includes/Image.php

   1 <?php
   2 /**
   3  */
   4
   5 /**
   6  * NOTE FOR WINDOWS USERS:
   7  * To enable EXIF functions, add the folloing lines to the
   8  * "Windows extensions" section of php.ini:
   9  *
  10  * extension=extensions/php_mbstring.dll
  11  * extension=extensions/php_exif.dll
  12  */
  13
  14 /**
  15  * Bump this number when serialized cache records may be incompatible.
  16  */
  17 define( 'MW_IMAGE_VERSION', 2 );
  18
  19 /**
  20  * Class to represent an image
  21  *
  22  * Provides methods to retrieve paths (physical, logical, URL),
  23  * to generate thumbnails or for uploading.
  24  *
  25  * @addtogroup Media
  26  */
  27 class Image
  28 {
  29         const DELETED_FILE = 1;
  30         const DELETED_COMMENT = 2;
  31         const DELETED_USER = 4;
  32         const DELETED_RESTRICTED = 8;
  33         const RENDER_NOW = 1;
  34
  35         /**#@+
  36          * @private
  37          */
  38         var     $name,          # name of the image (constructor)
  39                 $imagePath,     # Path of the image (loadFromXxx)
  40                 $url,           # Image URL (accessor)
  41                 $title,         # Title object for this image (constructor)
  42                 $fileExists,    # does the image file exist on disk? (loadFromXxx)
  43                 $fromSharedDirectory, # load this image from $wgSharedUploadDirectory (loadFromXxx)
  44                 $historyLine,   # Number of line to return by nextHistoryLine() (constructor)
  45                 $historyRes,    # result of the query for the image's history (nextHistoryLine)
  46                 $width,         # \
  47                 $height,        #  |
  48                 $bits,          #   --- returned by getimagesize (loadFromXxx)
  49                 $attr,          # /
  50                 $type,          # MEDIATYPE_xxx (bitmap, drawing, audio...)
  51                 $mime,          # MIME type, determined by MimeMagic::guessMimeType
  52                 $extension,     # The file extension (constructor)
  53                 $size,          # Size in bytes (loadFromXxx)
  54                 $metadata,      # Metadata
  55                 $dataLoaded,    # Whether or not all this has been loaded from the database (loadFromXxx)
  56                 $page,          # Page to render when creating thumbnails
  57                 $lastError;     # Error string associated with a thumbnail display error
  58
  59
  60         /**#@-*/
  61
  62         /**
  63          * Create an Image object from an image name
  64          *
  65          * @param string $name name of the image, used to create a title object using Title::makeTitleSafe
  66          * @public
  67          */
  68         public static function newFromName( $name ) {
  69                 $title = Title::makeTitleSafe( NS_IMAGE, $name );
  70                 if ( is_object( $title ) ) {
  71                         return new Image( $title );
  72                 } else {
  73                         return NULL;
  74                 }
  75         }
  76
  77         /**
  78          * Obsolete factory function, use constructor
  79          * @deprecated
  80          */
  81         function newFromTitle( $title ) {
  82                 return new Image( $title );
  83         }
  84
  85         function Image( $title ) {
  86                 if( !is_object( $title ) ) {
  87                         throw new MWException( 'Image constructor given bogus title.' );
  88                 }
  89                 $this->title =& $title;
  90                 $this->name = $title->getDBkey();
  91                 $this->metadata = '';
  92
  93                 $n = strrpos( $this->name, '.' );
  94                 $this->extension = Image::normalizeExtension( $n ?
  95                         substr( $this->name, $n + 1 ) : '' );
  96                 $this->historyLine = 0;
  97
  98                 $this->dataLoaded = false;
  99         }
 100
 101         /**
 102          * Normalize a file extension to the common form, and ensure it's clean.
 103          * Extensions with non-alphanumeric characters will be discarded.
 104          *
 105          * @param $ext string (without the .)
 106          * @return string
 107          */
 108         static function normalizeExtension( $ext ) {
 109                 $lower = strtolower( $ext );
 110                 $squish = array(
 111                         'htm' => 'html',
 112                         'jpeg' => 'jpg',
 113                         'mpeg' => 'mpg',
 114                         'tiff' => 'tif' );
 115                 if( isset( $squish[$lower] ) ) {
 116                         return $squish[$lower];
 117                 } elseif( preg_match( '/^[0-9a-z]+$/', $lower ) ) {
 118                         return $lower;
 119                 } else {
 120                         return '';
 121                 }
 122         }
 123
 124         /**
 125          * Get the memcached keys
 126          * Returns an array, first element is the local cache key, second is the shared cache key, if there is one
 127          */
 128         function getCacheKeys( ) {
 129                 global $wgUseSharedUploads, $wgSharedUploadDBname, $wgCacheSharedUploads;
 130
 131                 $hashedName = md5($this->name);
 132                 $keys = array( wfMemcKey( 'Image', $hashedName ) );
 133                 if ( $wgUseSharedUploads && $wgSharedUploadDBname && $wgCacheSharedUploads ) {
 134                         $keys[] = wfForeignMemcKey( $wgSharedUploadDBname, false, 'Image', $hashedName );
 135                 }
 136                 return $keys;
 137         }
 138
 139         /**
 140          * Try to load image metadata from memcached. Returns true on success.
 141          */
 142         function loadFromCache() {
 143                 global $wgUseSharedUploads, $wgMemc;
 144                 wfProfileIn( __METHOD__ );
 145                 $this->dataLoaded = false;
 146                 $keys = $this->getCacheKeys();
 147                 $cachedValues = $wgMemc->get( $keys[0] );
 148
 149                 // Check if the key existed and belongs to this version of MediaWiki
 150                 if (!empty($cachedValues) && is_array($cachedValues)
 151                   && isset($cachedValues['version']) && ( $cachedValues['version'] == MW_IMAGE_VERSION )
 152                   && isset( $cachedValues['mime'] ) && isset( $cachedValues['metadata'] ) )
 153                 {
 154                         if ( $wgUseSharedUploads && $cachedValues['fromShared']) {
 155                                 # if this is shared file, we need to check if image
 156                                 # in shared repository has not changed
 157                                 if ( isset( $keys[1] ) ) {
 158                                         $commonsCachedValues = $wgMemc->get( $keys[1] );
 159                                         if (!empty($commonsCachedValues) && is_array($commonsCachedValues)
 160                                           && isset($commonsCachedValues['version'])
 161                                           && ( $commonsCachedValues['version'] == MW_IMAGE_VERSION )
 162                                           && isset($commonsCachedValues['mime'])) {
 163                                                 wfDebug( "Pulling image metadata from shared repository cache\n" );
 164                                                 $this->name = $commonsCachedValues['name'];
 165                                                 $this->imagePath = $commonsCachedValues['imagePath'];
 166                                                 $this->fileExists = $commonsCachedValues['fileExists'];
 167                                                 $this->width = $commonsCachedValues['width'];
 168                                                 $this->height = $commonsCachedValues['height'];
 169                                                 $this->bits = $commonsCachedValues['bits'];
 170                                                 $this->type = $commonsCachedValues['type'];
 171                                                 $this->mime = $commonsCachedValues['mime'];
 172                                                 $this->metadata = $commonsCachedValues['metadata'];
 173                                                 $this->size = $commonsCachedValues['size'];
 174                                                 $this->fromSharedDirectory = true;
 175                                                 $this->dataLoaded = true;
 176                                                 $this->imagePath = $this->getFullPath(true);
 177                                         }
 178                                 }
 179                         } else {
 180                                 wfDebug( "Pulling image metadata from local cache\n" );
 181                                 $this->name = $cachedValues['name'];
 182                                 $this->imagePath = $cachedValues['imagePath'];
 183                                 $this->fileExists = $cachedValues['fileExists'];
 184                                 $this->width = $cachedValues['width'];
 185                                 $this->height = $cachedValues['height'];
 186                                 $this->bits = $cachedValues['bits'];
 187                                 $this->type = $cachedValues['type'];
 188                                 $this->mime = $cachedValues['mime'];
 189                                 $this->metadata = $cachedValues['metadata'];
 190                                 $this->size = $cachedValues['size'];
 191                                 $this->fromSharedDirectory = false;
 192                                 $this->dataLoaded = true;
 193                                 $this->imagePath = $this->getFullPath();
 194                         }
 195                 }
 196                 if ( $this->dataLoaded ) {
 197                         wfIncrStats( 'image_cache_hit' );
 198                 } else {
 199                         wfIncrStats( 'image_cache_miss' );
 200                 }
 201
 202                 wfProfileOut( __METHOD__ );
 203                 return $this->dataLoaded;
 204         }
 205
 206         /**
 207          * Save the image metadata to memcached
 208          */
 209         function saveToCache() {
 210                 global $wgMemc, $wgUseSharedUploads;
 211                 $this->load();
 212                 $keys = $this->getCacheKeys();
 213                 // We can't cache negative metadata for non-existent files,
 214                 // because if the file later appears in commons, the local
 215                 // keys won't be purged.
 216                 if ( $this->fileExists || !$wgUseSharedUploads ) {
 217                         $cachedValues = array(
 218                                 'version'    => MW_IMAGE_VERSION,
 219                                 'name'       => $this->name,
 220                                 'imagePath'  => $this->imagePath,
 221                                 'fileExists' => $this->fileExists,
 222                                 'fromShared' => $this->fromSharedDirectory,
 223                                 'width'      => $this->width,
 224                                 'height'     => $this->height,
 225                                 'bits'       => $this->bits,
 226                                 'type'       => $this->type,
 227                                 'mime'       => $this->mime,
 228                                 'metadata'   => $this->metadata,
 229                                 'size'       => $this->size );
 230
 231                         $wgMemc->set( $keys[0], $cachedValues, 60 * 60 * 24 * 7 ); // A week
 232                 } else {
 233                         // However we should clear them, so they aren't leftover
 234                         // if we've deleted the file.
 235                         $wgMemc->delete( $keys[0] );
 236                 }
 237         }
 238
 239         /**
 240          * Load metadata from the file itself
 241          */
 242         function loadFromFile() {
 243                 global $wgUseSharedUploads, $wgSharedUploadDirectory, $wgContLang;
 244                 wfProfileIn( __METHOD__ );
 245                 $this->imagePath = $this->getFullPath();
 246                 $this->fileExists = file_exists( $this->imagePath );
 247                 $this->fromSharedDirectory = false;
 248                 $gis = array();
 249
 250                 if (!$this->fileExists) wfDebug(__METHOD__.': '.$this->imagePath." not found locally!\n");
 251
 252                 # If the file is not found, and a shared upload directory is used, look for it there.
 253                 if (!$this->fileExists && $wgUseSharedUploads && $wgSharedUploadDirectory) {
 254                         # In case we're on a wgCapitalLinks=false wiki, we
 255                         # capitalize the first letter of the filename before
 256                         # looking it up in the shared repository.
 257                         $sharedImage = Image::newFromName( $wgContLang->ucfirst($this->name) );
 258                         $this->fileExists = $sharedImage && file_exists( $sharedImage->getFullPath(true) );
 259                         if ( $this->fileExists ) {
 260                                 $this->name = $sharedImage->name;
 261                                 $this->imagePath = $this->getFullPath(true);
 262                                 $this->fromSharedDirectory = true;
 263                         }
 264                 }
 265
 266
 267                 if ( $this->fileExists ) {
 268                         $magic=& MimeMagic::singleton();
 269
 270                         $this->mime = $magic->guessMimeType($this->imagePath,true);
 271                         $this->type = $magic->getMediaType($this->imagePath,$this->mime);
 272                         $handler = MediaHandler::getHandler( $this->mime );
 273
 274                         # Get size in bytes
 275                         $this->size = filesize( $this->imagePath );
 276
 277                         # Height, width and metadata
 278                         if ( $handler ) {
 279                                 $gis = $handler->getImageSize( $this, $this->imagePath );
 280                                 $this->metadata = $handler->getMetadata( $this, $this->imagePath );
 281                         } else {
 282                                 $gis = false;
 283                                 $this->metadata = '';
 284                         }
 285
 286                         wfDebug(__METHOD__.': '.$this->imagePath." loaded, ".$this->size." bytes, ".$this->mime.".\n");
 287                 }
 288                 else {
 289                         $this->mime = NULL;
 290                         $this->type = MEDIATYPE_UNKNOWN;
 291                         $this->metadata = '';
 292                         wfDebug(__METHOD__.': '.$this->imagePath." NOT FOUND!\n");
 293                 }
 294
 295                 if( $gis ) {
 296                         $this->width = $gis[0];
 297                         $this->height = $gis[1];
 298                 } else {
 299                         $this->width = 0;
 300                         $this->height = 0;
 301                 }
 302
 303                 #NOTE: $gis[2] contains a code for the image type. This is no longer used.
 304
 305                 #NOTE: we have to set this flag early to avoid load() to be called
 306                 # be some of the functions below. This may lead to recursion or other bad things!
 307                 # as ther's only one thread of execution, this should be safe anyway.
 308                 $this->dataLoaded = true;
 309
 310                 if ( isset( $gis['bits'] ) )  $this->bits = $gis['bits'];
 311                 else $this->bits = 0;
 312
 313                 wfProfileOut( __METHOD__ );
 314         }
 315
 316         /**
 317          * Load image metadata from the DB
 318          */
 319         function loadFromDB() {
 320                 global $wgUseSharedUploads, $wgSharedUploadDBname, $wgSharedUploadDBprefix, $wgContLang;
 321                 wfProfileIn( __METHOD__ );
 322
 323                 $dbr = wfGetDB( DB_SLAVE );
 324                 $this->checkDBSchema($dbr);
 325
 326                 $row = $dbr->selectRow( 'image',
 327                         array( 'img_size', 'img_width', 'img_height', 'img_bits',
 328                                'img_media_type', 'img_major_mime', 'img_minor_mime', 'img_metadata' ),
 329                         array( 'img_name' => $this->name ), __METHOD__ );
 330                 if ( $row ) {
 331                         $this->fromSharedDirectory = false;
 332                         $this->fileExists = true;
 333                         $this->loadFromRow( $row );
 334                         $this->imagePath = $this->getFullPath();
 335                         // Check for rows from a previous schema, quietly upgrade them
 336                         $this->maybeUpgradeRow();
 337                 } elseif ( $wgUseSharedUploads && $wgSharedUploadDBname ) {
 338                         # In case we're on a wgCapitalLinks=false wiki, we
 339                         # capitalize the first letter of the filename before
 340                         # looking it up in the shared repository.
 341                         $name = $wgContLang->ucfirst($this->name);
 342                         $dbc = Image::getCommonsDB();
 343
 344                         $row = $dbc->selectRow( "`$wgSharedUploadDBname`.{$wgSharedUploadDBprefix}image",
 345                                 array(
 346                                         'img_size', 'img_width', 'img_height', 'img_bits',
 347                                         'img_media_type', 'img_major_mime', 'img_minor_mime', 'img_metadata' ),
 348                                 array( 'img_name' => $name ), __METHOD__ );
 349                         if ( $row ) {
 350                                 $this->fromSharedDirectory = true;
 351                                 $this->fileExists = true;
 352                                 $this->imagePath = $this->getFullPath(true);
 353                                 $this->name = $name;
 354                                 $this->loadFromRow( $row );
 355
 356                                 // Check for rows from a previous schema, quietly upgrade them
 357                                 $this->maybeUpgradeRow();
 358                         }
 359                 }
 360
 361                 if ( !$row ) {
 362                         $this->size = 0;
 363                         $this->width = 0;
 364                         $this->height = 0;
 365                         $this->bits = 0;
 366                         $this->type = 0;
 367                         $this->fileExists = false;
 368                         $this->fromSharedDirectory = false;
 369                         $this->metadata = '';
 370                         $this->mime = false;
 371                 }
 372
 373                 # Unconditionally set loaded=true, we don't want the accessors constantly rechecking
 374                 $this->dataLoaded = true;
 375                 wfProfileOut( __METHOD__ );
 376         }
 377
 378         /*
 379          * Load image metadata from a DB result row
 380          */
 381         function loadFromRow( &$row ) {
 382                 $this->size = $row->img_size;
 383                 $this->width = $row->img_width;
 384                 $this->height = $row->img_height;
 385                 $this->bits = $row->img_bits;
 386                 $this->type = $row->img_media_type;
 387
 388                 $major= $row->img_major_mime;
 389                 $minor= $row->img_minor_mime;
 390
 391                 if (!$major) $this->mime = "unknown/unknown";
 392                 else {
 393                         if (!$minor) $minor= "unknown";
 394                         $this->mime = $major.'/'.$minor;
 395                 }
 396                 $this->metadata = $row->img_metadata;
 397
 398                 $this->dataLoaded = true;
 399         }
 400
 401         /**
 402          * Load image metadata from cache or DB, unless already loaded
 403          */
 404         function load() {
 405                 global $wgSharedUploadDBname, $wgUseSharedUploads;
 406                 if ( !$this->dataLoaded ) {
 407                         if ( !$this->loadFromCache() ) {
 408                                 $this->loadFromDB();
 409                                 if ( !$wgSharedUploadDBname && $wgUseSharedUploads ) {
 410                                         $this->loadFromFile();
 411                                 } elseif ( $this->fileExists || !$wgUseSharedUploads ) {
 412                                         // We can do negative caching for local images, because the cache
 413                                         // will be purged on upload. But we can't do it when shared images
 414                                         // are enabled, since updates to that won't purge foreign caches.
 415                                         $this->saveToCache();
 416                                 }
 417                         }
 418                         $this->dataLoaded = true;
 419                 }
 420         }
 421
 422         /**
 423          * Upgrade a row if it needs it
 424          */
 425         function maybeUpgradeRow() {
 426                 if ( is_null($this->type) || $this->mime == 'image/svg' ) {
 427                         $this->upgradeRow();
 428                 } else {
 429                         $handler = $this->getHandler();
 430                         if ( $handler && !$handler->isMetadataValid( $this, $this->metadata ) ) {
 431                                 $this->upgradeRow();
 432                         }
 433                 }
 434         }
 435
 436         /**
 437          * Fix assorted version-related problems with the image row by reloading it from the file
 438          */
 439         function upgradeRow() {
 440                 global $wgDBname, $wgSharedUploadDBname;
 441                 wfProfileIn( __METHOD__ );
 442
 443                 $this->loadFromFile();
 444
 445                 if ( $this->fromSharedDirectory ) {
 446                         if ( !$wgSharedUploadDBname ) {
 447                                 wfProfileOut( __METHOD__ );
 448                                 return;
 449                         }
 450
 451                         // Write to the other DB using selectDB, not database selectors
 452                         // This avoids breaking replication in MySQL
 453                         $dbw = Image::getCommonsDB();
 454                 } else {
 455                         $dbw = wfGetDB( DB_MASTER );
 456                 }
 457
 458                 $this->checkDBSchema($dbw);
 459
 460                 list( $major, $minor ) = self::splitMime( $this->mime );
 461
 462                 wfDebug(__METHOD__.': upgrading '.$this->name." to the current schema\n");
 463
 464                 $dbw->update( 'image',
 465                         array(
 466                                 'img_width' => $this->width,
 467                                 'img_height' => $this->height,
 468                                 'img_bits' => $this->bits,
 469                                 'img_media_type' => $this->type,
 470                                 'img_major_mime' => $major,
 471                                 'img_minor_mime' => $minor,
 472                                 'img_metadata' => $this->metadata,
 473                         ), array( 'img_name' => $this->name ), __METHOD__
 474                 );
 475                 if ( $this->fromSharedDirectory ) {
 476                         $dbw->selectDB( $wgDBname );
 477                 }
 478                 wfProfileOut( __METHOD__ );
 479         }
 480
 481         /**
 482          * Split an internet media type into its two components; if not
 483          * a two-part name, set the minor type to 'unknown'.
 484          *
 485          * @param $mime "text/html" etc
 486          * @return array ("text", "html") etc
 487          */
 488         static function splitMime( $mime ) {
 489                 if( strpos( $mime, '/' ) !== false ) {
 490                         return explode( '/', $mime, 2 );
 491                 } else {
 492                         return array( $mime, 'unknown' );
 493                 }
 494         }
 495
 496         /**
 497          * Return the name of this image
 498          * @public
 499          */
 500         function getName() {
 501                 return $this->name;
 502         }
 503
 504         /**
 505          * Return the associated title object
 506          * @public
 507          */
 508         function getTitle() {
 509                 return $this->title;
 510         }
 511
 512         /**
 513          * Return the URL of the image file
 514          * @public
 515          */
 516         function getURL() {
 517                 if ( !$this->url ) {
 518                         $this->load();
 519                         if($this->fileExists) {
 520                                 $this->url = Image::imageUrl( $this->name, $this->fromSharedDirectory );
 521                         } else {
 522                                 $this->url = '';
 523                         }
 524                 }
 525                 return $this->url;
 526         }
 527
 528         function getViewURL() {
 529                 if( $this->mustRender()) {
 530                         if( $this->canRender() ) {
 531                                 return $this->createThumb( $this->getWidth() );
 532                         }
 533                         else {
 534                                 wfDebug('Image::getViewURL(): supposed to render '.$this->name.' ('.$this->mime."), but can't!\n");
 535                                 return $this->getURL(); #hm... return NULL?
 536                         }
 537                 } else {
 538                         return $this->getURL();
 539                 }
 540         }
 541
 542         /**
 543          * Return the image path of the image in the
 544          * local file system as an absolute path
 545          * @public
 546          */
 547         function getImagePath() {
 548                 $this->load();
 549                 return $this->imagePath;
 550         }
 551
 552         /**
 553          * Return the width of the image
 554          *
 555          * Returns false on error
 556          * @public
 557          */
 558         function getWidth( $page = 1 ) {
 559                 $this->load();
 560                 if ( $this->isMultipage() ) {
 561                         $dim = $this->getHandler()->getPageDimensions( $this, $page );
 562                         if ( $dim ) {
 563                                 return $dim['width'];
 564                         } else {
 565                                 return false;
 566                         }
 567                 } else {
 568                         return $this->width;
 569                 }
 570         }
 571
 572         /**
 573          * Return the height of the image
 574          *
 575          * Returns false on error
 576          * @public
 577          */
 578         function getHeight( $page = 1 ) {
 579                 $this->load();
 580                 if ( $this->isMultipage() ) {
 581                         $dim = $this->getHandler()->getPageDimensions( $this, $page );
 582                         if ( $dim ) {
 583                                 return $dim['height'];
 584                         } else {
 585                                 return false;
 586                         }
 587                 } else {
 588                         return $this->height;
 589                 }
 590         }
 591
 592         /**
 593          * Get handler-specific metadata
 594          */
 595         function getMetadata() {
 596                 $this->load();
 597                 return $this->metadata;
 598         }
 599
 600         /**
 601          * Return the size of the image file, in bytes
 602          * @public
 603          */
 604         function getSize() {
 605                 $this->load();
 606                 return $this->size;
 607         }
 608
 609         /**
 610          * Returns the mime type of the file.
 611          */
 612         function getMimeType() {
 613                 $this->load();
 614                 return $this->mime;
 615         }
 616
 617         /**
 618          * Return the type of the media in the file.
 619          * Use the value returned by this function with the MEDIATYPE_xxx constants.
 620          */
 621         function getMediaType() {
 622                 $this->load();
 623                 return $this->type;
 624         }
 625
 626         /**
 627          * Checks if the file can be presented to the browser as a bitmap.
 628          *
 629          * Currently, this checks if the file is an image format
 630          * that can be converted to a format
 631          * supported by all browsers (namely GIF, PNG and JPEG),
 632          * or if it is an SVG image and SVG conversion is enabled.
 633          *
 634          * @todo remember the result of this check.
 635          */
 636         function canRender() {
 637                 $handler = $this->getHandler();
 638                 return $handler && $handler->canRender();
 639         }
 640
 641         /**
 642          * Return true if the file is of a type that can't be directly
 643          * rendered by typical browsers and needs to be re-rasterized.
 644          *
 645          * This returns true for everything but the bitmap types
 646          * supported by all browsers, i.e. JPEG; GIF and PNG. It will
 647          * also return true for any non-image formats.
 648          *
 649          * @return bool
 650          */
 651         function mustRender() {
 652                 $handler = $this->getHandler();
 653                 return $handler && $handler->mustRender();
 654         }
 655
 656         /**
 657          * Determines if this media file may be shown inline on a page.
 658          *
 659          * This is currently synonymous to canRender(), but this could be
 660          * extended to also allow inline display of other media,
 661          * like flash animations or videos. If you do so, please keep in mind that
 662          * that could be a security risk.
 663          */
 664         function allowInlineDisplay() {
 665                 return $this->canRender();
 666         }
 667
 668         /**
 669          * Determines if this media file is in a format that is unlikely to
 670          * contain viruses or malicious content. It uses the global
 671          * $wgTrustedMediaFormats list to determine if the file is safe.
 672          *
 673          * This is used to show a warning on the description page of non-safe files.
 674          * It may also be used to disallow direct [[media:...]] links to such files.
 675          *
 676          * Note that this function will always return true if allowInlineDisplay()
 677          * or isTrustedFile() is true for this file.
 678          */
 679         function isSafeFile() {
 680                 if ($this->allowInlineDisplay()) return true;
 681                 if ($this->isTrustedFile()) return true;
 682
 683                 global $wgTrustedMediaFormats;
 684
 685                 $type= $this->getMediaType();
 686                 $mime= $this->getMimeType();
 687                 #wfDebug("Image::isSafeFile: type= $type, mime= $mime\n");
 688
 689                 if (!$type || $type===MEDIATYPE_UNKNOWN) return false; #unknown type, not trusted
 690                 if ( in_array( $type, $wgTrustedMediaFormats) ) return true;
 691
 692                 if ($mime==="unknown/unknown") return false; #unknown type, not trusted
 693                 if ( in_array( $mime, $wgTrustedMediaFormats) ) return true;
 694
 695                 return false;
 696         }
 697
 698         /** Returns true if the file is flagged as trusted. Files flagged that way
 699         * can be linked to directly, even if that is not allowed for this type of
 700         * file normally.
 701         *
 702         * This is a dummy function right now and always returns false. It could be
 703         * implemented to extract a flag from the database. The trusted flag could be
 704         * set on upload, if the user has sufficient privileges, to bypass script-
 705         * and html-filters. It may even be coupled with cryptographics signatures
 706         * or such.
 707         */
 708         function isTrustedFile() {
 709                 #this could be implemented to check a flag in the databas,
 710                 #look for signatures, etc
 711                 return false;
 712         }
 713
 714         /**
 715          * Return the escapeLocalURL of this image
 716          * @public
 717          */
 718         function getEscapeLocalURL( $query=false) {
 719                 return $this->getTitle()->escapeLocalURL( $query );
 720         }
 721
 722         /**
 723          * Return the escapeFullURL of this image
 724          * @public
 725          */
 726         function getEscapeFullURL() {
 727                 $this->getTitle();
 728                 return $this->title->escapeFullURL();
 729         }
 730
 731         /**
 732          * Return the URL of an image, provided its name.
 733          *
 734          * @param string $name  Name of the image, without the leading "Image:"
 735          * @param boolean $fromSharedDirectory  Should this be in $wgSharedUploadPath?
 736          * @return string URL of $name image
 737          * @public
 738          * @static
 739          */
 740         function imageUrl( $name, $fromSharedDirectory = false ) {
 741                 global $wgUploadPath,$wgUploadBaseUrl,$wgSharedUploadPath;
 742                 if($fromSharedDirectory) {
 743                         $base = '';
 744                         $path = $wgSharedUploadPath;
 745                 } else {
 746                         $base = $wgUploadBaseUrl;
 747                         $path = $wgUploadPath;
 748                 }
 749                 $url = "{$base}{$path}" .  wfGetHashPath($name, $fromSharedDirectory) . "{$name}";
 750                 return wfUrlencode( $url );
 751         }
 752
 753         /**
 754          * Returns true if the image file exists on disk.
 755          * @return boolean Whether image file exist on disk.
 756          * @public
 757          */
 758         function exists() {
 759                 $this->load();
 760                 return $this->fileExists;
 761         }
 762
 763         /**
 764          * @todo document
 765          * @private
 766          */
 767         function thumbUrlFromName( $thumbName, $subdir = 'thumb' ) {
 768                 global $wgUploadPath, $wgUploadBaseUrl, $wgSharedUploadPath;
 769                 if($this->fromSharedDirectory) {
 770                         $base = '';
 771                         $path = $wgSharedUploadPath;
 772                 } else {
 773                         $base = $wgUploadBaseUrl;
 774                         $path = $wgUploadPath;
 775                 }
 776                 if ( Image::isHashed( $this->fromSharedDirectory ) ) {
 777                         $hashdir = wfGetHashPath($this->name, $this->fromSharedDirectory) .
 778                         wfUrlencode( $this->name );
 779                 } else {
 780                         $hashdir = '';
 781                 }
 782                 $url = "{$base}{$path}/{$subdir}{$hashdir}/" . wfUrlencode( $thumbName );
 783                 return $url;
 784         }
 785
 786         /**
 787          * @deprecated Use $image->transform()->getUrl() or thumbUrlFromName()
 788          */
 789         function thumbUrl( $width, $subdir = 'thumb' ) {
 790                 $name = $this->thumbName( array( 'width' => $width ) );
 791                 if ( strval( $name ) !== '' ) {
 792                         return $this->thumbUrlFromName( $name, $subdir );
 793                 } else {
 794                         return false;
 795                 }
 796         }
 797
 798         function getTransformScript() {
 799                 global $wgSharedThumbnailScriptPath, $wgThumbnailScriptPath;
 800                 if ( $this->fromSharedDirectory ) {
 801                         $script = $wgSharedThumbnailScriptPath;
 802                 } else {
 803                         $script = $wgThumbnailScriptPath;
 804                 }
 805                 if ( $script ) {
 806                         return "$script?f=" . urlencode( $this->name );
 807                 } else {
 808                         return false;
 809                 }
 810         }
 811
 812         /**
 813          * Get a ThumbnailImage which is the same size as the source
 814          */
 815         function getUnscaledThumb( $page = false ) {
 816                 if ( $page ) {
 817                         $params = array(
 818                                 'page' => $page,
 819                                 'width' => $this->getWidth( $page )
 820                         );
 821                 } else {
 822                         $params = array( 'width' => $this->getWidth() );
 823                 }
 824                 return $this->transform( $params );
 825         }
 826
 827         /**
 828          * Return the file name of a thumbnail with the specified parameters
 829          *
 830          * @param array $params Handler-specific parameters
 831          * @private
 832          */
 833         function thumbName( $params ) {
 834                 $handler = $this->getHandler();
 835                 if ( !$handler ) {
 836                         return null;
 837                 }
 838                 list( $thumbExt, $thumbMime ) = self::getThumbType( $this->extension, $this->mime );
 839                 $thumbName = $handler->makeParamString( $params ) . '-' . $this->name;
 840                 if ( $thumbExt != $this->extension ) {
 841                         $thumbName .= ".$thumbExt";
 842                 }
 843                 return $thumbName;
 844         }
 845
 846         /**
 847          * Create a thumbnail of the image having the specified width/height.
 848          * The thumbnail will not be created if the width is larger than the
 849          * image's width. Let the browser do the scaling in this case.
 850          * The thumbnail is stored on disk and is only computed if the thumbnail
 851          * file does not exist OR if it is older than the image.
 852          * Returns the URL.
 853          *
 854          * Keeps aspect ratio of original image. If both width and height are
 855          * specified, the generated image will be no bigger than width x height,
 856          * and will also have correct aspect ratio.
 857          *
 858          * @param integer $width        maximum width of the generated thumbnail
 859          * @param integer $height       maximum height of the image (optional)
 860          * @public
 861          */
 862         function createThumb( $width, $height = -1 ) {
 863                 $params = array( 'width' => $width );
 864                 if ( $height != -1 ) {
 865                         $params['height'] = $height;
 866                 }
 867                 $thumb = $this->transform( $params );
 868                 if( is_null( $thumb ) || $thumb->isError() ) return '';
 869                 return $thumb->getUrl();
 870         }
 871
 872         /**
 873          * As createThumb, but returns a ThumbnailImage object. This can
 874          * provide access to the actual file, the real size of the thumb,
 875          * and can produce a convenient <img> tag for you.
 876          *
 877          * For non-image formats, this may return a filetype-specific icon.
 878          *
 879          * @param integer $width        maximum width of the generated thumbnail
 880          * @param integer $height       maximum height of the image (optional)
 881          * @param boolean $render       True to render the thumbnail if it doesn't exist,
 882          *                              false to just return the URL
 883          *
 884          * @return ThumbnailImage or null on failure
 885          * @public
 886          *
 887          * @deprecated use transform()
 888          */
 889         function getThumbnail( $width, $height=-1, $render = true ) {
 890                 $params = array( 'width' => $width );
 891                 if ( $height != -1 ) {
 892                         $params['height'] = $height;
 893                 }
 894                 $flags = $render ? self::RENDER_NOW : 0;
 895                 return $this->transform( $params, $flags );
 896         }
 897
 898         /**
 899          * Transform a media file
 900          *
 901          * @param array $params An associative array of handler-specific parameters. Typical
 902          *                      keys are width, height and page.
 903          * @param integer $flags A bitfield, may contain self::RENDER_NOW to force rendering
 904          * @return MediaTransformOutput
 905          */
 906         function transform( $params, $flags = 0 ) {
 907                 global $wgGenerateThumbnailOnParse, $wgUseSquid, $wgIgnoreImageErrors;
 908
 909                 wfProfileIn( __METHOD__ );
 910                 do {
 911                         $handler = $this->getHandler();
 912                         if ( !$handler || !$handler->canRender() ) {
 913                                 // not a bitmap or renderable image, don't try.
 914                                 $thumb = $this->iconThumb();
 915                                 break;
 916                         }
 917
 918                         $script = $this->getTransformScript();
 919                         if ( $script && !($flags & self::RENDER_NOW) ) {
 920                                 // Use a script to transform on client request
 921                                 $thumb = $handler->getScriptedTransform( $this, $script, $params );
 922                                 break;
 923                         }
 924
 925                         $normalisedParams = $params;
 926                         $handler->normaliseParams( $this, $normalisedParams );
 927                         list( $thumbExt, $thumbMime ) = self::getThumbType( $this->extension, $this->mime );
 928                         $thumbName = $this->thumbName( $normalisedParams );
 929                         $thumbPath = wfImageThumbDir( $this->name, $this->fromSharedDirectory ) .  "/$thumbName";
 930                         $thumbUrl = $this->thumbUrlFromName( $thumbName );
 931
 932                         $this->migrateThumbFile( $thumbName );
 933
 934                         if ( file_exists( $thumbPath ) ) {
 935                                 $thumb = $handler->getTransform( $this, $thumbPath, $thumbUrl, $params );
 936                                 break;
 937                         }
 938
 939                         if ( !$wgGenerateThumbnailOnParse && !($flags & self::RENDER_NOW ) ) {
 940                                 $thumb = $handler->getTransform( $this, $thumbPath, $thumbUrl, $params );
 941                                 break;
 942                         }
 943                         $thumb = $handler->doTransform( $this, $thumbPath, $thumbUrl, $params );
 944
 945                         // Ignore errors if requested
 946                         if ( !$thumb ) {
 947                                 $thumb = null;
 948                         } elseif ( $thumb->isError() ) {
 949                                 $this->lastError = $thumb->toText();
 950                                 if ( $wgIgnoreImageErrors && !($flags & self::RENDER_NOW) ) {
 951                                         $thumb = $handler->getTransform( $this, $thumbPath, $thumbUrl, $params );
 952                                 }
 953                         }
 954
 955                         if ( $wgUseSquid ) {
 956                                 wfPurgeSquidServers( array( $thumbUrl ) );
 957                         }
 958                 } while (false);
 959
 960                 wfProfileOut( __METHOD__ );
 961                 return $thumb;
 962         }
 963
 964         /**
 965          * Fix thumbnail files from 1.4 or before, with extreme prejudice
 966          */
 967         function migrateThumbFile( $thumbName ) {
 968                 $thumbDir = wfImageThumbDir( $this->name, $this->fromSharedDirectory );
 969                 $thumbPath = "$thumbDir/$thumbName";
 970                 if ( is_dir( $thumbPath ) ) {
 971                         // Directory where file should be
 972                         // This happened occasionally due to broken migration code in 1.5
 973                         // Rename to broken-*
 974                         global $wgUploadDirectory;
 975                         for ( $i = 0; $i < 100 ; $i++ ) {
 976                                 $broken = "$wgUploadDirectory/broken-$i-$thumbName";
 977                                 if ( !file_exists( $broken ) ) {
 978                                         rename( $thumbPath, $broken );
 979                                         break;
 980                                 }
 981                         }
 982                         // Doesn't exist anymore
 983                         clearstatcache();
 984                 }
 985                 if ( is_file( $thumbDir ) ) {
 986                         // File where directory should be
 987                         unlink( $thumbDir );
 988                         // Doesn't exist anymore
 989                         clearstatcache();
 990                 }
 991         }
 992
 993         /**
 994          * Get a MediaHandler instance for this image
 995          */
 996         function getHandler() {
 997                 return MediaHandler::getHandler( $this->getMimeType() );
 998         }
 999
1000         /**
1001          * Get a ThumbnailImage representing a file type icon
1002          * @return ThumbnailImage
1003          */
1004         function iconThumb() {
1005                 global $wgStylePath, $wgStyleDirectory;
1006
1007                 $try = array( 'fileicon-' . $this->extension . '.png', 'fileicon.png' );
1008                 foreach( $try as $icon ) {
1009                         $path = '/common/images/icons/' . $icon;
1010                         $filepath = $wgStyleDirectory . $path;
1011                         if( file_exists( $filepath ) ) {
1012                                 return new ThumbnailImage( $wgStylePath . $path, 120, 120 );
1013                         }
1014                 }
1015                 return null;
1016         }
1017
1018         /**
1019          * Get last thumbnailing error.
1020          * Largely obsolete.
1021          */
1022         function getLastError() {
1023                 return $this->lastError;
1024         }
1025
1026         /**
1027          * Get all thumbnail names previously generated for this image
1028          */
1029         function getThumbnails( $shared = false ) {
1030                 if ( Image::isHashed( $shared ) ) {
1031                         $this->load();
1032                         $files = array();
1033                         $dir = wfImageThumbDir( $this->name, $shared );
1034
1035                         if ( is_dir( $dir ) ) {
1036                                 $handle = opendir( $dir );
1037
1038                                 if ( $handle ) {
1039                                         while ( false !== ( $file = readdir($handle) ) ) {
1040                                                 if ( $file{0} != '.' ) {
1041                                                         $files[] = $file;
1042                                                 }
1043                                         }
1044                                         closedir( $handle );
1045                                 }
1046                         }
1047                 } else {
1048                         $files = array();
1049                 }
1050
1051                 return $files;
1052         }
1053
1054         /**
1055          * Refresh metadata in memcached, but don't touch thumbnails or squid
1056          */
1057         function purgeMetadataCache() {
1058                 clearstatcache();
1059                 $this->upgradeRow();
1060                 $this->saveToCache();
1061         }
1062
1063         /**
1064          * Delete all previously generated thumbnails, refresh metadata in memcached and purge the squid
1065          */
1066         function purgeCache( $archiveFiles = array(), $shared = false ) {
1067                 global $wgUseSquid;
1068
1069                 // Refresh metadata cache
1070                 $this->purgeMetadataCache();
1071
1072                 // Delete thumbnails
1073                 $files = $this->getThumbnails( $shared );
1074                 $dir = wfImageThumbDir( $this->name, $shared );
1075                 $urls = array();
1076                 foreach ( $files as $file ) {
1077                         $m = array();
1078                         if ( preg_match( '/^\d+px/', $file, $m ) ) {
1079                                 $url = $this->thumbUrlFromName( $file );
1080                                 $urls[] = $url;
1081                                 @unlink( "$dir/$file" );
1082                         }
1083                 }
1084
1085                 // Purge the squid
1086                 if ( $wgUseSquid ) {
1087                         $urls[] = $this->getURL();
1088                         foreach ( $archiveFiles as $file ) {
1089                                 $urls[] = wfImageArchiveUrl( $file );
1090                         }
1091                         wfPurgeSquidServers( $urls );
1092                 }
1093         }
1094
1095         /**
1096          * Purge the image description page, but don't go after
1097          * pages using the image. Use when modifying file history
1098          * but not the current data.
1099          */
1100         function purgeDescription() {
1101                 $page = Title::makeTitle( NS_IMAGE, $this->name );
1102                 $page->invalidateCache();
1103                 $page->purgeSquid();
1104         }
1105
1106         /**
1107          * Purge metadata and all affected pages when the image is created,
1108          * deleted, or majorly updated. A set of additional URLs may be
1109          * passed to purge, such as specific image files which have changed.
1110          * @param $urlArray array
1111          */
1112         function purgeEverything( $urlArr=array() ) {
1113                 // Delete thumbnails and refresh image metadata cache
1114                 $this->purgeCache();
1115                 $this->purgeDescription();
1116
1117                 // Purge cache of all pages using this image
1118                 $update = new HTMLCacheUpdate( $this->getTitle(), 'imagelinks' );
1119                 $update->doUpdate();
1120         }
1121
1122         /**
1123          * Check the image table schema on the given connection for subtle problems
1124          */
1125         function checkDBSchema(&$db) {
1126                 static $checkDone = false;
1127                 global $wgCheckDBSchema;
1128                 if (!$wgCheckDBSchema || $checkDone) {
1129                         return;
1130                 }
1131                 # img_name must be unique
1132                 if ( !$db->indexUnique( 'image', 'img_name' ) && !$db->indexExists('image','PRIMARY') ) {
1133                         throw new MWException( 'Database schema not up to date, please run maintenance/archives/patch-image_name_unique.sql' );
1134                 }
1135                 $checkDone = true;
1136
1137                 # new fields must exist
1138                 #
1139                 # Not really, there's hundreds of checks like this that we could do and they're all pointless, because
1140                 # if the fields are missing, the database will loudly report a query error, the first time you try to do
1141                 # something. The only reason I put the above schema check in was because the absence of that particular
1142                 # index would lead to an annoying subtle bug. No error message, just some very odd behaviour on duplicate
1143                 # uploads. -- TS
1144                 /*
1145                 if ( !$db->fieldExists( 'image', 'img_media_type' )
1146                   || !$db->fieldExists( 'image', 'img_metadata' )
1147                   || !$db->fieldExists( 'image', 'img_width' ) ) {
1148
1149                         throw new MWException( 'Database schema not up to date, please run maintenance/update.php' );
1150                  }
1151                  */
1152         }
1153
1154         /**
1155          * Return the image history of this image, line by line.
1156          * starts with current version, then old versions.
1157          * uses $this->historyLine to check which line to return:
1158          *  0      return line for current version
1159          *  1      query for old versions, return first one
1160          *  2, ... return next old version from above query
1161          *
1162          * @public
1163          */
1164         function nextHistoryLine() {
1165                 $dbr = wfGetDB( DB_SLAVE );
1166
1167                 $this->checkDBSchema($dbr);
1168
1169                 if ( $this->historyLine == 0 ) {// called for the first time, return line from cur
1170                         $this->historyRes = $dbr->select( 'image',
1171                                 array(
1172                                         'img_size',
1173                                         'img_description',
1174                                         'img_user','img_user_text',
1175                                         'img_timestamp',
1176                                         'img_width',
1177                                         'img_height',
1178                                         "'' AS oi_archive_name"
1179                                 ),
1180                                 array( 'img_name' => $this->title->getDBkey() ),
1181                                 __METHOD__
1182                         );
1183                         if ( 0 == $dbr->numRows( $this->historyRes ) ) {
1184                                 return FALSE;
1185                         }
1186                 } else if ( $this->historyLine == 1 ) {
1187                         $this->historyRes = $dbr->select( 'oldimage',
1188                                 array(
1189                                         'oi_size AS img_size',
1190                                         'oi_description AS img_description',
1191                                         'oi_user AS img_user',
1192                                         'oi_user_text AS img_user_text',
1193                                         'oi_timestamp AS img_timestamp',
1194                                         'oi_width as img_width',
1195                                         'oi_height as img_height',
1196                                         'oi_archive_name'
1197                                 ),
1198                                 array( 'oi_name' => $this->title->getDBkey() ),
1199                                 __METHOD__,
1200                                 array( 'ORDER BY' => 'oi_timestamp DESC' )
1201                         );
1202                 }
1203                 $this->historyLine ++;
1204
1205                 return $dbr->fetchObject( $this->historyRes );
1206         }
1207
1208         /**
1209          * Reset the history pointer to the first element of the history
1210          * @public
1211          */
1212         function resetHistory() {
1213                 $this->historyLine = 0;
1214         }
1215
1216         /**
1217         * Return the full filesystem path to the file. Note that this does
1218         * not mean that a file actually exists under that location.
1219         *
1220         * This path depends on whether directory hashing is active or not,
1221         * i.e. whether the images are all found in the same directory,
1222         * or in hashed paths like /images/3/3c.
1223         *
1224         * @public
1225         * @param boolean $fromSharedDirectory Return the path to the file
1226         *   in a shared repository (see $wgUseSharedRepository and related
1227         *   options in DefaultSettings.php) instead of a local one.
1228         *
1229         */
1230         function getFullPath( $fromSharedRepository = false ) {
1231                 global $wgUploadDirectory, $wgSharedUploadDirectory;
1232
1233                 $dir      = $fromSharedRepository ? $wgSharedUploadDirectory :
1234                                                     $wgUploadDirectory;
1235
1236                 // $wgSharedUploadDirectory may be false, if thumb.php is used
1237                 if ( $dir ) {
1238                         $fullpath = $dir . wfGetHashPath($this->name, $fromSharedRepository) . $this->name;
1239                 } else {
1240                         $fullpath = false;
1241                 }
1242
1243                 return $fullpath;
1244         }
1245
1246         /**
1247          * @return bool
1248          * @static
1249          */
1250         public static function isHashed( $shared ) {
1251                 global $wgHashedUploadDirectory, $wgHashedSharedUploadDirectory;
1252                 return $shared ? $wgHashedSharedUploadDirectory : $wgHashedUploadDirectory;
1253         }
1254
1255         /**
1256          * Record an image upload in the upload log and the image table
1257          */
1258         function recordUpload( $oldver, $desc, $license = '', $copyStatus = '', $source = '', $watch = false ) {
1259                 global $wgUser, $wgUseCopyrightUpload;
1260
1261                 $dbw = wfGetDB( DB_MASTER );
1262
1263                 $this->checkDBSchema($dbw);
1264
1265                 // Delete thumbnails and refresh the metadata cache
1266                 $this->purgeCache();
1267
1268                 // Fail now if the image isn't there
1269                 if ( !$this->fileExists || $this->fromSharedDirectory ) {
1270                         wfDebug( "Image::recordUpload: File ".$this->imagePath." went missing!\n" );
1271                         return false;
1272                 }
1273
1274                 if ( $wgUseCopyrightUpload ) {
1275                         if ( $license != '' ) {
1276                                 $licensetxt = '== ' . wfMsgForContent( 'license' ) . " ==\n" . '{{' . $license . '}}' . "\n";
1277                         }
1278                         $textdesc = '== ' . wfMsg ( 'filedesc' ) . " ==\n" . $desc . "\n" .
1279                           '== ' . wfMsgForContent ( 'filestatus' ) . " ==\n" . $copyStatus . "\n" .
1280                           "$licensetxt" .
1281                           '== ' . wfMsgForContent ( 'filesource' ) . " ==\n" . $source ;
1282                 } else {
1283                         if ( $license != '' ) {
1284                                 $filedesc = $desc == '' ? '' : '== ' . wfMsg ( 'filedesc' ) . " ==\n" . $desc . "\n";
1285                                  $textdesc = $filedesc .
1286                                          '== ' . wfMsgForContent ( 'license' ) . " ==\n" . '{{' . $license . '}}' . "\n";
1287                         } else {
1288                                 $textdesc = $desc;
1289                         }
1290                 }
1291
1292                 $now = $dbw->timestamp();
1293
1294                 #split mime type
1295                 if (strpos($this->mime,'/')!==false) {
1296                         list($major,$minor)= explode('/',$this->mime,2);
1297                 }
1298                 else {
1299                         $major= $this->mime;
1300                         $minor= "unknown";
1301                 }
1302
1303                 # Test to see if the row exists using INSERT IGNORE
1304                 # This avoids race conditions by locking the row until the commit, and also
1305                 # doesn't deadlock. SELECT FOR UPDATE causes a deadlock for every race condition.
1306                 $dbw->insert( 'image',
1307                         array(
1308                                 'img_name' => $this->name,
1309                                 'img_size'=> $this->size,
1310                                 'img_width' => intval( $this->width ),
1311                                 'img_height' => intval( $this->height ),
1312                                 'img_bits' => $this->bits,
1313                                 'img_media_type' => $this->type,
1314                                 'img_major_mime' => $major,
1315                                 'img_minor_mime' => $minor,
1316                                 'img_timestamp' => $now,
1317                                 'img_description' => $desc,
1318                                 'img_user' => $wgUser->getID(),
1319                                 'img_user_text' => $wgUser->getName(),
1320                                 'img_metadata' => $this->metadata,
1321                         ),
1322                         __METHOD__,
1323                         'IGNORE'
1324                 );
1325
1326                 if( $dbw->affectedRows() == 0 ) {
1327                         # Collision, this is an update of an image
1328                         # Insert previous contents into oldimage
1329                         $dbw->insertSelect( 'oldimage', 'image',
1330                                 array(
1331                                         'oi_name' => 'img_name',
1332                                         'oi_archive_name' => $dbw->addQuotes( $oldver ),
1333                                         'oi_size' => 'img_size',
1334                                         'oi_width' => 'img_width',
1335                                         'oi_height' => 'img_height',
1336                                         'oi_bits' => 'img_bits',
1337                                         'oi_timestamp' => 'img_timestamp',
1338                                         'oi_description' => 'img_description',
1339                                         'oi_user' => 'img_user',
1340                                         'oi_user_text' => 'img_user_text',
1341                                 ), array( 'img_name' => $this->name ), __METHOD__
1342                         );
1343
1344                         # Update the current image row
1345                         $dbw->update( 'image',
1346                                 array( /* SET */
1347                                         'img_size' => $this->size,
1348                                         'img_width' => intval( $this->width ),
1349                                         'img_height' => intval( $this->height ),
1350                                         'img_bits' => $this->bits,
1351                                         'img_media_type' => $this->type,
1352                                         'img_major_mime' => $major,
1353                                         'img_minor_mime' => $minor,
1354                                         'img_timestamp' => $now,
1355                                         'img_description' => $desc,
1356                                         'img_user' => $wgUser->getID(),
1357                                         'img_user_text' => $wgUser->getName(),
1358                                         'img_metadata' => $this->metadata,
1359                                 ), array( /* WHERE */
1360                                         'img_name' => $this->name
1361                                 ), __METHOD__
1362                         );
1363                 } else {
1364                         # This is a new image
1365                         # Update the image count
1366                         $site_stats = $dbw->tableName( 'site_stats' );
1367                         $dbw->query( "UPDATE $site_stats SET ss_images=ss_images+1", __METHOD__ );
1368                 }
1369
1370                 $descTitle = $this->getTitle();
1371                 $article = new Article( $descTitle );
1372                 $minor = false;
1373                 $watch = $watch || $wgUser->isWatched( $descTitle );
1374                 $suppressRC = true; // There's already a log entry, so don't double the RC load
1375
1376                 if( $descTitle->exists() ) {
1377                         // TODO: insert a null revision into the page history for this update.
1378                         if( $watch ) {
1379                                 $wgUser->addWatch( $descTitle );
1380                         }
1381
1382                         # Invalidate the cache for the description page
1383                         $descTitle->invalidateCache();
1384                         $descTitle->purgeSquid();
1385                 } else {
1386                         // New image; create the description page.
1387                         $article->insertNewArticle( $textdesc, $desc, $minor, $watch, $suppressRC );
1388                 }
1389
1390                 # Hooks, hooks, the magic of hooks...
1391                 wfRunHooks( 'FileUpload', array( $this ) );
1392
1393                 # Add the log entry
1394                 $log = new LogPage( 'upload' );
1395                 $log->addEntry( 'upload', $descTitle, $desc );
1396
1397                 # Commit the transaction now, in case something goes wrong later
1398                 # The most important thing is that images don't get lost, especially archives
1399                 $dbw->immediateCommit();
1400
1401                 # Invalidate cache for all pages using this image
1402                 $update = new HTMLCacheUpdate( $this->getTitle(), 'imagelinks' );
1403                 $update->doUpdate();
1404
1405                 return true;
1406         }
1407
1408         /**
1409          * Get an array of Title objects which are articles which use this image
1410          * Also adds their IDs to the link cache
1411          *
1412          * This is mostly copied from Title::getLinksTo()
1413          *
1414          * @deprecated Use HTMLCacheUpdate, this function uses too much memory
1415          */
1416         function getLinksTo( $options = '' ) {
1417                 wfProfileIn( __METHOD__ );
1418
1419                 if ( $options ) {
1420                         $db = wfGetDB( DB_MASTER );
1421                 } else {
1422                         $db = wfGetDB( DB_SLAVE );
1423                 }
1424                 $linkCache =& LinkCache::singleton();
1425
1426                 list( $page, $imagelinks ) = $db->tableNamesN( 'page', 'imagelinks' );
1427                 $encName = $db->addQuotes( $this->name );
1428                 $sql = "SELECT page_namespace,page_title,page_id FROM $page,$imagelinks WHERE page_id=il_from AND il_to=$encName $options";
1429                 $res = $db->query( $sql, __METHOD__ );
1430
1431                 $retVal = array();
1432                 if ( $db->numRows( $res ) ) {
1433                         while ( $row = $db->fetchObject( $res ) ) {
1434                                 if ( $titleObj = Title::makeTitle( $row->page_namespace, $row->page_title ) ) {
1435                                         $linkCache->addGoodLinkObj( $row->page_id, $titleObj );
1436                                         $retVal[] = $titleObj;
1437                                 }
1438                         }
1439                 }
1440                 $db->freeResult( $res );
1441                 wfProfileOut( __METHOD__ );
1442                 return $retVal;
1443         }
1444
1445         function getExifData() {
1446                 global $wgRequest;
1447                 $handler = $this->getHandler();
1448                 if ( !$handler || $handler->getMetadataType( $this ) != 'exif' ) {
1449                         return array();
1450                 }
1451                 if ( !$this->metadata ) {
1452                         return array();
1453                 }
1454                 $exif = unserialize( $this->metadata );
1455                 if ( !$exif ) {
1456                         return array();
1457                 }
1458                 unset( $exif['MEDIAWIKI_EXIF_VERSION'] );
1459                 $format = new FormatExif( $exif );
1460
1461                 return $format->getFormattedData();
1462         }
1463
1464         /**
1465          * Returns true if the image does not come from the shared
1466          * image repository.
1467          *
1468          * @return bool
1469          */
1470         function isLocal() {
1471                 return !$this->fromSharedDirectory;
1472         }
1473
1474         /**
1475          * Was this image ever deleted from the wiki?
1476          *
1477          * @return bool
1478          */
1479         function wasDeleted() {
1480                 $title = Title::makeTitle( NS_IMAGE, $this->name );
1481                 return ( $title->isDeleted() > 0 );
1482         }
1483
1484         /**
1485          * Delete all versions of the image.
1486          *
1487          * Moves the files into an archive directory (or deletes them)
1488          * and removes the database rows.
1489          *
1490          * Cache purging is done; logging is caller's responsibility.
1491          *
1492          * @param $reason
1493          * @return true on success, false on some kind of failure
1494          */
1495         function delete( $reason, $suppress=false ) {
1496                 $transaction = new FSTransaction();
1497                 $urlArr = array( $this->getURL() );
1498
1499                 if( !FileStore::lock() ) {
1500                         wfDebug( __METHOD__.": failed to acquire file store lock, aborting\n" );
1501                         return false;
1502                 }
1503
1504                 try {
1505                         $dbw = wfGetDB( DB_MASTER );
1506                         $dbw->begin();
1507
1508                         // Delete old versions
1509                         $result = $dbw->select( 'oldimage',
1510                                 array( 'oi_archive_name' ),
1511                                 array( 'oi_name' => $this->name ) );
1512
1513                         while( $row = $dbw->fetchObject( $result ) ) {
1514                                 $oldName = $row->oi_archive_name;
1515
1516                                 $transaction->add( $this->prepareDeleteOld( $oldName, $reason, $suppress ) );
1517
1518                                 // We'll need to purge this URL from caches...
1519                                 $urlArr[] = wfImageArchiveUrl( $oldName );
1520                         }
1521                         $dbw->freeResult( $result );
1522
1523                         // And the current version...
1524                         $transaction->add( $this->prepareDeleteCurrent( $reason, $suppress ) );
1525
1526                         $dbw->immediateCommit();
1527                 } catch( MWException $e ) {
1528                         wfDebug( __METHOD__.": db error, rolling back file transactions\n" );
1529                         $transaction->rollback();
1530                         FileStore::unlock();
1531                         throw $e;
1532                 }
1533
1534                 wfDebug( __METHOD__.": deleted db items, applying file transactions\n" );
1535                 $transaction->commit();
1536                 FileStore::unlock();
1537
1538
1539                 // Update site_stats
1540                 $site_stats = $dbw->tableName( 'site_stats' );
1541                 $dbw->query( "UPDATE $site_stats SET ss_images=ss_images-1", __METHOD__ );
1542
1543                 $this->purgeEverything( $urlArr );
1544
1545                 return true;
1546         }
1547
1548
1549         /**
1550          * Delete an old version of the image.
1551          *
1552          * Moves the file into an archive directory (or deletes it)
1553          * and removes the database row.
1554          *
1555          * Cache purging is done; logging is caller's responsibility.
1556          *
1557          * @param $reason
1558          * @throws MWException or FSException on database or filestore failure
1559          * @return true on success, false on some kind of failure
1560          */
1561         function deleteOld( $archiveName, $reason, $suppress=false ) {
1562                 $transaction = new FSTransaction();
1563                 $urlArr = array();
1564
1565                 if( !FileStore::lock() ) {
1566                         wfDebug( __METHOD__.": failed to acquire file store lock, aborting\n" );
1567                         return false;
1568                 }
1569
1570                 $transaction = new FSTransaction();
1571                 try {
1572                         $dbw = wfGetDB( DB_MASTER );
1573                         $dbw->begin();
1574                         $transaction->add( $this->prepareDeleteOld( $archiveName, $reason, $suppress ) );
1575                         $dbw->immediateCommit();
1576                 } catch( MWException $e ) {
1577                         wfDebug( __METHOD__.": db error, rolling back file transaction\n" );
1578                         $transaction->rollback();
1579                         FileStore::unlock();
1580                         throw $e;
1581                 }
1582
1583                 wfDebug( __METHOD__.": deleted db items, applying file transaction\n" );
1584                 $transaction->commit();
1585                 FileStore::unlock();
1586
1587                 $this->purgeDescription();
1588
1589                 // Squid purging
1590                 global $wgUseSquid;
1591                 if ( $wgUseSquid ) {
1592                         $urlArr = array(
1593                                 wfImageArchiveUrl( $archiveName ),
1594                         );
1595                         wfPurgeSquidServers( $urlArr );
1596                 }
1597                 return true;
1598         }
1599
1600         /**
1601          * Delete the current version of a file.
1602          * May throw a database error.
1603          * @return true on success, false on failure
1604          */
1605         private function prepareDeleteCurrent( $reason, $suppress=false ) {
1606                 return $this->prepareDeleteVersion(
1607                         $this->getFullPath(),
1608                         $reason,
1609                         'image',
1610                         array(
1611                                 'fa_name'         => 'img_name',
1612                                 'fa_archive_name' => 'NULL',
1613                                 'fa_size'         => 'img_size',
1614                                 'fa_width'        => 'img_width',
1615                                 'fa_height'       => 'img_height',
1616                                 'fa_metadata'     => 'img_metadata',
1617                                 'fa_bits'         => 'img_bits',
1618                                 'fa_media_type'   => 'img_media_type',
1619                                 'fa_major_mime'   => 'img_major_mime',
1620                                 'fa_minor_mime'   => 'img_minor_mime',
1621                                 'fa_description'  => 'img_description',
1622                                 'fa_user'         => 'img_user',
1623                                 'fa_user_text'    => 'img_user_text',
1624                                 'fa_timestamp'    => 'img_timestamp' ),
1625                         array( 'img_name' => $this->name ),
1626                         $suppress,
1627                         __METHOD__ );
1628         }
1629
1630         /**
1631          * Delete a given older version of a file.
1632          * May throw a database error.
1633          * @return true on success, false on failure
1634          */
1635         private function prepareDeleteOld( $archiveName, $reason, $suppress=false ) {
1636                 $oldpath = wfImageArchiveDir( $this->name ) .
1637                         DIRECTORY_SEPARATOR . $archiveName;
1638                 return $this->prepareDeleteVersion(
1639                         $oldpath,
1640                         $reason,
1641                         'oldimage',
1642                         array(
1643                                 'fa_name'         => 'oi_name',
1644                                 'fa_archive_name' => 'oi_archive_name',
1645                                 'fa_size'         => 'oi_size',
1646                                 'fa_width'        => 'oi_width',
1647                                 'fa_height'       => 'oi_height',
1648                                 'fa_metadata'     => 'NULL',
1649                                 'fa_bits'         => 'oi_bits',
1650                                 'fa_media_type'   => 'NULL',
1651                                 'fa_major_mime'   => 'NULL',
1652                                 'fa_minor_mime'   => 'NULL',
1653                                 'fa_description'  => 'oi_description',
1654                                 'fa_user'         => 'oi_user',
1655                                 'fa_user_text'    => 'oi_user_text',
1656                                 'fa_timestamp'    => 'oi_timestamp' ),
1657                         array(
1658                                 'oi_name' => $this->name,
1659                                 'oi_archive_name' => $archiveName ),
1660                         $suppress,
1661                         __METHOD__ );
1662         }
1663
1664         /**
1665          * Do the dirty work of backing up an image row and its file
1666          * (if $wgSaveDeletedFiles is on) and removing the originals.
1667          *
1668          * Must be run while the file store is locked and a database
1669          * transaction is open to avoid race conditions.
1670          *
1671          * @return FSTransaction
1672          */
1673         private function prepareDeleteVersion( $path, $reason, $table, $fieldMap, $where, $suppress=false, $fname ) {
1674                 global $wgUser, $wgSaveDeletedFiles;
1675
1676                 // Dupe the file into the file store
1677                 if( file_exists( $path ) ) {
1678                         if( $wgSaveDeletedFiles ) {
1679                                 $group = 'deleted';
1680
1681                                 $store = FileStore::get( $group );
1682                                 $key = FileStore::calculateKey( $path, $this->extension );
1683                                 $transaction = $store->insert( $key, $path,
1684                                         FileStore::DELETE_ORIGINAL );
1685                         } else {
1686                                 $group = null;
1687                                 $key = null;
1688                                 $transaction = FileStore::deleteFile( $path );
1689                         }
1690                 } else {
1691                         wfDebug( __METHOD__." deleting already-missing '$path'; moving on to database\n" );
1692                         $group = null;
1693                         $key = null;
1694                         $transaction = new FSTransaction(); // empty
1695                 }
1696
1697                 if( $transaction === false ) {
1698                         // Fail to restore?
1699                         wfDebug( __METHOD__.": import to file store failed, aborting\n" );
1700                         throw new MWException( "Could not archive and delete file $path" );
1701                         return false;
1702                 }
1703
1704                 // Bitfields to further supress the image content
1705                 // Note that currently, live images are stored elsewhere
1706                 // and cannot be partially deleted
1707                 $bitfield = 0;
1708                 if ( $suppress ) {
1709                         $bitfield |= self::DELETED_FILE;
1710                         $bitfield |= self::DELETED_COMMENT;
1711                         $bitfield |= self::DELETED_USER;
1712                         $bitfield |= self::DELETED_RESTRICTED;
1713                 }
1714
1715                 $dbw = wfGetDB( DB_MASTER );
1716                 $storageMap = array(
1717                         'fa_storage_group' => $dbw->addQuotes( $group ),
1718                         'fa_storage_key'   => $dbw->addQuotes( $key ),
1719
1720                         'fa_deleted_user'      => $dbw->addQuotes( $wgUser->getId() ),
1721                         'fa_deleted_timestamp' => $dbw->timestamp(),
1722                         'fa_deleted_reason'    => $dbw->addQuotes( $reason ),
1723                         'fa_deleted'               => $bitfield);
1724                 $allFields = array_merge( $storageMap, $fieldMap );
1725
1726                 try {
1727                         if( $wgSaveDeletedFiles ) {
1728                                 $dbw->insertSelect( 'filearchive', $table, $allFields, $where, $fname );
1729                         }
1730                         $dbw->delete( $table, $where, $fname );
1731                 } catch( DBQueryError $e ) {
1732                         // Something went horribly wrong!
1733                         // Leave the file as it was...
1734                         wfDebug( __METHOD__.": database error, rolling back file transaction\n" );
1735                         $transaction->rollback();
1736                         throw $e;
1737                 }
1738
1739                 return $transaction;
1740         }
1741
1742         /**
1743          * Restore all or specified deleted revisions to the given file.
1744          * Permissions and logging are left to the caller.
1745          *
1746          * May throw database exceptions on error.
1747          *
1748          * @param $versions set of record ids of deleted items to restore,
1749          *                    or empty to restore all revisions.
1750          * @return the number of file revisions restored if successful,
1751          *         or false on failure
1752          */
1753         function restore( $versions=array(), $Unsuppress=false ) {
1754                 global $wgUser;
1755
1756                 if( !FileStore::lock() ) {
1757                         wfDebug( __METHOD__." could not acquire filestore lock\n" );
1758                         return false;
1759                 }
1760
1761                 $transaction = new FSTransaction();
1762                 try {
1763                         $dbw = wfGetDB( DB_MASTER );
1764                         $dbw->begin();
1765
1766                         // Re-confirm whether this image presently exists;
1767                         // if no we'll need to create an image record for the
1768                         // first item we restore.
1769                         $exists = $dbw->selectField( 'image', '1',
1770                                 array( 'img_name' => $this->name ),
1771                                 __METHOD__ );
1772
1773                         // Fetch all or selected archived revisions for the file,
1774                         // sorted from the most recent to the oldest.
1775                         $conditions = array( 'fa_name' => $this->name );
1776                         if( $versions ) {
1777                                 $conditions['fa_id'] = $versions;
1778                         }
1779
1780                         $result = $dbw->select( 'filearchive', '*',
1781                                 $conditions,
1782                                 __METHOD__,
1783                                 array( 'ORDER BY' => 'fa_timestamp DESC' ) );
1784
1785                         if( $dbw->numRows( $result ) < count( $versions ) ) {
1786                                 // There's some kind of conflict or confusion;
1787                                 // we can't restore everything we were asked to.
1788                                 wfDebug( __METHOD__.": couldn't find requested items\n" );
1789                                 $dbw->rollback();
1790                                 FileStore::unlock();
1791                                 return false;
1792                         }
1793
1794                         if( $dbw->numRows( $result ) == 0 ) {
1795                                 // Nothing to do.
1796                                 wfDebug( __METHOD__.": nothing to do\n" );
1797                                 $dbw->rollback();
1798                                 FileStore::unlock();
1799                                 return true;
1800                         }
1801
1802                         $revisions = 0;
1803                         while( $row = $dbw->fetchObject( $result ) ) {
1804                                 if ( $Unsuppress ) {
1805                                 // Currently, fa_deleted flags fall off upon restore, lets be careful about this
1806                                 } else if ( ($row->fa_deleted & Revision::DELETED_RESTRICTED) && !$wgUser->isAllowed('hiderevision') ) {
1807                                 // Skip restoring file revisions that the user cannot restore
1808                                         continue;
1809                                 }
1810                                 $revisions++;
1811                                 $store = FileStore::get( $row->fa_storage_group );
1812                                 if( !$store ) {
1813                                         wfDebug( __METHOD__.": skipping row with no file.\n" );
1814                                         continue;
1815                                 }
1816
1817                                 if( $revisions == 1 && !$exists ) {
1818                                         $destDir = wfImageDir( $row->fa_name );
1819                                         if ( !is_dir( $destDir ) ) {
1820                                                 wfMkdirParents( $destDir );
1821                                         }
1822                                         $destPath = $destDir . DIRECTORY_SEPARATOR . $row->fa_name;
1823
1824                                         // We may have to fill in data if this was originally
1825                                         // an archived file revision.
1826                                         if( is_null( $row->fa_metadata ) ) {
1827                                                 $tempFile = $store->filePath( $row->fa_storage_key );
1828
1829                                                 $magic = MimeMagic::singleton();
1830                                                 $mime = $magic->guessMimeType( $tempFile, true );
1831                                                 $media_type = $magic->getMediaType( $tempFile, $mime );
1832                                                 list( $major_mime, $minor_mime ) = self::splitMime( $mime );
1833                                                 $handler = MediaHandler::getHandler( $mime );
1834                                                 if ( $handler ) {
1835                                                         $metadata = $handler->getMetadata( $image, $tempFile );
1836                                                 } else {
1837                                                         $metadata = '';
1838                                                 }
1839                                         } else {
1840                                                 $metadata   = $row->fa_metadata;
1841                                                 $major_mime = $row->fa_major_mime;
1842                                                 $minor_mime = $row->fa_minor_mime;
1843                                                 $media_type = $row->fa_media_type;
1844                                         }
1845
1846                                         $table = 'image';
1847                                         $fields = array(
1848                                                 'img_name'        => $row->fa_name,
1849                                                 'img_size'        => $row->fa_size,
1850                                                 'img_width'       => $row->fa_width,
1851                                                 'img_height'      => $row->fa_height,
1852                                                 'img_metadata'    => $metadata,
1853                                                 'img_bits'        => $row->fa_bits,
1854                                                 'img_media_type'  => $media_type,
1855                                                 'img_major_mime'  => $major_mime,
1856                                                 'img_minor_mime'  => $minor_mime,
1857                                                 'img_description' => $row->fa_description,
1858                                                 'img_user'        => $row->fa_user,
1859                                                 'img_user_text'   => $row->fa_user_text,
1860                                                 'img_timestamp'   => $row->fa_timestamp );
1861                                 } else {
1862                                         $archiveName = $row->fa_archive_name;
1863                                         if( $archiveName == '' ) {
1864                                                 // This was originally a current version; we
1865                                                 // have to devise a new archive name for it.
1866                                                 // Format is <timestamp of archiving>!<name>
1867                                                 $archiveName =
1868                                                         wfTimestamp( TS_MW, $row->fa_deleted_timestamp ) .
1869                                                         '!' . $row->fa_name;
1870                                         }
1871                                         $destDir = wfImageArchiveDir( $row->fa_name );
1872                                         if ( !is_dir( $destDir ) ) {
1873                                                 wfMkdirParents( $destDir );
1874                                         }
1875                                         $destPath = $destDir . DIRECTORY_SEPARATOR . $archiveName;
1876
1877                                         $table = 'oldimage';
1878                                         $fields = array(
1879                                                 'oi_name'         => $row->fa_name,
1880                                                 'oi_archive_name' => $archiveName,
1881                                                 'oi_size'         => $row->fa_size,
1882                                                 'oi_width'        => $row->fa_width,
1883                                                 'oi_height'       => $row->fa_height,
1884                                                 'oi_bits'         => $row->fa_bits,
1885                                                 'oi_description'  => $row->fa_description,
1886                                                 'oi_user'         => $row->fa_user,
1887                                                 'oi_user_text'    => $row->fa_user_text,
1888                                                 'oi_timestamp'    => $row->fa_timestamp );
1889                                 }
1890
1891                                 $dbw->insert( $table, $fields, __METHOD__ );
1892                                 // @todo this delete is not totally safe, potentially
1893                                 $dbw->delete( 'filearchive',
1894                                         array( 'fa_id' => $row->fa_id ),
1895                                         __METHOD__ );
1896
1897                                 // Check if any other stored revisions use this file;
1898                                 // if so, we shouldn't remove the file from the deletion
1899                                 // archives so they will still work.
1900                                 $useCount = $dbw->selectField( 'filearchive',
1901                                         'COUNT(*)',
1902                                         array(
1903                                                 'fa_storage_group' => $row->fa_storage_group,
1904                                                 'fa_storage_key'   => $row->fa_storage_key ),
1905                                         __METHOD__ );
1906                                 if( $useCount == 0 ) {
1907                                         wfDebug( __METHOD__.": nothing else using {$row->fa_storage_key}, will deleting after\n" );
1908                                         $flags = FileStore::DELETE_ORIGINAL;
1909                                 } else {
1910                                         $flags = 0;
1911                                 }
1912
1913                                 $transaction->add( $store->export( $row->fa_storage_key,
1914                                         $destPath, $flags ) );
1915                         }
1916
1917                         $dbw->immediateCommit();
1918                 } catch( MWException $e ) {
1919                         wfDebug( __METHOD__." caught error, aborting\n" );
1920                         $transaction->rollback();
1921                         throw $e;
1922                 }
1923
1924                 $transaction->commit();
1925                 FileStore::unlock();
1926
1927                 if( $revisions > 0 ) {
1928                         if( !$exists ) {
1929                                 wfDebug( __METHOD__." restored $revisions items, creating a new current\n" );
1930
1931                                 // Update site_stats
1932                                 $site_stats = $dbw->tableName( 'site_stats' );
1933                                 $dbw->query( "UPDATE $site_stats SET ss_images=ss_images+1", __METHOD__ );
1934
1935                                 $this->purgeEverything();
1936                         } else {
1937                                 wfDebug( __METHOD__." restored $revisions as archived versions\n" );
1938                                 $this->purgeDescription();
1939                         }
1940                 }
1941
1942                 return $revisions;
1943         }
1944
1945         /**
1946          * Returns 'true' if this image is a multipage document, e.g. a DJVU
1947          * document.
1948          *
1949          * @return Bool
1950          */
1951         function isMultipage() {
1952                 $handler = $this->getHandler();
1953                 return $handler && $handler->isMultiPage();
1954         }
1955
1956         /**
1957          * Returns the number of pages of a multipage document, or NULL for
1958          * documents which aren't multipage documents
1959          */
1960         function pageCount() {
1961                 $handler = $this->getHandler();
1962                 if ( $handler && $handler->isMultiPage() ) {
1963                         return $handler->pageCount( $this );
1964                 } else {
1965                         return null;
1966                 }
1967         }
1968
1969         static function getCommonsDB() {
1970                 static $dbc;
1971                 global $wgLoadBalancer, $wgSharedUploadDBname;
1972                 if ( !isset( $dbc ) ) {
1973                         $i = $wgLoadBalancer->getGroupIndex( 'commons' );
1974                         $dbinfo = $wgLoadBalancer->mServers[$i];
1975                         $dbc = new Database( $dbinfo['host'], $dbinfo['user'],
1976                                 $dbinfo['password'], $wgSharedUploadDBname );
1977                 }
1978                 return $dbc;
1979         }
1980
1981         /**
1982          * Calculate the height of a thumbnail using the source and destination width
1983          */
1984         static function scaleHeight( $srcWidth, $srcHeight, $dstWidth ) {
1985                 // Exact integer multiply followed by division
1986                 if ( $srcWidth == 0 ) {
1987                         return 0;
1988                 } else {
1989                         return round( $srcHeight * $dstWidth / $srcWidth );
1990                 }
1991         }
1992
1993         /**
1994          * Get an image size array like that returned by getimagesize(), or false if it
1995          * can't be determined.
1996          *
1997          * @param string $fileName The filename
1998          * @return array
1999          */
2000         function getImageSize( $fileName ) {
2001                 $handler = $this->getHandler();
2002                 return $handler->getImageSize( $this, $fileName );
2003         }
2004
2005         /**
2006          * Get the thumbnail extension and MIME type for a given source MIME type
2007          * @return array thumbnail extension and MIME type
2008          */
2009         static function getThumbType( $ext, $mime ) {
2010                 $handler = MediaHandler::getHandler( $mime );
2011                 if ( $handler ) {
2012                         return $handler->getThumbType( $ext, $mime );
2013                 } else {
2014                         return array( $ext, $mime );
2015                 }
2016         }
2017
2018 } //class
2019
2020
2021 /**
2022  * @addtogroup Media
2023  */
2024 class ArchivedFile
2025 {
2026         /**
2027          * Returns a file object from the filearchive table
2028          * In the future, all current and old image storage
2029          * may use FileStore. There will be a "old" storage
2030          * for current and previous file revisions as well as
2031          * the "deleted" group for archived revisions
2032          * @param $title, the corresponding image page title
2033          * @param $id, the image id, a unique key
2034          * @param $key, optional storage key
2035          * @return ResultWrapper
2036          */
2037         function ArchivedFile( $title, $id=0, $key='' ) {
2038                 if( !is_object( $title ) ) {
2039                         throw new MWException( 'Image constructor given bogus title.' );
2040                 }
2041                 $conds = ($id) ? "fa_id = $id" : "fa_storage_key = '$key'";
2042                 if( $title->getNamespace() == NS_IMAGE ) {
2043                         $dbr = wfGetDB( DB_SLAVE );
2044                         $res = $dbr->select( 'filearchive',
2045                                 array(
2046                                         'fa_id',
2047                                         'fa_name',
2048                                         'fa_storage_key',
2049                                         'fa_storage_group',
2050                                         'fa_size',
2051                                         'fa_bits',
2052                                         'fa_width',
2053                                         'fa_height',
2054                                         'fa_metadata',
2055                                         'fa_media_type',
2056                                         'fa_major_mime',
2057                                         'fa_minor_mime',
2058                                         'fa_description',
2059                                         'fa_user',
2060                                         'fa_user_text',
2061                                         'fa_timestamp',
2062                                         'fa_deleted' ),
2063                                 array(
2064                                         'fa_name' => $title->getDbKey(),
2065                                         $conds ),
2066                                 __METHOD__,
2067                                 array( 'ORDER BY' => 'fa_timestamp DESC' ) );
2068
2069                         if ( $dbr->numRows( $res ) == 0 ) {
2070                         // this revision does not exist?
2071                                 return;
2072                         }
2073                         $ret = $dbr->resultObject( $res );
2074                         $row = $ret->fetchObject();
2075
2076                         // initialize fields for filestore image object
2077                         $this->mId = intval($row->fa_id);
2078                         $this->mName = $row->fa_name;
2079                         $this->mGroup = $row->fa_storage_group;
2080                         $this->mKey = $row->fa_storage_key;
2081                         $this->mSize = $row->fa_size;
2082                         $this->mBits = $row->fa_bits;
2083                         $this->mWidth = $row->fa_width;
2084                         $this->mHeight = $row->fa_height;
2085                         $this->mMetaData = $row->fa_metadata;
2086                         $this->mMime = "$row->fa_major_mime/$row->fa_minor_mime";
2087                         $this->mType = $row->fa_media_type;
2088                         $this->mDescription = $row->fa_description;
2089                         $this->mUser = $row->fa_user;
2090                         $this->mUserText = $row->fa_user_text;
2091                         $this->mTimestamp = $row->fa_timestamp;
2092                         $this->mDeleted = $row->fa_deleted;
2093                 } else {
2094                         throw new MWException( 'This title does not correspond to an image page.' );
2095                         return;
2096                 }
2097                 return true;
2098         }
2099
2100         /**
2101          * int $field one of DELETED_* bitfield constants
2102          * for file or revision rows
2103          * @return bool
2104          */
2105         function isDeleted( $field ) {
2106                 return ($this->mDeleted & $field) == $field;
2107         }
2108
2109         /**
2110          * Determine if the current user is allowed to view a particular
2111          * field of this FileStore image file, if it's marked as deleted.
2112          * @param int $field
2113          * @return bool
2114          */
2115         function userCan( $field ) {
2116                 if( isset($this->mDeleted) && ($this->mDeleted & $field) == $field ) {
2117                 // images
2118                         global $wgUser;
2119                         $permission = ( $this->mDeleted & Revision::DELETED_RESTRICTED ) == Revision::DELETED_RESTRICTED
2120                                 ? 'hiderevision'
2121                                 : 'deleterevision';
2122                         wfDebug( "Checking for $permission due to $field match on $this->mDeleted\n" );
2123                         return $wgUser->isAllowed( $permission );
2124                 } else {
2125                         return true;
2126                 }
2127         }
2128 }
2129
2130 /**
2131  * Aliases for backwards compatibility with 1.6
2132  */
2133 define( 'MW_IMG_DELETED_FILE', Image::DELETED_FILE );
2134 define( 'MW_IMG_DELETED_COMMENT', Image::DELETED_COMMENT );
2135 define( 'MW_IMG_DELETED_USER', Image::DELETED_USER );
2136 define( 'MW_IMG_DELETED_RESTRICTED', Image::DELETED_RESTRICTED );
2137
2138 ?>