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 implements IDBAccessObject {
  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 Whether the output of transform() for this file is likely to be valid. */
 142         protected $canRender;
 143
 144         /** @var bool Whether 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         /** @var array Cache of tmp filepaths pointing to generated bucket thumbnails, keyed by width */
 153         protected $tmpBucketedThumbCache = [];
 154
 155         /**
 156          * Call this constructor from child classes.
 157          *
 158          * Both $title and $repo are optional, though some functions
 159          * may return false or throw exceptions if they are not set.
 160          * Most subclasses will want to call assertRepoDefined() here.
 161          *
 162          * @param Title|string|bool $title
 163          * @param FileRepo|bool $repo
 164          */
 165         function __construct( $title, $repo ) {
 166                 // Some subclasses do not use $title, but set name/title some other way
 167                 if ( $title !== false ) {
 168                         $title = self::normalizeTitle( $title, 'exception' );
 169                 }
 170                 $this->title = $title;
 171                 $this->repo = $repo;
 172         }
 173
 174         /**
 175          * Given a string or Title object return either a
 176          * valid Title object with namespace NS_FILE or null
 177          *
 178          * @param Title|string $title
 179          * @param string|bool $exception Use 'exception' to throw an error on bad titles
 180          * @throws MWException
 181          * @return Title|null
 182          */
 183         static function normalizeTitle( $title, $exception = false ) {
 184                 $ret = $title;
 185                 if ( $ret instanceof Title ) {
 186                         # Normalize NS_MEDIA -> NS_FILE
 187                         if ( $ret->getNamespace() == NS_MEDIA ) {
 188                                 $ret = Title::makeTitleSafe( NS_FILE, $ret->getDBkey() );
 189                         # Sanity check the title namespace
 190                         } elseif ( $ret->getNamespace() !== NS_FILE ) {
 191                                 $ret = null;
 192                         }
 193                 } else {
 194                         # Convert strings to Title objects
 195                         $ret = Title::makeTitleSafe( NS_FILE, (string)$ret );
 196                 }
 197                 if ( !$ret && $exception !== false ) {
 198                         throw new MWException( "`$title` is not a valid file title." );
 199                 }
 200
 201                 return $ret;
 202         }
 203
 204         function __get( $name ) {
 205                 $function = [ $this, 'get' . ucfirst( $name ) ];
 206                 if ( !is_callable( $function ) ) {
 207                         return null;
 208                 } else {
 209                         $this->$name = call_user_func( $function );
 210
 211                         return $this->$name;
 212                 }
 213         }
 214
 215         /**
 216          * Normalize a file extension to the common form, making it lowercase and checking some synonyms,
 217          * and ensure it's clean. Extensions with non-alphanumeric characters will be discarded.
 218          * Keep in sync with mw.Title.normalizeExtension() in JS.
 219          *
 220          * @param string $extension File extension (without the leading dot)
 221          * @return string File extension in canonical form
 222          */
 223         static function normalizeExtension( $extension ) {
 224                 $lower = strtolower( $extension );
 225                 $squish = [
 226                         'htm' => 'html',
 227                         'jpeg' => 'jpg',
 228                         'mpeg' => 'mpg',
 229                         'tiff' => 'tif',
 230                         'ogv' => 'ogg' ];
 231                 if ( isset( $squish[$lower] ) ) {
 232                         return $squish[$lower];
 233                 } elseif ( preg_match( '/^[0-9a-z]+$/', $lower ) ) {
 234                         return $lower;
 235                 } else {
 236                         return '';
 237                 }
 238         }
 239
 240         /**
 241          * Checks if file extensions are compatible
 242          *
 243          * @param File $old Old file
 244          * @param string $new New name
 245          *
 246          * @return bool|null
 247          */
 248         static function checkExtensionCompatibility( File $old, $new ) {
 249                 $oldMime = $old->getMimeType();
 250                 $n = strrpos( $new, '.' );
 251                 $newExt = self::normalizeExtension( $n ? substr( $new, $n + 1 ) : '' );
 252                 $mimeMagic = MimeMagic::singleton();
 253
 254                 return $mimeMagic->isMatchingExtension( $newExt, $oldMime );
 255         }
 256
 257         /**
 258          * Upgrade the database row if there is one
 259          * Called by ImagePage
 260          * STUB
 261          */
 262         function upgradeRow() {
 263         }
 264
 265         /**
 266          * Split an internet media type into its two components; if not
 267          * a two-part name, set the minor type to 'unknown'.
 268          *
 269          * @param string $mime "text/html" etc
 270          * @return array ("text", "html") etc
 271          */
 272         public static function splitMime( $mime ) {
 273                 if ( strpos( $mime, '/' ) !== false ) {
 274                         return explode( '/', $mime, 2 );
 275                 } else {
 276                         return [ $mime, 'unknown' ];
 277                 }
 278         }
 279
 280         /**
 281          * Callback for usort() to do file sorts by name
 282          *
 283          * @param File $a
 284          * @param File $b
 285          * @return int Result of name comparison
 286          */
 287         public static function compare( File $a, File $b ) {
 288                 return strcmp( $a->getName(), $b->getName() );
 289         }
 290
 291         /**
 292          * Return the name of this file
 293          *
 294          * @return string
 295          */
 296         public function getName() {
 297                 if ( !isset( $this->name ) ) {
 298                         $this->assertRepoDefined();
 299                         $this->name = $this->repo->getNameFromTitle( $this->title );
 300                 }
 301
 302                 return $this->name;
 303         }
 304
 305         /**
 306          * Get the file extension, e.g. "svg"
 307          *
 308          * @return string
 309          */
 310         function getExtension() {
 311                 if ( !isset( $this->extension ) ) {
 312                         $n = strrpos( $this->getName(), '.' );
 313                         $this->extension = self::normalizeExtension(
 314                                 $n ? substr( $this->getName(), $n + 1 ) : '' );
 315                 }
 316
 317                 return $this->extension;
 318         }
 319
 320         /**
 321          * Return the associated title object
 322          *
 323          * @return Title
 324          */
 325         public function getTitle() {
 326                 return $this->title;
 327         }
 328
 329         /**
 330          * Return the title used to find this file
 331          *
 332          * @return Title
 333          */
 334         public function getOriginalTitle() {
 335                 if ( $this->redirected ) {
 336                         return $this->getRedirectedTitle();
 337                 }
 338
 339                 return $this->title;
 340         }
 341
 342         /**
 343          * Return the URL of the file
 344          *
 345          * @return string
 346          */
 347         public function getUrl() {
 348                 if ( !isset( $this->url ) ) {
 349                         $this->assertRepoDefined();
 350                         $ext = $this->getExtension();
 351                         $this->url = $this->repo->getZoneUrl( 'public', $ext ) . '/' . $this->getUrlRel();
 352                 }
 353
 354                 return $this->url;
 355         }
 356
 357         /*
 358          * Get short description URL for a files based on the page ID
 359          *
 360          * @return string|null
 361          * @since 1.27
 362          */
 363         public function getDescriptionShortUrl() {
 364                 return null;
 365         }
 366
 367         /**
 368          * Return a fully-qualified URL to the file.
 369          * Upload URL paths _may or may not_ be fully qualified, so
 370          * we check. Local paths are assumed to belong on $wgServer.
 371          *
 372          * @return string
 373          */
 374         public function getFullUrl() {
 375                 return wfExpandUrl( $this->getUrl(), PROTO_RELATIVE );
 376         }
 377
 378         /**
 379          * @return string
 380          */
 381         public function getCanonicalUrl() {
 382                 return wfExpandUrl( $this->getUrl(), PROTO_CANONICAL );
 383         }
 384
 385         /**
 386          * @return string
 387          */
 388         function getViewURL() {
 389                 if ( $this->mustRender() ) {
 390                         if ( $this->canRender() ) {
 391                                 return $this->createThumb( $this->getWidth() );
 392                         } else {
 393                                 wfDebug( __METHOD__ . ': supposed to render ' . $this->getName() .
 394                                         ' (' . $this->getMimeType() . "), but can't!\n" );
 395
 396                                 return $this->getURL(); # hm... return NULL?
 397                         }
 398                 } else {
 399                         return $this->getURL();
 400                 }
 401         }
 402
 403         /**
 404          * Return the storage path to the file. Note that this does
 405          * not mean that a file actually exists under that location.
 406          *
 407          * This path depends on whether directory hashing is active or not,
 408          * i.e. whether the files are all found in the same directory,
 409          * or in hashed paths like /images/3/3c.
 410          *
 411          * Most callers don't check the return value, but ForeignAPIFile::getPath
 412          * returns false.
 413          *
 414          * @return string|bool ForeignAPIFile::getPath can return false
 415          */
 416         public function getPath() {
 417                 if ( !isset( $this->path ) ) {
 418                         $this->assertRepoDefined();
 419                         $this->path = $this->repo->getZonePath( 'public' ) . '/' . $this->getRel();
 420                 }
 421
 422                 return $this->path;
 423         }
 424
 425         /**
 426          * Get an FS copy or original of this file and return the path.
 427          * Returns false on failure. Callers must not alter the file.
 428          * Temporary files are cleared automatically.
 429          *
 430          * @return string|bool False on failure
 431          */
 432         public function getLocalRefPath() {
 433                 $this->assertRepoDefined();
 434                 if ( !isset( $this->fsFile ) ) {
 435                         $starttime = microtime( true );
 436                         $this->fsFile = $this->repo->getLocalReference( $this->getPath() );
 437
 438                         $statTiming = microtime( true ) - $starttime;
 439                         RequestContext::getMain()->getStats()->timing(
 440                                 'media.thumbnail.generate.fetchoriginal', 1000 * $statTiming );
 441
 442                         if ( !$this->fsFile ) {
 443                                 $this->fsFile = false; // null => false; cache negative hits
 444                         }
 445                 }
 446
 447                 return ( $this->fsFile )
 448                         ? $this->fsFile->getPath()
 449                         : false;
 450         }
 451
 452         /**
 453          * Return the width of the image. Returns false if the width is unknown
 454          * or undefined.
 455          *
 456          * STUB
 457          * Overridden by LocalFile, UnregisteredLocalFile
 458          *
 459          * @param int $page
 460          * @return int|bool
 461          */
 462         public function getWidth( $page = 1 ) {
 463                 return false;
 464         }
 465
 466         /**
 467          * Return the height of the image. Returns false if the height is unknown
 468          * or undefined
 469          *
 470          * STUB
 471          * Overridden by LocalFile, UnregisteredLocalFile
 472          *
 473          * @param int $page
 474          * @return bool|int False on failure
 475          */
 476         public function getHeight( $page = 1 ) {
 477                 return false;
 478         }
 479
 480         /**
 481          * Return the smallest bucket from $wgThumbnailBuckets which is at least
 482          * $wgThumbnailMinimumBucketDistance larger than $desiredWidth. The returned bucket, if any,
 483          * will always be bigger than $desiredWidth.
 484          *
 485          * @param int $desiredWidth
 486          * @param int $page
 487          * @return bool|int
 488          */
 489         public function getThumbnailBucket( $desiredWidth, $page = 1 ) {
 490                 global $wgThumbnailBuckets, $wgThumbnailMinimumBucketDistance;
 491
 492                 $imageWidth = $this->getWidth( $page );
 493
 494                 if ( $imageWidth === false ) {
 495                         return false;
 496                 }
 497
 498                 if ( $desiredWidth > $imageWidth ) {
 499                         return false;
 500                 }
 501
 502                 if ( !$wgThumbnailBuckets ) {
 503                         return false;
 504                 }
 505
 506                 $sortedBuckets = $wgThumbnailBuckets;
 507
 508                 sort( $sortedBuckets );
 509
 510                 foreach ( $sortedBuckets as $bucket ) {
 511                         if ( $bucket >= $imageWidth ) {
 512                                 return false;
 513                         }
 514
 515                         if ( $bucket - $wgThumbnailMinimumBucketDistance > $desiredWidth ) {
 516                                 return $bucket;
 517                         }
 518                 }
 519
 520                 // Image is bigger than any available bucket
 521                 return false;
 522         }
 523
 524         /**
 525          * Returns ID or name of user who uploaded the file
 526          * STUB
 527          *
 528          * @param string $type 'text' or 'id'
 529          * @return string|int
 530          */
 531         public function getUser( $type = 'text' ) {
 532                 return null;
 533         }
 534
 535         /**
 536          * Get the duration of a media file in seconds
 537          *
 538          * @return int
 539          */
 540         public function getLength() {
 541                 $handler = $this->getHandler();
 542                 if ( $handler ) {
 543                         return $handler->getLength( $this );
 544                 } else {
 545                         return 0;
 546                 }
 547         }
 548
 549         /**
 550          * Return true if the file is vectorized
 551          *
 552          * @return bool
 553          */
 554         public function isVectorized() {
 555                 $handler = $this->getHandler();
 556                 if ( $handler ) {
 557                         return $handler->isVectorized( $this );
 558                 } else {
 559                         return false;
 560                 }
 561         }
 562
 563         /**
 564          * Gives a (possibly empty) list of languages to render
 565          * the file in.
 566          *
 567          * If the file doesn't have translations, or if the file
 568          * format does not support that sort of thing, returns
 569          * an empty array.
 570          *
 571          * @return array
 572          * @since 1.23
 573          */
 574         public function getAvailableLanguages() {
 575                 $handler = $this->getHandler();
 576                 if ( $handler ) {
 577                         return $handler->getAvailableLanguages( $this );
 578                 } else {
 579                         return [];
 580                 }
 581         }
 582
 583         /**
 584          * In files that support multiple language, what is the default language
 585          * to use if none specified.
 586          *
 587          * @return string|null Lang code, or null if filetype doesn't support multiple languages.
 588          * @since 1.23
 589          */
 590         public function getDefaultRenderLanguage() {
 591                 $handler = $this->getHandler();
 592                 if ( $handler ) {
 593                         return $handler->getDefaultRenderLanguage( $this );
 594                 } else {
 595                         return null;
 596                 }
 597         }
 598
 599         /**
 600          * Will the thumbnail be animated if one would expect it to be.
 601          *
 602          * Currently used to add a warning to the image description page
 603          *
 604          * @return bool False if the main image is both animated
 605          *   and the thumbnail is not. In all other cases must return
 606          *   true. If image is not renderable whatsoever, should
 607          *   return true.
 608          */
 609         public function canAnimateThumbIfAppropriate() {
 610                 $handler = $this->getHandler();
 611                 if ( !$handler ) {
 612                         // We cannot handle image whatsoever, thus
 613                         // one would not expect it to be animated
 614                         // so true.
 615                         return true;
 616                 } else {
 617                         if ( $this->allowInlineDisplay()
 618                                 && $handler->isAnimatedImage( $this )
 619                                 && !$handler->canAnimateThumbnail( $this )
 620                         ) {
 621                                 // Image is animated, but thumbnail isn't.
 622                                 // This is unexpected to the user.
 623                                 return false;
 624                         } else {
 625                                 // Image is not animated, so one would
 626                                 // not expect thumb to be
 627                                 return true;
 628                         }
 629                 }
 630         }
 631
 632         /**
 633          * Get handler-specific metadata
 634          * Overridden by LocalFile, UnregisteredLocalFile
 635          * STUB
 636          * @return bool|array
 637          */
 638         public function getMetadata() {
 639                 return false;
 640         }
 641
 642         /**
 643          * Like getMetadata but returns a handler independent array of common values.
 644          * @see MediaHandler::getCommonMetaArray()
 645          * @return array|bool Array or false if not supported
 646          * @since 1.23
 647          */
 648         public function getCommonMetaArray() {
 649                 $handler = $this->getHandler();
 650
 651                 if ( !$handler ) {
 652                         return false;
 653                 }
 654
 655                 return $handler->getCommonMetaArray( $this );
 656         }
 657
 658         /**
 659          * get versioned metadata
 660          *
 661          * @param array|string $metadata Array or string of (serialized) metadata
 662          * @param int $version Version number.
 663          * @return array Array containing metadata, or what was passed to it on fail
 664          *   (unserializing if not array)
 665          */
 666         public function convertMetadataVersion( $metadata, $version ) {
 667                 $handler = $this->getHandler();
 668                 if ( !is_array( $metadata ) ) {
 669                         // Just to make the return type consistent
 670                         $metadata = unserialize( $metadata );
 671                 }
 672                 if ( $handler ) {
 673                         return $handler->convertMetadataVersion( $metadata, $version );
 674                 } else {
 675                         return $metadata;
 676                 }
 677         }
 678
 679         /**
 680          * Return the bit depth of the file
 681          * Overridden by LocalFile
 682          * STUB
 683          * @return int
 684          */
 685         public function getBitDepth() {
 686                 return 0;
 687         }
 688
 689         /**
 690          * Return the size of the image file, in bytes
 691          * Overridden by LocalFile, UnregisteredLocalFile
 692          * STUB
 693          * @return bool
 694          */
 695         public function getSize() {
 696                 return false;
 697         }
 698
 699         /**
 700          * Returns the MIME type of the file.
 701          * Overridden by LocalFile, UnregisteredLocalFile
 702          * STUB
 703          *
 704          * @return string
 705          */
 706         function getMimeType() {
 707                 return 'unknown/unknown';
 708         }
 709
 710         /**
 711          * Return the type of the media in the file.
 712          * Use the value returned by this function with the MEDIATYPE_xxx constants.
 713          * Overridden by LocalFile,
 714          * STUB
 715          * @return string
 716          */
 717         function getMediaType() {
 718                 return MEDIATYPE_UNKNOWN;
 719         }
 720
 721         /**
 722          * Checks if the output of transform() for this file is likely
 723          * to be valid. If this is false, various user elements will
 724          * display a placeholder instead.
 725          *
 726          * Currently, this checks if the file is an image format
 727          * that can be converted to a format
 728          * supported by all browsers (namely GIF, PNG and JPEG),
 729          * or if it is an SVG image and SVG conversion is enabled.
 730          *
 731          * @return bool
 732          */
 733         function canRender() {
 734                 if ( !isset( $this->canRender ) ) {
 735                         $this->canRender = $this->getHandler() && $this->handler->canRender( $this ) && $this->exists();
 736                 }
 737
 738                 return $this->canRender;
 739         }
 740
 741         /**
 742          * Accessor for __get()
 743          * @return bool
 744          */
 745         protected function getCanRender() {
 746                 return $this->canRender();
 747         }
 748
 749         /**
 750          * Return true if the file is of a type that can't be directly
 751          * rendered by typical browsers and needs to be re-rasterized.
 752          *
 753          * This returns true for everything but the bitmap types
 754          * supported by all browsers, i.e. JPEG; GIF and PNG. It will
 755          * also return true for any non-image formats.
 756          *
 757          * @return bool
 758          */
 759         function mustRender() {
 760                 return $this->getHandler() && $this->handler->mustRender( $this );
 761         }
 762
 763         /**
 764          * Alias for canRender()
 765          *
 766          * @return bool
 767          */
 768         function allowInlineDisplay() {
 769                 return $this->canRender();
 770         }
 771
 772         /**
 773          * Determines if this media file is in a format that is unlikely to
 774          * contain viruses or malicious content. It uses the global
 775          * $wgTrustedMediaFormats list to determine if the file is safe.
 776          *
 777          * This is used to show a warning on the description page of non-safe files.
 778          * It may also be used to disallow direct [[media:...]] links to such files.
 779          *
 780          * Note that this function will always return true if allowInlineDisplay()
 781          * or isTrustedFile() is true for this file.
 782          *
 783          * @return bool
 784          */
 785         function isSafeFile() {
 786                 if ( !isset( $this->isSafeFile ) ) {
 787                         $this->isSafeFile = $this->getIsSafeFileUncached();
 788                 }
 789
 790                 return $this->isSafeFile;
 791         }
 792
 793         /**
 794          * Accessor for __get()
 795          *
 796          * @return bool
 797          */
 798         protected function getIsSafeFile() {
 799                 return $this->isSafeFile();
 800         }
 801
 802         /**
 803          * Uncached accessor
 804          *
 805          * @return bool
 806          */
 807         protected function getIsSafeFileUncached() {
 808                 global $wgTrustedMediaFormats;
 809
 810                 if ( $this->allowInlineDisplay() ) {
 811                         return true;
 812                 }
 813                 if ( $this->isTrustedFile() ) {
 814                         return true;
 815                 }
 816
 817                 $type = $this->getMediaType();
 818                 $mime = $this->getMimeType();
 819                 # wfDebug( "LocalFile::isSafeFile: type= $type, mime= $mime\n" );
 820
 821                 if ( !$type || $type === MEDIATYPE_UNKNOWN ) {
 822                         return false; # unknown type, not trusted
 823                 }
 824                 if ( in_array( $type, $wgTrustedMediaFormats ) ) {
 825                         return true;
 826                 }
 827
 828                 if ( $mime === "unknown/unknown" ) {
 829                         return false; # unknown type, not trusted
 830                 }
 831                 if ( in_array( $mime, $wgTrustedMediaFormats ) ) {
 832                         return true;
 833                 }
 834
 835                 return false;
 836         }
 837
 838         /**
 839          * Returns true if the file is flagged as trusted. Files flagged that way
 840          * can be linked to directly, even if that is not allowed for this type of
 841          * file normally.
 842          *
 843          * This is a dummy function right now and always returns false. It could be
 844          * implemented to extract a flag from the database. The trusted flag could be
 845          * set on upload, if the user has sufficient privileges, to bypass script-
 846          * and html-filters. It may even be coupled with cryptographics signatures
 847          * or such.
 848          *
 849          * @return bool
 850          */
 851         function isTrustedFile() {
 852                 # this could be implemented to check a flag in the database,
 853                 # look for signatures, etc
 854                 return false;
 855         }
 856
 857         /**
 858          * Load any lazy-loaded file object fields from source
 859          *
 860          * This is only useful when setting $flags
 861          *
 862          * Overridden by LocalFile to actually query the DB
 863          *
 864          * @param integer $flags Bitfield of File::READ_* constants
 865          */
 866         public function load( $flags = 0 ) {
 867         }
 868
 869         /**
 870          * Returns true if file exists in the repository.
 871          *
 872          * Overridden by LocalFile to avoid unnecessary stat calls.
 873          *
 874          * @return bool Whether file exists in the repository.
 875          */
 876         public function exists() {
 877                 return $this->getPath() && $this->repo->fileExists( $this->path );
 878         }
 879
 880         /**
 881          * Returns true if file exists in the repository and can be included in a page.
 882          * It would be unsafe to include private images, making public thumbnails inadvertently
 883          *
 884          * @return bool Whether file exists in the repository and is includable.
 885          */
 886         public function isVisible() {
 887                 return $this->exists();
 888         }
 889
 890         /**
 891          * @return string
 892          */
 893         function getTransformScript() {
 894                 if ( !isset( $this->transformScript ) ) {
 895                         $this->transformScript = false;
 896                         if ( $this->repo ) {
 897                                 $script = $this->repo->getThumbScriptUrl();
 898                                 if ( $script ) {
 899                                         $this->transformScript = wfAppendQuery( $script, [ 'f' => $this->getName() ] );
 900                                 }
 901                         }
 902                 }
 903
 904                 return $this->transformScript;
 905         }
 906
 907         /**
 908          * Get a ThumbnailImage which is the same size as the source
 909          *
 910          * @param array $handlerParams
 911          *
 912          * @return string
 913          */
 914         function getUnscaledThumb( $handlerParams = [] ) {
 915                 $hp =& $handlerParams;
 916                 $page = isset( $hp['page'] ) ? $hp['page'] : false;
 917                 $width = $this->getWidth( $page );
 918                 if ( !$width ) {
 919                         return $this->iconThumb();
 920                 }
 921                 $hp['width'] = $width;
 922                 // be sure to ignore any height specification as well (bug 62258)
 923                 unset( $hp['height'] );
 924
 925                 return $this->transform( $hp );
 926         }
 927
 928         /**
 929          * Return the file name of a thumbnail with the specified parameters.
 930          * Use File::THUMB_FULL_NAME to always get a name like "<params>-<source>".
 931          * Otherwise, the format may be "<params>-<source>" or "<params>-thumbnail.<ext>".
 932          *
 933          * @param array $params Handler-specific parameters
 934          * @param int $flags Bitfield that supports THUMB_* constants
 935          * @return string|null
 936          */
 937         public function thumbName( $params, $flags = 0 ) {
 938                 $name = ( $this->repo && !( $flags & self::THUMB_FULL_NAME ) )
 939                         ? $this->repo->nameForThumb( $this->getName() )
 940                         : $this->getName();
 941
 942                 return $this->generateThumbName( $name, $params );
 943         }
 944
 945         /**
 946          * Generate a thumbnail file name from a name and specified parameters
 947          *
 948          * @param string $name
 949          * @param array $params Parameters which will be passed to MediaHandler::makeParamString
 950          * @return string|null
 951          */
 952         public function generateThumbName( $name, $params ) {
 953                 if ( !$this->getHandler() ) {
 954                         return null;
 955                 }
 956                 $extension = $this->getExtension();
 957                 list( $thumbExt, ) = $this->getHandler()->getThumbType(
 958                         $extension, $this->getMimeType(), $params );
 959                 $thumbName = $this->getHandler()->makeParamString( $params );
 960
 961                 if ( $this->repo->supportsSha1URLs() ) {
 962                         $thumbName .= '-' . $this->getSha1() . '.' . $thumbExt;
 963                 } else {
 964                         $thumbName .= '-' . $name;
 965
 966                         if ( $thumbExt != $extension ) {
 967                                 $thumbName .= ".$thumbExt";
 968                         }
 969                 }
 970
 971                 return $thumbName;
 972         }
 973
 974         /**
 975          * Create a thumbnail of the image having the specified width/height.
 976          * The thumbnail will not be created if the width is larger than the
 977          * image's width. Let the browser do the scaling in this case.
 978          * The thumbnail is stored on disk and is only computed if the thumbnail
 979          * file does not exist OR if it is older than the image.
 980          * Returns the URL.
 981          *
 982          * Keeps aspect ratio of original image. If both width and height are
 983          * specified, the generated image will be no bigger than width x height,
 984          * and will also have correct aspect ratio.
 985          *
 986          * @param int $width Maximum width of the generated thumbnail
 987          * @param int $height Maximum height of the image (optional)
 988          *
 989          * @return string
 990          */
 991         public function createThumb( $width, $height = -1 ) {
 992                 $params = [ 'width' => $width ];
 993                 if ( $height != -1 ) {
 994                         $params['height'] = $height;
 995                 }
 996                 $thumb = $this->transform( $params );
 997                 if ( !$thumb || $thumb->isError() ) {
 998                         return '';
 999                 }
1000
1001                 return $thumb->getUrl();
1002         }
1003
1004         /**
1005          * Return either a MediaTransformError or placeholder thumbnail (if $wgIgnoreImageErrors)
1006          *
1007          * @param string $thumbPath Thumbnail storage path
1008          * @param string $thumbUrl Thumbnail URL
1009          * @param array $params
1010          * @param int $flags
1011          * @return MediaTransformOutput
1012          */
1013         protected function transformErrorOutput( $thumbPath, $thumbUrl, $params, $flags ) {
1014                 global $wgIgnoreImageErrors;
1015
1016                 $handler = $this->getHandler();
1017                 if ( $handler && $wgIgnoreImageErrors && !( $flags & self::RENDER_NOW ) ) {
1018                         return $handler->getTransform( $this, $thumbPath, $thumbUrl, $params );
1019                 } else {
1020                         return new MediaTransformError( 'thumbnail_error',
1021                                 $params['width'], 0, wfMessage( 'thumbnail-dest-create' )->text() );
1022                 }
1023         }
1024
1025         /**
1026          * Transform a media file
1027          *
1028          * @param array $params An associative array of handler-specific parameters.
1029          *   Typical keys are width, height and page.
1030          * @param int $flags A bitfield, may contain self::RENDER_NOW to force rendering
1031          * @return MediaTransformOutput|bool False on failure
1032          */
1033         function transform( $params, $flags = 0 ) {
1034                 global $wgThumbnailEpoch;
1035
1036                 do {
1037                         if ( !$this->canRender() ) {
1038                                 $thumb = $this->iconThumb();
1039                                 break; // not a bitmap or renderable image, don't try
1040                         }
1041
1042                         // Get the descriptionUrl to embed it as comment into the thumbnail. Bug 19791.
1043                         $descriptionUrl = $this->getDescriptionUrl();
1044                         if ( $descriptionUrl ) {
1045                                 $params['descriptionUrl'] = wfExpandUrl( $descriptionUrl, PROTO_CANONICAL );
1046                         }
1047
1048                         $handler = $this->getHandler();
1049                         $script = $this->getTransformScript();
1050                         if ( $script && !( $flags & self::RENDER_NOW ) ) {
1051                                 // Use a script to transform on client request, if possible
1052                                 $thumb = $handler->getScriptedTransform( $this, $script, $params );
1053                                 if ( $thumb ) {
1054                                         break;
1055                                 }
1056                         }
1057
1058                         $normalisedParams = $params;
1059                         $handler->normaliseParams( $this, $normalisedParams );
1060
1061                         $thumbName = $this->thumbName( $normalisedParams );
1062                         $thumbUrl = $this->getThumbUrl( $thumbName );
1063                         $thumbPath = $this->getThumbPath( $thumbName ); // final thumb path
1064
1065                         if ( $this->repo ) {
1066                                 // Defer rendering if a 404 handler is set up...
1067                                 if ( $this->repo->canTransformVia404() && !( $flags & self::RENDER_NOW ) ) {
1068                                         wfDebug( __METHOD__ . " transformation deferred.\n" );
1069                                         // XXX: Pass in the storage path even though we are not rendering anything
1070                                         // and the path is supposed to be an FS path. This is due to getScalerType()
1071                                         // getting called on the path and clobbering $thumb->getUrl() if it's false.
1072                                         $thumb = $handler->getTransform( $this, $thumbPath, $thumbUrl, $params );
1073                                         break;
1074                                 }
1075                                 // Check if an up-to-date thumbnail already exists...
1076                                 wfDebug( __METHOD__ . ": Doing stat for $thumbPath\n" );
1077                                 if ( !( $flags & self::RENDER_FORCE ) && $this->repo->fileExists( $thumbPath ) ) {
1078                                         $timestamp = $this->repo->getFileTimestamp( $thumbPath );
1079                                         if ( $timestamp !== false && $timestamp >= $wgThumbnailEpoch ) {
1080                                                 // XXX: Pass in the storage path even though we are not rendering anything
1081                                                 // and the path is supposed to be an FS path. This is due to getScalerType()
1082                                                 // getting called on the path and clobbering $thumb->getUrl() if it's false.
1083                                                 $thumb = $handler->getTransform( $this, $thumbPath, $thumbUrl, $params );
1084                                                 $thumb->setStoragePath( $thumbPath );
1085                                                 break;
1086                                         }
1087                                 } elseif ( $flags & self::RENDER_FORCE ) {
1088                                         wfDebug( __METHOD__ . " forcing rendering per flag File::RENDER_FORCE\n" );
1089                                 }
1090
1091                                 // If the backend is ready-only, don't keep generating thumbnails
1092                                 // only to return transformation errors, just return the error now.
1093                                 if ( $this->repo->getReadOnlyReason() !== false ) {
1094                                         $thumb = $this->transformErrorOutput( $thumbPath, $thumbUrl, $params, $flags );
1095                                         break;
1096                                 }
1097                         }
1098
1099                         $tmpFile = $this->makeTransformTmpFile( $thumbPath );
1100
1101                         if ( !$tmpFile ) {
1102                                 $thumb = $this->transformErrorOutput( $thumbPath, $thumbUrl, $params, $flags );
1103                         } else {
1104                                 $thumb = $this->generateAndSaveThumb( $tmpFile, $params, $flags );
1105                         }
1106                 } while ( false );
1107
1108                 return is_object( $thumb ) ? $thumb : false;
1109         }
1110
1111         /**
1112          * Generates a thumbnail according to the given parameters and saves it to storage
1113          * @param TempFSFile $tmpFile Temporary file where the rendered thumbnail will be saved
1114          * @param array $transformParams
1115          * @param int $flags
1116          * @return bool|MediaTransformOutput
1117          */
1118         public function generateAndSaveThumb( $tmpFile, $transformParams, $flags ) {
1119                 global $wgIgnoreImageErrors;
1120
1121                 $stats = RequestContext::getMain()->getStats();
1122
1123                 $handler = $this->getHandler();
1124
1125                 $normalisedParams = $transformParams;
1126                 $handler->normaliseParams( $this, $normalisedParams );
1127
1128                 $thumbName = $this->thumbName( $normalisedParams );
1129                 $thumbUrl = $this->getThumbUrl( $thumbName );
1130                 $thumbPath = $this->getThumbPath( $thumbName ); // final thumb path
1131
1132                 $tmpThumbPath = $tmpFile->getPath();
1133
1134                 if ( $handler->supportsBucketing() ) {
1135                         $this->generateBucketsIfNeeded( $normalisedParams, $flags );
1136                 }
1137
1138                 $starttime = microtime( true );
1139
1140                 // Actually render the thumbnail...
1141                 $thumb = $handler->doTransform( $this, $tmpThumbPath, $thumbUrl, $transformParams );
1142                 $tmpFile->bind( $thumb ); // keep alive with $thumb
1143
1144                 $statTiming = microtime( true ) - $starttime;
1145                 $stats->timing( 'media.thumbnail.generate.transform', 1000 * $statTiming );
1146
1147                 if ( !$thumb ) { // bad params?
1148                         $thumb = false;
1149                 } elseif ( $thumb->isError() ) { // transform error
1150                         /** @var $thumb MediaTransformError */
1151                         $this->lastError = $thumb->toText();
1152                         // Ignore errors if requested
1153                         if ( $wgIgnoreImageErrors && !( $flags & self::RENDER_NOW ) ) {
1154                                 $thumb = $handler->getTransform( $this, $tmpThumbPath, $thumbUrl, $transformParams );
1155                         }
1156                 } elseif ( $this->repo && $thumb->hasFile() && !$thumb->fileIsSource() ) {
1157                         // Copy the thumbnail from the file system into storage...
1158
1159                         $starttime = microtime( true );
1160
1161                         $disposition = $this->getThumbDisposition( $thumbName );
1162                         $status = $this->repo->quickImport( $tmpThumbPath, $thumbPath, $disposition );
1163                         if ( $status->isOK() ) {
1164                                 $thumb->setStoragePath( $thumbPath );
1165                         } else {
1166                                 $thumb = $this->transformErrorOutput( $thumbPath, $thumbUrl, $transformParams, $flags );
1167                         }
1168
1169                         $statTiming = microtime( true ) - $starttime;
1170                         $stats->timing( 'media.thumbnail.generate.store', 1000 * $statTiming );
1171
1172                         // Give extensions a chance to do something with this thumbnail...
1173                         Hooks::run( 'FileTransformed', [ $this, $thumb, $tmpThumbPath, $thumbPath ] );
1174                 }
1175
1176                 return $thumb;
1177         }
1178
1179         /**
1180          * Generates chained bucketed thumbnails if needed
1181          * @param array $params
1182          * @param int $flags
1183          * @return bool Whether at least one bucket was generated
1184          */
1185         protected function generateBucketsIfNeeded( $params, $flags = 0 ) {
1186                 if ( !$this->repo
1187                         || !isset( $params['physicalWidth'] )
1188                         || !isset( $params['physicalHeight'] )
1189                 ) {
1190                         return false;
1191                 }
1192
1193                 $bucket = $this->getThumbnailBucket( $params['physicalWidth'] );
1194
1195                 if ( !$bucket || $bucket == $params['physicalWidth'] ) {
1196                         return false;
1197                 }
1198
1199                 $bucketPath = $this->getBucketThumbPath( $bucket );
1200
1201                 if ( $this->repo->fileExists( $bucketPath ) ) {
1202                         return false;
1203                 }
1204
1205                 $starttime = microtime( true );
1206
1207                 $params['physicalWidth'] = $bucket;
1208                 $params['width'] = $bucket;
1209
1210                 $params = $this->getHandler()->sanitizeParamsForBucketing( $params );
1211
1212                 $tmpFile = $this->makeTransformTmpFile( $bucketPath );
1213
1214                 if ( !$tmpFile ) {
1215                         return false;
1216                 }
1217
1218                 $thumb = $this->generateAndSaveThumb( $tmpFile, $params, $flags );
1219
1220                 $buckettime = microtime( true ) - $starttime;
1221
1222                 if ( !$thumb || $thumb->isError() ) {
1223                         return false;
1224                 }
1225
1226                 $this->tmpBucketedThumbCache[$bucket] = $tmpFile->getPath();
1227                 // For the caching to work, we need to make the tmp file survive as long as
1228                 // this object exists
1229                 $tmpFile->bind( $this );
1230
1231                 RequestContext::getMain()->getStats()->timing(
1232                         'media.thumbnail.generate.bucket', 1000 * $buckettime );
1233
1234                 return true;
1235         }
1236
1237         /**
1238          * Returns the most appropriate source image for the thumbnail, given a target thumbnail size
1239          * @param array $params
1240          * @return array Source path and width/height of the source
1241          */
1242         public function getThumbnailSource( $params ) {
1243                 if ( $this->repo
1244                         && $this->getHandler()->supportsBucketing()
1245                         && isset( $params['physicalWidth'] )
1246                         && $bucket = $this->getThumbnailBucket( $params['physicalWidth'] )
1247                 ) {
1248                         if ( $this->getWidth() != 0 ) {
1249                                 $bucketHeight = round( $this->getHeight() * ( $bucket / $this->getWidth() ) );
1250                         } else {
1251                                 $bucketHeight = 0;
1252                         }
1253
1254                         // Try to avoid reading from storage if the file was generated by this script
1255                         if ( isset( $this->tmpBucketedThumbCache[$bucket] ) ) {
1256                                 $tmpPath = $this->tmpBucketedThumbCache[$bucket];
1257
1258                                 if ( file_exists( $tmpPath ) ) {
1259                                         return [
1260                                                 'path' => $tmpPath,
1261                                                 'width' => $bucket,
1262                                                 'height' => $bucketHeight
1263                                         ];
1264                                 }
1265                         }
1266
1267                         $bucketPath = $this->getBucketThumbPath( $bucket );
1268
1269                         if ( $this->repo->fileExists( $bucketPath ) ) {
1270                                 $fsFile = $this->repo->getLocalReference( $bucketPath );
1271
1272                                 if ( $fsFile ) {
1273                                         return [
1274                                                 'path' => $fsFile->getPath(),
1275                                                 'width' => $bucket,
1276                                                 'height' => $bucketHeight
1277                                         ];
1278                                 }
1279                         }
1280                 }
1281
1282                 // Thumbnailing a very large file could result in network saturation if
1283                 // everyone does it at once.
1284                 if ( $this->getSize() >= 1e7 ) { // 10MB
1285                         $that = $this;
1286                         $work = new PoolCounterWorkViaCallback( 'GetLocalFileCopy', sha1( $this->getName() ),
1287                                 [
1288                                         'doWork' => function () use ( $that ) {
1289                                                 return $that->getLocalRefPath();
1290                                         }
1291                                 ]
1292                         );
1293                         $srcPath = $work->execute();
1294                 } else {
1295                         $srcPath = $this->getLocalRefPath();
1296                 }
1297
1298                 // Original file
1299                 return [
1300                         'path' => $srcPath,
1301                         'width' => $this->getWidth(),
1302                         'height' => $this->getHeight()
1303                 ];
1304         }
1305
1306         /**
1307          * Returns the repo path of the thumb for a given bucket
1308          * @param int $bucket
1309          * @return string
1310          */
1311         protected function getBucketThumbPath( $bucket ) {
1312                 $thumbName = $this->getBucketThumbName( $bucket );
1313                 return $this->getThumbPath( $thumbName );
1314         }
1315
1316         /**
1317          * Returns the name of the thumb for a given bucket
1318          * @param int $bucket
1319          * @return string
1320          */
1321         protected function getBucketThumbName( $bucket ) {
1322                 return $this->thumbName( [ 'physicalWidth' => $bucket ] );
1323         }
1324
1325         /**
1326          * Creates a temp FS file with the same extension and the thumbnail
1327          * @param string $thumbPath Thumbnail path
1328          * @return TempFSFile
1329          */
1330         protected function makeTransformTmpFile( $thumbPath ) {
1331                 $thumbExt = FileBackend::extensionFromPath( $thumbPath );
1332                 return TempFSFile::factory( 'transform_', $thumbExt );
1333         }
1334
1335         /**
1336          * @param string $thumbName Thumbnail name
1337          * @param string $dispositionType Type of disposition (either "attachment" or "inline")
1338          * @return string Content-Disposition header value
1339          */
1340         function getThumbDisposition( $thumbName, $dispositionType = 'inline' ) {
1341                 $fileName = $this->name; // file name to suggest
1342                 $thumbExt = FileBackend::extensionFromPath( $thumbName );
1343                 if ( $thumbExt != '' && $thumbExt !== $this->getExtension() ) {
1344                         $fileName .= ".$thumbExt";
1345                 }
1346
1347                 return FileBackend::makeContentDisposition( $dispositionType, $fileName );
1348         }
1349
1350         /**
1351          * Hook into transform() to allow migration of thumbnail files
1352          * STUB
1353          * Overridden by LocalFile
1354          * @param string $thumbName
1355          */
1356         function migrateThumbFile( $thumbName ) {
1357         }
1358
1359         /**
1360          * Get a MediaHandler instance for this file
1361          *
1362          * @return MediaHandler|bool Registered MediaHandler for file's MIME type
1363          *   or false if none found
1364          */
1365         function getHandler() {
1366                 if ( !isset( $this->handler ) ) {
1367                         $this->handler = MediaHandler::getHandler( $this->getMimeType() );
1368                 }
1369
1370                 return $this->handler;
1371         }
1372
1373         /**
1374          * Get a ThumbnailImage representing a file type icon
1375          *
1376          * @return ThumbnailImage
1377          */
1378         function iconThumb() {
1379                 global $wgResourceBasePath, $IP;
1380                 $assetsPath = "$wgResourceBasePath/resources/assets/file-type-icons/";
1381                 $assetsDirectory = "$IP/resources/assets/file-type-icons/";
1382
1383                 $try = [ 'fileicon-' . $this->getExtension() . '.png', 'fileicon.png' ];
1384                 foreach ( $try as $icon ) {
1385                         if ( file_exists( $assetsDirectory . $icon ) ) { // always FS
1386                                 $params = [ 'width' => 120, 'height' => 120 ];
1387
1388                                 return new ThumbnailImage( $this, $assetsPath . $icon, false, $params );
1389                         }
1390                 }
1391
1392                 return null;
1393         }
1394
1395         /**
1396          * Get last thumbnailing error.
1397          * Largely obsolete.
1398          * @return string
1399          */
1400         function getLastError() {
1401                 return $this->lastError;
1402         }
1403
1404         /**
1405          * Get all thumbnail names previously generated for this file
1406          * STUB
1407          * Overridden by LocalFile
1408          * @return array
1409          */
1410         function getThumbnails() {
1411                 return [];
1412         }
1413
1414         /**
1415          * Purge shared caches such as thumbnails and DB data caching
1416          * STUB
1417          * Overridden by LocalFile
1418          * @param array $options Options, which include:
1419          *   'forThumbRefresh' : The purging is only to refresh thumbnails
1420          */
1421         function purgeCache( $options = [] ) {
1422         }
1423
1424         /**
1425          * Purge the file description page, but don't go after
1426          * pages using the file. Use when modifying file history
1427          * but not the current data.
1428          */
1429         function purgeDescription() {
1430                 $title = $this->getTitle();
1431                 if ( $title ) {
1432                         $title->invalidateCache();
1433                         $title->purgeSquid();
1434                 }
1435         }
1436
1437         /**
1438          * Purge metadata and all affected pages when the file is created,
1439          * deleted, or majorly updated.
1440          */
1441         function purgeEverything() {
1442                 // Delete thumbnails and refresh file metadata cache
1443                 $this->purgeCache();
1444                 $this->purgeDescription();
1445
1446                 // Purge cache of all pages using this file
1447                 $title = $this->getTitle();
1448                 if ( $title ) {
1449                         DeferredUpdates::addUpdate( new HTMLCacheUpdate( $title, 'imagelinks' ) );
1450                 }
1451         }
1452
1453         /**
1454          * Return a fragment of the history of file.
1455          *
1456          * STUB
1457          * @param int $limit Limit of rows to return
1458          * @param string $start Only revisions older than $start will be returned
1459          * @param string $end Only revisions newer than $end will be returned
1460          * @param bool $inc Include the endpoints of the time range
1461          *
1462          * @return File[]
1463          */
1464         function getHistory( $limit = null, $start = null, $end = null, $inc = true ) {
1465                 return [];
1466         }
1467
1468         /**
1469          * Return the history of this file, line by line. Starts with current version,
1470          * then old versions. Should return an object similar to an image/oldimage
1471          * database row.
1472          *
1473          * STUB
1474          * Overridden in LocalFile
1475          * @return bool
1476          */
1477         public function nextHistoryLine() {
1478                 return false;
1479         }
1480
1481         /**
1482          * Reset the history pointer to the first element of the history.
1483          * Always call this function after using nextHistoryLine() to free db resources
1484          * STUB
1485          * Overridden in LocalFile.
1486          */
1487         public function resetHistory() {
1488         }
1489
1490         /**
1491          * Get the filename hash component of the directory including trailing slash,
1492          * e.g. f/fa/
1493          * If the repository is not hashed, returns an empty string.
1494          *
1495          * @return string
1496          */
1497         function getHashPath() {
1498                 if ( !isset( $this->hashPath ) ) {
1499                         $this->assertRepoDefined();
1500                         $this->hashPath = $this->repo->getHashPath( $this->getName() );
1501                 }
1502
1503                 return $this->hashPath;
1504         }
1505
1506         /**
1507          * Get the path of the file relative to the public zone root.
1508          * This function is overridden in OldLocalFile to be like getArchiveRel().
1509          *
1510          * @return string
1511          */
1512         function getRel() {
1513                 return $this->getHashPath() . $this->getName();
1514         }
1515
1516         /**
1517          * Get the path of an archived file relative to the public zone root
1518          *
1519          * @param bool|string $suffix If not false, the name of an archived thumbnail file
1520          *
1521          * @return string
1522          */
1523         function getArchiveRel( $suffix = false ) {
1524                 $path = 'archive/' . $this->getHashPath();
1525                 if ( $suffix === false ) {
1526                         $path = substr( $path, 0, -1 );
1527                 } else {
1528                         $path .= $suffix;
1529                 }
1530
1531                 return $path;
1532         }
1533
1534         /**
1535          * Get the path, relative to the thumbnail zone root, of the
1536          * thumbnail directory or a particular file if $suffix is specified
1537          *
1538          * @param bool|string $suffix If not false, the name of a thumbnail file
1539          * @return string
1540          */
1541         function getThumbRel( $suffix = false ) {
1542                 $path = $this->getRel();
1543                 if ( $suffix !== false ) {
1544                         $path .= '/' . $suffix;
1545                 }
1546
1547                 return $path;
1548         }
1549
1550         /**
1551          * Get urlencoded path of the file relative to the public zone root.
1552          * This function is overridden in OldLocalFile to be like getArchiveUrl().
1553          *
1554          * @return string
1555          */
1556         function getUrlRel() {
1557                 return $this->getHashPath() . rawurlencode( $this->getName() );
1558         }
1559
1560         /**
1561          * Get the path, relative to the thumbnail zone root, for an archived file's thumbs directory
1562          * or a specific thumb if the $suffix is given.
1563          *
1564          * @param string $archiveName The timestamped name of an archived image
1565          * @param bool|string $suffix If not false, the name of a thumbnail file
1566          * @return string
1567          */
1568         function getArchiveThumbRel( $archiveName, $suffix = false ) {
1569                 $path = 'archive/' . $this->getHashPath() . $archiveName . "/";
1570                 if ( $suffix === false ) {
1571                         $path = substr( $path, 0, -1 );
1572                 } else {
1573                         $path .= $suffix;
1574                 }
1575
1576                 return $path;
1577         }
1578
1579         /**
1580          * Get the path of the archived file.
1581          *
1582          * @param bool|string $suffix If not false, the name of an archived file.
1583          * @return string
1584          */
1585         function getArchivePath( $suffix = false ) {
1586                 $this->assertRepoDefined();
1587
1588                 return $this->repo->getZonePath( 'public' ) . '/' . $this->getArchiveRel( $suffix );
1589         }
1590
1591         /**
1592          * Get the path of an archived file's thumbs, or a particular thumb if $suffix is specified
1593          *
1594          * @param string $archiveName The timestamped name of an archived image
1595          * @param bool|string $suffix If not false, the name of a thumbnail file
1596          * @return string
1597          */
1598         function getArchiveThumbPath( $archiveName, $suffix = false ) {
1599                 $this->assertRepoDefined();
1600
1601                 return $this->repo->getZonePath( 'thumb' ) . '/' .
1602                 $this->getArchiveThumbRel( $archiveName, $suffix );
1603         }
1604
1605         /**
1606          * Get the path of the thumbnail directory, or a particular file if $suffix is specified
1607          *
1608          * @param bool|string $suffix If not false, the name of a thumbnail file
1609          * @return string
1610          */
1611         function getThumbPath( $suffix = false ) {
1612                 $this->assertRepoDefined();
1613
1614                 return $this->repo->getZonePath( 'thumb' ) . '/' . $this->getThumbRel( $suffix );
1615         }
1616
1617         /**
1618          * Get the path of the transcoded directory, or a particular file if $suffix is specified
1619          *
1620          * @param bool|string $suffix If not false, the name of a media file
1621          * @return string
1622          */
1623         function getTranscodedPath( $suffix = false ) {
1624                 $this->assertRepoDefined();
1625
1626                 return $this->repo->getZonePath( 'transcoded' ) . '/' . $this->getThumbRel( $suffix );
1627         }
1628
1629         /**
1630          * Get the URL of the archive directory, or a particular file if $suffix is specified
1631          *
1632          * @param bool|string $suffix If not false, the name of an archived file
1633          * @return string
1634          */
1635         function getArchiveUrl( $suffix = false ) {
1636                 $this->assertRepoDefined();
1637                 $ext = $this->getExtension();
1638                 $path = $this->repo->getZoneUrl( 'public', $ext ) . '/archive/' . $this->getHashPath();
1639                 if ( $suffix === false ) {
1640                         $path = substr( $path, 0, -1 );
1641                 } else {
1642                         $path .= rawurlencode( $suffix );
1643                 }
1644
1645                 return $path;
1646         }
1647
1648         /**
1649          * Get the URL of the archived file's thumbs, or a particular thumb if $suffix is specified
1650          *
1651          * @param string $archiveName The timestamped name of an archived image
1652          * @param bool|string $suffix If not false, the name of a thumbnail file
1653          * @return string
1654          */
1655         function getArchiveThumbUrl( $archiveName, $suffix = false ) {
1656                 $this->assertRepoDefined();
1657                 $ext = $this->getExtension();
1658                 $path = $this->repo->getZoneUrl( 'thumb', $ext ) . '/archive/' .
1659                         $this->getHashPath() . rawurlencode( $archiveName ) . "/";
1660                 if ( $suffix === false ) {
1661                         $path = substr( $path, 0, -1 );
1662                 } else {
1663                         $path .= rawurlencode( $suffix );
1664                 }
1665
1666                 return $path;
1667         }
1668
1669         /**
1670          * Get the URL of the zone directory, or a particular file if $suffix is specified
1671          *
1672          * @param string $zone Name of requested zone
1673          * @param bool|string $suffix If not false, the name of a file in zone
1674          * @return string Path
1675          */
1676         function getZoneUrl( $zone, $suffix = false ) {
1677                 $this->assertRepoDefined();
1678                 $ext = $this->getExtension();
1679                 $path = $this->repo->getZoneUrl( $zone, $ext ) . '/' . $this->getUrlRel();
1680                 if ( $suffix !== false ) {
1681                         $path .= '/' . rawurlencode( $suffix );
1682                 }
1683
1684                 return $path;
1685         }
1686
1687         /**
1688          * Get the URL of the thumbnail directory, or a particular file if $suffix is specified
1689          *
1690          * @param bool|string $suffix If not false, the name of a thumbnail file
1691          * @return string Path
1692          */
1693         function getThumbUrl( $suffix = false ) {
1694                 return $this->getZoneUrl( 'thumb', $suffix );
1695         }
1696
1697         /**
1698          * Get the URL of the transcoded directory, or a particular file if $suffix is specified
1699          *
1700          * @param bool|string $suffix If not false, the name of a media file
1701          * @return string Path
1702          */
1703         function getTranscodedUrl( $suffix = false ) {
1704                 return $this->getZoneUrl( 'transcoded', $suffix );
1705         }
1706
1707         /**
1708          * Get the public zone virtual URL for a current version source file
1709          *
1710          * @param bool|string $suffix If not false, the name of a thumbnail file
1711          * @return string
1712          */
1713         function getVirtualUrl( $suffix = false ) {
1714                 $this->assertRepoDefined();
1715                 $path = $this->repo->getVirtualUrl() . '/public/' . $this->getUrlRel();
1716                 if ( $suffix !== false ) {
1717                         $path .= '/' . rawurlencode( $suffix );
1718                 }
1719
1720                 return $path;
1721         }
1722
1723         /**
1724          * Get the public zone virtual URL for an archived version source file
1725          *
1726          * @param bool|string $suffix If not false, the name of a thumbnail file
1727          * @return string
1728          */
1729         function getArchiveVirtualUrl( $suffix = false ) {
1730                 $this->assertRepoDefined();
1731                 $path = $this->repo->getVirtualUrl() . '/public/archive/' . $this->getHashPath();
1732                 if ( $suffix === false ) {
1733                         $path = substr( $path, 0, -1 );
1734                 } else {
1735                         $path .= rawurlencode( $suffix );
1736                 }
1737
1738                 return $path;
1739         }
1740
1741         /**
1742          * Get the virtual URL for a thumbnail file or directory
1743          *
1744          * @param bool|string $suffix If not false, the name of a thumbnail file
1745          * @return string
1746          */
1747         function getThumbVirtualUrl( $suffix = false ) {
1748                 $this->assertRepoDefined();
1749                 $path = $this->repo->getVirtualUrl() . '/thumb/' . $this->getUrlRel();
1750                 if ( $suffix !== false ) {
1751                         $path .= '/' . rawurlencode( $suffix );
1752                 }
1753
1754                 return $path;
1755         }
1756
1757         /**
1758          * @return bool
1759          */
1760         function isHashed() {
1761                 $this->assertRepoDefined();
1762
1763                 return (bool)$this->repo->getHashLevels();
1764         }
1765
1766         /**
1767          * @throws MWException
1768          */
1769         function readOnlyError() {
1770                 throw new MWException( get_class( $this ) . ': write operations are not supported' );
1771         }
1772
1773         /**
1774          * Record a file upload in the upload log and the image table
1775          * STUB
1776          * Overridden by LocalFile
1777          * @param string $oldver
1778          * @param string $desc
1779          * @param string $license
1780          * @param string $copyStatus
1781          * @param string $source
1782          * @param bool $watch
1783          * @param string|bool $timestamp
1784          * @param null|User $user User object or null to use $wgUser
1785          * @return bool
1786          * @throws MWException
1787          */
1788         function recordUpload( $oldver, $desc, $license = '', $copyStatus = '', $source = '',
1789                 $watch = false, $timestamp = false, User $user = null
1790         ) {
1791                 $this->readOnlyError();
1792         }
1793
1794         /**
1795          * Move or copy a file to its public location. If a file exists at the
1796          * destination, move it to an archive. Returns a FileRepoStatus object with
1797          * the archive name in the "value" member on success.
1798          *
1799          * The archive name should be passed through to recordUpload for database
1800          * registration.
1801          *
1802          * Options to $options include:
1803          *   - headers : name/value map of HTTP headers to use in response to GET/HEAD requests
1804          *
1805          * @param string $srcPath Local filesystem path to the source image
1806          * @param int $flags A bitwise combination of:
1807          *   File::DELETE_SOURCE    Delete the source file, i.e. move rather than copy
1808          * @param array $options Optional additional parameters
1809          * @return FileRepoStatus On success, the value member contains the
1810          *   archive name, or an empty string if it was a new file.
1811          *
1812          * STUB
1813          * Overridden by LocalFile
1814          */
1815         function publish( $srcPath, $flags = 0, array $options = [] ) {
1816                 $this->readOnlyError();
1817         }
1818
1819         /**
1820          * @param bool|IContextSource $context Context to use (optional)
1821          * @return bool
1822          */
1823         function formatMetadata( $context = false ) {
1824                 if ( !$this->getHandler() ) {
1825                         return false;
1826                 }
1827
1828                 return $this->getHandler()->formatMetadata( $this, $context );
1829         }
1830
1831         /**
1832          * Returns true if the file comes from the local file repository.
1833          *
1834          * @return bool
1835          */
1836         function isLocal() {
1837                 return $this->repo && $this->repo->isLocal();
1838         }
1839
1840         /**
1841          * Returns the name of the repository.
1842          *
1843          * @return string
1844          */
1845         function getRepoName() {
1846                 return $this->repo ? $this->repo->getName() : 'unknown';
1847         }
1848
1849         /**
1850          * Returns the repository
1851          *
1852          * @return FileRepo|LocalRepo|bool
1853          */
1854         function getRepo() {
1855                 return $this->repo;
1856         }
1857
1858         /**
1859          * Returns true if the image is an old version
1860          * STUB
1861          *
1862          * @return bool
1863          */
1864         function isOld() {
1865                 return false;
1866         }
1867
1868         /**
1869          * Is this file a "deleted" file in a private archive?
1870          * STUB
1871          *
1872          * @param int $field One of DELETED_* bitfield constants
1873          * @return bool
1874          */
1875         function isDeleted( $field ) {
1876                 return false;
1877         }
1878
1879         /**
1880          * Return the deletion bitfield
1881          * STUB
1882          * @return int
1883          */
1884         function getVisibility() {
1885                 return 0;
1886         }
1887
1888         /**
1889          * Was this file ever deleted from the wiki?
1890          *
1891          * @return bool
1892          */
1893         function wasDeleted() {
1894                 $title = $this->getTitle();
1895
1896                 return $title && $title->isDeletedQuick();
1897         }
1898
1899         /**
1900          * Move file to the new title
1901          *
1902          * Move current, old version and all thumbnails
1903          * to the new filename. Old file is deleted.
1904          *
1905          * Cache purging is done; checks for validity
1906          * and logging are caller's responsibility
1907          *
1908          * @param Title $target New file name
1909          * @return FileRepoStatus
1910          */
1911         function move( $target ) {
1912                 $this->readOnlyError();
1913         }
1914
1915         /**
1916          * Delete all versions of the file.
1917          *
1918          * Moves the files into an archive directory (or deletes them)
1919          * and removes the database rows.
1920          *
1921          * Cache purging is done; logging is caller's responsibility.
1922          *
1923          * @param string $reason
1924          * @param bool $suppress Hide content from sysops?
1925          * @param User|null $user
1926          * @return FileRepoStatus
1927          * STUB
1928          * Overridden by LocalFile
1929          */
1930         function delete( $reason, $suppress = false, $user = null ) {
1931                 $this->readOnlyError();
1932         }
1933
1934         /**
1935          * Restore all or specified deleted revisions to the given file.
1936          * Permissions and logging are left to the caller.
1937          *
1938          * May throw database exceptions on error.
1939          *
1940          * @param array $versions Set of record ids of deleted items to restore,
1941          *   or empty to restore all revisions.
1942          * @param bool $unsuppress Remove restrictions on content upon restoration?
1943          * @return int|bool The number of file revisions restored if successful,
1944          *   or false on failure
1945          * STUB
1946          * Overridden by LocalFile
1947          */
1948         function restore( $versions = [], $unsuppress = false ) {
1949                 $this->readOnlyError();
1950         }
1951
1952         /**
1953          * Returns 'true' if this file is a type which supports multiple pages,
1954          * e.g. DJVU or PDF. Note that this may be true even if the file in
1955          * question only has a single page.
1956          *
1957          * @return bool
1958          */
1959         function isMultipage() {
1960                 return $this->getHandler() && $this->handler->isMultiPage( $this );
1961         }
1962
1963         /**
1964          * Returns the number of pages of a multipage document, or false for
1965          * documents which aren't multipage documents
1966          *
1967          * @return bool|int
1968          */
1969         function pageCount() {
1970                 if ( !isset( $this->pageCount ) ) {
1971                         if ( $this->getHandler() && $this->handler->isMultiPage( $this ) ) {
1972                                 $this->pageCount = $this->handler->pageCount( $this );
1973                         } else {
1974                                 $this->pageCount = false;
1975                         }
1976                 }
1977
1978                 return $this->pageCount;
1979         }
1980
1981         /**
1982          * Calculate the height of a thumbnail using the source and destination width
1983          *
1984          * @param int $srcWidth
1985          * @param int $srcHeight
1986          * @param int $dstWidth
1987          *
1988          * @return int
1989          */
1990         static function scaleHeight( $srcWidth, $srcHeight, $dstWidth ) {
1991                 // Exact integer multiply followed by division
1992                 if ( $srcWidth == 0 ) {
1993                         return 0;
1994                 } else {
1995                         return round( $srcHeight * $dstWidth / $srcWidth );
1996                 }
1997         }
1998
1999         /**
2000          * Get an image size array like that returned by getImageSize(), or false if it
2001          * can't be determined. Loads the image size directly from the file ignoring caches.
2002          *
2003          * @note Use getWidth()/getHeight() instead of this method unless you have a
2004          *  a good reason. This method skips all caches.
2005          *
2006          * @param string $filePath The path to the file (e.g. From getLocalPathRef() )
2007          * @return array The width, followed by height, with optionally more things after
2008          */
2009         function getImageSize( $filePath ) {
2010                 if ( !$this->getHandler() ) {
2011                         return false;
2012                 }
2013
2014                 return $this->getHandler()->getImageSize( $this, $filePath );
2015         }
2016
2017         /**
2018          * Get the URL of the image description page. May return false if it is
2019          * unknown or not applicable.
2020          *
2021          * @return string
2022          */
2023         function getDescriptionUrl() {
2024                 if ( $this->repo ) {
2025                         return $this->repo->getDescriptionUrl( $this->getName() );
2026                 } else {
2027                         return false;
2028                 }
2029         }
2030
2031         /**
2032          * Get the HTML text of the description page, if available
2033          *
2034          * @param bool|Language $lang Optional language to fetch description in
2035          * @return string
2036          */
2037         function getDescriptionText( $lang = false ) {
2038                 global $wgLang;
2039
2040                 if ( !$this->repo || !$this->repo->fetchDescription ) {
2041                         return false;
2042                 }
2043
2044                 $lang = $lang ?: $wgLang;
2045
2046                 $renderUrl = $this->repo->getDescriptionRenderUrl( $this->getName(), $lang->getCode() );
2047                 if ( $renderUrl ) {
2048                         $cache = ObjectCache::getMainWANInstance();
2049
2050                         $key = null;
2051                         if ( $this->repo->descriptionCacheExpiry > 0 ) {
2052                                 wfDebug( "Attempting to get the description from cache..." );
2053                                 $key = $this->repo->getLocalCacheKey(
2054                                         'RemoteFileDescription',
2055                                         'url',
2056                                         $lang->getCode(),
2057                                         $this->getName()
2058                                 );
2059                                 $obj = $cache->get( $key );
2060                                 if ( $obj ) {
2061                                         wfDebug( "success!\n" );
2062
2063                                         return $obj;
2064                                 }
2065                                 wfDebug( "miss\n" );
2066                         }
2067                         wfDebug( "Fetching shared description from $renderUrl\n" );
2068                         $res = Http::get( $renderUrl, [], __METHOD__ );
2069                         if ( $res && $key ) {
2070                                 $cache->set( $key, $res, $this->repo->descriptionCacheExpiry );
2071                         }
2072
2073                         return $res;
2074                 } else {
2075                         return false;
2076                 }
2077         }
2078
2079         /**
2080          * Get description of file revision
2081          * STUB
2082          *
2083          * @param int $audience One of:
2084          *   File::FOR_PUBLIC       to be displayed to all users
2085          *   File::FOR_THIS_USER    to be displayed to the given user
2086          *   File::RAW              get the description regardless of permissions
2087          * @param User $user User object to check for, only if FOR_THIS_USER is
2088          *   passed to the $audience parameter
2089          * @return string
2090          */
2091         function getDescription( $audience = self::FOR_PUBLIC, User $user = null ) {
2092                 return null;
2093         }
2094
2095         /**
2096          * Get the 14-character timestamp of the file upload
2097          *
2098          * @return string|bool TS_MW timestamp or false on failure
2099          */
2100         function getTimestamp() {
2101                 $this->assertRepoDefined();
2102
2103                 return $this->repo->getFileTimestamp( $this->getPath() );
2104         }
2105
2106         /**
2107          * Returns the timestamp (in TS_MW format) of the last change of the description page.
2108          * Returns false if the file does not have a description page, or retrieving the timestamp
2109          * would be expensive.
2110          * @since 1.25
2111          * @return string|bool
2112          */
2113         public function getDescriptionTouched() {
2114                 return false;
2115         }
2116
2117         /**
2118          * Get the SHA-1 base 36 hash of the file
2119          *
2120          * @return string
2121          */
2122         function getSha1() {
2123                 $this->assertRepoDefined();
2124
2125                 return $this->repo->getFileSha1( $this->getPath() );
2126         }
2127
2128         /**
2129          * Get the deletion archive key, "<sha1>.<ext>"
2130          *
2131          * @return string
2132          */
2133         function getStorageKey() {
2134                 $hash = $this->getSha1();
2135                 if ( !$hash ) {
2136                         return false;
2137                 }
2138                 $ext = $this->getExtension();
2139                 $dotExt = $ext === '' ? '' : ".$ext";
2140
2141                 return $hash . $dotExt;
2142         }
2143
2144         /**
2145          * Determine if the current user is allowed to view a particular
2146          * field of this file, if it's marked as deleted.
2147          * STUB
2148          * @param int $field
2149          * @param User $user User object to check, or null to use $wgUser
2150          * @return bool
2151          */
2152         function userCan( $field, User $user = null ) {
2153                 return true;
2154         }
2155
2156         /**
2157          * @return array HTTP header name/value map to use for HEAD/GET request responses
2158          */
2159         function getStreamHeaders() {
2160                 $handler = $this->getHandler();
2161                 if ( $handler ) {
2162                         return $handler->getStreamHeaders( $this->getMetadata() );
2163                 } else {
2164                         return [];
2165                 }
2166         }
2167
2168         /**
2169          * @return string
2170          */
2171         function getLongDesc() {
2172                 $handler = $this->getHandler();
2173                 if ( $handler ) {
2174                         return $handler->getLongDesc( $this );
2175                 } else {
2176                         return MediaHandler::getGeneralLongDesc( $this );
2177                 }
2178         }
2179
2180         /**
2181          * @return string
2182          */
2183         function getShortDesc() {
2184                 $handler = $this->getHandler();
2185                 if ( $handler ) {
2186                         return $handler->getShortDesc( $this );
2187                 } else {
2188                         return MediaHandler::getGeneralShortDesc( $this );
2189                 }
2190         }
2191
2192         /**
2193          * @return string
2194          */
2195         function getDimensionsString() {
2196                 $handler = $this->getHandler();
2197                 if ( $handler ) {
2198                         return $handler->getDimensionsString( $this );
2199                 } else {
2200                         return '';
2201                 }
2202         }
2203
2204         /**
2205          * @return string
2206          */
2207         function getRedirected() {
2208                 return $this->redirected;
2209         }
2210
2211         /**
2212          * @return Title|null
2213          */
2214         function getRedirectedTitle() {
2215                 if ( $this->redirected ) {
2216                         if ( !$this->redirectTitle ) {
2217                                 $this->redirectTitle = Title::makeTitle( NS_FILE, $this->redirected );
2218                         }
2219
2220                         return $this->redirectTitle;
2221                 }
2222
2223                 return null;
2224         }
2225
2226         /**
2227          * @param string $from
2228          * @return void
2229          */
2230         function redirectedFrom( $from ) {
2231                 $this->redirected = $from;
2232         }
2233
2234         /**
2235          * @return bool
2236          */
2237         function isMissing() {
2238                 return false;
2239         }
2240
2241         /**
2242          * Check if this file object is small and can be cached
2243          * @return bool
2244          */
2245         public function isCacheable() {
2246                 return true;
2247         }
2248
2249         /**
2250          * Assert that $this->repo is set to a valid FileRepo instance
2251          * @throws MWException
2252          */
2253         protected function assertRepoDefined() {
2254                 if ( !( $this->repo instanceof $this->repoClass ) ) {
2255                         throw new MWException( "A {$this->repoClass} object is not set for this File.\n" );
2256                 }
2257         }
2258
2259         /**
2260          * Assert that $this->title is set to a Title
2261          * @throws MWException
2262          */
2263         protected function assertTitleDefined() {
2264                 if ( !( $this->title instanceof Title ) ) {
2265                         throw new MWException( "A Title object is not set for this File.\n" );
2266                 }
2267         }
2268
2269         /**
2270          * True if creating thumbnails from the file is large or otherwise resource-intensive.
2271          * @return bool
2272          */
2273         public function isExpensiveToThumbnail() {
2274                 $handler = $this->getHandler();
2275                 return $handler ? $handler->isExpensiveToThumbnail( $this ) : false;
2276         }
2277
2278         /**
2279          * Whether the thumbnails created on the same server as this code is running.
2280          * @since 1.25
2281          * @return bool
2282          */
2283         public function isTransformedLocally() {
2284                 return true;
2285         }
2286 }