includes/Image.php

   1 <?php
   2 /**
   3  * @package MediaWiki
   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 if ($wgShowEXIF)
  14         require_once('Exif.php');
  15
  16
  17 /**
  18  * Class to represent an image
  19  *
  20  * Provides methods to retrieve paths (physical, logical, URL),
  21  * to generate thumbnails or for uploading.
  22  * @package MediaWiki
  23  */
  24 class Image
  25 {
  26         /**#@+
  27          * @access private
  28          */
  29         var     $name,          # name of the image (constructor)
  30                 $imagePath,     # Path of the image (loadFromXxx)
  31                 $url,           # Image URL (accessor)
  32                 $title,         # Title object for this image (constructor)
  33                 $fileExists,    # does the image file exist on disk? (loadFromXxx)
  34                 $fromSharedDirectory, # load this image from $wgSharedUploadDirectory (loadFromXxx)
  35                 $historyLine,   # Number of line to return by nextHistoryLine() (constructor)
  36                 $historyRes,    # result of the query for the image's history (nextHistoryLine)
  37                 $width,         # \
  38                 $height,        #  |
  39                 $bits,          #   --- returned by getimagesize (loadFromXxx)
  40                 $attr,          # /
  41                 $type,          # MEDIATYPE_xxx (bitmap, drawing, audio...)
  42                 $mime,          # MIME type, determined by MimeMagic::guessMimeType
  43                 $size,          # Size in bytes (loadFromXxx)
  44                 $metadata,      # Metadata
  45                 $exif,          # The Exif class
  46                 $dataLoaded;    # Whether or not all this has been loaded from the database (loadFromXxx)
  47
  48
  49         /**#@-*/
  50
  51         /**
  52          * Create an Image object from an image name
  53          *
  54          * @param string $name name of the image, used to create a title object using Title::makeTitleSafe
  55          * @access public
  56          */
  57         function newFromName( $name ) {
  58                 $title = Title::makeTitleSafe( NS_IMAGE, $name );
  59                 return new Image( $title );
  60         }
  61
  62         /**
  63          * Obsolete factory function, use constructor
  64          */
  65         function newFromTitle( $title ) {
  66                 return new Image( $title );
  67         }
  68
  69         function Image( $title ) {
  70                 global $wgShowEXIF;
  71
  72                 if( !is_object( $title ) ) {
  73                         wfDebugDieBacktrace( 'Image constructor given bogus title.' );
  74                 }
  75                 $this->title =& $title;
  76                 $this->name = $title->getDBkey();
  77                 $this->metadata = serialize ( array() ) ;
  78
  79                 $n = strrpos( $this->name, '.' );
  80                 $this->extension = strtolower( $n ? substr( $this->name, $n + 1 ) : '' );
  81                 $this->historyLine = 0;
  82
  83                 $this->dataLoaded = false;
  84
  85                 if ($wgShowEXIF)
  86                         $this->exif = new Exif;
  87         }
  88
  89         /**
  90          * Get the memcached keys
  91          * Returns an array, first element is the local cache key, second is the shared cache key, if there is one
  92          */
  93         function getCacheKeys( $shared = false ) {
  94                 global $wgDBname, $wgUseSharedUploads, $wgSharedUploadDBname, $wgCacheSharedUploads;
  95
  96                 $foundCached = false;
  97                 $hashedName = md5($this->name);
  98                 $keys = array( "$wgDBname:Image:$hashedName" );
  99                 if ( $wgUseSharedUploads && $wgSharedUploadDBname && $wgCacheSharedUploads ) {
 100                         $keys[] = "$wgSharedUploadDBname:Image:$hashedName";
 101                 }
 102                 return $keys;
 103         }
 104
 105         /**
 106          * Try to load image metadata from memcached. Returns true on success.
 107          */
 108         function loadFromCache() {
 109                 global $wgUseSharedUploads, $wgMemc;
 110                 $fname = 'Image::loadFromMemcached';
 111                 wfProfileIn( $fname );
 112                 $this->dataLoaded = false;
 113                 $keys = $this->getCacheKeys();
 114                 $cachedValues = $wgMemc->get( $keys[0] );
 115
 116                 // Check if the key existed and belongs to this version of MediaWiki
 117                 if (!empty($cachedValues) && is_array($cachedValues) && isset($cachedValues['width'])
 118                   && $cachedValues['fileExists'] && isset( $cachedValues['mime'] ) && isset( $cachedValues['metadata'] ) )
 119                 {
 120                         if ( $wgUseSharedUploads && $cachedValues['fromShared']) {
 121                                 # if this is shared file, we need to check if image
 122                                 # in shared repository has not changed
 123                                 if ( isset( $keys[1] ) ) {
 124                                         $commonsCachedValues = $wgMemc->get( $keys[1] );
 125                                         if (!empty($commonsCachedValues) && is_array($commonsCachedValues) && isset($commonsCachedValues['mime'])) {
 126                                                 $this->name = $commonsCachedValues['name'];
 127                                                 $this->imagePath = $commonsCachedValues['imagePath'];
 128                                                 $this->fileExists = $commonsCachedValues['fileExists'];
 129                                                 $this->width = $commonsCachedValues['width'];
 130                                                 $this->height = $commonsCachedValues['height'];
 131                                                 $this->bits = $commonsCachedValues['bits'];
 132                                                 $this->type = $commonsCachedValues['type'];
 133                                                 $this->mime = $commonsCachedValues['mime'];
 134                                                 $this->metadata = $commonsCachedValues['metadata'];
 135                                                 $this->size = $commonsCachedValues['size'];
 136                                                 $this->fromSharedDirectory = true;
 137                                                 $this->dataLoaded = true;
 138                                                 $this->imagePath = $this->getFullPath(true);
 139                                         }
 140                                 }
 141                         }
 142                         else {
 143                                 $this->name = $cachedValues['name'];
 144                                 $this->imagePath = $cachedValues['imagePath'];
 145                                 $this->fileExists = $cachedValues['fileExists'];
 146                                 $this->width = $cachedValues['width'];
 147                                 $this->height = $cachedValues['height'];
 148                                 $this->bits = $cachedValues['bits'];
 149                                 $this->type = $cachedValues['type'];
 150                                 $this->mime = $cachedValues['mime'];
 151                                 $this->metadata = $cachedValues['metadata'];
 152                                 $this->size = $cachedValues['size'];
 153                                 $this->fromSharedDirectory = false;
 154                                 $this->dataLoaded = true;
 155                                 $this->imagePath = $this->getFullPath();
 156                         }
 157                 }
 158                 if ( $this->dataLoaded ) {
 159                         wfIncrStats( 'image_cache_hit' );
 160                 } else {
 161                         wfIncrStats( 'image_cache_miss' );
 162                 }
 163
 164                 wfProfileOut( $fname );
 165                 return $this->dataLoaded;
 166         }
 167
 168         /**
 169          * Save the image metadata to memcached
 170          */
 171         function saveToCache() {
 172                 global $wgMemc;
 173                 $this->load();
 174                 // We can't cache metadata for non-existent files, because if the file later appears
 175                 // in commons, the local keys won't be purged.
 176                 if ( $this->fileExists ) {
 177                         $keys = $this->getCacheKeys();
 178
 179                         $cachedValues = array('name' => $this->name,
 180                                                                   'imagePath' => $this->imagePath,
 181                                                                   'fileExists' => $this->fileExists,
 182                                                                   'fromShared' => $this->fromSharedDirectory,
 183                                                                   'width' => $this->width,
 184                                                                   'height' => $this->height,
 185                                                                   'bits' => $this->bits,
 186                                                                   'type' => $this->type,
 187                                                                   'mime' => $this->mime,
 188                                                                   'metadata' => $this->metadata,
 189                                                                   'size' => $this->size);
 190
 191                         $wgMemc->set( $keys[0], $cachedValues );
 192                 }
 193         }
 194
 195         /**
 196          * Load metadata from the file itself
 197          */
 198         function loadFromFile() {
 199                 global $wgUseSharedUploads, $wgSharedUploadDirectory, $wgLang,
 200                        $wgShowEXIF;
 201                 $fname = 'Image::loadFromFile';
 202                 wfProfileIn( $fname );
 203                 $this->imagePath = $this->getFullPath();
 204                 $this->fileExists = file_exists( $this->imagePath );
 205                 $this->fromSharedDirectory = false;
 206                 $gis = array();
 207
 208                 if (!$this->fileExists) wfDebug("$fname: ".$this->imagePath." not found locally!\n");
 209
 210                 # If the file is not found, and a shared upload directory is used, look for it there.
 211                 if (!$this->fileExists && $wgUseSharedUploads && $wgSharedUploadDirectory) {
 212                         # In case we're on a wgCapitalLinks=false wiki, we
 213                         # capitalize the first letter of the filename before
 214                         # looking it up in the shared repository.
 215                         $sharedImage = Image::newFromName( $wgLang->ucfirst($this->name) );
 216                         $this->fileExists = file_exists( $sharedImage->getFullPath(true) );
 217                         if ( $this->fileExists ) {
 218                                 $this->name = $sharedImage->name;
 219                                 $this->imagePath = $this->getFullPath(true);
 220                                 $this->fromSharedDirectory = true;
 221                         }
 222                 }
 223
 224
 225                 if ( $this->fileExists ) {
 226                         $magic=& wfGetMimeMagic();
 227
 228                         $this->mime = $magic->guessMimeType($this->imagePath,true);
 229                         $this->type = $magic->getMediaType($this->imagePath,$this->mime);
 230
 231                         # Get size in bytes
 232                         $this->size = filesize( $this->imagePath );
 233
 234                         $magic=& wfGetMimeMagic();
 235
 236                         # Height and width
 237                         if( $this->mime == 'image/svg' ) {
 238                                 wfSuppressWarnings();
 239                                 $gis = wfGetSVGsize( $this->imagePath );
 240                                 wfRestoreWarnings();
 241                         }
 242                         elseif ( !$magic->isPHPImageType( $this->mime ) ) {
 243                                 # Don't try to get the width and height of sound and video files, that's bad for performance
 244                                 $gis[0]= 0; //width
 245                                 $gis[1]= 0; //height
 246                                 $gis[2]= 0; //unknown
 247                                 $gis[3]= ""; //width height string
 248                         }
 249                         else {
 250                                 wfSuppressWarnings();
 251                                 $gis = getimagesize( $this->imagePath );
 252                                 wfRestoreWarnings();
 253                         }
 254
 255                         wfDebug("$fname: ".$this->imagePath." loaded, ".$this->size." bytes, ".$this->mime.".\n");
 256                 }
 257                 else {
 258                         $gis[0]= 0; //width
 259                         $gis[1]= 0; //height
 260                         $gis[2]= 0; //unknown
 261                         $gis[3]= ""; //width height string
 262
 263                         $this->mime = NULL;
 264                         $this->type = MEDIATYPE_UNKNOWN;
 265                         wfDebug("$fname: ".$this->imagePath." NOT FOUND!\n");
 266                 }
 267
 268                 $this->width = $gis[0];
 269                 $this->height = $gis[1];
 270
 271                 #NOTE: $gis[2] contains a code for the image type. This is no longer used.
 272
 273                 #NOTE: we have to set this flag early to avoid load() to be called
 274                 # be some of the functions below. This may lead to recursion or other bad things!
 275                 # as ther's only one thread of execution, this should be safe anyway.
 276                 $this->dataLoaded = true;
 277
 278
 279                 if ($this->fileExists && $wgShowEXIF) $this->metadata = serialize ( $this->retrieveExifData() ) ;
 280                 else $this->metadata = serialize ( array() ) ;
 281
 282                 if ( isset( $gis['bits'] ) )  $this->bits = $gis['bits'];
 283                 else $this->bits = 0;
 284
 285                 wfProfileOut( $fname );
 286         }
 287
 288         /**
 289          * Load image metadata from the DB
 290          */
 291         function loadFromDB() {
 292                 global $wgUseSharedUploads, $wgSharedUploadDBname, $wgLang;
 293                 $fname = 'Image::loadFromDB';
 294                 wfProfileIn( $fname );
 295
 296                 $dbr =& wfGetDB( DB_SLAVE );
 297
 298                 $this->checkDBSchema($dbr);
 299
 300                 $row = $dbr->selectRow( 'image',
 301                         array( 'img_size', 'img_width', 'img_height', 'img_bits',
 302                                'img_media_type', 'img_major_mime', 'img_minor_mime', 'img_metadata' ),
 303                         array( 'img_name' => $this->name ), $fname );
 304                 if ( $row ) {
 305                         $this->fromSharedDirectory = false;
 306                         $this->fileExists = true;
 307                         $this->loadFromRow( $row );
 308                         $this->imagePath = $this->getFullPath();
 309                         // Check for rows from a previous schema, quietly upgrade them
 310                         if ( is_null($this->type) ) {
 311                                 $this->upgradeRow();
 312                         }
 313                 } elseif ( $wgUseSharedUploads && $wgSharedUploadDBname ) {
 314                         # In case we're on a wgCapitalLinks=false wiki, we
 315                         # capitalize the first letter of the filename before
 316                         # looking it up in the shared repository.
 317                         $name = $wgLang->ucfirst($this->name);
 318
 319                         $row = $dbr->selectRow( "`$wgSharedUploadDBname`.image",
 320                                 array(
 321                                         'img_size', 'img_width', 'img_height', 'img_bits',
 322                                         'img_media_type', 'img_major_mime', 'img_minor_mime', 'img_metadata' ),
 323                                 array( 'img_name' => $name ), $fname );
 324                         if ( $row ) {
 325                                 $this->fromSharedDirectory = true;
 326                                 $this->fileExists = true;
 327                                 $this->imagePath = $this->getFullPath(true);
 328                                 $this->name = $name;
 329                                 $this->loadFromRow( $row );
 330
 331                                 // Check for rows from a previous schema, quietly upgrade them
 332                                 if ( is_null($this->type) ) {
 333                                         $this->upgradeRow();
 334                                 }
 335                         }
 336                 }
 337
 338                 if ( !$row ) {
 339                         $this->size = 0;
 340                         $this->width = 0;
 341                         $this->height = 0;
 342                         $this->bits = 0;
 343                         $this->type = 0;
 344                         $this->fileExists = false;
 345                         $this->fromSharedDirectory = false;
 346                         $this->metadata = serialize ( array() ) ;
 347                 }
 348
 349                 # Unconditionally set loaded=true, we don't want the accessors constantly rechecking
 350                 $this->dataLoaded = true;
 351                 wfProfileOut( $fname );
 352         }
 353
 354         /*
 355          * Load image metadata from a DB result row
 356          */
 357         function loadFromRow( &$row ) {
 358                 $this->size = $row->img_size;
 359                 $this->width = $row->img_width;
 360                 $this->height = $row->img_height;
 361                 $this->bits = $row->img_bits;
 362                 $this->type = $row->img_media_type;
 363
 364                 $major= $row->img_major_mime;
 365                 $minor= $row->img_minor_mime;
 366
 367                 if (!$major) $this->mime = "unknown/unknown";
 368                 else {
 369                         if (!$minor) $minor= "unknown";
 370                         $this->mime = $major.'/'.$minor;
 371                 }
 372
 373                 $this->metadata = $row->img_metadata;
 374                 if ( $this->metadata == "" ) $this->metadata = serialize ( array() ) ;
 375
 376                 $this->dataLoaded = true;
 377         }
 378
 379         /**
 380          * Load image metadata from cache or DB, unless already loaded
 381          */
 382         function load() {
 383                 global $wgSharedUploadDBname, $wgUseSharedUploads;
 384                 if ( !$this->dataLoaded ) {
 385                         if ( !$this->loadFromCache() ) {
 386                                 $this->loadFromDB();
 387                                 if ( !$wgSharedUploadDBname && $wgUseSharedUploads ) {
 388                                         $this->loadFromFile();
 389                                 } elseif ( $this->fileExists ) {
 390                                         $this->saveToCache();
 391                                 }
 392                         }
 393                         $this->dataLoaded = true;
 394                 }
 395         }
 396
 397         /**
 398          * Metadata was loaded from the database, but the row had a marker indicating it needs to be
 399          * upgraded from the 1.4 schema, which had no width, height, bits or type. Upgrade the row.
 400          */
 401         function upgradeRow() {
 402                 global $wgDBname, $wgSharedUploadDBname;
 403                 $fname = 'Image::upgradeRow';
 404                 wfProfileIn( $fname );
 405
 406                 $this->loadFromFile();
 407                 $dbw =& wfGetDB( DB_MASTER );
 408
 409                 if ( $this->fromSharedDirectory ) {
 410                         if ( !$wgSharedUploadDBname ) {
 411                                 wfProfileOut( $fname );
 412                                 return;
 413                         }
 414
 415                         // Write to the other DB using selectDB, not database selectors
 416                         // This avoids breaking replication in MySQL
 417                         $dbw->selectDB( $wgSharedUploadDBname );
 418                 }
 419
 420                 $this->checkDBSchema($dbw);
 421
 422                 if (strpos($this->mime,'/')!==false) {
 423                         list($major,$minor)= explode('/',$this->mime,2);
 424                 }
 425                 else {
 426                         $major= $this->mime;
 427                         $minor= "unknown";
 428                 }
 429
 430                 wfDebug("$fname: upgrading ".$this->name." to 1.5 schema\n");
 431
 432                 $dbw->update( 'image',
 433                         array(
 434                                 'img_width' => $this->width,
 435                                 'img_height' => $this->height,
 436                                 'img_bits' => $this->bits,
 437                                 'img_media_type' => $this->type,
 438                                 'img_major_mime' => $major,
 439                                 'img_minor_mime' => $minor,
 440                                 'img_metadata' => $this->metadata,
 441                         ), array( 'img_name' => $this->name ), $fname
 442                 );
 443                 if ( $this->fromSharedDirectory ) {
 444                         $dbw->selectDB( $wgDBname );
 445                 }
 446                 wfProfileOut( $fname );
 447         }
 448
 449         /**
 450          * Return the name of this image
 451          * @access public
 452          */
 453         function getName() {
 454                 return $this->name;
 455         }
 456
 457         /**
 458          * Return the associated title object
 459          * @access public
 460          */
 461         function getTitle() {
 462                 return $this->title;
 463         }
 464
 465         /**
 466          * Return the URL of the image file
 467          * @access public
 468          */
 469         function getURL() {
 470                 if ( !$this->url ) {
 471                         $this->load();
 472                         if($this->fileExists) {
 473                                 $this->url = Image::imageUrl( $this->name, $this->fromSharedDirectory );
 474                         } else {
 475                                 $this->url = '';
 476                         }
 477                 }
 478                 return $this->url;
 479         }
 480
 481         function getViewURL() {
 482                 if( $this->mustRender()) {
 483                         if( $this->canRender() ) {
 484                                 return $this->createThumb( $this->getWidth() );
 485                         }
 486                         else {
 487                                 wfDebug('Image::getViewURL(): supposed to render '.$this->name.' ('.$this->mime."), but can't!\n");
 488                                 return $this->getURL(); #hm... return NULL?
 489                         }
 490                 } else {
 491                         return $this->getURL();
 492                 }
 493         }
 494
 495         /**
 496          * Return the image path of the image in the
 497          * local file system as an absolute path
 498          * @access public
 499          */
 500         function getImagePath() {
 501                 $this->load();
 502                 return $this->imagePath;
 503         }
 504
 505         /**
 506          * Return the width of the image
 507          *
 508          * Returns -1 if the file specified is not a known image type
 509          * @access public
 510          */
 511         function getWidth() {
 512                 $this->load();
 513                 return $this->width;
 514         }
 515
 516         /**
 517          * Return the height of the image
 518          *
 519          * Returns -1 if the file specified is not a known image type
 520          * @access public
 521          */
 522         function getHeight() {
 523                 $this->load();
 524                 return $this->height;
 525         }
 526
 527         /**
 528          * Return the size of the image file, in bytes
 529          * @access public
 530          */
 531         function getSize() {
 532                 $this->load();
 533                 return $this->size;
 534         }
 535
 536         /**
 537          * Returns the mime type of the file.
 538          */
 539         function getMimeType() {
 540                 $this->load();
 541                 return $this->mime;
 542         }
 543
 544         /**
 545          * Return the type of the media in the file.
 546          * Use the value returned by this function with the MEDIATYPE_xxx constants.
 547          */
 548         function getMediaType() {
 549                 $this->load();
 550                 return $this->type;
 551         }
 552
 553         /**
 554          * Checks if the file can be presented to the browser as a bitmap.
 555          *
 556          * Currently, this checks if the file is an image format
 557          * that can be converted to a format
 558          * supported by all browsers (namely GIF, PNG and JPEG),
 559          * or if it is an SVG image and SVG conversion is enabled.
 560          *
 561          * @todo remember the result of this check.
 562          */
 563         function canRender() {
 564                 global $wgUseImageMagick;
 565
 566                 if( $this->getWidth()<=0 || $this->getHeight()<=0 ) return false;
 567
 568                 $mime= $this->getMimeType();
 569
 570                 if (!$mime || $mime==='unknown' || $mime==='unknown/unknown') return false;
 571
 572                 #if it's SVG, check if ther's a converter enabled
 573                 if ($mime === 'image/svg') {
 574                         global $wgSVGConverters, $wgSVGConverter;
 575
 576                         if ($wgSVGConverter && isset( $wgSVGConverters[$wgSVGConverter])) {
 577                                 return true;
 578                         }
 579                 }
 580
 581                 #image formats available on ALL browsers
 582                 if (  $mime === 'image/gif'
 583                    || $mime === 'image/png'
 584                    || $mime === 'image/jpeg' ) return true;
 585
 586                 #image formats that can be converted to the above formats
 587                 if ($wgUseImageMagick) {
 588                         #convertable by ImageMagick (there are more...)
 589                         if ( $mime === 'image/vnd.wap.wbmp'
 590                           || $mime === 'image/x-xbitmap'
 591                           || $mime === 'image/x-xpixmap'
 592                           #|| $mime === 'image/x-icon'   #file may be split into multiple parts
 593                           || $mime === 'image/x-portable-anymap'
 594                           || $mime === 'image/x-portable-bitmap'
 595                           || $mime === 'image/x-portable-graymap'
 596                           || $mime === 'image/x-portable-pixmap'
 597                           #|| $mime === 'image/x-photoshop'  #this takes a lot of CPU and RAM!
 598                           || $mime === 'image/x-rgb'
 599                           || $mime === 'image/x-bmp'
 600                           || $mime === 'image/tiff' ) return true;
 601                 }
 602                 else {
 603                         #convertable by the PHP GD image lib
 604                         if ( $mime === 'image/vnd.wap.wbmp'
 605                           || $mime === 'image/x-xbitmap' ) return true;
 606                 }
 607
 608                 return false;
 609         }
 610
 611
 612         /**
 613          * Return true if the file is of a type that can't be directly
 614          * rendered by typical browsers and needs to be re-rasterized.
 615          *
 616          * This returns true for everything but the bitmap types
 617          * supported by all browsers, i.e. JPEG; GIF and PNG. It will
 618          * also return true for any non-image formats.
 619          *
 620          * @return bool
 621          */
 622         function mustRender() {
 623                 $mime= $this->getMimeType();
 624
 625                 if (  $mime === "image/gif"
 626                    || $mime === "image/png"
 627                    || $mime === "image/jpeg" ) return false;
 628
 629                 return true;
 630         }
 631
 632         /**
 633          * Determines if this media file may be shown inline on a page.
 634          *
 635          * This is currently synonymous to canRender(), but this could be
 636          * extended to also allow inline display of other media,
 637          * like flash animations or videos. If you do so, please keep in mind that
 638          * that could be a security risk.
 639          */
 640         function allowInlineDisplay() {
 641                 return $this->canRender();
 642         }
 643
 644         /**
 645          * Determines if this media file is in a format that is unlikely to
 646          * contain viruses or malicious content. It uses the global
 647          * $wgTrustedMediaFormats list to determine if the file is safe.
 648          *
 649          * This is used to show a warning on the description page of non-safe files.
 650          * It may also be used to disallow direct [[media:...]] links to such files.
 651          *
 652          * Note that this function will always return ture if allowInlineDisplay()
 653          * or isTrustedFile() is true for this file.
 654          */
 655         function isSafeFile() {
 656                 if ($this->allowInlineDisplay()) return true;
 657                 if ($this->isTrustedFile()) return true;
 658
 659                 global $wgTrustedMediaFormats;
 660
 661                 $type= $this->getMediaType();
 662                 $mime= $this->getMimeType();
 663                 #wfDebug("Image::isSafeFile: type= $type, mime= $mime\n");
 664
 665                 if (!$type || $type===MEDIATYPE_UNKNOWN) return false; #unknown type, not trusted
 666                 if ( in_array( $type, $wgTrustedMediaFormats) ) return true;
 667
 668                 if ($mime==="unknown/unknown") return false; #unknown type, not trusted
 669                 if ( in_array( $mime, $wgTrustedMediaFormats) ) return true;
 670
 671                 return false;
 672         }
 673
 674         /** Returns true if the file is flagegd as trusted. Files flagged that way
 675         * can be linked to directly, even if that is not allowed for this type of
 676         * file normally.
 677         *
 678         * This is a dummy function right now and always returns false. It could be
 679         * implemented to extract a flag from the database. The trusted flag could be
 680         * set on upload, if the user has sufficient privileges, to bypass script-
 681         * and html-filters. It may even be coupeled with cryptographics signatures
 682         * or such.
 683         */
 684         function isTrustedFile() {
 685                 #this could be implemented to check a flag in the databas,
 686                 #look for signatures, etc
 687                 return false;
 688         }
 689
 690         /**
 691          * Return the escapeLocalURL of this image
 692          * @access public
 693          */
 694         function getEscapeLocalURL() {
 695                 $this->getTitle();
 696                 return $this->title->escapeLocalURL();
 697         }
 698
 699         /**
 700          * Return the escapeFullURL of this image
 701          * @access public
 702          */
 703         function getEscapeFullURL() {
 704                 $this->getTitle();
 705                 return $this->title->escapeFullURL();
 706         }
 707
 708         /**
 709          * Return the URL of an image, provided its name.
 710          *
 711          * @param string $name  Name of the image, without the leading "Image:"
 712          * @param boolean $fromSharedDirectory  Should this be in $wgSharedUploadPath?
 713          * @return string URL of $name image
 714          * @access public
 715          * @static
 716          */
 717         function imageUrl( $name, $fromSharedDirectory = false ) {
 718                 global $wgUploadPath,$wgUploadBaseUrl,$wgSharedUploadPath;
 719                 if($fromSharedDirectory) {
 720                         $base = '';
 721                         $path = $wgSharedUploadPath;
 722                 } else {
 723                         $base = $wgUploadBaseUrl;
 724                         $path = $wgUploadPath;
 725                 }
 726                 $url = "{$base}{$path}" .  wfGetHashPath($name, $fromSharedDirectory) . "{$name}";
 727                 return wfUrlencode( $url );
 728         }
 729
 730         /**
 731          * Returns true if the image file exists on disk.
 732          * @return boolean Whether image file exist on disk.
 733          * @access public
 734          */
 735         function exists() {
 736                 $this->load();
 737                 return $this->fileExists;
 738         }
 739
 740         /**
 741          * @todo document
 742          * @access private
 743          */
 744         function thumbUrl( $width, $subdir='thumb') {
 745                 global $wgUploadPath, $wgUploadBaseUrl,
 746                        $wgSharedUploadPath,$wgSharedUploadDirectory,
 747                            $wgSharedThumbnailScriptPath, $wgThumbnailScriptPath;
 748
 749                 // Generate thumb.php URL if possible
 750                 $script = false;
 751                 $url = false;
 752
 753                 if ( $this->fromSharedDirectory ) {
 754                         if ( $wgSharedThumbnailScriptPath ) {
 755                                 $script = $wgSharedThumbnailScriptPath;
 756                         }
 757                 } else {
 758                         if ( $wgThumbnailScriptPath ) {
 759                                 $script = $wgThumbnailScriptPath;
 760                         }
 761                 }
 762                 if ( $script ) {
 763                         $url = $script . '?f=' . urlencode( $this->name ) . '&w=' . urlencode( $width );
 764                         if( $this->mustRender() ) {
 765                                 $url.= '&r=1';
 766                         }
 767                 } else {
 768                         $name = $this->thumbName( $width );
 769                         if($this->fromSharedDirectory) {
 770                                 $base = '';
 771                                 $path = $wgSharedUploadPath;
 772                         } else {
 773                                 $base = $wgUploadBaseUrl;
 774                                 $path = $wgUploadPath;
 775                         }
 776                         if ( Image::isHashed( $this->fromSharedDirectory ) ) {
 777                                 $url = "{$base}{$path}/{$subdir}" .
 778                                 wfGetHashPath($this->name, $this->fromSharedDirectory)
 779                                 . $this->name.'/'.$name;
 780                                 $url = wfUrlencode( $url );
 781                         } else {
 782                                 $url = "{$base}{$path}/{$subdir}/{$name}";
 783                         }
 784                 }
 785                 return array( $script !== false, $url );
 786         }
 787
 788         /**
 789          * Return the file name of a thumbnail of the specified width
 790          *
 791          * @param integer $width        Width of the thumbnail image
 792          * @param boolean $shared       Does the thumbnail come from the shared repository?
 793          * @access private
 794          */
 795         function thumbName( $width ) {
 796                 $thumb = $width."px-".$this->name;
 797
 798                 if( $this->mustRender() ) {
 799                         if( $this->canRender() ) {
 800                                 # Rasterize to PNG (for SVG vector images, etc)
 801                                 $thumb .= '.png';
 802                         }
 803                         else {
 804                                 #should we use iconThumb here to get a symbolic thumbnail?
 805                                 #or should we fail with an internal error?
 806                                 return NULL; //can't make bitmap
 807                         }
 808                 }
 809                 return $thumb;
 810         }
 811
 812         /**
 813          * Create a thumbnail of the image having the specified width/height.
 814          * The thumbnail will not be created if the width is larger than the
 815          * image's width. Let the browser do the scaling in this case.
 816          * The thumbnail is stored on disk and is only computed if the thumbnail
 817          * file does not exist OR if it is older than the image.
 818          * Returns the URL.
 819          *
 820          * Keeps aspect ratio of original image. If both width and height are
 821          * specified, the generated image will be no bigger than width x height,
 822          * and will also have correct aspect ratio.
 823          *
 824          * @param integer $width        maximum width of the generated thumbnail
 825          * @param integer $height       maximum height of the image (optional)
 826          * @access public
 827          */
 828         function createThumb( $width, $height=-1 ) {
 829                 $thumb = $this->getThumbnail( $width, $height );
 830                 if( is_null( $thumb ) ) return '';
 831                 return $thumb->getUrl();
 832         }
 833
 834         /**
 835          * As createThumb, but returns a ThumbnailImage object. This can
 836          * provide access to the actual file, the real size of the thumb,
 837          * and can produce a convenient <img> tag for you.
 838          *
 839          * @param integer $width        maximum width of the generated thumbnail
 840          * @param integer $height       maximum height of the image (optional)
 841          * @return ThumbnailImage
 842          * @access public
 843          */
 844         function &getThumbnail( $width, $height=-1 ) {
 845                 if ( $height == -1 ) {
 846                         return $this->renderThumb( $width );
 847                 }
 848                 $this->load();
 849
 850                 if ($this->canRender()) {
 851                         if ( $width < $this->width ) {
 852                                 $thumbheight = $this->height * $width / $this->width;
 853                                 $thumbwidth = $width;
 854                         } else {
 855                                 $thumbheight = $this->height;
 856                                 $thumbwidth = $this->width;
 857                         }
 858                         if ( $thumbheight > $height ) {
 859                                 $thumbwidth = $thumbwidth * $height / $thumbheight;
 860                                 $thumbheight = $height;
 861                         }
 862
 863                         $thumb = $this->renderThumb( $thumbwidth );
 864                 }
 865                 else $thumb= NULL; #not a bitmap or renderable image, don't try.
 866
 867                 if( is_null( $thumb ) ) {
 868                         $thumb = $this->iconThumb();
 869                 }
 870                 return $thumb;
 871         }
 872
 873         /**
 874          * @return ThumbnailImage
 875          */
 876         function iconThumb() {
 877                 global $wgStylePath, $wgStyleDirectory;
 878
 879                 $try = array( 'fileicon-' . $this->extension . '.png', 'fileicon.png' );
 880                 foreach( $try as $icon ) {
 881                         $path = '/common/images/icons/' . $icon;
 882                         $filepath = $wgStyleDirectory . $path;
 883                         if( file_exists( $filepath ) ) {
 884                                 return new ThumbnailImage( $wgStylePath . $path, 120, 120 );
 885                         }
 886                 }
 887                 return null;
 888         }
 889
 890         /**
 891          * Create a thumbnail of the image having the specified width.
 892          * The thumbnail will not be created if the width is larger than the
 893          * image's width. Let the browser do the scaling in this case.
 894          * The thumbnail is stored on disk and is only computed if the thumbnail
 895          * file does not exist OR if it is older than the image.
 896          * Returns an object which can return the pathname, URL, and physical
 897          * pixel size of the thumbnail -- or null on failure.
 898          *
 899          * @return ThumbnailImage
 900          * @access private
 901          */
 902         function renderThumb( $width, $useScript = true ) {
 903                 global $wgUseSquid, $wgInternalServer;
 904                 global $wgThumbnailScriptPath, $wgSharedThumbnailScriptPath;
 905
 906                 $width = IntVal( $width );
 907
 908                 $this->load();
 909                 if ( ! $this->exists() )
 910                 {
 911                         # If there is no image, there will be no thumbnail
 912                         return null;
 913                 }
 914
 915                 # Sanity check $width
 916                 if( $width <= 0 || $this->width <= 0) {
 917                         # BZZZT
 918                         return null;
 919                 }
 920
 921                 if( $width >= $this->width && !$this->mustRender() ) {
 922                         # Don't make an image bigger than the source
 923                         return new ThumbnailImage( $this->getViewURL(), $this->getWidth(), $this->getHeight() );
 924                 }
 925
 926                 $height = floor( $this->height * ( $width/$this->width ) );
 927
 928                 list( $isScriptUrl, $url ) = $this->thumbUrl( $width );
 929                 if ( $isScriptUrl && $useScript ) {
 930                         // Use thumb.php to render the image
 931                         return new ThumbnailImage( $url, $width, $height );
 932                 }
 933
 934                 $thumbName = $this->thumbName( $width, $this->fromSharedDirectory );
 935                 $thumbPath = wfImageThumbDir( $this->name, $this->fromSharedDirectory ).'/'.$thumbName;
 936
 937                 if ( !file_exists( $thumbPath ) ) {
 938                         $oldThumbPath = wfDeprecatedThumbDir( $thumbName, 'thumb', $this->fromSharedDirectory ).
 939                                 '/'.$thumbName;
 940                         $done = false;
 941                         if ( file_exists( $oldThumbPath ) ) {
 942                                 if ( filemtime($oldThumbPath) >= filemtime($this->imagePath) ) {
 943                                         rename( $oldThumbPath, $thumbPath );
 944                                         $done = true;
 945                                 } else {
 946                                         unlink( $oldThumbPath );
 947                                 }
 948                         }
 949                         if ( !$done ) {
 950                                 $this->reallyRenderThumb( $thumbPath, $width, $height );
 951
 952                                 # Purge squid
 953                                 # This has to be done after the image is updated and present for all machines on NFS,
 954                                 # or else the old version might be stored into the squid again
 955                                 if ( $wgUseSquid ) {
 956                                         if ( substr( $url, 0, 4 ) == 'http' ) {
 957                                                 $urlArr = array( $url );
 958                                         } else {
 959                                                 $urlArr = array( $wgInternalServer.$url );
 960                                         }
 961                                         wfPurgeSquidServers($urlArr);
 962                                 }
 963                         }
 964                 }
 965
 966                 return new ThumbnailImage( $url, $width, $height, $thumbPath );
 967         } // END OF function renderThumb
 968
 969         /**
 970          * Really render a thumbnail
 971          * Call this only for images for which canRender() returns true.
 972          *
 973          * @access private
 974          */
 975         function reallyRenderThumb( $thumbPath, $width, $height ) {
 976                 global $wgSVGConverters, $wgSVGConverter,
 977                         $wgUseImageMagick, $wgImageMagickConvertCommand;
 978
 979                 $this->load();
 980
 981                 if( $this->mime === "image/svg" ) {
 982                         #Right now we have only SVG
 983
 984                         global $wgSVGConverters, $wgSVGConverter;
 985                         if( isset( $wgSVGConverters[$wgSVGConverter] ) ) {
 986                                 global $wgSVGConverterPath;
 987                                 $cmd = str_replace(
 988                                         array( '$path/', '$width', '$input', '$output' ),
 989                                         array( $wgSVGConverterPath,
 990                                                    $width,
 991                                                    wfEscapeShellArg( $this->imagePath ),
 992                                                    wfEscapeShellArg( $thumbPath ) ),
 993                                         $wgSVGConverters[$wgSVGConverter] );
 994                                 $conv = shell_exec( $cmd );
 995                         } else {
 996                                 $conv = false;
 997                         }
 998                 } elseif ( $wgUseImageMagick ) {
 999                         # use ImageMagick
1000                         # Specify white background color, will be used for transparent images
1001                         # in Internet Explorer/Windows instead of default black.
1002                         $cmd  =  $wgImageMagickConvertCommand .
1003                                 " -quality 85 -background white -geometry {$width} ".
1004                                 wfEscapeShellArg($this->imagePath) . " " .
1005                                 wfEscapeShellArg($thumbPath);
1006                         wfDebug("reallyRenderThumb: running ImageMagick: $cmd");
1007                         $conv = shell_exec( $cmd );
1008                 } else {
1009                         # Use PHP's builtin GD library functions.
1010                         #
1011                         # First find out what kind of file this is, and select the correct
1012                         # input routine for this.
1013
1014                         $truecolor = false;
1015
1016                         switch( $this->type ) {
1017                                 case 1: # GIF
1018                                         $src_image = imagecreatefromgif( $this->imagePath );
1019                                         break;
1020                                 case 2: # JPG
1021                                         $src_image = imagecreatefromjpeg( $this->imagePath );
1022                                         $truecolor = true;
1023                                         break;
1024                                 case 3: # PNG
1025                                         $src_image = imagecreatefrompng( $this->imagePath );
1026                                         $truecolor = ( $this->bits > 8 );
1027                                         break;
1028                                 case 15: # WBMP for WML
1029                                         $src_image = imagecreatefromwbmp( $this->imagePath );
1030                                         break;
1031                                 case 16: # XBM
1032                                         $src_image = imagecreatefromxbm( $this->imagePath );
1033                                         break;
1034                                 default:
1035                                         return 'Image type not supported';
1036                                         break;
1037                         }
1038                         if ( $truecolor ) {
1039                                 $dst_image = imagecreatetruecolor( $width, $height );
1040                         } else {
1041                                 $dst_image = imagecreate( $width, $height );
1042                         }
1043                         imagecopyresampled( $dst_image, $src_image,
1044                                                 0,0,0,0,
1045                                                 $width, $height, $this->width, $this->height );
1046                         switch( $this->type ) {
1047                                 case 1:  # GIF
1048                                 case 3:  # PNG
1049                                 case 15: # WBMP
1050                                 case 16: # XBM
1051                                         imagepng( $dst_image, $thumbPath );
1052                                         break;
1053                                 case 2:  # JPEG
1054                                         imageinterlace( $dst_image );
1055                                         imagejpeg( $dst_image, $thumbPath, 95 );
1056                                         break;
1057                                 default:
1058                                         break;
1059                         }
1060                         imagedestroy( $dst_image );
1061                         imagedestroy( $src_image );
1062                 }
1063
1064                 #
1065                 # Check for zero-sized thumbnails. Those can be generated when
1066                 # no disk space is available or some other error occurs
1067                 #
1068                 if( file_exists( $thumbPath ) ) {
1069                         $thumbstat = stat( $thumbPath );
1070                         if( $thumbstat['size'] == 0 ) {
1071                                 unlink( $thumbPath );
1072                         }
1073                 }
1074         }
1075
1076         /**
1077          * Get all thumbnail names previously generated for this image
1078          */
1079         function getThumbnails( $shared = false ) {
1080                 if ( Image::isHashed( $shared ) ) {
1081                         $this->load();
1082                         $files = array();
1083                         $dir = wfImageThumbDir( $this->name, $shared );
1084
1085                         // This generates an error on failure, hence the @
1086                         $handle = @opendir( $dir );
1087
1088                         if ( $handle ) {
1089                                 while ( false !== ( $file = readdir($handle) ) ) {
1090                                         if ( $file{0} != '.' ) {
1091                                                 $files[] = $file;
1092                                         }
1093                                 }
1094                                 closedir( $handle );
1095                         }
1096                 } else {
1097                         $files = array();
1098                 }
1099
1100                 return $files;
1101         }
1102
1103         /**
1104          * Delete all previously generated thumbnails, refresh metadata in memcached and purge the squid
1105          */
1106         function purgeCache( $archiveFiles = array(), $shared = false ) {
1107                 global $wgInternalServer, $wgUseSquid;
1108
1109                 // Refresh metadata cache
1110                 clearstatcache();
1111                 $this->loadFromFile();
1112                 $this->saveToCache();
1113
1114                 // Delete thumbnails
1115                 $files = $this->getThumbnails( $shared );
1116                 $dir = wfImageThumbDir( $this->name, $shared );
1117                 $urls = array();
1118                 foreach ( $files as $file ) {
1119                         if ( preg_match( '/^(\d+)px/', $file, $m ) ) {
1120                                 $urls[] = $wgInternalServer . $this->thumbUrl( $m[1], $this->fromSharedDirectory );
1121                                 @unlink( "$dir/$file" );
1122                         }
1123                 }
1124
1125                 // Purge the squid
1126                 if ( $wgUseSquid ) {
1127                         $urls[] = $wgInternalServer . $this->getViewURL();
1128                         foreach ( $archiveFiles as $file ) {
1129                                 $urls[] = $wgInternalServer . wfImageArchiveUrl( $file );
1130                         }
1131                         wfPurgeSquidServers( $urls );
1132                 }
1133         }
1134
1135         function checkDBSchema(&$db) {
1136                 # img_name must be unique
1137                 if ( !$db->indexUnique( 'image', 'img_name' ) && !$db->indexExists('image','PRIMARY') ) {
1138                         wfDebugDieBacktrace( 'Database schema not up to date, please run maintenance/archives/patch-image_name_unique.sql' );
1139                 }
1140
1141                 #new fields must exist
1142                 if ( !$db->fieldExists( 'image', 'img_media_type' )
1143                   || !$db->fieldExists( 'image', 'img_metadata' )
1144                   || !$db->fieldExists( 'image', 'img_width' ) ) {
1145
1146                         wfDebugDieBacktrace( 'Database schema not up to date, please run maintenance/update.php' );
1147                 }
1148         }
1149
1150         /**
1151          * Return the image history of this image, line by line.
1152          * starts with current version, then old versions.
1153          * uses $this->historyLine to check which line to return:
1154          *  0      return line for current version
1155          *  1      query for old versions, return first one
1156          *  2, ... return next old version from above query
1157          *
1158          * @access public
1159          */
1160         function nextHistoryLine() {
1161                 $fname = 'Image::nextHistoryLine()';
1162                 $dbr =& wfGetDB( DB_SLAVE );
1163
1164                 $this->checkDBSchema($dbr);
1165
1166                 if ( $this->historyLine == 0 ) {// called for the first time, return line from cur
1167                         $this->historyRes = $dbr->select( 'image',
1168                                 array( 'img_size','img_description','img_user','img_user_text','img_timestamp', "'' AS oi_archive_name" ),
1169                                 array( 'img_name' => $this->title->getDBkey() ),
1170                                 $fname
1171                         );
1172                         if ( 0 == wfNumRows( $this->historyRes ) ) {
1173                                 return FALSE;
1174                         }
1175                 } else if ( $this->historyLine == 1 ) {
1176                         $this->historyRes = $dbr->select( 'oldimage',
1177                                 array( 'oi_size AS img_size', 'oi_description AS img_description', 'oi_user AS img_user',
1178                                         'oi_user_text AS img_user_text', 'oi_timestamp AS img_timestamp', 'oi_archive_name'
1179                                 ), array( 'oi_name' => $this->title->getDBkey() ), $fname, array( 'ORDER BY' => 'oi_timestamp DESC' )
1180                         );
1181                 }
1182                 $this->historyLine ++;
1183
1184                 return $dbr->fetchObject( $this->historyRes );
1185         }
1186
1187         /**
1188          * Reset the history pointer to the first element of the history
1189          * @access public
1190          */
1191         function resetHistory() {
1192                 $this->historyLine = 0;
1193         }
1194
1195         /**
1196         * Return the full filesystem path to the file. Note that this does
1197         * not mean that a file actually exists under that location.
1198         *
1199         * This path depends on whether directory hashing is active or not,
1200         * i.e. whether the images are all found in the same directory,
1201         * or in hashed paths like /images/3/3c.
1202         *
1203         * @access public
1204         * @param boolean $fromSharedDirectory Return the path to the file
1205         *   in a shared repository (see $wgUseSharedRepository and related
1206         *   options in DefaultSettings.php) instead of a local one.
1207         *
1208         */
1209         function getFullPath( $fromSharedRepository = false ) {
1210                 global $wgUploadDirectory, $wgSharedUploadDirectory;
1211                 global $wgHashedUploadDirectory, $wgHashedSharedUploadDirectory;
1212
1213                 $dir      = $fromSharedRepository ? $wgSharedUploadDirectory :
1214                                                     $wgUploadDirectory;
1215
1216                 // $wgSharedUploadDirectory may be false, if thumb.php is used
1217                 if ( $dir ) {
1218                         $fullpath = $dir . wfGetHashPath($this->name, $fromSharedRepository) . $this->name;
1219                 } else {
1220                         $fullpath = false;
1221                 }
1222
1223                 return $fullpath;
1224         }
1225
1226         /**
1227          * @return bool
1228          * @static
1229          */
1230         function isHashed( $shared ) {
1231                 global $wgHashedUploadDirectory, $wgHashedSharedUploadDirectory;
1232                 return $shared ? $wgHashedSharedUploadDirectory : $wgHashedUploadDirectory;
1233         }
1234
1235         /**
1236          * Record an image upload in the upload log and the image table
1237          */
1238         function recordUpload( $oldver, $desc, $copyStatus = '', $source = '' ) {
1239                 global $wgUser, $wgLang, $wgTitle, $wgOut, $wgDeferredUpdateList;
1240                 global $wgUseCopyrightUpload, $wgUseSquid, $wgPostCommitUpdateList;
1241
1242                 $fname = 'Image::recordUpload';
1243                 $dbw =& wfGetDB( DB_MASTER );
1244
1245                 $this->checkDBSchema($dbw);
1246
1247                 // Delete thumbnails and refresh the metadata cache
1248                 $this->purgeCache();
1249
1250                 // Fail now if the image isn't there
1251                 if ( !$this->fileExists || $this->fromSharedDirectory ) {
1252                         wfDebug( "Image::recordUpload: File ".$this->imagePath." went missing!\n" );
1253                         return false;
1254                 }
1255
1256                 if ( $wgUseCopyrightUpload ) {
1257                         $textdesc = '== ' . wfMsg ( 'filedesc' ) . " ==\n" . $desc . "\n" .
1258                           '== ' . wfMsg ( 'filestatus' ) . " ==\n" . $copyStatus . "\n" .
1259                           '== ' . wfMsg ( 'filesource' ) . " ==\n" . $source ;
1260                 } else {
1261                         $textdesc = $desc;
1262                 }
1263
1264                 $now = $dbw->timestamp();
1265
1266                 #split mime type
1267                 if (strpos($this->mime,'/')!==false) {
1268                         list($major,$minor)= explode('/',$this->mime,2);
1269                 }
1270                 else {
1271                         $major= $this->mime;
1272                         $minor= "unknown";
1273                 }
1274
1275                 # Test to see if the row exists using INSERT IGNORE
1276                 # This avoids race conditions by locking the row until the commit, and also
1277                 # doesn't deadlock. SELECT FOR UPDATE causes a deadlock for every race condition.
1278                 $dbw->insert( 'image',
1279                         array(
1280                                 'img_name' => $this->name,
1281                                 'img_size'=> $this->size,
1282                                 'img_width' => IntVal( $this->width ),
1283                                 'img_height' => IntVal( $this->height ),
1284                                 'img_bits' => $this->bits,
1285                                 'img_media_type' => $this->type,
1286                                 'img_major_mime' => $major,
1287                                 'img_minor_mime' => $minor,
1288                                 'img_timestamp' => $now,
1289                                 'img_description' => $desc,
1290                                 'img_user' => $wgUser->getID(),
1291                                 'img_user_text' => $wgUser->getName(),
1292                                 'img_metadata' => $this->metadata,
1293                         ), $fname, 'IGNORE'
1294                 );
1295                 $descTitle = $this->getTitle();
1296                 $purgeURLs = array();
1297
1298                 if ( $dbw->affectedRows() ) {
1299                         # Successfully inserted, this is a new image
1300                         $id = $descTitle->getArticleID();
1301
1302                         if ( $id == 0 ) {
1303                                 $article = new Article( $descTitle );
1304                                 $article->insertNewArticle( $textdesc, $desc, false, false, true );
1305                         }
1306                 } else {
1307                         # Collision, this is an update of an image
1308                         # Insert previous contents into oldimage
1309                         $dbw->insertSelect( 'oldimage', 'image',
1310                                 array(
1311                                         'oi_name' => 'img_name',
1312                                         'oi_archive_name' => $dbw->addQuotes( $oldver ),
1313                                         'oi_size' => 'img_size',
1314                                         'oi_width' => 'img_width',
1315                                         'oi_height' => 'img_height',
1316                                         'oi_bits' => 'img_bits',
1317                                         'oi_timestamp' => 'img_timestamp',
1318                                         'oi_description' => 'img_description',
1319                                         'oi_user' => 'img_user',
1320                                         'oi_user_text' => 'img_user_text',
1321                                 ), array( 'img_name' => $this->name ), $fname
1322                         );
1323
1324                         # Update the current image row
1325                         $dbw->update( 'image',
1326                                 array( /* SET */
1327                                         'img_size' => $this->size,
1328                                         'img_width' => intval( $this->width ),
1329                                         'img_height' => intval( $this->height ),
1330                                         'img_bits' => $this->bits,
1331                                         'img_media_type' => $this->type,
1332                                         'img_major_mime' => $major,
1333                                         'img_minor_mime' => $minor,
1334                                         'img_timestamp' => $now,
1335                                         'img_description' => $desc,
1336                                         'img_user' => $wgUser->getID(),
1337                                         'img_user_text' => $wgUser->getName(),
1338                                         'img_metadata' => $this->metadata,
1339                                 ), array( /* WHERE */
1340                                         'img_name' => $this->name
1341                                 ), $fname
1342                         );
1343
1344                         # Invalidate the cache for the description page
1345                         $descTitle->invalidateCache();
1346                         $purgeURLs[] = $descTitle->getInternalURL();
1347                 }
1348
1349                 # Invalidate cache for all pages using this image
1350                 $linksTo = $this->getLinksTo();
1351
1352                 if ( $wgUseSquid ) {
1353                         $u = SquidUpdate::newFromTitles( $linksTo, $purgeURLs );
1354                         array_push( $wgPostCommitUpdateList, $u );
1355                 }
1356                 Title::touchArray( $linksTo );
1357
1358                 $log = new LogPage( 'upload' );
1359                 $log->addEntry( 'upload', $descTitle, $desc );
1360
1361                 return true;
1362         }
1363
1364         /**
1365          * Get an array of Title objects which are articles which use this image
1366          * Also adds their IDs to the link cache
1367          *
1368          * This is mostly copied from Title::getLinksTo()
1369          */
1370         function getLinksTo( $options = '' ) {
1371                 global $wgLinkCache;
1372                 $fname = 'Image::getLinksTo';
1373                 wfProfileIn( $fname );
1374
1375                 if ( $options ) {
1376                         $db =& wfGetDB( DB_MASTER );
1377                 } else {
1378                         $db =& wfGetDB( DB_SLAVE );
1379                 }
1380
1381                 extract( $db->tableNames( 'page', 'imagelinks' ) );
1382                 $encName = $db->addQuotes( $this->name );
1383                 $sql = "SELECT page_namespace,page_title,page_id FROM $page,$imagelinks WHERE page_id=il_from AND il_to=$encName $options";
1384                 $res = $db->query( $sql, $fname );
1385
1386                 $retVal = array();
1387                 if ( $db->numRows( $res ) ) {
1388                         while ( $row = $db->fetchObject( $res ) ) {
1389                                 if ( $titleObj = Title::makeTitle( $row->page_namespace, $row->page_title ) ) {
1390                                         $wgLinkCache->addGoodLinkObj( $row->page_id, $titleObj );
1391                                         $retVal[] = $titleObj;
1392                                 }
1393                         }
1394                 }
1395                 $db->freeResult( $res );
1396                 return $retVal;
1397         }
1398         /**
1399          * Retrive Exif data from the database
1400          *
1401          * Retrive Exif data from the database and prune unrecognized tags
1402          * and/or tags with invalid contents
1403          *
1404          * @return array
1405          */
1406         function retrieveExifData () {
1407                 if ( $this->getMimeType() !== "image/jpeg" ) return array ();
1408
1409                 wfSuppressWarnings();
1410                 $exif = exif_read_data( $this->imagePath );
1411                 wfRestoreWarnings();
1412
1413                 foreach($exif as $k => $v) {
1414                         if ( !in_array($k, array_keys($this->exif->mFlatExif)) ) {
1415                                 wfDebug( "Image::retrieveExifData: '$k' is not a valid Exif tag (type: '" . gettype($v) . "'; data: '$v')\n");
1416                                 unset($exif[$k]);
1417                         }
1418                 }
1419
1420                 foreach($exif as $k => $v) {
1421                         if ( !$this->exif->validate($k, $v) ) {
1422                                 wfDebug( "Image::retrieveExifData: '$k' contained invalid data (type: '" . gettype($v) . "'; data: '$v')\n");
1423                                 unset($exif[$k]);
1424                         }
1425                 }
1426                 return $exif;
1427         }
1428
1429         function getExifData () {
1430                 global $wgRequest;
1431                 if ( $this->metadata === '0' )
1432                         return array();
1433
1434                 $purge = $wgRequest->getVal( 'action' ) == 'purge';
1435                 $ret = unserialize ( $this->metadata );
1436
1437                 $oldver = isset( $ret['MEDIAWIKI_EXIF_VERSION'] ) ? $ret['MEDIAWIKI_EXIF_VERSION'] : 0;
1438                 $newver = $this->exif->version();
1439
1440                 if ( !count( $ret ) || $purge || $oldver != $newver ) {
1441                         $this->updateExifData( $newver );
1442                 }
1443                 if ( isset( $ret['MEDIAWIKI_EXIF_VERSION'] ) )
1444                         unset( $ret['MEDIAWIKI_EXIF_VERSION'] );
1445
1446                 foreach($ret as $k => $v) {
1447                         $ret[$k] = $this->exif->format($k, $v);
1448                 }
1449
1450                 return $ret;
1451         }
1452
1453         function updateExifData( $version ) {
1454                 $fname = 'Image:updateExifData';
1455
1456                 if ( $this->getImagePath() === false ) # Not a local image
1457                         return;
1458
1459                 # Get EXIF data from image
1460                 $exif = $this->retrieveExifData();
1461                 if ( count( $exif ) ) {
1462                         $exif['MEDIAWIKI_EXIF_VERSION'] = $version;
1463                         $this->metadata = serialize( $exif );
1464                 } else {
1465                         $this->metadata = '0';
1466                 }
1467
1468                 # Update EXIF data in database
1469                 $dbw =& wfGetDB( DB_MASTER );
1470
1471                 $this->checkDBSchema($dbw);
1472
1473                 $dbw->update( 'image',
1474                         array( 'img_metadata' => $this->metadata ),
1475                         array( 'img_name' => $this->name ),
1476                         $fname
1477                 );
1478         }
1479
1480 } //class
1481
1482
1483 /**
1484  * Returns the image directory of an image
1485  * If the directory does not exist, it is created.
1486  * The result is an absolute path.
1487  *
1488  * This function is called from thumb.php before Setup.php is included
1489  *
1490  * @param string $fname         file name of the image file
1491  * @access public
1492  */
1493 function wfImageDir( $fname ) {
1494         global $wgUploadDirectory, $wgHashedUploadDirectory;
1495
1496         if (!$wgHashedUploadDirectory) { return $wgUploadDirectory; }
1497
1498         $hash = md5( $fname );
1499         $oldumask = umask(0);
1500         $dest = $wgUploadDirectory . '/' . $hash{0};
1501         if ( ! is_dir( $dest ) ) { mkdir( $dest, 0777 ); }
1502         $dest .= '/' . substr( $hash, 0, 2 );
1503         if ( ! is_dir( $dest ) ) { mkdir( $dest, 0777 ); }
1504
1505         umask( $oldumask );
1506         return $dest;
1507 }
1508
1509 /**
1510  * Returns the image directory of an image's thubnail
1511  * If the directory does not exist, it is created.
1512  * The result is an absolute path.
1513  *
1514  * This function is called from thumb.php before Setup.php is included
1515  *
1516  * @param string $fname         file name of the original image file
1517  * @param string $subdir        (optional) subdirectory of the image upload directory that should be used for storing the thumbnail. Default is 'thumb'
1518  * @param boolean $shared       (optional) use the shared upload directory
1519  * @access public
1520  */
1521 function wfImageThumbDir( $fname, $shared = false ) {
1522         $base = wfImageArchiveDir( $fname, 'thumb', $shared );
1523         if ( Image::isHashed( $shared ) ) {
1524                 $dir =  "$base/$fname";
1525
1526                 if ( !is_dir( $base ) ) {
1527                         $oldumask = umask(0);
1528                         @mkdir( $base, 0777 );
1529                         umask( $oldumask );
1530                 }
1531
1532                 if ( ! is_dir( $dir ) ) {
1533                         $oldumask = umask(0);
1534                         @mkdir( $dir, 0777 );
1535                         umask( $oldumask );
1536                 }
1537         } else {
1538                 $dir = $base;
1539         }
1540
1541         return $dir;
1542 }
1543
1544 /**
1545  * Old thumbnail directory, kept for conversion
1546  */
1547 function wfDeprecatedThumbDir( $thumbName , $subdir='thumb', $shared=false) {
1548         return wfImageArchiveDir( $thumbName, $subdir, $shared );
1549 }
1550
1551 /**
1552  * Returns the image directory of an image's old version
1553  * If the directory does not exist, it is created.
1554  * The result is an absolute path.
1555  *
1556  * This function is called from thumb.php before Setup.php is included
1557  *
1558  * @param string $fname         file name of the thumbnail file, including file size prefix
1559  * @param string $subdir        (optional) subdirectory of the image upload directory that should be used for storing the old version. Default is 'archive'
1560  * @param boolean $shared       (optional) use the shared upload directory (only relevant for other functions which call this one)
1561  * @access public
1562  */
1563 function wfImageArchiveDir( $fname , $subdir='archive', $shared=false ) {
1564         global $wgUploadDirectory, $wgHashedUploadDirectory,
1565                $wgSharedUploadDirectory, $wgHashedSharedUploadDirectory;
1566         $dir = $shared ? $wgSharedUploadDirectory : $wgUploadDirectory;
1567         $hashdir = $shared ? $wgHashedSharedUploadDirectory : $wgHashedUploadDirectory;
1568         if (!$hashdir) { return $dir.'/'.$subdir; }
1569         $hash = md5( $fname );
1570         $oldumask = umask(0);
1571
1572         # Suppress warning messages here; if the file itself can't
1573         # be written we'll worry about it then.
1574         wfSuppressWarnings();
1575
1576         $archive = $dir.'/'.$subdir;
1577         if ( ! is_dir( $archive ) ) { mkdir( $archive, 0777 ); }
1578         $archive .= '/' . $hash{0};
1579         if ( ! is_dir( $archive ) ) { mkdir( $archive, 0777 ); }
1580         $archive .= '/' . substr( $hash, 0, 2 );
1581         if ( ! is_dir( $archive ) ) { mkdir( $archive, 0777 ); }
1582
1583         wfRestoreWarnings();
1584         umask( $oldumask );
1585         return $archive;
1586 }
1587
1588
1589 /*
1590  * Return the hash path component of an image path (URL or filesystem),
1591  * e.g. "/3/3c/", or just "/" if hashing is not used.
1592  *
1593  * @param $dbkey The filesystem / database name of the file
1594  * @param $fromSharedDirectory Use the shared file repository? It may
1595  *   use different hash settings from the local one.
1596  */
1597 function wfGetHashPath ( $dbkey, $fromSharedDirectory = false ) {
1598         global $wgHashedSharedUploadDirectory, $wgSharedUploadDirectory;
1599         global $wgHashedUploadDirectory;
1600
1601         if( Image::isHashed( $fromSharedDirectory ) ) {
1602                 $hash = md5($dbkey);
1603                 return '/' . $hash{0} . '/' . substr( $hash, 0, 2 ) . '/';
1604         } else {
1605                 return '/';
1606         }
1607 }
1608
1609 /**
1610  * Returns the image URL of an image's old version
1611  *
1612  * @param string $fname         file name of the image file
1613  * @param string $subdir        (optional) subdirectory of the image upload directory that is used by the old version. Default is 'archive'
1614  * @access public
1615  */
1616 function wfImageArchiveUrl( $name, $subdir='archive' ) {
1617         global $wgUploadPath, $wgHashedUploadDirectory;
1618
1619         if ($wgHashedUploadDirectory) {
1620                 $hash = md5( substr( $name, 15) );
1621                 $url = $wgUploadPath.'/'.$subdir.'/' . $hash{0} . '/' .
1622                   substr( $hash, 0, 2 ) . '/'.$name;
1623         } else {
1624                 $url = $wgUploadPath.'/'.$subdir.'/'.$name;
1625         }
1626         return wfUrlencode($url);
1627 }
1628
1629 /**
1630  * Return a rounded pixel equivalent for a labeled CSS/SVG length.
1631  * http://www.w3.org/TR/SVG11/coords.html#UnitIdentifiers
1632  *
1633  * @param string $length
1634  * @return int Length in pixels
1635  */
1636 function wfScaleSVGUnit( $length ) {
1637         static $unitLength = array(
1638                 'px' => 1.0,
1639                 'pt' => 1.25,
1640                 'pc' => 15.0,
1641                 'mm' => 3.543307,
1642                 'cm' => 35.43307,
1643                 'in' => 90.0,
1644                 ''   => 1.0, // "User units" pixels by default
1645                 '%'  => 2.0, // Fake it!
1646                 );
1647         if( preg_match( '/^(\d+)(em|ex|px|pt|pc|cm|mm|in|%|)$/', $length, $matches ) ) {
1648                 $length = FloatVal( $matches[1] );
1649                 $unit = $matches[2];
1650                 return round( $length * $unitLength[$unit] );
1651         } else {
1652                 // Assume pixels
1653                 return round( FloatVal( $length ) );
1654         }
1655 }
1656
1657 /**
1658  * Compatible with PHP getimagesize()
1659  * @todo support gzipped SVGZ
1660  * @todo check XML more carefully
1661  * @todo sensible defaults
1662  *
1663  * @param string $filename
1664  * @return array
1665  */
1666 function wfGetSVGsize( $filename ) {
1667         $width = 256;
1668         $height = 256;
1669
1670         // Read a chunk of the file
1671         $f = fopen( $filename, "rt" );
1672         if( !$f ) return false;
1673         $chunk = fread( $f, 4096 );
1674         fclose( $f );
1675
1676         // Uber-crappy hack! Run through a real XML parser.
1677         if( !preg_match( '/<svg\s*([^>]*)\s*>/s', $chunk, $matches ) ) {
1678                 return false;
1679         }
1680         $tag = $matches[1];
1681         if( preg_match( '/\bwidth\s*=\s*("[^"]+"|\'[^\']+\')/s', $tag, $matches ) ) {
1682                 $width = wfScaleSVGUnit( trim( substr( $matches[1], 1, -1 ) ) );
1683         }
1684         if( preg_match( '/\bheight\s*=\s*("[^"]+"|\'[^\']+\')/s', $tag, $matches ) ) {
1685                 $height = wfScaleSVGUnit( trim( substr( $matches[1], 1, -1 ) ) );
1686         }
1687
1688         return array( $width, $height, 'SVG',
1689                 "width=\"$width\" height=\"$height\"" );
1690 }
1691
1692 /**
1693  * Determine if an image exists on the 'bad image list'
1694  *
1695  * @param string $name The image to check
1696  * @return bool
1697  */
1698 function wfIsBadImage( $name ) {
1699         global $wgContLang;
1700         static $titleList = false;
1701         if ( $titleList === false ) {
1702                 $titleList = array();
1703
1704                 $lines = explode("\n", wfMsgForContent( 'bad_image_list' ));
1705                 foreach ( $lines as $line ) {
1706                         if ( preg_match( '/^\*\s*\[{2}:(' . $wgContLang->getNsText( NS_IMAGE ) . ':.*?)\]{2}/', $line, $m ) ) {
1707                                 $t = Title::newFromText( $m[1] );
1708                                 $titleList[$t->getDBkey()] = 1;
1709                         }
1710                 }
1711         }
1712
1713         return array_key_exists( $name, $titleList );
1714 }
1715
1716
1717
1718 /**
1719  * Wrapper class for thumbnail images
1720  * @package MediaWiki
1721  */
1722 class ThumbnailImage {
1723         /**
1724          * @param string $path Filesystem path to the thumb
1725          * @param string $url URL path to the thumb
1726          * @access private
1727          */
1728         function ThumbnailImage( $url, $width, $height, $path = false ) {
1729                 $this->url = $url;
1730                 $this->width = $width;
1731                 $this->height = $height;
1732                 $this->path = $path;
1733         }
1734
1735         /**
1736          * @return string The thumbnail URL
1737          */
1738         function getUrl() {
1739                 return $this->url;
1740         }
1741
1742         /**
1743          * Return HTML <img ... /> tag for the thumbnail, will include
1744          * width and height attributes and a blank alt text (as required).
1745          *
1746          * You can set or override additional attributes by passing an
1747          * associative array of name => data pairs. The data will be escaped
1748          * for HTML output, so should be in plaintext.
1749          *
1750          * @param array $attribs
1751          * @return string
1752          * @access public
1753          */
1754         function toHtml( $attribs = array() ) {
1755                 $attribs['src'] = $this->url;
1756                 $attribs['width'] = $this->width;
1757                 $attribs['height'] = $this->height;
1758                 if( !isset( $attribs['alt'] ) ) $attribs['alt'] = '';
1759
1760                 $html = '<img ';
1761                 foreach( $attribs as $name => $data ) {
1762                         $html .= $name . '="' . htmlspecialchars( $data ) . '" ';
1763                 }
1764                 $html .= '/>';
1765                 return $html;
1766         }
1767
1768 }
1769 ?>