includes/filerepo/file/File.php

   1 <?php
   2 /**
   3  * @defgroup FileAbstraction File abstraction
   4  * @ingroup FileRepo
   5  *
   6  * Represents files in a repository.
   7  */
   8
   9 /**
  10  * Base code for files.
  11  *
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License as published by
  14  * the Free Software Foundation; either version 2 of the License, or
  15  * (at your option) any later version.
  16  *
  17  * This program is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  20  * GNU General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License along
  23  * with this program; if not, write to the Free Software Foundation, Inc.,
  24  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  25  * http://www.gnu.org/copyleft/gpl.html
  26  *
  27  * @file
  28  * @ingroup FileAbstraction
  29  */
  30
  31 /**
  32  * Implements some public methods and some protected utility functions which
  33  * are required by multiple child classes. Contains stub functionality for
  34  * unimplemented public methods.
  35  *
  36  * Stub functions which should be overridden are marked with STUB. Some more
  37  * concrete functions are also typically overridden by child classes.
  38  *
  39  * Note that only the repo object knows what its file class is called. You should
  40  * never name a file class explictly outside of the repo class. Instead use the
  41  * repo's factory functions to generate file objects, for example:
  42  *
  43  * RepoGroup::singleton()->getLocalRepo()->newFile( $title );
  44  *
  45  * The convenience functions wfLocalFile() and wfFindFile() should be sufficient
  46  * in most cases.
  47  *
  48  * @ingroup FileAbstraction
  49  */
  50 abstract class File {
  51         // Bitfield values akin to the Revision deletion constants
  52         const DELETED_FILE = 1;
  53         const DELETED_COMMENT = 2;
  54         const DELETED_USER = 4;
  55         const DELETED_RESTRICTED = 8;
  56
  57         /** Force rendering in the current process */
  58         const RENDER_NOW = 1;
  59         /**
  60          * Force rendering even if thumbnail already exist and using RENDER_NOW
  61          * I.e. you have to pass both flags: File::RENDER_NOW | File::RENDER_FORCE
  62          */
  63         const RENDER_FORCE = 2;
  64
  65         const DELETE_SOURCE = 1;
  66
  67         // Audience options for File::getDescription()
  68         const FOR_PUBLIC = 1;
  69         const FOR_THIS_USER = 2;
  70         const RAW = 3;
  71
  72         // Options for File::thumbName()
  73         const THUMB_FULL_NAME = 1;
  74
  75         /**
  76          * Some member variables can be lazy-initialised using __get(). The
  77          * initialisation function for these variables is always a function named
  78          * like getVar(), where Var is the variable name with upper-case first
  79          * letter.
  80          *
  81          * The following variables are initialised in this way in this base class:
  82          *    name, extension, handler, path, canRender, isSafeFile,
  83          *    transformScript, hashPath, pageCount, url
  84          *
  85          * Code within this class should generally use the accessor function
  86          * directly, since __get() isn't re-entrant and therefore causes bugs that
  87          * depend on initialisation order.
  88          */
  89
  90         /**
  91          * The following member variables are not lazy-initialised
  92          */
  93
  94         /** @var FileRepo|LocalRepo|ForeignAPIRepo|bool */
  95         public $repo;
  96
  97         /** @var Title|string|bool */
  98         protected $title;
  99
 100         /** @var string Text of last error */
 101         protected $lastError;
 102
 103         /** @var string Main part of the title, with underscores (Title::getDBkey) */
 104         protected $redirected;
 105
 106         /** @var Title */
 107         protected $redirectedTitle;
 108
 109         /** @var FSFile|bool False if undefined */
 110         protected $fsFile;
 111
 112         /** @var MediaHandler */
 113         protected $handler;
 114
 115         /** @var string The URL corresponding to one of the four basic zones */
 116         protected $url;
 117
 118         /** @var string File extension */
 119         protected $extension;
 120
 121         /** @var string The name of a file from its title object */
 122         protected $name;
 123
 124         /** @var string The storage path corresponding to one of the zones */
 125         protected $path;
 126
 127         /** @var string Relative path including trailing slash */
 128         protected $hashPath;
 129
 130         /** @var string number of pages of a multipage document, or false for
 131          *    documents which aren't multipage documents
 132          */
 133         protected $pageCount;
 134
 135         /** @var string URL of transformscript (for example thumb.php) */
 136         protected $transformScript;
 137
 138         /** @var Title */
 139         protected $redirectTitle;
 140
 141         /** @var bool Wether the output of transform() for this file is likely to be valid. */
 142         protected $canRender;
 143
 144         /** @var bool Wether this media file is in a format that is unlikely to
 145          *    contain viruses or malicious content
 146          */
 147         protected $isSafeFile;
 148
 149         /** @var string Required Repository class type */
 150         protected $repoClass = 'FileRepo';
 151
 152         /**
 153          * Call this constructor from child classes.
 154          *
 155          * Both $title and $repo are optional, though some functions
 156          * may return false or throw exceptions if they are not set.
 157          * Most subclasses will want to call assertRepoDefined() here.
 158          *
 159          * @param Title|string|bool $title
 160          * @param FileRepo|bool $repo
 161          */
 162         function __construct( $title, $repo ) {
 163                 if ( $title !== false ) { // subclasses may not use MW titles
 164                         $title = self::normalizeTitle( $title, 'exception' );
 165                 }
 166                 $this->title = $title;
 167                 $this->repo = $repo;
 168         }
 169
 170         /**
 171          * Given a string or Title object return either a
 172          * valid Title object with namespace NS_FILE or null
 173          *
 174          * @param Title|string $title
 175          * @param string|bool $exception Use 'exception' to throw an error on bad titles
 176          * @throws MWException
 177          * @return Title|null
 178          */
 179         static function normalizeTitle( $title, $exception = false ) {
 180                 $ret = $title;
 181                 if ( $ret instanceof Title ) {
 182                         # Normalize NS_MEDIA -> NS_FILE
 183                         if ( $ret->getNamespace() == NS_MEDIA ) {
 184                                 $ret = Title::makeTitleSafe( NS_FILE, $ret->getDBkey() );
 185                         # Sanity check the title namespace
 186                         } elseif ( $ret->getNamespace() !== NS_FILE ) {
 187                                 $ret = null;
 188                         }
 189                 } else {
 190                         # Convert strings to Title objects
 191                         $ret = Title::makeTitleSafe( NS_FILE, (string)$ret );
 192                 }
 193                 if ( !$ret && $exception !== false ) {
 194                         throw new MWException( "`$title` is not a valid file title." );
 195                 }
 196
 197                 return $ret;
 198         }
 199
 200         function __get( $name ) {
 201                 $function = array( $this, 'get' . ucfirst( $name ) );
 202                 if ( !is_callable( $function ) ) {
 203                         return null;
 204                 } else {
 205                         $this->$name = call_user_func( $function );
 206
 207                         return $this->$name;
 208                 }
 209         }
 210
 211         /**
 212          * Normalize a file extension to the common form, and ensure it's clean.
 213          * Extensions with non-alphanumeric characters will be discarded.
 214          *
 215          * @param string $ext (without the .)
 216          * @return string
 217          */
 218         static function normalizeExtension( $ext ) {
 219                 $lower = strtolower( $ext );
 220                 $squish = array(
 221                         'htm' => 'html',
 222                         'jpeg' => 'jpg',
 223                         'mpeg' => 'mpg',
 224                         'tiff' => 'tif',
 225                         'ogv' => 'ogg' );
 226                 if ( isset( $squish[$lower] ) ) {
 227                         return $squish[$lower];
 228                 } elseif ( preg_match( '/^[0-9a-z]+$/', $lower ) ) {
 229                         return $lower;
 230                 } else {
 231                         return '';
 232                 }
 233         }
 234
 235         /**
 236          * Checks if file extensions are compatible
 237          *
 238          * @param File $old Old file
 239          * @param string $new New name
 240          *
 241          * @return bool|null
 242          */
 243         static function checkExtensionCompatibility( File $old, $new ) {
 244                 $oldMime = $old->getMimeType();
 245                 $n = strrpos( $new, '.' );
 246                 $newExt = self::normalizeExtension( $n ? substr( $new, $n + 1 ) : '' );
 247                 $mimeMagic = MimeMagic::singleton();
 248
 249                 return $mimeMagic->isMatchingExtension( $newExt, $oldMime );
 250         }
 251
 252         /**
 253          * Upgrade the database row if there is one
 254          * Called by ImagePage
 255          * STUB
 256          */
 257         function upgradeRow() {
 258         }
 259
 260         /**
 261          * Split an internet media type into its two components; if not
 262          * a two-part name, set the minor type to 'unknown'.
 263          *
 264          * @param string $mime "text/html" etc
 265          * @return array ("text", "html") etc
 266          */
 267         public static function splitMime( $mime ) {
 268                 if ( strpos( $mime, '/' ) !== false ) {
 269                         return explode( '/', $mime, 2 );
 270                 } else {
 271                         return array( $mime, 'unknown' );
 272                 }
 273         }
 274
 275         /**
 276          * Callback for usort() to do file sorts by name
 277          *
 278          * @param File $a
 279          * @param File $b
 280          * @return int Result of name comparison
 281          */
 282         public static function compare( File $a, File $b ) {
 283                 return strcmp( $a->getName(), $b->getName() );
 284         }
 285
 286         /**
 287          * Return the name of this file
 288          *
 289          * @return string
 290          */
 291         public function getName() {
 292                 if ( !isset( $this->name ) ) {
 293                         $this->assertRepoDefined();
 294                         $this->name = $this->repo->getNameFromTitle( $this->title );
 295                 }
 296
 297                 return $this->name;
 298         }
 299
 300         /**
 301          * Get the file extension, e.g. "svg"
 302          *
 303          * @return string
 304          */
 305         function getExtension() {
 306                 if ( !isset( $this->extension ) ) {
 307                         $n = strrpos( $this->getName(), '.' );
 308                         $this->extension = self::normalizeExtension(
 309                                 $n ? substr( $this->getName(), $n + 1 ) : '' );
 310                 }
 311
 312                 return $this->extension;
 313         }
 314
 315         /**
 316          * Return the associated title object
 317          *
 318          * @return Title
 319          */
 320         public function getTitle() {
 321                 return $this->title;
 322         }
 323
 324         /**
 325          * Return the title used to find this file
 326          *
 327          * @return Title
 328          */
 329         public function getOriginalTitle() {
 330                 if ( $this->redirected ) {
 331                         return $this->getRedirectedTitle();
 332                 }
 333
 334                 return $this->title;
 335         }
 336
 337         /**
 338          * Return the URL of the file
 339          *
 340          * @return string
 341          */
 342         public function getUrl() {
 343                 if ( !isset( $this->url ) ) {
 344                         $this->assertRepoDefined();
 345                         $ext = $this->getExtension();
 346                         $this->url = $this->repo->getZoneUrl( 'public', $ext ) . '/' . $this->getUrlRel();
 347                 }
 348
 349                 return $this->url;
 350         }
 351
 352         /**
 353          * Return a fully-qualified URL to the file.
 354          * Upload URL paths _may or may not_ be fully qualified, so
 355          * we check. Local paths are assumed to belong on $wgServer.
 356          *
 357          * @return string
 358          */
 359         public function getFullUrl() {
 360                 return wfExpandUrl( $this->getUrl(), PROTO_RELATIVE );
 361         }
 362
 363         /**
 364          * @return string
 365          */
 366         public function getCanonicalUrl() {
 367                 return wfExpandUrl( $this->getUrl(), PROTO_CANONICAL );
 368         }
 369
 370         /**
 371          * @return string
 372          */
 373         function getViewURL() {
 374                 if ( $this->mustRender() ) {
 375                         if ( $this->canRender() ) {
 376                                 return $this->createThumb( $this->getWidth() );
 377                         } else {
 378                                 wfDebug( __METHOD__ . ': supposed to render ' . $this->getName() .
 379                                         ' (' . $this->getMimeType() . "), but can't!\n" );
 380
 381                                 return $this->getURL(); #hm... return NULL?
 382                         }
 383                 } else {
 384                         return $this->getURL();
 385                 }
 386         }
 387
 388         /**
 389          * Return the storage path to the file. Note that this does
 390          * not mean that a file actually exists under that location.
 391          *
 392          * This path depends on whether directory hashing is active or not,
 393          * i.e. whether the files are all found in the same directory,
 394          * or in hashed paths like /images/3/3c.
 395          *
 396          * Most callers don't check the return value, but ForeignAPIFile::getPath
 397          * returns false.
 398          *
 399          * @return string|bool ForeignAPIFile::getPath can return false
 400          */
 401         public function getPath() {
 402                 if ( !isset( $this->path ) ) {
 403                         $this->assertRepoDefined();
 404                         $this->path = $this->repo->getZonePath( 'public' ) . '/' . $this->getRel();
 405                 }
 406
 407                 return $this->path;
 408         }
 409
 410         /**
 411          * Get an FS copy or original of this file and return the path.
 412          * Returns false on failure. Callers must not alter the file.
 413          * Temporary files are cleared automatically.
 414          *
 415          * @return string|bool False on failure
 416          */
 417         public function getLocalRefPath() {
 418                 $this->assertRepoDefined();
 419                 if ( !isset( $this->fsFile ) ) {
 420                         $this->fsFile = $this->repo->getLocalReference( $this->getPath() );
 421                         if ( !$this->fsFile ) {
 422                                 $this->fsFile = false; // null => false; cache negative hits
 423                         }
 424                 }
 425
 426                 return ( $this->fsFile )
 427                         ? $this->fsFile->getPath()
 428                         : false;
 429         }
 430
 431         /**
 432          * Return the width of the image. Returns false if the width is unknown
 433          * or undefined.
 434          *
 435          * STUB
 436          * Overridden by LocalFile, UnregisteredLocalFile
 437          *
 438          * @param int $page
 439          * @return int|bool
 440          */
 441         public function getWidth( $page = 1 ) {
 442                 return false;
 443         }
 444
 445         /**
 446          * Return the height of the image. Returns false if the height is unknown
 447          * or undefined
 448          *
 449          * STUB
 450          * Overridden by LocalFile, UnregisteredLocalFile
 451          *
 452          * @param int $page
 453          * @return bool|int False on failure
 454          */
 455         public function getHeight( $page = 1 ) {
 456                 return false;
 457         }
 458
 459         /**
 460          * Returns ID or name of user who uploaded the file
 461          * STUB
 462          *
 463          * @param string $type 'text' or 'id'
 464          * @return string|int
 465          */
 466         public function getUser( $type = 'text' ) {
 467                 return null;
 468         }
 469
 470         /**
 471          * Get the duration of a media file in seconds
 472          *
 473          * @return int
 474          */
 475         public function getLength() {
 476                 $handler = $this->getHandler();
 477                 if ( $handler ) {
 478                         return $handler->getLength( $this );
 479                 } else {
 480                         return 0;
 481                 }
 482         }
 483
 484         /**
 485          * Return true if the file is vectorized
 486          *
 487          * @return bool
 488          */
 489         public function isVectorized() {
 490                 $handler = $this->getHandler();
 491                 if ( $handler ) {
 492                         return $handler->isVectorized( $this );
 493                 } else {
 494                         return false;
 495                 }
 496         }
 497
 498         /**
 499          * Gives a (possibly empty) list of languages to render
 500          * the file in.
 501          *
 502          * If the file doesn't have translations, or if the file
 503          * format does not support that sort of thing, returns
 504          * an empty array.
 505          *
 506          * @return Array
 507          * @since 1.23
 508          */
 509         public function getAvailableLanguages() {
 510                 $handler = $this->getHandler();
 511                 if ( $handler ) {
 512                         return $handler->getAvailableLanguages( $this );
 513                 } else {
 514                         return array();
 515                 }
 516         }
 517
 518         /**
 519          * In files that support multiple language, what is the default language
 520          * to use if none specified.
 521          *
 522          * @return String lang code, or null if filetype doesn't support multiple languages.
 523          * @since 1.23
 524          */
 525         public function getDefaultRenderLanguage() {
 526                 $handler = $this->getHandler();
 527                 if ( $handler ) {
 528                         return $handler->getDefaultRenderLanguage( $this );
 529                 } else {
 530                         return null;
 531                 }
 532         }
 533
 534         /**
 535          * Will the thumbnail be animated if one would expect it to be.
 536          *
 537          * Currently used to add a warning to the image description page
 538          *
 539          * @return bool false if the main image is both animated
 540          *   and the thumbnail is not. In all other cases must return
 541          *   true. If image is not renderable whatsoever, should
 542          *   return true.
 543          */
 544         public function canAnimateThumbIfAppropriate() {
 545                 $handler = $this->getHandler();
 546                 if ( !$handler ) {
 547                         // We cannot handle image whatsoever, thus
 548                         // one would not expect it to be animated
 549                         // so true.
 550                         return true;
 551                 } else {
 552                         if ( $this->allowInlineDisplay()
 553                                 && $handler->isAnimatedImage( $this )
 554                                 && !$handler->canAnimateThumbnail( $this )
 555                         ) {
 556                                 // Image is animated, but thumbnail isn't.
 557                                 // This is unexpected to the user.
 558                                 return false;
 559                         } else {
 560                                 // Image is not animated, so one would
 561                                 // not expect thumb to be
 562                                 return true;
 563                         }
 564                 }
 565         }
 566
 567         /**
 568          * Get handler-specific metadata
 569          * Overridden by LocalFile, UnregisteredLocalFile
 570          * STUB
 571          * @return bool|array
 572          */
 573         public function getMetadata() {
 574                 return false;
 575         }
 576
 577         /**
 578          * Like getMetadata but returns a handler independent array of common values.
 579          * @see MediaHandler::getCommonMetaArray()
 580          * @return array|bool Array or false if not supported
 581          * @since 1.23
 582          */
 583         public function getCommonMetaArray() {
 584                 $handler = $this->getHandler();
 585
 586                 if ( !$handler ) {
 587                         return false;
 588                 }
 589
 590                 return $handler->getCommonMetaArray( $this );
 591         }
 592
 593         /**
 594          * get versioned metadata
 595          *
 596          * @param array|string $metadata Array or string of (serialized) metadata
 597          * @param int $version Version number.
 598          * @return array Array containing metadata, or what was passed to it on fail
 599          *   (unserializing if not array)
 600          */
 601         public function convertMetadataVersion( $metadata, $version ) {
 602                 $handler = $this->getHandler();
 603                 if ( !is_array( $metadata ) ) {
 604                         // Just to make the return type consistent
 605                         $metadata = unserialize( $metadata );
 606                 }
 607                 if ( $handler ) {
 608                         return $handler->convertMetadataVersion( $metadata, $version );
 609                 } else {
 610                         return $metadata;
 611                 }
 612         }
 613
 614         /**
 615          * Return the bit depth of the file
 616          * Overridden by LocalFile
 617          * STUB
 618          * @return int
 619          */
 620         public function getBitDepth() {
 621                 return 0;
 622         }
 623
 624         /**
 625          * Return the size of the image file, in bytes
 626          * Overridden by LocalFile, UnregisteredLocalFile
 627          * STUB
 628          * @return bool
 629          */
 630         public function getSize() {
 631                 return false;
 632         }
 633
 634         /**
 635          * Returns the mime type of the file.
 636          * Overridden by LocalFile, UnregisteredLocalFile
 637          * STUB
 638          *
 639          * @return string
 640          */
 641         function getMimeType() {
 642                 return 'unknown/unknown';
 643         }
 644
 645         /**
 646          * Return the type of the media in the file.
 647          * Use the value returned by this function with the MEDIATYPE_xxx constants.
 648          * Overridden by LocalFile,
 649          * STUB
 650          * @return string
 651          */
 652         function getMediaType() {
 653                 return MEDIATYPE_UNKNOWN;
 654         }
 655
 656         /**
 657          * Checks if the output of transform() for this file is likely
 658          * to be valid. If this is false, various user elements will
 659          * display a placeholder instead.
 660          *
 661          * Currently, this checks if the file is an image format
 662          * that can be converted to a format
 663          * supported by all browsers (namely GIF, PNG and JPEG),
 664          * or if it is an SVG image and SVG conversion is enabled.
 665          *
 666          * @return bool
 667          */
 668         function canRender() {
 669                 if ( !isset( $this->canRender ) ) {
 670                         $this->canRender = $this->getHandler() && $this->handler->canRender( $this );
 671                 }
 672
 673                 return $this->canRender;
 674         }
 675
 676         /**
 677          * Accessor for __get()
 678          * @return bool
 679          */
 680         protected function getCanRender() {
 681                 return $this->canRender();
 682         }
 683
 684         /**
 685          * Return true if the file is of a type that can't be directly
 686          * rendered by typical browsers and needs to be re-rasterized.
 687          *
 688          * This returns true for everything but the bitmap types
 689          * supported by all browsers, i.e. JPEG; GIF and PNG. It will
 690          * also return true for any non-image formats.
 691          *
 692          * @return bool
 693          */
 694         function mustRender() {
 695                 return $this->getHandler() && $this->handler->mustRender( $this );
 696         }
 697
 698         /**
 699          * Alias for canRender()
 700          *
 701          * @return bool
 702          */
 703         function allowInlineDisplay() {
 704                 return $this->canRender();
 705         }
 706
 707         /**
 708          * Determines if this media file is in a format that is unlikely to
 709          * contain viruses or malicious content. It uses the global
 710          * $wgTrustedMediaFormats list to determine if the file is safe.
 711          *
 712          * This is used to show a warning on the description page of non-safe files.
 713          * It may also be used to disallow direct [[media:...]] links to such files.
 714          *
 715          * Note that this function will always return true if allowInlineDisplay()
 716          * or isTrustedFile() is true for this file.
 717          *
 718          * @return bool
 719          */
 720         function isSafeFile() {
 721                 if ( !isset( $this->isSafeFile ) ) {
 722                         $this->isSafeFile = $this->getIsSafeFileUncached();
 723                 }
 724
 725                 return $this->isSafeFile;
 726         }
 727
 728         /**
 729          * Accessor for __get()
 730          *
 731          * @return bool
 732          */
 733         protected function getIsSafeFile() {
 734                 return $this->isSafeFile();
 735         }
 736
 737         /**
 738          * Uncached accessor
 739          *
 740          * @return bool
 741          */
 742         protected function getIsSafeFileUncached() {
 743                 global $wgTrustedMediaFormats;
 744
 745                 if ( $this->allowInlineDisplay() ) {
 746                         return true;
 747                 }
 748                 if ( $this->isTrustedFile() ) {
 749                         return true;
 750                 }
 751
 752                 $type = $this->getMediaType();
 753                 $mime = $this->getMimeType();
 754                 #wfDebug( "LocalFile::isSafeFile: type= $type, mime= $mime\n" );
 755
 756                 if ( !$type || $type === MEDIATYPE_UNKNOWN ) {
 757                         return false; #unknown type, not trusted
 758                 }
 759                 if ( in_array( $type, $wgTrustedMediaFormats ) ) {
 760                         return true;
 761                 }
 762
 763                 if ( $mime === "unknown/unknown" ) {
 764                         return false; #unknown type, not trusted
 765                 }
 766                 if ( in_array( $mime, $wgTrustedMediaFormats ) ) {
 767                         return true;
 768                 }
 769
 770                 return false;
 771         }
 772
 773         /**
 774          * Returns true if the file is flagged as trusted. Files flagged that way
 775          * can be linked to directly, even if that is not allowed for this type of
 776          * file normally.
 777          *
 778          * This is a dummy function right now and always returns false. It could be
 779          * implemented to extract a flag from the database. The trusted flag could be
 780          * set on upload, if the user has sufficient privileges, to bypass script-
 781          * and html-filters. It may even be coupled with cryptographics signatures
 782          * or such.
 783          *
 784          * @return bool
 785          */
 786         function isTrustedFile() {
 787                 #this could be implemented to check a flag in the database,
 788                 #look for signatures, etc
 789                 return false;
 790         }
 791
 792         /**
 793          * Returns true if file exists in the repository.
 794          *
 795          * Overridden by LocalFile to avoid unnecessary stat calls.
 796          *
 797          * @return bool Whether file exists in the repository.
 798          */
 799         public function exists() {
 800                 return $this->getPath() && $this->repo->fileExists( $this->path );
 801         }
 802
 803         /**
 804          * Returns true if file exists in the repository and can be included in a page.
 805          * It would be unsafe to include private images, making public thumbnails inadvertently
 806          *
 807          * @return bool Whether file exists in the repository and is includable.
 808          */
 809         public function isVisible() {
 810                 return $this->exists();
 811         }
 812
 813         /**
 814          * @return string
 815          */
 816         function getTransformScript() {
 817                 if ( !isset( $this->transformScript ) ) {
 818                         $this->transformScript = false;
 819                         if ( $this->repo ) {
 820                                 $script = $this->repo->getThumbScriptUrl();
 821                                 if ( $script ) {
 822                                         $this->transformScript = wfAppendQuery( $script, array( 'f' => $this->getName() ) );
 823                                 }
 824                         }
 825                 }
 826
 827                 return $this->transformScript;
 828         }
 829
 830         /**
 831          * Get a ThumbnailImage which is the same size as the source
 832          *
 833          * @param array $handlerParams
 834          *
 835          * @return string
 836          */
 837         function getUnscaledThumb( $handlerParams = array() ) {
 838                 $hp =& $handlerParams;
 839                 $page = isset( $hp['page'] ) ? $hp['page'] : false;
 840                 $width = $this->getWidth( $page );
 841                 if ( !$width ) {
 842                         return $this->iconThumb();
 843                 }
 844                 $hp['width'] = $width;
 845                 // be sure to ignore any height specification as well (bug 62258)
 846                 unset( $hp['height'] );
 847
 848                 return $this->transform( $hp );
 849         }
 850
 851         /**
 852          * Return the file name of a thumbnail with the specified parameters.
 853          * Use File::THUMB_FULL_NAME to always get a name like "<params>-<source>".
 854          * Otherwise, the format may be "<params>-<source>" or "<params>-thumbnail.<ext>".
 855          *
 856          * @param array $params handler-specific parameters
 857          * @param int $flags Bitfield that supports THUMB_* constants
 858          * @return string
 859          */
 860         public function thumbName( $params, $flags = 0 ) {
 861                 $name = ( $this->repo && !( $flags & self::THUMB_FULL_NAME ) )
 862                         ? $this->repo->nameForThumb( $this->getName() )
 863                         : $this->getName();
 864
 865                 return $this->generateThumbName( $name, $params );
 866         }
 867
 868         /**
 869          * Generate a thumbnail file name from a name and specified parameters
 870          *
 871          * @param string $name
 872          * @param array $params Parameters which will be passed to MediaHandler::makeParamString
 873          * @return string
 874          */
 875         public function generateThumbName( $name, $params ) {
 876                 if ( !$this->getHandler() ) {
 877                         return null;
 878                 }
 879                 $extension = $this->getExtension();
 880                 list( $thumbExt, ) = $this->handler->getThumbType(
 881                         $extension, $this->getMimeType(), $params );
 882                 $thumbName = $this->handler->makeParamString( $params ) . '-' . $name;
 883                 if ( $thumbExt != $extension ) {
 884                         $thumbName .= ".$thumbExt";
 885                 }
 886
 887                 return $thumbName;
 888         }
 889
 890         /**
 891          * Create a thumbnail of the image having the specified width/height.
 892          * The thumbnail will not be created if the width is larger than the
 893          * image's width. Let the browser do the scaling in this case.
 894          * The thumbnail is stored on disk and is only computed if the thumbnail
 895          * file does not exist OR if it is older than the image.
 896          * Returns the URL.
 897          *
 898          * Keeps aspect ratio of original image. If both width and height are
 899          * specified, the generated image will be no bigger than width x height,
 900          * and will also have correct aspect ratio.
 901          *
 902          * @param int $width Maximum width of the generated thumbnail
 903          * @param int $height Maximum height of the image (optional)
 904          *
 905          * @return string
 906          */
 907         public function createThumb( $width, $height = -1 ) {
 908                 $params = array( 'width' => $width );
 909                 if ( $height != -1 ) {
 910                         $params['height'] = $height;
 911                 }
 912                 $thumb = $this->transform( $params );
 913                 if ( !$thumb || $thumb->isError() ) {
 914                         return '';
 915                 }
 916
 917                 return $thumb->getUrl();
 918         }
 919
 920         /**
 921          * Return either a MediaTransformError or placeholder thumbnail (if $wgIgnoreImageErrors)
 922          *
 923          * @param string $thumbPath Thumbnail storage path
 924          * @param string $thumbUrl Thumbnail URL
 925          * @param array $params
 926          * @param int $flags
 927          * @return MediaTransformOutput
 928          */
 929         protected function transformErrorOutput( $thumbPath, $thumbUrl, $params, $flags ) {
 930                 global $wgIgnoreImageErrors;
 931
 932                 $handler = $this->getHandler();
 933                 if ( $handler && $wgIgnoreImageErrors && !( $flags & self::RENDER_NOW ) ) {
 934                         return $handler->getTransform( $this, $thumbPath, $thumbUrl, $params );
 935                 } else {
 936                         return new MediaTransformError( 'thumbnail_error',
 937                                 $params['width'], 0, wfMessage( 'thumbnail-dest-create' )->text() );
 938                 }
 939         }
 940
 941         /**
 942          * Transform a media file
 943          *
 944          * @param array $params an associative array of handler-specific parameters.
 945          *   Typical keys are width, height and page.
 946          * @param int $flags A bitfield, may contain self::RENDER_NOW to force rendering
 947          * @return MediaTransformOutput|bool False on failure
 948          */
 949         function transform( $params, $flags = 0 ) {
 950                 global $wgUseSquid, $wgIgnoreImageErrors, $wgThumbnailEpoch;
 951
 952                 wfProfileIn( __METHOD__ );
 953                 do {
 954                         if ( !$this->canRender() ) {
 955                                 $thumb = $this->iconThumb();
 956                                 break; // not a bitmap or renderable image, don't try
 957                         }
 958
 959                         // Get the descriptionUrl to embed it as comment into the thumbnail. Bug 19791.
 960                         $descriptionUrl = $this->getDescriptionUrl();
 961                         if ( $descriptionUrl ) {
 962                                 $params['descriptionUrl'] = wfExpandUrl( $descriptionUrl, PROTO_CANONICAL );
 963                         }
 964
 965                         $handler = $this->getHandler();
 966                         $script = $this->getTransformScript();
 967                         if ( $script && !( $flags & self::RENDER_NOW ) ) {
 968                                 // Use a script to transform on client request, if possible
 969                                 $thumb = $handler->getScriptedTransform( $this, $script, $params );
 970                                 if ( $thumb ) {
 971                                         break;
 972                                 }
 973                         }
 974
 975                         $normalisedParams = $params;
 976                         $handler->normaliseParams( $this, $normalisedParams );
 977
 978                         $thumbName = $this->thumbName( $normalisedParams );
 979                         $thumbUrl = $this->getThumbUrl( $thumbName );
 980                         $thumbPath = $this->getThumbPath( $thumbName ); // final thumb path
 981
 982                         if ( $this->repo ) {
 983                                 // Defer rendering if a 404 handler is set up...
 984                                 if ( $this->repo->canTransformVia404() && !( $flags & self::RENDER_NOW ) ) {
 985                                         wfDebug( __METHOD__ . " transformation deferred.\n" );
 986                                         // XXX: Pass in the storage path even though we are not rendering anything
 987                                         // and the path is supposed to be an FS path. This is due to getScalerType()
 988                                         // getting called on the path and clobbering $thumb->getUrl() if it's false.
 989                                         $thumb = $handler->getTransform( $this, $thumbPath, $thumbUrl, $params );
 990                                         break;
 991                                 }
 992                                 // Clean up broken thumbnails as needed
 993                                 $this->migrateThumbFile( $thumbName );
 994                                 // Check if an up-to-date thumbnail already exists...
 995                                 wfDebug( __METHOD__ . ": Doing stat for $thumbPath\n" );
 996                                 if ( !( $flags & self::RENDER_FORCE ) && $this->repo->fileExists( $thumbPath ) ) {
 997                                         $timestamp = $this->repo->getFileTimestamp( $thumbPath );
 998                                         if ( $timestamp !== false && $timestamp >= $wgThumbnailEpoch ) {
 999                                                 // XXX: Pass in the storage path even though we are not rendering anything
1000                                                 // and the path is supposed to be an FS path. This is due to getScalerType()
1001                                                 // getting called on the path and clobbering $thumb->getUrl() if it's false.
1002                                                 $thumb = $handler->getTransform( $this, $thumbPath, $thumbUrl, $params );
1003                                                 $thumb->setStoragePath( $thumbPath );
1004                                                 break;
1005                                         }
1006                                 } elseif ( $flags & self::RENDER_FORCE ) {
1007                                         wfDebug( __METHOD__ . " forcing rendering per flag File::RENDER_FORCE\n" );
1008                                 }
1009                         }
1010
1011                         // If the backend is ready-only, don't keep generating thumbnails
1012                         // only to return transformation errors, just return the error now.
1013                         if ( $this->repo->getReadOnlyReason() !== false ) {
1014                                 $thumb = $this->transformErrorOutput( $thumbPath, $thumbUrl, $params, $flags );
1015                                 break;
1016                         }
1017
1018                         // Create a temp FS file with the same extension and the thumbnail
1019                         $thumbExt = FileBackend::extensionFromPath( $thumbPath );
1020                         $tmpFile = TempFSFile::factory( 'transform_', $thumbExt );
1021                         if ( !$tmpFile ) {
1022                                 $thumb = $this->transformErrorOutput( $thumbPath, $thumbUrl, $params, $flags );
1023                                 break;
1024                         }
1025                         $tmpThumbPath = $tmpFile->getPath(); // path of 0-byte temp file
1026
1027                         // Actually render the thumbnail...
1028                         wfProfileIn( __METHOD__ . '-doTransform' );
1029                         $thumb = $handler->doTransform( $this, $tmpThumbPath, $thumbUrl, $params );
1030                         wfProfileOut( __METHOD__ . '-doTransform' );
1031                         $tmpFile->bind( $thumb ); // keep alive with $thumb
1032
1033                         if ( !$thumb ) { // bad params?
1034                                 $thumb = null;
1035                         } elseif ( $thumb->isError() ) { // transform error
1036                                 $this->lastError = $thumb->toText();
1037                                 // Ignore errors if requested
1038                                 if ( $wgIgnoreImageErrors && !( $flags & self::RENDER_NOW ) ) {
1039                                         $thumb = $handler->getTransform( $this, $tmpThumbPath, $thumbUrl, $params );
1040                                 }
1041                         } elseif ( $this->repo && $thumb->hasFile() && !$thumb->fileIsSource() ) {
1042                                 // Copy the thumbnail from the file system into storage...
1043                                 $disposition = $this->getThumbDisposition( $thumbName );
1044                                 $status = $this->repo->quickImport( $tmpThumbPath, $thumbPath, $disposition );
1045                                 if ( $status->isOK() ) {
1046                                         $thumb->setStoragePath( $thumbPath );
1047                                 } else {
1048                                         $thumb = $this->transformErrorOutput( $thumbPath, $thumbUrl, $params, $flags );
1049                                 }
1050                                 // Give extensions a chance to do something with this thumbnail...
1051                                 wfRunHooks( 'FileTransformed', array( $this, $thumb, $tmpThumbPath, $thumbPath ) );
1052                         }
1053
1054                         // Purge. Useful in the event of Core -> Squid connection failure or squid
1055                         // purge collisions from elsewhere during failure. Don't keep triggering for
1056                         // "thumbs" which have the main image URL though (bug 13776)
1057                         if ( $wgUseSquid ) {
1058                                 if ( !$thumb || $thumb->isError() || $thumb->getUrl() != $this->getURL() ) {
1059                                         SquidUpdate::purge( array( $thumbUrl ) );
1060                                 }
1061                         }
1062                 } while ( false );
1063
1064                 wfProfileOut( __METHOD__ );
1065
1066                 return is_object( $thumb ) ? $thumb : false;
1067         }
1068
1069         /**
1070          * @param string $thumbName Thumbnail name
1071          * @param string $dispositionType Type of disposition (either "attachment" or "inline")
1072          * @return string Content-Disposition header value
1073          */
1074         function getThumbDisposition( $thumbName, $dispositionType = 'inline' ) {
1075                 $fileName = $this->name; // file name to suggest
1076                 $thumbExt = FileBackend::extensionFromPath( $thumbName );
1077                 if ( $thumbExt != '' && $thumbExt !== $this->getExtension() ) {
1078                         $fileName .= ".$thumbExt";
1079                 }
1080
1081                 return FileBackend::makeContentDisposition( $dispositionType, $fileName );
1082         }
1083
1084         /**
1085          * Hook into transform() to allow migration of thumbnail files
1086          * STUB
1087          * Overridden by LocalFile
1088          */
1089         function migrateThumbFile( $thumbName ) {
1090         }
1091
1092         /**
1093          * Get a MediaHandler instance for this file
1094          *
1095          * @return MediaHandler|bool Registered MediaHandler for file's MIME type
1096          *   or false if none found
1097          */
1098         function getHandler() {
1099                 if ( !isset( $this->handler ) ) {
1100                         $this->handler = MediaHandler::getHandler( $this->getMimeType() );
1101                 }
1102
1103                 return $this->handler;
1104         }
1105
1106         /**
1107          * Get a ThumbnailImage representing a file type icon
1108          *
1109          * @return ThumbnailImage
1110          */
1111         function iconThumb() {
1112                 global $wgStylePath, $wgStyleDirectory;
1113
1114                 $try = array( 'fileicon-' . $this->getExtension() . '.png', 'fileicon.png' );
1115                 foreach ( $try as $icon ) {
1116                         $path = '/common/images/icons/' . $icon;
1117                         $filepath = $wgStyleDirectory . $path;
1118                         if ( file_exists( $filepath ) ) { // always FS
1119                                 $params = array( 'width' => 120, 'height' => 120 );
1120
1121                                 return new ThumbnailImage( $this, $wgStylePath . $path, false, $params );
1122                         }
1123                 }
1124
1125                 return null;
1126         }
1127
1128         /**
1129          * Get last thumbnailing error.
1130          * Largely obsolete.
1131          */
1132         function getLastError() {
1133                 return $this->lastError;
1134         }
1135
1136         /**
1137          * Get all thumbnail names previously generated for this file
1138          * STUB
1139          * Overridden by LocalFile
1140          * @return array
1141          */
1142         function getThumbnails() {
1143                 return array();
1144         }
1145
1146         /**
1147          * Purge shared caches such as thumbnails and DB data caching
1148          * STUB
1149          * Overridden by LocalFile
1150          * @param array $options Options, which include:
1151          *   'forThumbRefresh' : The purging is only to refresh thumbnails
1152          */
1153         function purgeCache( $options = array() ) {
1154         }
1155
1156         /**
1157          * Purge the file description page, but don't go after
1158          * pages using the file. Use when modifying file history
1159          * but not the current data.
1160          */
1161         function purgeDescription() {
1162                 $title = $this->getTitle();
1163                 if ( $title ) {
1164                         $title->invalidateCache();
1165                         $title->purgeSquid();
1166                 }
1167         }
1168
1169         /**
1170          * Purge metadata and all affected pages when the file is created,
1171          * deleted, or majorly updated.
1172          */
1173         function purgeEverything() {
1174                 // Delete thumbnails and refresh file metadata cache
1175                 $this->purgeCache();
1176                 $this->purgeDescription();
1177
1178                 // Purge cache of all pages using this file
1179                 $title = $this->getTitle();
1180                 if ( $title ) {
1181                         $update = new HTMLCacheUpdate( $title, 'imagelinks' );
1182                         $update->doUpdate();
1183                 }
1184         }
1185
1186         /**
1187          * Return a fragment of the history of file.
1188          *
1189          * STUB
1190          * @param int $limit Limit of rows to return
1191          * @param string $start timestamp Only revisions older than $start will be returned
1192          * @param string $end timestamp Only revisions newer than $end will be returned
1193          * @param bool $inc Include the endpoints of the time range
1194          *
1195          * @return array
1196          */
1197         function getHistory( $limit = null, $start = null, $end = null, $inc = true ) {
1198                 return array();
1199         }
1200
1201         /**
1202          * Return the history of this file, line by line. Starts with current version,
1203          * then old versions. Should return an object similar to an image/oldimage
1204          * database row.
1205          *
1206          * STUB
1207          * Overridden in LocalFile
1208          * @return bool
1209          */
1210         public function nextHistoryLine() {
1211                 return false;
1212         }
1213
1214         /**
1215          * Reset the history pointer to the first element of the history.
1216          * Always call this function after using nextHistoryLine() to free db resources
1217          * STUB
1218          * Overridden in LocalFile.
1219          */
1220         public function resetHistory() {
1221         }
1222
1223         /**
1224          * Get the filename hash component of the directory including trailing slash,
1225          * e.g. f/fa/
1226          * If the repository is not hashed, returns an empty string.
1227          *
1228          * @return string
1229          */
1230         function getHashPath() {
1231                 if ( !isset( $this->hashPath ) ) {
1232                         $this->assertRepoDefined();
1233                         $this->hashPath = $this->repo->getHashPath( $this->getName() );
1234                 }
1235
1236                 return $this->hashPath;
1237         }
1238
1239         /**
1240          * Get the path of the file relative to the public zone root.
1241          * This function is overriden in OldLocalFile to be like getArchiveRel().
1242          *
1243          * @return string
1244          */
1245         function getRel() {
1246                 return $this->getHashPath() . $this->getName();
1247         }
1248
1249         /**
1250          * Get the path of an archived file relative to the public zone root
1251          *
1252          * @param bool|string $suffix if not false, the name of an archived thumbnail file
1253          *
1254          * @return string
1255          */
1256         function getArchiveRel( $suffix = false ) {
1257                 $path = 'archive/' . $this->getHashPath();
1258                 if ( $suffix === false ) {
1259                         $path = substr( $path, 0, -1 );
1260                 } else {
1261                         $path .= $suffix;
1262                 }
1263
1264                 return $path;
1265         }
1266
1267         /**
1268          * Get the path, relative to the thumbnail zone root, of the
1269          * thumbnail directory or a particular file if $suffix is specified
1270          *
1271          * @param bool|string $suffix if not false, the name of a thumbnail file
1272          * @return string
1273          */
1274         function getThumbRel( $suffix = false ) {
1275                 $path = $this->getRel();
1276                 if ( $suffix !== false ) {
1277                         $path .= '/' . $suffix;
1278                 }
1279
1280                 return $path;
1281         }
1282
1283         /**
1284          * Get urlencoded path of the file relative to the public zone root.
1285          * This function is overriden in OldLocalFile to be like getArchiveUrl().
1286          *
1287          * @return string
1288          */
1289         function getUrlRel() {
1290                 return $this->getHashPath() . rawurlencode( $this->getName() );
1291         }
1292
1293         /**
1294          * Get the path, relative to the thumbnail zone root, for an archived file's thumbs directory
1295          * or a specific thumb if the $suffix is given.
1296          *
1297          * @param string $archiveName the timestamped name of an archived image
1298          * @param bool|string $suffix if not false, the name of a thumbnail file
1299          * @return string
1300          */
1301         function getArchiveThumbRel( $archiveName, $suffix = false ) {
1302                 $path = 'archive/' . $this->getHashPath() . $archiveName . "/";
1303                 if ( $suffix === false ) {
1304                         $path = substr( $path, 0, -1 );
1305                 } else {
1306                         $path .= $suffix;
1307                 }
1308
1309                 return $path;
1310         }
1311
1312         /**
1313          * Get the path of the archived file.
1314          *
1315          * @param bool|string $suffix if not false, the name of an archived file.
1316          * @return string
1317          */
1318         function getArchivePath( $suffix = false ) {
1319                 $this->assertRepoDefined();
1320
1321                 return $this->repo->getZonePath( 'public' ) . '/' . $this->getArchiveRel( $suffix );
1322         }
1323
1324         /**
1325          * Get the path of an archived file's thumbs, or a particular thumb if $suffix is specified
1326          *
1327          * @param string $archiveName the timestamped name of an archived image
1328          * @param bool|string $suffix if not false, the name of a thumbnail file
1329          * @return string
1330          */
1331         function getArchiveThumbPath( $archiveName, $suffix = false ) {
1332                 $this->assertRepoDefined();
1333
1334                 return $this->repo->getZonePath( 'thumb' ) . '/' .
1335                 $this->getArchiveThumbRel( $archiveName, $suffix );
1336         }
1337
1338         /**
1339          * Get the path of the thumbnail directory, or a particular file if $suffix is specified
1340          *
1341          * @param bool|string $suffix If not false, the name of a thumbnail file
1342          * @return string
1343          */
1344         function getThumbPath( $suffix = false ) {
1345                 $this->assertRepoDefined();
1346
1347                 return $this->repo->getZonePath( 'thumb' ) . '/' . $this->getThumbRel( $suffix );
1348         }
1349
1350         /**
1351          * Get the path of the transcoded directory, or a particular file if $suffix is specified
1352          *
1353          * @param bool|string $suffix If not false, the name of a media file
1354          * @return string
1355          */
1356         function getTranscodedPath( $suffix = false ) {
1357                 $this->assertRepoDefined();
1358
1359                 return $this->repo->getZonePath( 'transcoded' ) . '/' . $this->getThumbRel( $suffix );
1360         }
1361
1362         /**
1363          * Get the URL of the archive directory, or a particular file if $suffix is specified
1364          *
1365          * @param bool|string $suffix If not false, the name of an archived file
1366          * @return string
1367          */
1368         function getArchiveUrl( $suffix = false ) {
1369                 $this->assertRepoDefined();
1370                 $ext = $this->getExtension();
1371                 $path = $this->repo->getZoneUrl( 'public', $ext ) . '/archive/' . $this->getHashPath();
1372                 if ( $suffix === false ) {
1373                         $path = substr( $path, 0, -1 );
1374                 } else {
1375                         $path .= rawurlencode( $suffix );
1376                 }
1377
1378                 return $path;
1379         }
1380
1381         /**
1382          * Get the URL of the archived file's thumbs, or a particular thumb if $suffix is specified
1383          *
1384          * @param string $archiveName the timestamped name of an archived image
1385          * @param bool|string $suffix If not false, the name of a thumbnail file
1386          * @return string
1387          */
1388         function getArchiveThumbUrl( $archiveName, $suffix = false ) {
1389                 $this->assertRepoDefined();
1390                 $ext = $this->getExtension();
1391                 $path = $this->repo->getZoneUrl( 'thumb', $ext ) . '/archive/' .
1392                         $this->getHashPath() . rawurlencode( $archiveName ) . "/";
1393                 if ( $suffix === false ) {
1394                         $path = substr( $path, 0, -1 );
1395                 } else {
1396                         $path .= rawurlencode( $suffix );
1397                 }
1398
1399                 return $path;
1400         }
1401
1402         /**
1403          * Get the URL of the zone directory, or a particular file if $suffix is specified
1404          *
1405          * @param string $zone name of requested zone
1406          * @param bool|string $suffix If not false, the name of a file in zone
1407          * @return string path
1408          */
1409         function getZoneUrl( $zone, $suffix = false ) {
1410                 $this->assertRepoDefined();
1411                 $ext = $this->getExtension();
1412                 $path = $this->repo->getZoneUrl( $zone, $ext ) . '/' . $this->getUrlRel();
1413                 if ( $suffix !== false ) {
1414                         $path .= '/' . rawurlencode( $suffix );
1415                 }
1416
1417                 return $path;
1418         }
1419
1420         /**
1421          * Get the URL of the thumbnail directory, or a particular file if $suffix is specified
1422          *
1423          * @param bool|string $suffix if not false, the name of a thumbnail file
1424          * @return string path
1425          */
1426         function getThumbUrl( $suffix = false ) {
1427                 return $this->getZoneUrl( 'thumb', $suffix );
1428         }
1429
1430         /**
1431          * Get the URL of the transcoded directory, or a particular file if $suffix is specified
1432          *
1433          * @param bool|string $suffix If not false, the name of a media file
1434          * @return string path
1435          */
1436         function getTranscodedUrl( $suffix = false ) {
1437                 return $this->getZoneUrl( 'transcoded', $suffix );
1438         }
1439
1440         /**
1441          * Get the public zone virtual URL for a current version source file
1442          *
1443          * @param bool|string $suffix If not false, the name of a thumbnail file
1444          * @return string
1445          */
1446         function getVirtualUrl( $suffix = false ) {
1447                 $this->assertRepoDefined();
1448                 $path = $this->repo->getVirtualUrl() . '/public/' . $this->getUrlRel();
1449                 if ( $suffix !== false ) {
1450                         $path .= '/' . rawurlencode( $suffix );
1451                 }
1452
1453                 return $path;
1454         }
1455
1456         /**
1457          * Get the public zone virtual URL for an archived version source file
1458          *
1459          * @param bool|string $suffix If not false, the name of a thumbnail file
1460          * @return string
1461          */
1462         function getArchiveVirtualUrl( $suffix = false ) {
1463                 $this->assertRepoDefined();
1464                 $path = $this->repo->getVirtualUrl() . '/public/archive/' . $this->getHashPath();
1465                 if ( $suffix === false ) {
1466                         $path = substr( $path, 0, -1 );
1467                 } else {
1468                         $path .= rawurlencode( $suffix );
1469                 }
1470
1471                 return $path;
1472         }
1473
1474         /**
1475          * Get the virtual URL for a thumbnail file or directory
1476          *
1477          * @param bool|string $suffix If not false, the name of a thumbnail file
1478          * @return string
1479          */
1480         function getThumbVirtualUrl( $suffix = false ) {
1481                 $this->assertRepoDefined();
1482                 $path = $this->repo->getVirtualUrl() . '/thumb/' . $this->getUrlRel();
1483                 if ( $suffix !== false ) {
1484                         $path .= '/' . rawurlencode( $suffix );
1485                 }
1486
1487                 return $path;
1488         }
1489
1490         /**
1491          * @return bool
1492          */
1493         function isHashed() {
1494                 $this->assertRepoDefined();
1495
1496                 return (bool)$this->repo->getHashLevels();
1497         }
1498
1499         /**
1500          * @throws MWException
1501          */
1502         function readOnlyError() {
1503                 throw new MWException( get_class( $this ) . ': write operations are not supported' );
1504         }
1505
1506         /**
1507          * Record a file upload in the upload log and the image table
1508          * STUB
1509          * Overridden by LocalFile
1510          * @param $oldver
1511          * @param $desc
1512          * @param string $license
1513          * @param string $copyStatus
1514          * @param string $source
1515          * @param bool $watch
1516          * @param string|bool $timestamp
1517          * @param null|User $user User object or null to use $wgUser
1518          * @return bool
1519          * @throws MWException
1520          */
1521         function recordUpload( $oldver, $desc, $license = '', $copyStatus = '', $source = '',
1522                 $watch = false, $timestamp = false, User $user = null
1523         ) {
1524                 $this->readOnlyError();
1525         }
1526
1527         /**
1528          * Move or copy a file to its public location. If a file exists at the
1529          * destination, move it to an archive. Returns a FileRepoStatus object with
1530          * the archive name in the "value" member on success.
1531          *
1532          * The archive name should be passed through to recordUpload for database
1533          * registration.
1534          *
1535          * Options to $options include:
1536          *   - headers : name/value map of HTTP headers to use in response to GET/HEAD requests
1537          *
1538          * @param string $srcPath local filesystem path to the source image
1539          * @param int $flags A bitwise combination of:
1540          *   File::DELETE_SOURCE    Delete the source file, i.e. move rather than copy
1541          * @param array $options Optional additional parameters
1542          * @return FileRepoStatus object. On success, the value member contains the
1543          *   archive name, or an empty string if it was a new file.
1544          *
1545          * STUB
1546          * Overridden by LocalFile
1547          */
1548         function publish( $srcPath, $flags = 0, array $options = array() ) {
1549                 $this->readOnlyError();
1550         }
1551
1552         /**
1553          * @return bool
1554          */
1555         function formatMetadata() {
1556                 if ( !$this->getHandler() ) {
1557                         return false;
1558                 }
1559
1560                 return $this->getHandler()->formatMetadata( $this, $this->getMetadata() );
1561         }
1562
1563         /**
1564          * Returns true if the file comes from the local file repository.
1565          *
1566          * @return bool
1567          */
1568         function isLocal() {
1569                 return $this->repo && $this->repo->isLocal();
1570         }
1571
1572         /**
1573          * Returns the name of the repository.
1574          *
1575          * @return string
1576          */
1577         function getRepoName() {
1578                 return $this->repo ? $this->repo->getName() : 'unknown';
1579         }
1580
1581         /**
1582          * Returns the repository
1583          *
1584          * @return FileRepo|LocalRepo|bool
1585          */
1586         function getRepo() {
1587                 return $this->repo;
1588         }
1589
1590         /**
1591          * Returns true if the image is an old version
1592          * STUB
1593          *
1594          * @return bool
1595          */
1596         function isOld() {
1597                 return false;
1598         }
1599
1600         /**
1601          * Is this file a "deleted" file in a private archive?
1602          * STUB
1603          *
1604          * @param int $field one of DELETED_* bitfield constants
1605          * @return bool
1606          */
1607         function isDeleted( $field ) {
1608                 return false;
1609         }
1610
1611         /**
1612          * Return the deletion bitfield
1613          * STUB
1614          * @return int
1615          */
1616         function getVisibility() {
1617                 return 0;
1618         }
1619
1620         /**
1621          * Was this file ever deleted from the wiki?
1622          *
1623          * @return bool
1624          */
1625         function wasDeleted() {
1626                 $title = $this->getTitle();
1627
1628                 return $title && $title->isDeletedQuick();
1629         }
1630
1631         /**
1632          * Move file to the new title
1633          *
1634          * Move current, old version and all thumbnails
1635          * to the new filename. Old file is deleted.
1636          *
1637          * Cache purging is done; checks for validity
1638          * and logging are caller's responsibility
1639          *
1640          * @param Title $target New file name
1641          * @return FileRepoStatus object.
1642          */
1643         function move( $target ) {
1644                 $this->readOnlyError();
1645         }
1646
1647         /**
1648          * Delete all versions of the file.
1649          *
1650          * Moves the files into an archive directory (or deletes them)
1651          * and removes the database rows.
1652          *
1653          * Cache purging is done; logging is caller's responsibility.
1654          *
1655          * @param string $reason
1656          * @param bool $suppress Hide content from sysops?
1657          * @return bool on success, false on some kind of failure
1658          * STUB
1659          * Overridden by LocalFile
1660          */
1661         function delete( $reason, $suppress = false ) {
1662                 $this->readOnlyError();
1663         }
1664
1665         /**
1666          * Restore all or specified deleted revisions to the given file.
1667          * Permissions and logging are left to the caller.
1668          *
1669          * May throw database exceptions on error.
1670          *
1671          * @param array $versions set of record ids of deleted items to restore,
1672          *   or empty to restore all revisions.
1673          * @param bool $unsuppress remove restrictions on content upon restoration?
1674          * @return int|bool the number of file revisions restored if successful,
1675          *   or false on failure
1676          * STUB
1677          * Overridden by LocalFile
1678          */
1679         function restore( $versions = array(), $unsuppress = false ) {
1680                 $this->readOnlyError();
1681         }
1682
1683         /**
1684          * Returns 'true' if this file is a type which supports multiple pages,
1685          * e.g. DJVU or PDF. Note that this may be true even if the file in
1686          * question only has a single page.
1687          *
1688          * @return bool
1689          */
1690         function isMultipage() {
1691                 return $this->getHandler() && $this->handler->isMultiPage( $this );
1692         }
1693
1694         /**
1695          * Returns the number of pages of a multipage document, or false for
1696          * documents which aren't multipage documents
1697          *
1698          * @return bool|int
1699          */
1700         function pageCount() {
1701                 if ( !isset( $this->pageCount ) ) {
1702                         if ( $this->getHandler() && $this->handler->isMultiPage( $this ) ) {
1703                                 $this->pageCount = $this->handler->pageCount( $this );
1704                         } else {
1705                                 $this->pageCount = false;
1706                         }
1707                 }
1708
1709                 return $this->pageCount;
1710         }
1711
1712         /**
1713          * Calculate the height of a thumbnail using the source and destination width
1714          *
1715          * @param int $srcWidth
1716          * @param int $srcHeight
1717          * @param int $dstWidth
1718          *
1719          * @return int
1720          */
1721         static function scaleHeight( $srcWidth, $srcHeight, $dstWidth ) {
1722                 // Exact integer multiply followed by division
1723                 if ( $srcWidth == 0 ) {
1724                         return 0;
1725                 } else {
1726                         return round( $srcHeight * $dstWidth / $srcWidth );
1727                 }
1728         }
1729
1730         /**
1731          * Get an image size array like that returned by getImageSize(), or false if it
1732          * can't be determined.
1733          *
1734          * @param string $fileName The filename
1735          * @return array
1736          */
1737         function getImageSize( $fileName ) {
1738                 if ( !$this->getHandler() ) {
1739                         return false;
1740                 }
1741
1742                 return $this->handler->getImageSize( $this, $fileName );
1743         }
1744
1745         /**
1746          * Get the URL of the image description page. May return false if it is
1747          * unknown or not applicable.
1748          *
1749          * @return string
1750          */
1751         function getDescriptionUrl() {
1752                 if ( $this->repo ) {
1753                         return $this->repo->getDescriptionUrl( $this->getName() );
1754                 } else {
1755                         return false;
1756                 }
1757         }
1758
1759         /**
1760          * Get the HTML text of the description page, if available
1761          *
1762          * @param bool|Language $lang Optional language to fetch description in
1763          * @return string
1764          */
1765         function getDescriptionText( $lang = false ) {
1766                 global $wgMemc, $wgLang;
1767                 if ( !$this->repo || !$this->repo->fetchDescription ) {
1768                         return false;
1769                 }
1770                 if ( !$lang ) {
1771                         $lang = $wgLang;
1772                 }
1773                 $renderUrl = $this->repo->getDescriptionRenderUrl( $this->getName(), $lang->getCode() );
1774                 if ( $renderUrl ) {
1775                         if ( $this->repo->descriptionCacheExpiry > 0 ) {
1776                                 wfDebug( "Attempting to get the description from cache..." );
1777                                 $key = $this->repo->getLocalCacheKey(
1778                                         'RemoteFileDescription',
1779                                         'url',
1780                                         $lang->getCode(),
1781                                         $this->getName()
1782                                 );
1783                                 $obj = $wgMemc->get( $key );
1784                                 if ( $obj ) {
1785                                         wfDebug( "success!\n" );
1786
1787                                         return $obj;
1788                                 }
1789                                 wfDebug( "miss\n" );
1790                         }
1791                         wfDebug( "Fetching shared description from $renderUrl\n" );
1792                         $res = Http::get( $renderUrl );
1793                         if ( $res && $this->repo->descriptionCacheExpiry > 0 ) {
1794                                 $wgMemc->set( $key, $res, $this->repo->descriptionCacheExpiry );
1795                         }
1796
1797                         return $res;
1798                 } else {
1799                         return false;
1800                 }
1801         }
1802
1803         /**
1804          * Get description of file revision
1805          * STUB
1806          *
1807          * @param int $audience One of:
1808          *   File::FOR_PUBLIC       to be displayed to all users
1809          *   File::FOR_THIS_USER    to be displayed to the given user
1810          *   File::RAW              get the description regardless of permissions
1811          * @param User $user User object to check for, only if FOR_THIS_USER is
1812          *   passed to the $audience parameter
1813          * @return string
1814          */
1815         function getDescription( $audience = self::FOR_PUBLIC, User $user = null ) {
1816                 return null;
1817         }
1818
1819         /**
1820          * Get the 14-character timestamp of the file upload
1821          *
1822          * @return string|bool TS_MW timestamp or false on failure
1823          */
1824         function getTimestamp() {
1825                 $this->assertRepoDefined();
1826
1827                 return $this->repo->getFileTimestamp( $this->getPath() );
1828         }
1829
1830         /**
1831          * Get the SHA-1 base 36 hash of the file
1832          *
1833          * @return string
1834          */
1835         function getSha1() {
1836                 $this->assertRepoDefined();
1837
1838                 return $this->repo->getFileSha1( $this->getPath() );
1839         }
1840
1841         /**
1842          * Get the deletion archive key, "<sha1>.<ext>"
1843          *
1844          * @return string
1845          */
1846         function getStorageKey() {
1847                 $hash = $this->getSha1();
1848                 if ( !$hash ) {
1849                         return false;
1850                 }
1851                 $ext = $this->getExtension();
1852                 $dotExt = $ext === '' ? '' : ".$ext";
1853
1854                 return $hash . $dotExt;
1855         }
1856
1857         /**
1858          * Determine if the current user is allowed to view a particular
1859          * field of this file, if it's marked as deleted.
1860          * STUB
1861          * @param int $field
1862          * @param User $user User object to check, or null to use $wgUser
1863          * @return bool
1864          */
1865         function userCan( $field, User $user = null ) {
1866                 return true;
1867         }
1868
1869         /**
1870          * Get an associative array containing information about a file in the local filesystem.
1871          *
1872          * @param string $path absolute local filesystem path
1873          * @param string|bool $ext The file extension, or true to extract it from
1874          *   the filename. Set it to false to ignore the extension.
1875          *
1876          * @return array
1877          * @deprecated since 1.19
1878          */
1879         static function getPropsFromPath( $path, $ext = true ) {
1880                 wfDebug( __METHOD__ . ": Getting file info for $path\n" );
1881                 wfDeprecated( __METHOD__, '1.19' );
1882
1883                 $fsFile = new FSFile( $path );
1884
1885                 return $fsFile->getProps();
1886         }
1887
1888         /**
1889          * Get a SHA-1 hash of a file in the local filesystem, in base-36 lower case
1890          * encoding, zero padded to 31 digits.
1891          *
1892          * 160 log 2 / log 36 = 30.95, so the 160-bit hash fills 31 digits in base 36
1893          * fairly neatly.
1894          *
1895          * @param $path string
1896          * @return bool|string False on failure
1897          * @deprecated since 1.19
1898          */
1899         static function sha1Base36( $path ) {
1900                 wfDeprecated( __METHOD__, '1.19' );
1901
1902                 $fsFile = new FSFile( $path );
1903
1904                 return $fsFile->getSha1Base36();
1905         }
1906
1907         /**
1908          * @return array HTTP header name/value map to use for HEAD/GET request responses
1909          */
1910         function getStreamHeaders() {
1911                 $handler = $this->getHandler();
1912                 if ( $handler ) {
1913                         return $handler->getStreamHeaders( $this->getMetadata() );
1914                 } else {
1915                         return array();
1916                 }
1917         }
1918
1919         /**
1920          * @return string
1921          */
1922         function getLongDesc() {
1923                 $handler = $this->getHandler();
1924                 if ( $handler ) {
1925                         return $handler->getLongDesc( $this );
1926                 } else {
1927                         return MediaHandler::getGeneralLongDesc( $this );
1928                 }
1929         }
1930
1931         /**
1932          * @return string
1933          */
1934         function getShortDesc() {
1935                 $handler = $this->getHandler();
1936                 if ( $handler ) {
1937                         return $handler->getShortDesc( $this );
1938                 } else {
1939                         return MediaHandler::getGeneralShortDesc( $this );
1940                 }
1941         }
1942
1943         /**
1944          * @return string
1945          */
1946         function getDimensionsString() {
1947                 $handler = $this->getHandler();
1948                 if ( $handler ) {
1949                         return $handler->getDimensionsString( $this );
1950                 } else {
1951                         return '';
1952                 }
1953         }
1954
1955         /**
1956          * @return string
1957          */
1958         function getRedirected() {
1959                 return $this->redirected;
1960         }
1961
1962         /**
1963          * @return Title|null
1964          */
1965         function getRedirectedTitle() {
1966                 if ( $this->redirected ) {
1967                         if ( !$this->redirectTitle ) {
1968                                 $this->redirectTitle = Title::makeTitle( NS_FILE, $this->redirected );
1969                         }
1970
1971                         return $this->redirectTitle;
1972                 }
1973
1974                 return null;
1975         }
1976
1977         /**
1978          * @param string $from
1979          * @return void
1980          */
1981         function redirectedFrom( $from ) {
1982                 $this->redirected = $from;
1983         }
1984
1985         /**
1986          * @return bool
1987          */
1988         function isMissing() {
1989                 return false;
1990         }
1991
1992         /**
1993          * Check if this file object is small and can be cached
1994          * @return bool
1995          */
1996         public function isCacheable() {
1997                 return true;
1998         }
1999
2000         /**
2001          * Assert that $this->repo is set to a valid FileRepo instance
2002          * @throws MWException
2003          */
2004         protected function assertRepoDefined() {
2005                 if ( !( $this->repo instanceof $this->repoClass ) ) {
2006                         throw new MWException( "A {$this->repoClass} object is not set for this File.\n" );
2007                 }
2008         }
2009
2010         /**
2011          * Assert that $this->title is set to a Title
2012          * @throws MWException
2013          */
2014         protected function assertTitleDefined() {
2015                 if ( !( $this->title instanceof Title ) ) {
2016                         throw new MWException( "A Title object is not set for this File.\n" );
2017                 }
2018         }
2019 }