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       Deprecated
 510          *
 511          * @return ThumbnailImage or null on failure
 512          *
 513          * @deprecated use transform()
 514          */
 515         public function getThumbnail( $width, $height=-1, $render = true ) {
 516                 $params = array( 'width' => $width );
 517                 if ( $height != -1 ) {
 518                         $params['height'] = $height;
 519                 }
 520                 return $this->transform( $params, 0 );
 521         }
 522
 523         /**
 524          * Transform a media file
 525          *
 526          * @param array $params An associative array of handler-specific parameters. Typical
 527          *                      keys are width, height and page.
 528          * @param integer $flags A bitfield, may contain self::RENDER_NOW to force rendering
 529          * @return MediaTransformOutput
 530          */
 531         function transform( $params, $flags = 0 ) {
 532                 global $wgUseSquid, $wgIgnoreImageErrors;
 533
 534                 wfProfileIn( __METHOD__ );
 535                 do {
 536                         if ( !$this->canRender() ) {
 537                                 // not a bitmap or renderable image, don't try.
 538                                 $thumb = $this->iconThumb();
 539                                 break;
 540                         }
 541
 542                         $script = $this->getTransformScript();
 543                         if ( $script && !($flags & self::RENDER_NOW) ) {
 544                                 // Use a script to transform on client request, if possible
 545                                 $thumb = $this->handler->getScriptedTransform( $this, $script, $params );
 546                                 if( $thumb ) {
 547                                         break;
 548                                 }
 549                         }
 550
 551                         $normalisedParams = $params;
 552                         $this->handler->normaliseParams( $this, $normalisedParams );
 553                         $thumbName = $this->thumbName( $normalisedParams );
 554                         $thumbPath = $this->getThumbPath( $thumbName );
 555                         $thumbUrl = $this->getThumbUrl( $thumbName );
 556
 557                         if ( $this->repo->canTransformVia404() && !($flags & self::RENDER_NOW ) ) {
 558                                 $thumb = $this->handler->getTransform( $this, $thumbPath, $thumbUrl, $params );
 559                                 break;
 560                         }
 561
 562                         wfDebug( __METHOD__.": Doing stat for $thumbPath\n" );
 563                         $this->migrateThumbFile( $thumbName );
 564                         if ( file_exists( $thumbPath ) ) {
 565                                 $thumb = $this->handler->getTransform( $this, $thumbPath, $thumbUrl, $params );
 566                                 break;
 567                         }
 568                         $thumb = $this->handler->doTransform( $this, $thumbPath, $thumbUrl, $params );
 569
 570                         // Ignore errors if requested
 571                         if ( !$thumb ) {
 572                                 $thumb = null;
 573                         } elseif ( $thumb->isError() ) {
 574                                 $this->lastError = $thumb->toText();
 575                                 if ( $wgIgnoreImageErrors && !($flags & self::RENDER_NOW) ) {
 576                                         $thumb = $this->handler->getTransform( $this, $thumbPath, $thumbUrl, $params );
 577                                 }
 578                         }
 579
 580                         // Purge. Useful in the event of Core -> Squid connection failure or squid
 581                         // purge collisions from elsewhere during failure. Don't keep triggering for
 582                         // "thumbs" which have the main image URL though (bug 13776)
 583                         if ( $wgUseSquid && ( !$thumb || $thumb->isError() || $thumb->getUrl() != $this->getURL()) ) {
 584                                 SquidUpdate::purge( array( $thumbUrl ) );
 585                         }
 586                 } while (false);
 587
 588                 wfProfileOut( __METHOD__ );
 589                 return is_object( $thumb ) ? $thumb : false;
 590         }
 591
 592         /**
 593          * Hook into transform() to allow migration of thumbnail files
 594          * STUB
 595          * Overridden by LocalFile
 596          */
 597         function migrateThumbFile( $thumbName ) {}
 598
 599         /**
 600          * Get a MediaHandler instance for this file
 601          */
 602         function getHandler() {
 603                 if ( !isset( $this->handler ) ) {
 604                         $this->handler = MediaHandler::getHandler( $this->getMimeType() );
 605                 }
 606                 return $this->handler;
 607         }
 608
 609         /**
 610          * Get a ThumbnailImage representing a file type icon
 611          * @return ThumbnailImage
 612          */
 613         function iconThumb() {
 614                 global $wgStylePath, $wgStyleDirectory;
 615
 616                 $try = array( 'fileicon-' . $this->getExtension() . '.png', 'fileicon.png' );
 617                 foreach( $try as $icon ) {
 618                         $path = '/common/images/icons/' . $icon;
 619                         $filepath = $wgStyleDirectory . $path;
 620                         if( file_exists( $filepath ) ) {
 621                                 return new ThumbnailImage( $this, $wgStylePath . $path, 120, 120 );
 622                         }
 623                 }
 624                 return null;
 625         }
 626
 627         /**
 628          * Get last thumbnailing error.
 629          * Largely obsolete.
 630          */
 631         function getLastError() {
 632                 return $this->lastError;
 633         }
 634
 635         /**
 636          * Get all thumbnail names previously generated for this file
 637          * STUB
 638          * Overridden by LocalFile
 639          */
 640         function getThumbnails() { return array(); }
 641
 642         /**
 643          * Purge shared caches such as thumbnails and DB data caching
 644          * STUB
 645          * Overridden by LocalFile
 646          */
 647         function purgeCache() {}
 648
 649         /**
 650          * Purge the file description page, but don't go after
 651          * pages using the file. Use when modifying file history
 652          * but not the current data.
 653          */
 654         function purgeDescription() {
 655                 $title = $this->getTitle();
 656                 if ( $title ) {
 657                         $title->invalidateCache();
 658                         $title->purgeSquid();
 659                 }
 660         }
 661
 662         /**
 663          * Purge metadata and all affected pages when the file is created,
 664          * deleted, or majorly updated.
 665          */
 666         function purgeEverything() {
 667                 // Delete thumbnails and refresh file metadata cache
 668                 $this->purgeCache();
 669                 $this->purgeDescription();
 670
 671                 // Purge cache of all pages using this file
 672                 $title = $this->getTitle();
 673                 if ( $title ) {
 674                         $update = new HTMLCacheUpdate( $title, 'imagelinks' );
 675                         $update->doUpdate();
 676                 }
 677         }
 678
 679         /**
 680          * Return a fragment of the history of file.
 681          *
 682          * STUB
 683          * @param $limit integer Limit of rows to return
 684          * @param $start timestamp Only revisions older than $start will be returned
 685          * @param $end timestamp Only revisions newer than $end will be returned
 686          * @param $inc bool Include the endpoints of the time range
 687          */
 688         function getHistory($limit = null, $start = null, $end = null, $inc=true) {
 689                 return array();
 690         }
 691
 692         /**
 693          * Return the history of this file, line by line. Starts with current version,
 694          * then old versions. Should return an object similar to an image/oldimage
 695          * database row.
 696          *
 697          * STUB
 698          * Overridden in LocalFile
 699          */
 700         public function nextHistoryLine() {
 701                 return false;
 702         }
 703
 704         /**
 705          * Reset the history pointer to the first element of the history.
 706          * Always call this function after using nextHistoryLine() to free db resources
 707          * STUB
 708          * Overridden in LocalFile.
 709          */
 710         public function resetHistory() {}
 711
 712         /**
 713          * Get the filename hash component of the directory including trailing slash,
 714          * e.g. f/fa/
 715          * If the repository is not hashed, returns an empty string.
 716          */
 717         function getHashPath() {
 718                 if ( !isset( $this->hashPath ) ) {
 719                         $this->hashPath = $this->repo->getHashPath( $this->getName() );
 720                 }
 721                 return $this->hashPath;
 722         }
 723
 724         /**
 725          * Get the path of the file relative to the public zone root
 726          */
 727         function getRel() {
 728                 return $this->getHashPath() . $this->getName();
 729         }
 730
 731         /**
 732          * Get urlencoded relative path of the file
 733          */
 734         function getUrlRel() {
 735                 return $this->getHashPath() . rawurlencode( $this->getName() );
 736         }
 737
 738         /** Get the relative path for an archive file */
 739         function getArchiveRel( $suffix = false ) {
 740                 $path = 'archive/' . $this->getHashPath();
 741                 if ( $suffix === false ) {
 742                         $path = substr( $path, 0, -1 );
 743                 } else {
 744                         $path .= $suffix;
 745                 }
 746                 return $path;
 747         }
 748
 749         /** Get relative path for a thumbnail file */
 750         function getThumbRel( $suffix = false ) {
 751                 $path = 'thumb/' . $this->getRel();
 752                 if ( $suffix !== false ) {
 753                         $path .= '/' . $suffix;
 754                 }
 755                 return $path;
 756         }
 757
 758         /** Get the path of the archive directory, or a particular file if $suffix is specified */
 759         function getArchivePath( $suffix = false ) {
 760                 return $this->repo->getZonePath('public') . '/' . $this->getArchiveRel( $suffix );
 761         }
 762
 763         /** Get the path of the thumbnail directory, or a particular file if $suffix is specified */
 764         function getThumbPath( $suffix = false ) {
 765                 return $this->repo->getZonePath('public') . '/' . $this->getThumbRel( $suffix );
 766         }
 767
 768         /** Get the URL of the archive directory, or a particular file if $suffix is specified */
 769         function getArchiveUrl( $suffix = false ) {
 770                 $path = $this->repo->getZoneUrl('public') . '/archive/' . $this->getHashPath();
 771                 if ( $suffix === false ) {
 772                         $path = substr( $path, 0, -1 );
 773                 } else {
 774                         $path .= rawurlencode( $suffix );
 775                 }
 776                 return $path;
 777         }
 778
 779         /** Get the URL of the thumbnail directory, or a particular file if $suffix is specified */
 780         function getThumbUrl( $suffix = false ) {
 781                 $path = $this->repo->getZoneUrl('public') . '/thumb/' . $this->getUrlRel();
 782                 if ( $suffix !== false ) {
 783                         $path .= '/' . rawurlencode( $suffix );
 784                 }
 785                 return $path;
 786         }
 787
 788         /** Get the virtual URL for an archive file or directory */
 789         function getArchiveVirtualUrl( $suffix = false ) {
 790                 $path = $this->repo->getVirtualUrl() . '/public/archive/' . $this->getHashPath();
 791                 if ( $suffix === false ) {
 792                         $path = substr( $path, 0, -1 );
 793                 } else {
 794                         $path .= rawurlencode( $suffix );
 795                 }
 796                 return $path;
 797         }
 798
 799         /** Get the virtual URL for a thumbnail file or directory */
 800         function getThumbVirtualUrl( $suffix = false ) {
 801                 $path = $this->repo->getVirtualUrl() . '/public/thumb/' . $this->getUrlRel();
 802                 if ( $suffix !== false ) {
 803                         $path .= '/' . rawurlencode( $suffix );
 804                 }
 805                 return $path;
 806         }
 807
 808         /** Get the virtual URL for the file itself */
 809         function getVirtualUrl( $suffix = false ) {
 810                 $path = $this->repo->getVirtualUrl() . '/public/' . $this->getUrlRel();
 811                 if ( $suffix !== false ) {
 812                         $path .= '/' . rawurlencode( $suffix );
 813                 }
 814                 return $path;
 815         }
 816
 817         /**
 818          * @return bool
 819          */
 820         function isHashed() {
 821                 return $this->repo->isHashed();
 822         }
 823
 824         function readOnlyError() {
 825                 throw new MWException( get_class($this) . ': write operations are not supported' );
 826         }
 827
 828         /**
 829          * Record a file upload in the upload log and the image table
 830          * STUB
 831          * Overridden by LocalFile
 832          */
 833         function recordUpload( $oldver, $desc, $license = '', $copyStatus = '', $source = '', $watch = false ) {
 834                 $this->readOnlyError();
 835         }
 836
 837         /**
 838          * Move or copy a file to its public location. If a file exists at the
 839          * destination, move it to an archive. Returns the archive name on success
 840          * or an empty string if it was a new file, and a wikitext-formatted
 841          * WikiError object on failure.
 842          *
 843          * The archive name should be passed through to recordUpload for database
 844          * registration.
 845          *
 846          * @param string $sourcePath Local filesystem path to the source image
 847          * @param integer $flags A bitwise combination of:
 848          *     File::DELETE_SOURCE    Delete the source file, i.e. move
 849          *         rather than copy
 850          * @return The archive name on success or an empty string if it was a new
 851          *     file, and a wikitext-formatted WikiError object on failure.
 852          *
 853          * STUB
 854          * Overridden by LocalFile
 855          */
 856         function publish( $srcPath, $flags = 0 ) {
 857                 $this->readOnlyError();
 858         }
 859
 860         /**
 861          * Get an array of Title objects which are articles which use this file
 862          * Also adds their IDs to the link cache
 863          *
 864          * This is mostly copied from Title::getLinksTo()
 865          *
 866          * @deprecated Use HTMLCacheUpdate, this function uses too much memory
 867          */
 868         function getLinksTo( $options = array() ) {
 869                 wfProfileIn( __METHOD__ );
 870
 871                 // Note: use local DB not repo DB, we want to know local links
 872                 if ( count( $options ) > 0 ) {
 873                         $db = wfGetDB( DB_MASTER );
 874                 } else {
 875                         $db = wfGetDB( DB_SLAVE );
 876                 }
 877                 $linkCache = LinkCache::singleton();
 878
 879                 $encName = $db->addQuotes( $this->getName() );
 880                 $res = $db->select( array( 'page', 'imagelinks'),
 881                                                         array( 'page_namespace', 'page_title', 'page_id', 'page_len', 'page_is_redirect' ),
 882                                                         array( 'page_id' => 'il_from', 'il_to' => $encName ),
 883                                                         __METHOD__,
 884                                                         $options );
 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, $wgContLang;
1073                 if ( !$this->repo->fetchDescription ) {
1074                         return false;
1075                 }
1076                 $renderUrl = $this->repo->getDescriptionRenderUrl( $this->getName(), $wgContLang->getCode() );
1077                 if ( $renderUrl ) {
1078                         if ( $this->repo->descriptionCacheExpiry > 0 ) {
1079                                 wfDebug("Attempting to get the description from cache...");
1080                                 $key = wfMemcKey( 'RemoteFileDescription', 'url', $wgContLang->getCode(),
1081                                                                         $this->getName() );
1082                                 $obj = $wgMemc->get($key);
1083                                 if ($obj) {
1084                                         wfDebug("success!\n");
1085                                         return $obj;
1086                                 }
1087                                 wfDebug("miss\n");
1088                         }
1089                         wfDebug( "Fetching shared description from $renderUrl\n" );
1090                         $res = Http::get( $renderUrl );
1091                         if ( $res && $this->repo->descriptionCacheExpiry > 0 ) {
1092                                 $wgMemc->set( $key, $res, $this->repo->descriptionCacheExpiry );
1093                         }
1094                         return $res;
1095                 } else {
1096                         return false;
1097                 }
1098         }
1099
1100         /**
1101          * Get discription of file revision
1102          * STUB
1103          */
1104         function getDescription() {
1105                 return null;
1106         }
1107
1108         /**
1109          * Get the 14-character timestamp of the file upload, or false if
1110          * it doesn't exist
1111          */
1112         function getTimestamp() {
1113                 $path = $this->getPath();
1114                 if ( !file_exists( $path ) ) {
1115                         return false;
1116                 }
1117                 return wfTimestamp( TS_MW, filemtime( $path ) );
1118         }
1119
1120         /**
1121          * Get the SHA-1 base 36 hash of the file
1122          */
1123         function getSha1() {
1124                 return self::sha1Base36( $this->getPath() );
1125         }
1126
1127         /**
1128          * Determine if the current user is allowed to view a particular
1129          * field of this file, if it's marked as deleted.
1130          * STUB
1131          * @param int $field
1132          * @return bool
1133          */
1134         function userCan( $field ) {
1135                 return true;
1136         }
1137
1138         /**
1139          * Get an associative array containing information about a file in the local filesystem.
1140          *
1141          * @param string $path Absolute local filesystem path
1142          * @param mixed $ext The file extension, or true to extract it from the filename.
1143          *                   Set it to false to ignore the extension.
1144          */
1145         static function getPropsFromPath( $path, $ext = true ) {
1146                 wfProfileIn( __METHOD__ );
1147                 wfDebug( __METHOD__.": Getting file info for $path\n" );
1148                 $info = array(
1149                         'fileExists' => file_exists( $path ) && !is_dir( $path )
1150                 );
1151                 $gis = false;
1152                 if ( $info['fileExists'] ) {
1153                         $magic = MimeMagic::singleton();
1154
1155                         $info['mime'] = $magic->guessMimeType( $path, $ext );
1156                         list( $info['major_mime'], $info['minor_mime'] ) = self::splitMime( $info['mime'] );
1157                         $info['media_type'] = $magic->getMediaType( $path, $info['mime'] );
1158
1159                         # Get size in bytes
1160                         $info['size'] = filesize( $path );
1161
1162                         # Height, width and metadata
1163                         $handler = MediaHandler::getHandler( $info['mime'] );
1164                         if ( $handler ) {
1165                                 $tempImage = (object)array();
1166                                 $info['metadata'] = $handler->getMetadata( $tempImage, $path );
1167                                 $gis = $handler->getImageSize( $tempImage, $path, $info['metadata'] );
1168                         } else {
1169                                 $gis = false;
1170                                 $info['metadata'] = '';
1171                         }
1172                         $info['sha1'] = self::sha1Base36( $path );
1173
1174                         wfDebug(__METHOD__.": $path loaded, {$info['size']} bytes, {$info['mime']}.\n");
1175                 } else {
1176                         $info['mime'] = NULL;
1177                         $info['media_type'] = MEDIATYPE_UNKNOWN;
1178                         $info['metadata'] = '';
1179                         $info['sha1'] = '';
1180                         wfDebug(__METHOD__.": $path NOT FOUND!\n");
1181                 }
1182                 if( $gis ) {
1183                         # NOTE: $gis[2] contains a code for the image type. This is no longer used.
1184                         $info['width'] = $gis[0];
1185                         $info['height'] = $gis[1];
1186                         if ( isset( $gis['bits'] ) ) {
1187                                 $info['bits'] = $gis['bits'];
1188                         } else {
1189                                 $info['bits'] = 0;
1190                         }
1191                 } else {
1192                         $info['width'] = 0;
1193                         $info['height'] = 0;
1194                         $info['bits'] = 0;
1195                 }
1196                 wfProfileOut( __METHOD__ );
1197                 return $info;
1198         }
1199
1200         /**
1201          * Get a SHA-1 hash of a file in the local filesystem, in base-36 lower case
1202          * encoding, zero padded to 31 digits.
1203          *
1204          * 160 log 2 / log 36 = 30.95, so the 160-bit hash fills 31 digits in base 36
1205          * fairly neatly.
1206          *
1207          * Returns false on failure
1208          */
1209         static function sha1Base36( $path ) {
1210                 wfSuppressWarnings();
1211                 $hash = sha1_file( $path );
1212                 wfRestoreWarnings();
1213                 if ( $hash === false ) {
1214                         return false;
1215                 } else {
1216                         return wfBaseConvert( $hash, 16, 36, 31 );
1217                 }
1218         }
1219
1220         function getLongDesc() {
1221                 $handler = $this->getHandler();
1222                 if ( $handler ) {
1223                         return $handler->getLongDesc( $this );
1224                 } else {
1225                         return MediaHandler::getGeneralLongDesc( $this );
1226                 }
1227         }
1228
1229         function getShortDesc() {
1230                 $handler = $this->getHandler();
1231                 if ( $handler ) {
1232                         return $handler->getShortDesc( $this );
1233                 } else {
1234                         return MediaHandler::getGeneralShortDesc( $this );
1235                 }
1236         }
1237
1238         function getDimensionsString() {
1239                 $handler = $this->getHandler();
1240                 if ( $handler ) {
1241                         return $handler->getDimensionsString( $this );
1242                 } else {
1243                         return '';
1244                 }
1245         }
1246
1247         function getRedirected() {
1248                 return $this->redirected;
1249         }
1250
1251         function getRedirectedTitle() {
1252                 if ( $this->redirected ) {
1253                         if ( !$this->redirectTitle )
1254                                 $this->redirectTitle = Title::makeTitle( NS_FILE, $this->redirected );
1255                         return $this->redirectTitle;
1256                 }
1257         }
1258
1259         function redirectedFrom( $from ) {
1260                 $this->redirected = $from;
1261         }
1262 }
1263 /**
1264  * Aliases for backwards compatibility with 1.6
1265  */
1266 define( 'MW_IMG_DELETED_FILE', File::DELETED_FILE );
1267 define( 'MW_IMG_DELETED_COMMENT', File::DELETED_COMMENT );
1268 define( 'MW_IMG_DELETED_USER', File::DELETED_USER );
1269 define( 'MW_IMG_DELETED_RESTRICTED', File::DELETED_RESTRICTED );