includes/Image.php

   1 <?php
   2 /**
   3  * @package MediaWiki
   4  */
   5
   6 /**
   7  * Class to represent an image
   8  *
   9  * Provides methods to retrieve paths (physical, logical, URL),
  10  * to generate thumbnails or for uploading.
  11  * @package MediaWiki
  12  */
  13 class Image
  14 {
  15         /**#@+
  16          * @access private
  17          */
  18         var     $name,          # name of the image (constructor)
  19                 $imagePath,     # Path of the image (loadFromXxx)
  20                 $url,           # Image URL (accessor)
  21                 $title,         # Title object for this image (constructor)
  22                 $fileExists,    # does the image file exist on disk? (loadFromXxx)
  23                 $fromSharedDirectory, # load this image from $wgSharedUploadDirectory (loadFromXxx)
  24                 $historyLine,   # Number of line to return by nextHistoryLine() (constructor)
  25                 $historyRes,    # result of the query for the image's history (nextHistoryLine)
  26                 $width,         # \
  27                 $height,        #  |
  28                 $bits,          #   --- returned by getimagesize (loadFromXxx)
  29                 $type,          #  |
  30                 $attr,          # /
  31                 $size,          # Size in bytes (loadFromXxx)
  32                 $dataLoaded;    # Whether or not all this has been loaded from the database (loadFromXxx)
  33
  34
  35         /**#@-*/
  36
  37         /**
  38          * Create an Image object from an image name
  39          *
  40          * @param string $name name of the image, used to create a title object using Title::makeTitleSafe
  41          * @access public
  42          */
  43         function newFromName( $name ) {
  44                 $title = Title::makeTitleSafe( NS_IMAGE, $name );
  45                 return new Image( $title );
  46         }
  47
  48         /**
  49          * Obsolete factory function, use constructor
  50          */
  51         function newFromTitle( $title ) {
  52                 return new Image( $title );
  53         }
  54
  55         function Image( $title ) {
  56                 $this->title =& $title;
  57                 $this->name = $title->getDBkey();
  58
  59                 $n = strrpos( $this->name, '.' );
  60                 $this->extension = strtolower( $n ? substr( $this->name, $n + 1 ) : '' );
  61                 $this->historyLine = 0;
  62
  63                 $this->dataLoaded = false;
  64         }
  65
  66         /**
  67          * Get the memcached keys
  68          * Returns an array, first element is the local cache key, second is the shared cache key, if there is one
  69          */
  70         function getCacheKeys( $shared = false ) {
  71                 global $wgDBname, $wgUseSharedUploads, $wgSharedUploadDBname, $wgCacheSharedUploads;
  72
  73                 $foundCached = false;
  74                 $hashedName = md5($this->name);
  75                 $keys = array( "$wgDBname:Image:$hashedName" );
  76                 if ( $wgUseSharedUploads && $wgSharedUploadDBname && $wgCacheSharedUploads ) {
  77                         $keys[] = "$wgSharedUploadDBname:Image:$hashedName";
  78                 }
  79                 return $keys;
  80         }
  81
  82         /**
  83          * Try to load image metadata from memcached. Returns true on success.
  84          */
  85         function loadFromCache() {
  86                 global $wgUseSharedUploads, $wgMemc;
  87                 $fname = 'Image::loadFromMemcached';
  88                 wfProfileIn( $fname );
  89                 $this->dataLoaded = false;
  90                 $keys = $this->getCacheKeys();
  91                 $cachedValues = $wgMemc->get( $keys[0] );
  92
  93                 // Check if the key existed and belongs to this version of MediaWiki
  94                 if (!empty($cachedValues) && is_array($cachedValues) && isset($cachedValues['width']) && $cachedValues['fileExists']) {
  95                         if ( $wgUseSharedUploads && $cachedValues['fromShared']) {
  96                                 # if this is shared file, we need to check if image
  97                                 # in shared repository has not changed
  98                                 if ( isset( $keys[1] ) ) {
  99                                         $commonsCachedValues = $wgMemc->get( $keys[1] );
 100                                         if (!empty($commonsCachedValues) && is_array($commonsCachedValues) && isset($commonsCachedValues['width'])) {
 101                                                 $this->name = $commonsCachedValues['name'];
 102                                                 $this->imagePath = $commonsCachedValues['imagePath'];
 103                                                 $this->fileExists = $commonsCachedValues['fileExists'];
 104                                                 $this->width = $commonsCachedValues['width'];
 105                                                 $this->height = $commonsCachedValues['height'];
 106                                                 $this->bits = $commonsCachedValues['bits'];
 107                                                 $this->type = $commonsCachedValues['type'];
 108                                                 $this->size = $commonsCachedValues['size'];
 109                                                 $this->fromSharedDirectory = true;
 110                                                 $this->dataLoaded = true;
 111                                                 $this->imagePath = $this->getFullPath(true);
 112                                         }
 113                                 }
 114                         }
 115                         else {
 116                                 $this->name = $cachedValues['name'];
 117                                 $this->imagePath = $cachedValues['imagePath'];
 118                                 $this->fileExists = $cachedValues['fileExists'];
 119                                 $this->width = $cachedValues['width'];
 120                                 $this->height = $cachedValues['height'];
 121                                 $this->bits = $cachedValues['bits'];
 122                                 $this->type = $cachedValues['type'];
 123                                 $this->size = $cachedValues['size'];
 124                                 $this->fromSharedDirectory = false;
 125                                 $this->dataLoaded = true;
 126                                 $this->imagePath = $this->getFullPath();
 127                         }
 128                 }
 129
 130                 wfProfileOut( $fname );
 131                 return $this->dataLoaded;
 132         }
 133
 134         /**
 135          * Save the image metadata to memcached
 136          */
 137         function saveToCache() {
 138                 global $wgMemc;
 139                 $this->load();
 140                 // We can't cache metadata for non-existent files, because if the file later appears
 141                 // in commons, the local keys won't be purged.
 142                 if ( $this->fileExists ) {
 143                         $keys = $this->getCacheKeys();
 144
 145                         $cachedValues = array('name' => $this->name,
 146                                                                   'imagePath' => $this->imagePath,
 147                                                                   'fileExists' => $this->fileExists,
 148                                                                   'fromShared' => $this->fromSharedDirectory,
 149                                                                   'width' => $this->width,
 150                                                                   'height' => $this->height,
 151                                                                   'bits' => $this->bits,
 152                                                                   'type' => $this->type,
 153                                                                   'size' => $this->size);
 154
 155                         $wgMemc->set( $keys[0], $cachedValues );
 156                 }
 157         }
 158
 159         /**
 160          * Load metadata from the file itself
 161          */
 162         function loadFromFile() {
 163                 global $wgUseSharedUploads, $wgSharedUploadDirectory, $wgLang;
 164                 $fname = 'Image::loadFromFile';
 165                 wfProfileIn( $fname );
 166                 $this->imagePath = $this->getFullPath();
 167                 $this->fileExists = file_exists( $this->imagePath );
 168                 $this->fromSharedDirectory = false;
 169                 $gis = false;
 170
 171                 # If the file is not found, and a shared upload directory is used, look for it there.
 172                 if (!$this->fileExists && $wgUseSharedUploads && $wgSharedUploadDirectory) {
 173                         # In case we're on a wgCapitalLinks=false wiki, we
 174                         # capitalize the first letter of the filename before
 175                         # looking it up in the shared repository.
 176                         $sharedImage = Image::newFromName( $wgLang->ucfirst($this->name) );
 177                         $this->fileExists = file_exists( $sharedImage->getFullPath(true) );
 178                         if ( $this->fileExists ) {
 179                                 $this->name = $sharedImage->name;
 180                                 $this->imagePath = $this->getFullPath(true);
 181                                 $this->fromSharedDirectory = true;
 182                         }
 183                 }
 184
 185                 if ( $this->fileExists ) {
 186                         # Get size in bytes
 187                         $s = stat( $this->imagePath );
 188                         $this->size = $s['size'];
 189
 190                         # Height and width
 191                         # Don't try to get the width and height of sound and video files, that's bad for performance
 192                         if ( !Image::isKnownImageExtension( $this->extension ) ) {
 193                                 $gis = false;
 194                         } elseif( $this->extension == 'svg' ) {
 195                                 wfSuppressWarnings();
 196                                 $gis = wfGetSVGsize( $this->imagePath );
 197                                 wfRestoreWarnings();
 198                         } else {
 199                                 wfSuppressWarnings();
 200                                 $gis = getimagesize( $this->imagePath );
 201                                 wfRestoreWarnings();
 202                         }
 203                 }
 204                 if( $gis === false ) {
 205                         $this->width = 0;
 206                         $this->height = 0;
 207                         $this->bits = 0;
 208                         $this->type = 0;
 209                 } else {
 210                         $this->width = $gis[0];
 211                         $this->height = $gis[1];
 212                         $this->type = $gis[2];
 213                         if ( isset( $gis['bits'] ) )  {
 214                                 $this->bits = $gis['bits'];
 215                         } else {
 216                                 $this->bits = 0;
 217                         }
 218                 }
 219                 $this->dataLoaded = true;
 220                 wfProfileOut( $fname );
 221         }
 222
 223         /**
 224          * Load image metadata from the DB
 225          */
 226         function loadFromDB() {
 227                 global $wgUseSharedUploads, $wgSharedUploadDBname, $wgLang;
 228                 $fname = 'Image::loadFromDB';
 229                 wfProfileIn( $fname );
 230
 231                 $dbr =& wfGetDB( DB_SLAVE );
 232                 $row = $dbr->selectRow( 'image',
 233                         array( 'img_size', 'img_width', 'img_height', 'img_bits', 'img_type' ),
 234                         array( 'img_name' => $this->name ), $fname );
 235                 if ( $row ) {
 236                         $this->fromSharedDirectory = false;
 237                         $this->fileExists = true;
 238                         $this->loadFromRow( $row );
 239                         $this->imagePath = $this->getFullPath();
 240                         // Check for rows from a previous schema, quietly upgrade them
 241                         if ( $this->type == -1 ) {
 242                                 $this->upgradeRow();
 243                         }
 244                 } elseif ( $wgUseSharedUploads && $wgSharedUploadDBname ) {
 245                         # In case we're on a wgCapitalLinks=false wiki, we
 246                         # capitalize the first letter of the filename before
 247                         # looking it up in the shared repository.
 248                         $name = $wgLang->ucfirst($this->name);
 249
 250                         $row = $dbr->selectRow( "`$wgSharedUploadDBname`.image",
 251                                 array( 'img_size', 'img_width', 'img_height', 'img_bits', 'img_type' ),
 252                                 array( 'img_name' => $name ), $fname );
 253                         if ( $row ) {
 254                                 $this->fromSharedDirectory = true;
 255                                 $this->fileExists = true;
 256                                 $this->imagePath = $this->getFullPath(true);
 257                                 $this->name = $name;
 258                                 $this->loadFromRow( $row );
 259
 260                                 // Check for rows from a previous schema, quietly upgrade them
 261                                 if ( $this->type == -1 ) {
 262                                         $this->upgradeRow();
 263                                 }
 264                         }
 265                 }
 266
 267                 if ( !$row ) {
 268                         $this->size = 0;
 269                         $this->width = 0;
 270                         $this->height = 0;
 271                         $this->bits = 0;
 272                         $this->type = 0;
 273                         $this->fileExists = false;
 274                         $this->fromSharedDirectory = false;
 275                 }
 276
 277                 # Unconditionally set loaded=true, we don't want the accessors constantly rechecking
 278                 $this->dataLoaded = true;
 279         }
 280
 281         /*
 282          * Load image metadata from a DB result row
 283          */
 284         function loadFromRow( &$row ) {
 285                 $this->size = $row->img_size;
 286                 $this->width = $row->img_width;
 287                 $this->height = $row->img_height;
 288                 $this->bits = $row->img_bits;
 289                 $this->type = $row->img_type;
 290                 $this->dataLoaded = true;
 291         }
 292
 293         /**
 294          * Load image metadata from cache or DB, unless already loaded
 295          */
 296         function load() {
 297                 global $wgSharedUploadDBname, $wgUseSharedUploads;
 298                 if ( !$this->dataLoaded ) {
 299                         if ( !$this->loadFromCache() ) {
 300                                 $this->loadFromDB();
 301                                 if ( !$wgSharedUploadDBname && $wgUseSharedUploads ) {
 302                                         $this->loadFromFile();
 303                                 } elseif ( $this->fileExists ) {
 304                                         $this->saveToCache();
 305                                 }
 306                         }
 307                         $this->dataLoaded = true;
 308                 }
 309         }
 310
 311         /**
 312          * Metadata was loaded from the database, but the row had a marker indicating it needs to be
 313          * upgraded from the 1.4 schema, which had no width, height, bits or type. Upgrade the row.
 314          */
 315         function upgradeRow() {
 316                 global $wgDBname, $wgSharedUploadDBname;
 317                 $fname = 'Image::upgradeRow';
 318                 $this->loadFromFile();
 319                 $dbw =& wfGetDB( DB_MASTER );
 320
 321                 if ( $this->fromSharedDirectory ) {
 322                         if ( !$wgSharedUploadDBname ) {
 323                                 return;
 324                         }
 325
 326                         // Write to the other DB using selectDB, not database selectors
 327                         // This avoids breaking replication in MySQL
 328                         $dbw->selectDB( $wgSharedUploadDBname );
 329                 }
 330                 $dbw->update( '`image`',
 331                         array(
 332                                 'img_width' => $this->width,
 333                                 'img_height' => $this->height,
 334                                 'img_bits' => $this->bits,
 335                                 'img_type' => $this->type,
 336                         ), array( 'img_name' => $this->name ), $fname
 337                 );
 338                 if ( $this->fromSharedDirectory ) {
 339                         $dbw->selectDB( $wgDBname );
 340                 }
 341         }
 342
 343         /**
 344          * Return the name of this image
 345          * @access public
 346          */
 347         function getName() {
 348                 return $this->name;
 349         }
 350
 351         /**
 352          * Return the associated title object
 353          * @access public
 354          */
 355         function getTitle() {
 356                 return $this->title;
 357         }
 358
 359         /**
 360          * Return the URL of the image file
 361          * @access public
 362          */
 363         function getURL() {
 364                 if ( !$this->url ) {
 365                         $this->load();
 366                         if($this->fileExists) {
 367                                 $this->url = Image::imageUrl( $this->name, $this->fromSharedDirectory );
 368                         } else {
 369                                 $this->url = '';
 370                         }
 371                 }
 372                 return $this->url;
 373         }
 374
 375         function getViewURL() {
 376                 if( $this->mustRender() ) {
 377                         return $this->createThumb( $this->getWidth() );
 378                 } else {
 379                         return $this->getURL();
 380                 }
 381         }
 382
 383         /**
 384          * Return the image path of the image in the
 385          * local file system as an absolute path
 386          * @access public
 387          */
 388         function getImagePath() {
 389                 $this->load();
 390                 return $this->imagePath;
 391         }
 392
 393         /**
 394          * Return the width of the image
 395          *
 396          * Returns -1 if the file specified is not a known image type
 397          * @access public
 398          */
 399         function getWidth() {
 400                 $this->load();
 401                 return $this->width;
 402         }
 403
 404         /**
 405          * Return the height of the image
 406          *
 407          * Returns -1 if the file specified is not a known image type
 408          * @access public
 409          */
 410         function getHeight() {
 411                 $this->load();
 412                 return $this->height;
 413         }
 414
 415         /**
 416          * Return the size of the image file, in bytes
 417          * @access public
 418          */
 419         function getSize() {
 420                 $this->load();
 421                 return $this->size;
 422         }
 423
 424         /**
 425          * Return the type of the image
 426          *
 427          * -  1 GIF
 428          * -  2 JPG
 429          * -  3 PNG
 430          * - 15 WBMP
 431          * - 16 XBM
 432          */
 433         function getType() {
 434                 $this->load();
 435                 return $this->type;
 436         }
 437
 438         /**
 439          * Return the escapeLocalURL of this image
 440          * @access public
 441          */
 442         function getEscapeLocalURL() {
 443                 $this->getTitle();
 444                 return $this->title->escapeLocalURL();
 445         }
 446
 447         /**
 448          * Return the escapeFullURL of this image
 449          * @access public
 450          */
 451         function getEscapeFullURL() {
 452                 $this->getTitle();
 453                 return $this->title->escapeFullURL();
 454         }
 455
 456         /**
 457          * Return the URL of an image, provided its name.
 458          *
 459          * @param string $name  Name of the image, without the leading "Image:"
 460          * @param boolean $fromSharedDirectory  Should this be in $wgSharedUploadPath?
 461          * @access public
 462          * @static
 463          */
 464         function imageUrl( $name, $fromSharedDirectory = false ) {
 465                 global $wgUploadPath,$wgUploadBaseUrl,$wgSharedUploadPath;
 466                 if($fromSharedDirectory) {
 467                         $base = '';
 468                         $path = $wgSharedUploadPath;
 469                 } else {
 470                         $base = $wgUploadBaseUrl;
 471                         $path = $wgUploadPath;
 472                 }
 473                 $url = "{$base}{$path}" .  wfGetHashPath($name, $fromSharedDirectory) . "{$name}";
 474                 return wfUrlencode( $url );
 475         }
 476
 477         /**
 478          * Returns true if the image file exists on disk.
 479          *
 480          * @access public
 481          */
 482         function exists() {
 483                 $this->load();
 484                 return $this->fileExists;
 485         }
 486
 487         /**
 488          *
 489          * @access private
 490          */
 491         function thumbUrl( $width, $subdir='thumb') {
 492                 global $wgUploadPath, $wgUploadBaseUrl,
 493                        $wgSharedUploadPath,$wgSharedUploadDirectory,
 494                            $wgSharedThumbnailScriptPath, $wgThumbnailScriptPath;
 495
 496                 // Generate thumb.php URL if possible
 497                 $script = false;
 498                 $url = false;
 499
 500                 if ( $this->fromSharedDirectory ) {
 501                         if ( $wgSharedThumbnailScriptPath ) {
 502                                 $script = $wgSharedThumbnailScriptPath;
 503                         }
 504                 } else {
 505                         if ( $wgThumbnailScriptPath ) {
 506                                 $script = $wgThumbnailScriptPath;
 507                         }
 508                 }
 509                 if ( $script ) {
 510                         $url = $script . '?f=' . urlencode( $this->name ) . '&w=' . urlencode( $width );
 511                 } else {
 512                         $name = $this->thumbName( $width );
 513                         if($this->fromSharedDirectory) {
 514                                 $base = '';
 515                                 $path = $wgSharedUploadPath;
 516                         } else {
 517                                 $base = $wgUploadBaseUrl;
 518                                 $path = $wgUploadPath;
 519                         }
 520                         $url = "{$base}{$path}/{$subdir}" .
 521                         wfGetHashPath($this->name, $this->fromSharedDirectory)
 522                         . $this->name.'/'.$name;
 523                         $url = wfUrlencode( $url );
 524                 }
 525                 return array( $script !== false, $url );
 526         }
 527
 528         /**
 529          * Return the file name of a thumbnail of the specified width
 530          *
 531          * @param integer $width        Width of the thumbnail image
 532          * @param boolean $shared       Does the thumbnail come from the shared repository?
 533          * @access private
 534          */
 535         function thumbName( $width ) {
 536                 $thumb = $width."px-".$this->name;
 537                 if( $this->extension == 'svg' ) {
 538                         # Rasterize SVG vector images to PNG
 539                         $thumb .= '.png';
 540                 }
 541                 return $thumb;
 542         }
 543
 544         /**
 545          * Create a thumbnail of the image having the specified width/height.
 546          * The thumbnail will not be created if the width is larger than the
 547          * image's width. Let the browser do the scaling in this case.
 548          * The thumbnail is stored on disk and is only computed if the thumbnail
 549          * file does not exist OR if it is older than the image.
 550          * Returns the URL.
 551          *
 552          * Keeps aspect ratio of original image. If both width and height are
 553          * specified, the generated image will be no bigger than width x height,
 554          * and will also have correct aspect ratio.
 555          *
 556          * @param integer $width        maximum width of the generated thumbnail
 557          * @param integer $height       maximum height of the image (optional)
 558          * @access public
 559          */
 560         function createThumb( $width, $height=-1 ) {
 561                 $thumb = $this->getThumbnail( $width, $height );
 562                 if( is_null( $thumb ) ) return '';
 563                 return $thumb->getUrl();
 564         }
 565
 566         /**
 567          * As createThumb, but returns a ThumbnailImage object. This can
 568          * provide access to the actual file, the real size of the thumb,
 569          * and can produce a convenient <img> tag for you.
 570          *
 571          * @param integer $width        maximum width of the generated thumbnail
 572          * @param integer $height       maximum height of the image (optional)
 573          * @return ThumbnailImage
 574          * @access public
 575          */
 576         function &getThumbnail( $width, $height=-1 ) {
 577                 if ( $height == -1 ) {
 578                         return $this->renderThumb( $width );
 579                 }
 580                 $this->load();
 581                 if ( $width < $this->width ) {
 582                         $thumbheight = $this->height * $width / $this->width;
 583                         $thumbwidth = $width;
 584                 } else {
 585                         $thumbheight = $this->height;
 586                         $thumbwidth = $this->width;
 587                 }
 588                 if ( $thumbheight > $height ) {
 589                         $thumbwidth = $thumbwidth * $height / $thumbheight;
 590                         $thumbheight = $height;
 591                 }
 592                 $thumb = $this->renderThumb( $thumbwidth );
 593                 if( is_null( $thumb ) ) {
 594                         $thumb = $this->iconThumb();
 595                 }
 596                 return $thumb;
 597         }
 598
 599         /**
 600          * @return ThumbnailImage
 601          */
 602         function iconThumb() {
 603                 global $wgStylePath, $wgStyleDirectory;
 604
 605                 $try = array( 'fileicon-' . $this->extension . '.png', 'fileicon.png' );
 606                 foreach( $try as $icon ) {
 607                         $path = '/common/images/' . $icon;
 608                         $filepath = $wgStyleDirectory . $path;
 609                         if( file_exists( $filepath ) ) {
 610                                 return new ThumbnailImage( $wgStylePath . $path, 120, 120 );
 611                         }
 612                 }
 613                 return null;
 614         }
 615
 616         /**
 617          * Create a thumbnail of the image having the specified width.
 618          * The thumbnail will not be created if the width is larger than the
 619          * image's width. Let the browser do the scaling in this case.
 620          * The thumbnail is stored on disk and is only computed if the thumbnail
 621          * file does not exist OR if it is older than the image.
 622          * Returns an object which can return the pathname, URL, and physical
 623          * pixel size of the thumbnail -- or null on failure.
 624          *
 625          * @return ThumbnailImage
 626          * @access private
 627          */
 628         function /* private */ renderThumb( $width, $useScript = true ) {
 629                 global $wgUseSquid, $wgInternalServer;
 630                 global $wgThumbnailScriptPath, $wgSharedThumbnailScriptPath;
 631
 632                 $width = IntVal( $width );
 633
 634                 $this->load();
 635                 if ( ! $this->exists() )
 636                 {
 637                         # If there is no image, there will be no thumbnail
 638                         return null;
 639                 }
 640
 641                 # Sanity check $width
 642                 if( $width <= 0 ) {
 643                         # BZZZT
 644                         return null;
 645                 }
 646
 647                 if( $width > $this->width && !$this->mustRender() ) {
 648                         # Don't make an image bigger than the source
 649                         return new ThumbnailImage( $this->getViewURL(), $this->getWidth(), $this->getHeight() );
 650                 }
 651
 652                 $height = floor( $this->height * ( $width/$this->width ) );
 653
 654                 list( $isScriptUrl, $url ) = $this->thumbUrl( $width );
 655                 if ( $isScriptUrl && $useScript ) {
 656                         // Use thumb.php to render the image
 657                         return new ThumbnailImage( $url, $width, $height );
 658                 }
 659
 660                 $thumbName = $this->thumbName( $width, $this->fromSharedDirectory );
 661                 $thumbPath = wfImageThumbDir( $this->name, $this->fromSharedDirectory ).'/'.$thumbName;
 662
 663                 if ( !file_exists( $thumbPath ) ) {
 664                         $oldThumbPath = wfDeprecatedThumbDir( $thumbName, 'thumb', $this->fromSharedDirectory ).
 665                                 '/'.$thumbName;
 666                         $done = false;
 667                         if ( file_exists( $oldThumbPath ) ) {
 668                                 if ( filemtime($oldThumbPath) >= filemtime($this->imagePath) ) {
 669                                         rename( $oldThumbPath, $thumbPath );
 670                                         $done = true;
 671                                 } else {
 672                                         unlink( $oldThumbPath );
 673                                 }
 674                         }
 675                         if ( !$done ) {
 676                                 $this->reallyRenderThumb( $thumbPath, $width, $height );
 677
 678                                 # Purge squid
 679                                 # This has to be done after the image is updated and present for all machines on NFS,
 680                                 # or else the old version might be stored into the squid again
 681                                 if ( $wgUseSquid ) {
 682                                         if ( substr( $url, 0, 4 ) == 'http' ) {
 683                                                 $urlArr = array( $url );
 684                                         } else {
 685                                                 $urlArr = array( $wgInternalServer.$url );
 686                                         }
 687                                         wfPurgeSquidServers($urlArr);
 688                                 }
 689                         }
 690                 }
 691                 return new ThumbnailImage( $url, $width, $height, $thumbPath );
 692         } // END OF function renderThumb
 693
 694         /**
 695          * Really render a thumbnail
 696          *
 697          * @access private
 698          */
 699         function /*private*/ reallyRenderThumb( $thumbPath, $width, $height ) {
 700                 global $wgSVGConverters, $wgSVGConverter,
 701                         $wgUseImageMagick, $wgImageMagickConvertCommand;
 702
 703                 $this->load();
 704
 705                 if( $this->extension == 'svg' ) {
 706                         global $wgSVGConverters, $wgSVGConverter;
 707                         if( isset( $wgSVGConverters[$wgSVGConverter] ) ) {
 708                                 global $wgSVGConverterPath;
 709                                 $cmd = str_replace(
 710                                         array( '$path/', '$width', '$input', '$output' ),
 711                                         array( $wgSVGConverterPath,
 712                                                    $width,
 713                                                    escapeshellarg( $this->imagePath ),
 714                                                    escapeshellarg( $thumbPath ) ),
 715                                         $wgSVGConverters[$wgSVGConverter] );
 716                                 $conv = shell_exec( $cmd );
 717                         } else {
 718                                 $conv = false;
 719                         }
 720                 } elseif ( $wgUseImageMagick ) {
 721                         # use ImageMagick
 722                         # Specify white background color, will be used for transparent images
 723                         # in Internet Explorer/Windows instead of default black.
 724                         $cmd  =  $wgImageMagickConvertCommand .
 725                                 " -quality 85 -background white -geometry {$width} ".
 726                                 escapeshellarg($this->imagePath) . " " .
 727                                 escapeshellarg($thumbPath);
 728                         $conv = shell_exec( $cmd );
 729                 } else {
 730                         # Use PHP's builtin GD library functions.
 731                         #
 732                         # First find out what kind of file this is, and select the correct
 733                         # input routine for this.
 734
 735                         $truecolor = false;
 736
 737                         switch( $this->type ) {
 738                                 case 1: # GIF
 739                                         $src_image = imagecreatefromgif( $this->imagePath );
 740                                         break;
 741                                 case 2: # JPG
 742                                         $src_image = imagecreatefromjpeg( $this->imagePath );
 743                                         $truecolor = true;
 744                                         break;
 745                                 case 3: # PNG
 746                                         $src_image = imagecreatefrompng( $this->imagePath );
 747                                         $truecolor = ( $this->bits > 8 );
 748                                         break;
 749                                 case 15: # WBMP for WML
 750                                         $src_image = imagecreatefromwbmp( $this->imagePath );
 751                                         break;
 752                                 case 16: # XBM
 753                                         $src_image = imagecreatefromxbm( $this->imagePath );
 754                                         break;
 755                                 default:
 756                                         return 'Image type not supported';
 757                                         break;
 758                         }
 759                         if ( $truecolor ) {
 760                                 $dst_image = imagecreatetruecolor( $width, $height );
 761                         } else {
 762                                 $dst_image = imagecreate( $width, $height );
 763                         }
 764                         imagecopyresampled( $dst_image, $src_image,
 765                                                 0,0,0,0,
 766                                                 $width, $height, $this->width, $this->height );
 767                         switch( $this->type ) {
 768                                 case 1:  # GIF
 769                                 case 3:  # PNG
 770                                 case 15: # WBMP
 771                                 case 16: # XBM
 772                                         imagepng( $dst_image, $thumbPath );
 773                                         break;
 774                                 case 2:  # JPEG
 775                                         imageinterlace( $dst_image );
 776                                         imagejpeg( $dst_image, $thumbPath, 95 );
 777                                         break;
 778                                 default:
 779                                         break;
 780                         }
 781                         imagedestroy( $dst_image );
 782                         imagedestroy( $src_image );
 783                 }
 784                 #
 785                 # Check for zero-sized thumbnails. Those can be generated when
 786                 # no disk space is available or some other error occurs
 787                 #
 788                 if( file_exists( $thumbPath ) ) {
 789                         $thumbstat = stat( $thumbPath );
 790                         if( $thumbstat['size'] == 0 ) {
 791                                 unlink( $thumbPath );
 792                         }
 793                 }
 794         }
 795
 796         /**
 797          * Get all thumbnail names previously generated for this image
 798          */
 799         function getThumbnails( $shared = false ) {
 800                 $this->load();
 801                 $files = array();
 802                 $dir = wfImageThumbDir( $this->name, $shared );
 803
 804                 // This generates an error on failure, hence the @
 805                 $handle = @opendir( $dir );
 806
 807                 if ( $handle ) {
 808                         while ( false !== ( $file = readdir($handle) ) ) {
 809                                 if ( $file{0} != '.' ) {
 810                                         $files[] = $file;
 811                                 }
 812                         }
 813                         closedir( $handle );
 814                 }
 815
 816                 return $files;
 817         }
 818
 819         /**
 820          * Delete all previously generated thumbnails, refresh metadata in memcached and purge the squid
 821          */
 822         function purgeCache( $archiveFiles = array(), $shared = false ) {
 823                 global $wgInternalServer, $wgUseSquid;
 824
 825                 // Refresh metadata cache
 826                 $this->loadFromFile();
 827                 $this->saveToCache();
 828
 829                 // Delete thumbnails
 830                 $files = $this->getThumbnails( $shared );
 831                 $dir = wfImageThumbDir( $this->name, $shared );
 832                 $urls = array();
 833                 foreach ( $files as $file ) {
 834                         if ( preg_match( '/^(\d+)px/', $file, $m ) ) {
 835                                 $urls[] = $wgInternalServer . $this->thumbUrl( $m[1], $this->fromSharedDirectory );
 836                                 @unlink( "$dir/$file" );
 837                         }
 838                 }
 839
 840                 // Purge the squid
 841                 if ( $wgUseSquid ) {
 842                         $urls[] = $wgInternalServer . $this->getViewURL();
 843                         foreach ( $archiveFiles as $file ) {
 844                                 $urls[] = $wgInternalServer . wfImageArchiveUrl( $file );
 845                         }
 846                         wfPurgeSquidServers( $urls );
 847                 }
 848         }
 849
 850         /**
 851          * Return the image history of this image, line by line.
 852          * starts with current version, then old versions.
 853          * uses $this->historyLine to check which line to return:
 854          *  0      return line for current version
 855          *  1      query for old versions, return first one
 856          *  2, ... return next old version from above query
 857          *
 858          * @access public
 859          */
 860         function nextHistoryLine() {
 861                 $fname = 'Image::nextHistoryLine()';
 862                 $dbr =& wfGetDB( DB_SLAVE );
 863                 if ( $this->historyLine == 0 ) {// called for the first time, return line from cur
 864                         $this->historyRes = $dbr->select( 'image',
 865                                 array( 'img_size','img_description','img_user','img_user_text','img_timestamp', "'' AS oi_archive_name" ),
 866                                 array( 'img_name' => $this->title->getDBkey() ),
 867                                 $fname
 868                         );
 869                         if ( 0 == wfNumRows( $this->historyRes ) ) {
 870                                 return FALSE;
 871                         }
 872                 } else if ( $this->historyLine == 1 ) {
 873                         $this->historyRes = $dbr->select( 'oldimage',
 874                                 array( 'oi_size AS img_size', 'oi_description AS img_description', 'oi_user AS img_user',
 875                                         'oi_user_text AS img_user_text', 'oi_timestamp AS img_timestamp', 'oi_archive_name'
 876                                 ), array( 'oi_name' => $this->title->getDBkey() ), $fname, array( 'ORDER BY' => 'oi_timestamp DESC' )
 877                         );
 878                 }
 879                 $this->historyLine ++;
 880
 881                 return $dbr->fetchObject( $this->historyRes );
 882         }
 883
 884         /**
 885          * Reset the history pointer to the first element of the history
 886          * @access public
 887          */
 888         function resetHistory() {
 889                 $this->historyLine = 0;
 890         }
 891
 892         /**
 893          * Return true if the file is of a type that can't be directly
 894          * rendered by typical browsers and needs to be re-rasterized.
 895          * @return bool
 896          */
 897         function mustRender() {
 898                 $this->load();
 899                 return ( $this->extension == 'svg' );
 900         }
 901
 902         /**
 903         * Return the full filesystem path to the file. Note that this does
 904         * not mean that a file actually exists under that location.
 905         *
 906         * This path depends on whether directory hashing is active or not,
 907         * i.e. whether the images are all found in the same directory,
 908         * or in hashed paths like /images/3/3c.
 909         *
 910         * @access public
 911         * @param boolean $fromSharedDirectory Return the path to the file
 912         *   in a shared repository (see $wgUseSharedRepository and related
 913         *   options in DefaultSettings.php) instead of a local one.
 914         *
 915         */
 916         function getFullPath( $fromSharedRepository = false ) {
 917                 global $wgUploadDirectory, $wgSharedUploadDirectory;
 918                 global $wgHashedUploadDirectory, $wgHashedSharedUploadDirectory;
 919
 920                 $dir      = $fromSharedRepository ? $wgSharedUploadDirectory :
 921                                                     $wgUploadDirectory;
 922
 923                 // $wgSharedUploadDirectory may be false, if thumb.php is used
 924                 if ( $dir ) {
 925                         $fullpath = $dir . wfGetHashPath($this->name, $fromSharedRepository) . $this->name;
 926                 } else {
 927                         $fullpath = false;
 928                 }
 929
 930                 return $fullpath;
 931         }
 932
 933         /**
 934          * @return bool
 935          * @static
 936          */
 937         function isKnownImageExtension( $ext ) {
 938                 static $extensions = array( 'svg', 'png', 'jpg', 'jpeg', 'gif', 'bmp', 'xbm' );
 939                 return in_array( $ext, $extensions );
 940         }
 941
 942         /**
 943          * Record an image upload in the upload log and the image table
 944          */
 945         function recordUpload( $oldver, $desc, $copyStatus = '', $source = '' ) {
 946                 global $wgUser, $wgLang, $wgTitle, $wgOut, $wgDeferredUpdateList;
 947                 global $wgUseCopyrightUpload;
 948
 949                 $fname = 'Image::recordUpload';
 950                 $dbw =& wfGetDB( DB_MASTER );
 951
 952                 # img_name must be unique
 953                 if ( !$dbw->indexUnique( 'image', 'img_name' ) && !$dbw->indexExists('image','PRIMARY') ) {
 954                         wfDebugDieBacktrace( 'Database schema not up to date, please run maintenance/archives/patch-image_name_unique.sql' );
 955                 }
 956
 957                 // Delete thumbnails and refresh the cache
 958                 $this->purgeCache();
 959
 960                 // Fail now if the image isn't there
 961                 if ( !$this->fileExists || $this->fromSharedDirectory ) {
 962                         return false;
 963                 }
 964
 965                 if ( $wgUseCopyrightUpload ) {
 966                         $textdesc = '== ' . wfMsg ( 'filedesc' ) . " ==\n" . $desc . "\n" .
 967                           '== ' . wfMsg ( 'filestatus' ) . " ==\n" . $copyStatus . "\n" .
 968                           '== ' . wfMsg ( 'filesource' ) . " ==\n" . $source ;
 969                 } else {
 970                         $textdesc = $desc;
 971                 }
 972
 973                 $now = wfTimestampNow();
 974
 975                 # Test to see if the row exists using INSERT IGNORE
 976                 # This avoids race conditions by locking the row until the commit, and also
 977                 # doesn't deadlock. SELECT FOR UPDATE causes a deadlock for every race condition.
 978                 $dbw->insert( 'image',
 979                         array(
 980                                 'img_name' => $this->name,
 981                                 'img_size'=> $this->size,
 982                                 'img_width' => $this->width,
 983                                 'img_height' => $this->height,
 984                                 'img_bits' => $this->bits,
 985                                 'img_type' => $this->type,
 986                                 'img_timestamp' => $dbw->timestamp($now),
 987                                 'img_description' => $desc,
 988                                 'img_user' => $wgUser->getID(),
 989                                 'img_user_text' => $wgUser->getName(),
 990                         ), $fname, 'IGNORE'
 991                 );
 992                 $descTitle = $this->getTitle();
 993
 994                 if ( $dbw->affectedRows() ) {
 995                         # Successfully inserted, this is a new image
 996                         $id = $descTitle->getArticleID();
 997
 998                         if ( $id == 0 ) {
 999                                 $article = new Article( $descTitle );
1000                                 $article->insertNewArticle( $textdesc, $desc, false, false, true );
1001                         }
1002                 } else {
1003                         # Collision, this is an update of an image
1004                         # Insert previous contents into oldimage
1005                         $dbw->insertSelect( 'oldimage', 'image',
1006                                 array(
1007                                         'oi_name' => 'img_name',
1008                                         'oi_archive_name' => $dbw->addQuotes( $oldver ),
1009                                         'oi_size' => 'img_size',
1010                                         'oi_width' => 'img_width',
1011                                         'oi_height' => 'img_height',
1012                                         'oi_bits' => 'img_bits',
1013                                         'oi_type' => 'img_type',
1014                                         'oi_timestamp' => 'img_timestamp',
1015                                         'oi_description' => 'img_description',
1016                                         'oi_user' => 'img_user',
1017                                         'oi_user_text' => 'img_user_text',
1018                                 ), array( 'img_name' => $this->name ), $fname
1019                         );
1020
1021                         # Update the current image row
1022                         $dbw->update( 'image',
1023                                 array( /* SET */
1024                                         'img_size' => $this->size,
1025                                         'img_width' => $this->width,
1026                                         'img_height' => $this->height,
1027                                         'img_bits' => $this->bits,
1028                                         'img_type' => $this->type,
1029                                         'img_timestamp' => $dbw->timestamp(),
1030                                         'img_user' => $wgUser->getID(),
1031                                         'img_user_text' => $wgUser->getName(),
1032                                         'img_description' => $desc,
1033                                 ), array( /* WHERE */
1034                                         'img_name' => $this->name
1035                                 ), $fname
1036                         );
1037
1038                         # Invalidate the cache for the description page
1039                         $descTitle->invalidateCache();
1040                 }
1041
1042                 $log = new LogPage( 'upload' );
1043                 $log->addEntry( 'upload', $descTitle, $desc );
1044
1045                 return true;
1046         }
1047
1048 } //class
1049
1050
1051 /**
1052  * Returns the image directory of an image
1053  * If the directory does not exist, it is created.
1054  * The result is an absolute path.
1055  *
1056  * This function is called from thumb.php before Setup.php is included
1057  *
1058  * @param string $fname         file name of the image file
1059  * @access public
1060  */
1061 function wfImageDir( $fname ) {
1062         global $wgUploadDirectory, $wgHashedUploadDirectory;
1063
1064         if (!$wgHashedUploadDirectory) { return $wgUploadDirectory; }
1065
1066         $hash = md5( $fname );
1067         $oldumask = umask(0);
1068         $dest = $wgUploadDirectory . '/' . $hash{0};
1069         if ( ! is_dir( $dest ) ) { mkdir( $dest, 0777 ); }
1070         $dest .= '/' . substr( $hash, 0, 2 );
1071         if ( ! is_dir( $dest ) ) { mkdir( $dest, 0777 ); }
1072
1073         umask( $oldumask );
1074         return $dest;
1075 }
1076
1077 /**
1078  * Returns the image directory of an image's thubnail
1079  * If the directory does not exist, it is created.
1080  * The result is an absolute path.
1081  *
1082  * This function is called from thumb.php before Setup.php is included
1083  *
1084  * @param string $fname         file name of the original image file
1085  * @param string $subdir        (optional) subdirectory of the image upload directory that should be used for storing the thumbnail. Default is 'thumb'
1086  * @param boolean $shared       (optional) use the shared upload directory
1087  * @access public
1088  */
1089 function wfImageThumbDir( $fname, $shared = false ) {
1090         $base = wfImageArchiveDir( $fname, 'thumb', $shared );
1091         $dir =  "$base/$fname";
1092
1093         if ( !is_dir( $base ) ) {
1094                 $oldumask = umask(0);
1095                 @mkdir( $base, 0777 );
1096                 umask( $oldumask );
1097         }
1098
1099         if ( ! is_dir( $dir ) ) {
1100                 $oldumask = umask(0);
1101                 @mkdir( $dir, 0777 );
1102                 umask( $oldumask );
1103         }
1104
1105         return $dir;
1106 }
1107
1108 /**
1109  * Old thumbnail directory, kept for conversion
1110  */
1111 function wfDeprecatedThumbDir( $thumbName , $subdir='thumb', $shared=false) {
1112         return wfImageArchiveDir( $thumbName, $subdir, $shared );
1113 }
1114
1115 /**
1116  * Returns the image directory of an image's old version
1117  * If the directory does not exist, it is created.
1118  * The result is an absolute path.
1119  *
1120  * This function is called from thumb.php before Setup.php is included
1121  *
1122  * @param string $fname         file name of the thumbnail file, including file size prefix
1123  * @param string $subdir        (optional) subdirectory of the image upload directory that should be used for storing the old version. Default is 'archive'
1124  * @param boolean $shared       (optional) use the shared upload directory (only relevant for other functions which call this one)
1125  * @access public
1126  */
1127 function wfImageArchiveDir( $fname , $subdir='archive', $shared=false ) {
1128         global $wgUploadDirectory, $wgHashedUploadDirectory,
1129                $wgSharedUploadDirectory, $wgHashedSharedUploadDirectory;
1130         $dir = $shared ? $wgSharedUploadDirectory : $wgUploadDirectory;
1131         $hashdir = $shared ? $wgHashedSharedUploadDirectory : $wgHashedUploadDirectory;
1132         if (!$hashdir) { return $dir.'/'.$subdir; }
1133         $hash = md5( $fname );
1134         $oldumask = umask(0);
1135
1136         # Suppress warning messages here; if the file itself can't
1137         # be written we'll worry about it then.
1138         wfSuppressWarnings();
1139
1140         $archive = $dir.'/'.$subdir;
1141         if ( ! is_dir( $archive ) ) { mkdir( $archive, 0777 ); }
1142         $archive .= '/' . $hash{0};
1143         if ( ! is_dir( $archive ) ) { mkdir( $archive, 0777 ); }
1144         $archive .= '/' . substr( $hash, 0, 2 );
1145         if ( ! is_dir( $archive ) ) { mkdir( $archive, 0777 ); }
1146
1147         wfRestoreWarnings();
1148         umask( $oldumask );
1149         return $archive;
1150 }
1151
1152
1153 /*
1154  * Return the hash path component of an image path (URL or filesystem),
1155  * e.g. "/3/3c/", or just "/" if hashing is not used.
1156  *
1157  * @param $dbkey The filesystem / database name of the file
1158  * @param $fromSharedDirectory Use the shared file repository? It may
1159  *   use different hash settings from the local one.
1160  */
1161 function wfGetHashPath ( $dbkey, $fromSharedDirectory = false ) {
1162         global $wgHashedSharedUploadDirectory, $wgSharedUploadDirectory;
1163         global $wgHashedUploadDirectory;
1164
1165         $ishashed = $fromSharedDirectory ? $wgHashedSharedUploadDirectory :
1166                                            $wgHashedUploadDirectory;
1167         if($ishashed) {
1168                 $hash = md5($dbkey);
1169                 return '/' . $hash{0} . '/' . substr( $hash, 0, 2 ) . '/';
1170         } else {
1171                 return '/';
1172         }
1173 }
1174
1175 /**
1176  * Returns the image URL of an image's old version
1177  *
1178  * @param string $fname         file name of the image file
1179  * @param string $subdir        (optional) subdirectory of the image upload directory that is used by the old version. Default is 'archive'
1180  * @access public
1181  */
1182 function wfImageArchiveUrl( $name, $subdir='archive' ) {
1183         global $wgUploadPath, $wgHashedUploadDirectory;
1184
1185         if ($wgHashedUploadDirectory) {
1186                 $hash = md5( substr( $name, 15) );
1187                 $url = $wgUploadPath.'/'.$subdir.'/' . $hash{0} . '/' .
1188                   substr( $hash, 0, 2 ) . '/'.$name;
1189         } else {
1190                 $url = $wgUploadPath.'/'.$subdir.'/'.$name;
1191         }
1192         return wfUrlencode($url);
1193 }
1194
1195 /**
1196  * Return a rounded pixel equivalent for a labeled CSS/SVG length.
1197  * http://www.w3.org/TR/SVG11/coords.html#UnitIdentifiers
1198  *
1199  * @param string $length
1200  * @return int Length in pixels
1201  */
1202 function wfScaleSVGUnit( $length ) {
1203         static $unitLength = array(
1204                 'px' => 1.0,
1205                 'pt' => 1.25,
1206                 'pc' => 15.0,
1207                 'mm' => 3.543307,
1208                 'cm' => 35.43307,
1209                 'in' => 90.0,
1210                 ''   => 1.0, // "User units" pixels by default
1211                 '%'  => 2.0, // Fake it!
1212                 );
1213         if( preg_match( '/^(\d+)(em|ex|px|pt|pc|cm|mm|in|%|)$/', $length, $matches ) ) {
1214                 $length = FloatVal( $matches[1] );
1215                 $unit = $matches[2];
1216                 return round( $length * $unitLength[$unit] );
1217         } else {
1218                 // Assume pixels
1219                 return round( FloatVal( $length ) );
1220         }
1221 }
1222
1223 /**
1224  * Compatible with PHP getimagesize()
1225  * @todo support gzipped SVGZ
1226  * @todo check XML more carefully
1227  * @todo sensible defaults
1228  *
1229  * @param string $filename
1230  * @return array
1231  */
1232 function wfGetSVGsize( $filename ) {
1233         $width = 256;
1234         $height = 256;
1235
1236         // Read a chunk of the file
1237         $f = fopen( $filename, "rt" );
1238         if( !$f ) return false;
1239         $chunk = fread( $f, 4096 );
1240         fclose( $f );
1241
1242         // Uber-crappy hack! Run through a real XML parser.
1243         if( !preg_match( '/<svg\s*([^>]*)\s*>/s', $chunk, $matches ) ) {
1244                 return false;
1245         }
1246         $tag = $matches[1];
1247         if( preg_match( '/\bwidth\s*=\s*("[^"]+"|\'[^\']+\')/s', $tag, $matches ) ) {
1248                 $width = wfScaleSVGUnit( trim( substr( $matches[1], 1, -1 ) ) );
1249         }
1250         if( preg_match( '/\bheight\s*=\s*("[^"]+"|\'[^\']+\')/s', $tag, $matches ) ) {
1251                 $height = wfScaleSVGUnit( trim( substr( $matches[1], 1, -1 ) ) );
1252         }
1253
1254         return array( $width, $height, 'SVG',
1255                 "width=\"$width\" height=\"$height\"" );
1256 }
1257
1258 /**
1259  * Is an image on the bad image list?
1260  */
1261 function wfIsBadImage( $name ) {
1262         global $wgLang;
1263
1264         $lines = explode("\n", wfMsgForContent( 'bad_image_list' ));
1265         foreach ( $lines as $line ) {
1266                 if ( preg_match( '/^\*\s*\[\[:(' . $wgLang->getNsText( NS_IMAGE ) . ':.*(?=]]))\]\]/', $line, $m ) ) {
1267                         $t = Title::newFromText( $m[1] );
1268                         if ( $t->getDBkey() == $name ) {
1269                                 return true;
1270                         }
1271                 }
1272         }
1273         return false;
1274 }
1275
1276
1277
1278 /**
1279  * Wrapper class for thumbnail images
1280  * @package MediaWiki
1281  */
1282 class ThumbnailImage {
1283         /**
1284          * @param string $path Filesystem path to the thumb
1285          * @param string $url URL path to the thumb
1286          * @access private
1287          */
1288         function ThumbnailImage( $url, $width, $height, $path = false ) {
1289                 $this->url = $url;
1290                 $this->width = $width;
1291                 $this->height = $height;
1292                 $this->path = $path;
1293         }
1294
1295         /**
1296          * @return string The thumbnail URL
1297          */
1298         function getUrl() {
1299                 return $this->url;
1300         }
1301
1302         /**
1303          * Return HTML <img ... /> tag for the thumbnail, will include
1304          * width and height attributes and a blank alt text (as required).
1305          *
1306          * You can set or override additional attributes by passing an
1307          * associative array of name => data pairs. The data will be escaped
1308          * for HTML output, so should be in plaintext.
1309          *
1310          * @param array $attribs
1311          * @return string
1312          * @access public
1313          */
1314         function toHtml( $attribs = array() ) {
1315                 $attribs['src'] = $this->url;
1316                 $attribs['width'] = $this->width;
1317                 $attribs['height'] = $this->height;
1318                 if( !isset( $attribs['alt'] ) ) $attribs['alt'] = '';
1319
1320                 $html = '<img ';
1321                 foreach( $attribs as $name => $data ) {
1322                         $html .= $name . '="' . htmlspecialchars( $data ) . '" ';
1323                 }
1324                 $html .= '/>';
1325                 return $html;
1326         }
1327
1328 }
1329 ?>