includes/filerepo/File.php

   1 <?php
   2
   3 /**
   4  * Implements some public methods and some protected utility functions which
   5  * are required by multiple child classes. Contains stub functionality for
   6  * unimplemented public methods.
   7  *
   8  * Stub functions which should be overridden are marked with STUB. Some more
   9  * concrete functions are also typically overridden by child classes.
  10  *
  11  * Note that only the repo object knows what its file class is called. You should
  12  * never name a file class explictly outside of the repo class. Instead use the
  13  * repo's factory functions to generate file objects, for example:
  14  *
  15  * RepoGroup::singleton()->getLocalRepo()->newFile($title);
  16  *
  17  * The convenience functions wfLocalFile() and wfFindFile() should be sufficient
  18  * in most cases.
  19  *
  20  * @ingroup FileRepo
  21  */
  22 abstract class File {
  23         const DELETED_FILE = 1;
  24         const DELETED_COMMENT = 2;
  25         const DELETED_USER = 4;
  26         const DELETED_RESTRICTED = 8;
  27         const RENDER_NOW = 1;
  28
  29         const DELETE_SOURCE = 1;
  30
  31         /**
  32          * Some member variables can be lazy-initialised using __get(). The
  33          * initialisation function for these variables is always a function named
  34          * like getVar(), where Var is the variable name with upper-case first
  35          * letter.
  36          *
  37          * The following variables are initialised in this way in this base class:
  38          *    name, extension, handler, path, canRender, isSafeFile,
  39          *    transformScript, hashPath, pageCount, url
  40          *
  41          * Code within this class should generally use the accessor function
  42          * directly, since __get() isn't re-entrant and therefore causes bugs that
  43          * depend on initialisation order.
  44          */
  45
  46         /**
  47          * The following member variables are not lazy-initialised
  48          */
  49         var $repo, $title, $lastError, $redirected, $redirectedTitle;
  50
  51         /**
  52          * Call this constructor from child classes
  53          */
  54         function __construct( $title, $repo ) {
  55                 $this->title = $title;
  56                 $this->repo = $repo;
  57         }
  58
  59         function __get( $name ) {
  60                 $function = array( $this, 'get' . ucfirst( $name ) );
  61                 if ( !is_callable( $function ) ) {
  62                         return null;
  63                 } else {
  64                         $this->$name = call_user_func( $function );
  65                         return $this->$name;
  66                 }
  67         }
  68
  69         /**
  70          * Normalize a file extension to the common form, and ensure it's clean.
  71          * Extensions with non-alphanumeric characters will be discarded.
  72          *
  73          * @param $ext string (without the .)
  74          * @return string
  75          */
  76         static function normalizeExtension( $ext ) {
  77                 $lower = strtolower( $ext );
  78                 $squish = array(
  79                         'htm' => 'html',
  80                         'jpeg' => 'jpg',
  81                         'mpeg' => 'mpg',
  82                         'tiff' => 'tif',
  83                         'ogv' => 'ogg' );
  84                 if( isset( $squish[$lower] ) ) {
  85                         return $squish[$lower];
  86                 } elseif( preg_match( '/^[0-9a-z]+$/', $lower ) ) {
  87                         return $lower;
  88                 } else {
  89                         return '';
  90                 }
  91         }
  92
  93         /**
  94          * Checks if file extensions are compatible
  95          *
  96          * @param $old File Old file
  97          * @param $new string New name
  98          */
  99         static function checkExtensionCompatibility( File $old, $new ) {
 100                 $oldMime = $old->getMimeType();
 101                 $n = strrpos( $new, '.' );
 102                 $newExt = self::normalizeExtension(
 103                         $n ? substr( $new, $n + 1 ) : '' );
 104                 $mimeMagic = MimeMagic::singleton();
 105                 return $mimeMagic->isMatchingExtension( $newExt, $oldMime );
 106         }
 107
 108         /**
 109          * Upgrade the database row if there is one
 110          * Called by ImagePage
 111          * STUB
 112          */
 113         function upgradeRow() {}
 114
 115         /**
 116          * Split an internet media type into its two components; if not
 117          * a two-part name, set the minor type to 'unknown'.
 118          *
 119          * @param $mime "text/html" etc
 120          * @return array ("text", "html") etc
 121          */
 122         static function splitMime( $mime ) {
 123                 if( strpos( $mime, '/' ) !== false ) {
 124                         return explode( '/', $mime, 2 );
 125                 } else {
 126                         return array( $mime, 'unknown' );
 127                 }
 128         }
 129
 130         /**
 131          * Return the name of this file
 132          */
 133         public function getName() {
 134                 if ( !isset( $this->name ) ) {
 135                         $this->name = $this->repo->getNameFromTitle( $this->title );
 136                 }
 137                 return $this->name;
 138         }
 139
 140         /**
 141          * Get the file extension, e.g. "svg"
 142          */
 143         function getExtension() {
 144                 if ( !isset( $this->extension ) ) {
 145                         $n = strrpos( $this->getName(), '.' );
 146                         $this->extension = self::normalizeExtension(
 147                                 $n ? substr( $this->getName(), $n + 1 ) : '' );
 148                 }
 149                 return $this->extension;
 150         }
 151
 152         /**
 153          * Return the associated title object
 154          */
 155         public function getTitle() { return $this->title; }
 156
 157         /**
 158          * Return the title used to find this file
 159          */
 160         public function getOriginalTitle() {
 161                 if ( $this->redirected )
 162                         return $this->getRedirectedTitle();
 163                 return $this->title;
 164         }
 165
 166         /**
 167          * Return the URL of the file
 168          */
 169         public function getUrl() {
 170                 if ( !isset( $this->url ) ) {
 171                         $this->url = $this->repo->getZoneUrl( 'public' ) . '/' . $this->getUrlRel();
 172                 }
 173                 return $this->url;
 174         }
 175
 176         /**
 177          * Return a fully-qualified URL to the file.
 178          * Upload URL paths _may or may not_ be fully qualified, so
 179          * we check. Local paths are assumed to belong on $wgServer.
 180          * @return string
 181          */
 182         public function getFullUrl() {
 183                 return wfExpandUrl( $this->getUrl() );
 184         }
 185
 186         function getViewURL() {
 187                 if( $this->mustRender()) {
 188                         if( $this->canRender() ) {
 189                                 return $this->createThumb( $this->getWidth() );
 190                         }
 191                         else {
 192                                 wfDebug(__METHOD__.': supposed to render '.$this->getName().' ('.$this->getMimeType()."), but can't!\n");
 193                                 return $this->getURL(); #hm... return NULL?
 194                         }
 195                 } else {
 196                         return $this->getURL();
 197                 }
 198         }
 199
 200         /**
 201         * Return the full filesystem path to the file. Note that this does
 202         * not mean that a file actually exists under that location.
 203         *
 204         * This path depends on whether directory hashing is active or not,
 205         * i.e. whether the files are all found in the same directory,
 206         * or in hashed paths like /images/3/3c.
 207         *
 208         * May return false if the file is not locally accessible.
 209         */
 210         public function getPath() {
 211                 if ( !isset( $this->path ) ) {
 212                         $this->path = $this->repo->getZonePath('public') . '/' . $this->getRel();
 213                 }
 214                 return $this->path;
 215         }
 216
 217         /**
 218         * Alias for getPath()
 219         */
 220         public function getFullPath() {
 221                 return $this->getPath();
 222         }
 223
 224         /**
 225          * Return the width of the image. Returns false if the width is unknown
 226          * or undefined.
 227          *
 228          * STUB
 229          * Overridden by LocalFile, UnregisteredLocalFile
 230          */
 231         public function getWidth( $page = 1 ) { return false; }
 232
 233         /**
 234          * Return the height of the image. Returns false if the height is unknown
 235          * or undefined
 236          *
 237          * STUB
 238          * Overridden by LocalFile, UnregisteredLocalFile
 239          */
 240         public function getHeight( $page = 1 ) { return false; }
 241
 242         /**
 243          * Returns ID or name of user who uploaded the file
 244          * STUB
 245          *
 246          * @param $type string 'text' or 'id'
 247          */
 248         public function getUser( $type='text' ) { return null; }
 249
 250         /**
 251          * Get the duration of a media file in seconds
 252          */
 253         public function getLength() {
 254                 $handler = $this->getHandler();
 255                 if ( $handler ) {
 256                         return $handler->getLength( $this );
 257                 } else {
 258                         return 0;
 259                 }
 260         }
 261
 262         /**
 263          * Get handler-specific metadata
 264          * Overridden by LocalFile, UnregisteredLocalFile
 265          * STUB
 266          */
 267         public function getMetadata() { return false; }
 268
 269         /**
 270          * Return the bit depth of the file
 271          * Overridden by LocalFile
 272          * STUB
 273          */
 274         public function getBitDepth() { return 0; }
 275
 276         /**
 277          * Return the size of the image file, in bytes
 278          * Overridden by LocalFile, UnregisteredLocalFile
 279          * STUB
 280          */
 281         public function getSize() { return false; }
 282
 283         /**
 284          * Returns the mime type of the file.
 285          * Overridden by LocalFile, UnregisteredLocalFile
 286          * STUB
 287          */
 288         function getMimeType() { return 'unknown/unknown'; }
 289
 290         /**
 291          * Return the type of the media in the file.
 292          * Use the value returned by this function with the MEDIATYPE_xxx constants.
 293          * Overridden by LocalFile,
 294          * STUB
 295          */
 296         function getMediaType() { return MEDIATYPE_UNKNOWN; }
 297
 298         /**
 299          * Checks if the output of transform() for this file is likely
 300          * to be valid. If this is false, various user elements will
 301          * display a placeholder instead.
 302          *
 303          * Currently, this checks if the file is an image format
 304          * that can be converted to a format
 305          * supported by all browsers (namely GIF, PNG and JPEG),
 306          * or if it is an SVG image and SVG conversion is enabled.
 307          */
 308         function canRender() {
 309                 if ( !isset( $this->canRender ) ) {
 310                         $this->canRender = $this->getHandler() && $this->handler->canRender( $this );
 311                 }
 312                 return $this->canRender;
 313         }
 314
 315         /**
 316          * Accessor for __get()
 317          */
 318         protected function getCanRender() {
 319                 return $this->canRender();
 320         }
 321
 322         /**
 323          * Return true if the file is of a type that can't be directly
 324          * rendered by typical browsers and needs to be re-rasterized.
 325          *
 326          * This returns true for everything but the bitmap types
 327          * supported by all browsers, i.e. JPEG; GIF and PNG. It will
 328          * also return true for any non-image formats.
 329          *
 330          * @return bool
 331          */
 332         function mustRender() {
 333                 return $this->getHandler() && $this->handler->mustRender( $this );
 334         }
 335
 336         /**
 337          * Alias for canRender()
 338          */
 339         function allowInlineDisplay() {
 340                 return $this->canRender();
 341         }
 342
 343         /**
 344          * Determines if this media file is in a format that is unlikely to
 345          * contain viruses or malicious content. It uses the global
 346          * $wgTrustedMediaFormats list to determine if the file is safe.
 347          *
 348          * This is used to show a warning on the description page of non-safe files.
 349          * It may also be used to disallow direct [[media:...]] links to such files.
 350          *
 351          * Note that this function will always return true if allowInlineDisplay()
 352          * or isTrustedFile() is true for this file.
 353          */
 354         function isSafeFile() {
 355                 if ( !isset( $this->isSafeFile ) ) {
 356                         $this->isSafeFile = $this->_getIsSafeFile();
 357                 }
 358                 return $this->isSafeFile;
 359         }
 360
 361         /** Accessor for __get() */
 362         protected function getIsSafeFile() {
 363                 return $this->isSafeFile();
 364         }
 365
 366         /** Uncached accessor */
 367         protected function _getIsSafeFile() {
 368                 if ($this->allowInlineDisplay()) return true;
 369                 if ($this->isTrustedFile()) return true;
 370
 371                 global $wgTrustedMediaFormats;
 372
 373                 $type= $this->getMediaType();
 374                 $mime= $this->getMimeType();
 375                 #wfDebug("LocalFile::isSafeFile: type= $type, mime= $mime\n");
 376
 377                 if (!$type || $type===MEDIATYPE_UNKNOWN) return false; #unknown type, not trusted
 378                 if ( in_array( $type, $wgTrustedMediaFormats) ) return true;
 379
 380                 if ($mime==="unknown/unknown") return false; #unknown type, not trusted
 381                 if ( in_array( $mime, $wgTrustedMediaFormats) ) return true;
 382
 383                 return false;
 384         }
 385
 386         /** Returns true if the file is flagged as trusted. Files flagged that way
 387         * can be linked to directly, even if that is not allowed for this type of
 388         * file normally.
 389         *
 390         * This is a dummy function right now and always returns false. It could be
 391         * implemented to extract a flag from the database. The trusted flag could be
 392         * set on upload, if the user has sufficient privileges, to bypass script-
 393         * and html-filters. It may even be coupled with cryptographics signatures
 394         * or such.
 395         */
 396         function isTrustedFile() {
 397                 #this could be implemented to check a flag in the databas,
 398                 #look for signatures, etc
 399                 return false;
 400         }
 401
 402         /**
 403          * Returns true if file exists in the repository.
 404          *
 405          * Overridden by LocalFile to avoid unnecessary stat calls.
 406          *
 407          * @return boolean Whether file exists in the repository.
 408          */
 409         public function exists() {
 410                 return $this->getPath() && file_exists( $this->path );
 411         }
 412
 413         /**
 414          * Returns true if file exists in the repository and can be included in a page.
 415          * It would be unsafe to include private images, making public thumbnails inadvertently
 416          *
 417          * @return boolean Whether file exists in the repository and is includable.
 418          * @public
 419          */
 420         function isVisible() {
 421                 return $this->exists();
 422         }
 423
 424         function getTransformScript() {
 425                 if ( !isset( $this->transformScript ) ) {
 426                         $this->transformScript = false;
 427                         if ( $this->repo ) {
 428                                 $script = $this->repo->getThumbScriptUrl();
 429                                 if ( $script ) {
 430                                         $this->transformScript = "$script?f=" . urlencode( $this->getName() );
 431                                 }
 432                         }
 433                 }
 434                 return $this->transformScript;
 435         }
 436
 437         /**
 438          * Get a ThumbnailImage which is the same size as the source
 439          */
 440         function getUnscaledThumb( $page = false ) {
 441                 $width = $this->getWidth( $page );
 442                 if ( !$width ) {
 443                         return $this->iconThumb();
 444                 }
 445                 if ( $page ) {
 446                         $params = array(
 447                                 'page' => $page,
 448                                 'width' => $this->getWidth( $page )
 449                         );
 450                 } else {
 451                         $params = array( 'width' => $this->getWidth() );
 452                 }
 453                 return $this->transform( $params );
 454         }
 455
 456         /**
 457          * Return the file name of a thumbnail with the specified parameters
 458          *
 459          * @param array $params Handler-specific parameters
 460          * @private -ish
 461          */
 462         function thumbName( $params ) {
 463                 if ( !$this->getHandler() ) {
 464                         return null;
 465                 }
 466                 $extension = $this->getExtension();
 467                 list( $thumbExt, $thumbMime ) = $this->handler->getThumbType( $extension, $this->getMimeType() );
 468                 $thumbName = $this->handler->makeParamString( $params ) . '-' . $this->getName();
 469                 if ( $thumbExt != $extension ) {
 470                         $thumbName .= ".$thumbExt";
 471                 }
 472                 return $thumbName;
 473         }
 474
 475         /**
 476          * Create a thumbnail of the image having the specified width/height.
 477          * The thumbnail will not be created if the width is larger than the
 478          * image's width. Let the browser do the scaling in this case.
 479          * The thumbnail is stored on disk and is only computed if the thumbnail
 480          * file does not exist OR if it is older than the image.
 481          * Returns the URL.
 482          *
 483          * Keeps aspect ratio of original image. If both width and height are
 484          * specified, the generated image will be no bigger than width x height,
 485          * and will also have correct aspect ratio.
 486          *
 487          * @param integer $width        maximum width of the generated thumbnail
 488          * @param integer $height       maximum height of the image (optional)
 489          */
 490         public function createThumb( $width, $height = -1 ) {
 491                 $params = array( 'width' => $width );
 492                 if ( $height != -1 ) {
 493                         $params['height'] = $height;
 494                 }
 495                 $thumb = $this->transform( $params );
 496                 if( is_null( $thumb ) || $thumb->isError() ) return '';
 497                 return $thumb->getUrl();
 498         }
 499
 500         /**
 501          * As createThumb, but returns a ThumbnailImage object. This can
 502          * provide access to the actual file, the real size of the thumb,
 503          * and can produce a convenient <img> tag for you.
 504          *
 505          * For non-image formats, this may return a filetype-specific icon.
 506          *
 507          * @param integer $width        maximum width of the generated thumbnail
 508          * @param integer $height       maximum height of the image (optional)
 509          * @param boolean $render       True to render the thumbnail if it doesn't exist,
 510          *                              false to just return the URL
 511          *
 512          * @return ThumbnailImage or null on failure
 513          *
 514          * @deprecated use transform()
 515          */
 516         public function getThumbnail( $width, $height=-1, $render = true ) {
 517                 $params = array( 'width' => $width );
 518                 if ( $height != -1 ) {
 519                         $params['height'] = $height;
 520                 }
 521                 $flags = $render ? self::RENDER_NOW : 0;
 522                 return $this->transform( $params, $flags );
 523         }
 524
 525         /**
 526          * Transform a media file
 527          *
 528          * @param array $params An associative array of handler-specific parameters. Typical
 529          *                      keys are width, height and page.
 530          * @param integer $flags A bitfield, may contain self::RENDER_NOW to force rendering
 531          * @return MediaTransformOutput
 532          */
 533         function transform( $params, $flags = 0 ) {
 534                 global $wgUseSquid, $wgIgnoreImageErrors;
 535
 536                 wfProfileIn( __METHOD__ );
 537                 do {
 538                         if ( !$this->canRender() ) {
 539                                 // not a bitmap or renderable image, don't try.
 540                                 $thumb = $this->iconThumb();
 541                                 break;
 542                         }
 543
 544                         $script = $this->getTransformScript();
 545                         if ( $script && !($flags & self::RENDER_NOW) ) {
 546                                 // Use a script to transform on client request, if possible
 547                                 $thumb = $this->handler->getScriptedTransform( $this, $script, $params );
 548                                 if( $thumb ) {
 549                                         break;
 550                                 }
 551                         }
 552
 553                         $normalisedParams = $params;
 554                         $this->handler->normaliseParams( $this, $normalisedParams );
 555                         $thumbName = $this->thumbName( $normalisedParams );
 556                         $thumbPath = $this->getThumbPath( $thumbName );
 557                         $thumbUrl = $this->getThumbUrl( $thumbName );
 558
 559                         if ( $this->repo->canTransformVia404() && !($flags & self::RENDER_NOW ) ) {
 560                                 $thumb = $this->handler->getTransform( $this, $thumbPath, $thumbUrl, $params );
 561                                 break;
 562                         }
 563
 564                         wfDebug( __METHOD__.": Doing stat for $thumbPath\n" );
 565                         $this->migrateThumbFile( $thumbName );
 566                         if ( file_exists( $thumbPath ) ) {
 567                                 $thumb = $this->handler->getTransform( $this, $thumbPath, $thumbUrl, $params );
 568                                 break;
 569                         }
 570                         $thumb = $this->handler->doTransform( $this, $thumbPath, $thumbUrl, $params );
 571
 572                         // Ignore errors if requested
 573                         if ( !$thumb ) {
 574                                 $thumb = null;
 575                         } elseif ( $thumb->isError() ) {
 576                                 $this->lastError = $thumb->toText();
 577                                 if ( $wgIgnoreImageErrors && !($flags & self::RENDER_NOW) ) {
 578                                         $thumb = $this->handler->getTransform( $this, $thumbPath, $thumbUrl, $params );
 579                                 }
 580                         }
 581
 582                         // Purge. Useful in the event of Core -> Squid connection failure or squid
 583                         // purge collisions from elsewhere during failure. Don't keep triggering for
 584                         // "thumbs" which have the main image URL though (bug 13776)
 585                         if ( $wgUseSquid && ( !$thumb || $thumb->isError() || $thumb->getUrl() != $this->getURL()) ) {
 586                                 SquidUpdate::purge( array( $thumbUrl ) );
 587                         }
 588                 } while (false);
 589
 590                 wfProfileOut( __METHOD__ );
 591                 return $thumb;
 592         }
 593
 594         /**
 595          * Hook into transform() to allow migration of thumbnail files
 596          * STUB
 597          * Overridden by LocalFile
 598          */
 599         function migrateThumbFile( $thumbName ) {}
 600
 601         /**
 602          * Get a MediaHandler instance for this file
 603          */
 604         function getHandler() {
 605                 if ( !isset( $this->handler ) ) {
 606                         $this->handler = MediaHandler::getHandler( $this->getMimeType() );
 607                 }
 608                 return $this->handler;
 609         }
 610
 611         /**
 612          * Get a ThumbnailImage representing a file type icon
 613          * @return ThumbnailImage
 614          */
 615         function iconThumb() {
 616                 global $wgStylePath, $wgStyleDirectory;
 617
 618                 $try = array( 'fileicon-' . $this->getExtension() . '.png', 'fileicon.png' );
 619                 foreach( $try as $icon ) {
 620                         $path = '/common/images/icons/' . $icon;
 621                         $filepath = $wgStyleDirectory . $path;
 622                         if( file_exists( $filepath ) ) {
 623                                 return new ThumbnailImage( $this, $wgStylePath . $path, 120, 120 );
 624                         }
 625                 }
 626                 return null;
 627         }
 628
 629         /**
 630          * Get last thumbnailing error.
 631          * Largely obsolete.
 632          */
 633         function getLastError() {
 634                 return $this->lastError;
 635         }
 636
 637         /**
 638          * Get all thumbnail names previously generated for this file
 639          * STUB
 640          * Overridden by LocalFile
 641          */
 642         function getThumbnails() { return array(); }
 643
 644         /**
 645          * Purge shared caches such as thumbnails and DB data caching
 646          * STUB
 647          * Overridden by LocalFile
 648          */
 649         function purgeCache() {}
 650
 651         /**
 652          * Purge the file description page, but don't go after
 653          * pages using the file. Use when modifying file history
 654          * but not the current data.
 655          */
 656         function purgeDescription() {
 657                 $title = $this->getTitle();
 658                 if ( $title ) {
 659                         $title->invalidateCache();
 660                         $title->purgeSquid();
 661                 }
 662         }
 663
 664         /**
 665          * Purge metadata and all affected pages when the file is created,
 666          * deleted, or majorly updated.
 667          */
 668         function purgeEverything() {
 669                 // Delete thumbnails and refresh file metadata cache
 670                 $this->purgeCache();
 671                 $this->purgeDescription();
 672
 673                 // Purge cache of all pages using this file
 674                 $title = $this->getTitle();
 675                 if ( $title ) {
 676                         $update = new HTMLCacheUpdate( $title, 'imagelinks' );
 677                         $update->doUpdate();
 678                 }
 679         }
 680
 681         /**
 682          * Return a fragment of the history of file.
 683          *
 684          * STUB
 685          * @param $limit integer Limit of rows to return
 686          * @param $start timestamp Only revisions older than $start will be returned
 687          * @param $end timestamp Only revisions newer than $end will be returned
 688          */
 689         function getHistory($limit = null, $start = null, $end = null) {
 690                 return array();
 691         }
 692
 693         /**
 694          * Return the history of this file, line by line. Starts with current version,
 695          * then old versions. Should return an object similar to an image/oldimage
 696          * database row.
 697          *
 698          * STUB
 699          * Overridden in LocalFile
 700          */
 701         public function nextHistoryLine() {
 702                 return false;
 703         }
 704
 705         /**
 706          * Reset the history pointer to the first element of the history.
 707          * Always call this function after using nextHistoryLine() to free db resources
 708          * STUB
 709          * Overridden in LocalFile.
 710          */
 711         public function resetHistory() {}
 712
 713         /**
 714          * Get the filename hash component of the directory including trailing slash,
 715          * e.g. f/fa/
 716          * If the repository is not hashed, returns an empty string.
 717          */
 718         function getHashPath() {
 719                 if ( !isset( $this->hashPath ) ) {
 720                         $this->hashPath = $this->repo->getHashPath( $this->getName() );
 721                 }
 722                 return $this->hashPath;
 723         }
 724
 725         /**
 726          * Get the path of the file relative to the public zone root
 727          */
 728         function getRel() {
 729                 return $this->getHashPath() . $this->getName();
 730         }
 731
 732         /**
 733          * Get urlencoded relative path of the file
 734          */
 735         function getUrlRel() {
 736                 return $this->getHashPath() . rawurlencode( $this->getName() );
 737         }
 738
 739         /** Get the relative path for an archive file */
 740         function getArchiveRel( $suffix = false ) {
 741                 $path = 'archive/' . $this->getHashPath();
 742                 if ( $suffix === false ) {
 743                         $path = substr( $path, 0, -1 );
 744                 } else {
 745                         $path .= $suffix;
 746                 }
 747                 return $path;
 748         }
 749
 750         /** Get relative path for a thumbnail file */
 751         function getThumbRel( $suffix = false ) {
 752                 $path = $this->repo->thumbDir . $this->getRel();
 753                 if ( $suffix !== false ) {
 754                         $path .= '/' . $suffix;
 755                 }
 756                 return $path;
 757         }
 758
 759         /** Get the path of the archive directory, or a particular file if $suffix is specified */
 760         function getArchivePath( $suffix = false ) {
 761                 return $this->repo->getZonePath('public') . '/' . $this->getArchiveRel( $suffix );
 762         }
 763
 764         /** Get the path of the thumbnail directory, or a particular file if $suffix is specified */
 765         function getThumbPath( $suffix = false ) {
 766                 return $this->repo->getZonePath('public') . '/' . $this->getThumbRel( $suffix );
 767         }
 768
 769         /** Get the URL of the archive directory, or a particular file if $suffix is specified */
 770         function getArchiveUrl( $suffix = false ) {
 771                 $path = $this->repo->getZoneUrl('public') . '/archive/' . $this->getHashPath();
 772                 if ( $suffix === false ) {
 773                         $path = substr( $path, 0, -1 );
 774                 } else {
 775                         $path .= rawurlencode( $suffix );
 776                 }
 777                 return $path;
 778         }
 779
 780         /** Get the URL of the thumbnail directory, or a particular file if $suffix is specified */
 781         function getThumbUrl( $suffix = false ) {
 782                 $path = $this->repo->getZoneUrl('public') . '/'. $this->repo->thumbDir . $this->getUrlRel();
 783                 if ( $suffix !== false ) {
 784                         $path .= '/' . rawurlencode( $suffix );
 785                 }
 786                 return $path;
 787         }
 788
 789         /** Get the virtual URL for an archive file or directory */
 790         function getArchiveVirtualUrl( $suffix = false ) {
 791                 $path = $this->repo->getVirtualUrl() . '/public/archive/' . $this->getHashPath();
 792                 if ( $suffix === false ) {
 793                         $path = substr( $path, 0, -1 );
 794                 } else {
 795                         $path .= rawurlencode( $suffix );
 796                 }
 797                 return $path;
 798         }
 799
 800         /** Get the virtual URL for a thumbnail file or directory */
 801         function getThumbVirtualUrl( $suffix = false ) {
 802                 $path = $this->repo->getVirtualUrl() . '/public/' . $this->repo->thumbDir . $this->getUrlRel();
 803                 if ( $suffix !== false ) {
 804                         $path .= '/' . rawurlencode( $suffix );
 805                 }
 806                 return $path;
 807         }
 808
 809         /** Get the virtual URL for the file itself */
 810         function getVirtualUrl( $suffix = false ) {
 811                 $path = $this->repo->getVirtualUrl() . '/public/' . $this->getUrlRel();
 812                 if ( $suffix !== false ) {
 813                         $path .= '/' . rawurlencode( $suffix );
 814                 }
 815                 return $path;
 816         }
 817
 818         /**
 819          * @return bool
 820          */
 821         function isHashed() {
 822                 return $this->repo->isHashed();
 823         }
 824
 825         function readOnlyError() {
 826                 throw new MWException( get_class($this) . ': write operations are not supported' );
 827         }
 828
 829         /**
 830          * Record a file upload in the upload log and the image table
 831          * STUB
 832          * Overridden by LocalFile
 833          */
 834         function recordUpload( $oldver, $desc, $license = '', $copyStatus = '', $source = '', $watch = false ) {
 835                 $this->readOnlyError();
 836         }
 837
 838         /**
 839          * Move or copy a file to its public location. If a file exists at the
 840          * destination, move it to an archive. Returns the archive name on success
 841          * or an empty string if it was a new file, and a wikitext-formatted
 842          * WikiError object on failure.
 843          *
 844          * The archive name should be passed through to recordUpload for database
 845          * registration.
 846          *
 847          * @param string $sourcePath Local filesystem path to the source image
 848          * @param integer $flags A bitwise combination of:
 849          *     File::DELETE_SOURCE    Delete the source file, i.e. move
 850          *         rather than copy
 851          * @return The archive name on success or an empty string if it was a new
 852          *     file, and a wikitext-formatted WikiError object on failure.
 853          *
 854          * STUB
 855          * Overridden by LocalFile
 856          */
 857         function publish( $srcPath, $flags = 0 ) {
 858                 $this->readOnlyError();
 859         }
 860
 861         /**
 862          * Get an array of Title objects which are articles which use this file
 863          * Also adds their IDs to the link cache
 864          *
 865          * This is mostly copied from Title::getLinksTo()
 866          *
 867          * @deprecated Use HTMLCacheUpdate, this function uses too much memory
 868          */
 869         function getLinksTo( $options = '' ) {
 870                 wfProfileIn( __METHOD__ );
 871
 872                 // Note: use local DB not repo DB, we want to know local links
 873                 if ( $options ) {
 874                         $db = wfGetDB( DB_MASTER );
 875                 } else {
 876                         $db = wfGetDB( DB_SLAVE );
 877                 }
 878                 $linkCache = LinkCache::singleton();
 879
 880                 list( $page, $imagelinks ) = $db->tableNamesN( 'page', 'imagelinks' );
 881                 $encName = $db->addQuotes( $this->getName() );
 882                 $sql = "SELECT page_namespace,page_title,page_id,page_len,page_is_redirect,
 883                         FROM $page,$imagelinks WHERE page_id=il_from AND il_to=$encName $options";
 884                 $res = $db->query( $sql, __METHOD__ );
 885
 886                 $retVal = array();
 887                 if ( $db->numRows( $res ) ) {
 888                         while ( $row = $db->fetchObject( $res ) ) {
 889                                 if ( $titleObj = Title::newFromRow( $row ) ) {
 890                                         $linkCache->addGoodLinkObj( $row->page_id, $titleObj, $row->page_len, $row->page_is_redirect );
 891                                         $retVal[] = $titleObj;
 892                                 }
 893                         }
 894                 }
 895                 $db->freeResult( $res );
 896                 wfProfileOut( __METHOD__ );
 897                 return $retVal;
 898         }
 899
 900         function formatMetadata() {
 901                 if ( !$this->getHandler() ) {
 902                         return false;
 903                 }
 904                 return $this->getHandler()->formatMetadata( $this, $this->getMetadata() );
 905         }
 906
 907         /**
 908          * Returns true if the file comes from the local file repository.
 909          *
 910          * @return bool
 911          */
 912         function isLocal() {
 913                 return $this->getRepoName() == 'local';
 914         }
 915
 916         /**
 917          * Returns the name of the repository.
 918          *
 919          * @return string
 920          */
 921         function getRepoName() {
 922                 return $this->repo ? $this->repo->getName() : 'unknown';
 923         }
 924         /*
 925          * Returns the repository
 926          */
 927         function getRepo() {
 928                 return $this->repo;
 929         }
 930
 931         /**
 932          * Returns true if the image is an old version
 933          * STUB
 934          */
 935         function isOld() {
 936                 return false;
 937         }
 938
 939         /**
 940          * Is this file a "deleted" file in a private archive?
 941          * STUB
 942          */
 943         function isDeleted( $field ) {
 944                 return false;
 945         }
 946
 947         /**
 948          * Was this file ever deleted from the wiki?
 949          *
 950          * @return bool
 951          */
 952         function wasDeleted() {
 953                 $title = $this->getTitle();
 954                 return $title && $title->isDeleted() > 0;
 955         }
 956
 957         /**
 958          * Move file to the new title
 959          *
 960          * Move current, old version and all thumbnails
 961          * to the new filename. Old file is deleted.
 962          *
 963          * Cache purging is done; checks for validity
 964          * and logging are caller's responsibility
 965          *
 966          * @param $target Title New file name
 967          * @return FileRepoStatus object.
 968          */
 969          function move( $target ) {
 970                 $this->readOnlyError();
 971          }
 972
 973         /**
 974          * Delete all versions of the file.
 975          *
 976          * Moves the files into an archive directory (or deletes them)
 977          * and removes the database rows.
 978          *
 979          * Cache purging is done; logging is caller's responsibility.
 980          *
 981          * @param $reason
 982          * @param $suppress, hide content from sysops?
 983          * @return true on success, false on some kind of failure
 984          * STUB
 985          * Overridden by LocalFile
 986          */
 987         function delete( $reason, $suppress = false ) {
 988                 $this->readOnlyError();
 989         }
 990
 991         /**
 992          * Restore all or specified deleted revisions to the given file.
 993          * Permissions and logging are left to the caller.
 994          *
 995          * May throw database exceptions on error.
 996          *
 997          * @param $versions set of record ids of deleted items to restore,
 998          *                    or empty to restore all revisions.
 999          * @param $unsuppress, remove restrictions on content upon restoration?
1000          * @return the number of file revisions restored if successful,
1001          *         or false on failure
1002          * STUB
1003          * Overridden by LocalFile
1004          */
1005         function restore( $versions=array(), $unsuppress=false ) {
1006                 $this->readOnlyError();
1007         }
1008
1009         /**
1010          * Returns 'true' if this image is a multipage document, e.g. a DJVU
1011          * document.
1012          *
1013          * @return Bool
1014          */
1015         function isMultipage() {
1016                 return $this->getHandler() && $this->handler->isMultiPage( $this );
1017         }
1018
1019         /**
1020          * Returns the number of pages of a multipage document, or NULL for
1021          * documents which aren't multipage documents
1022          */
1023         function pageCount() {
1024                 if ( !isset( $this->pageCount ) ) {
1025                         if ( $this->getHandler() && $this->handler->isMultiPage( $this ) ) {
1026                                 $this->pageCount = $this->handler->pageCount( $this );
1027                         } else {
1028                                 $this->pageCount = false;
1029                         }
1030                 }
1031                 return $this->pageCount;
1032         }
1033
1034         /**
1035          * Calculate the height of a thumbnail using the source and destination width
1036          */
1037         static function scaleHeight( $srcWidth, $srcHeight, $dstWidth ) {
1038                 // Exact integer multiply followed by division
1039                 if ( $srcWidth == 0 ) {
1040                         return 0;
1041                 } else {
1042                         return round( $srcHeight * $dstWidth / $srcWidth );
1043                 }
1044         }
1045
1046         /**
1047          * Get an image size array like that returned by getimagesize(), or false if it
1048          * can't be determined.
1049          *
1050          * @param string $fileName The filename
1051          * @return array
1052          */
1053         function getImageSize( $fileName ) {
1054                 if ( !$this->getHandler() ) {
1055                         return false;
1056                 }
1057                 return $this->handler->getImageSize( $this, $fileName );
1058         }
1059
1060         /**
1061          * Get the URL of the image description page. May return false if it is
1062          * unknown or not applicable.
1063          */
1064         function getDescriptionUrl() {
1065                 return $this->repo->getDescriptionUrl( $this->getName() );
1066         }
1067
1068         /**
1069          * Get the HTML text of the description page, if available
1070          */
1071         function getDescriptionText() {
1072                 global $wgMemc;
1073                 if ( !$this->repo->fetchDescription ) {
1074                         return false;
1075                 }
1076                 $renderUrl = $this->repo->getDescriptionRenderUrl( $this->getName() );
1077                 if ( $renderUrl ) {
1078                         if ( $this->repo->descriptionCacheExpiry > 0 ) {
1079                                 wfDebug("Attempting to get the description from cache...");
1080                                 $key = wfMemcKey( 'RemoteFileDescription', 'url', md5($renderUrl) );
1081                                 $obj = $wgMemc->get($key);
1082                                 if ($obj) {
1083                                         wfDebug("success!\n");
1084                                         return $obj;
1085                                 }
1086                                 wfDebug("miss\n");
1087                         }
1088                         wfDebug( "Fetching shared description from $renderUrl\n" );
1089                         $res = Http::get( $renderUrl );
1090                         if ( $res && $this->repo->descriptionCacheExpiry > 0 ) $wgMemc->set( $key, $res, $this->repo->descriptionCacheExpiry );
1091                         return $res;
1092                 } else {
1093                         return false;
1094                 }
1095         }
1096
1097         /**
1098          * Get discription of file revision
1099          * STUB
1100          */
1101         function getDescription() {
1102                 return null;
1103         }
1104
1105         /**
1106          * Get the 14-character timestamp of the file upload, or false if
1107          * it doesn't exist
1108          */
1109         function getTimestamp() {
1110                 $path = $this->getPath();
1111                 if ( !file_exists( $path ) ) {
1112                         return false;
1113                 }
1114                 return wfTimestamp( TS_MW, filemtime( $path ) );
1115         }
1116
1117         /**
1118          * Get the SHA-1 base 36 hash of the file
1119          */
1120         function getSha1() {
1121                 return self::sha1Base36( $this->getPath() );
1122         }
1123
1124         /**
1125          * Determine if the current user is allowed to view a particular
1126          * field of this file, if it's marked as deleted.
1127          * STUB
1128          * @param int $field
1129          * @return bool
1130          */
1131         function userCan( $field ) {
1132                 return true;
1133         }
1134
1135         /**
1136          * Get an associative array containing information about a file in the local filesystem.
1137          *
1138          * @param string $path Absolute local filesystem path
1139          * @param mixed $ext The file extension, or true to extract it from the filename.
1140          *                   Set it to false to ignore the extension.
1141          */
1142         static function getPropsFromPath( $path, $ext = true ) {
1143                 wfProfileIn( __METHOD__ );
1144                 wfDebug( __METHOD__.": Getting file info for $path\n" );
1145                 $info = array(
1146                         'fileExists' => file_exists( $path ) && !is_dir( $path )
1147                 );
1148                 $gis = false;
1149                 if ( $info['fileExists'] ) {
1150                         $magic = MimeMagic::singleton();
1151
1152                         $info['mime'] = $magic->guessMimeType( $path, $ext );
1153                         list( $info['major_mime'], $info['minor_mime'] ) = self::splitMime( $info['mime'] );
1154                         $info['media_type'] = $magic->getMediaType( $path, $info['mime'] );
1155
1156                         # Get size in bytes
1157                         $info['size'] = filesize( $path );
1158
1159                         # Height, width and metadata
1160                         $handler = MediaHandler::getHandler( $info['mime'] );
1161                         if ( $handler ) {
1162                                 $tempImage = (object)array();
1163                                 $info['metadata'] = $handler->getMetadata( $tempImage, $path );
1164                                 $gis = $handler->getImageSize( $tempImage, $path, $info['metadata'] );
1165                         } else {
1166                                 $gis = false;
1167                                 $info['metadata'] = '';
1168                         }
1169                         $info['sha1'] = self::sha1Base36( $path );
1170
1171                         wfDebug(__METHOD__.": $path loaded, {$info['size']} bytes, {$info['mime']}.\n");
1172                 } else {
1173                         $info['mime'] = NULL;
1174                         $info['media_type'] = MEDIATYPE_UNKNOWN;
1175                         $info['metadata'] = '';
1176                         $info['sha1'] = '';
1177                         wfDebug(__METHOD__.": $path NOT FOUND!\n");
1178                 }
1179                 if( $gis ) {
1180                         # NOTE: $gis[2] contains a code for the image type. This is no longer used.
1181                         $info['width'] = $gis[0];
1182                         $info['height'] = $gis[1];
1183                         if ( isset( $gis['bits'] ) ) {
1184                                 $info['bits'] = $gis['bits'];
1185                         } else {
1186                                 $info['bits'] = 0;
1187                         }
1188                 } else {
1189                         $info['width'] = 0;
1190                         $info['height'] = 0;
1191                         $info['bits'] = 0;
1192                 }
1193                 wfProfileOut( __METHOD__ );
1194                 return $info;
1195         }
1196
1197         /**
1198          * Get a SHA-1 hash of a file in the local filesystem, in base-36 lower case
1199          * encoding, zero padded to 31 digits.
1200          *
1201          * 160 log 2 / log 36 = 30.95, so the 160-bit hash fills 31 digits in base 36
1202          * fairly neatly.
1203          *
1204          * Returns false on failure
1205          */
1206         static function sha1Base36( $path ) {
1207                 wfSuppressWarnings();
1208                 $hash = sha1_file( $path );
1209                 wfRestoreWarnings();
1210                 if ( $hash === false ) {
1211                         return false;
1212                 } else {
1213                         return wfBaseConvert( $hash, 16, 36, 31 );
1214                 }
1215         }
1216
1217         function getLongDesc() {
1218                 $handler = $this->getHandler();
1219                 if ( $handler ) {
1220                         return $handler->getLongDesc( $this );
1221                 } else {
1222                         return MediaHandler::getLongDesc( $this );
1223                 }
1224         }
1225
1226         function getShortDesc() {
1227                 $handler = $this->getHandler();
1228                 if ( $handler ) {
1229                         return $handler->getShortDesc( $this );
1230                 } else {
1231                         return MediaHandler::getShortDesc( $this );
1232                 }
1233         }
1234
1235         function getDimensionsString() {
1236                 $handler = $this->getHandler();
1237                 if ( $handler ) {
1238                         return $handler->getDimensionsString( $this );
1239                 } else {
1240                         return '';
1241                 }
1242         }
1243
1244         function getRedirected() {
1245                 return $this->redirected;
1246         }
1247
1248         function getRedirectedTitle() {
1249                 if ( $this->redirected ) {
1250                         if ( !$this->redirectTitle )
1251                                 $this->redirectTitle = Title::makeTitle( NS_IMAGE, $this->redirected );
1252                         return $this->redirectTitle;
1253                 }
1254         }
1255
1256         function redirectedFrom( $from ) {
1257                 $this->redirected = $from;
1258         }
1259 }
1260 /**
1261  * Aliases for backwards compatibility with 1.6
1262  */
1263 define( 'MW_IMG_DELETED_FILE', File::DELETED_FILE );
1264 define( 'MW_IMG_DELETED_COMMENT', File::DELETED_COMMENT );
1265 define( 'MW_IMG_DELETED_USER', File::DELETED_USER );
1266 define( 'MW_IMG_DELETED_RESTRICTED', File::DELETED_RESTRICTED );