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