includes/Image.php

   1 <?php
   2 /**
   3  * @package MediaWiki
   4  */
   5
   6 /**
   7  * NOTE FOR WINDOWS USERS:
   8  * To enable EXIF functions, add the folloing lines to the
   9  * "Windows extensions" section of php.ini:
  10  *
  11  * extension=extensions/php_mbstring.dll
  12  * extension=extensions/php_exif.dll
  13  */
  14
  15 if ($wgShowEXIF)
  16         require_once('Exif.php');
  17
  18 /**
  19  * Bump this number when serialized cache records may be incompatible.
  20  */
  21 define( 'MW_IMAGE_VERSION', 1 );
  22
  23 /**
  24  * Class to represent an image
  25  *
  26  * Provides methods to retrieve paths (physical, logical, URL),
  27  * to generate thumbnails or for uploading.
  28  * @package MediaWiki
  29  */
  30 class Image
  31 {
  32         /**#@+
  33          * @access private
  34          */
  35         var     $name,          # name of the image (constructor)
  36                 $imagePath,     # Path of the image (loadFromXxx)
  37                 $url,           # Image URL (accessor)
  38                 $title,         # Title object for this image (constructor)
  39                 $fileExists,    # does the image file exist on disk? (loadFromXxx)
  40                 $fromSharedDirectory, # load this image from $wgSharedUploadDirectory (loadFromXxx)
  41                 $historyLine,   # Number of line to return by nextHistoryLine() (constructor)
  42                 $historyRes,    # result of the query for the image's history (nextHistoryLine)
  43                 $width,         # \
  44                 $height,        #  |
  45                 $bits,          #   --- returned by getimagesize (loadFromXxx)
  46                 $attr,          # /
  47                 $type,          # MEDIATYPE_xxx (bitmap, drawing, audio...)
  48                 $mime,          # MIME type, determined by MimeMagic::guessMimeType
  49                 $size,          # Size in bytes (loadFromXxx)
  50                 $metadata,      # Metadata
  51                 $dataLoaded;    # Whether or not all this has been loaded from the database (loadFromXxx)
  52
  53
  54         /**#@-*/
  55
  56         /**
  57          * Create an Image object from an image name
  58          *
  59          * @param string $name name of the image, used to create a title object using Title::makeTitleSafe
  60          * @access public
  61          */
  62         function newFromName( $name ) {
  63                 $title = Title::makeTitleSafe( NS_IMAGE, $name );
  64                 return new Image( $title );
  65         }
  66
  67         /**
  68          * Obsolete factory function, use constructor
  69          */
  70         function newFromTitle( $title ) {
  71                 return new Image( $title );
  72         }
  73
  74         function Image( $title ) {
  75                 if( !is_object( $title ) ) {
  76                         wfDebugDieBacktrace( 'Image constructor given bogus title.' );
  77                 }
  78                 $this->title =& $title;
  79                 $this->name = $title->getDBkey();
  80                 $this->metadata = serialize ( array() ) ;
  81
  82                 $n = strrpos( $this->name, '.' );
  83                 $this->extension = strtolower( $n ? substr( $this->name, $n + 1 ) : '' );
  84                 $this->historyLine = 0;
  85
  86                 $this->dataLoaded = false;
  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($cachedValues)
 118                   && isset($cachedValues['version']) && ( $cachedValues['version'] == MW_IMAGE_VERSION )
 119                   && $cachedValues['fileExists'] && isset( $cachedValues['mime'] ) && isset( $cachedValues['metadata'] ) )
 120                 {
 121                         if ( $wgUseSharedUploads && $cachedValues['fromShared']) {
 122                                 # if this is shared file, we need to check if image
 123                                 # in shared repository has not changed
 124                                 if ( isset( $keys[1] ) ) {
 125                                         $commonsCachedValues = $wgMemc->get( $keys[1] );
 126                                         if (!empty($commonsCachedValues) && is_array($commonsCachedValues)
 127                                           && isset($commonsCachedValues['version'])
 128                                           && ( $commonsCachedValues['version'] == MW_IMAGE_VERSION )
 129                                           && isset($commonsCachedValues['mime'])) {
 130                                                 wfDebug( "Pulling image metadata from shared repository cache\n" );
 131                                                 $this->name = $commonsCachedValues['name'];
 132                                                 $this->imagePath = $commonsCachedValues['imagePath'];
 133                                                 $this->fileExists = $commonsCachedValues['fileExists'];
 134                                                 $this->width = $commonsCachedValues['width'];
 135                                                 $this->height = $commonsCachedValues['height'];
 136                                                 $this->bits = $commonsCachedValues['bits'];
 137                                                 $this->type = $commonsCachedValues['type'];
 138                                                 $this->mime = $commonsCachedValues['mime'];
 139                                                 $this->metadata = $commonsCachedValues['metadata'];
 140                                                 $this->size = $commonsCachedValues['size'];
 141                                                 $this->fromSharedDirectory = true;
 142                                                 $this->dataLoaded = true;
 143                                                 $this->imagePath = $this->getFullPath(true);
 144                                         }
 145                                 }
 146                         } else {
 147                                 wfDebug( "Pulling image metadata from local cache\n" );
 148                                 $this->name = $cachedValues['name'];
 149                                 $this->imagePath = $cachedValues['imagePath'];
 150                                 $this->fileExists = $cachedValues['fileExists'];
 151                                 $this->width = $cachedValues['width'];
 152                                 $this->height = $cachedValues['height'];
 153                                 $this->bits = $cachedValues['bits'];
 154                                 $this->type = $cachedValues['type'];
 155                                 $this->mime = $cachedValues['mime'];
 156                                 $this->metadata = $cachedValues['metadata'];
 157                                 $this->size = $cachedValues['size'];
 158                                 $this->fromSharedDirectory = false;
 159                                 $this->dataLoaded = true;
 160                                 $this->imagePath = $this->getFullPath();
 161                         }
 162                 }
 163                 if ( $this->dataLoaded ) {
 164                         wfIncrStats( 'image_cache_hit' );
 165                 } else {
 166                         wfIncrStats( 'image_cache_miss' );
 167                 }
 168
 169                 wfProfileOut( $fname );
 170                 return $this->dataLoaded;
 171         }
 172
 173         /**
 174          * Save the image metadata to memcached
 175          */
 176         function saveToCache() {
 177                 global $wgMemc;
 178                 $this->load();
 179                 $keys = $this->getCacheKeys();
 180                 if ( $this->fileExists ) {
 181                         // We can't cache negative metadata for non-existent files,
 182                         // because if the file later appears in commons, the local
 183                         // keys won't be purged.
 184                         $cachedValues = array(
 185                                 'version'    => MW_IMAGE_VERSION,
 186                                 'name'       => $this->name,
 187                                 'imagePath'  => $this->imagePath,
 188                                 'fileExists' => $this->fileExists,
 189                                 'fromShared' => $this->fromSharedDirectory,
 190                                 'width'      => $this->width,
 191                                 'height'     => $this->height,
 192                                 'bits'       => $this->bits,
 193                                 'type'       => $this->type,
 194                                 'mime'       => $this->mime,
 195                                 'metadata'   => $this->metadata,
 196                                 'size'       => $this->size );
 197
 198                         $wgMemc->set( $keys[0], $cachedValues );
 199                 } else {
 200                         // However we should clear them, so they aren't leftover
 201                         // if we've deleted the file.
 202                         $wgMemc->delete( $keys[0] );
 203                 }
 204         }
 205
 206         /**
 207          * Load metadata from the file itself
 208          */
 209         function loadFromFile() {
 210                 global $wgUseSharedUploads, $wgSharedUploadDirectory, $wgLang,
 211                        $wgShowEXIF;
 212                 $fname = 'Image::loadFromFile';
 213                 wfProfileIn( $fname );
 214                 $this->imagePath = $this->getFullPath();
 215                 $this->fileExists = file_exists( $this->imagePath );
 216                 $this->fromSharedDirectory = false;
 217                 $gis = array();
 218
 219                 if (!$this->fileExists) wfDebug("$fname: ".$this->imagePath." not found locally!\n");
 220
 221                 # If the file is not found, and a shared upload directory is used, look for it there.
 222                 if (!$this->fileExists && $wgUseSharedUploads && $wgSharedUploadDirectory) {
 223                         # In case we're on a wgCapitalLinks=false wiki, we
 224                         # capitalize the first letter of the filename before
 225                         # looking it up in the shared repository.
 226                         $sharedImage = Image::newFromName( $wgLang->ucfirst($this->name) );
 227                         $this->fileExists = file_exists( $sharedImage->getFullPath(true) );
 228                         if ( $this->fileExists ) {
 229                                 $this->name = $sharedImage->name;
 230                                 $this->imagePath = $this->getFullPath(true);
 231                                 $this->fromSharedDirectory = true;
 232                         }
 233                 }
 234
 235
 236                 if ( $this->fileExists ) {
 237                         $magic=& wfGetMimeMagic();
 238
 239                         $this->mime = $magic->guessMimeType($this->imagePath,true);
 240                         $this->type = $magic->getMediaType($this->imagePath,$this->mime);
 241
 242                         # Get size in bytes
 243                         $this->size = filesize( $this->imagePath );
 244
 245                         $magic=& wfGetMimeMagic();
 246
 247                         # Height and width
 248                         if( $this->mime == 'image/svg' ) {
 249                                 wfSuppressWarnings();
 250                                 $gis = wfGetSVGsize( $this->imagePath );
 251                                 wfRestoreWarnings();
 252                         }
 253                         elseif ( !$magic->isPHPImageType( $this->mime ) ) {
 254                                 # Don't try to get the width and height of sound and video files, that's bad for performance
 255                                 $gis[0]= 0; //width
 256                                 $gis[1]= 0; //height
 257                                 $gis[2]= 0; //unknown
 258                                 $gis[3]= ""; //width height string
 259                         }
 260                         else {
 261                                 wfSuppressWarnings();
 262                                 $gis = getimagesize( $this->imagePath );
 263                                 wfRestoreWarnings();
 264                         }
 265
 266                         wfDebug("$fname: ".$this->imagePath." loaded, ".$this->size." bytes, ".$this->mime.".\n");
 267                 }
 268                 else {
 269                         $gis[0]= 0; //width
 270                         $gis[1]= 0; //height
 271                         $gis[2]= 0; //unknown
 272                         $gis[3]= ""; //width height string
 273
 274                         $this->mime = NULL;
 275                         $this->type = MEDIATYPE_UNKNOWN;
 276                         wfDebug("$fname: ".$this->imagePath." NOT FOUND!\n");
 277                 }
 278
 279                 $this->width = $gis[0];
 280                 $this->height = $gis[1];
 281
 282                 #NOTE: $gis[2] contains a code for the image type. This is no longer used.
 283
 284                 #NOTE: we have to set this flag early to avoid load() to be called
 285                 # be some of the functions below. This may lead to recursion or other bad things!
 286                 # as ther's only one thread of execution, this should be safe anyway.
 287                 $this->dataLoaded = true;
 288
 289
 290                 if ($this->fileExists && $wgShowEXIF) $this->metadata = serialize ( $this->retrieveExifData() ) ;
 291                 else $this->metadata = serialize ( array() ) ;
 292
 293                 if ( isset( $gis['bits'] ) )  $this->bits = $gis['bits'];
 294                 else $this->bits = 0;
 295
 296                 wfProfileOut( $fname );
 297         }
 298
 299         /**
 300          * Load image metadata from the DB
 301          */
 302         function loadFromDB() {
 303                 global $wgUseSharedUploads, $wgSharedUploadDBname, $wgSharedUploadDBprefix, $wgLang;
 304                 $fname = 'Image::loadFromDB';
 305                 wfProfileIn( $fname );
 306
 307                 $dbr =& wfGetDB( DB_SLAVE );
 308
 309                 $this->checkDBSchema($dbr);
 310
 311                 $row = $dbr->selectRow( 'image',
 312                         array( 'img_size', 'img_width', 'img_height', 'img_bits',
 313                                'img_media_type', 'img_major_mime', 'img_minor_mime', 'img_metadata' ),
 314                         array( 'img_name' => $this->name ), $fname );
 315                 if ( $row ) {
 316                         $this->fromSharedDirectory = false;
 317                         $this->fileExists = true;
 318                         $this->loadFromRow( $row );
 319                         $this->imagePath = $this->getFullPath();
 320                         // Check for rows from a previous schema, quietly upgrade them
 321                         if ( is_null($this->type) ) {
 322                                 $this->upgradeRow();
 323                         }
 324                 } elseif ( $wgUseSharedUploads && $wgSharedUploadDBname ) {
 325                         # In case we're on a wgCapitalLinks=false wiki, we
 326                         # capitalize the first letter of the filename before
 327                         # looking it up in the shared repository.
 328                         $name = $wgLang->ucfirst($this->name);
 329
 330                         $row = $dbr->selectRow( "`$wgSharedUploadDBname`.{$wgSharedUploadDBprefix}image",
 331                                 array(
 332                                         'img_size', 'img_width', 'img_height', 'img_bits',
 333                                         'img_media_type', 'img_major_mime', 'img_minor_mime', 'img_metadata' ),
 334                                 array( 'img_name' => $name ), $fname );
 335                         if ( $row ) {
 336                                 $this->fromSharedDirectory = true;
 337                                 $this->fileExists = true;
 338                                 $this->imagePath = $this->getFullPath(true);
 339                                 $this->name = $name;
 340                                 $this->loadFromRow( $row );
 341
 342                                 // Check for rows from a previous schema, quietly upgrade them
 343                                 if ( is_null($this->type) ) {
 344                                         $this->upgradeRow();
 345                                 }
 346                         }
 347                 }
 348
 349                 if ( !$row ) {
 350                         $this->size = 0;
 351                         $this->width = 0;
 352                         $this->height = 0;
 353                         $this->bits = 0;
 354                         $this->type = 0;
 355                         $this->fileExists = false;
 356                         $this->fromSharedDirectory = false;
 357                         $this->metadata = serialize ( array() ) ;
 358                 }
 359
 360                 # Unconditionally set loaded=true, we don't want the accessors constantly rechecking
 361                 $this->dataLoaded = true;
 362                 wfProfileOut( $fname );
 363         }
 364
 365         /*
 366          * Load image metadata from a DB result row
 367          */
 368         function loadFromRow( &$row ) {
 369                 $this->size = $row->img_size;
 370                 $this->width = $row->img_width;
 371                 $this->height = $row->img_height;
 372                 $this->bits = $row->img_bits;
 373                 $this->type = $row->img_media_type;
 374
 375                 $major= $row->img_major_mime;
 376                 $minor= $row->img_minor_mime;
 377
 378                 if (!$major) $this->mime = "unknown/unknown";
 379                 else {
 380                         if (!$minor) $minor= "unknown";
 381                         $this->mime = $major.'/'.$minor;
 382                 }
 383
 384                 $this->metadata = $row->img_metadata;
 385                 if ( $this->metadata == "" ) $this->metadata = serialize ( array() ) ;
 386
 387                 $this->dataLoaded = true;
 388         }
 389
 390         /**
 391          * Load image metadata from cache or DB, unless already loaded
 392          */
 393         function load() {
 394                 global $wgSharedUploadDBname, $wgUseSharedUploads;
 395                 if ( !$this->dataLoaded ) {
 396                         if ( !$this->loadFromCache() ) {
 397                                 $this->loadFromDB();
 398                                 if ( !$wgSharedUploadDBname && $wgUseSharedUploads ) {
 399                                         $this->loadFromFile();
 400                                 } elseif ( $this->fileExists ) {
 401                                         $this->saveToCache();
 402                                 }
 403                         }
 404                         $this->dataLoaded = true;
 405                 }
 406         }
 407
 408         /**
 409          * Metadata was loaded from the database, but the row had a marker indicating it needs to be
 410          * upgraded from the 1.4 schema, which had no width, height, bits or type. Upgrade the row.
 411          */
 412         function upgradeRow() {
 413                 global $wgDBname, $wgSharedUploadDBname;
 414                 $fname = 'Image::upgradeRow';
 415                 wfProfileIn( $fname );
 416
 417                 $this->loadFromFile();
 418                 $dbw =& wfGetDB( DB_MASTER );
 419
 420                 if ( $this->fromSharedDirectory ) {
 421                         if ( !$wgSharedUploadDBname ) {
 422                                 wfProfileOut( $fname );
 423                                 return;
 424                         }
 425
 426                         // Write to the other DB using selectDB, not database selectors
 427                         // This avoids breaking replication in MySQL
 428                         $dbw->selectDB( $wgSharedUploadDBname );
 429                 }
 430
 431                 $this->checkDBSchema($dbw);
 432
 433                 if (strpos($this->mime,'/')!==false) {
 434                         list($major,$minor)= explode('/',$this->mime,2);
 435                 }
 436                 else {
 437                         $major= $this->mime;
 438                         $minor= "unknown";
 439                 }
 440
 441                 wfDebug("$fname: upgrading ".$this->name." to 1.5 schema\n");
 442
 443                 $dbw->update( 'image',
 444                         array(
 445                                 'img_width' => $this->width,
 446                                 'img_height' => $this->height,
 447                                 'img_bits' => $this->bits,
 448                                 'img_media_type' => $this->type,
 449                                 'img_major_mime' => $major,
 450                                 'img_minor_mime' => $minor,
 451                                 'img_metadata' => $this->metadata,
 452                         ), array( 'img_name' => $this->name ), $fname
 453                 );
 454                 if ( $this->fromSharedDirectory ) {
 455                         $dbw->selectDB( $wgDBname );
 456                 }
 457                 wfProfileOut( $fname );
 458         }
 459
 460         /**
 461          * Return the name of this image
 462          * @access public
 463          */
 464         function getName() {
 465                 return $this->name;
 466         }
 467
 468         /**
 469          * Return the associated title object
 470          * @access public
 471          */
 472         function getTitle() {
 473                 return $this->title;
 474         }
 475
 476         /**
 477          * Return the URL of the image file
 478          * @access public
 479          */
 480         function getURL() {
 481                 if ( !$this->url ) {
 482                         $this->load();
 483                         if($this->fileExists) {
 484                                 $this->url = Image::imageUrl( $this->name, $this->fromSharedDirectory );
 485                         } else {
 486                                 $this->url = '';
 487                         }
 488                 }
 489                 return $this->url;
 490         }
 491
 492         function getViewURL() {
 493                 if( $this->mustRender()) {
 494                         if( $this->canRender() ) {
 495                                 return $this->createThumb( $this->getWidth() );
 496                         }
 497                         else {
 498                                 wfDebug('Image::getViewURL(): supposed to render '.$this->name.' ('.$this->mime."), but can't!\n");
 499                                 return $this->getURL(); #hm... return NULL?
 500                         }
 501                 } else {
 502                         return $this->getURL();
 503                 }
 504         }
 505
 506         /**
 507          * Return the image path of the image in the
 508          * local file system as an absolute path
 509          * @access public
 510          */
 511         function getImagePath() {
 512                 $this->load();
 513                 return $this->imagePath;
 514         }
 515
 516         /**
 517          * Return the width of the image
 518          *
 519          * Returns -1 if the file specified is not a known image type
 520          * @access public
 521          */
 522         function getWidth() {
 523                 $this->load();
 524                 return $this->width;
 525         }
 526
 527         /**
 528          * Return the height of the image
 529          *
 530          * Returns -1 if the file specified is not a known image type
 531          * @access public
 532          */
 533         function getHeight() {
 534                 $this->load();
 535                 return $this->height;
 536         }
 537
 538         /**
 539          * Return the size of the image file, in bytes
 540          * @access public
 541          */
 542         function getSize() {
 543                 $this->load();
 544                 return $this->size;
 545         }
 546
 547         /**
 548          * Returns the mime type of the file.
 549          */
 550         function getMimeType() {
 551                 $this->load();
 552                 return $this->mime;
 553         }
 554
 555         /**
 556          * Return the type of the media in the file.
 557          * Use the value returned by this function with the MEDIATYPE_xxx constants.
 558          */
 559         function getMediaType() {
 560                 $this->load();
 561                 return $this->type;
 562         }
 563
 564         /**
 565          * Checks if the file can be presented to the browser as a bitmap.
 566          *
 567          * Currently, this checks if the file is an image format
 568          * that can be converted to a format
 569          * supported by all browsers (namely GIF, PNG and JPEG),
 570          * or if it is an SVG image and SVG conversion is enabled.
 571          *
 572          * @todo remember the result of this check.
 573          */
 574         function canRender() {
 575                 global $wgUseImageMagick;
 576
 577                 if( $this->getWidth()<=0 || $this->getHeight()<=0 ) return false;
 578
 579                 $mime= $this->getMimeType();
 580
 581                 if (!$mime || $mime==='unknown' || $mime==='unknown/unknown') return false;
 582
 583                 #if it's SVG, check if ther's a converter enabled
 584                 if ($mime === 'image/svg') {
 585                         global $wgSVGConverters, $wgSVGConverter;
 586
 587                         if ($wgSVGConverter && isset( $wgSVGConverters[$wgSVGConverter])) {
 588                                 return true;
 589                         }
 590                 }
 591
 592                 #image formats available on ALL browsers
 593                 if (  $mime === 'image/gif'
 594                    || $mime === 'image/png'
 595                    || $mime === 'image/jpeg' ) return true;
 596
 597                 #image formats that can be converted to the above formats
 598                 if ($wgUseImageMagick) {
 599                         #convertable by ImageMagick (there are more...)
 600                         if ( $mime === 'image/vnd.wap.wbmp'
 601                           || $mime === 'image/x-xbitmap'
 602                           || $mime === 'image/x-xpixmap'
 603                           #|| $mime === 'image/x-icon'   #file may be split into multiple parts
 604                           || $mime === 'image/x-portable-anymap'
 605                           || $mime === 'image/x-portable-bitmap'
 606                           || $mime === 'image/x-portable-graymap'
 607                           || $mime === 'image/x-portable-pixmap'
 608                           #|| $mime === 'image/x-photoshop'  #this takes a lot of CPU and RAM!
 609                           || $mime === 'image/x-rgb'
 610                           || $mime === 'image/x-bmp'
 611                           || $mime === 'image/tiff' ) return true;
 612                 }
 613                 else {
 614                         #convertable by the PHP GD image lib
 615                         if ( $mime === 'image/vnd.wap.wbmp'
 616                           || $mime === 'image/x-xbitmap' ) return true;
 617                 }
 618
 619                 return false;
 620         }
 621
 622
 623         /**
 624          * Return true if the file is of a type that can't be directly
 625          * rendered by typical browsers and needs to be re-rasterized.
 626          *
 627          * This returns true for everything but the bitmap types
 628          * supported by all browsers, i.e. JPEG; GIF and PNG. It will
 629          * also return true for any non-image formats.
 630          *
 631          * @return bool
 632          */
 633         function mustRender() {
 634                 $mime= $this->getMimeType();
 635
 636                 if (  $mime === "image/gif"
 637                    || $mime === "image/png"
 638                    || $mime === "image/jpeg" ) return false;
 639
 640                 return true;
 641         }
 642
 643         /**
 644          * Determines if this media file may be shown inline on a page.
 645          *
 646          * This is currently synonymous to canRender(), but this could be
 647          * extended to also allow inline display of other media,
 648          * like flash animations or videos. If you do so, please keep in mind that
 649          * that could be a security risk.
 650          */
 651         function allowInlineDisplay() {
 652                 return $this->canRender();
 653         }
 654
 655         /**
 656          * Determines if this media file is in a format that is unlikely to
 657          * contain viruses or malicious content. It uses the global
 658          * $wgTrustedMediaFormats list to determine if the file is safe.
 659          *
 660          * This is used to show a warning on the description page of non-safe files.
 661          * It may also be used to disallow direct [[media:...]] links to such files.
 662          *
 663          * Note that this function will always return ture if allowInlineDisplay()
 664          * or isTrustedFile() is true for this file.
 665          */
 666         function isSafeFile() {
 667                 if ($this->allowInlineDisplay()) return true;
 668                 if ($this->isTrustedFile()) return true;
 669
 670                 global $wgTrustedMediaFormats;
 671
 672                 $type= $this->getMediaType();
 673                 $mime= $this->getMimeType();
 674                 #wfDebug("Image::isSafeFile: type= $type, mime= $mime\n");
 675
 676                 if (!$type || $type===MEDIATYPE_UNKNOWN) return false; #unknown type, not trusted
 677                 if ( in_array( $type, $wgTrustedMediaFormats) ) return true;
 678
 679                 if ($mime==="unknown/unknown") return false; #unknown type, not trusted
 680                 if ( in_array( $mime, $wgTrustedMediaFormats) ) return true;
 681
 682                 return false;
 683         }
 684
 685         /** Returns true if the file is flagegd as trusted. Files flagged that way
 686         * can be linked to directly, even if that is not allowed for this type of
 687         * file normally.
 688         *
 689         * This is a dummy function right now and always returns false. It could be
 690         * implemented to extract a flag from the database. The trusted flag could be
 691         * set on upload, if the user has sufficient privileges, to bypass script-
 692         * and html-filters. It may even be coupeled with cryptographics signatures
 693         * or such.
 694         */
 695         function isTrustedFile() {
 696                 #this could be implemented to check a flag in the databas,
 697                 #look for signatures, etc
 698                 return false;
 699         }
 700
 701         /**
 702          * Return the escapeLocalURL of this image
 703          * @access public
 704          */
 705         function getEscapeLocalURL() {
 706                 $this->getTitle();
 707                 return $this->title->escapeLocalURL();
 708         }
 709
 710         /**
 711          * Return the escapeFullURL of this image
 712          * @access public
 713          */
 714         function getEscapeFullURL() {
 715                 $this->getTitle();
 716                 return $this->title->escapeFullURL();
 717         }
 718
 719         /**
 720          * Return the URL of an image, provided its name.
 721          *
 722          * @param string $name  Name of the image, without the leading "Image:"
 723          * @param boolean $fromSharedDirectory  Should this be in $wgSharedUploadPath?
 724          * @return string URL of $name image
 725          * @access public
 726          * @static
 727          */
 728         function imageUrl( $name, $fromSharedDirectory = false ) {
 729                 global $wgUploadPath,$wgUploadBaseUrl,$wgSharedUploadPath;
 730                 if($fromSharedDirectory) {
 731                         $base = '';
 732                         $path = $wgSharedUploadPath;
 733                 } else {
 734                         $base = $wgUploadBaseUrl;
 735                         $path = $wgUploadPath;
 736                 }
 737                 $url = "{$base}{$path}" .  wfGetHashPath($name, $fromSharedDirectory) . "{$name}";
 738                 return wfUrlencode( $url );
 739         }
 740
 741         /**
 742          * Returns true if the image file exists on disk.
 743          * @return boolean Whether image file exist on disk.
 744          * @access public
 745          */
 746         function exists() {
 747                 $this->load();
 748                 return $this->fileExists;
 749         }
 750
 751         /**
 752          * @todo document
 753          * @access private
 754          */
 755         function thumbUrl( $width, $subdir='thumb') {
 756                 global $wgUploadPath, $wgUploadBaseUrl,
 757                        $wgSharedUploadPath,$wgSharedUploadDirectory,
 758                            $wgSharedThumbnailScriptPath, $wgThumbnailScriptPath;
 759
 760                 // Generate thumb.php URL if possible
 761                 $script = false;
 762                 $url = false;
 763
 764                 if ( $this->fromSharedDirectory ) {
 765                         if ( $wgSharedThumbnailScriptPath ) {
 766                                 $script = $wgSharedThumbnailScriptPath;
 767                         }
 768                 } else {
 769                         if ( $wgThumbnailScriptPath ) {
 770                                 $script = $wgThumbnailScriptPath;
 771                         }
 772                 }
 773                 if ( $script ) {
 774                         $url = $script . '?f=' . urlencode( $this->name ) . '&w=' . urlencode( $width );
 775                         if( $this->mustRender() ) {
 776                                 $url.= '&r=1';
 777                         }
 778                 } else {
 779                         $name = $this->thumbName( $width );
 780                         if($this->fromSharedDirectory) {
 781                                 $base = '';
 782                                 $path = $wgSharedUploadPath;
 783                         } else {
 784                                 $base = $wgUploadBaseUrl;
 785                                 $path = $wgUploadPath;
 786                         }
 787                         if ( Image::isHashed( $this->fromSharedDirectory ) ) {
 788                                 $url = "{$base}{$path}/{$subdir}" .
 789                                 wfGetHashPath($this->name, $this->fromSharedDirectory)
 790                                 . $this->name.'/'.$name;
 791                                 $url = wfUrlencode( $url );
 792                         } else {
 793                                 $url = "{$base}{$path}/{$subdir}/{$name}";
 794                         }
 795                 }
 796                 return array( $script !== false, $url );
 797         }
 798
 799         /**
 800          * Return the file name of a thumbnail of the specified width
 801          *
 802          * @param integer $width        Width of the thumbnail image
 803          * @param boolean $shared       Does the thumbnail come from the shared repository?
 804          * @access private
 805          */
 806         function thumbName( $width ) {
 807                 $thumb = $width."px-".$this->name;
 808
 809                 if( $this->mustRender() ) {
 810                         if( $this->canRender() ) {
 811                                 # Rasterize to PNG (for SVG vector images, etc)
 812                                 $thumb .= '.png';
 813                         }
 814                         else {
 815                                 #should we use iconThumb here to get a symbolic thumbnail?
 816                                 #or should we fail with an internal error?
 817                                 return NULL; //can't make bitmap
 818                         }
 819                 }
 820                 return $thumb;
 821         }
 822
 823         /**
 824          * Create a thumbnail of the image having the specified width/height.
 825          * The thumbnail will not be created if the width is larger than the
 826          * image's width. Let the browser do the scaling in this case.
 827          * The thumbnail is stored on disk and is only computed if the thumbnail
 828          * file does not exist OR if it is older than the image.
 829          * Returns the URL.
 830          *
 831          * Keeps aspect ratio of original image. If both width and height are
 832          * specified, the generated image will be no bigger than width x height,
 833          * and will also have correct aspect ratio.
 834          *
 835          * @param integer $width        maximum width of the generated thumbnail
 836          * @param integer $height       maximum height of the image (optional)
 837          * @access public
 838          */
 839         function createThumb( $width, $height=-1 ) {
 840                 $thumb = $this->getThumbnail( $width, $height );
 841                 if( is_null( $thumb ) ) return '';
 842                 return $thumb->getUrl();
 843         }
 844
 845         /**
 846          * As createThumb, but returns a ThumbnailImage object. This can
 847          * provide access to the actual file, the real size of the thumb,
 848          * and can produce a convenient <img> tag for you.
 849          *
 850          * @param integer $width        maximum width of the generated thumbnail
 851          * @param integer $height       maximum height of the image (optional)
 852          * @return ThumbnailImage
 853          * @access public
 854          */
 855         function getThumbnail( $width, $height=-1 ) {
 856                 if ( $height == -1 ) {
 857                         return $this->renderThumb( $width );
 858                 }
 859                 $this->load();
 860
 861                 if ($this->canRender()) {
 862                         if ( $width < $this->width ) {
 863                                 $thumbheight = $this->height * $width / $this->width;
 864                                 $thumbwidth = $width;
 865                         } else {
 866                                 $thumbheight = $this->height;
 867                                 $thumbwidth = $this->width;
 868                         }
 869                         if ( $thumbheight > $height ) {
 870                                 $thumbwidth = $thumbwidth * $height / $thumbheight;
 871                                 $thumbheight = $height;
 872                         }
 873
 874                         $thumb = $this->renderThumb( $thumbwidth );
 875                 }
 876                 else $thumb= NULL; #not a bitmap or renderable image, don't try.
 877
 878                 if( is_null( $thumb ) ) {
 879                         $thumb = $this->iconThumb();
 880                 }
 881                 return $thumb;
 882         }
 883
 884         /**
 885          * @return ThumbnailImage
 886          */
 887         function iconThumb() {
 888                 global $wgStylePath, $wgStyleDirectory;
 889
 890                 $try = array( 'fileicon-' . $this->extension . '.png', 'fileicon.png' );
 891                 foreach( $try as $icon ) {
 892                         $path = '/common/images/icons/' . $icon;
 893                         $filepath = $wgStyleDirectory . $path;
 894                         if( file_exists( $filepath ) ) {
 895                                 return new ThumbnailImage( $wgStylePath . $path, 120, 120 );
 896                         }
 897                 }
 898                 return null;
 899         }
 900
 901         /**
 902          * Create a thumbnail of the image having the specified width.
 903          * The thumbnail will not be created if the width is larger than the
 904          * image's width. Let the browser do the scaling in this case.
 905          * The thumbnail is stored on disk and is only computed if the thumbnail
 906          * file does not exist OR if it is older than the image.
 907          * Returns an object which can return the pathname, URL, and physical
 908          * pixel size of the thumbnail -- or null on failure.
 909          *
 910          * @return ThumbnailImage
 911          * @access private
 912          */
 913         function renderThumb( $width, $useScript = true ) {
 914                 global $wgUseSquid, $wgInternalServer;
 915                 global $wgThumbnailScriptPath, $wgSharedThumbnailScriptPath;
 916
 917                 $fname = 'Image::renderThumb';
 918                 wfProfileIn( $fname );
 919
 920                 $width = intval( $width );
 921
 922                 $this->load();
 923                 if ( ! $this->exists() )
 924                 {
 925                         # If there is no image, there will be no thumbnail
 926                         wfProfileOut( $fname );
 927                         return null;
 928                 }
 929
 930                 # Sanity check $width
 931                 if( $width <= 0 || $this->width <= 0) {
 932                         # BZZZT
 933                         wfProfileOut( $fname );
 934                         return null;
 935                 }
 936
 937                 if( $width >= $this->width && !$this->mustRender() ) {
 938                         # Don't make an image bigger than the source
 939                         $thumb = new ThumbnailImage( $this->getViewURL(), $this->getWidth(), $this->getHeight() );
 940                         wfProfileOut( $fname );
 941                         return $thumb;
 942                 }
 943
 944                 $height = floor( $this->height * ( $width/$this->width ) );
 945
 946                 list( $isScriptUrl, $url ) = $this->thumbUrl( $width );
 947                 if ( $isScriptUrl && $useScript ) {
 948                         // Use thumb.php to render the image
 949                         $thumb = new ThumbnailImage( $url, $width, $height );
 950                         wfProfileOut( $fname );
 951                         return $thumb;
 952                 }
 953
 954                 $thumbName = $this->thumbName( $width, $this->fromSharedDirectory );
 955                 $thumbPath = wfImageThumbDir( $this->name, $this->fromSharedDirectory ).'/'.$thumbName;
 956
 957                 if ( !file_exists( $thumbPath ) ) {
 958                         $oldThumbPath = wfDeprecatedThumbDir( $thumbName, 'thumb', $this->fromSharedDirectory ).
 959                                 '/'.$thumbName;
 960                         $done = false;
 961                         if ( file_exists( $oldThumbPath ) ) {
 962                                 if ( filemtime($oldThumbPath) >= filemtime($this->imagePath) ) {
 963                                         rename( $oldThumbPath, $thumbPath );
 964                                         $done = true;
 965                                 } else {
 966                                         unlink( $oldThumbPath );
 967                                 }
 968                         }
 969                         if ( !$done ) {
 970                                 $this->reallyRenderThumb( $thumbPath, $width, $height );
 971
 972                                 # Purge squid
 973                                 # This has to be done after the image is updated and present for all machines on NFS,
 974                                 # or else the old version might be stored into the squid again
 975                                 if ( $wgUseSquid ) {
 976                                         if ( substr( $url, 0, 4 ) == 'http' ) {
 977                                                 $urlArr = array( $url );
 978                                         } else {
 979                                                 $urlArr = array( $wgInternalServer.$url );
 980                                         }
 981                                         wfPurgeSquidServers($urlArr);
 982                                 }
 983                         }
 984                 }
 985
 986                 $thumb = new ThumbnailImage( $url, $width, $height, $thumbPath );
 987                 wfProfileOut( $fname );
 988                 return $thumb;
 989         } // END OF function renderThumb
 990
 991         /**
 992          * Really render a thumbnail
 993          * Call this only for images for which canRender() returns true.
 994          *
 995          * @access private
 996          */
 997         function reallyRenderThumb( $thumbPath, $width, $height ) {
 998                 global $wgSVGConverters, $wgSVGConverter,
 999                         $wgUseImageMagick, $wgImageMagickConvertCommand;
1000
1001                 $this->load();
1002
1003                 if( $this->mime === "image/svg" ) {
1004                         #Right now we have only SVG
1005
1006                         global $wgSVGConverters, $wgSVGConverter;
1007                         if( isset( $wgSVGConverters[$wgSVGConverter] ) ) {
1008                                 global $wgSVGConverterPath;
1009                                 $cmd = str_replace(
1010                                         array( '$path/', '$width', '$input', '$output' ),
1011                                         array( $wgSVGConverterPath,
1012                                                    $width,
1013                                                    wfEscapeShellArg( $this->imagePath ),
1014                                                    wfEscapeShellArg( $thumbPath ) ),
1015                                         $wgSVGConverters[$wgSVGConverter] );
1016                                 $conv = shell_exec( $cmd );
1017                         } else {
1018                                 $conv = false;
1019                         }
1020                 } elseif ( $wgUseImageMagick ) {
1021                         # use ImageMagick
1022                         # Specify white background color, will be used for transparent images
1023                         # in Internet Explorer/Windows instead of default black.
1024                         $cmd  =  $wgImageMagickConvertCommand .
1025                                 " -quality 85 -background white -geometry {$width} ".
1026                                 wfEscapeShellArg($this->imagePath) . " " .
1027                                 wfEscapeShellArg($thumbPath);
1028                         wfDebug("reallyRenderThumb: running ImageMagick: $cmd");
1029                         $conv = shell_exec( $cmd );
1030                 } else {
1031                         # Use PHP's builtin GD library functions.
1032                         #
1033                         # First find out what kind of file this is, and select the correct
1034                         # input routine for this.
1035
1036                         $typemap = array(
1037                                 'image/gif'          => array( 'imagecreatefromgif',  'palette',   'imagegif'  ),
1038                                 'image/jpeg'         => array( 'imagecreatefromjpeg', 'truecolor', array( &$this, 'imageJpegWrapper' ) ),
1039                                 'image/png'          => array( 'imagecreatefrompng',  'bits',      'imagepng'  ),
1040                                 'image/vnd.wap.wmbp' => array( 'imagecreatefromwbmp', 'palette',   'imagewbmp'  ),
1041                                 'image/xbm'          => array( 'imagecreatefromxbm',  'palette',   'imagexbm'  ),
1042                         );
1043                         if( !isset( $typemap[$this->mime] ) ) {
1044                                 $err = 'Image type not supported';
1045                                 wfDebug( "$err\n" );
1046                                 return $err;
1047                         }
1048                         list( $loader, $colorStyle, $saveType ) = $typemap[$this->mime];
1049
1050                         if( !function_exists( $loader ) ) {
1051                                 $err = "Incomplete GD library configuration: missing function $loader";
1052                                 wfDebug( "$err\n" );
1053                                 return $err;
1054                         }
1055                         if( $colorStyle == 'palette' ) {
1056                                 $truecolor = false;
1057                         } elseif( $colorStyle == 'truecolor' ) {
1058                                 $truecolor = true;
1059                         } elseif( $colorStyle == 'bits' ) {
1060                                 $truecolor = ( $this->bits > 8 );
1061                         }
1062
1063                         $src_image = call_user_func( $loader, $this->imagePath );
1064                         if ( $truecolor ) {
1065                                 $dst_image = imagecreatetruecolor( $width, $height );
1066                         } else {
1067                                 $dst_image = imagecreate( $width, $height );
1068                         }
1069                         imagecopyresampled( $dst_image, $src_image,
1070                                                 0,0,0,0,
1071                                                 $width, $height, $this->width, $this->height );
1072                         call_user_func( $saveType, $dst_image, $thumbPath );
1073                         imagedestroy( $dst_image );
1074                         imagedestroy( $src_image );
1075                 }
1076
1077                 #
1078                 # Check for zero-sized thumbnails. Those can be generated when
1079                 # no disk space is available or some other error occurs
1080                 #
1081                 if( file_exists( $thumbPath ) ) {
1082                         $thumbstat = stat( $thumbPath );
1083                         if( $thumbstat['size'] == 0 ) {
1084                                 unlink( $thumbPath );
1085                         }
1086                 }
1087         }
1088
1089         function imageJpegWrapper( $dst_image, $thumbPath ) {
1090                 imageinterlace( $dst_image );
1091                 imagejpeg( $dst_image, $thumbPath, 95 );
1092         }
1093
1094         /**
1095          * Get all thumbnail names previously generated for this image
1096          */
1097         function getThumbnails( $shared = false ) {
1098                 if ( Image::isHashed( $shared ) ) {
1099                         $this->load();
1100                         $files = array();
1101                         $dir = wfImageThumbDir( $this->name, $shared );
1102
1103                         // This generates an error on failure, hence the @
1104                         $handle = @opendir( $dir );
1105
1106                         if ( $handle ) {
1107                                 while ( false !== ( $file = readdir($handle) ) ) {
1108                                         if ( $file{0} != '.' ) {
1109                                                 $files[] = $file;
1110                                         }
1111                                 }
1112                                 closedir( $handle );
1113                         }
1114                 } else {
1115                         $files = array();
1116                 }
1117
1118                 return $files;
1119         }
1120
1121         /**
1122          * Delete all previously generated thumbnails, refresh metadata in memcached and purge the squid
1123          */
1124         function purgeCache( $archiveFiles = array(), $shared = false ) {
1125                 global $wgInternalServer, $wgUseSquid;
1126
1127                 // Refresh metadata cache
1128                 clearstatcache();
1129                 $this->loadFromFile();
1130                 $this->saveToCache();
1131
1132                 // Delete thumbnails
1133                 $files = $this->getThumbnails( $shared );
1134                 $dir = wfImageThumbDir( $this->name, $shared );
1135                 $urls = array();
1136                 foreach ( $files as $file ) {
1137                         if ( preg_match( '/^(\d+)px/', $file, $m ) ) {
1138                                 $urls[] = $wgInternalServer . $this->thumbUrl( $m[1], $this->fromSharedDirectory );
1139                                 @unlink( "$dir/$file" );
1140                         }
1141                 }
1142
1143                 // Purge the squid
1144                 if ( $wgUseSquid ) {
1145                         $urls[] = $wgInternalServer . $this->getViewURL();
1146                         foreach ( $archiveFiles as $file ) {
1147                                 $urls[] = $wgInternalServer . wfImageArchiveUrl( $file );
1148                         }
1149                         wfPurgeSquidServers( $urls );
1150                 }
1151         }
1152
1153         function checkDBSchema(&$db) {
1154                 # img_name must be unique
1155                 if ( !$db->indexUnique( 'image', 'img_name' ) && !$db->indexExists('image','PRIMARY') ) {
1156                         wfDebugDieBacktrace( 'Database schema not up to date, please run maintenance/archives/patch-image_name_unique.sql' );
1157                 }
1158
1159                 #new fields must exist
1160                 if ( !$db->fieldExists( 'image', 'img_media_type' )
1161                   || !$db->fieldExists( 'image', 'img_metadata' )
1162                   || !$db->fieldExists( 'image', 'img_width' ) ) {
1163
1164                         wfDebugDieBacktrace( 'Database schema not up to date, please run maintenance/update.php' );
1165                 }
1166         }
1167
1168         /**
1169          * Return the image history of this image, line by line.
1170          * starts with current version, then old versions.
1171          * uses $this->historyLine to check which line to return:
1172          *  0      return line for current version
1173          *  1      query for old versions, return first one
1174          *  2, ... return next old version from above query
1175          *
1176          * @access public
1177          */
1178         function nextHistoryLine() {
1179                 $fname = 'Image::nextHistoryLine()';
1180                 $dbr =& wfGetDB( DB_SLAVE );
1181
1182                 $this->checkDBSchema($dbr);
1183
1184                 if ( $this->historyLine == 0 ) {// called for the first time, return line from cur
1185                         $this->historyRes = $dbr->select( 'image',
1186                                 array( 'img_size','img_description','img_user','img_user_text','img_timestamp', "'' AS oi_archive_name" ),
1187                                 array( 'img_name' => $this->title->getDBkey() ),
1188                                 $fname
1189                         );
1190                         if ( 0 == wfNumRows( $this->historyRes ) ) {
1191                                 return FALSE;
1192                         }
1193                 } else if ( $this->historyLine == 1 ) {
1194                         $this->historyRes = $dbr->select( 'oldimage',
1195                                 array( 'oi_size AS img_size', 'oi_description AS img_description', 'oi_user AS img_user',
1196                                         'oi_user_text AS img_user_text', 'oi_timestamp AS img_timestamp', 'oi_archive_name'
1197                                 ), array( 'oi_name' => $this->title->getDBkey() ), $fname, array( 'ORDER BY' => 'oi_timestamp DESC' )
1198                         );
1199                 }
1200                 $this->historyLine ++;
1201
1202                 return $dbr->fetchObject( $this->historyRes );
1203         }
1204
1205         /**
1206          * Reset the history pointer to the first element of the history
1207          * @access public
1208          */
1209         function resetHistory() {
1210                 $this->historyLine = 0;
1211         }
1212
1213         /**
1214         * Return the full filesystem path to the file. Note that this does
1215         * not mean that a file actually exists under that location.
1216         *
1217         * This path depends on whether directory hashing is active or not,
1218         * i.e. whether the images are all found in the same directory,
1219         * or in hashed paths like /images/3/3c.
1220         *
1221         * @access public
1222         * @param boolean $fromSharedDirectory Return the path to the file
1223         *   in a shared repository (see $wgUseSharedRepository and related
1224         *   options in DefaultSettings.php) instead of a local one.
1225         *
1226         */
1227         function getFullPath( $fromSharedRepository = false ) {
1228                 global $wgUploadDirectory, $wgSharedUploadDirectory;
1229                 global $wgHashedUploadDirectory, $wgHashedSharedUploadDirectory;
1230
1231                 $dir      = $fromSharedRepository ? $wgSharedUploadDirectory :
1232                                                     $wgUploadDirectory;
1233
1234                 // $wgSharedUploadDirectory may be false, if thumb.php is used
1235                 if ( $dir ) {
1236                         $fullpath = $dir . wfGetHashPath($this->name, $fromSharedRepository) . $this->name;
1237                 } else {
1238                         $fullpath = false;
1239                 }
1240
1241                 return $fullpath;
1242         }
1243
1244         /**
1245          * @return bool
1246          * @static
1247          */
1248         function isHashed( $shared ) {
1249                 global $wgHashedUploadDirectory, $wgHashedSharedUploadDirectory;
1250                 return $shared ? $wgHashedSharedUploadDirectory : $wgHashedUploadDirectory;
1251         }
1252
1253         /**
1254          * Record an image upload in the upload log and the image table
1255          */
1256         function recordUpload( $oldver, $desc, $license, $copyStatus = '', $source = '' ) {
1257                 global $wgUser, $wgLang, $wgTitle, $wgDeferredUpdateList;
1258                 global $wgUseCopyrightUpload, $wgUseSquid, $wgPostCommitUpdateList;
1259
1260                 $fname = 'Image::recordUpload';
1261                 $dbw =& wfGetDB( DB_MASTER );
1262
1263                 $this->checkDBSchema($dbw);
1264
1265                 // Delete thumbnails and refresh the metadata cache
1266                 $this->purgeCache();
1267
1268                 // Fail now if the image isn't there
1269                 if ( !$this->fileExists || $this->fromSharedDirectory ) {
1270                         wfDebug( "Image::recordUpload: File ".$this->imagePath." went missing!\n" );
1271                         return false;
1272                 }
1273
1274                 if ( $wgUseCopyrightUpload ) {
1275                         if ( $license != '' ) {
1276                                 $licensetxt = '== ' . wfMsg( 'license' ) . " ==\n" . '{{' . $license . '}}' . "\n";
1277                         }
1278                         $textdesc = '== ' . wfMsg ( 'filedesc' ) . " ==\n" . $desc . "\n" .
1279                           '== ' . wfMsg ( 'filestatus' ) . " ==\n" . $copyStatus . "\n" .
1280                           "$licensetxt" .
1281                           '== ' . wfMsg ( 'filesource' ) . " ==\n" . $source ;
1282                 } else {
1283                         if ( $license != '' ) {
1284                                 $filedesc = $desc == '' ? '' : '== ' . wfMsg ( 'filedesc' ) . " ==\n" . $desc . "\n";
1285                                  $textdesc = $filedesc .
1286                                          '== ' . wfMsg ( 'license' ) . " ==\n" . '{{' . $license . '}}' . "\n";
1287                         } else {
1288                                 $textdesc = $desc;
1289                         }
1290                 }
1291
1292                 $now = $dbw->timestamp();
1293
1294                 #split mime type
1295                 if (strpos($this->mime,'/')!==false) {
1296                         list($major,$minor)= explode('/',$this->mime,2);
1297                 }
1298                 else {
1299                         $major= $this->mime;
1300                         $minor= "unknown";
1301                 }
1302
1303                 # Test to see if the row exists using INSERT IGNORE
1304                 # This avoids race conditions by locking the row until the commit, and also
1305                 # doesn't deadlock. SELECT FOR UPDATE causes a deadlock for every race condition.
1306                 $dbw->insert( 'image',
1307                         array(
1308                                 'img_name' => $this->name,
1309                                 'img_size'=> $this->size,
1310                                 'img_width' => intval( $this->width ),
1311                                 'img_height' => intval( $this->height ),
1312                                 'img_bits' => $this->bits,
1313                                 'img_media_type' => $this->type,
1314                                 'img_major_mime' => $major,
1315                                 'img_minor_mime' => $minor,
1316                                 'img_timestamp' => $now,
1317                                 'img_description' => $desc,
1318                                 'img_user' => $wgUser->getID(),
1319                                 'img_user_text' => $wgUser->getName(),
1320                                 'img_metadata' => $this->metadata,
1321                         ), $fname, 'IGNORE'
1322                 );
1323                 $descTitle = $this->getTitle();
1324                 $purgeURLs = array();
1325
1326                 if ( $dbw->affectedRows() ) {
1327                         # Successfully inserted, this is a new image
1328                         $id = $descTitle->getArticleID();
1329
1330                         if ( $id == 0 ) {
1331                                 $article = new Article( $descTitle );
1332                                 $article->insertNewArticle( $textdesc, $desc, false, false, true );
1333                         }
1334                 } else {
1335                         # Collision, this is an update of an image
1336                         # Insert previous contents into oldimage
1337                         $dbw->insertSelect( 'oldimage', 'image',
1338                                 array(
1339                                         'oi_name' => 'img_name',
1340                                         'oi_archive_name' => $dbw->addQuotes( $oldver ),
1341                                         'oi_size' => 'img_size',
1342                                         'oi_width' => 'img_width',
1343                                         'oi_height' => 'img_height',
1344                                         'oi_bits' => 'img_bits',
1345                                         'oi_timestamp' => 'img_timestamp',
1346                                         'oi_description' => 'img_description',
1347                                         'oi_user' => 'img_user',
1348                                         'oi_user_text' => 'img_user_text',
1349                                 ), array( 'img_name' => $this->name ), $fname
1350                         );
1351
1352                         # Update the current image row
1353                         $dbw->update( 'image',
1354                                 array( /* SET */
1355                                         'img_size' => $this->size,
1356                                         'img_width' => intval( $this->width ),
1357                                         'img_height' => intval( $this->height ),
1358                                         'img_bits' => $this->bits,
1359                                         'img_media_type' => $this->type,
1360                                         'img_major_mime' => $major,
1361                                         'img_minor_mime' => $minor,
1362                                         'img_timestamp' => $now,
1363                                         'img_description' => $desc,
1364                                         'img_user' => $wgUser->getID(),
1365                                         'img_user_text' => $wgUser->getName(),
1366                                         'img_metadata' => $this->metadata,
1367                                 ), array( /* WHERE */
1368                                         'img_name' => $this->name
1369                                 ), $fname
1370                         );
1371
1372                         # Invalidate the cache for the description page
1373                         $descTitle->invalidateCache();
1374                         $purgeURLs[] = $descTitle->getInternalURL();
1375                 }
1376
1377                 # Invalidate cache for all pages using this image
1378                 $linksTo = $this->getLinksTo();
1379
1380                 if ( $wgUseSquid ) {
1381                         $u = SquidUpdate::newFromTitles( $linksTo, $purgeURLs );
1382                         array_push( $wgPostCommitUpdateList, $u );
1383                 }
1384                 Title::touchArray( $linksTo );
1385
1386                 $log = new LogPage( 'upload' );
1387                 $log->addEntry( 'upload', $descTitle, $desc );
1388
1389                 return true;
1390         }
1391
1392         /**
1393          * Get an array of Title objects which are articles which use this image
1394          * Also adds their IDs to the link cache
1395          *
1396          * This is mostly copied from Title::getLinksTo()
1397          */
1398         function getLinksTo( $options = '' ) {
1399                 global $wgLinkCache;
1400                 $fname = 'Image::getLinksTo';
1401                 wfProfileIn( $fname );
1402
1403                 if ( $options ) {
1404                         $db =& wfGetDB( DB_MASTER );
1405                 } else {
1406                         $db =& wfGetDB( DB_SLAVE );
1407                 }
1408
1409                 extract( $db->tableNames( 'page', 'imagelinks' ) );
1410                 $encName = $db->addQuotes( $this->name );
1411                 $sql = "SELECT page_namespace,page_title,page_id FROM $page,$imagelinks WHERE page_id=il_from AND il_to=$encName $options";
1412                 $res = $db->query( $sql, $fname );
1413
1414                 $retVal = array();
1415                 if ( $db->numRows( $res ) ) {
1416                         while ( $row = $db->fetchObject( $res ) ) {
1417                                 if ( $titleObj = Title::makeTitle( $row->page_namespace, $row->page_title ) ) {
1418                                         $wgLinkCache->addGoodLinkObj( $row->page_id, $titleObj );
1419                                         $retVal[] = $titleObj;
1420                                 }
1421                         }
1422                 }
1423                 $db->freeResult( $res );
1424                 return $retVal;
1425         }
1426         /**
1427          * Retrive Exif data from the database
1428          *
1429          * Retrive Exif data from the database and prune unrecognized tags
1430          * and/or tags with invalid contents
1431          *
1432          * @return array
1433          */
1434         function retrieveExifData () {
1435                 if ( $this->getMimeType() !== "image/jpeg" ) return array ();
1436
1437                 $exif = new Exif( $this->imagePath );
1438                 return $exif->getFilteredData();
1439         }
1440
1441         function getExifData () {
1442                 global $wgRequest;
1443                 if ( $this->metadata === '0' )
1444                         return array();
1445
1446                 $purge = $wgRequest->getVal( 'action' ) == 'purge';
1447                 $ret = unserialize ( $this->metadata );
1448
1449                 $oldver = isset( $ret['MEDIAWIKI_EXIF_VERSION'] ) ? $ret['MEDIAWIKI_EXIF_VERSION'] : 0;
1450                 $newver = Exif::version();
1451
1452                 if ( !count( $ret ) || $purge || $oldver != $newver ) {
1453                         $this->updateExifData( $newver );
1454                 }
1455                 if ( isset( $ret['MEDIAWIKI_EXIF_VERSION'] ) )
1456                         unset( $ret['MEDIAWIKI_EXIF_VERSION'] );
1457                 $format = new FormatExif( $ret );
1458                 return $format->getFormattedData();
1459         }
1460
1461         function updateExifData( $version ) {
1462                 $fname = 'Image:updateExifData';
1463
1464                 if ( $this->getImagePath() === false ) # Not a local image
1465                         return;
1466
1467                 # Get EXIF data from image
1468                 $exif = $this->retrieveExifData();
1469                 if ( count( $exif ) ) {
1470                         $exif['MEDIAWIKI_EXIF_VERSION'] = $version;
1471                         $this->metadata = serialize( $exif );
1472                 } else {
1473                         $this->metadata = '0';
1474                 }
1475
1476                 # Update EXIF data in database
1477                 $dbw =& wfGetDB( DB_MASTER );
1478
1479                 $this->checkDBSchema($dbw);
1480
1481                 $dbw->update( 'image',
1482                         array( 'img_metadata' => $this->metadata ),
1483                         array( 'img_name' => $this->name ),
1484                         $fname
1485                 );
1486         }
1487
1488 } //class
1489
1490
1491 /**
1492  * Returns the image directory of an image
1493  * If the directory does not exist, it is created.
1494  * The result is an absolute path.
1495  *
1496  * This function is called from thumb.php before Setup.php is included
1497  *
1498  * @param string $fname         file name of the image file
1499  * @access public
1500  */
1501 function wfImageDir( $fname ) {
1502         global $wgUploadDirectory, $wgHashedUploadDirectory;
1503
1504         if (!$wgHashedUploadDirectory) { return $wgUploadDirectory; }
1505
1506         $hash = md5( $fname );
1507         $oldumask = umask(0);
1508         $dest = $wgUploadDirectory . '/' . $hash{0};
1509         if ( ! is_dir( $dest ) ) { mkdir( $dest, 0777 ); }
1510         $dest .= '/' . substr( $hash, 0, 2 );
1511         if ( ! is_dir( $dest ) ) { mkdir( $dest, 0777 ); }
1512
1513         umask( $oldumask );
1514         return $dest;
1515 }
1516
1517 /**
1518  * Returns the image directory of an image's thubnail
1519  * If the directory does not exist, it is created.
1520  * The result is an absolute path.
1521  *
1522  * This function is called from thumb.php before Setup.php is included
1523  *
1524  * @param string $fname         file name of the original image file
1525  * @param string $subdir        (optional) subdirectory of the image upload directory that should be used for storing the thumbnail. Default is 'thumb'
1526  * @param boolean $shared       (optional) use the shared upload directory
1527  * @access public
1528  */
1529 function wfImageThumbDir( $fname, $shared = false ) {
1530         $base = wfImageArchiveDir( $fname, 'thumb', $shared );
1531         if ( Image::isHashed( $shared ) ) {
1532                 $dir =  "$base/$fname";
1533
1534                 if ( !is_dir( $base ) ) {
1535                         $oldumask = umask(0);
1536                         @mkdir( $base, 0777 );
1537                         umask( $oldumask );
1538                 }
1539
1540                 if ( ! is_dir( $dir ) ) {
1541                         $oldumask = umask(0);
1542                         @mkdir( $dir, 0777 );
1543                         umask( $oldumask );
1544                 }
1545         } else {
1546                 $dir = $base;
1547         }
1548
1549         return $dir;
1550 }
1551
1552 /**
1553  * Old thumbnail directory, kept for conversion
1554  */
1555 function wfDeprecatedThumbDir( $thumbName , $subdir='thumb', $shared=false) {
1556         return wfImageArchiveDir( $thumbName, $subdir, $shared );
1557 }
1558
1559 /**
1560  * Returns the image directory of an image's old version
1561  * If the directory does not exist, it is created.
1562  * The result is an absolute path.
1563  *
1564  * This function is called from thumb.php before Setup.php is included
1565  *
1566  * @param string $fname         file name of the thumbnail file, including file size prefix
1567  * @param string $subdir        (optional) subdirectory of the image upload directory that should be used for storing the old version. Default is 'archive'
1568  * @param boolean $shared       (optional) use the shared upload directory (only relevant for other functions which call this one)
1569  * @access public
1570  */
1571 function wfImageArchiveDir( $fname , $subdir='archive', $shared=false ) {
1572         global $wgUploadDirectory, $wgHashedUploadDirectory,
1573                $wgSharedUploadDirectory, $wgHashedSharedUploadDirectory;
1574         $dir = $shared ? $wgSharedUploadDirectory : $wgUploadDirectory;
1575         $hashdir = $shared ? $wgHashedSharedUploadDirectory : $wgHashedUploadDirectory;
1576         if (!$hashdir) { return $dir.'/'.$subdir; }
1577         $hash = md5( $fname );
1578         $oldumask = umask(0);
1579
1580         # Suppress warning messages here; if the file itself can't
1581         # be written we'll worry about it then.
1582         wfSuppressWarnings();
1583
1584         $archive = $dir.'/'.$subdir;
1585         if ( ! is_dir( $archive ) ) { mkdir( $archive, 0777 ); }
1586         $archive .= '/' . $hash{0};
1587         if ( ! is_dir( $archive ) ) { mkdir( $archive, 0777 ); }
1588         $archive .= '/' . substr( $hash, 0, 2 );
1589         if ( ! is_dir( $archive ) ) { mkdir( $archive, 0777 ); }
1590
1591         wfRestoreWarnings();
1592         umask( $oldumask );
1593         return $archive;
1594 }
1595
1596
1597 /*
1598  * Return the hash path component of an image path (URL or filesystem),
1599  * e.g. "/3/3c/", or just "/" if hashing is not used.
1600  *
1601  * @param $dbkey The filesystem / database name of the file
1602  * @param $fromSharedDirectory Use the shared file repository? It may
1603  *   use different hash settings from the local one.
1604  */
1605 function wfGetHashPath ( $dbkey, $fromSharedDirectory = false ) {
1606         global $wgHashedSharedUploadDirectory, $wgSharedUploadDirectory;
1607         global $wgHashedUploadDirectory;
1608
1609         if( Image::isHashed( $fromSharedDirectory ) ) {
1610                 $hash = md5($dbkey);
1611                 return '/' . $hash{0} . '/' . substr( $hash, 0, 2 ) . '/';
1612         } else {
1613                 return '/';
1614         }
1615 }
1616
1617 /**
1618  * Returns the image URL of an image's old version
1619  *
1620  * @param string $fname         file name of the image file
1621  * @param string $subdir        (optional) subdirectory of the image upload directory that is used by the old version. Default is 'archive'
1622  * @access public
1623  */
1624 function wfImageArchiveUrl( $name, $subdir='archive' ) {
1625         global $wgUploadPath, $wgHashedUploadDirectory;
1626
1627         if ($wgHashedUploadDirectory) {
1628                 $hash = md5( substr( $name, 15) );
1629                 $url = $wgUploadPath.'/'.$subdir.'/' . $hash{0} . '/' .
1630                   substr( $hash, 0, 2 ) . '/'.$name;
1631         } else {
1632                 $url = $wgUploadPath.'/'.$subdir.'/'.$name;
1633         }
1634         return wfUrlencode($url);
1635 }
1636
1637 /**
1638  * Return a rounded pixel equivalent for a labeled CSS/SVG length.
1639  * http://www.w3.org/TR/SVG11/coords.html#UnitIdentifiers
1640  *
1641  * @param string $length
1642  * @return int Length in pixels
1643  */
1644 function wfScaleSVGUnit( $length ) {
1645         static $unitLength = array(
1646                 'px' => 1.0,
1647                 'pt' => 1.25,
1648                 'pc' => 15.0,
1649                 'mm' => 3.543307,
1650                 'cm' => 35.43307,
1651                 'in' => 90.0,
1652                 ''   => 1.0, // "User units" pixels by default
1653                 '%'  => 2.0, // Fake it!
1654                 );
1655         if( preg_match( '/^(\d+)(em|ex|px|pt|pc|cm|mm|in|%|)$/', $length, $matches ) ) {
1656                 $length = floatval( $matches[1] );
1657                 $unit = $matches[2];
1658                 return round( $length * $unitLength[$unit] );
1659         } else {
1660                 // Assume pixels
1661                 return round( floatval( $length ) );
1662         }
1663 }
1664
1665 /**
1666  * Compatible with PHP getimagesize()
1667  * @todo support gzipped SVGZ
1668  * @todo check XML more carefully
1669  * @todo sensible defaults
1670  *
1671  * @param string $filename
1672  * @return array
1673  */
1674 function wfGetSVGsize( $filename ) {
1675         $width = 256;
1676         $height = 256;
1677
1678         // Read a chunk of the file
1679         $f = fopen( $filename, "rt" );
1680         if( !$f ) return false;
1681         $chunk = fread( $f, 4096 );
1682         fclose( $f );
1683
1684         // Uber-crappy hack! Run through a real XML parser.
1685         if( !preg_match( '/<svg\s*([^>]*)\s*>/s', $chunk, $matches ) ) {
1686                 return false;
1687         }
1688         $tag = $matches[1];
1689         if( preg_match( '/\bwidth\s*=\s*("[^"]+"|\'[^\']+\')/s', $tag, $matches ) ) {
1690                 $width = wfScaleSVGUnit( trim( substr( $matches[1], 1, -1 ) ) );
1691         }
1692         if( preg_match( '/\bheight\s*=\s*("[^"]+"|\'[^\']+\')/s', $tag, $matches ) ) {
1693                 $height = wfScaleSVGUnit( trim( substr( $matches[1], 1, -1 ) ) );
1694         }
1695
1696         return array( $width, $height, 'SVG',
1697                 "width=\"$width\" height=\"$height\"" );
1698 }
1699
1700 /**
1701  * Determine if an image exists on the 'bad image list'
1702  *
1703  * @param string $name The image to check
1704  * @return bool
1705  */
1706 function wfIsBadImage( $name ) {
1707         global $wgContLang;
1708         static $titleList = false;
1709         if ( $titleList === false ) {
1710                 $titleList = array();
1711
1712                 $lines = explode("\n", wfMsgForContent( 'bad_image_list' ));
1713                 foreach ( $lines as $line ) {
1714                         if ( preg_match( '/^\*\s*\[{2}:(' . $wgContLang->getNsText( NS_IMAGE ) . ':.*?)\]{2}/', $line, $m ) ) {
1715                                 $t = Title::newFromText( $m[1] );
1716                                 $titleList[$t->getDBkey()] = 1;
1717                         }
1718                 }
1719         }
1720
1721         return array_key_exists( $name, $titleList );
1722 }
1723
1724
1725
1726 /**
1727  * Wrapper class for thumbnail images
1728  * @package MediaWiki
1729  */
1730 class ThumbnailImage {
1731         /**
1732          * @param string $path Filesystem path to the thumb
1733          * @param string $url URL path to the thumb
1734          * @access private
1735          */
1736         function ThumbnailImage( $url, $width, $height, $path = false ) {
1737                 $this->url = $url;
1738                 $this->width = $width;
1739                 $this->height = $height;
1740                 $this->path = $path;
1741         }
1742
1743         /**
1744          * @return string The thumbnail URL
1745          */
1746         function getUrl() {
1747                 return $this->url;
1748         }
1749
1750         /**
1751          * Return HTML <img ... /> tag for the thumbnail, will include
1752          * width and height attributes and a blank alt text (as required).
1753          *
1754          * You can set or override additional attributes by passing an
1755          * associative array of name => data pairs. The data will be escaped
1756          * for HTML output, so should be in plaintext.
1757          *
1758          * @param array $attribs
1759          * @return string
1760          * @access public
1761          */
1762         function toHtml( $attribs = array() ) {
1763                 $attribs['src'] = $this->url;
1764                 $attribs['width'] = $this->width;
1765                 $attribs['height'] = $this->height;
1766                 if( !isset( $attribs['alt'] ) ) $attribs['alt'] = '';
1767
1768                 $html = '<img ';
1769                 foreach( $attribs as $name => $data ) {
1770                         $html .= $name . '="' . htmlspecialchars( $data ) . '" ';
1771                 }
1772                 $html .= '/>';
1773                 return $html;
1774         }
1775
1776 }
1777 ?>