oldName ) {
1999                 $this->srcRels[$oldName] = $this->file->getArchiveRel( $oldName );
2000                 $this->archiveUrls[] = $this->file->getArchiveUrl( $oldName );
2001         }
2002
2003         /**
2004          * Add the old versions of the image to the batch
2005          * @return array List of archive names from old versions
2006          */
2007         function addOlds() {
2008                 $archiveNames = array();
2009
2010                 $dbw = $this->file->repo->getMasterDB();
2011                 $result = $dbw->select( 'oldimage',
2012                         array( 'oi_archive_name' ),
2013                         array( 'oi_name' => $this->file->getName() ),
2014                         __METHOD__
2015                 );
2016
2017                 foreach ( $result as $row ) {
2018                         $this->addOld( $row->oi_archive_name );
2019                         $archiveNames[] = $row->oi_archive_name;
2020                 }
2021
2022                 return $archiveNames;
2023         }
2024
2025         /**
2026          * @return array
2027          */
2028         function getOldRels() {
2029                 if ( !isset( $this->srcRels['.'] ) ) {
2030                         $oldRels =& $this->srcRels;
2031                         $deleteCurrent = false;
2032                 } else {
2033                         $oldRels = $this->srcRels;
2034                         unset( $oldRels['.'] );
2035                         $deleteCurrent = true;
2036                 }
2037
2038                 return array( $oldRels, $deleteCurrent );
2039         }
2040
2041         /**
2042          * @return array
2043          */
2044         protected function getHashes() {
2045                 $hashes = array();
2046                 list( $oldRels, $deleteCurrent ) = $this->getOldRels();
2047
2048                 if ( $deleteCurrent ) {
2049                         $hashes['.'] = $this->file->getSha1();
2050                 }
2051
2052                 if ( count( $oldRels ) ) {
2053                         $dbw = $this->file->repo->getMasterDB();
2054                         $res = $dbw->select(
2055                                 'oldimage',
2056                                 array( 'oi_archive_name', 'oi_sha1' ),
2057                                 array( 'oi_archive_name' => array_keys( $oldRels ),
2058                                         'oi_name' => $this->file->getName() ), // performance
2059                                 __METHOD__
2060                         );
2061
2062                         foreach ( $res as $row ) {
2063                                 if ( rtrim( $row->oi_sha1, "\0" ) === '' ) {
2064                                         // Get the hash from the file
2065                                         $oldUrl = $this->file->getArchiveVirtualUrl( $row->oi_archive_name );
2066                                         $props = $this->file->repo->getFileProps( $oldUrl );
2067
2068                                         if ( $props['fileExists'] ) {
2069                                                 // Upgrade the oldimage row
2070                                                 $dbw->update( 'oldimage',
2071                                                         array( 'oi_sha1' => $props['sha1'] ),
2072                                                         array( 'oi_name' => $this->file->getName(), 'oi_archive_name' => $row->oi_archive_name ),
2073                                                         __METHOD__ );
2074                                                 $hashes[$row->oi_archive_name] = $props['sha1'];
2075                                         } else {
2076                                                 $hashes[$row->oi_archive_name] = false;
2077                                         }
2078                                 } else {
2079                                         $hashes[$row->oi_archive_name] = $row->oi_sha1;
2080                                 }
2081                         }
2082                 }
2083
2084                 $missing = array_diff_key( $this->srcRels, $hashes );
2085
2086                 foreach ( $missing as $name => $rel ) {
2087                         $this->status->error( 'filedelete-old-unregistered', $name );
2088                 }
2089
2090                 foreach ( $hashes as $name => $hash ) {
2091                         if ( !$hash ) {
2092                                 $this->status->error( 'filedelete-missing', $this->srcRels[$name] );
2093                                 unset( $hashes[$name] );
2094                         }
2095                 }
2096
2097                 return $hashes;
2098         }
2099
2100         function doDBInserts() {
2101                 $dbw = $this->file->repo->getMasterDB();
2102                 $encTimestamp = $dbw->addQuotes( $dbw->timestamp() );
2103                 $encUserId = $dbw->addQuotes( $this->user->getId() );
2104                 $encReason = $dbw->addQuotes( $this->reason );
2105                 $encGroup = $dbw->addQuotes( 'deleted' );
2106                 $ext = $this->file->getExtension();
2107                 $dotExt = $ext === '' ? '' : ".$ext";
2108                 $encExt = $dbw->addQuotes( $dotExt );
2109                 list( $oldRels, $deleteCurrent ) = $this->getOldRels();
2110
2111                 // Bitfields to further suppress the content
2112                 if ( $this->suppress ) {
2113                         $bitfield = 0;
2114                         // This should be 15...
2115                         $bitfield |= Revision::DELETED_TEXT;
2116                         $bitfield |= Revision::DELETED_COMMENT;
2117                         $bitfield |= Revision::DELETED_USER;
2118                         $bitfield |= Revision::DELETED_RESTRICTED;
2119                 } else {
2120                         $bitfield = 'oi_deleted';
2121                 }
2122
2123                 if ( $deleteCurrent ) {
2124                         $concat = $dbw->buildConcat( array( "img_sha1", $encExt ) );
2125                         $where = array( 'img_name' => $this->file->getName() );
2126                         $dbw->insertSelect( 'filearchive', 'image',
2127                                 array(
2128                                         'fa_storage_group' => $encGroup,
2129                                         'fa_storage_key' => $dbw->conditional( array( 'img_sha1' => '' ), $dbw->addQuotes( '' ), $concat ),
2130                                         'fa_deleted_user' => $encUserId,
2131                                         'fa_deleted_timestamp' => $encTimestamp,
2132                                         'fa_deleted_reason' => $encReason,
2133                                         'fa_deleted' => $this->suppress ? $bitfield : 0,
2134
2135                                         'fa_name' => 'img_name',
2136                                         'fa_archive_name' => 'NULL',
2137                                         'fa_size' => 'img_size',
2138                                         'fa_width' => 'img_width',
2139                                         'fa_height' => 'img_height',
2140                                         'fa_metadata' => 'img_metadata',
2141                                         'fa_bits' => 'img_bits',
2142                                         'fa_media_type' => 'img_media_type',
2143                                         'fa_major_mime' => 'img_major_mime',
2144                                         'fa_minor_mime' => 'img_minor_mime',
2145                                         'fa_description' => 'img_description',
2146                                         'fa_user' => 'img_user',
2147                                         'fa_user_text' => 'img_user_text',
2148                                         'fa_timestamp' => 'img_timestamp',
2149                                         'fa_sha1' => 'img_sha1',
2150                                 ), $where, __METHOD__ );
2151                 }
2152
2153                 if ( count( $oldRels ) ) {
2154                         $concat = $dbw->buildConcat( array( "oi_sha1", $encExt ) );
2155                         $where = array(
2156                                 'oi_name' => $this->file->getName(),
2157                                 'oi_archive_name' => array_keys( $oldRels ) );
2158                         $dbw->insertSelect( 'filearchive', 'oldimage',
2159                                 array(
2160                                         'fa_storage_group' => $encGroup,
2161                                         'fa_storage_key' => $dbw->conditional( array( 'oi_sha1' => '' ), $dbw->addQuotes( '' ), $concat ),
2162                                         'fa_deleted_user' => $encUserId,
2163                                         'fa_deleted_timestamp' => $encTimestamp,
2164                                         'fa_deleted_reason' => $encReason,
2165                                         'fa_deleted' => $this->suppress ? $bitfield : 'oi_deleted',
2166
2167                                         'fa_name' => 'oi_name',
2168                                         'fa_archive_name' => 'oi_archive_name',
2169                                         'fa_size' => 'oi_size',
2170                                         'fa_width' => 'oi_width',
2171                                         'fa_height' => 'oi_height',
2172                                         'fa_metadata' => 'oi_metadata',
2173                                         'fa_bits' => 'oi_bits',
2174                                         'fa_media_type' => 'oi_media_type',
2175                                         'fa_major_mime' => 'oi_major_mime',
2176                                         'fa_minor_mime' => 'oi_minor_mime',
2177                                         'fa_description' => 'oi_description',
2178                                         'fa_user' => 'oi_user',
2179                                         'fa_user_text' => 'oi_user_text',
2180                                         'fa_timestamp' => 'oi_timestamp',
2181                                         'fa_sha1' => 'oi_sha1',
2182                                 ), $where, __METHOD__ );
2183                 }
2184         }
2185
2186         function doDBDeletes() {
2187                 $dbw = $this->file->repo->getMasterDB();
2188                 list( $oldRels, $deleteCurrent ) = $this->getOldRels();
2189
2190                 if ( count( $oldRels ) ) {
2191                         $dbw->delete( 'oldimage',
2192                                 array(
2193                                         'oi_name' => $this->file->getName(),
2194                                         'oi_archive_name' => array_keys( $oldRels )
2195                                 ), __METHOD__ );
2196                 }
2197
2198                 if ( $deleteCurrent ) {
2199                         $dbw->delete( 'image', array( 'img_name' => $this->file->getName() ), __METHOD__ );
2200                 }
2201         }
2202
2203         /**
2204          * Run the transaction
2205          * @return FileRepoStatus
2206          */
2207         function execute() {
2208                 wfProfileIn( __METHOD__ );
2209
2210                 $this->file->lock();
2211                 // Leave private files alone
2212                 $privateFiles = array();
2213                 list( $oldRels, ) = $this->getOldRels();
2214                 $dbw = $this->file->repo->getMasterDB();
2215
2216                 if ( !empty( $oldRels ) ) {
2217                         $res = $dbw->select( 'oldimage',
2218                                 array( 'oi_archive_name' ),
2219                                 array( 'oi_name' => $this->file->getName(),
2220                                         'oi_archive_name' => array_keys( $oldRels ),
2221                                         $dbw->bitAnd( 'oi_deleted', File::DELETED_FILE ) => File::DELETED_FILE ),
2222                                 __METHOD__ );
2223
2224                         foreach ( $res as $row ) {
2225                                 $privateFiles[$row->oi_archive_name] = 1;
2226                         }
2227                 }
2228                 // Prepare deletion batch
2229                 $hashes = $this->getHashes();
2230                 $this->deletionBatch = array();
2231                 $ext = $this->file->getExtension();
2232                 $dotExt = $ext === '' ? '' : ".$ext";
2233
2234                 foreach ( $this->srcRels as $name => $srcRel ) {
2235                         // Skip files that have no hash (missing source).
2236                         // Keep private files where they are.
2237                         if ( isset( $hashes[$name] ) && !array_key_exists( $name, $privateFiles ) ) {
2238                                 $hash = $hashes[$name];
2239                                 $key = $hash . $dotExt;
2240                                 $dstRel = $this->file->repo->getDeletedHashPath( $key ) . $key;
2241                                 $this->deletionBatch[$name] = array( $srcRel, $dstRel );
2242                         }
2243                 }
2244
2245                 // Lock the filearchive rows so that the files don't get deleted by a cleanup operation
2246                 // We acquire this lock by running the inserts now, before the file operations.
2247                 //
2248                 // This potentially has poor lock contention characteristics -- an alternative
2249                 // scheme would be to insert stub filearchive entries with no fa_name and commit
2250                 // them in a separate transaction, then run the file ops, then update the fa_name fields.
2251                 $this->doDBInserts();
2252
2253                 // Removes non-existent file from the batch, so we don't get errors.
2254                 $this->deletionBatch = $this->removeNonexistentFiles( $this->deletionBatch );
2255
2256                 // Execute the file deletion batch
2257                 $status = $this->file->repo->deleteBatch( $this->deletionBatch );
2258
2259                 if ( !$status->isGood() ) {
2260                         $this->status->merge( $status );
2261                 }
2262
2263                 if ( !$this->status->isOK() ) {
2264                         // Critical file deletion error
2265                         // Roll back inserts, release lock and abort
2266                         // TODO: delete the defunct filearchive rows if we are using a non-transactional DB
2267                         $this->file->unlockAndRollback();
2268                         wfProfileOut( __METHOD__ );
2269
2270                         return $this->status;
2271                 }
2272
2273                 // Delete image/oldimage rows
2274                 $this->doDBDeletes();
2275
2276                 // Commit and return
2277                 $this->file->unlock();
2278                 wfProfileOut( __METHOD__ );
2279
2280                 return $this->status;
2281         }
2282
2283         /**
2284          * Removes non-existent files from a deletion batch.
2285          * @param array $batch
2286          * @return array
2287          */
2288         function removeNonexistentFiles( $batch ) {
2289                 $files = $newBatch = array();
2290
2291                 foreach ( $batch as $batchItem ) {
2292                         list( $src, ) = $batchItem;
2293                         $files[$src] = $this->file->repo->getVirtualUrl( 'public' ) . '/' . rawurlencode( $src );
2294                 }
2295
2296                 $result = $this->file->repo->fileExistsBatch( $files );
2297
2298                 foreach ( $batch as $batchItem ) {
2299                         if ( $result[$batchItem[0]] ) {
2300                                 $newBatch[] = $batchItem;
2301                         }
2302                 }
2303
2304                 return $newBatch;
2305         }
2306 }
2307
2308 # ------------------------------------------------------------------------------
2309
2310 /**
2311  * Helper class for file undeletion
2312  * @ingroup FileAbstraction
2313  */
2314 class LocalFileRestoreBatch {
2315         /** @var LocalFile */
2316         private $file;
2317
2318         /** @var array List of file IDs to restore */
2319         private $cleanupBatch;
2320
2321         /** @var array List of file IDs to restore */
2322         private $ids;
2323
2324         /** @var bool Add all revisions of the file */
2325         private $all;
2326
2327         /** @var bool Wether to remove all settings for suppressed fields */
2328         private $unsuppress = false;
2329
2330         /**
2331          * @param File $file
2332          * @param bool $unsuppress
2333          */
2334         function __construct( File $file, $unsuppress = false ) {
2335                 $this->file = $file;
2336                 $this->cleanupBatch = $this->ids = array();
2337                 $this->ids = array();
2338                 $this->unsuppress = $unsuppress;
2339         }
2340
2341         /**
2342          * Add a file by ID
2343          */
2344         function addId( $fa_id ) {
2345                 $this->ids[] = $fa_id;
2346         }
2347
2348         /**
2349          * Add a whole lot of files by ID
2350          */
2351         function addIds( $ids ) {
2352                 $this->ids = array_merge( $this->ids, $ids );
2353         }
2354
2355         /**
2356          * Add all revisions of the file
2357          */
2358         function addAll() {
2359                 $this->all = true;
2360         }
2361
2362         /**
2363          * Run the transaction, except the cleanup batch.
2364          * The cleanup batch should be run in a separate transaction, because it locks different
2365          * rows and there's no need to keep the image row locked while it's acquiring those locks
2366          * The caller may have its own transaction open.
2367          * So we save the batch and let the caller call cleanup()
2368          * @return FileRepoStatus
2369          */
2370         function execute() {
2371                 global $wgLang;
2372
2373                 if ( !$this->all && !$this->ids ) {
2374                         // Do nothing
2375                         return $this->file->repo->newGood();
2376                 }
2377
2378                 $exists = $this->file->lock();
2379                 $dbw = $this->file->repo->getMasterDB();
2380                 $status = $this->file->repo->newGood();
2381
2382                 // Fetch all or selected archived revisions for the file,
2383                 // sorted from the most recent to the oldest.
2384                 $conditions = array( 'fa_name' => $this->file->getName() );
2385
2386                 if ( !$this->all ) {
2387                         $conditions['fa_id'] = $this->ids;
2388                 }
2389
2390                 $result = $dbw->select(
2391                         'filearchive',
2392                         ArchivedFile::selectFields(),
2393                         $conditions,
2394                         __METHOD__,
2395                         array( 'ORDER BY' => 'fa_timestamp DESC' )
2396                 );
2397
2398                 $idsPresent = array();
2399                 $storeBatch = array();
2400                 $insertBatch = array();
2401                 $insertCurrent = false;
2402                 $deleteIds = array();
2403                 $first = true;
2404                 $archiveNames = array();
2405
2406                 foreach ( $result as $row ) {
2407                         $idsPresent[] = $row->fa_id;
2408
2409                         if ( $row->fa_name != $this->file->getName() ) {
2410                                 $status->error( 'undelete-filename-mismatch', $wgLang->timeanddate( $row->fa_timestamp ) );
2411                                 $status->failCount++;
2412                                 continue;
2413                         }
2414
2415                         if ( $row->fa_storage_key == '' ) {
2416                                 // Revision was missing pre-deletion
2417                                 $status->error( 'undelete-bad-store-key', $wgLang->timeanddate( $row->fa_timestamp ) );
2418                                 $status->failCount++;
2419                                 continue;
2420                         }
2421
2422                         $deletedRel = $this->file->repo->getDeletedHashPath( $row->fa_storage_key ) .
2423                                 $row->fa_storage_key;
2424                         $deletedUrl = $this->file->repo->getVirtualUrl() . '/deleted/' . $deletedRel;
2425
2426                         if ( isset( $row->fa_sha1 ) ) {
2427                                 $sha1 = $row->fa_sha1;
2428                         } else {
2429                                 // old row, populate from key
2430                                 $sha1 = LocalRepo::getHashFromKey( $row->fa_storage_key );
2431                         }
2432
2433                         # Fix leading zero
2434                         if ( strlen( $sha1 ) == 32 && $sha1[0] == '0' ) {
2435                                 $sha1 = substr( $sha1, 1 );
2436                         }
2437
2438                         if ( is_null( $row->fa_major_mime ) || $row->fa_major_mime == 'unknown'
2439                                 || is_null( $row->fa_minor_mime ) || $row->fa_minor_mime == 'unknown'
2440                                 || is_null( $row->fa_media_type ) || $row->fa_media_type == 'UNKNOWN'
2441                                 || is_null( $row->fa_metadata )
2442                         ) {
2443                                 // Refresh our metadata
2444                                 // Required for a new current revision; nice for older ones too. :)
2445                                 $props = RepoGroup::singleton()->getFileProps( $deletedUrl );
2446                         } else {
2447                                 $props = array(
2448                                         'minor_mime' => $row->fa_minor_mime,
2449                                         'major_mime' => $row->fa_major_mime,
2450                                         'media_type' => $row->fa_media_type,
2451                                         'metadata' => $row->fa_metadata
2452                                 );
2453                         }
2454
2455                         if ( $first && !$exists ) {
2456                                 // This revision will be published as the new current version
2457                                 $destRel = $this->file->getRel();
2458                                 $insertCurrent = array(
2459                                         'img_name' => $row->fa_name,
2460                                         'img_size' => $row->fa_size,
2461                                         'img_width' => $row->fa_width,
2462                                         'img_height' => $row->fa_height,
2463                                         'img_metadata' => $props['metadata'],
2464                                         'img_bits' => $row->fa_bits,
2465                                         'img_media_type' => $props['media_type'],
2466                                         'img_major_mime' => $props['major_mime'],
2467                                         'img_minor_mime' => $props['minor_mime'],
2468                                         'img_description' => $row->fa_description,
2469                                         'img_user' => $row->fa_user,
2470                                         'img_user_text' => $row->fa_user_text,
2471                                         'img_timestamp' => $row->fa_timestamp,
2472                                         'img_sha1' => $sha1
2473                                 );
2474
2475                                 // The live (current) version cannot be hidden!
2476                                 if ( !$this->unsuppress && $row->fa_deleted ) {
2477                                         $storeBatch[] = array( $deletedUrl, 'public', $destRel );
2478                                         $this->cleanupBatch[] = $row->fa_storage_key;
2479                                 }
2480                         } else {
2481                                 $archiveName = $row->fa_archive_name;
2482
2483                                 if ( $archiveName == '' ) {
2484                                         // This was originally a current version; we
2485                                         // have to devise a new archive name for it.
2486                                         // Format is <timestamp of archiving>!<name>
2487                                         $timestamp = wfTimestamp( TS_UNIX, $row->fa_deleted_timestamp );
2488
2489                                         do {
2490                                                 $archiveName = wfTimestamp( TS_MW, $timestamp ) . '!' . $row->fa_name;
2491                                                 $timestamp++;
2492                                         } while ( isset( $archiveNames[$archiveName] ) );
2493                                 }
2494
2495                                 $archiveNames[$archiveName] = true;
2496                                 $destRel = $this->file->getArchiveRel( $archiveName );
2497                                 $insertBatch[] = array(
2498                                         'oi_name' => $row->fa_name,
2499                                         'oi_archive_name' => $archiveName,
2500                                         'oi_size' => $row->fa_size,
2501                                         'oi_width' => $row->fa_width,
2502                                         'oi_height' => $row->fa_height,
2503                                         'oi_bits' => $row->fa_bits,
2504                                         'oi_description' => $row->fa_description,
2505                                         'oi_user' => $row->fa_user,
2506                                         'oi_user_text' => $row->fa_user_text,
2507                                         'oi_timestamp' => $row->fa_timestamp,
2508                                         'oi_metadata' => $props['metadata'],
2509                                         'oi_media_type' => $props['media_type'],
2510                                         'oi_major_mime' => $props['major_mime'],
2511                                         'oi_minor_mime' => $props['minor_mime'],
2512                                         'oi_deleted' => $this->unsuppress ? 0 : $row->fa_deleted,
2513                                         'oi_sha1' => $sha1 );
2514                         }
2515
2516                         $deleteIds[] = $row->fa_id;
2517
2518                         if ( !$this->unsuppress && $row->fa_deleted & File::DELETED_FILE ) {
2519                                 // private files can stay where they are
2520                                 $status->successCount++;
2521                         } else {
2522                                 $storeBatch[] = array( $deletedUrl, 'public', $destRel );
2523                                 $this->cleanupBatch[] = $row->fa_storage_key;
2524                         }
2525
2526                         $first = false;
2527                 }
2528
2529                 unset( $result );
2530
2531                 // Add a warning to the status object for missing IDs
2532                 $missingIds = array_diff( $this->ids, $idsPresent );
2533
2534                 foreach ( $missingIds as $id ) {
2535                         $status->error( 'undelete-missing-filearchive', $id );
2536                 }
2537
2538                 // Remove missing files from batch, so we don't get errors when undeleting them
2539                 $storeBatch = $this->removeNonexistentFiles( $storeBatch );
2540
2541                 // Run the store batch
2542                 // Use the OVERWRITE_SAME flag to smooth over a common error
2543                 $storeStatus = $this->file->repo->storeBatch( $storeBatch, FileRepo::OVERWRITE_SAME );
2544                 $status->merge( $storeStatus );
2545
2546                 if ( !$status->isGood() ) {
2547                         // Even if some files could be copied, fail entirely as that is the
2548                         // easiest thing to do without data loss
2549                         $this->cleanupFailedBatch( $storeStatus, $storeBatch );
2550                         $status->ok = false;
2551                         $this->file->unlock();
2552
2553                         return $status;
2554                 }
2555
2556                 // Run the DB updates
2557                 // Because we have locked the image row, key conflicts should be rare.
2558                 // If they do occur, we can roll back the transaction at this time with
2559                 // no data loss, but leaving unregistered files scattered throughout the
2560                 // public zone.
2561                 // This is not ideal, which is why it's important to lock the image row.
2562                 if ( $insertCurrent ) {
2563                         $dbw->insert( 'image', $insertCurrent, __METHOD__ );
2564                 }
2565
2566                 if ( $insertBatch ) {
2567                         $dbw->insert( 'oldimage', $insertBatch, __METHOD__ );
2568                 }
2569
2570                 if ( $deleteIds ) {
2571                         $dbw->delete( 'filearchive',
2572                                 array( 'fa_id' => $deleteIds ),
2573                                 __METHOD__ );
2574                 }
2575
2576                 // If store batch is empty (all files are missing), deletion is to be considered successful
2577                 if ( $status->successCount > 0 || !$storeBatch ) {
2578                         if ( !$exists ) {
2579                                 wfDebug( __METHOD__ . " restored {$status->successCount} items, creating a new current\n" );
2580
2581                                 DeferredUpdates::addUpdate( SiteStatsUpdate::factory( array( 'images' => 1 ) ) );
2582
2583                                 $this->file->purgeEverything();
2584                         } else {
2585                                 wfDebug( __METHOD__ . " restored {$status->successCount} as archived versions\n" );
2586                                 $this->file->purgeDescription();
2587                                 $this->file->purgeHistory();
2588                         }
2589                 }
2590
2591                 $this->file->unlock();
2592
2593                 return $status;
2594         }
2595
2596         /**
2597          * Removes non-existent files from a store batch.
2598          * @param array $triplets
2599          * @return array
2600          */
2601         function removeNonexistentFiles( $triplets ) {
2602                 $files = $filteredTriplets = array();
2603                 foreach ( $triplets as $file ) {
2604                         $files[$file[0]] = $file[0];
2605                 }
2606
2607                 $result = $this->file->repo->fileExistsBatch( $files );
2608
2609                 foreach ( $triplets as $file ) {
2610                         if ( $result[$file[0]] ) {
2611                                 $filteredTriplets[] = $file;
2612                         }
2613                 }
2614
2615                 return $filteredTriplets;
2616         }
2617
2618         /**
2619          * Removes non-existent files from a cleanup batch.
2620          * @param array $batch
2621          * @return array
2622          */
2623         function removeNonexistentFromCleanup( $batch ) {
2624                 $files = $newBatch = array();
2625                 $repo = $this->file->repo;
2626
2627                 foreach ( $batch as $file ) {
2628                         $files[$file] = $repo->getVirtualUrl( 'deleted' ) . '/' .
2629                                 rawurlencode( $repo->getDeletedHashPath( $file ) . $file );
2630                 }
2631
2632                 $result = $repo->fileExistsBatch( $files );
2633
2634                 foreach ( $batch as $file ) {
2635                         if ( $result[$file] ) {
2636                                 $newBatch[] = $file;
2637                         }
2638                 }
2639
2640                 return $newBatch;
2641         }
2642
2643         /**
2644          * Delete unused files in the deleted zone.
2645          * This should be called from outside the transaction in which execute() was called.
2646          * @return FileRepoStatus
2647          */
2648         function cleanup() {
2649                 if ( !$this->cleanupBatch ) {
2650                         return $this->file->repo->newGood();
2651                 }
2652
2653                 $this->cleanupBatch = $this->removeNonexistentFromCleanup( $this->cleanupBatch );
2654
2655                 $status = $this->file->repo->cleanupDeletedBatch( $this->cleanupBatch );
2656
2657                 return $status;
2658         }
2659
2660         /**
2661          * Cleanup a failed batch. The batch was only partially successful, so
2662          * rollback by removing all items that were succesfully copied.
2663          *
2664          * @param Status $storeStatus
2665          * @param array $storeBatch
2666          */
2667         function cleanupFailedBatch( $storeStatus, $storeBatch ) {
2668                 $cleanupBatch = array();
2669
2670                 foreach ( $storeStatus->success as $i => $success ) {
2671                         // Check if this item of the batch was successfully copied
2672                         if ( $success ) {
2673                                 // Item was successfully copied and needs to be removed again
2674                                 // Extract ($dstZone, $dstRel) from the batch
2675                                 $cleanupBatch[] = array( $storeBatch[$i][1], $storeBatch[$i][2] );
2676                         }
2677                 }
2678                 $this->file->repo->cleanupBatch( $cleanupBatch );
2679         }
2680 }
2681
2682 # ------------------------------------------------------------------------------
2683
2684 /**
2685  * Helper class for file movement
2686  * @ingroup FileAbstraction
2687  */
2688 class LocalFileMoveBatch {
2689         /** @var LocalFile */
2690         protected $file;
2691
2692         /** @var Title */
2693         protected $target;
2694
2695         protected $cur;
2696
2697         protected $olds;
2698
2699         protected $oldCount;
2700
2701         protected $archive;
2702
2703         /** @var DatabaseBase */
2704         protected $db;
2705
2706         /**
2707          * @param File $file
2708          * @param Title $target
2709          */
2710         function __construct( File $file, Title $target ) {
2711                 $this->file = $file;
2712                 $this->target = $target;
2713                 $this->oldHash = $this->file->repo->getHashPath( $this->file->getName() );
2714                 $this->newHash = $this->file->repo->getHashPath( $this->target->getDBkey() );
2715                 $this->oldName = $this->file->getName();
2716                 $this->newName = $this->file->repo->getNameFromTitle( $this->target );
2717                 $this->oldRel = $this->oldHash . $this->oldName;
2718                 $this->newRel = $this->newHash . $this->newName;
2719                 $this->db = $file->getRepo()->getMasterDb();
2720         }
2721
2722         /**
2723          * Add the current image to the batch
2724          */
2725         function addCurrent() {
2726                 $this->cur = array( $this->oldRel, $this->newRel );
2727         }
2728
2729         /**
2730          * Add the old versions of the image to the batch
2731          * @return array List of archive names from old versions
2732          */
2733         function addOlds() {
2734                 $archiveBase = 'archive';
2735                 $this->olds = array();
2736                 $this->oldCount = 0;
2737                 $archiveNames = array();
2738
2739                 $result = $this->db->select( 'oldimage',
2740                         array( 'oi_archive_name', 'oi_deleted' ),
2741                         array( 'oi_name' => $this->oldName ),
2742                         __METHOD__
2743                 );
2744
2745                 foreach ( $result as $row ) {
2746                         $archiveNames[] = $row->oi_archive_name;
2747                         $oldName = $row->oi_archive_name;
2748                         $bits = explode( '!', $oldName, 2 );
2749
2750                         if ( count( $bits ) != 2 ) {
2751                                 wfDebug( "Old file name missing !: '$oldName' \n" );
2752                                 continue;
2753                         }
2754
2755                         list( $timestamp, $filename ) = $bits;
2756
2757                         if ( $this->oldName != $filename ) {
2758                                 wfDebug( "Old file name doesn't match: '$oldName' \n" );
2759                                 continue;
2760                         }
2761
2762                         $this->oldCount++;
2763
2764                         // Do we want to add those to oldCount?
2765                         if ( $row->oi_deleted & File::DELETED_FILE ) {
2766                                 continue;
2767                         }
2768
2769                         $this->olds[] = array(
2770                                 "{$archiveBase}/{$this->oldHash}{$oldName}",
2771                                 "{$archiveBase}/{$this->newHash}{$timestamp}!{$this->newName}"
2772                         );
2773                 }
2774
2775                 return $archiveNames;
2776         }
2777
2778         /**
2779          * Perform the move.
2780          * @return FileRepoStatus
2781          */
2782         function execute() {
2783                 $repo = $this->file->repo;
2784                 $status = $repo->newGood();
2785
2786                 $triplets = $this->getMoveTriplets();
2787                 $triplets = $this->removeNonexistentFiles( $triplets );
2788                 $destFile = wfLocalFile( $this->target );
2789
2790                 $this->file->lock(); // begin
2791                 $destFile->lock(); // quickly fail if destination is not available
2792                 // Rename the file versions metadata in the DB.
2793                 // This implicitly locks the destination file, which avoids race conditions.
2794                 // If we moved the files from A -> C before DB updates, another process could
2795                 // move files from B -> C at this point, causing storeBatch() to fail and thus
2796                 // cleanupTarget() to trigger. It would delete the C files and cause data loss.
2797                 $statusDb = $this->doDBUpdates();
2798                 if ( !$statusDb->isGood() ) {
2799                         $this->file->unlockAndRollback();
2800                         $statusDb->ok = false;
2801
2802                         return $statusDb;
2803                 }
2804                 wfDebugLog( 'imagemove', "Renamed {$this->file->getName()} in database: " .
2805                         "{$statusDb->successCount} successes, {$statusDb->failCount} failures" );
2806
2807                 // Copy the files into their new location.
2808                 // If a prior process fataled copying or cleaning up files we tolerate any
2809                 // of the existing files if they are identical to the ones being stored.
2810                 $statusMove = $repo->storeBatch( $triplets, FileRepo::OVERWRITE_SAME );
2811                 wfDebugLog( 'imagemove', "Moved files for {$this->file->getName()}: " .
2812                         "{$statusMove->successCount} successes, {$statusMove->failCount} failures" );
2813                 if ( !$statusMove->isGood() ) {
2814                         // Delete any files copied over (while the destination is still locked)
2815                         $this->cleanupTarget( $triplets );
2816                         $this->file->unlockAndRollback(); // unlocks the destination
2817                         wfDebugLog( 'imagemove', "Error in moving files: " . $statusMove->getWikiText() );
2818                         $statusMove->ok = false;
2819
2820                         return $statusMove;
2821                 }
2822                 $destFile->unlock();
2823                 $this->file->unlock(); // done
2824
2825                 // Everything went ok, remove the source files
2826                 $this->cleanupSource( $triplets );
2827
2828                 $status->merge( $statusDb );
2829                 $status->merge( $statusMove );
2830
2831                 return $status;
2832         }
2833
2834         /**
2835          * Do the database updates and return a new FileRepoStatus indicating how
2836          * many rows where updated.
2837          *
2838          * @return FileRepoStatus
2839          */
2840         function doDBUpdates() {
2841                 $repo = $this->file->repo;
2842                 $status = $repo->newGood();
2843                 $dbw = $this->db;
2844
2845                 // Update current image
2846                 $dbw->update(
2847                         'image',
2848                         array( 'img_name' => $this->newName ),
2849                         array( 'img_name' => $this->oldName ),
2850                         __METHOD__
2851                 );
2852
2853                 if ( $dbw->affectedRows() ) {
2854                         $status->successCount++;
2855                 } else {
2856                         $status->failCount++;
2857                         $status->fatal( 'imageinvalidfilename' );
2858
2859                         return $status;
2860                 }
2861
2862                 // Update old images
2863                 $dbw->update(
2864                         'oldimage',
2865                         array(
2866                                 'oi_name' => $this->newName,
2867                                 'oi_archive_name = ' . $dbw->strreplace( 'oi_archive_name',
2868                                         $dbw->addQuotes( $this->oldName ), $dbw->addQuotes( $this->newName ) ),
2869                         ),
2870                         array( 'oi_name' => $this->oldName ),
2871                         __METHOD__
2872                 );
2873
2874                 $affected = $dbw->affectedRows();
2875                 $total = $this->oldCount;
2876                 $status->successCount += $affected;
2877                 // Bug 34934: $total is based on files that actually exist.
2878                 // There may be more DB rows than such files, in which case $affected
2879                 // can be greater than $total. We use max() to avoid negatives here.
2880                 $status->failCount += max( 0, $total - $affected );
2881                 if ( $status->failCount ) {
2882                         $status->error( 'imageinvalidfilename' );
2883                 }
2884
2885                 return $status;
2886         }
2887
2888         /**
2889          * Generate triplets for FileRepo::storeBatch().
2890          * @return array
2891          */
2892         function getMoveTriplets() {
2893                 $moves = array_merge( array( $this->cur ), $this->olds );
2894                 $triplets = array(); // The format is: (srcUrl, destZone, destUrl)
2895
2896                 foreach ( $moves as $move ) {
2897                         // $move: (oldRelativePath, newRelativePath)
2898                         $srcUrl = $this->file->repo->getVirtualUrl() . '/public/' . rawurlencode( $move[0] );
2899                         $triplets[] = array( $srcUrl, 'public', $move[1] );
2900                         wfDebugLog(
2901                                 'imagemove',
2902                                 "Generated move triplet for {$this->file->getName()}: {$srcUrl} :: public :: {$move[1]}"
2903                         );
2904                 }
2905
2906                 return $triplets;
2907         }
2908
2909         /**
2910          * Removes non-existent files from move batch.
2911          * @param array $triplets
2912          * @return array
2913          */
2914         function removeNonexistentFiles( $triplets ) {
2915                 $files = array();
2916
2917                 foreach ( $triplets as $file ) {
2918                         $files[$file[0]] = $file[0];
2919                 }
2920
2921                 $result = $this->file->repo->fileExistsBatch( $files );
2922                 $filteredTriplets = array();
2923
2924                 foreach ( $triplets as $file ) {
2925                         if ( $result[$file[0]] ) {
2926                                 $filteredTriplets[] = $file;
2927                         } else {
2928                                 wfDebugLog( 'imagemove', "File {$file[0]} does not exist" );
2929                         }
2930                 }
2931
2932                 return $filteredTriplets;
2933         }
2934
2935         /**
2936          * Cleanup a partially moved array of triplets by deleting the target
2937          * files. Called if something went wrong half way.
2938          */
2939         function cleanupTarget( $triplets ) {
2940                 // Create dest pairs from the triplets
2941                 $pairs = array();
2942                 foreach ( $triplets as $triplet ) {
2943                         // $triplet: (old source virtual URL, dst zone, dest rel)
2944                         $pairs[] = array( $triplet[1], $triplet[2] );
2945                 }
2946
2947                 $this->file->repo->cleanupBatch( $pairs );
2948         }
2949
2950         /**
2951          * Cleanup a fully moved array of triplets by deleting the source files.
2952          * Called at the end of the move process if everything else went ok.
2953          */
2954         function cleanupSource( $triplets ) {
2955                 // Create source file names from the triplets
2956                 $files = array();
2957                 foreach ( $triplets as $triplet ) {
2958                         $files[] = $triplet[0];
2959                 }
2960
2961                 $this->file->repo->cleanupBatch( $files );
2962         }
2963 }