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                 wfRunHooks( '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                 wfProfileIn( __METHOD__ );
 265                 $repo = RepoGroup::singleton()->getLocalRepo();
 266                 if ( $repo->isVirtualUrl( $srcPath ) ) {
 267                         /** @todo Just make uploads work with storage paths UploadFromStash
 268                          *  loads files via virtual URLs.
 269                          */
 270                         $tmpFile = $repo->getLocalCopy( $srcPath );
 271                         if ( $tmpFile ) {
 272                                 $tmpFile->bind( $this ); // keep alive with $this
 273                         }
 274                         $path = $tmpFile ? $tmpFile->getPath() : false;
 275                 } else {
 276                         $path = $srcPath;
 277                 }
 278                 wfProfileOut( __METHOD__ );
 279
 280                 return $path;
 281         }
 282
 283         /**
 284          * Verify whether the upload is sane.
 285          * @return mixed Const self::OK or else an array with error information
 286          */
 287         public function verifyUpload() {
 288                 wfProfileIn( __METHOD__ );
 289
 290                 /**
 291                  * If there was no filename or a zero size given, give up quick.
 292                  */
 293                 if ( $this->isEmptyFile() ) {
 294                         wfProfileOut( __METHOD__ );
 295
 296                         return array( 'status' => self::EMPTY_FILE );
 297                 }
 298
 299                 /**
 300                  * Honor $wgMaxUploadSize
 301                  */
 302                 $maxSize = self::getMaxUploadSize( $this->getSourceType() );
 303                 if ( $this->mFileSize > $maxSize ) {
 304                         wfProfileOut( __METHOD__ );
 305
 306                         return array(
 307                                 'status' => self::FILE_TOO_LARGE,
 308                                 'max' => $maxSize,
 309                         );
 310                 }
 311
 312                 /**
 313                  * Look at the contents of the file; if we can recognize the
 314                  * type but it's corrupt or data of the wrong type, we should
 315                  * probably not accept it.
 316                  */
 317                 $verification = $this->verifyFile();
 318                 if ( $verification !== true ) {
 319                         wfProfileOut( __METHOD__ );
 320
 321                         return array(
 322                                 'status' => self::VERIFICATION_ERROR,
 323                                 'details' => $verification
 324                         );
 325                 }
 326
 327                 /**
 328                  * Make sure this file can be created
 329                  */
 330                 $result = $this->validateName();
 331                 if ( $result !== true ) {
 332                         wfProfileOut( __METHOD__ );
 333
 334                         return $result;
 335                 }
 336
 337                 $error = '';
 338                 if ( !wfRunHooks( 'UploadVerification',
 339                         array( $this->mDestName, $this->mTempPath, &$error ) )
 340                 ) {
 341                         wfProfileOut( __METHOD__ );
 342
 343                         return array( 'status' => self::HOOK_ABORTED, 'error' => $error );
 344                 }
 345
 346                 wfProfileOut( __METHOD__ );
 347
 348                 return array( 'status' => self::OK );
 349         }
 350
 351         /**
 352          * Verify that the name is valid and, if necessary, that we can overwrite
 353          *
 354          * @return mixed True if valid, otherwise and array with 'status'
 355          * and other keys
 356          */
 357         public function validateName() {
 358                 $nt = $this->getTitle();
 359                 if ( is_null( $nt ) ) {
 360                         $result = array( 'status' => $this->mTitleError );
 361                         if ( $this->mTitleError == self::ILLEGAL_FILENAME ) {
 362                                 $result['filtered'] = $this->mFilteredName;
 363                         }
 364                         if ( $this->mTitleError == self::FILETYPE_BADTYPE ) {
 365                                 $result['finalExt'] = $this->mFinalExtension;
 366                                 if ( count( $this->mBlackListedExtensions ) ) {
 367                                         $result['blacklistedExt'] = $this->mBlackListedExtensions;
 368                                 }
 369                         }
 370
 371                         return $result;
 372                 }
 373                 $this->mDestName = $this->getLocalFile()->getName();
 374
 375                 return true;
 376         }
 377
 378         /**
 379          * Verify the MIME type.
 380          *
 381          * @note Only checks that it is not an evil MIME. The "does it have
 382          *  correct extension given its MIME type?" check is in verifyFile.
 383          *  in `verifyFile()` that MIME type and file extension correlate.
 384          * @param string $mime Representing the MIME
 385          * @return mixed True if the file is verified, an array otherwise
 386          */
 387         protected function verifyMimeType( $mime ) {
 388                 global $wgVerifyMimeType;
 389                 wfProfileIn( __METHOD__ );
 390                 if ( $wgVerifyMimeType ) {
 391                         wfDebug( "mime: <$mime> extension: <{$this->mFinalExtension}>\n" );
 392                         global $wgMimeTypeBlacklist;
 393                         if ( $this->checkFileExtension( $mime, $wgMimeTypeBlacklist ) ) {
 394                                 wfProfileOut( __METHOD__ );
 395
 396                                 return array( 'filetype-badmime', $mime );
 397                         }
 398
 399                         # Check what Internet Explorer would detect
 400                         $fp = fopen( $this->mTempPath, 'rb' );
 401                         $chunk = fread( $fp, 256 );
 402                         fclose( $fp );
 403
 404                         $magic = MimeMagic::singleton();
 405                         $extMime = $magic->guessTypesForExtension( $this->mFinalExtension );
 406                         $ieTypes = $magic->getIEMimeTypes( $this->mTempPath, $chunk, $extMime );
 407                         foreach ( $ieTypes as $ieType ) {
 408                                 if ( $this->checkFileExtension( $ieType, $wgMimeTypeBlacklist ) ) {
 409                                         wfProfileOut( __METHOD__ );
 410
 411                                         return array( 'filetype-bad-ie-mime', $ieType );
 412                                 }
 413                         }
 414                 }
 415
 416                 wfProfileOut( __METHOD__ );
 417
 418                 return true;
 419         }
 420
 421         /**
 422          * Verifies that it's ok to include the uploaded file
 423          *
 424          * @return mixed True of the file is verified, array otherwise.
 425          */
 426         protected function verifyFile() {
 427                 global $wgVerifyMimeType;
 428                 wfProfileIn( __METHOD__ );
 429
 430                 $status = $this->verifyPartialFile();
 431                 if ( $status !== true ) {
 432                         wfProfileOut( __METHOD__ );
 433
 434                         return $status;
 435                 }
 436
 437                 $this->mFileProps = FSFile::getPropsFromPath( $this->mTempPath, $this->mFinalExtension );
 438                 $mime = $this->mFileProps['mime'];
 439
 440                 if ( $wgVerifyMimeType ) {
 441                         # XXX: Missing extension will be caught by validateName() via getTitle()
 442                         if ( $this->mFinalExtension != '' && !$this->verifyExtension( $mime, $this->mFinalExtension ) ) {
 443                                 wfProfileOut( __METHOD__ );
 444
 445                                 return array( 'filetype-mime-mismatch', $this->mFinalExtension, $mime );
 446                         }
 447                 }
 448
 449                 $handler = MediaHandler::getHandler( $mime );
 450                 if ( $handler ) {
 451                         $handlerStatus = $handler->verifyUpload( $this->mTempPath );
 452                         if ( !$handlerStatus->isOK() ) {
 453                                 $errors = $handlerStatus->getErrorsArray();
 454                                 wfProfileOut( __METHOD__ );
 455
 456                                 return reset( $errors );
 457                         }
 458                 }
 459
 460                 wfRunHooks( 'UploadVerifyFile', array( $this, $mime, &$status ) );
 461                 if ( $status !== true ) {
 462                         wfProfileOut( __METHOD__ );
 463
 464                         return $status;
 465                 }
 466
 467                 wfDebug( __METHOD__ . ": all clear; passing.\n" );
 468                 wfProfileOut( __METHOD__ );
 469
 470                 return true;
 471         }
 472
 473         /**
 474          * A verification routine suitable for partial files
 475          *
 476          * Runs the blacklist checks, but not any checks that may
 477          * assume the entire file is present.
 478          *
 479          * @return mixed True for valid or array with error message key.
 480          */
 481         protected function verifyPartialFile() {
 482                 global $wgAllowJavaUploads, $wgDisableUploadScriptChecks;
 483                 wfProfileIn( __METHOD__ );
 484
 485                 # getTitle() sets some internal parameters like $this->mFinalExtension
 486                 $this->getTitle();
 487
 488                 $this->mFileProps = FSFile::getPropsFromPath( $this->mTempPath, $this->mFinalExtension );
 489
 490                 # check MIME type, if desired
 491                 $mime = $this->mFileProps['file-mime'];
 492                 $status = $this->verifyMimeType( $mime );
 493                 if ( $status !== true ) {
 494                         wfProfileOut( __METHOD__ );
 495
 496                         return $status;
 497                 }
 498
 499                 # check for htmlish code and javascript
 500                 if ( !$wgDisableUploadScriptChecks ) {
 501                         if ( self::detectScript( $this->mTempPath, $mime, $this->mFinalExtension ) ) {
 502                                 wfProfileOut( __METHOD__ );
 503
 504                                 return array( 'uploadscripted' );
 505                         }
 506                         if ( $this->mFinalExtension == 'svg' || $mime == 'image/svg+xml' ) {
 507                                 $svgStatus = $this->detectScriptInSvg( $this->mTempPath );
 508                                 if ( $svgStatus !== false ) {
 509                                         wfProfileOut( __METHOD__ );
 510
 511                                         return $svgStatus;
 512                                 }
 513                         }
 514                 }
 515
 516                 # Check for Java applets, which if uploaded can bypass cross-site
 517                 # restrictions.
 518                 if ( !$wgAllowJavaUploads ) {
 519                         $this->mJavaDetected = false;
 520                         $zipStatus = ZipDirectoryReader::read( $this->mTempPath,
 521                                 array( $this, 'zipEntryCallback' ) );
 522                         if ( !$zipStatus->isOK() ) {
 523                                 $errors = $zipStatus->getErrorsArray();
 524                                 $error = reset( $errors );
 525                                 if ( $error[0] !== 'zip-wrong-format' ) {
 526                                         wfProfileOut( __METHOD__ );
 527
 528                                         return $error;
 529                                 }
 530                         }
 531                         if ( $this->mJavaDetected ) {
 532                                 wfProfileOut( __METHOD__ );
 533
 534                                 return array( 'uploadjava' );
 535                         }
 536                 }
 537
 538                 # Scan the uploaded file for viruses
 539                 $virus = $this->detectVirus( $this->mTempPath );
 540                 if ( $virus ) {
 541                         wfProfileOut( __METHOD__ );
 542
 543                         return array( 'uploadvirus', $virus );
 544                 }
 545
 546                 wfProfileOut( __METHOD__ );
 547
 548                 return true;
 549         }
 550
 551         /**
 552          * Callback for ZipDirectoryReader to detect Java class files.
 553          *
 554          * @param array $entry
 555          */
 556         function zipEntryCallback( $entry ) {
 557                 $names = array( $entry['name'] );
 558
 559                 // If there is a null character, cut off the name at it, because JDK's
 560                 // ZIP_GetEntry() uses strcmp() if the name hashes match. If a file name
 561                 // were constructed which had ".class\0" followed by a string chosen to
 562                 // make the hash collide with the truncated name, that file could be
 563                 // returned in response to a request for the .class file.
 564                 $nullPos = strpos( $entry['name'], "\000" );
 565                 if ( $nullPos !== false ) {
 566                         $names[] = substr( $entry['name'], 0, $nullPos );
 567                 }
 568
 569                 // If there is a trailing slash in the file name, we have to strip it,
 570                 // because that's what ZIP_GetEntry() does.
 571                 if ( preg_grep( '!\.class/?$!', $names ) ) {
 572                         $this->mJavaDetected = true;
 573                 }
 574         }
 575
 576         /**
 577          * Alias for verifyTitlePermissions. The function was originally
 578          * 'verifyPermissions', but that suggests it's checking the user, when it's
 579          * really checking the title + user combination.
 580          *
 581          * @param User $user User object to verify the permissions against
 582          * @return mixed An array as returned by getUserPermissionsErrors or true
 583          *   in case the user has proper permissions.
 584          */
 585         public function verifyPermissions( $user ) {
 586                 return $this->verifyTitlePermissions( $user );
 587         }
 588
 589         /**
 590          * Check whether the user can edit, upload and create the image. This
 591          * checks only against the current title; if it returns errors, it may
 592          * very well be that another title will not give errors. Therefore
 593          * isAllowed() should be called as well for generic is-user-blocked or
 594          * can-user-upload checking.
 595          *
 596          * @param User $user User object to verify the permissions against
 597          * @return mixed An array as returned by getUserPermissionsErrors or true
 598          *   in case the user has proper permissions.
 599          */
 600         public function verifyTitlePermissions( $user ) {
 601                 /**
 602                  * If the image is protected, non-sysop users won't be able
 603                  * to modify it by uploading a new revision.
 604                  */
 605                 $nt = $this->getTitle();
 606                 if ( is_null( $nt ) ) {
 607                         return true;
 608                 }
 609                 $permErrors = $nt->getUserPermissionsErrors( 'edit', $user );
 610                 $permErrorsUpload = $nt->getUserPermissionsErrors( 'upload', $user );
 611                 if ( !$nt->exists() ) {
 612                         $permErrorsCreate = $nt->getUserPermissionsErrors( 'create', $user );
 613                 } else {
 614                         $permErrorsCreate = array();
 615                 }
 616                 if ( $permErrors || $permErrorsUpload || $permErrorsCreate ) {
 617                         $permErrors = array_merge( $permErrors, wfArrayDiff2( $permErrorsUpload, $permErrors ) );
 618                         $permErrors = array_merge( $permErrors, wfArrayDiff2( $permErrorsCreate, $permErrors ) );
 619
 620                         return $permErrors;
 621                 }
 622
 623                 $overwriteError = $this->checkOverwrite( $user );
 624                 if ( $overwriteError !== true ) {
 625                         return array( $overwriteError );
 626                 }
 627
 628                 return true;
 629         }
 630
 631         /**
 632          * Check for non fatal problems with the file.
 633          *
 634          * This should not assume that mTempPath is set.
 635          *
 636          * @return array Array of warnings
 637          */
 638         public function checkWarnings() {
 639                 global $wgLang;
 640                 wfProfileIn( __METHOD__ );
 641
 642                 $warnings = array();
 643
 644                 $localFile = $this->getLocalFile();
 645                 $filename = $localFile->getName();
 646
 647                 /**
 648                  * Check whether the resulting filename is different from the desired one,
 649                  * but ignore things like ucfirst() and spaces/underscore things
 650                  */
 651                 $comparableName = str_replace( ' ', '_', $this->mDesiredDestName );
 652                 $comparableName = Title::capitalize( $comparableName, NS_FILE );
 653
 654                 if ( $this->mDesiredDestName != $filename && $comparableName != $filename ) {
 655                         $warnings['badfilename'] = $filename;
 656                         // Debugging for bug 62241
 657                         wfDebugLog( 'upload', "Filename: '$filename', mDesiredDestName: "
 658                                 . "'$this->mDesiredDestName', comparableName: '$comparableName'" );
 659                 }
 660
 661                 // Check whether the file extension is on the unwanted list
 662                 global $wgCheckFileExtensions, $wgFileExtensions;
 663                 if ( $wgCheckFileExtensions ) {
 664                         $extensions = array_unique( $wgFileExtensions );
 665                         if ( !$this->checkFileExtension( $this->mFinalExtension, $extensions ) ) {
 666                                 $warnings['filetype-unwanted-type'] = array( $this->mFinalExtension,
 667                                         $wgLang->commaList( $extensions ), count( $extensions ) );
 668                         }
 669                 }
 670
 671                 global $wgUploadSizeWarning;
 672                 if ( $wgUploadSizeWarning && ( $this->mFileSize > $wgUploadSizeWarning ) ) {
 673                         $warnings['large-file'] = array( $wgUploadSizeWarning, $this->mFileSize );
 674                 }
 675
 676                 if ( $this->mFileSize == 0 ) {
 677                         $warnings['emptyfile'] = true;
 678                 }
 679
 680                 $exists = self::getExistsWarning( $localFile );
 681                 if ( $exists !== false ) {
 682                         $warnings['exists'] = $exists;
 683                 }
 684
 685                 // Check dupes against existing files
 686                 $hash = $this->getTempFileSha1Base36();
 687                 $dupes = RepoGroup::singleton()->findBySha1( $hash );
 688                 $title = $this->getTitle();
 689                 // Remove all matches against self
 690                 foreach ( $dupes as $key => $dupe ) {
 691                         if ( $title->equals( $dupe->getTitle() ) ) {
 692                                 unset( $dupes[$key] );
 693                         }
 694                 }
 695                 if ( $dupes ) {
 696                         $warnings['duplicate'] = $dupes;
 697                 }
 698
 699                 // Check dupes against archives
 700                 $archivedImage = new ArchivedFile( null, 0, "{$hash}.{$this->mFinalExtension}" );
 701                 if ( $archivedImage->getID() > 0 ) {
 702                         if ( $archivedImage->userCan( File::DELETED_FILE ) ) {
 703                                 $warnings['duplicate-archive'] = $archivedImage->getName();
 704                         } else {
 705                                 $warnings['duplicate-archive'] = '';
 706                         }
 707                 }
 708
 709                 wfProfileOut( __METHOD__ );
 710
 711                 return $warnings;
 712         }
 713
 714         /**
 715          * Really perform the upload. Stores the file in the local repo, watches
 716          * if necessary and runs the UploadComplete hook.
 717          *
 718          * @param string $comment
 719          * @param string $pageText
 720          * @param bool $watch
 721          * @param User $user
 722          *
 723          * @return Status Indicating the whether the upload succeeded.
 724          */
 725         public function performUpload( $comment, $pageText, $watch, $user ) {
 726                 wfProfileIn( __METHOD__ );
 727
 728                 $status = $this->getLocalFile()->upload(
 729                         $this->mTempPath,
 730                         $comment,
 731                         $pageText,
 732                         File::DELETE_SOURCE,
 733                         $this->mFileProps,
 734                         false,
 735                         $user
 736                 );
 737
 738                 if ( $status->isGood() ) {
 739                         if ( $watch ) {
 740                                 WatchAction::doWatch(
 741                                         $this->getLocalFile()->getTitle(),
 742                                         $user,
 743                                         WatchedItem::IGNORE_USER_RIGHTS
 744                                 );
 745                         }
 746                         wfRunHooks( 'UploadComplete', array( &$this ) );
 747
 748                         $this->postProcessUpload();
 749                 }
 750
 751                 wfProfileOut( __METHOD__ );
 752
 753                 return $status;
 754         }
 755
 756         /**
 757          * Perform extra steps after a successful upload.
 758          *
 759          * @since  1.25
 760          */
 761         public function postProcessUpload() {
 762                 global $wgUploadThumbnailRenderMap;
 763
 764                 $jobs = array();
 765
 766                 $sizes = $wgUploadThumbnailRenderMap;
 767                 rsort( $sizes );
 768
 769                 $file = $this->getLocalFile();
 770
 771                 foreach ( $sizes as $size ) {
 772                         if ( $file->isVectorized()
 773                                 || $file->getWidth() > $size ) {
 774                                         $jobs[] = new ThumbnailRenderJob( $file->getTitle(), array(
 775                                                 'transformParams' => array( 'width' => $size ),
 776                                         ) );
 777                         }
 778                 }
 779
 780                 if ( $jobs ) {
 781                         JobQueueGroup::singleton()->push( $jobs );
 782                 }
 783         }
 784
 785         /**
 786          * Returns the title of the file to be uploaded. Sets mTitleError in case
 787          * the name was illegal.
 788          *
 789          * @return Title The title of the file or null in case the name was illegal
 790          */
 791         public function getTitle() {
 792                 if ( $this->mTitle !== false ) {
 793                         return $this->mTitle;
 794                 }
 795                 /* Assume that if a user specified File:Something.jpg, this is an error
 796                  * and that the namespace prefix needs to be stripped of.
 797                  */
 798                 $title = Title::newFromText( $this->mDesiredDestName );
 799                 if ( $title && $title->getNamespace() == NS_FILE ) {
 800                         $this->mFilteredName = $title->getDBkey();
 801                 } else {
 802                         $this->mFilteredName = $this->mDesiredDestName;
 803                 }
 804
 805                 # oi_archive_name is max 255 bytes, which include a timestamp and an
 806                 # exclamation mark, so restrict file name to 240 bytes.
 807                 if ( strlen( $this->mFilteredName ) > 240 ) {
 808                         $this->mTitleError = self::FILENAME_TOO_LONG;
 809                         $this->mTitle = null;
 810
 811                         return $this->mTitle;
 812                 }
 813
 814                 /**
 815                  * Chop off any directories in the given filename. Then
 816                  * filter out illegal characters, and try to make a legible name
 817                  * out of it. We'll strip some silently that Title would die on.
 818                  */
 819                 $this->mFilteredName = wfStripIllegalFilenameChars( $this->mFilteredName );
 820                 /* Normalize to title form before we do any further processing */
 821                 $nt = Title::makeTitleSafe( NS_FILE, $this->mFilteredName );
 822                 if ( is_null( $nt ) ) {
 823                         $this->mTitleError = self::ILLEGAL_FILENAME;
 824                         $this->mTitle = null;
 825
 826                         return $this->mTitle;
 827                 }
 828                 $this->mFilteredName = $nt->getDBkey();
 829
 830                 /**
 831                  * We'll want to blacklist against *any* 'extension', and use
 832                  * only the final one for the whitelist.
 833                  */
 834                 list( $partname, $ext ) = $this->splitExtensions( $this->mFilteredName );
 835
 836                 if ( count( $ext ) ) {
 837                         $this->mFinalExtension = trim( $ext[count( $ext ) - 1] );
 838                 } else {
 839                         $this->mFinalExtension = '';
 840
 841                         # No extension, try guessing one
 842                         $magic = MimeMagic::singleton();
 843                         $mime = $magic->guessMimeType( $this->mTempPath );
 844                         if ( $mime !== 'unknown/unknown' ) {
 845                                 # Get a space separated list of extensions
 846                                 $extList = $magic->getExtensionsForType( $mime );
 847                                 if ( $extList ) {
 848                                         # Set the extension to the canonical extension
 849                                         $this->mFinalExtension = strtok( $extList, ' ' );
 850
 851                                         # Fix up the other variables
 852                                         $this->mFilteredName .= ".{$this->mFinalExtension}";
 853                                         $nt = Title::makeTitleSafe( NS_FILE, $this->mFilteredName );
 854                                         $ext = array( $this->mFinalExtension );
 855                                 }
 856                         }
 857                 }
 858
 859                 /* Don't allow users to override the blacklist (check file extension) */
 860                 global $wgCheckFileExtensions, $wgStrictFileExtensions;
 861                 global $wgFileExtensions, $wgFileBlacklist;
 862
 863                 $blackListedExtensions = $this->checkFileExtensionList( $ext, $wgFileBlacklist );
 864
 865                 if ( $this->mFinalExtension == '' ) {
 866                         $this->mTitleError = self::FILETYPE_MISSING;
 867                         $this->mTitle = null;
 868
 869                         return $this->mTitle;
 870                 } elseif ( $blackListedExtensions ||
 871                         ( $wgCheckFileExtensions && $wgStrictFileExtensions &&
 872                                 !$this->checkFileExtension( $this->mFinalExtension, $wgFileExtensions ) )
 873                 ) {
 874                         $this->mBlackListedExtensions = $blackListedExtensions;
 875                         $this->mTitleError = self::FILETYPE_BADTYPE;
 876                         $this->mTitle = null;
 877
 878                         return $this->mTitle;
 879                 }
 880
 881                 // Windows may be broken with special characters, see bug 1780
 882                 if ( !preg_match( '/^[\x0-\x7f]*$/', $nt->getText() )
 883                         && !RepoGroup::singleton()->getLocalRepo()->backendSupportsUnicodePaths()
 884                 ) {
 885                         $this->mTitleError = self::WINDOWS_NONASCII_FILENAME;
 886                         $this->mTitle = null;
 887
 888                         return $this->mTitle;
 889                 }
 890
 891                 # If there was more than one "extension", reassemble the base
 892                 # filename to prevent bogus complaints about length
 893                 if ( count( $ext ) > 1 ) {
 894                         $iterations = count( $ext ) - 1;
 895                         for ( $i = 0; $i < $iterations; $i++ ) {
 896                                 $partname .= '.' . $ext[$i];
 897                         }
 898                 }
 899
 900                 if ( strlen( $partname ) < 1 ) {
 901                         $this->mTitleError = self::MIN_LENGTH_PARTNAME;
 902                         $this->mTitle = null;
 903
 904                         return $this->mTitle;
 905                 }
 906
 907                 $this->mTitle = $nt;
 908
 909                 return $this->mTitle;
 910         }
 911
 912         /**
 913          * Return the local file and initializes if necessary.
 914          *
 915          * @return LocalFile|UploadStashFile|null
 916          */
 917         public function getLocalFile() {
 918                 if ( is_null( $this->mLocalFile ) ) {
 919                         $nt = $this->getTitle();
 920                         $this->mLocalFile = is_null( $nt ) ? null : wfLocalFile( $nt );
 921                 }
 922
 923                 return $this->mLocalFile;
 924         }
 925
 926         /**
 927          * If the user does not supply all necessary information in the first upload
 928          * form submission (either by accident or by design) then we may want to
 929          * stash the file temporarily, get more information, and publish the file
 930          * later.
 931          *
 932          * This method will stash a file in a temporary directory for later
 933          * processing, and save the necessary descriptive info into the database.
 934          * This method returns the file object, which also has a 'fileKey' property
 935          * which can be passed through a form or API request to find this stashed
 936          * file again.
 937          *
 938          * @param User $user
 939          * @return UploadStashFile Stashed file
 940          */
 941         public function stashFile( User $user = null ) {
 942                 // was stashSessionFile
 943                 wfProfileIn( __METHOD__ );
 944
 945                 $stash = RepoGroup::singleton()->getLocalRepo()->getUploadStash( $user );
 946                 $file = $stash->stashFile( $this->mTempPath, $this->getSourceType() );
 947                 $this->mLocalFile = $file;
 948
 949                 wfProfileOut( __METHOD__ );
 950
 951                 return $file;
 952         }
 953
 954         /**
 955          * Stash a file in a temporary directory, returning a key which can be used
 956          * to find the file again. See stashFile().
 957          *
 958          * @return string File key
 959          */
 960         public function stashFileGetKey() {
 961                 return $this->stashFile()->getFileKey();
 962         }
 963
 964         /**
 965          * alias for stashFileGetKey, for backwards compatibility
 966          *
 967          * @return string File key
 968          */
 969         public function stashSession() {
 970                 return $this->stashFileGetKey();
 971         }
 972
 973         /**
 974          * If we've modified the upload file we need to manually remove it
 975          * on exit to clean up.
 976          */
 977         public function cleanupTempFile() {
 978                 if ( $this->mRemoveTempFile && $this->mTempPath && file_exists( $this->mTempPath ) ) {
 979                         wfDebug( __METHOD__ . ": Removing temporary file {$this->mTempPath}\n" );
 980                         unlink( $this->mTempPath );
 981                 }
 982         }
 983
 984         public function getTempPath() {
 985                 return $this->mTempPath;
 986         }
 987
 988         /**
 989          * Split a file into a base name and all dot-delimited 'extensions'
 990          * on the end. Some web server configurations will fall back to
 991          * earlier pseudo-'extensions' to determine type and execute
 992          * scripts, so the blacklist needs to check them all.
 993          *
 994          * @param string $filename
 995          * @return array
 996          */
 997         public static function splitExtensions( $filename ) {
 998                 $bits = explode( '.', $filename );
 999                 $basename = array_shift( $bits );
1000
1001                 return array( $basename, $bits );
1002         }
1003
1004         /**
1005          * Perform case-insensitive match against a list of file extensions.
1006          * Returns true if the extension is in the list.
1007          *
1008          * @param string $ext
1009          * @param array $list
1010          * @return bool
1011          */
1012         public static function checkFileExtension( $ext, $list ) {
1013                 return in_array( strtolower( $ext ), $list );
1014         }
1015
1016         /**
1017          * Perform case-insensitive match against a list of file extensions.
1018          * Returns an array of matching extensions.
1019          *
1020          * @param array $ext
1021          * @param array $list
1022          * @return bool
1023          */
1024         public static function checkFileExtensionList( $ext, $list ) {
1025                 return array_intersect( array_map( 'strtolower', $ext ), $list );
1026         }
1027
1028         /**
1029          * Checks if the MIME type of the uploaded file matches the file extension.
1030          *
1031          * @param string $mime The MIME type of the uploaded file
1032          * @param string $extension The filename extension that the file is to be served with
1033          * @return bool
1034          */
1035         public static function verifyExtension( $mime, $extension ) {
1036                 $magic = MimeMagic::singleton();
1037
1038                 if ( !$mime || $mime == 'unknown' || $mime == 'unknown/unknown' ) {
1039                         if ( !$magic->isRecognizableExtension( $extension ) ) {
1040                                 wfDebug( __METHOD__ . ": passing file with unknown detected mime type; " .
1041                                         "unrecognized extension '$extension', can't verify\n" );
1042
1043                                 return true;
1044                         } else {
1045                                 wfDebug( __METHOD__ . ": rejecting file with unknown detected mime type; " .
1046                                         "recognized extension '$extension', so probably invalid file\n" );
1047
1048                                 return false;
1049                         }
1050                 }
1051
1052                 $match = $magic->isMatchingExtension( $extension, $mime );
1053
1054                 if ( $match === null ) {
1055                         if ( $magic->getTypesForExtension( $extension ) !== null ) {
1056                                 wfDebug( __METHOD__ . ": No extension known for $mime, but we know a mime for $extension\n" );
1057
1058                                 return false;
1059                         } else {
1060                                 wfDebug( __METHOD__ . ": no file extension known for mime type $mime, passing file\n" );
1061
1062                                 return true;
1063                         }
1064                 } elseif ( $match === true ) {
1065                         wfDebug( __METHOD__ . ": mime type $mime matches extension $extension, passing file\n" );
1066
1067                         /** @todo If it's a bitmap, make sure PHP or ImageMagick resp. can handle it! */
1068                         return true;
1069                 } else {
1070                         wfDebug( __METHOD__
1071                                 . ": mime type $mime mismatches file extension $extension, rejecting file\n" );
1072
1073                         return false;
1074                 }
1075         }
1076
1077         /**
1078          * Heuristic for detecting files that *could* contain JavaScript instructions or
1079          * things that may look like HTML to a browser and are thus
1080          * potentially harmful. The present implementation will produce false
1081          * positives in some situations.
1082          *
1083          * @param string $file Pathname to the temporary upload file
1084          * @param string $mime The MIME type of the file
1085          * @param string $extension The extension of the file
1086          * @return bool True if the file contains something looking like embedded scripts
1087          */
1088         public static function detectScript( $file, $mime, $extension ) {
1089                 global $wgAllowTitlesInSVG;
1090                 wfProfileIn( __METHOD__ );
1091
1092                 # ugly hack: for text files, always look at the entire file.
1093                 # For binary field, just check the first K.
1094
1095                 if ( strpos( $mime, 'text/' ) === 0 ) {
1096                         $chunk = file_get_contents( $file );
1097                 } else {
1098                         $fp = fopen( $file, 'rb' );
1099                         $chunk = fread( $fp, 1024 );
1100                         fclose( $fp );
1101                 }
1102
1103                 $chunk = strtolower( $chunk );
1104
1105                 if ( !$chunk ) {
1106                         wfProfileOut( __METHOD__ );
1107
1108                         return false;
1109                 }
1110
1111                 # decode from UTF-16 if needed (could be used for obfuscation).
1112                 if ( substr( $chunk, 0, 2 ) == "\xfe\xff" ) {
1113                         $enc = 'UTF-16BE';
1114                 } elseif ( substr( $chunk, 0, 2 ) == "\xff\xfe" ) {
1115                         $enc = 'UTF-16LE';
1116                 } else {
1117                         $enc = null;
1118                 }
1119
1120                 if ( $enc ) {
1121                         $chunk = iconv( $enc, "ASCII//IGNORE", $chunk );
1122                 }
1123
1124                 $chunk = trim( $chunk );
1125
1126                 /** @todo FIXME: Convert from UTF-16 if necessary! */
1127                 wfDebug( __METHOD__ . ": checking for embedded scripts and HTML stuff\n" );
1128
1129                 # check for HTML doctype
1130                 if ( preg_match( "/<!DOCTYPE *X?HTML/i", $chunk ) ) {
1131                         wfProfileOut( __METHOD__ );
1132
1133                         return true;
1134                 }
1135
1136                 // Some browsers will interpret obscure xml encodings as UTF-8, while
1137                 // PHP/expat will interpret the given encoding in the xml declaration (bug 47304)
1138                 if ( $extension == 'svg' || strpos( $mime, 'image/svg' ) === 0 ) {
1139                         if ( self::checkXMLEncodingMissmatch( $file ) ) {
1140                                 wfProfileOut( __METHOD__ );
1141
1142                                 return true;
1143                         }
1144                 }
1145
1146                 /**
1147                  * Internet Explorer for Windows performs some really stupid file type
1148                  * autodetection which can cause it to interpret valid image files as HTML
1149                  * and potentially execute JavaScript, creating a cross-site scripting
1150                  * attack vectors.
1151                  *
1152                  * Apple's Safari browser also performs some unsafe file type autodetection
1153                  * which can cause legitimate files to be interpreted as HTML if the
1154                  * web server is not correctly configured to send the right content-type
1155                  * (or if you're really uploading plain text and octet streams!)
1156                  *
1157                  * Returns true if IE is likely to mistake the given file for HTML.
1158                  * Also returns true if Safari would mistake the given file for HTML
1159                  * when served with a generic content-type.
1160                  */
1161                 $tags = array(
1162                         '<a href',
1163                         '<body',
1164                         '<head',
1165                         '<html', #also in safari
1166                         '<img',
1167                         '<pre',
1168                         '<script', #also in safari
1169                         '<table'
1170                 );
1171
1172                 if ( !$wgAllowTitlesInSVG && $extension !== 'svg' && $mime !== 'image/svg' ) {
1173                         $tags[] = '<title';
1174                 }
1175
1176                 foreach ( $tags as $tag ) {
1177                         if ( false !== strpos( $chunk, $tag ) ) {
1178                                 wfDebug( __METHOD__ . ": found something that may make it be mistaken for html: $tag\n" );
1179                                 wfProfileOut( __METHOD__ );
1180
1181                                 return true;
1182                         }
1183                 }
1184
1185                 /*
1186                  * look for JavaScript
1187                  */
1188
1189                 # resolve entity-refs to look at attributes. may be harsh on big files... cache result?
1190                 $chunk = Sanitizer::decodeCharReferences( $chunk );
1191
1192                 # look for script-types
1193                 if ( preg_match( '!type\s*=\s*[\'"]?\s*(?:\w*/)?(?:ecma|java)!sim', $chunk ) ) {
1194                         wfDebug( __METHOD__ . ": found script types\n" );
1195                         wfProfileOut( __METHOD__ );
1196
1197                         return true;
1198                 }
1199
1200                 # look for html-style script-urls
1201                 if ( preg_match( '!(?:href|src|data)\s*=\s*[\'"]?\s*(?:ecma|java)script:!sim', $chunk ) ) {
1202                         wfDebug( __METHOD__ . ": found html-style script urls\n" );
1203                         wfProfileOut( __METHOD__ );
1204
1205                         return true;
1206                 }
1207
1208                 # look for css-style script-urls
1209                 if ( preg_match( '!url\s*\(\s*[\'"]?\s*(?:ecma|java)script:!sim', $chunk ) ) {
1210                         wfDebug( __METHOD__ . ": found css-style script urls\n" );
1211                         wfProfileOut( __METHOD__ );
1212
1213                         return true;
1214                 }
1215
1216                 wfDebug( __METHOD__ . ": no scripts found\n" );
1217                 wfProfileOut( __METHOD__ );
1218
1219                 return false;
1220         }
1221
1222         /**
1223          * Check a whitelist of xml encodings that are known not to be interpreted differently
1224          * by the server's xml parser (expat) and some common browsers.
1225          *
1226          * @param string $file Pathname to the temporary upload file
1227          * @return bool True if the file contains an encoding that could be misinterpreted
1228          */
1229         public static function checkXMLEncodingMissmatch( $file ) {
1230                 global $wgSVGMetadataCutoff;
1231                 $contents = file_get_contents( $file, false, null, -1, $wgSVGMetadataCutoff );
1232                 $encodingRegex = '!encoding[ \t\n\r]*=[ \t\n\r]*[\'"](.*?)[\'"]!si';
1233
1234                 if ( preg_match( "!<\?xml\b(.*?)\?>!si", $contents, $matches ) ) {
1235                         if ( preg_match( $encodingRegex, $matches[1], $encMatch )
1236                                 && !in_array( strtoupper( $encMatch[1] ), self::$safeXmlEncodings )
1237                         ) {
1238                                 wfDebug( __METHOD__ . ": Found unsafe XML encoding '{$encMatch[1]}'\n" );
1239
1240                                 return true;
1241                         }
1242                 } elseif ( preg_match( "!<\?xml\b!si", $contents ) ) {
1243                         // Start of XML declaration without an end in the first $wgSVGMetadataCutoff
1244                         // bytes. There shouldn't be a legitimate reason for this to happen.
1245                         wfDebug( __METHOD__ . ": Unmatched XML declaration start\n" );
1246
1247                         return true;
1248                 } elseif ( substr( $contents, 0, 4 ) == "\x4C\x6F\xA7\x94" ) {
1249                         // EBCDIC encoded XML
1250                         wfDebug( __METHOD__ . ": EBCDIC Encoded XML\n" );
1251
1252                         return true;
1253                 }
1254
1255                 // It's possible the file is encoded with multi-byte encoding, so re-encode attempt to
1256                 // detect the encoding in case is specifies an encoding not whitelisted in self::$safeXmlEncodings
1257                 $attemptEncodings = array( 'UTF-16', 'UTF-16BE', 'UTF-32', 'UTF-32BE' );
1258                 foreach ( $attemptEncodings as $encoding ) {
1259                         wfSuppressWarnings();
1260                         $str = iconv( $encoding, 'UTF-8', $contents );
1261                         wfRestoreWarnings();
1262                         if ( $str != '' && preg_match( "!<\?xml\b(.*?)\?>!si", $str, $matches ) ) {
1263                                 if ( preg_match( $encodingRegex, $matches[1], $encMatch )
1264                                         && !in_array( strtoupper( $encMatch[1] ), self::$safeXmlEncodings )
1265                                 ) {
1266                                         wfDebug( __METHOD__ . ": Found unsafe XML encoding '{$encMatch[1]}'\n" );
1267
1268                                         return true;
1269                                 }
1270                         } elseif ( $str != '' && preg_match( "!<\?xml\b!si", $str ) ) {
1271                                 // Start of XML declaration without an end in the first $wgSVGMetadataCutoff
1272                                 // bytes. There shouldn't be a legitimate reason for this to happen.
1273                                 wfDebug( __METHOD__ . ": Unmatched XML declaration start\n" );
1274
1275                                 return true;
1276                         }
1277                 }
1278
1279                 return false;
1280         }
1281
1282         /**
1283          * @param string $filename
1284          * @return mixed False of the file is verified (does not contain scripts), array otherwise.
1285          */
1286         protected function detectScriptInSvg( $filename ) {
1287                 $this->mSVGNSError = false;
1288                 $check = new XmlTypeCheck(
1289                         $filename,
1290                         array( $this, 'checkSvgScriptCallback' ),
1291                         true,
1292                         array( 'processing_instruction_handler' => 'UploadBase::checkSvgPICallback' )
1293                 );
1294                 if ( $check->wellFormed !== true ) {
1295                         // Invalid xml (bug 58553)
1296                         return array( 'uploadinvalidxml' );
1297                 } elseif ( $check->filterMatch ) {
1298                         if ( $this->mSVGNSError ) {
1299                                 return array( 'uploadscriptednamespace', $this->mSVGNSError );
1300                         }
1301
1302                         return array( 'uploadscripted' );
1303                 }
1304
1305                 return false;
1306         }
1307
1308         /**
1309          * Callback to filter SVG Processing Instructions.
1310          * @param string $target Processing instruction name
1311          * @param string $data Processing instruction attribute and value
1312          * @return bool (true if the filter identified something bad)
1313          */
1314         public static function checkSvgPICallback( $target, $data ) {
1315                 // Don't allow external stylesheets (bug 57550)
1316                 if ( preg_match( '/xml-stylesheet/i', $target ) ) {
1317                         return true;
1318                 }
1319
1320                 return false;
1321         }
1322
1323         /**
1324          * @todo Replace this with a whitelist filter!
1325          * @param string $element
1326          * @param array $attribs
1327          * @return bool
1328          */
1329         public function checkSvgScriptCallback( $element, $attribs, $data = null ) {
1330
1331                 list( $namespace, $strippedElement ) = $this->splitXmlNamespace( $element );
1332
1333                 // We specifically don't include:
1334                 // http://www.w3.org/1999/xhtml (bug 60771)
1335                 static $validNamespaces = array(
1336                         '',
1337                         'adobe:ns:meta/',
1338                         'http://creativecommons.org/ns#',
1339                         'http://inkscape.sourceforge.net/dtd/sodipodi-0.dtd',
1340                         'http://ns.adobe.com/adobeillustrator/10.0/',
1341                         'http://ns.adobe.com/adobesvgviewerextensions/3.0/',
1342                         'http://ns.adobe.com/extensibility/1.0/',
1343                         'http://ns.adobe.com/flows/1.0/',
1344                         'http://ns.adobe.com/illustrator/1.0/',
1345                         'http://ns.adobe.com/imagereplacement/1.0/',
1346                         'http://ns.adobe.com/pdf/1.3/',
1347                         'http://ns.adobe.com/photoshop/1.0/',
1348                         'http://ns.adobe.com/saveforweb/1.0/',
1349                         'http://ns.adobe.com/variables/1.0/',
1350                         'http://ns.adobe.com/xap/1.0/',
1351                         'http://ns.adobe.com/xap/1.0/g/',
1352                         'http://ns.adobe.com/xap/1.0/g/img/',
1353                         'http://ns.adobe.com/xap/1.0/mm/',
1354                         'http://ns.adobe.com/xap/1.0/rights/',
1355                         'http://ns.adobe.com/xap/1.0/stype/dimensions#',
1356                         'http://ns.adobe.com/xap/1.0/stype/font#',
1357                         'http://ns.adobe.com/xap/1.0/stype/manifestitem#',
1358                         'http://ns.adobe.com/xap/1.0/stype/resourceevent#',
1359                         'http://ns.adobe.com/xap/1.0/stype/resourceref#',
1360                         'http://ns.adobe.com/xap/1.0/t/pg/',
1361                         'http://purl.org/dc/elements/1.1/',
1362                         'http://purl.org/dc/elements/1.1',
1363                         'http://schemas.microsoft.com/visio/2003/svgextensions/',
1364                         'http://sodipodi.sourceforge.net/dtd/sodipodi-0.dtd',
1365                         'http://taptrix.com/inkpad/svg_extensions',
1366                         'http://web.resource.org/cc/',
1367                         'http://www.freesoftware.fsf.org/bkchem/cdml',
1368                         'http://www.inkscape.org/namespaces/inkscape',
1369                         'http://www.opengis.net/gml',
1370                         'http://www.w3.org/1999/02/22-rdf-syntax-ns#',
1371                         'http://www.w3.org/2000/svg',
1372                         'http://www.w3.org/tr/rec-rdf-syntax/',
1373                 );
1374
1375                 if ( !in_array( $namespace, $validNamespaces ) ) {
1376                         wfDebug( __METHOD__ . ": Non-svg namespace '$namespace' in uploaded file.\n" );
1377                         /** @todo Return a status object to a closure in XmlTypeCheck, for MW1.21+ */
1378                         $this->mSVGNSError = $namespace;
1379
1380                         return true;
1381                 }
1382
1383                 /*
1384                  * check for elements that can contain javascript
1385                  */
1386                 if ( $strippedElement == 'script' ) {
1387                         wfDebug( __METHOD__ . ": Found script element '$element' in uploaded file.\n" );
1388
1389                         return true;
1390                 }
1391
1392                 # e.g., <svg xmlns="http://www.w3.org/2000/svg">
1393                 #  <handler xmlns:ev="http://www.w3.org/2001/xml-events" ev:event="load">alert(1)</handler> </svg>
1394                 if ( $strippedElement == 'handler' ) {
1395                         wfDebug( __METHOD__ . ": Found scriptable element '$element' in uploaded file.\n" );
1396
1397                         return true;
1398                 }
1399
1400                 # SVG reported in Feb '12 that used xml:stylesheet to generate javascript block
1401                 if ( $strippedElement == 'stylesheet' ) {
1402                         wfDebug( __METHOD__ . ": Found scriptable element '$element' in uploaded file.\n" );
1403
1404                         return true;
1405                 }
1406
1407                 # Block iframes, in case they pass the namespace check
1408                 if ( $strippedElement == 'iframe' ) {
1409                         wfDebug( __METHOD__ . ": iframe in uploaded file.\n" );
1410
1411                         return true;
1412                 }
1413
1414                 # Check <style> css
1415                 if ( $strippedElement == 'style'
1416                         && self::checkCssFragment( Sanitizer::normalizeCss( $data ) )
1417                 ) {
1418                         wfDebug( __METHOD__ . ": hostile css in style element.\n" );
1419                         return true;
1420                 }
1421
1422                 foreach ( $attribs as $attrib => $value ) {
1423                         $stripped = $this->stripXmlNamespace( $attrib );
1424                         $value = strtolower( $value );
1425
1426                         if ( substr( $stripped, 0, 2 ) == 'on' ) {
1427                                 wfDebug( __METHOD__
1428                                         . ": Found event-handler attribute '$attrib'='$value' in uploaded file.\n" );
1429
1430                                 return true;
1431                         }
1432
1433                         # href with non-local target (don't allow http://, javascript:, etc)
1434                         if ( $stripped == 'href'
1435                                 && strpos( $value, 'data:' ) !== 0
1436                                 && strpos( $value, '#' ) !== 0
1437                         ) {
1438                                 if ( !( $strippedElement === 'a'
1439                                         && preg_match( '!^https?://!im', $value ) )
1440                                 ) {
1441                                         wfDebug( __METHOD__ . ": Found href attribute <$strippedElement "
1442                                                 . "'$attrib'='$value' in uploaded file.\n" );
1443
1444                                         return true;
1445                                 }
1446                         }
1447
1448                         # href with embedded svg as target
1449                         if ( $stripped == 'href' && preg_match( '!data:[^,]*image/svg[^,]*,!sim', $value ) ) {
1450                                 wfDebug( __METHOD__ . ": Found href to embedded svg "
1451                                         . "\"<$strippedElement '$attrib'='$value'...\" in uploaded file.\n" );
1452
1453                                 return true;
1454                         }
1455
1456                         # href with embedded (text/xml) svg as target
1457                         if ( $stripped == 'href' && preg_match( '!data:[^,]*text/xml[^,]*,!sim', $value ) ) {
1458                                 wfDebug( __METHOD__ . ": Found href to embedded svg "
1459                                         . "\"<$strippedElement '$attrib'='$value'...\" in uploaded file.\n" );
1460
1461                                 return true;
1462                         }
1463
1464                         # Change href with animate from (http://html5sec.org/#137). This doesn't seem
1465                         # possible without embedding the svg, but filter here in case.
1466                         if ( $stripped == 'from'
1467                                 && $strippedElement === 'animate'
1468                                 && !preg_match( '!^https?://!im', $value )
1469                         ) {
1470                                 wfDebug( __METHOD__ . ": Found animate that might be changing href using from "
1471                                         . "\"<$strippedElement '$attrib'='$value'...\" in uploaded file.\n" );
1472
1473                                 return true;
1474                         }
1475
1476                         # use set/animate to add event-handler attribute to parent
1477                         if ( ( $strippedElement == 'set' || $strippedElement == 'animate' )
1478                                 && $stripped == 'attributename'
1479                                 && substr( $value, 0, 2 ) == 'on'
1480                         ) {
1481                                 wfDebug( __METHOD__ . ": Found svg setting event-handler attribute with "
1482                                         . "\"<$strippedElement $stripped='$value'...\" in uploaded file.\n" );
1483
1484                                 return true;
1485                         }
1486
1487                         # use set to add href attribute to parent element
1488                         if ( $strippedElement == 'set'
1489                                 && $stripped == 'attributename'
1490                                 && strpos( $value, 'href' ) !== false
1491                         ) {
1492                                 wfDebug( __METHOD__ . ": Found svg setting href attribute '$value' in uploaded file.\n" );
1493
1494                                 return true;
1495                         }
1496
1497                         # use set to add a remote / data / script target to an element
1498                         if ( $strippedElement == 'set'
1499                                 && $stripped == 'to'
1500                                 && preg_match( '!(http|https|data|script):!sim', $value )
1501                         ) {
1502                                 wfDebug( __METHOD__ . ": Found svg setting attribute to '$value' in uploaded file.\n" );
1503
1504                                 return true;
1505                         }
1506
1507                         # use handler attribute with remote / data / script
1508                         if ( $stripped == 'handler' && preg_match( '!(http|https|data|script):!sim', $value ) ) {
1509                                 wfDebug( __METHOD__ . ": Found svg setting handler with remote/data/script "
1510                                         . "'$attrib'='$value' in uploaded file.\n" );
1511
1512                                 return true;
1513                         }
1514
1515                         # use CSS styles to bring in remote code
1516                         if ( $stripped == 'style'
1517                                 && self::checkCssFragment( Sanitizer::normalizeCss( $value ) )
1518                         ) {
1519                                 wfDebug( __METHOD__ . ": Found svg setting a style with "
1520                                         . "remote url '$attrib'='$value' in uploaded file.\n" );
1521                                 return true;
1522                         }
1523
1524                         # Several attributes can include css, css character escaping isn't allowed
1525                         $cssAttrs = array( 'font', 'clip-path', 'fill', 'filter', 'marker',
1526                                 'marker-end', 'marker-mid', 'marker-start', 'mask', 'stroke' );
1527                         if ( in_array( $stripped, $cssAttrs )
1528                                 && self::checkCssFragment( $value )
1529                         ) {
1530                                 wfDebug( __METHOD__ . ": Found svg setting a style with "
1531                                         . "remote url '$attrib'='$value' in uploaded file.\n" );
1532                                 return true;
1533                         }
1534
1535                         # image filters can pull in url, which could be svg that executes scripts
1536                         if ( $strippedElement == 'image'
1537                                 && $stripped == 'filter'
1538                                 && preg_match( '!url\s*\(!sim', $value )
1539                         ) {
1540                                 wfDebug( __METHOD__ . ": Found image filter with url: "
1541                                         . "\"<$strippedElement $stripped='$value'...\" in uploaded file.\n" );
1542
1543                                 return true;
1544                         }
1545                 }
1546
1547                 return false; //No scripts detected
1548         }
1549
1550         /**
1551          * Check a block of CSS or CSS fragment for anything that looks like
1552          * it is bringing in remote code.
1553          * @param string $value a string of CSS
1554          * @param bool $propOnly only check css properties (start regex with :)
1555          * @return bool true if the CSS contains an illegal string, false if otherwise
1556          */
1557         private static function checkCssFragment( $value ) {
1558
1559                 # Forbid external stylesheets, for both reliability and to protect viewer's privacy
1560                 if ( strpos( $value, '@import' ) !== false ) {
1561                         return true;
1562                 }
1563
1564                 # We allow @font-face to embed fonts with data: urls, so we snip the string
1565                 # 'url' out so this case won't match when we check for urls below
1566                 $pattern = '!(@font-face\s*{[^}]*src:)url(\("data:;base64,)!im';
1567                 $value = preg_replace( $pattern, '$1$2', $value );
1568
1569                 # Check for remote and executable CSS. Unlike in Sanitizer::checkCss, the CSS
1570                 # properties filter and accelerator don't seem to be useful for xss in SVG files.
1571                 # Expression and -o-link don't seem to work either, but filtering them here in case.
1572                 # Additionally, we catch remote urls like url("http:..., url('http:..., url(http:...,
1573                 # but not local ones such as url("#..., url('#..., url(#....
1574                 if ( preg_match( '!expression
1575                                 | -o-link\s*:
1576                                 | -o-link-source\s*:
1577                                 | -o-replace\s*:!imx', $value ) ) {
1578                         return true;
1579                 }
1580
1581                 if ( preg_match_all(
1582                                 "!(\s*(url|image|image-set)\s*\(\s*[\"']?\s*[^#]+.*?\))!sim",
1583                                 $value,
1584                                 $matches
1585                         ) !== 0
1586                 ) {
1587                         # TODO: redo this in one regex. Until then, url("#whatever") matches the first
1588                         foreach ( $matches[1] as $match ) {
1589                                 if ( !preg_match( "!\s*(url|image|image-set)\s*\(\s*(#|'#|\"#)!im", $match ) ) {
1590                                         return true;
1591                                 }
1592                         }
1593                 }
1594
1595                 if ( preg_match( '/[\000-\010\013\016-\037\177]/', $value ) ) {
1596                         return true;
1597                 }
1598
1599                 return false;
1600         }
1601
1602         /**
1603          * Divide the element name passed by the xml parser to the callback into URI and prifix.
1604          * @param string $element
1605          * @return array Containing the namespace URI and prefix
1606          */
1607         private static function splitXmlNamespace( $element ) {
1608                 // 'http://www.w3.org/2000/svg:script' -> array( 'http://www.w3.org/2000/svg', 'script' )
1609                 $parts = explode( ':', strtolower( $element ) );
1610                 $name = array_pop( $parts );
1611                 $ns = implode( ':', $parts );
1612
1613                 return array( $ns, $name );
1614         }
1615
1616         /**
1617          * @param string $name
1618          * @return string
1619          */
1620         private function stripXmlNamespace( $name ) {
1621                 // 'http://www.w3.org/2000/svg:script' -> 'script'
1622                 $parts = explode( ':', strtolower( $name ) );
1623
1624                 return array_pop( $parts );
1625         }
1626
1627         /**
1628          * Generic wrapper function for a virus scanner program.
1629          * This relies on the $wgAntivirus and $wgAntivirusSetup variables.
1630          * $wgAntivirusRequired may be used to deny upload if the scan fails.
1631          *
1632          * @param string $file Pathname to the temporary upload file
1633          * @return mixed False if not virus is found, null if the scan fails or is disabled,
1634          *   or a string containing feedback from the virus scanner if a virus was found.
1635          *   If textual feedback is missing but a virus was found, this function returns true.
1636          */
1637         public static function detectVirus( $file ) {
1638                 global $wgAntivirus, $wgAntivirusSetup, $wgAntivirusRequired, $wgOut;
1639                 wfProfileIn( __METHOD__ );
1640
1641                 if ( !$wgAntivirus ) {
1642                         wfDebug( __METHOD__ . ": virus scanner disabled\n" );
1643                         wfProfileOut( __METHOD__ );
1644
1645                         return null;
1646                 }
1647
1648                 if ( !$wgAntivirusSetup[$wgAntivirus] ) {
1649                         wfDebug( __METHOD__ . ": unknown virus scanner: $wgAntivirus\n" );
1650                         $wgOut->wrapWikiMsg( "<div class=\"error\">\n$1\n</div>",
1651                                 array( 'virus-badscanner', $wgAntivirus ) );
1652                         wfProfileOut( __METHOD__ );
1653
1654                         return wfMessage( 'virus-unknownscanner' )->text() . " $wgAntivirus";
1655                 }
1656
1657                 # look up scanner configuration
1658                 $command = $wgAntivirusSetup[$wgAntivirus]['command'];
1659                 $exitCodeMap = $wgAntivirusSetup[$wgAntivirus]['codemap'];
1660                 $msgPattern = isset( $wgAntivirusSetup[$wgAntivirus]['messagepattern'] ) ?
1661                         $wgAntivirusSetup[$wgAntivirus]['messagepattern'] : null;
1662
1663                 if ( strpos( $command, "%f" ) === false ) {
1664                         # simple pattern: append file to scan
1665                         $command .= " " . wfEscapeShellArg( $file );
1666                 } else {
1667                         # complex pattern: replace "%f" with file to scan
1668                         $command = str_replace( "%f", wfEscapeShellArg( $file ), $command );
1669                 }
1670
1671                 wfDebug( __METHOD__ . ": running virus scan: $command \n" );
1672
1673                 # execute virus scanner
1674                 $exitCode = false;
1675
1676                 # NOTE: there's a 50 line workaround to make stderr redirection work on windows, too.
1677                 #      that does not seem to be worth the pain.
1678                 #      Ask me (Duesentrieb) about it if it's ever needed.
1679                 $output = wfShellExecWithStderr( $command, $exitCode );
1680
1681                 # map exit code to AV_xxx constants.
1682                 $mappedCode = $exitCode;
1683                 if ( $exitCodeMap ) {
1684                         if ( isset( $exitCodeMap[$exitCode] ) ) {
1685                                 $mappedCode = $exitCodeMap[$exitCode];
1686                         } elseif ( isset( $exitCodeMap["*"] ) ) {
1687                                 $mappedCode = $exitCodeMap["*"];
1688                         }
1689                 }
1690
1691                 /* NB: AV_NO_VIRUS is 0 but AV_SCAN_FAILED is false,
1692                  * so we need the strict equalities === and thus can't use a switch here
1693                  */
1694                 if ( $mappedCode === AV_SCAN_FAILED ) {
1695                         # scan failed (code was mapped to false by $exitCodeMap)
1696                         wfDebug( __METHOD__ . ": failed to scan $file (code $exitCode).\n" );
1697
1698                         $output = $wgAntivirusRequired
1699                                 ? wfMessage( 'virus-scanfailed', array( $exitCode ) )->text()
1700                                 : null;
1701                 } elseif ( $mappedCode === AV_SCAN_ABORTED ) {
1702                         # scan failed because filetype is unknown (probably imune)
1703                         wfDebug( __METHOD__ . ": unsupported file type $file (code $exitCode).\n" );
1704                         $output = null;
1705                 } elseif ( $mappedCode === AV_NO_VIRUS ) {
1706                         # no virus found
1707                         wfDebug( __METHOD__ . ": file passed virus scan.\n" );
1708                         $output = false;
1709                 } else {
1710                         $output = trim( $output );
1711
1712                         if ( !$output ) {
1713                                 $output = true; #if there's no output, return true
1714                         } elseif ( $msgPattern ) {
1715                                 $groups = array();
1716                                 if ( preg_match( $msgPattern, $output, $groups ) ) {
1717                                         if ( $groups[1] ) {
1718                                                 $output = $groups[1];
1719                                         }
1720                                 }
1721                         }
1722
1723                         wfDebug( __METHOD__ . ": FOUND VIRUS! scanner feedback: $output \n" );
1724                 }
1725
1726                 wfProfileOut( __METHOD__ );
1727
1728                 return $output;
1729         }
1730
1731         /**
1732          * Check if there's an overwrite conflict and, if so, if restrictions
1733          * forbid this user from performing the upload.
1734          *
1735          * @param User $user
1736          *
1737          * @return mixed True on success, array on failure
1738          */
1739         private function checkOverwrite( $user ) {
1740                 // First check whether the local file can be overwritten
1741                 $file = $this->getLocalFile();
1742                 if ( $file->exists() ) {
1743                         if ( !self::userCanReUpload( $user, $file ) ) {
1744                                 return array( 'fileexists-forbidden', $file->getName() );
1745                         } else {
1746                                 return true;
1747                         }
1748                 }
1749
1750                 /* Check shared conflicts: if the local file does not exist, but
1751                  * wfFindFile finds a file, it exists in a shared repository.
1752                  */
1753                 $file = wfFindFile( $this->getTitle() );
1754                 if ( $file && !$user->isAllowed( 'reupload-shared' ) ) {
1755                         return array( 'fileexists-shared-forbidden', $file->getName() );
1756                 }
1757
1758                 return true;
1759         }
1760
1761         /**
1762          * Check if a user is the last uploader
1763          *
1764          * @param User $user
1765          * @param string $img Image name
1766          * @return bool
1767          */
1768         public static function userCanReUpload( User $user, $img ) {
1769                 if ( $user->isAllowed( 'reupload' ) ) {
1770                         return true; // non-conditional
1771                 }
1772                 if ( !$user->isAllowed( 'reupload-own' ) ) {
1773                         return false;
1774                 }
1775                 if ( is_string( $img ) ) {
1776                         $img = wfLocalFile( $img );
1777                 }
1778                 if ( !( $img instanceof LocalFile ) ) {
1779                         return false;
1780                 }
1781
1782                 return $user->getId() == $img->getUser( 'id' );
1783         }
1784
1785         /**
1786          * Helper function that does various existence checks for a file.
1787          * The following checks are performed:
1788          * - The file exists
1789          * - Article with the same name as the file exists
1790          * - File exists with normalized extension
1791          * - The file looks like a thumbnail and the original exists
1792          *
1793          * @param File $file The File object to check
1794          * @return mixed False if the file does not exists, else an array
1795          */
1796         public static function getExistsWarning( $file ) {
1797                 if ( $file->exists() ) {
1798                         return array( 'warning' => 'exists', 'file' => $file );
1799                 }
1800
1801                 if ( $file->getTitle()->getArticleID() ) {
1802                         return array( 'warning' => 'page-exists', 'file' => $file );
1803                 }
1804
1805                 if ( $file->wasDeleted() && !$file->exists() ) {
1806                         return array( 'warning' => 'was-deleted', 'file' => $file );
1807                 }
1808
1809                 if ( strpos( $file->getName(), '.' ) == false ) {
1810                         $partname = $file->getName();
1811                         $extension = '';
1812                 } else {
1813                         $n = strrpos( $file->getName(), '.' );
1814                         $extension = substr( $file->getName(), $n + 1 );
1815                         $partname = substr( $file->getName(), 0, $n );
1816                 }
1817                 $normalizedExtension = File::normalizeExtension( $extension );
1818
1819                 if ( $normalizedExtension != $extension ) {
1820                         // We're not using the normalized form of the extension.
1821                         // Normal form is lowercase, using most common of alternate
1822                         // extensions (eg 'jpg' rather than 'JPEG').
1823                         //
1824                         // Check for another file using the normalized form...
1825                         $nt_lc = Title::makeTitle( NS_FILE, "{$partname}.{$normalizedExtension}" );
1826                         $file_lc = wfLocalFile( $nt_lc );
1827
1828                         if ( $file_lc->exists() ) {
1829                                 return array(
1830                                         'warning' => 'exists-normalized',
1831                                         'file' => $file,
1832                                         'normalizedFile' => $file_lc
1833                                 );
1834                         }
1835                 }
1836
1837                 // Check for files with the same name but a different extension
1838                 $similarFiles = RepoGroup::singleton()->getLocalRepo()->findFilesByPrefix(
1839                         "{$partname}.", 1 );
1840                 if ( count( $similarFiles ) ) {
1841                         return array(
1842                                 'warning' => 'exists-normalized',
1843                                 'file' => $file,
1844                                 'normalizedFile' => $similarFiles[0],
1845                         );
1846                 }
1847
1848                 if ( self::isThumbName( $file->getName() ) ) {
1849                         # Check for filenames like 50px- or 180px-, these are mostly thumbnails
1850                         $nt_thb = Title::newFromText(
1851                                 substr( $partname, strpos( $partname, '-' ) + 1 ) . '.' . $extension,
1852                                 NS_FILE
1853                         );
1854                         $file_thb = wfLocalFile( $nt_thb );
1855                         if ( $file_thb->exists() ) {
1856                                 return array(
1857                                         'warning' => 'thumb',
1858                                         'file' => $file,
1859                                         'thumbFile' => $file_thb
1860                                 );
1861                         } else {
1862                                 // File does not exist, but we just don't like the name
1863                                 return array(
1864                                         'warning' => 'thumb-name',
1865                                         'file' => $file,
1866                                         'thumbFile' => $file_thb
1867                                 );
1868                         }
1869                 }
1870
1871                 foreach ( self::getFilenamePrefixBlacklist() as $prefix ) {
1872                         if ( substr( $partname, 0, strlen( $prefix ) ) == $prefix ) {
1873                                 return array(
1874                                         'warning' => 'bad-prefix',
1875                                         'file' => $file,
1876                                         'prefix' => $prefix
1877                                 );
1878                         }
1879                 }
1880
1881                 return false;
1882         }
1883
1884         /**
1885          * Helper function that checks whether the filename looks like a thumbnail
1886          * @param string $filename
1887          * @return bool
1888          */
1889         public static function isThumbName( $filename ) {
1890                 $n = strrpos( $filename, '.' );
1891                 $partname = $n ? substr( $filename, 0, $n ) : $filename;
1892
1893                 return (
1894                         substr( $partname, 3, 3 ) == 'px-' ||
1895                         substr( $partname, 2, 3 ) == 'px-'
1896                 ) &&
1897                 preg_match( "/[0-9]{2}/", substr( $partname, 0, 2 ) );
1898         }
1899
1900         /**
1901          * Get a list of blacklisted filename prefixes from [[MediaWiki:Filename-prefix-blacklist]]
1902          *
1903          * @return array List of prefixes
1904          */
1905         public static function getFilenamePrefixBlacklist() {
1906                 $blacklist = array();
1907                 $message = wfMessage( 'filename-prefix-blacklist' )->inContentLanguage();
1908                 if ( !$message->isDisabled() ) {
1909                         $lines = explode( "\n", $message->plain() );
1910                         foreach ( $lines as $line ) {
1911                                 // Remove comment lines
1912                                 $comment = substr( trim( $line ), 0, 1 );
1913                                 if ( $comment == '#' || $comment == '' ) {
1914                                         continue;
1915                                 }
1916                                 // Remove additional comments after a prefix
1917                                 $comment = strpos( $line, '#' );
1918                                 if ( $comment > 0 ) {
1919                                         $line = substr( $line, 0, $comment - 1 );
1920                                 }
1921                                 $blacklist[] = trim( $line );
1922                         }
1923                 }
1924
1925                 return $blacklist;
1926         }
1927
1928         /**
1929          * Gets image info about the file just uploaded.
1930          *
1931          * Also has the effect of setting metadata to be an 'indexed tag name' in
1932          * returned API result if 'metadata' was requested. Oddly, we have to pass
1933          * the "result" object down just so it can do that with the appropriate
1934          * format, presumably.
1935          *
1936          * @param ApiResult $result
1937          * @return array Image info
1938          */
1939         public function getImageInfo( $result ) {
1940                 $file = $this->getLocalFile();
1941                 /** @todo This cries out for refactoring.
1942                  *  We really want to say $file->getAllInfo(); here.
1943                  * Perhaps "info" methods should be moved into files, and the API should
1944                  * just wrap them in queries.
1945                  */
1946                 if ( $file instanceof UploadStashFile ) {
1947                         $imParam = ApiQueryStashImageInfo::getPropertyNames();
1948                         $info = ApiQueryStashImageInfo::getInfo( $file, array_flip( $imParam ), $result );
1949                 } else {
1950                         $imParam = ApiQueryImageInfo::getPropertyNames();
1951                         $info = ApiQueryImageInfo::getInfo( $file, array_flip( $imParam ), $result );
1952                 }
1953
1954                 return $info;
1955         }
1956
1957         /**
1958          * @param array $error
1959          * @return Status
1960          */
1961         public function convertVerifyErrorToStatus( $error ) {
1962                 $code = $error['status'];
1963                 unset( $code['status'] );
1964
1965                 return Status::newFatal( $this->getVerificationErrorCode( $code ), $error );
1966         }
1967
1968         /**
1969          * @param null|string $forType
1970          * @return int
1971          */
1972         public static function getMaxUploadSize( $forType = null ) {
1973                 global $wgMaxUploadSize;
1974
1975                 if ( is_array( $wgMaxUploadSize ) ) {
1976                         if ( !is_null( $forType ) && isset( $wgMaxUploadSize[$forType] ) ) {
1977                                 return $wgMaxUploadSize[$forType];
1978                         } else {
1979                                 return $wgMaxUploadSize['*'];
1980                         }
1981                 } else {
1982                         return intval( $wgMaxUploadSize );
1983                 }
1984         }
1985
1986         /**
1987          * Get the current status of a chunked upload (used for polling)
1988          *
1989          * The value will be read from cache.
1990          *
1991          * @param User $user
1992          * @param string $statusKey
1993          * @return Status[]|bool
1994          */
1995         public static function getSessionStatus( User $user, $statusKey ) {
1996                 $key = wfMemcKey( 'uploadstatus', $user->getId() ?: md5( $user->getName() ), $statusKey );
1997
1998                 return wfGetCache( CACHE_ANYTHING )->get( $key );
1999         }
2000
2001         /**
2002          * Set the current status of a chunked upload (used for polling)
2003          *
2004          * The value will be set in cache for 1 day
2005          *
2006          * @param User $user
2007          * @param string $statusKey
2008          * @param array|bool $value
2009          * @return void
2010          */
2011         public static function setSessionStatus( User $user, $statusKey, $value ) {
2012                 $key = wfMemcKey( 'uploadstatus', $user->getId() ?: md5( $user->getName() ), $statusKey );
2013
2014                 $cache = wfGetCache( CACHE_ANYTHING );
2015                 if ( $value === false ) {
2016                         $cache->delete( $key );
2017                 } else {
2018                         $cache->set( $key, $value, 86400 );
2019                 }
2020         }
2021 }