includes/upload/UploadBase.php

   1 <?php
   2 /**
   3  * Base class for the backend of file upload.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  * @ingroup Upload
  22  */
  23
  24 /**
  25  * @defgroup Upload Upload related
  26  */
  27
  28 /**
  29  * @ingroup Upload
  30  *
  31  * UploadBase and subclasses are the backend of MediaWiki's file uploads.
  32  * The frontends are formed by ApiUpload and SpecialUpload.
  33  *
  34  * @author Brion Vibber
  35  * @author Bryan Tong Minh
  36  * @author Michael Dale
  37  */
  38 abstract class UploadBase {
  39         protected $mTempPath;
  40         protected $mDesiredDestName, $mDestName, $mRemoveTempFile, $mSourceType;
  41         protected $mTitle = false, $mTitleError = 0;
  42         protected $mFilteredName, $mFinalExtension;
  43         protected $mLocalFile, $mFileSize, $mFileProps;
  44         protected $mBlackListedExtensions;
  45         protected $mJavaDetected, $mSVGNSError;
  46
  47         protected static $safeXmlEncodings = array(
  48                 'UTF-8',
  49                 'ISO-8859-1',
  50                 'ISO-8859-2',
  51                 'UTF-16',
  52                 'UTF-32'
  53         );
  54
  55         const SUCCESS = 0;
  56         const OK = 0;
  57         const EMPTY_FILE = 3;
  58         const MIN_LENGTH_PARTNAME = 4;
  59         const ILLEGAL_FILENAME = 5;
  60         const OVERWRITE_EXISTING_FILE = 7; # Not used anymore; handled by verifyTitlePermissions()
  61         const FILETYPE_MISSING = 8;
  62         const FILETYPE_BADTYPE = 9;
  63         const VERIFICATION_ERROR = 10;
  64
  65         # HOOK_ABORTED is the new name of UPLOAD_VERIFICATION_ERROR
  66         const UPLOAD_VERIFICATION_ERROR = 11;
  67         const HOOK_ABORTED = 11;
  68         const FILE_TOO_LARGE = 12;
  69         const WINDOWS_NONASCII_FILENAME = 13;
  70         const FILENAME_TOO_LONG = 14;
  71
  72         /**
  73          * @param int $error
  74          * @return string
  75          */
  76         public function getVerificationErrorCode( $error ) {
  77                 $code_to_status = array(
  78                         self::EMPTY_FILE => 'empty-file',
  79                         self::FILE_TOO_LARGE => 'file-too-large',
  80                         self::FILETYPE_MISSING => 'filetype-missing',
  81                         self::FILETYPE_BADTYPE => 'filetype-banned',
  82                         self::MIN_LENGTH_PARTNAME => 'filename-tooshort',
  83                         self::ILLEGAL_FILENAME => 'illegal-filename',
  84                         self::OVERWRITE_EXISTING_FILE => 'overwrite',
  85                         self::VERIFICATION_ERROR => 'verification-error',
  86                         self::HOOK_ABORTED => 'hookaborted',
  87                         self::WINDOWS_NONASCII_FILENAME => 'windows-nonascii-filename',
  88                         self::FILENAME_TOO_LONG => 'filename-toolong',
  89                 );
  90                 if ( isset( $code_to_status[$error] ) ) {
  91                         return $code_to_status[$error];
  92                 }
  93
  94                 return 'unknown-error';
  95         }
  96
  97         /**
  98          * Returns true if uploads are enabled.
  99          * Can be override by subclasses.
 100          * @return bool
 101          */
 102         public static function isEnabled() {
 103                 global $wgEnableUploads;
 104
 105                 if ( !$wgEnableUploads ) {
 106                         return false;
 107                 }
 108
 109                 # Check php's file_uploads setting
 110                 return wfIsHHVM() || wfIniGetBool( 'file_uploads' );
 111         }
 112
 113         /**
 114          * Returns true if the user can use this upload module or else a string
 115          * identifying the missing permission.
 116          * Can be overridden by subclasses.
 117          *
 118          * @param User $user
 119          * @return bool|string
 120          */
 121         public static function isAllowed( $user ) {
 122                 foreach ( array( 'upload', 'edit' ) as $permission ) {
 123                         if ( !$user->isAllowed( $permission ) ) {
 124                                 return $permission;
 125                         }
 126                 }
 127
 128                 return true;
 129         }
 130
 131         // Upload handlers. Should probably just be a global.
 132         private static $uploadHandlers = array( 'Stash', 'File', 'Url' );
 133
 134         /**
 135          * Create a form of UploadBase depending on wpSourceType and initializes it
 136          *
 137          * @param WebRequest $request
 138          * @param string|null $type
 139          * @return null|UploadBase
 140          */
 141         public static function createFromRequest( &$request, $type = null ) {
 142                 $type = $type ? $type : $request->getVal( 'wpSourceType', 'File' );
 143
 144                 if ( !$type ) {
 145                         return null;
 146                 }
 147
 148                 // Get the upload class
 149                 $type = ucfirst( $type );
 150
 151                 // Give hooks the chance to handle this request
 152                 $className = null;
 153                 Hooks::run( 'UploadCreateFromRequest', array( $type, &$className ) );
 154                 if ( is_null( $className ) ) {
 155                         $className = 'UploadFrom' . $type;
 156                         wfDebug( __METHOD__ . ": class name: $className\n" );
 157                         if ( !in_array( $type, self::$uploadHandlers ) ) {
 158                                 return null;
 159                         }
 160                 }
 161
 162                 // Check whether this upload class is enabled
 163                 if ( !call_user_func( array( $className, 'isEnabled' ) ) ) {
 164                         return null;
 165                 }
 166
 167                 // Check whether the request is valid
 168                 if ( !call_user_func( array( $className, 'isValidRequest' ), $request ) ) {
 169                         return null;
 170                 }
 171
 172                 /** @var UploadBase $handler */
 173                 $handler = new $className;
 174
 175                 $handler->initializeFromRequest( $request );
 176
 177                 return $handler;
 178         }
 179
 180         /**
 181          * Check whether a request if valid for this handler
 182          * @param WebRequest $request
 183          * @return bool
 184          */
 185         public static function isValidRequest( $request ) {
 186                 return false;
 187         }
 188
 189         public function __construct() {
 190         }
 191
 192         /**
 193          * Returns the upload type. Should be overridden by child classes
 194          *
 195          * @since 1.18
 196          * @return string
 197          */
 198         public function getSourceType() {
 199                 return null;
 200         }
 201
 202         /**
 203          * Initialize the path information
 204          * @param string $name The desired destination name
 205          * @param string $tempPath The temporary path
 206          * @param int $fileSize The file size
 207          * @param bool $removeTempFile (false) remove the temporary file?
 208          * @throws MWException
 209          */
 210         public function initializePathInfo( $name, $tempPath, $fileSize, $removeTempFile = false ) {
 211                 $this->mDesiredDestName = $name;
 212                 if ( FileBackend::isStoragePath( $tempPath ) ) {
 213                         throw new MWException( __METHOD__ . " given storage path `$tempPath`." );
 214                 }
 215                 $this->mTempPath = $tempPath;
 216                 $this->mFileSize = $fileSize;
 217                 $this->mRemoveTempFile = $removeTempFile;
 218         }
 219
 220         /**
 221          * Initialize from a WebRequest. Override this in a subclass.
 222          *
 223          * @param WebRequest $request
 224          */
 225         abstract public function initializeFromRequest( &$request );
 226
 227         /**
 228          * Fetch the file. Usually a no-op
 229          * @return Status
 230          */
 231         public function fetchFile() {
 232                 return Status::newGood();
 233         }
 234
 235         /**
 236          * Return true if the file is empty
 237          * @return bool
 238          */
 239         public function isEmptyFile() {
 240                 return empty( $this->mFileSize );
 241         }
 242
 243         /**
 244          * Return the file size
 245          * @return int
 246          */
 247         public function getFileSize() {
 248                 return $this->mFileSize;
 249         }
 250
 251         /**
 252          * Get the base 36 SHA1 of the file
 253          * @return string
 254          */
 255         public function getTempFileSha1Base36() {
 256                 return FSFile::getSha1Base36FromPath( $this->mTempPath );
 257         }
 258
 259         /**
 260          * @param string $srcPath The source path
 261          * @return string|bool The real path if it was a virtual URL Returns false on failure
 262          */
 263         function getRealPath( $srcPath ) {
 264                 $repo = RepoGroup::singleton()->getLocalRepo();
 265                 if ( $repo->isVirtualUrl( $srcPath ) ) {
 266                         /** @todo Just make uploads work with storage paths UploadFromStash
 267                          *  loads files via virtual URLs.
 268                          */
 269                         $tmpFile = $repo->getLocalCopy( $srcPath );
 270                         if ( $tmpFile ) {
 271                                 $tmpFile->bind( $this ); // keep alive with $this
 272                         }
 273                         $path = $tmpFile ? $tmpFile->getPath() : false;
 274                 } else {
 275                         $path = $srcPath;
 276                 }
 277
 278                 return $path;
 279         }
 280
 281         /**
 282          * Verify whether the upload is sane.
 283          * @return mixed Const self::OK or else an array with error information
 284          */
 285         public function verifyUpload() {
 286
 287                 /**
 288                  * If there was no filename or a zero size given, give up quick.
 289                  */
 290                 if ( $this->isEmptyFile() ) {
 291
 292                         return array( 'status' => self::EMPTY_FILE );
 293                 }
 294
 295                 /**
 296                  * Honor $wgMaxUploadSize
 297                  */
 298                 $maxSize = self::getMaxUploadSize( $this->getSourceType() );
 299                 if ( $this->mFileSize > $maxSize ) {
 300
 301                         return array(
 302                                 'status' => self::FILE_TOO_LARGE,
 303                                 'max' => $maxSize,
 304                         );
 305                 }
 306
 307                 /**
 308                  * Look at the contents of the file; if we can recognize the
 309                  * type but it's corrupt or data of the wrong type, we should
 310                  * probably not accept it.
 311                  */
 312                 $verification = $this->verifyFile();
 313                 if ( $verification !== true ) {
 314
 315                         return array(
 316                                 'status' => self::VERIFICATION_ERROR,
 317                                 'details' => $verification
 318                         );
 319                 }
 320
 321                 /**
 322                  * Make sure this file can be created
 323                  */
 324                 $result = $this->validateName();
 325                 if ( $result !== true ) {
 326
 327                         return $result;
 328                 }
 329
 330                 $error = '';
 331                 if ( !Hooks::run( 'UploadVerification',
 332                         array( $this->mDestName, $this->mTempPath, &$error ) )
 333                 ) {
 334
 335                         return array( 'status' => self::HOOK_ABORTED, 'error' => $error );
 336                 }
 337
 338
 339                 return array( 'status' => self::OK );
 340         }
 341
 342         /**
 343          * Verify that the name is valid and, if necessary, that we can overwrite
 344          *
 345          * @return mixed True if valid, otherwise and array with 'status'
 346          * and other keys
 347          */
 348         public function validateName() {
 349                 $nt = $this->getTitle();
 350                 if ( is_null( $nt ) ) {
 351                         $result = array( 'status' => $this->mTitleError );
 352                         if ( $this->mTitleError == self::ILLEGAL_FILENAME ) {
 353                                 $result['filtered'] = $this->mFilteredName;
 354                         }
 355                         if ( $this->mTitleError == self::FILETYPE_BADTYPE ) {
 356                                 $result['finalExt'] = $this->mFinalExtension;
 357                                 if ( count( $this->mBlackListedExtensions ) ) {
 358                                         $result['blacklistedExt'] = $this->mBlackListedExtensions;
 359                                 }
 360                         }
 361
 362                         return $result;
 363                 }
 364                 $this->mDestName = $this->getLocalFile()->getName();
 365
 366                 return true;
 367         }
 368
 369         /**
 370          * Verify the MIME type.
 371          *
 372          * @note Only checks that it is not an evil MIME. The "does it have
 373          *  correct extension given its MIME type?" check is in verifyFile.
 374          *  in `verifyFile()` that MIME type and file extension correlate.
 375          * @param string $mime Representing the MIME
 376          * @return mixed True if the file is verified, an array otherwise
 377          */
 378         protected function verifyMimeType( $mime ) {
 379                 global $wgVerifyMimeType;
 380                 if ( $wgVerifyMimeType ) {
 381                         wfDebug( "mime: <$mime> extension: <{$this->mFinalExtension}>\n" );
 382                         global $wgMimeTypeBlacklist;
 383                         if ( $this->checkFileExtension( $mime, $wgMimeTypeBlacklist ) ) {
 384
 385                                 return array( 'filetype-badmime', $mime );
 386                         }
 387
 388                         # Check what Internet Explorer would detect
 389                         $fp = fopen( $this->mTempPath, 'rb' );
 390                         $chunk = fread( $fp, 256 );
 391                         fclose( $fp );
 392
 393                         $magic = MimeMagic::singleton();
 394                         $extMime = $magic->guessTypesForExtension( $this->mFinalExtension );
 395                         $ieTypes = $magic->getIEMimeTypes( $this->mTempPath, $chunk, $extMime );
 396                         foreach ( $ieTypes as $ieType ) {
 397                                 if ( $this->checkFileExtension( $ieType, $wgMimeTypeBlacklist ) ) {
 398
 399                                         return array( 'filetype-bad-ie-mime', $ieType );
 400                                 }
 401                         }
 402                 }
 403
 404
 405                 return true;
 406         }
 407
 408         /**
 409          * Verifies that it's ok to include the uploaded file
 410          *
 411          * @return mixed True of the file is verified, array otherwise.
 412          */
 413         protected function verifyFile() {
 414                 global $wgVerifyMimeType, $wgDisableUploadScriptChecks;
 415
 416                 $status = $this->verifyPartialFile();
 417                 if ( $status !== true ) {
 418
 419                         return $status;
 420                 }
 421
 422                 $this->mFileProps = FSFile::getPropsFromPath( $this->mTempPath, $this->mFinalExtension );
 423                 $mime = $this->mFileProps['mime'];
 424
 425                 if ( $wgVerifyMimeType ) {
 426                         # XXX: Missing extension will be caught by validateName() via getTitle()
 427                         if ( $this->mFinalExtension != '' && !$this->verifyExtension( $mime, $this->mFinalExtension ) ) {
 428
 429                                 return array( 'filetype-mime-mismatch', $this->mFinalExtension, $mime );
 430                         }
 431                 }
 432
 433                 # check for htmlish code and javascript
 434                 if ( !$wgDisableUploadScriptChecks ) {
 435                         if ( $this->mFinalExtension == 'svg' || $mime == 'image/svg+xml' ) {
 436                                 $svgStatus = $this->detectScriptInSvg( $this->mTempPath, false );
 437                                 if ( $svgStatus !== false ) {
 438
 439                                         return $svgStatus;
 440                                 }
 441                         }
 442                 }
 443
 444                 $handler = MediaHandler::getHandler( $mime );
 445                 if ( $handler ) {
 446                         $handlerStatus = $handler->verifyUpload( $this->mTempPath );
 447                         if ( !$handlerStatus->isOK() ) {
 448                                 $errors = $handlerStatus->getErrorsArray();
 449
 450                                 return reset( $errors );
 451                         }
 452                 }
 453
 454                 Hooks::run( 'UploadVerifyFile', array( $this, $mime, &$status ) );
 455                 if ( $status !== true ) {
 456
 457                         return $status;
 458                 }
 459
 460                 wfDebug( __METHOD__ . ": all clear; passing.\n" );
 461
 462                 return true;
 463         }
 464
 465         /**
 466          * A verification routine suitable for partial files
 467          *
 468          * Runs the blacklist checks, but not any checks that may
 469          * assume the entire file is present.
 470          *
 471          * @return mixed True for valid or array with error message key.
 472          */
 473         protected function verifyPartialFile() {
 474                 global $wgAllowJavaUploads, $wgDisableUploadScriptChecks;
 475
 476                 # getTitle() sets some internal parameters like $this->mFinalExtension
 477                 $this->getTitle();
 478
 479                 $this->mFileProps = FSFile::getPropsFromPath( $this->mTempPath, $this->mFinalExtension );
 480
 481                 # check MIME type, if desired
 482                 $mime = $this->mFileProps['file-mime'];
 483                 $status = $this->verifyMimeType( $mime );
 484                 if ( $status !== true ) {
 485
 486                         return $status;
 487                 }
 488
 489                 # check for htmlish code and javascript
 490                 if ( !$wgDisableUploadScriptChecks ) {
 491                         if ( self::detectScript( $this->mTempPath, $mime, $this->mFinalExtension ) ) {
 492
 493                                 return array( 'uploadscripted' );
 494                         }
 495                         if ( $this->mFinalExtension == 'svg' || $mime == 'image/svg+xml' ) {
 496                                 $svgStatus = $this->detectScriptInSvg( $this->mTempPath, true );
 497                                 if ( $svgStatus !== false ) {
 498
 499                                         return $svgStatus;
 500                                 }
 501                         }
 502                 }
 503
 504                 # Check for Java applets, which if uploaded can bypass cross-site
 505                 # restrictions.
 506                 if ( !$wgAllowJavaUploads ) {
 507                         $this->mJavaDetected = false;
 508                         $zipStatus = ZipDirectoryReader::read( $this->mTempPath,
 509                                 array( $this, 'zipEntryCallback' ) );
 510                         if ( !$zipStatus->isOK() ) {
 511                                 $errors = $zipStatus->getErrorsArray();
 512                                 $error = reset( $errors );
 513                                 if ( $error[0] !== 'zip-wrong-format' ) {
 514
 515                                         return $error;
 516                                 }
 517                         }
 518                         if ( $this->mJavaDetected ) {
 519
 520                                 return array( 'uploadjava' );
 521                         }
 522                 }
 523
 524                 # Scan the uploaded file for viruses
 525                 $virus = $this->detectVirus( $this->mTempPath );
 526                 if ( $virus ) {
 527
 528                         return array( 'uploadvirus', $virus );
 529                 }
 530
 531
 532                 return true;
 533         }
 534
 535         /**
 536          * Callback for ZipDirectoryReader to detect Java class files.
 537          *
 538          * @param array $entry
 539          */
 540         function zipEntryCallback( $entry ) {
 541                 $names = array( $entry['name'] );
 542
 543                 // If there is a null character, cut off the name at it, because JDK's
 544                 // ZIP_GetEntry() uses strcmp() if the name hashes match. If a file name
 545                 // were constructed which had ".class\0" followed by a string chosen to
 546                 // make the hash collide with the truncated name, that file could be
 547                 // returned in response to a request for the .class file.
 548                 $nullPos = strpos( $entry['name'], "\000" );
 549                 if ( $nullPos !== false ) {
 550                         $names[] = substr( $entry['name'], 0, $nullPos );
 551                 }
 552
 553                 // If there is a trailing slash in the file name, we have to strip it,
 554                 // because that's what ZIP_GetEntry() does.
 555                 if ( preg_grep( '!\.class/?$!', $names ) ) {
 556                         $this->mJavaDetected = true;
 557                 }
 558         }
 559
 560         /**
 561          * Alias for verifyTitlePermissions. The function was originally
 562          * 'verifyPermissions', but that suggests it's checking the user, when it's
 563          * really checking the title + user combination.
 564          *
 565          * @param User $user User object to verify the permissions against
 566          * @return mixed An array as returned by getUserPermissionsErrors or true
 567          *   in case the user has proper permissions.
 568          */
 569         public function verifyPermissions( $user ) {
 570                 return $this->verifyTitlePermissions( $user );
 571         }
 572
 573         /**
 574          * Check whether the user can edit, upload and create the image. This
 575          * checks only against the current title; if it returns errors, it may
 576          * very well be that another title will not give errors. Therefore
 577          * isAllowed() should be called as well for generic is-user-blocked or
 578          * can-user-upload checking.
 579          *
 580          * @param User $user User object to verify the permissions against
 581          * @return mixed An array as returned by getUserPermissionsErrors or true
 582          *   in case the user has proper permissions.
 583          */
 584         public function verifyTitlePermissions( $user ) {
 585                 /**
 586                  * If the image is protected, non-sysop users won't be able
 587                  * to modify it by uploading a new revision.
 588                  */
 589                 $nt = $this->getTitle();
 590                 if ( is_null( $nt ) ) {
 591                         return true;
 592                 }
 593                 $permErrors = $nt->getUserPermissionsErrors( 'edit', $user );
 594                 $permErrorsUpload = $nt->getUserPermissionsErrors( 'upload', $user );
 595                 if ( !$nt->exists() ) {
 596                         $permErrorsCreate = $nt->getUserPermissionsErrors( 'create', $user );
 597                 } else {
 598                         $permErrorsCreate = array();
 599                 }
 600                 if ( $permErrors || $permErrorsUpload || $permErrorsCreate ) {
 601                         $permErrors = array_merge( $permErrors, wfArrayDiff2( $permErrorsUpload, $permErrors ) );
 602                         $permErrors = array_merge( $permErrors, wfArrayDiff2( $permErrorsCreate, $permErrors ) );
 603
 604                         return $permErrors;
 605                 }
 606
 607                 $overwriteError = $this->checkOverwrite( $user );
 608                 if ( $overwriteError !== true ) {
 609                         return array( $overwriteError );
 610                 }
 611
 612                 return true;
 613         }
 614
 615         /**
 616          * Check for non fatal problems with the file.
 617          *
 618          * This should not assume that mTempPath is set.
 619          *
 620          * @return array Array of warnings
 621          */
 622         public function checkWarnings() {
 623                 global $wgLang;
 624
 625                 $warnings = array();
 626
 627                 $localFile = $this->getLocalFile();
 628                 $filename = $localFile->getName();
 629
 630                 /**
 631                  * Check whether the resulting filename is different from the desired one,
 632                  * but ignore things like ucfirst() and spaces/underscore things
 633                  */
 634                 $comparableName = str_replace( ' ', '_', $this->mDesiredDestName );
 635                 $comparableName = Title::capitalize( $comparableName, NS_FILE );
 636
 637                 if ( $this->mDesiredDestName != $filename && $comparableName != $filename ) {
 638                         $warnings['badfilename'] = $filename;
 639                         // Debugging for bug 62241
 640                         wfDebugLog( 'upload', "Filename: '$filename', mDesiredDestName: "
 641                                 . "'$this->mDesiredDestName', comparableName: '$comparableName'" );
 642                 }
 643
 644                 // Check whether the file extension is on the unwanted list
 645                 global $wgCheckFileExtensions, $wgFileExtensions;
 646                 if ( $wgCheckFileExtensions ) {
 647                         $extensions = array_unique( $wgFileExtensions );
 648                         if ( !$this->checkFileExtension( $this->mFinalExtension, $extensions ) ) {
 649                                 $warnings['filetype-unwanted-type'] = array( $this->mFinalExtension,
 650                                         $wgLang->commaList( $extensions ), count( $extensions ) );
 651                         }
 652                 }
 653
 654                 global $wgUploadSizeWarning;
 655                 if ( $wgUploadSizeWarning && ( $this->mFileSize > $wgUploadSizeWarning ) ) {
 656                         $warnings['large-file'] = array( $wgUploadSizeWarning, $this->mFileSize );
 657                 }
 658
 659                 if ( $this->mFileSize == 0 ) {
 660                         $warnings['emptyfile'] = true;
 661                 }
 662
 663                 $exists = self::getExistsWarning( $localFile );
 664                 if ( $exists !== false ) {
 665                         $warnings['exists'] = $exists;
 666                 }
 667
 668                 // Check dupes against existing files
 669                 $hash = $this->getTempFileSha1Base36();
 670                 $dupes = RepoGroup::singleton()->findBySha1( $hash );
 671                 $title = $this->getTitle();
 672                 // Remove all matches against self
 673                 foreach ( $dupes as $key => $dupe ) {
 674                         if ( $title->equals( $dupe->getTitle() ) ) {
 675                                 unset( $dupes[$key] );
 676                         }
 677                 }
 678                 if ( $dupes ) {
 679                         $warnings['duplicate'] = $dupes;
 680                 }
 681
 682                 // Check dupes against archives
 683                 $archivedImage = new ArchivedFile( null, 0, "{$hash}.{$this->mFinalExtension}" );
 684                 if ( $archivedImage->getID() > 0 ) {
 685                         if ( $archivedImage->userCan( File::DELETED_FILE ) ) {
 686                                 $warnings['duplicate-archive'] = $archivedImage->getName();
 687                         } else {
 688                                 $warnings['duplicate-archive'] = '';
 689                         }
 690                 }
 691
 692
 693                 return $warnings;
 694         }
 695
 696         /**
 697          * Really perform the upload. Stores the file in the local repo, watches
 698          * if necessary and runs the UploadComplete hook.
 699          *
 700          * @param string $comment
 701          * @param string $pageText
 702          * @param bool $watch
 703          * @param User $user
 704          *
 705          * @return Status Indicating the whether the upload succeeded.
 706          */
 707         public function performUpload( $comment, $pageText, $watch, $user ) {
 708
 709                 $status = $this->getLocalFile()->upload(
 710                         $this->mTempPath,
 711                         $comment,
 712                         $pageText,
 713                         File::DELETE_SOURCE,
 714                         $this->mFileProps,
 715                         false,
 716                         $user
 717                 );
 718
 719                 if ( $status->isGood() ) {
 720                         if ( $watch ) {
 721                                 WatchAction::doWatch(
 722                                         $this->getLocalFile()->getTitle(),
 723                                         $user,
 724                                         WatchedItem::IGNORE_USER_RIGHTS
 725                                 );
 726                         }
 727                         Hooks::run( 'UploadComplete', array( &$this ) );
 728
 729                         $this->postProcessUpload();
 730                 }
 731
 732
 733                 return $status;
 734         }
 735
 736         /**
 737          * Perform extra steps after a successful upload.
 738          *
 739          * @since  1.25
 740          */
 741         public function postProcessUpload() {
 742                 global $wgUploadThumbnailRenderMap;
 743
 744                 $jobs = array();
 745
 746                 $sizes = $wgUploadThumbnailRenderMap;
 747                 rsort( $sizes );
 748
 749                 $file = $this->getLocalFile();
 750
 751                 foreach ( $sizes as $size ) {
 752                         if ( $file->isVectorized()
 753                                 || $file->getWidth() > $size ) {
 754                                         $jobs[] = new ThumbnailRenderJob( $file->getTitle(), array(
 755                                                 'transformParams' => array( 'width' => $size ),
 756                                         ) );
 757                         }
 758                 }
 759
 760                 if ( $jobs ) {
 761                         JobQueueGroup::singleton()->push( $jobs );
 762                 }
 763         }
 764
 765         /**
 766          * Returns the title of the file to be uploaded. Sets mTitleError in case
 767          * the name was illegal.
 768          *
 769          * @return Title The title of the file or null in case the name was illegal
 770          */
 771         public function getTitle() {
 772                 if ( $this->mTitle !== false ) {
 773                         return $this->mTitle;
 774                 }
 775                 /* Assume that if a user specified File:Something.jpg, this is an error
 776                  * and that the namespace prefix needs to be stripped of.
 777                  */
 778                 $title = Title::newFromText( $this->mDesiredDestName );
 779                 if ( $title && $title->getNamespace() == NS_FILE ) {
 780                         $this->mFilteredName = $title->getDBkey();
 781                 } else {
 782                         $this->mFilteredName = $this->mDesiredDestName;
 783                 }
 784
 785                 # oi_archive_name is max 255 bytes, which include a timestamp and an
 786                 # exclamation mark, so restrict file name to 240 bytes.
 787                 if ( strlen( $this->mFilteredName ) > 240 ) {
 788                         $this->mTitleError = self::FILENAME_TOO_LONG;
 789                         $this->mTitle = null;
 790
 791                         return $this->mTitle;
 792                 }
 793
 794                 /**
 795                  * Chop off any directories in the given filename. Then
 796                  * filter out illegal characters, and try to make a legible name
 797                  * out of it. We'll strip some silently that Title would die on.
 798                  */
 799                 $this->mFilteredName = wfStripIllegalFilenameChars( $this->mFilteredName );
 800                 /* Normalize to title form before we do any further processing */
 801                 $nt = Title::makeTitleSafe( NS_FILE, $this->mFilteredName );
 802                 if ( is_null( $nt ) ) {
 803                         $this->mTitleError = self::ILLEGAL_FILENAME;
 804                         $this->mTitle = null;
 805
 806                         return $this->mTitle;
 807                 }
 808                 $this->mFilteredName = $nt->getDBkey();
 809
 810                 /**
 811                  * We'll want to blacklist against *any* 'extension', and use
 812                  * only the final one for the whitelist.
 813                  */
 814                 list( $partname, $ext ) = $this->splitExtensions( $this->mFilteredName );
 815
 816                 if ( count( $ext ) ) {
 817                         $this->mFinalExtension = trim( $ext[count( $ext ) - 1] );
 818                 } else {
 819                         $this->mFinalExtension = '';
 820
 821                         # No extension, try guessing one
 822                         $magic = MimeMagic::singleton();
 823                         $mime = $magic->guessMimeType( $this->mTempPath );
 824                         if ( $mime !== 'unknown/unknown' ) {
 825                                 # Get a space separated list of extensions
 826                                 $extList = $magic->getExtensionsForType( $mime );
 827                                 if ( $extList ) {
 828                                         # Set the extension to the canonical extension
 829                                         $this->mFinalExtension = strtok( $extList, ' ' );
 830
 831                                         # Fix up the other variables
 832                                         $this->mFilteredName .= ".{$this->mFinalExtension}";
 833                                         $nt = Title::makeTitleSafe( NS_FILE, $this->mFilteredName );
 834                                         $ext = array( $this->mFinalExtension );
 835                                 }
 836                         }
 837                 }
 838
 839                 /* Don't allow users to override the blacklist (check file extension) */
 840                 global $wgCheckFileExtensions, $wgStrictFileExtensions;
 841                 global $wgFileExtensions, $wgFileBlacklist;
 842
 843                 $blackListedExtensions = $this->checkFileExtensionList( $ext, $wgFileBlacklist );
 844
 845                 if ( $this->mFinalExtension == '' ) {
 846                         $this->mTitleError = self::FILETYPE_MISSING;
 847                         $this->mTitle = null;
 848
 849                         return $this->mTitle;
 850                 } elseif ( $blackListedExtensions ||
 851                         ( $wgCheckFileExtensions && $wgStrictFileExtensions &&
 852                                 !$this->checkFileExtension( $this->mFinalExtension, $wgFileExtensions ) )
 853                 ) {
 854                         $this->mBlackListedExtensions = $blackListedExtensions;
 855                         $this->mTitleError = self::FILETYPE_BADTYPE;
 856                         $this->mTitle = null;
 857
 858                         return $this->mTitle;
 859                 }
 860
 861                 // Windows may be broken with special characters, see bug 1780
 862                 if ( !preg_match( '/^[\x0-\x7f]*$/', $nt->getText() )
 863                         && !RepoGroup::singleton()->getLocalRepo()->backendSupportsUnicodePaths()
 864                 ) {
 865                         $this->mTitleError = self::WINDOWS_NONASCII_FILENAME;
 866                         $this->mTitle = null;
 867
 868                         return $this->mTitle;
 869                 }
 870
 871                 # If there was more than one "extension", reassemble the base
 872                 # filename to prevent bogus complaints about length
 873                 if ( count( $ext ) > 1 ) {
 874                         $iterations = count( $ext ) - 1;
 875                         for ( $i = 0; $i < $iterations; $i++ ) {
 876                                 $partname .= '.' . $ext[$i];
 877                         }
 878                 }
 879
 880                 if ( strlen( $partname ) < 1 ) {
 881                         $this->mTitleError = self::MIN_LENGTH_PARTNAME;
 882                         $this->mTitle = null;
 883
 884                         return $this->mTitle;
 885                 }
 886
 887                 $this->mTitle = $nt;
 888
 889                 return $this->mTitle;
 890         }
 891
 892         /**
 893          * Return the local file and initializes if necessary.
 894          *
 895          * @return LocalFile|UploadStashFile|null
 896          */
 897         public function getLocalFile() {
 898                 if ( is_null( $this->mLocalFile ) ) {
 899                         $nt = $this->getTitle();
 900                         $this->mLocalFile = is_null( $nt ) ? null : wfLocalFile( $nt );
 901                 }
 902
 903                 return $this->mLocalFile;
 904         }
 905
 906         /**
 907          * If the user does not supply all necessary information in the first upload
 908          * form submission (either by accident or by design) then we may want to
 909          * stash the file temporarily, get more information, and publish the file
 910          * later.
 911          *
 912          * This method will stash a file in a temporary directory for later
 913          * processing, and save the necessary descriptive info into the database.
 914          * This method returns the file object, which also has a 'fileKey' property
 915          * which can be passed through a form or API request to find this stashed
 916          * file again.
 917          *
 918          * @param User $user
 919          * @return UploadStashFile Stashed file
 920          */
 921         public function stashFile( User $user = null ) {
 922                 // was stashSessionFile
 923
 924                 $stash = RepoGroup::singleton()->getLocalRepo()->getUploadStash( $user );
 925                 $file = $stash->stashFile( $this->mTempPath, $this->getSourceType() );
 926                 $this->mLocalFile = $file;
 927
 928
 929                 return $file;
 930         }
 931
 932         /**
 933          * Stash a file in a temporary directory, returning a key which can be used
 934          * to find the file again. See stashFile().
 935          *
 936          * @return string File key
 937          */
 938         public function stashFileGetKey() {
 939                 return $this->stashFile()->getFileKey();
 940         }
 941
 942         /**
 943          * alias for stashFileGetKey, for backwards compatibility
 944          *
 945          * @return string File key
 946          */
 947         public function stashSession() {
 948                 return $this->stashFileGetKey();
 949         }
 950
 951         /**
 952          * If we've modified the upload file we need to manually remove it
 953          * on exit to clean up.
 954          */
 955         public function cleanupTempFile() {
 956                 if ( $this->mRemoveTempFile && $this->mTempPath && file_exists( $this->mTempPath ) ) {
 957                         wfDebug( __METHOD__ . ": Removing temporary file {$this->mTempPath}\n" );
 958                         unlink( $this->mTempPath );
 959                 }
 960         }
 961
 962         public function getTempPath() {
 963                 return $this->mTempPath;
 964         }
 965
 966         /**
 967          * Split a file into a base name and all dot-delimited 'extensions'
 968          * on the end. Some web server configurations will fall back to
 969          * earlier pseudo-'extensions' to determine type and execute
 970          * scripts, so the blacklist needs to check them all.
 971          *
 972          * @param string $filename
 973          * @return array
 974          */
 975         public static function splitExtensions( $filename ) {
 976                 $bits = explode( '.', $filename );
 977                 $basename = array_shift( $bits );
 978
 979                 return array( $basename, $bits );
 980         }
 981
 982         /**
 983          * Perform case-insensitive match against a list of file extensions.
 984          * Returns true if the extension is in the list.
 985          *
 986          * @param string $ext
 987          * @param array $list
 988          * @return bool
 989          */
 990         public static function checkFileExtension( $ext, $list ) {
 991                 return in_array( strtolower( $ext ), $list );
 992         }
 993
 994         /**
 995          * Perform case-insensitive match against a list of file extensions.
 996          * Returns an array of matching extensions.
 997          *
 998          * @param array $ext
 999          * @param array $list
1000          * @return bool
1001          */
1002         public static function checkFileExtensionList( $ext, $list ) {
1003                 return array_intersect( array_map( 'strtolower', $ext ), $list );
1004         }
1005
1006         /**
1007          * Checks if the MIME type of the uploaded file matches the file extension.
1008          *
1009          * @param string $mime The MIME type of the uploaded file
1010          * @param string $extension The filename extension that the file is to be served with
1011          * @return bool
1012          */
1013         public static function verifyExtension( $mime, $extension ) {
1014                 $magic = MimeMagic::singleton();
1015
1016                 if ( !$mime || $mime == 'unknown' || $mime == 'unknown/unknown' ) {
1017                         if ( !$magic->isRecognizableExtension( $extension ) ) {
1018                                 wfDebug( __METHOD__ . ": passing file with unknown detected mime type; " .
1019                                         "unrecognized extension '$extension', can't verify\n" );
1020
1021                                 return true;
1022                         } else {
1023                                 wfDebug( __METHOD__ . ": rejecting file with unknown detected mime type; " .
1024                                         "recognized extension '$extension', so probably invalid file\n" );
1025
1026                                 return false;
1027                         }
1028                 }
1029
1030                 $match = $magic->isMatchingExtension( $extension, $mime );
1031
1032                 if ( $match === null ) {
1033                         if ( $magic->getTypesForExtension( $extension ) !== null ) {
1034                                 wfDebug( __METHOD__ . ": No extension known for $mime, but we know a mime for $extension\n" );
1035
1036                                 return false;
1037                         } else {
1038                                 wfDebug( __METHOD__ . ": no file extension known for mime type $mime, passing file\n" );
1039
1040                                 return true;
1041                         }
1042                 } elseif ( $match === true ) {
1043                         wfDebug( __METHOD__ . ": mime type $mime matches extension $extension, passing file\n" );
1044
1045                         /** @todo If it's a bitmap, make sure PHP or ImageMagick resp. can handle it! */
1046                         return true;
1047                 } else {
1048                         wfDebug( __METHOD__
1049                                 . ": mime type $mime mismatches file extension $extension, rejecting file\n" );
1050
1051                         return false;
1052                 }
1053         }
1054
1055         /**
1056          * Heuristic for detecting files that *could* contain JavaScript instructions or
1057          * things that may look like HTML to a browser and are thus
1058          * potentially harmful. The present implementation will produce false
1059          * positives in some situations.
1060          *
1061          * @param string $file Pathname to the temporary upload file
1062          * @param string $mime The MIME type of the file
1063          * @param string $extension The extension of the file
1064          * @return bool True if the file contains something looking like embedded scripts
1065          */
1066         public static function detectScript( $file, $mime, $extension ) {
1067                 global $wgAllowTitlesInSVG;
1068
1069                 # ugly hack: for text files, always look at the entire file.
1070                 # For binary field, just check the first K.
1071
1072                 if ( strpos( $mime, 'text/' ) === 0 ) {
1073                         $chunk = file_get_contents( $file );
1074                 } else {
1075                         $fp = fopen( $file, 'rb' );
1076                         $chunk = fread( $fp, 1024 );
1077                         fclose( $fp );
1078                 }
1079
1080                 $chunk = strtolower( $chunk );
1081
1082                 if ( !$chunk ) {
1083
1084                         return false;
1085                 }
1086
1087                 # decode from UTF-16 if needed (could be used for obfuscation).
1088                 if ( substr( $chunk, 0, 2 ) == "\xfe\xff" ) {
1089                         $enc = 'UTF-16BE';
1090                 } elseif ( substr( $chunk, 0, 2 ) == "\xff\xfe" ) {
1091                         $enc = 'UTF-16LE';
1092                 } else {
1093                         $enc = null;
1094                 }
1095
1096                 if ( $enc ) {
1097                         $chunk = iconv( $enc, "ASCII//IGNORE", $chunk );
1098                 }
1099
1100                 $chunk = trim( $chunk );
1101
1102                 /** @todo FIXME: Convert from UTF-16 if necessary! */
1103                 wfDebug( __METHOD__ . ": checking for embedded scripts and HTML stuff\n" );
1104
1105                 # check for HTML doctype
1106                 if ( preg_match( "/<!DOCTYPE *X?HTML/i", $chunk ) ) {
1107
1108                         return true;
1109                 }
1110
1111                 // Some browsers will interpret obscure xml encodings as UTF-8, while
1112                 // PHP/expat will interpret the given encoding in the xml declaration (bug 47304)
1113                 if ( $extension == 'svg' || strpos( $mime, 'image/svg' ) === 0 ) {
1114                         if ( self::checkXMLEncodingMissmatch( $file ) ) {
1115
1116                                 return true;
1117                         }
1118                 }
1119
1120                 /**
1121                  * Internet Explorer for Windows performs some really stupid file type
1122                  * autodetection which can cause it to interpret valid image files as HTML
1123                  * and potentially execute JavaScript, creating a cross-site scripting
1124                  * attack vectors.
1125                  *
1126                  * Apple's Safari browser also performs some unsafe file type autodetection
1127                  * which can cause legitimate files to be interpreted as HTML if the
1128                  * web server is not correctly configured to send the right content-type
1129                  * (or if you're really uploading plain text and octet streams!)
1130                  *
1131                  * Returns true if IE is likely to mistake the given file for HTML.
1132                  * Also returns true if Safari would mistake the given file for HTML
1133                  * when served with a generic content-type.
1134                  */
1135                 $tags = array(
1136                         '<a href',
1137                         '<body',
1138                         '<head',
1139                         '<html', #also in safari
1140                         '<img',
1141                         '<pre',
1142                         '<script', #also in safari
1143                         '<table'
1144                 );
1145
1146                 if ( !$wgAllowTitlesInSVG && $extension !== 'svg' && $mime !== 'image/svg' ) {
1147                         $tags[] = '<title';
1148                 }
1149
1150                 foreach ( $tags as $tag ) {
1151                         if ( false !== strpos( $chunk, $tag ) ) {
1152                                 wfDebug( __METHOD__ . ": found something that may make it be mistaken for html: $tag\n" );
1153
1154                                 return true;
1155                         }
1156                 }
1157
1158                 /*
1159                  * look for JavaScript
1160                  */
1161
1162                 # resolve entity-refs to look at attributes. may be harsh on big files... cache result?
1163                 $chunk = Sanitizer::decodeCharReferences( $chunk );
1164
1165                 # look for script-types
1166                 if ( preg_match( '!type\s*=\s*[\'"]?\s*(?:\w*/)?(?:ecma|java)!sim', $chunk ) ) {
1167                         wfDebug( __METHOD__ . ": found script types\n" );
1168
1169                         return true;
1170                 }
1171
1172                 # look for html-style script-urls
1173                 if ( preg_match( '!(?:href|src|data)\s*=\s*[\'"]?\s*(?:ecma|java)script:!sim', $chunk ) ) {
1174                         wfDebug( __METHOD__ . ": found html-style script urls\n" );
1175
1176                         return true;
1177                 }
1178
1179                 # look for css-style script-urls
1180                 if ( preg_match( '!url\s*\(\s*[\'"]?\s*(?:ecma|java)script:!sim', $chunk ) ) {
1181                         wfDebug( __METHOD__ . ": found css-style script urls\n" );
1182
1183                         return true;
1184                 }
1185
1186                 wfDebug( __METHOD__ . ": no scripts found\n" );
1187
1188                 return false;
1189         }
1190
1191         /**
1192          * Check a whitelist of xml encodings that are known not to be interpreted differently
1193          * by the server's xml parser (expat) and some common browsers.
1194          *
1195          * @param string $file Pathname to the temporary upload file
1196          * @return bool True if the file contains an encoding that could be misinterpreted
1197          */
1198         public static function checkXMLEncodingMissmatch( $file ) {
1199                 global $wgSVGMetadataCutoff;
1200                 $contents = file_get_contents( $file, false, null, -1, $wgSVGMetadataCutoff );
1201                 $encodingRegex = '!encoding[ \t\n\r]*=[ \t\n\r]*[\'"](.*?)[\'"]!si';
1202
1203                 if ( preg_match( "!<\?xml\b(.*?)\?>!si", $contents, $matches ) ) {
1204                         if ( preg_match( $encodingRegex, $matches[1], $encMatch )
1205                                 && !in_array( strtoupper( $encMatch[1] ), self::$safeXmlEncodings )
1206                         ) {
1207                                 wfDebug( __METHOD__ . ": Found unsafe XML encoding '{$encMatch[1]}'\n" );
1208
1209                                 return true;
1210                         }
1211                 } elseif ( preg_match( "!<\?xml\b!si", $contents ) ) {
1212                         // Start of XML declaration without an end in the first $wgSVGMetadataCutoff
1213                         // bytes. There shouldn't be a legitimate reason for this to happen.
1214                         wfDebug( __METHOD__ . ": Unmatched XML declaration start\n" );
1215
1216                         return true;
1217                 } elseif ( substr( $contents, 0, 4 ) == "\x4C\x6F\xA7\x94" ) {
1218                         // EBCDIC encoded XML
1219                         wfDebug( __METHOD__ . ": EBCDIC Encoded XML\n" );
1220
1221                         return true;
1222                 }
1223
1224                 // It's possible the file is encoded with multi-byte encoding, so re-encode attempt to
1225                 // detect the encoding in case is specifies an encoding not whitelisted in self::$safeXmlEncodings
1226                 $attemptEncodings = array( 'UTF-16', 'UTF-16BE', 'UTF-32', 'UTF-32BE' );
1227                 foreach ( $attemptEncodings as $encoding ) {
1228                         wfSuppressWarnings();
1229                         $str = iconv( $encoding, 'UTF-8', $contents );
1230                         wfRestoreWarnings();
1231                         if ( $str != '' && preg_match( "!<\?xml\b(.*?)\?>!si", $str, $matches ) ) {
1232                                 if ( preg_match( $encodingRegex, $matches[1], $encMatch )
1233                                         && !in_array( strtoupper( $encMatch[1] ), self::$safeXmlEncodings )
1234                                 ) {
1235                                         wfDebug( __METHOD__ . ": Found unsafe XML encoding '{$encMatch[1]}'\n" );
1236
1237                                         return true;
1238                                 }
1239                         } elseif ( $str != '' && preg_match( "!<\?xml\b!si", $str ) ) {
1240                                 // Start of XML declaration without an end in the first $wgSVGMetadataCutoff
1241                                 // bytes. There shouldn't be a legitimate reason for this to happen.
1242                                 wfDebug( __METHOD__ . ": Unmatched XML declaration start\n" );
1243
1244                                 return true;
1245                         }
1246                 }
1247
1248                 return false;
1249         }
1250
1251         /**
1252          * @param string $filename
1253          * @param bool $partial
1254          * @return mixed False of the file is verified (does not contain scripts), array otherwise.
1255          */
1256         protected function detectScriptInSvg( $filename, $partial ) {
1257                 $this->mSVGNSError = false;
1258                 $check = new XmlTypeCheck(
1259                         $filename,
1260                         array( $this, 'checkSvgScriptCallback' ),
1261                         true,
1262                         array( 'processing_instruction_handler' => 'UploadBase::checkSvgPICallback' )
1263                 );
1264                 if ( $check->wellFormed !== true ) {
1265                         // Invalid xml (bug 58553)
1266                         // But only when non-partial (bug 65724)
1267                         return $partial ? false : array( 'uploadinvalidxml' );
1268                 } elseif ( $check->filterMatch ) {
1269                         if ( $this->mSVGNSError ) {
1270                                 return array( 'uploadscriptednamespace', $this->mSVGNSError );
1271                         }
1272
1273                         return array( 'uploadscripted' );
1274                 }
1275
1276                 return false;
1277         }
1278
1279         /**
1280          * Callback to filter SVG Processing Instructions.
1281          * @param string $target Processing instruction name
1282          * @param string $data Processing instruction attribute and value
1283          * @return bool (true if the filter identified something bad)
1284          */
1285         public static function checkSvgPICallback( $target, $data ) {
1286                 // Don't allow external stylesheets (bug 57550)
1287                 if ( preg_match( '/xml-stylesheet/i', $target ) ) {
1288                         return true;
1289                 }
1290
1291                 return false;
1292         }
1293
1294         /**
1295          * @todo Replace this with a whitelist filter!
1296          * @param string $element
1297          * @param array $attribs
1298          * @return bool
1299          */
1300         public function checkSvgScriptCallback( $element, $attribs, $data = null ) {
1301
1302                 list( $namespace, $strippedElement ) = $this->splitXmlNamespace( $element );
1303
1304                 // We specifically don't include:
1305                 // http://www.w3.org/1999/xhtml (bug 60771)
1306                 static $validNamespaces = array(
1307                         '',
1308                         'adobe:ns:meta/',
1309                         'http://creativecommons.org/ns#',
1310                         'http://inkscape.sourceforge.net/dtd/sodipodi-0.dtd',
1311                         'http://ns.adobe.com/adobeillustrator/10.0/',
1312                         'http://ns.adobe.com/adobesvgviewerextensions/3.0/',
1313                         'http://ns.adobe.com/extensibility/1.0/',
1314                         'http://ns.adobe.com/flows/1.0/',
1315                         'http://ns.adobe.com/illustrator/1.0/',
1316                         'http://ns.adobe.com/imagereplacement/1.0/',
1317                         'http://ns.adobe.com/pdf/1.3/',
1318                         'http://ns.adobe.com/photoshop/1.0/',
1319                         'http://ns.adobe.com/saveforweb/1.0/',
1320                         'http://ns.adobe.com/variables/1.0/',
1321                         'http://ns.adobe.com/xap/1.0/',
1322                         'http://ns.adobe.com/xap/1.0/g/',
1323                         'http://ns.adobe.com/xap/1.0/g/img/',
1324                         'http://ns.adobe.com/xap/1.0/mm/',
1325                         'http://ns.adobe.com/xap/1.0/rights/',
1326                         'http://ns.adobe.com/xap/1.0/stype/dimensions#',
1327                         'http://ns.adobe.com/xap/1.0/stype/font#',
1328                         'http://ns.adobe.com/xap/1.0/stype/manifestitem#',
1329                         'http://ns.adobe.com/xap/1.0/stype/resourceevent#',
1330                         'http://ns.adobe.com/xap/1.0/stype/resourceref#',
1331                         'http://ns.adobe.com/xap/1.0/t/pg/',
1332                         'http://purl.org/dc/elements/1.1/',
1333                         'http://purl.org/dc/elements/1.1',
1334                         'http://schemas.microsoft.com/visio/2003/svgextensions/',
1335                         'http://sodipodi.sourceforge.net/dtd/sodipodi-0.dtd',
1336                         'http://taptrix.com/inkpad/svg_extensions',
1337                         'http://web.resource.org/cc/',
1338                         'http://www.freesoftware.fsf.org/bkchem/cdml',
1339                         'http://www.inkscape.org/namespaces/inkscape',
1340                         'http://www.opengis.net/gml',
1341                         'http://www.w3.org/1999/02/22-rdf-syntax-ns#',
1342                         'http://www.w3.org/2000/svg',
1343                         'http://www.w3.org/tr/rec-rdf-syntax/',
1344                 );
1345
1346                 if ( !in_array( $namespace, $validNamespaces ) ) {
1347                         wfDebug( __METHOD__ . ": Non-svg namespace '$namespace' in uploaded file.\n" );
1348                         /** @todo Return a status object to a closure in XmlTypeCheck, for MW1.21+ */
1349                         $this->mSVGNSError = $namespace;
1350
1351                         return true;
1352                 }
1353
1354                 /*
1355                  * check for elements that can contain javascript
1356                  */
1357                 if ( $strippedElement == 'script' ) {
1358                         wfDebug( __METHOD__ . ": Found script element '$element' in uploaded file.\n" );
1359
1360                         return true;
1361                 }
1362
1363                 # e.g., <svg xmlns="http://www.w3.org/2000/svg">
1364                 #  <handler xmlns:ev="http://www.w3.org/2001/xml-events" ev:event="load">alert(1)</handler> </svg>
1365                 if ( $strippedElement == 'handler' ) {
1366                         wfDebug( __METHOD__ . ": Found scriptable element '$element' in uploaded file.\n" );
1367
1368                         return true;
1369                 }
1370
1371                 # SVG reported in Feb '12 that used xml:stylesheet to generate javascript block
1372                 if ( $strippedElement == 'stylesheet' ) {
1373                         wfDebug( __METHOD__ . ": Found scriptable element '$element' in uploaded file.\n" );
1374
1375                         return true;
1376                 }
1377
1378                 # Block iframes, in case they pass the namespace check
1379                 if ( $strippedElement == 'iframe' ) {
1380                         wfDebug( __METHOD__ . ": iframe in uploaded file.\n" );
1381
1382                         return true;
1383                 }
1384
1385                 # Check <style> css
1386                 if ( $strippedElement == 'style'
1387                         && self::checkCssFragment( Sanitizer::normalizeCss( $data ) )
1388                 ) {
1389                         wfDebug( __METHOD__ . ": hostile css in style element.\n" );
1390                         return true;
1391                 }
1392
1393                 foreach ( $attribs as $attrib => $value ) {
1394                         $stripped = $this->stripXmlNamespace( $attrib );
1395                         $value = strtolower( $value );
1396
1397                         if ( substr( $stripped, 0, 2 ) == 'on' ) {
1398                                 wfDebug( __METHOD__
1399                                         . ": Found event-handler attribute '$attrib'='$value' in uploaded file.\n" );
1400
1401                                 return true;
1402                         }
1403
1404                         # href with non-local target (don't allow http://, javascript:, etc)
1405                         if ( $stripped == 'href'
1406                                 && strpos( $value, 'data:' ) !== 0
1407                                 && strpos( $value, '#' ) !== 0
1408                         ) {
1409                                 if ( !( $strippedElement === 'a'
1410                                         && preg_match( '!^https?://!im', $value ) )
1411                                 ) {
1412                                         wfDebug( __METHOD__ . ": Found href attribute <$strippedElement "
1413                                                 . "'$attrib'='$value' in uploaded file.\n" );
1414
1415                                         return true;
1416                                 }
1417                         }
1418
1419                         # href with embedded svg as target
1420                         if ( $stripped == 'href' && preg_match( '!data:[^,]*image/svg[^,]*,!sim', $value ) ) {
1421                                 wfDebug( __METHOD__ . ": Found href to embedded svg "
1422                                         . "\"<$strippedElement '$attrib'='$value'...\" in uploaded file.\n" );
1423
1424                                 return true;
1425                         }
1426
1427                         # href with embedded (text/xml) svg as target
1428                         if ( $stripped == 'href' && preg_match( '!data:[^,]*text/xml[^,]*,!sim', $value ) ) {
1429                                 wfDebug( __METHOD__ . ": Found href to embedded svg "
1430                                         . "\"<$strippedElement '$attrib'='$value'...\" in uploaded file.\n" );
1431
1432                                 return true;
1433                         }
1434
1435                         # Change href with animate from (http://html5sec.org/#137). This doesn't seem
1436                         # possible without embedding the svg, but filter here in case.
1437                         if ( $stripped == 'from'
1438                                 && $strippedElement === 'animate'
1439                                 && !preg_match( '!^https?://!im', $value )
1440                         ) {
1441                                 wfDebug( __METHOD__ . ": Found animate that might be changing href using from "
1442                                         . "\"<$strippedElement '$attrib'='$value'...\" in uploaded file.\n" );
1443
1444                                 return true;
1445                         }
1446
1447                         # use set/animate to add event-handler attribute to parent
1448                         if ( ( $strippedElement == 'set' || $strippedElement == 'animate' )
1449                                 && $stripped == 'attributename'
1450                                 && substr( $value, 0, 2 ) == 'on'
1451                         ) {
1452                                 wfDebug( __METHOD__ . ": Found svg setting event-handler attribute with "
1453                                         . "\"<$strippedElement $stripped='$value'...\" in uploaded file.\n" );
1454
1455                                 return true;
1456                         }
1457
1458                         # use set to add href attribute to parent element
1459                         if ( $strippedElement == 'set'
1460                                 && $stripped == 'attributename'
1461                                 && strpos( $value, 'href' ) !== false
1462                         ) {
1463                                 wfDebug( __METHOD__ . ": Found svg setting href attribute '$value' in uploaded file.\n" );
1464
1465                                 return true;
1466                         }
1467
1468                         # use set to add a remote / data / script target to an element
1469                         if ( $strippedElement == 'set'
1470                                 && $stripped == 'to'
1471                                 && preg_match( '!(http|https|data|script):!sim', $value )
1472                         ) {
1473                                 wfDebug( __METHOD__ . ": Found svg setting attribute to '$value' in uploaded file.\n" );
1474
1475                                 return true;
1476                         }
1477
1478                         # use handler attribute with remote / data / script
1479                         if ( $stripped == 'handler' && preg_match( '!(http|https|data|script):!sim', $value ) ) {
1480                                 wfDebug( __METHOD__ . ": Found svg setting handler with remote/data/script "
1481                                         . "'$attrib'='$value' in uploaded file.\n" );
1482
1483                                 return true;
1484                         }
1485
1486                         # use CSS styles to bring in remote code
1487                         if ( $stripped == 'style'
1488                                 && self::checkCssFragment( Sanitizer::normalizeCss( $value ) )
1489                         ) {
1490                                 wfDebug( __METHOD__ . ": Found svg setting a style with "
1491                                         . "remote url '$attrib'='$value' in uploaded file.\n" );
1492                                 return true;
1493                         }
1494
1495                         # Several attributes can include css, css character escaping isn't allowed
1496                         $cssAttrs = array( 'font', 'clip-path', 'fill', 'filter', 'marker',
1497                                 'marker-end', 'marker-mid', 'marker-start', 'mask', 'stroke' );
1498                         if ( in_array( $stripped, $cssAttrs )
1499                                 && self::checkCssFragment( $value )
1500                         ) {
1501                                 wfDebug( __METHOD__ . ": Found svg setting a style with "
1502                                         . "remote url '$attrib'='$value' in uploaded file.\n" );
1503                                 return true;
1504                         }
1505
1506                         # image filters can pull in url, which could be svg that executes scripts
1507                         if ( $strippedElement == 'image'
1508                                 && $stripped == 'filter'
1509                                 && preg_match( '!url\s*\(!sim', $value )
1510                         ) {
1511                                 wfDebug( __METHOD__ . ": Found image filter with url: "
1512                                         . "\"<$strippedElement $stripped='$value'...\" in uploaded file.\n" );
1513
1514                                 return true;
1515                         }
1516                 }
1517
1518                 return false; //No scripts detected
1519         }
1520
1521         /**
1522          * Check a block of CSS or CSS fragment for anything that looks like
1523          * it is bringing in remote code.
1524          * @param string $value a string of CSS
1525          * @param bool $propOnly only check css properties (start regex with :)
1526          * @return bool true if the CSS contains an illegal string, false if otherwise
1527          */
1528         private static function checkCssFragment( $value ) {
1529
1530                 # Forbid external stylesheets, for both reliability and to protect viewer's privacy
1531                 if ( strpos( $value, '@import' ) !== false ) {
1532                         return true;
1533                 }
1534
1535                 # We allow @font-face to embed fonts with data: urls, so we snip the string
1536                 # 'url' out so this case won't match when we check for urls below
1537                 $pattern = '!(@font-face\s*{[^}]*src:)url(\("data:;base64,)!im';
1538                 $value = preg_replace( $pattern, '$1$2', $value );
1539
1540                 # Check for remote and executable CSS. Unlike in Sanitizer::checkCss, the CSS
1541                 # properties filter and accelerator don't seem to be useful for xss in SVG files.
1542                 # Expression and -o-link don't seem to work either, but filtering them here in case.
1543                 # Additionally, we catch remote urls like url("http:..., url('http:..., url(http:...,
1544                 # but not local ones such as url("#..., url('#..., url(#....
1545                 if ( preg_match( '!expression
1546                                 | -o-link\s*:
1547                                 | -o-link-source\s*:
1548                                 | -o-replace\s*:!imx', $value ) ) {
1549                         return true;
1550                 }
1551
1552                 if ( preg_match_all(
1553                                 "!(\s*(url|image|image-set)\s*\(\s*[\"']?\s*[^#]+.*?\))!sim",
1554                                 $value,
1555                                 $matches
1556                         ) !== 0
1557                 ) {
1558                         # TODO: redo this in one regex. Until then, url("#whatever") matches the first
1559                         foreach ( $matches[1] as $match ) {
1560                                 if ( !preg_match( "!\s*(url|image|image-set)\s*\(\s*(#|'#|\"#)!im", $match ) ) {
1561                                         return true;
1562                                 }
1563                         }
1564                 }
1565
1566                 if ( preg_match( '/[\000-\010\013\016-\037\177]/', $value ) ) {
1567                         return true;
1568                 }
1569
1570                 return false;
1571         }
1572
1573         /**
1574          * Divide the element name passed by the xml parser to the callback into URI and prifix.
1575          * @param string $element
1576          * @return array Containing the namespace URI and prefix
1577          */
1578         private static function splitXmlNamespace( $element ) {
1579                 // 'http://www.w3.org/2000/svg:script' -> array( 'http://www.w3.org/2000/svg', 'script' )
1580                 $parts = explode( ':', strtolower( $element ) );
1581                 $name = array_pop( $parts );
1582                 $ns = implode( ':', $parts );
1583
1584                 return array( $ns, $name );
1585         }
1586
1587         /**
1588          * @param string $name
1589          * @return string
1590          */
1591         private function stripXmlNamespace( $name ) {
1592                 // 'http://www.w3.org/2000/svg:script' -> 'script'
1593                 $parts = explode( ':', strtolower( $name ) );
1594
1595                 return array_pop( $parts );
1596         }
1597
1598         /**
1599          * Generic wrapper function for a virus scanner program.
1600          * This relies on the $wgAntivirus and $wgAntivirusSetup variables.
1601          * $wgAntivirusRequired may be used to deny upload if the scan fails.
1602          *
1603          * @param string $file Pathname to the temporary upload file
1604          * @return mixed False if not virus is found, null if the scan fails or is disabled,
1605          *   or a string containing feedback from the virus scanner if a virus was found.
1606          *   If textual feedback is missing but a virus was found, this function returns true.
1607          */
1608         public static function detectVirus( $file ) {
1609                 global $wgAntivirus, $wgAntivirusSetup, $wgAntivirusRequired, $wgOut;
1610
1611                 if ( !$wgAntivirus ) {
1612                         wfDebug( __METHOD__ . ": virus scanner disabled\n" );
1613
1614                         return null;
1615                 }
1616
1617                 if ( !$wgAntivirusSetup[$wgAntivirus] ) {
1618                         wfDebug( __METHOD__ . ": unknown virus scanner: $wgAntivirus\n" );
1619                         $wgOut->wrapWikiMsg( "<div class=\"error\">\n$1\n</div>",
1620                                 array( 'virus-badscanner', $wgAntivirus ) );
1621
1622                         return wfMessage( 'virus-unknownscanner' )->text() . " $wgAntivirus";
1623                 }
1624
1625                 # look up scanner configuration
1626                 $command = $wgAntivirusSetup[$wgAntivirus]['command'];
1627                 $exitCodeMap = $wgAntivirusSetup[$wgAntivirus]['codemap'];
1628                 $msgPattern = isset( $wgAntivirusSetup[$wgAntivirus]['messagepattern'] ) ?
1629                         $wgAntivirusSetup[$wgAntivirus]['messagepattern'] : null;
1630
1631                 if ( strpos( $command, "%f" ) === false ) {
1632                         # simple pattern: append file to scan
1633                         $command .= " " . wfEscapeShellArg( $file );
1634                 } else {
1635                         # complex pattern: replace "%f" with file to scan
1636                         $command = str_replace( "%f", wfEscapeShellArg( $file ), $command );
1637                 }
1638
1639                 wfDebug( __METHOD__ . ": running virus scan: $command \n" );
1640
1641                 # execute virus scanner
1642                 $exitCode = false;
1643
1644                 # NOTE: there's a 50 line workaround to make stderr redirection work on windows, too.
1645                 #      that does not seem to be worth the pain.
1646                 #      Ask me (Duesentrieb) about it if it's ever needed.
1647                 $output = wfShellExecWithStderr( $command, $exitCode );
1648
1649                 # map exit code to AV_xxx constants.
1650                 $mappedCode = $exitCode;
1651                 if ( $exitCodeMap ) {
1652                         if ( isset( $exitCodeMap[$exitCode] ) ) {
1653                                 $mappedCode = $exitCodeMap[$exitCode];
1654                         } elseif ( isset( $exitCodeMap["*"] ) ) {
1655                                 $mappedCode = $exitCodeMap["*"];
1656                         }
1657                 }
1658
1659                 /* NB: AV_NO_VIRUS is 0 but AV_SCAN_FAILED is false,
1660                  * so we need the strict equalities === and thus can't use a switch here
1661                  */
1662                 if ( $mappedCode === AV_SCAN_FAILED ) {
1663                         # scan failed (code was mapped to false by $exitCodeMap)
1664                         wfDebug( __METHOD__ . ": failed to scan $file (code $exitCode).\n" );
1665
1666                         $output = $wgAntivirusRequired
1667                                 ? wfMessage( 'virus-scanfailed', array( $exitCode ) )->text()
1668                                 : null;
1669                 } elseif ( $mappedCode === AV_SCAN_ABORTED ) {
1670                         # scan failed because filetype is unknown (probably imune)
1671                         wfDebug( __METHOD__ . ": unsupported file type $file (code $exitCode).\n" );
1672                         $output = null;
1673                 } elseif ( $mappedCode === AV_NO_VIRUS ) {
1674                         # no virus found
1675                         wfDebug( __METHOD__ . ": file passed virus scan.\n" );
1676                         $output = false;
1677                 } else {
1678                         $output = trim( $output );
1679
1680                         if ( !$output ) {
1681                                 $output = true; #if there's no output, return true
1682                         } elseif ( $msgPattern ) {
1683                                 $groups = array();
1684                                 if ( preg_match( $msgPattern, $output, $groups ) ) {
1685                                         if ( $groups[1] ) {
1686                                                 $output = $groups[1];
1687                                         }
1688                                 }
1689                         }
1690
1691                         wfDebug( __METHOD__ . ": FOUND VIRUS! scanner feedback: $output \n" );
1692                 }
1693
1694
1695                 return $output;
1696         }
1697
1698         /**
1699          * Check if there's an overwrite conflict and, if so, if restrictions
1700          * forbid this user from performing the upload.
1701          *
1702          * @param User $user
1703          *
1704          * @return mixed True on success, array on failure
1705          */
1706         private function checkOverwrite( $user ) {
1707                 // First check whether the local file can be overwritten
1708                 $file = $this->getLocalFile();
1709                 if ( $file->exists() ) {
1710                         if ( !self::userCanReUpload( $user, $file ) ) {
1711                                 return array( 'fileexists-forbidden', $file->getName() );
1712                         } else {
1713                                 return true;
1714                         }
1715                 }
1716
1717                 /* Check shared conflicts: if the local file does not exist, but
1718                  * wfFindFile finds a file, it exists in a shared repository.
1719                  */
1720                 $file = wfFindFile( $this->getTitle() );
1721                 if ( $file && !$user->isAllowed( 'reupload-shared' ) ) {
1722                         return array( 'fileexists-shared-forbidden', $file->getName() );
1723                 }
1724
1725                 return true;
1726         }
1727
1728         /**
1729          * Check if a user is the last uploader
1730          *
1731          * @param User $user
1732          * @param string $img Image name
1733          * @return bool
1734          */
1735         public static function userCanReUpload( User $user, $img ) {
1736                 if ( $user->isAllowed( 'reupload' ) ) {
1737                         return true; // non-conditional
1738                 }
1739                 if ( !$user->isAllowed( 'reupload-own' ) ) {
1740                         return false;
1741                 }
1742                 if ( is_string( $img ) ) {
1743                         $img = wfLocalFile( $img );
1744                 }
1745                 if ( !( $img instanceof LocalFile ) ) {
1746                         return false;
1747                 }
1748
1749                 return $user->getId() == $img->getUser( 'id' );
1750         }
1751
1752         /**
1753          * Helper function that does various existence checks for a file.
1754          * The following checks are performed:
1755          * - The file exists
1756          * - Article with the same name as the file exists
1757          * - File exists with normalized extension
1758          * - The file looks like a thumbnail and the original exists
1759          *
1760          * @param File $file The File object to check
1761          * @return mixed False if the file does not exists, else an array
1762          */
1763         public static function getExistsWarning( $file ) {
1764                 if ( $file->exists() ) {
1765                         return array( 'warning' => 'exists', 'file' => $file );
1766                 }
1767
1768                 if ( $file->getTitle()->getArticleID() ) {
1769                         return array( 'warning' => 'page-exists', 'file' => $file );
1770                 }
1771
1772                 if ( $file->wasDeleted() && !$file->exists() ) {
1773                         return array( 'warning' => 'was-deleted', 'file' => $file );
1774                 }
1775
1776                 if ( strpos( $file->getName(), '.' ) == false ) {
1777                         $partname = $file->getName();
1778                         $extension = '';
1779                 } else {
1780                         $n = strrpos( $file->getName(), '.' );
1781                         $extension = substr( $file->getName(), $n + 1 );
1782                         $partname = substr( $file->getName(), 0, $n );
1783                 }
1784                 $normalizedExtension = File::normalizeExtension( $extension );
1785
1786                 if ( $normalizedExtension != $extension ) {
1787                         // We're not using the normalized form of the extension.
1788                         // Normal form is lowercase, using most common of alternate
1789                         // extensions (eg 'jpg' rather than 'JPEG').
1790                         //
1791                         // Check for another file using the normalized form...
1792                         $nt_lc = Title::makeTitle( NS_FILE, "{$partname}.{$normalizedExtension}" );
1793                         $file_lc = wfLocalFile( $nt_lc );
1794
1795                         if ( $file_lc->exists() ) {
1796                                 return array(
1797                                         'warning' => 'exists-normalized',
1798                                         'file' => $file,
1799                                         'normalizedFile' => $file_lc
1800                                 );
1801                         }
1802                 }
1803
1804                 // Check for files with the same name but a different extension
1805                 $similarFiles = RepoGroup::singleton()->getLocalRepo()->findFilesByPrefix(
1806                         "{$partname}.", 1 );
1807                 if ( count( $similarFiles ) ) {
1808                         return array(
1809                                 'warning' => 'exists-normalized',
1810                                 'file' => $file,
1811                                 'normalizedFile' => $similarFiles[0],
1812                         );
1813                 }
1814
1815                 if ( self::isThumbName( $file->getName() ) ) {
1816                         # Check for filenames like 50px- or 180px-, these are mostly thumbnails
1817                         $nt_thb = Title::newFromText(
1818                                 substr( $partname, strpos( $partname, '-' ) + 1 ) . '.' . $extension,
1819                                 NS_FILE
1820                         );
1821                         $file_thb = wfLocalFile( $nt_thb );
1822                         if ( $file_thb->exists() ) {
1823                                 return array(
1824                                         'warning' => 'thumb',
1825                                         'file' => $file,
1826                                         'thumbFile' => $file_thb
1827                                 );
1828                         } else {
1829                                 // File does not exist, but we just don't like the name
1830                                 return array(
1831                                         'warning' => 'thumb-name',
1832                                         'file' => $file,
1833                                         'thumbFile' => $file_thb
1834                                 );
1835                         }
1836                 }
1837
1838                 foreach ( self::getFilenamePrefixBlacklist() as $prefix ) {
1839                         if ( substr( $partname, 0, strlen( $prefix ) ) == $prefix ) {
1840                                 return array(
1841                                         'warning' => 'bad-prefix',
1842                                         'file' => $file,
1843                                         'prefix' => $prefix
1844                                 );
1845                         }
1846                 }
1847
1848                 return false;
1849         }
1850
1851         /**
1852          * Helper function that checks whether the filename looks like a thumbnail
1853          * @param string $filename
1854          * @return bool
1855          */
1856         public static function isThumbName( $filename ) {
1857                 $n = strrpos( $filename, '.' );
1858                 $partname = $n ? substr( $filename, 0, $n ) : $filename;
1859
1860                 return (
1861                         substr( $partname, 3, 3 ) == 'px-' ||
1862                         substr( $partname, 2, 3 ) == 'px-'
1863                 ) &&
1864                 preg_match( "/[0-9]{2}/", substr( $partname, 0, 2 ) );
1865         }
1866
1867         /**
1868          * Get a list of blacklisted filename prefixes from [[MediaWiki:Filename-prefix-blacklist]]
1869          *
1870          * @return array List of prefixes
1871          */
1872         public static function getFilenamePrefixBlacklist() {
1873                 $blacklist = array();
1874                 $message = wfMessage( 'filename-prefix-blacklist' )->inContentLanguage();
1875                 if ( !$message->isDisabled() ) {
1876                         $lines = explode( "\n", $message->plain() );
1877                         foreach ( $lines as $line ) {
1878                                 // Remove comment lines
1879                                 $comment = substr( trim( $line ), 0, 1 );
1880                                 if ( $comment == '#' || $comment == '' ) {
1881                                         continue;
1882                                 }
1883                                 // Remove additional comments after a prefix
1884                                 $comment = strpos( $line, '#' );
1885                                 if ( $comment > 0 ) {
1886                                         $line = substr( $line, 0, $comment - 1 );
1887                                 }
1888                                 $blacklist[] = trim( $line );
1889                         }
1890                 }
1891
1892                 return $blacklist;
1893         }
1894
1895         /**
1896          * Gets image info about the file just uploaded.
1897          *
1898          * Also has the effect of setting metadata to be an 'indexed tag name' in
1899          * returned API result if 'metadata' was requested. Oddly, we have to pass
1900          * the "result" object down just so it can do that with the appropriate
1901          * format, presumably.
1902          *
1903          * @param ApiResult $result
1904          * @return array Image info
1905          */
1906         public function getImageInfo( $result ) {
1907                 $file = $this->getLocalFile();
1908                 /** @todo This cries out for refactoring.
1909                  *  We really want to say $file->getAllInfo(); here.
1910                  * Perhaps "info" methods should be moved into files, and the API should
1911                  * just wrap them in queries.
1912                  */
1913                 if ( $file instanceof UploadStashFile ) {
1914                         $imParam = ApiQueryStashImageInfo::getPropertyNames();
1915                         $info = ApiQueryStashImageInfo::getInfo( $file, array_flip( $imParam ), $result );
1916                 } else {
1917                         $imParam = ApiQueryImageInfo::getPropertyNames();
1918                         $info = ApiQueryImageInfo::getInfo( $file, array_flip( $imParam ), $result );
1919                 }
1920
1921                 return $info;
1922         }
1923
1924         /**
1925          * @param array $error
1926          * @return Status
1927          */
1928         public function convertVerifyErrorToStatus( $error ) {
1929                 $code = $error['status'];
1930                 unset( $code['status'] );
1931
1932                 return Status::newFatal( $this->getVerificationErrorCode( $code ), $error );
1933         }
1934
1935         /**
1936          * @param null|string $forType
1937          * @return int
1938          */
1939         public static function getMaxUploadSize( $forType = null ) {
1940                 global $wgMaxUploadSize;
1941
1942                 if ( is_array( $wgMaxUploadSize ) ) {
1943                         if ( !is_null( $forType ) && isset( $wgMaxUploadSize[$forType] ) ) {
1944                                 return $wgMaxUploadSize[$forType];
1945                         } else {
1946                                 return $wgMaxUploadSize['*'];
1947                         }
1948                 } else {
1949                         return intval( $wgMaxUploadSize );
1950                 }
1951         }
1952
1953         /**
1954          * Get the current status of a chunked upload (used for polling)
1955          *
1956          * The value will be read from cache.
1957          *
1958          * @param User $user
1959          * @param string $statusKey
1960          * @return Status[]|bool
1961          */
1962         public static function getSessionStatus( User $user, $statusKey ) {
1963                 $key = wfMemcKey( 'uploadstatus', $user->getId() ?: md5( $user->getName() ), $statusKey );
1964
1965                 return wfGetCache( CACHE_ANYTHING )->get( $key );
1966         }
1967
1968         /**
1969          * Set the current status of a chunked upload (used for polling)
1970          *
1971          * The value will be set in cache for 1 day
1972          *
1973          * @param User $user
1974          * @param string $statusKey
1975          * @param array|bool $value
1976          * @return void
1977          */
1978         public static function setSessionStatus( User $user, $statusKey, $value ) {
1979                 $key = wfMemcKey( 'uploadstatus', $user->getId() ?: md5( $user->getName() ), $statusKey );
1980
1981                 $cache = wfGetCache( CACHE_ANYTHING );
1982                 if ( $value === false ) {
1983                         $cache->delete( $key );
1984                 } else {
1985                         $cache->set( $key, $value, 86400 );
1986                 }
1987         }
1988 }