includes/upload/UploadBase.php

   1 <?php
   2 /**
   3  * @file
   4  * @ingroup upload
   5  *
   6  * UploadBase and subclasses are the backend of MediaWiki's file uploads.
   7  * The frontends are formed by ApiUpload and SpecialUpload.
   8  *
   9  * See also includes/docs/upload.txt
  10  *
  11  * @author Brion Vibber
  12  * @author Bryan Tong Minh
  13  * @author Michael Dale
  14  */
  15
  16 abstract class UploadBase {
  17         protected $mTempPath;
  18         protected $mDesiredDestName, $mDestName, $mRemoveTempFile, $mSourceType;
  19         protected $mTitle = false, $mTitleError = 0;
  20         protected $mFilteredName, $mFinalExtension;
  21         protected $mLocalFile, $mFileSize, $mFileProps;
  22         protected $mBlackListedExtensions;
  23         protected $mJavaDetected;
  24
  25         const SUCCESS = 0;
  26         const OK = 0;
  27         const EMPTY_FILE = 3;
  28         const MIN_LENGTH_PARTNAME = 4;
  29         const ILLEGAL_FILENAME = 5;
  30         const OVERWRITE_EXISTING_FILE = 7; # Not used anymore; handled by verifyTitlePermissions()
  31         const FILETYPE_MISSING = 8;
  32         const FILETYPE_BADTYPE = 9;
  33         const VERIFICATION_ERROR = 10;
  34
  35         # HOOK_ABORTED is the new name of UPLOAD_VERIFICATION_ERROR
  36         const UPLOAD_VERIFICATION_ERROR = 11;
  37         const HOOK_ABORTED = 11;
  38         const FILE_TOO_LARGE = 12;
  39         const WINDOWS_NONASCII_FILENAME = 13;
  40
  41         public function getVerificationErrorCode( $error ) {
  42                 $code_to_status = array(self::EMPTY_FILE => 'empty-file',
  43                                                                 self::FILE_TOO_LARGE => 'file-too-large',
  44                                                                 self::FILETYPE_MISSING => 'filetype-missing',
  45                                                                 self::FILETYPE_BADTYPE => 'filetype-banned',
  46                                                                 self::MIN_LENGTH_PARTNAME => 'filename-tooshort',
  47                                                                 self::ILLEGAL_FILENAME => 'illegal-filename',
  48                                                                 self::OVERWRITE_EXISTING_FILE => 'overwrite',
  49                                                                 self::VERIFICATION_ERROR => 'verification-error',
  50                                                                 self::HOOK_ABORTED =>  'hookaborted',
  51                                                                 self::WINDOWS_NONASCII_FILENAME => 'windows-nonascii-filename',
  52                 );
  53                 if( isset( $code_to_status[$error] ) ) {
  54                         return $code_to_status[$error];
  55                 }
  56
  57                 return 'unknown-error';
  58         }
  59
  60         /**
  61          * Returns true if uploads are enabled.
  62          * Can be override by subclasses.
  63          */
  64         public static function isEnabled() {
  65                 global $wgEnableUploads;
  66
  67                 if ( !$wgEnableUploads ) {
  68                         return false;
  69                 }
  70
  71                 # Check php's file_uploads setting
  72                 return wfIsHipHop() || wfIniGetBool( 'file_uploads' );
  73         }
  74
  75         /**
  76          * Returns true if the user can use this upload module or else a string
  77          * identifying the missing permission.
  78          * Can be overriden by subclasses.
  79          *
  80          * @param $user User
  81          */
  82         public static function isAllowed( $user ) {
  83                 foreach ( array( 'upload', 'edit' ) as $permission ) {
  84                         if ( !$user->isAllowed( $permission ) ) {
  85                                 return $permission;
  86                         }
  87                 }
  88                 return true;
  89         }
  90
  91         // Upload handlers. Should probably just be a global.
  92         static $uploadHandlers = array( 'Stash', 'File', 'Url' );
  93
  94         /**
  95          * Create a form of UploadBase depending on wpSourceType and initializes it
  96          *
  97          * @param $request WebRequest
  98          * @param $type
  99          */
 100         public static function createFromRequest( &$request, $type = null ) {
 101                 $type = $type ? $type : $request->getVal( 'wpSourceType', 'File' );
 102
 103                 if( !$type ) {
 104                         return null;
 105                 }
 106
 107                 // Get the upload class
 108                 $type = ucfirst( $type );
 109
 110                 // Give hooks the chance to handle this request
 111                 $className = null;
 112                 wfRunHooks( 'UploadCreateFromRequest', array( $type, &$className ) );
 113                 if ( is_null( $className ) ) {
 114                         $className = 'UploadFrom' . $type;
 115                         wfDebug( __METHOD__ . ": class name: $className\n" );
 116                         if( !in_array( $type, self::$uploadHandlers ) ) {
 117                                 return null;
 118                         }
 119                 }
 120
 121                 // Check whether this upload class is enabled
 122                 if( !call_user_func( array( $className, 'isEnabled' ) ) ) {
 123                         return null;
 124                 }
 125
 126                 // Check whether the request is valid
 127                 if( !call_user_func( array( $className, 'isValidRequest' ), $request ) ) {
 128                         return null;
 129                 }
 130
 131                 $handler = new $className;
 132
 133                 $handler->initializeFromRequest( $request );
 134                 return $handler;
 135         }
 136
 137         /**
 138          * Check whether a request if valid for this handler
 139          */
 140         public static function isValidRequest( $request ) {
 141                 return false;
 142         }
 143
 144         public function __construct() {}
 145
 146         /**
 147          * Returns the upload type. Should be overridden by child classes
 148          *
 149          * @since 1.18
 150          * @return string
 151          */
 152         public function getSourceType() { return null; }
 153
 154         /**
 155          * Initialize the path information
 156          * @param $name string the desired destination name
 157          * @param $tempPath string the temporary path
 158          * @param $fileSize int the file size
 159          * @param $removeTempFile bool (false) remove the temporary file?
 160          * @return null
 161          */
 162         public function initializePathInfo( $name, $tempPath, $fileSize, $removeTempFile = false ) {
 163                 $this->mDesiredDestName = $name;
 164                 $this->mTempPath = $tempPath;
 165                 $this->mFileSize = $fileSize;
 166                 $this->mRemoveTempFile = $removeTempFile;
 167         }
 168
 169         /**
 170          * Initialize from a WebRequest. Override this in a subclass.
 171          */
 172         public abstract function initializeFromRequest( &$request );
 173
 174         /**
 175          * Fetch the file. Usually a no-op
 176          */
 177         public function fetchFile() {
 178                 return Status::newGood();
 179         }
 180
 181         /**
 182          * Return true if the file is empty
 183          * @return bool
 184          */
 185         public function isEmptyFile() {
 186                 return empty( $this->mFileSize );
 187         }
 188
 189         /**
 190          * Return the file size
 191          * @return integer
 192          */
 193         public function getFileSize() {
 194                 return $this->mFileSize;
 195         }
 196
 197         /**
 198          * Append a file to the Repo file
 199          *
 200          * @param $srcPath String: path to source file
 201          * @param $toAppendPath String: path to the Repo file that will be appended to.
 202          * @return Status Status
 203          */
 204         protected function appendToUploadFile( $srcPath, $toAppendPath ) {
 205                 $repo = RepoGroup::singleton()->getLocalRepo();
 206                 $status = $repo->append( $srcPath, $toAppendPath );
 207                 return $status;
 208         }
 209
 210         /**
 211          * Finish appending to the Repo file
 212          *
 213          * @param $toAppendPath String: path to the Repo file that will be appended to.
 214          * @return Status Status
 215          */
 216         protected function appendFinish( $toAppendPath ) {
 217                 $repo = RepoGroup::singleton()->getLocalRepo();
 218                 $status = $repo->appendFinish( $toAppendPath );
 219                 return $status;
 220         }
 221
 222
 223         /**
 224          * @param $srcPath String: the source path
 225          * @return the real path if it was a virtual URL
 226          */
 227         function getRealPath( $srcPath ) {
 228                 $repo = RepoGroup::singleton()->getLocalRepo();
 229                 if ( $repo->isVirtualUrl( $srcPath ) ) {
 230                         return $repo->resolveVirtualUrl( $srcPath );
 231                 }
 232                 return $srcPath;
 233         }
 234
 235         /**
 236          * Verify whether the upload is sane.
 237          * @return mixed self::OK or else an array with error information
 238          */
 239         public function verifyUpload() {
 240                 /**
 241                  * If there was no filename or a zero size given, give up quick.
 242                  */
 243                 if( $this->isEmptyFile() ) {
 244                         return array( 'status' => self::EMPTY_FILE );
 245                 }
 246
 247                 /**
 248                  * Honor $wgMaxUploadSize
 249                  */
 250                 $maxSize = self::getMaxUploadSize( $this->getSourceType() );
 251                 if( $this->mFileSize > $maxSize ) {
 252                         return array(
 253                                 'status' => self::FILE_TOO_LARGE,
 254                                 'max' => $maxSize,
 255                         );
 256                 }
 257
 258                 /**
 259                  * Look at the contents of the file; if we can recognize the
 260                  * type but it's corrupt or data of the wrong type, we should
 261                  * probably not accept it.
 262                  */
 263                 $verification = $this->verifyFile();
 264                 if( $verification !== true ) {
 265                         return array(
 266                                 'status' => self::VERIFICATION_ERROR,
 267                                 'details' => $verification
 268                         );
 269                 }
 270
 271                 /**
 272                  * Make sure this file can be created
 273                  */
 274                 $result = $this->validateName();
 275                 if( $result !== true ) {
 276                         return $result;
 277                 }
 278
 279                 $error = '';
 280                 if( !wfRunHooks( 'UploadVerification',
 281                                 array( $this->mDestName, $this->mTempPath, &$error ) ) ) {
 282                         return array( 'status' => self::HOOK_ABORTED, 'error' => $error );
 283                 }
 284
 285                 return array( 'status' => self::OK );
 286         }
 287
 288         /**
 289          * Verify that the name is valid and, if necessary, that we can overwrite
 290          *
 291          * @return mixed true if valid, otherwise and array with 'status'
 292          * and other keys
 293          **/
 294         protected function validateName() {
 295                 $nt = $this->getTitle();
 296                 if( is_null( $nt ) ) {
 297                         $result = array( 'status' => $this->mTitleError );
 298                         if( $this->mTitleError == self::ILLEGAL_FILENAME ) {
 299                                 $result['filtered'] = $this->mFilteredName;
 300                         }
 301                         if ( $this->mTitleError == self::FILETYPE_BADTYPE ) {
 302                                 $result['finalExt'] = $this->mFinalExtension;
 303                                 if ( count( $this->mBlackListedExtensions ) ) {
 304                                         $result['blacklistedExt'] = $this->mBlackListedExtensions;
 305                                 }
 306                         }
 307                         return $result;
 308                 }
 309                 $this->mDestName = $this->getLocalFile()->getName();
 310
 311                 return true;
 312         }
 313
 314         /**
 315          * Verify the mime type
 316          *
 317          * @param $mime string representing the mime
 318          * @return mixed true if the file is verified, an array otherwise
 319          */
 320         protected function verifyMimeType( $mime ) {
 321                 global $wgVerifyMimeType;
 322                 if ( $wgVerifyMimeType ) {
 323                         wfDebug ( "\n\nmime: <$mime> extension: <{$this->mFinalExtension}>\n\n");
 324                         global $wgMimeTypeBlacklist;
 325                         if ( $this->checkFileExtension( $mime, $wgMimeTypeBlacklist ) ) {
 326                                 return array( 'filetype-badmime', $mime );
 327                         }
 328
 329                         # XXX: Missing extension will be caught by validateName() via getTitle()
 330                         if ( $this->mFinalExtension != '' && !$this->verifyExtension( $mime, $this->mFinalExtension ) ) {
 331                                 return array( 'filetype-mime-mismatch', $this->mFinalExtension, $mime );
 332                         }
 333
 334                         # Check IE type
 335                         $fp = fopen( $this->mTempPath, 'rb' );
 336                         $chunk = fread( $fp, 256 );
 337                         fclose( $fp );
 338
 339                         $magic = MimeMagic::singleton();
 340                         $extMime = $magic->guessTypesForExtension( $this->mFinalExtension );
 341                         $ieTypes = $magic->getIEMimeTypes( $this->mTempPath, $chunk, $extMime );
 342                         foreach ( $ieTypes as $ieType ) {
 343                                 if ( $this->checkFileExtension( $ieType, $wgMimeTypeBlacklist ) ) {
 344                                         return array( 'filetype-bad-ie-mime', $ieType );
 345                                 }
 346                         }
 347                 }
 348
 349                 return true;
 350         }
 351
 352         /**
 353          * Verifies that it's ok to include the uploaded file
 354          *
 355          * @return mixed true of the file is verified, array otherwise.
 356          */
 357         protected function verifyFile() {
 358                 global $wgAllowJavaUploads;
 359                 # get the title, even though we are doing nothing with it, because
 360                 # we need to populate mFinalExtension
 361                 $this->getTitle();
 362
 363                 $this->mFileProps = File::getPropsFromPath( $this->mTempPath, $this->mFinalExtension );
 364
 365                 # check mime type, if desired
 366                 $mime = $this->mFileProps[ 'file-mime' ];
 367                 $status = $this->verifyMimeType( $mime );
 368                 if ( $status !== true ) {
 369                         return $status;
 370                 }
 371
 372                 # check for htmlish code and javascript
 373                 if( self::detectScript( $this->mTempPath, $mime, $this->mFinalExtension ) ) {
 374                         return array( 'uploadscripted' );
 375                 }
 376                 if( $this->mFinalExtension == 'svg' || $mime == 'image/svg+xml' ) {
 377                         if( $this->detectScriptInSvg( $this->mTempPath ) ) {
 378                                 return array( 'uploadscripted' );
 379                         }
 380                 }
 381
 382                 # Check for Java applets, which if uploaded can bypass cross-site
 383                 # restrictions.
 384                 if ( !$wgAllowJavaUploads ) {
 385                         $this->mJavaDetected = false;
 386                         $zipStatus = ZipDirectoryReader::read( $this->mTempPath,
 387                                 array( $this, 'zipEntryCallback' ) );
 388                         if ( !$zipStatus->isOK() ) {
 389                                 $errors = $zipStatus->getErrorsArray();
 390                                 $error = reset( $errors );
 391                                 if ( $error[0] !== 'zip-wrong-format' ) {
 392                                         return $error;
 393                                 }
 394                         }
 395                         if ( $this->mJavaDetected ) {
 396                                 return array( 'uploadjava' );
 397                         }
 398                 }
 399
 400                 # Scan the uploaded file for viruses
 401                 $virus = $this->detectVirus( $this->mTempPath );
 402                 if ( $virus ) {
 403                         return array( 'uploadvirus', $virus );
 404                 }
 405
 406                 $handler = MediaHandler::getHandler( $mime );
 407                 if ( $handler ) {
 408                         $handlerStatus = $handler->verifyUpload( $this->mTempPath );
 409                         if ( !$handlerStatus->isOK() ) {
 410                                 $errors = $handlerStatus->getErrorsArray();
 411                                 return reset( $errors );
 412                         }
 413                 }
 414
 415                 wfRunHooks( 'UploadVerifyFile', array( $this, $mime, &$status ) );
 416                 if ( $status !== true ) {
 417                         return $status;
 418                 }
 419
 420                 wfDebug( __METHOD__ . ": all clear; passing.\n" );
 421                 return true;
 422         }
 423
 424         /**
 425          * Callback for ZipDirectoryReader to detect Java class files.
 426          */
 427         function zipEntryCallback( $entry ) {
 428                 $names = array( $entry['name'] );
 429
 430                 // If there is a null character, cut off the name at it, because JDK's
 431                 // ZIP_GetEntry() uses strcmp() if the name hashes match. If a file name
 432                 // were constructed which had ".class\0" followed by a string chosen to
 433                 // make the hash collide with the truncated name, that file could be
 434                 // returned in response to a request for the .class file.
 435                 $nullPos = strpos( $entry['name'], "\000" );
 436                 if ( $nullPos !== false ) {
 437                         $names[] = substr( $entry['name'], 0, $nullPos );
 438                 }
 439
 440                 // If there is a trailing slash in the file name, we have to strip it,
 441                 // because that's what ZIP_GetEntry() does.
 442                 if ( preg_grep( '!\.class/?$!', $names ) ) {
 443                         $this->mJavaDetected = true;
 444                 }
 445         }
 446
 447         /**
 448          * Alias for verifyTitlePermissions. The function was originally 'verifyPermissions'
 449          * but that suggests it's checking the user, when it's really checking the title + user combination.
 450          * @param $user User object to verify the permissions against
 451          * @return mixed An array as returned by getUserPermissionsErrors or true
 452          *               in case the user has proper permissions.
 453          */
 454         public function verifyPermissions( $user ) {
 455                 return $this->verifyTitlePermissions( $user );
 456         }
 457
 458         /**
 459          * Check whether the user can edit, upload and create the image. This
 460          * checks only against the current title; if it returns errors, it may
 461          * very well be that another title will not give errors. Therefore
 462          * isAllowed() should be called as well for generic is-user-blocked or
 463          * can-user-upload checking.
 464          *
 465          * @param $user User object to verify the permissions against
 466          * @return mixed An array as returned by getUserPermissionsErrors or true
 467          *               in case the user has proper permissions.
 468          */
 469         public function verifyTitlePermissions( $user ) {
 470                 /**
 471                  * If the image is protected, non-sysop users won't be able
 472                  * to modify it by uploading a new revision.
 473                  */
 474                 $nt = $this->getTitle();
 475                 if( is_null( $nt ) ) {
 476                         return true;
 477                 }
 478                 $permErrors = $nt->getUserPermissionsErrors( 'edit', $user );
 479                 $permErrorsUpload = $nt->getUserPermissionsErrors( 'upload', $user );
 480                 if ( !$nt->exists() ) {
 481                         $permErrorsCreate = $nt->getUserPermissionsErrors( 'createpage', $user );
 482                 } else {
 483                         $permErrorsCreate = array();
 484                 }
 485                 if( $permErrors || $permErrorsUpload || $permErrorsCreate ) {
 486                         $permErrors = array_merge( $permErrors, wfArrayDiff2( $permErrorsUpload, $permErrors ) );
 487                         $permErrors = array_merge( $permErrors, wfArrayDiff2( $permErrorsCreate, $permErrors ) );
 488                         return $permErrors;
 489                 }
 490
 491                 $overwriteError = $this->checkOverwrite( $user );
 492                 if ( $overwriteError !== true ) {
 493                         return array( $overwriteError );
 494                 }
 495
 496                 return true;
 497         }
 498
 499         /**
 500          * Check for non fatal problems with the file
 501          *
 502          * @return Array of warnings
 503          */
 504         public function checkWarnings() {
 505                 global $wgLang;
 506
 507                 $warnings = array();
 508
 509                 $localFile = $this->getLocalFile();
 510                 $filename = $localFile->getName();
 511
 512                 /**
 513                  * Check whether the resulting filename is different from the desired one,
 514                  * but ignore things like ucfirst() and spaces/underscore things
 515                  */
 516                 $comparableName = str_replace( ' ', '_', $this->mDesiredDestName );
 517                 $comparableName = Title::capitalize( $comparableName, NS_FILE );
 518
 519                 if( $this->mDesiredDestName != $filename && $comparableName != $filename ) {
 520                         $warnings['badfilename'] = $filename;
 521                 }
 522
 523                 // Check whether the file extension is on the unwanted list
 524                 global $wgCheckFileExtensions, $wgFileExtensions;
 525                 if ( $wgCheckFileExtensions ) {
 526                         if ( !$this->checkFileExtension( $this->mFinalExtension, $wgFileExtensions ) ) {
 527                                 $warnings['filetype-unwanted-type'] = array( $this->mFinalExtension,
 528                                         $wgLang->commaList( $wgFileExtensions ), count( $wgFileExtensions ) );
 529                         }
 530                 }
 531
 532                 global $wgUploadSizeWarning;
 533                 if ( $wgUploadSizeWarning && ( $this->mFileSize > $wgUploadSizeWarning ) ) {
 534                         $warnings['large-file'] = $wgUploadSizeWarning;
 535                 }
 536
 537                 if ( $this->mFileSize == 0 ) {
 538                         $warnings['emptyfile'] = true;
 539                 }
 540
 541                 $exists = self::getExistsWarning( $localFile );
 542                 if( $exists !== false ) {
 543                         $warnings['exists'] = $exists;
 544                 }
 545
 546                 // Check dupes against existing files
 547                 $hash = File::sha1Base36( $this->mTempPath );
 548                 $dupes = RepoGroup::singleton()->findBySha1( $hash );
 549                 $title = $this->getTitle();
 550                 // Remove all matches against self
 551                 foreach ( $dupes as $key => $dupe ) {
 552                         if( $title->equals( $dupe->getTitle() ) ) {
 553                                 unset( $dupes[$key] );
 554                         }
 555                 }
 556                 if( $dupes ) {
 557                         $warnings['duplicate'] = $dupes;
 558                 }
 559
 560                 // Check dupes against archives
 561                 $archivedImage = new ArchivedFile( null, 0, "{$hash}.{$this->mFinalExtension}" );
 562                 if ( $archivedImage->getID() > 0 ) {
 563                         $warnings['duplicate-archive'] = $archivedImage->getName();
 564                 }
 565
 566                 return $warnings;
 567         }
 568
 569         /**
 570          * Really perform the upload. Stores the file in the local repo, watches
 571          * if necessary and runs the UploadComplete hook.
 572          *
 573          * @param $user User
 574          *
 575          * @return Status indicating the whether the upload succeeded.
 576          */
 577         public function performUpload( $comment, $pageText, $watch, $user ) {
 578                 $status = $this->getLocalFile()->upload(
 579                         $this->mTempPath,
 580                         $comment,
 581                         $pageText,
 582                         File::DELETE_SOURCE,
 583                         $this->mFileProps,
 584                         false,
 585                         $user
 586                 );
 587
 588                 if( $status->isGood() ) {
 589                         if ( $watch ) {
 590                                 $user->addWatch( $this->getLocalFile()->getTitle() );
 591                         }
 592
 593                         wfRunHooks( 'UploadComplete', array( &$this ) );
 594                 }
 595
 596                 return $status;
 597         }
 598
 599         /**
 600          * Returns the title of the file to be uploaded. Sets mTitleError in case
 601          * the name was illegal.
 602          *
 603          * @return Title The title of the file or null in case the name was illegal
 604          */
 605         public function getTitle() {
 606                 if ( $this->mTitle !== false ) {
 607                         return $this->mTitle;
 608                 }
 609
 610                 /* Assume that if a user specified File:Something.jpg, this is an error
 611                  * and that the namespace prefix needs to be stripped of.
 612                  */
 613                 $title = Title::newFromText( $this->mDesiredDestName );
 614                 if ( $title->getNamespace() == NS_FILE ) {
 615                         $this->mFilteredName = $title->getDBkey();
 616                 } else {
 617                         $this->mFilteredName = $this->mDesiredDestName;
 618                 }
 619
 620                 /**
 621                  * Chop off any directories in the given filename. Then
 622                  * filter out illegal characters, and try to make a legible name
 623                  * out of it. We'll strip some silently that Title would die on.
 624                  */
 625                 $this->mFilteredName = wfStripIllegalFilenameChars( $this->mFilteredName );
 626                 /* Normalize to title form before we do any further processing */
 627                 $nt = Title::makeTitleSafe( NS_FILE, $this->mFilteredName );
 628                 if( is_null( $nt ) ) {
 629                         $this->mTitleError = self::ILLEGAL_FILENAME;
 630                         return $this->mTitle = null;
 631                 }
 632                 $this->mFilteredName = $nt->getDBkey();
 633
 634                 /**
 635                  * We'll want to blacklist against *any* 'extension', and use
 636                  * only the final one for the whitelist.
 637                  */
 638                 list( $partname, $ext ) = $this->splitExtensions( $this->mFilteredName );
 639
 640                 if( count( $ext ) ) {
 641                         $this->mFinalExtension = trim( $ext[count( $ext ) - 1] );
 642                 } else {
 643                         $this->mFinalExtension = '';
 644
 645                         # No extension, try guessing one
 646                         $magic = MimeMagic::singleton();
 647                         $mime = $magic->guessMimeType( $this->mTempPath );
 648                         if ( $mime !== 'unknown/unknown' ) {
 649                                 # Get a space separated list of extensions
 650                                 $extList = $magic->getExtensionsForType( $mime );
 651                                 if ( $extList ) {
 652                                         # Set the extension to the canonical extension
 653                                         $this->mFinalExtension = strtok( $extList, ' ' );
 654
 655                                         # Fix up the other variables
 656                                         $this->mFilteredName .= ".{$this->mFinalExtension}";
 657                                         $nt = Title::makeTitleSafe( NS_FILE, $this->mFilteredName );
 658                                         $ext = array( $this->mFinalExtension );
 659                                 }
 660                         }
 661
 662                 }
 663
 664                 /* Don't allow users to override the blacklist (check file extension) */
 665                 global $wgCheckFileExtensions, $wgStrictFileExtensions;
 666                 global $wgFileExtensions, $wgFileBlacklist;
 667
 668                 $blackListedExtensions = $this->checkFileExtensionList( $ext, $wgFileBlacklist );
 669
 670                 if ( $this->mFinalExtension == '' ) {
 671                         $this->mTitleError = self::FILETYPE_MISSING;
 672                         return $this->mTitle = null;
 673                 } elseif ( $blackListedExtensions ||
 674                                 ( $wgCheckFileExtensions && $wgStrictFileExtensions &&
 675                                         !$this->checkFileExtension( $this->mFinalExtension, $wgFileExtensions ) ) ) {
 676                         $this->mBlackListedExtensions = $blackListedExtensions;
 677                         $this->mTitleError = self::FILETYPE_BADTYPE;
 678                         return $this->mTitle = null;
 679                 }
 680
 681                 // Windows may be broken with special characters, see bug XXX
 682                 if ( wfIsWindows() && !preg_match( '/^[\x0-\x7f]*$/', $nt->getText() ) ) {
 683                         $this->mTitleError = self::WINDOWS_NONASCII_FILENAME;
 684                         return $this->mTitle = null;
 685                 }
 686
 687                 # If there was more than one "extension", reassemble the base
 688                 # filename to prevent bogus complaints about length
 689                 if( count( $ext ) > 1 ) {
 690                         for( $i = 0; $i < count( $ext ) - 1; $i++ ) {
 691                                 $partname .= '.' . $ext[$i];
 692                         }
 693                 }
 694
 695                 if( strlen( $partname ) < 1 ) {
 696                         $this->mTitleError =  self::MIN_LENGTH_PARTNAME;
 697                         return $this->mTitle = null;
 698                 }
 699
 700                 return $this->mTitle = $nt;
 701         }
 702
 703         /**
 704          * Return the local file and initializes if necessary.
 705          *
 706          * @return LocalFile
 707          */
 708         public function getLocalFile() {
 709                 if( is_null( $this->mLocalFile ) ) {
 710                         $nt = $this->getTitle();
 711                         $this->mLocalFile = is_null( $nt ) ? null : wfLocalFile( $nt );
 712                 }
 713                 return $this->mLocalFile;
 714         }
 715
 716         /**
 717          * NOTE: Probably should be deprecated in favor of UploadStash, but this is sometimes
 718          * called outside that context.
 719          *
 720          * Stash a file in a temporary directory for later processing
 721          * after the user has confirmed it.
 722          *
 723          * If the user doesn't explicitly cancel or accept, these files
 724          * can accumulate in the temp directory.
 725          *
 726          * @param $saveName String: the destination filename
 727          * @param $tempSrc String: the source temporary file to save
 728          * @return String: full path the stashed file, or false on failure
 729          */
 730         protected function saveTempUploadedFile( $saveName, $tempSrc ) {
 731                 $repo = RepoGroup::singleton()->getLocalRepo();
 732                 $status = $repo->storeTemp( $saveName, $tempSrc );
 733                 return $status;
 734         }
 735
 736         /**
 737          * If the user does not supply all necessary information in the first upload form submission (either by accident or
 738          * by design) then we may want to stash the file temporarily, get more information, and publish the file later.
 739          *
 740          * This method will stash a file in a temporary directory for later processing, and save the necessary descriptive info
 741          * into the database.
 742          * This method returns the file object, which also has a 'fileKey' property which can be passed through a form or
 743          * API request to find this stashed file again.
 744          *
 745          * @param $key String: (optional) the file key used to find the file info again. If not supplied, a key will be autogenerated.
 746          * @return UploadStashFile stashed file
 747          */
 748         public function stashFile( $key = null ) {
 749                 // was stashSessionFile
 750                 $stash = RepoGroup::singleton()->getLocalRepo()->getUploadStash();
 751
 752                 $file = $stash->stashFile( $this->mTempPath, $this->getSourceType(), $key );
 753                 $this->mLocalFile = $file;
 754                 return $file;
 755         }
 756
 757         /**
 758          * Stash a file in a temporary directory, returning a key which can be used to find the file again. See stashFile().
 759          *
 760          * @param $key String: (optional) the file key used to find the file info again. If not supplied, a key will be autogenerated.
 761          * @return String: file key
 762          */
 763         public function stashFileGetKey( $key = null ) {
 764                 return $this->stashFile( $key )->getFileKey();
 765         }
 766
 767         /**
 768          * alias for stashFileGetKey, for backwards compatibility
 769          *
 770          * @param $key String: (optional) the file key used to find the file info again. If not supplied, a key will be autogenerated.
 771          * @return String: file key
 772          */
 773         public function stashSession( $key = null ) {
 774                 return $this->stashFileGetKey( $key );
 775         }
 776
 777         /**
 778          * If we've modified the upload file we need to manually remove it
 779          * on exit to clean up.
 780          */
 781         public function cleanupTempFile() {
 782                 if ( $this->mRemoveTempFile && $this->mTempPath && file_exists( $this->mTempPath ) ) {
 783                         wfDebug( __METHOD__ . ": Removing temporary file {$this->mTempPath}\n" );
 784                         unlink( $this->mTempPath );
 785                 }
 786         }
 787
 788         public function getTempPath() {
 789                 return $this->mTempPath;
 790         }
 791
 792         /**
 793          * Split a file into a base name and all dot-delimited 'extensions'
 794          * on the end. Some web server configurations will fall back to
 795          * earlier pseudo-'extensions' to determine type and execute
 796          * scripts, so the blacklist needs to check them all.
 797          *
 798          * @return array
 799          */
 800         public static function splitExtensions( $filename ) {
 801                 $bits = explode( '.', $filename );
 802                 $basename = array_shift( $bits );
 803                 return array( $basename, $bits );
 804         }
 805
 806         /**
 807          * Perform case-insensitive match against a list of file extensions.
 808          * Returns true if the extension is in the list.
 809          *
 810          * @param $ext String
 811          * @param $list Array
 812          * @return Boolean
 813          */
 814         public static function checkFileExtension( $ext, $list ) {
 815                 return in_array( strtolower( $ext ), $list );
 816         }
 817
 818         /**
 819          * Perform case-insensitive match against a list of file extensions.
 820          * Returns an array of matching extensions.
 821          *
 822          * @param $ext Array
 823          * @param $list Array
 824          * @return Boolean
 825          */
 826         public static function checkFileExtensionList( $ext, $list ) {
 827                 return array_intersect( array_map( 'strtolower', $ext ), $list );
 828         }
 829
 830         /**
 831          * Checks if the mime type of the uploaded file matches the file extension.
 832          *
 833          * @param $mime String: the mime type of the uploaded file
 834          * @param $extension String: the filename extension that the file is to be served with
 835          * @return Boolean
 836          */
 837         public static function verifyExtension( $mime, $extension ) {
 838                 $magic = MimeMagic::singleton();
 839
 840                 if ( !$mime || $mime == 'unknown' || $mime == 'unknown/unknown' )
 841                         if ( !$magic->isRecognizableExtension( $extension ) ) {
 842                                 wfDebug( __METHOD__ . ": passing file with unknown detected mime type; " .
 843                                         "unrecognized extension '$extension', can't verify\n" );
 844                                 return true;
 845                         } else {
 846                                 wfDebug( __METHOD__ . ": rejecting file with unknown detected mime type; ".
 847                                         "recognized extension '$extension', so probably invalid file\n" );
 848                                 return false;
 849                         }
 850
 851                 $match = $magic->isMatchingExtension( $extension, $mime );
 852
 853                 if ( $match === null ) {
 854                         wfDebug( __METHOD__ . ": no file extension known for mime type $mime, passing file\n" );
 855                         return true;
 856                 } elseif( $match === true ) {
 857                         wfDebug( __METHOD__ . ": mime type $mime matches extension $extension, passing file\n" );
 858
 859                         #TODO: if it's a bitmap, make sure PHP or ImageMagic resp. can handle it!
 860                         return true;
 861
 862                 } else {
 863                         wfDebug( __METHOD__ . ": mime type $mime mismatches file extension $extension, rejecting file\n" );
 864                         return false;
 865                 }
 866         }
 867
 868         /**
 869          * Heuristic for detecting files that *could* contain JavaScript instructions or
 870          * things that may look like HTML to a browser and are thus
 871          * potentially harmful. The present implementation will produce false
 872          * positives in some situations.
 873          *
 874          * @param $file String: pathname to the temporary upload file
 875          * @param $mime String: the mime type of the file
 876          * @param $extension String: the extension of the file
 877          * @return Boolean: true if the file contains something looking like embedded scripts
 878          */
 879         public static function detectScript( $file, $mime, $extension ) {
 880                 global $wgAllowTitlesInSVG;
 881
 882                 # ugly hack: for text files, always look at the entire file.
 883                 # For binary field, just check the first K.
 884
 885                 if( strpos( $mime,'text/' ) === 0 ) {
 886                         $chunk = file_get_contents( $file );
 887                 } else {
 888                         $fp = fopen( $file, 'rb' );
 889                         $chunk = fread( $fp, 1024 );
 890                         fclose( $fp );
 891                 }
 892
 893                 $chunk = strtolower( $chunk );
 894
 895                 if( !$chunk ) {
 896                         return false;
 897                 }
 898
 899                 # decode from UTF-16 if needed (could be used for obfuscation).
 900                 if( substr( $chunk, 0, 2 ) == "\xfe\xff" ) {
 901                         $enc = 'UTF-16BE';
 902                 } elseif( substr( $chunk, 0, 2 ) == "\xff\xfe" ) {
 903                         $enc = 'UTF-16LE';
 904                 } else {
 905                         $enc = null;
 906                 }
 907
 908                 if( $enc ) {
 909                         $chunk = iconv( $enc, "ASCII//IGNORE", $chunk );
 910                 }
 911
 912                 $chunk = trim( $chunk );
 913
 914                 # @todo FIXME: Convert from UTF-16 if necessarry!
 915                 wfDebug( __METHOD__ . ": checking for embedded scripts and HTML stuff\n" );
 916
 917                 # check for HTML doctype
 918                 if ( preg_match( "/<!DOCTYPE *X?HTML/i", $chunk ) ) {
 919                         return true;
 920                 }
 921
 922                 /**
 923                  * Internet Explorer for Windows performs some really stupid file type
 924                  * autodetection which can cause it to interpret valid image files as HTML
 925                  * and potentially execute JavaScript, creating a cross-site scripting
 926                  * attack vectors.
 927                  *
 928                  * Apple's Safari browser also performs some unsafe file type autodetection
 929                  * which can cause legitimate files to be interpreted as HTML if the
 930                  * web server is not correctly configured to send the right content-type
 931                  * (or if you're really uploading plain text and octet streams!)
 932                  *
 933                  * Returns true if IE is likely to mistake the given file for HTML.
 934                  * Also returns true if Safari would mistake the given file for HTML
 935                  * when served with a generic content-type.
 936                  */
 937                 $tags = array(
 938                         '<a href',
 939                         '<body',
 940                         '<head',
 941                         '<html',   #also in safari
 942                         '<img',
 943                         '<pre',
 944                         '<script', #also in safari
 945                         '<table'
 946                 );
 947
 948                 if( !$wgAllowTitlesInSVG && $extension !== 'svg' && $mime !== 'image/svg' ) {
 949                         $tags[] = '<title';
 950                 }
 951
 952                 foreach( $tags as $tag ) {
 953                         if( false !== strpos( $chunk, $tag ) ) {
 954                                 wfDebug( __METHOD__ . ": found something that may make it be mistaken for html: $tag\n" );
 955                                 return true;
 956                         }
 957                 }
 958
 959                 /*
 960                  * look for JavaScript
 961                  */
 962
 963                 # resolve entity-refs to look at attributes. may be harsh on big files... cache result?
 964                 $chunk = Sanitizer::decodeCharReferences( $chunk );
 965
 966                 # look for script-types
 967                 if( preg_match( '!type\s*=\s*[\'"]?\s*(?:\w*/)?(?:ecma|java)!sim', $chunk ) ) {
 968                         wfDebug( __METHOD__ . ": found script types\n" );
 969                         return true;
 970                 }
 971
 972                 # look for html-style script-urls
 973                 if( preg_match( '!(?:href|src|data)\s*=\s*[\'"]?\s*(?:ecma|java)script:!sim', $chunk ) ) {
 974                         wfDebug( __METHOD__ . ": found html-style script urls\n" );
 975                         return true;
 976                 }
 977
 978                 # look for css-style script-urls
 979                 if( preg_match( '!url\s*\(\s*[\'"]?\s*(?:ecma|java)script:!sim', $chunk ) ) {
 980                         wfDebug( __METHOD__ . ": found css-style script urls\n" );
 981                         return true;
 982                 }
 983
 984                 wfDebug( __METHOD__ . ": no scripts found\n" );
 985                 return false;
 986         }
 987
 988         protected function detectScriptInSvg( $filename ) {
 989                 $check = new XmlTypeCheck( $filename, array( $this, 'checkSvgScriptCallback' ) );
 990                 return $check->filterMatch;
 991         }
 992
 993         /**
 994          * @todo Replace this with a whitelist filter!
 995          */
 996         public function checkSvgScriptCallback( $element, $attribs ) {
 997                 $stripped = $this->stripXmlNamespace( $element );
 998
 999                 if( $stripped == 'script' ) {
1000                         wfDebug( __METHOD__ . ": Found script element '$element' in uploaded file.\n" );
1001                         return true;
1002                 }
1003
1004                 foreach( $attribs as $attrib => $value ) {
1005                         $stripped = $this->stripXmlNamespace( $attrib );
1006                         if( substr( $stripped, 0, 2 ) == 'on' ) {
1007                                 wfDebug( __METHOD__ . ": Found script attribute '$attrib'='value' in uploaded file.\n" );
1008                                 return true;
1009                         }
1010                         if( $stripped == 'href' && strpos( strtolower( $value ), 'javascript:' ) !== false ) {
1011                                 wfDebug( __METHOD__ . ": Found script href attribute '$attrib'='$value' in uploaded file.\n" );
1012                                 return true;
1013                         }
1014                 }
1015         }
1016
1017         private function stripXmlNamespace( $name ) {
1018                 // 'http://www.w3.org/2000/svg:script' -> 'script'
1019                 $parts = explode( ':', strtolower( $name ) );
1020                 return array_pop( $parts );
1021         }
1022
1023         /**
1024          * Generic wrapper function for a virus scanner program.
1025          * This relies on the $wgAntivirus and $wgAntivirusSetup variables.
1026          * $wgAntivirusRequired may be used to deny upload if the scan fails.
1027          *
1028          * @param $file String: pathname to the temporary upload file
1029          * @return mixed false if not virus is found, NULL if the scan fails or is disabled,
1030          *         or a string containing feedback from the virus scanner if a virus was found.
1031          *         If textual feedback is missing but a virus was found, this function returns true.
1032          */
1033         public static function detectVirus( $file ) {
1034                 global $wgAntivirus, $wgAntivirusSetup, $wgAntivirusRequired, $wgOut;
1035
1036                 if ( !$wgAntivirus ) {
1037                         wfDebug( __METHOD__ . ": virus scanner disabled\n" );
1038                         return null;
1039                 }
1040
1041                 if ( !$wgAntivirusSetup[$wgAntivirus] ) {
1042                         wfDebug( __METHOD__ . ": unknown virus scanner: $wgAntivirus\n" );
1043                         $wgOut->wrapWikiMsg( "<div class=\"error\">\n$1\n</div>",
1044                                 array( 'virus-badscanner', $wgAntivirus ) );
1045                         return wfMsg( 'virus-unknownscanner' ) . " $wgAntivirus";
1046                 }
1047
1048                 # look up scanner configuration
1049                 $command = $wgAntivirusSetup[$wgAntivirus]['command'];
1050                 $exitCodeMap = $wgAntivirusSetup[$wgAntivirus]['codemap'];
1051                 $msgPattern = isset( $wgAntivirusSetup[$wgAntivirus]['messagepattern'] ) ?
1052                         $wgAntivirusSetup[$wgAntivirus]['messagepattern'] : null;
1053
1054                 if ( strpos( $command, "%f" ) === false ) {
1055                         # simple pattern: append file to scan
1056                         $command .= " " . wfEscapeShellArg( $file );
1057                 } else {
1058                         # complex pattern: replace "%f" with file to scan
1059                         $command = str_replace( "%f", wfEscapeShellArg( $file ), $command );
1060                 }
1061
1062                 wfDebug( __METHOD__ . ": running virus scan: $command \n" );
1063
1064                 # execute virus scanner
1065                 $exitCode = false;
1066
1067                 # NOTE: there's a 50 line workaround to make stderr redirection work on windows, too.
1068                 #      that does not seem to be worth the pain.
1069                 #      Ask me (Duesentrieb) about it if it's ever needed.
1070                 $output = wfShellExec( "$command 2>&1", $exitCode );
1071
1072                 # map exit code to AV_xxx constants.
1073                 $mappedCode = $exitCode;
1074                 if ( $exitCodeMap ) {
1075                         if ( isset( $exitCodeMap[$exitCode] ) ) {
1076                                 $mappedCode = $exitCodeMap[$exitCode];
1077                         } elseif ( isset( $exitCodeMap["*"] ) ) {
1078                                 $mappedCode = $exitCodeMap["*"];
1079                         }
1080                 }
1081
1082                 if ( $mappedCode === AV_SCAN_FAILED ) {
1083                         # scan failed (code was mapped to false by $exitCodeMap)
1084                         wfDebug( __METHOD__ . ": failed to scan $file (code $exitCode).\n" );
1085
1086                         if ( $wgAntivirusRequired ) {
1087                                 return wfMsg( 'virus-scanfailed', array( $exitCode ) );
1088                         } else {
1089                                 return null;
1090                         }
1091                 } elseif ( $mappedCode === AV_SCAN_ABORTED ) {
1092                         # scan failed because filetype is unknown (probably imune)
1093                         wfDebug( __METHOD__ . ": unsupported file type $file (code $exitCode).\n" );
1094                         return null;
1095                 } elseif ( $mappedCode === AV_NO_VIRUS ) {
1096                         # no virus found
1097                         wfDebug( __METHOD__ . ": file passed virus scan.\n" );
1098                         return false;
1099                 } else {
1100                         $output = trim( $output );
1101
1102                         if ( !$output ) {
1103                                 $output = true; #if there's no output, return true
1104                         } elseif ( $msgPattern ) {
1105                                 $groups = array();
1106                                 if ( preg_match( $msgPattern, $output, $groups ) ) {
1107                                         if ( $groups[1] ) {
1108                                                 $output = $groups[1];
1109                                         }
1110                                 }
1111                         }
1112
1113                         wfDebug( __METHOD__ . ": FOUND VIRUS! scanner feedback: $output \n" );
1114                         return $output;
1115                 }
1116         }
1117
1118         /**
1119          * Check if there's an overwrite conflict and, if so, if restrictions
1120          * forbid this user from performing the upload.
1121          *
1122          * @param $user User
1123          *
1124          * @return mixed true on success, array on failure
1125          */
1126         private function checkOverwrite( $user ) {
1127                 // First check whether the local file can be overwritten
1128                 $file = $this->getLocalFile();
1129                 if( $file->exists() ) {
1130                         if( !self::userCanReUpload( $user, $file ) ) {
1131                                 return array( 'fileexists-forbidden', $file->getName() );
1132                         } else {
1133                                 return true;
1134                         }
1135                 }
1136
1137                 /* Check shared conflicts: if the local file does not exist, but
1138                  * wfFindFile finds a file, it exists in a shared repository.
1139                  */
1140                 $file = wfFindFile( $this->getTitle() );
1141                 if ( $file && !$user->isAllowed( 'reupload-shared' ) ) {
1142                         return array( 'fileexists-shared-forbidden', $file->getName() );
1143                 }
1144
1145                 return true;
1146         }
1147
1148         /**
1149          * Check if a user is the last uploader
1150          *
1151          * @param $user User object
1152          * @param $img String: image name
1153          * @return Boolean
1154          */
1155         public static function userCanReUpload( User $user, $img ) {
1156                 if( $user->isAllowed( 'reupload' ) ) {
1157                         return true; // non-conditional
1158                 }
1159                 if( !$user->isAllowed( 'reupload-own' ) ) {
1160                         return false;
1161                 }
1162                 if( is_string( $img ) ) {
1163                         $img = wfLocalFile( $img );
1164                 }
1165                 if ( !( $img instanceof LocalFile ) ) {
1166                         return false;
1167                 }
1168
1169                 return $user->getId() == $img->getUser( 'id' );
1170         }
1171
1172         /**
1173          * Helper function that does various existence checks for a file.
1174          * The following checks are performed:
1175          * - The file exists
1176          * - Article with the same name as the file exists
1177          * - File exists with normalized extension
1178          * - The file looks like a thumbnail and the original exists
1179          *
1180          * @param $file File The File object to check
1181          * @return mixed False if the file does not exists, else an array
1182          */
1183         public static function getExistsWarning( $file ) {
1184                 if( $file->exists() ) {
1185                         return array( 'warning' => 'exists', 'file' => $file );
1186                 }
1187
1188                 if( $file->getTitle()->getArticleID() ) {
1189                         return array( 'warning' => 'page-exists', 'file' => $file );
1190                 }
1191
1192                 if ( $file->wasDeleted() && !$file->exists() ) {
1193                         return array( 'warning' => 'was-deleted', 'file' => $file );
1194                 }
1195
1196                 if( strpos( $file->getName(), '.' ) == false ) {
1197                         $partname = $file->getName();
1198                         $extension = '';
1199                 } else {
1200                         $n = strrpos( $file->getName(), '.' );
1201                         $extension = substr( $file->getName(), $n + 1 );
1202                         $partname = substr( $file->getName(), 0, $n );
1203                 }
1204                 $normalizedExtension = File::normalizeExtension( $extension );
1205
1206                 if ( $normalizedExtension != $extension ) {
1207                         // We're not using the normalized form of the extension.
1208                         // Normal form is lowercase, using most common of alternate
1209                         // extensions (eg 'jpg' rather than 'JPEG').
1210                         //
1211                         // Check for another file using the normalized form...
1212                         $nt_lc = Title::makeTitle( NS_FILE, "{$partname}.{$normalizedExtension}" );
1213                         $file_lc = wfLocalFile( $nt_lc );
1214
1215                         if( $file_lc->exists() ) {
1216                                 return array(
1217                                         'warning' => 'exists-normalized',
1218                                         'file' => $file,
1219                                         'normalizedFile' => $file_lc
1220                                 );
1221                         }
1222                 }
1223
1224                 if ( self::isThumbName( $file->getName() ) ) {
1225                         # Check for filenames like 50px- or 180px-, these are mostly thumbnails
1226                         $nt_thb = Title::newFromText( substr( $partname , strpos( $partname , '-' ) +1 ) . '.' . $extension, NS_FILE );
1227                         $file_thb = wfLocalFile( $nt_thb );
1228                         if( $file_thb->exists() ) {
1229                                 return array(
1230                                         'warning' => 'thumb',
1231                                         'file' => $file,
1232                                         'thumbFile' => $file_thb
1233                                 );
1234                         } else {
1235                                 // File does not exist, but we just don't like the name
1236                                 return array(
1237                                         'warning' => 'thumb-name',
1238                                         'file' => $file,
1239                                         'thumbFile' => $file_thb
1240                                 );
1241                         }
1242                 }
1243
1244
1245                 foreach( self::getFilenamePrefixBlacklist() as $prefix ) {
1246                         if ( substr( $partname, 0, strlen( $prefix ) ) == $prefix ) {
1247                                 return array(
1248                                         'warning' => 'bad-prefix',
1249                                         'file' => $file,
1250                                         'prefix' => $prefix
1251                                 );
1252                         }
1253                 }
1254
1255                 return false;
1256         }
1257
1258         /**
1259          * Helper function that checks whether the filename looks like a thumbnail
1260          */
1261         public static function isThumbName( $filename ) {
1262                 $n = strrpos( $filename, '.' );
1263                 $partname = $n ? substr( $filename, 0, $n ) : $filename;
1264                 return (
1265                                         substr( $partname , 3, 3 ) == 'px-' ||
1266                                         substr( $partname , 2, 3 ) == 'px-'
1267                                 ) &&
1268                                 preg_match( "/[0-9]{2}/" , substr( $partname , 0, 2 ) );
1269         }
1270
1271         /**
1272          * Get a list of blacklisted filename prefixes from [[MediaWiki:Filename-prefix-blacklist]]
1273          *
1274          * @return array list of prefixes
1275          */
1276         public static function getFilenamePrefixBlacklist() {
1277                 $blacklist = array();
1278                 $message = wfMessage( 'filename-prefix-blacklist' )->inContentLanguage();
1279                 if( !$message->isDisabled() ) {
1280                         $lines = explode( "\n", $message->plain() );
1281                         foreach( $lines as $line ) {
1282                                 // Remove comment lines
1283                                 $comment = substr( trim( $line ), 0, 1 );
1284                                 if ( $comment == '#' || $comment == '' ) {
1285                                         continue;
1286                                 }
1287                                 // Remove additional comments after a prefix
1288                                 $comment = strpos( $line, '#' );
1289                                 if ( $comment > 0 ) {
1290                                         $line = substr( $line, 0, $comment-1 );
1291                                 }
1292                                 $blacklist[] = trim( $line );
1293                         }
1294                 }
1295                 return $blacklist;
1296         }
1297
1298         /**
1299          * Gets image info about the file just uploaded.
1300          *
1301          * Also has the effect of setting metadata to be an 'indexed tag name' in returned API result if
1302          * 'metadata' was requested. Oddly, we have to pass the "result" object down just so it can do that
1303          * with the appropriate format, presumably.
1304          *
1305          * @param $result ApiResult:
1306          * @return Array: image info
1307          */
1308         public function getImageInfo( $result ) {
1309                 $file = $this->getLocalFile();
1310                 // TODO This cries out for refactoring. We really want to say $file->getAllInfo(); here.
1311                 // Perhaps "info" methods should be moved into files, and the API should just wrap them in queries.
1312                 if ( $file instanceof UploadStashFile ) {
1313                         $imParam = ApiQueryStashImageInfo::getPropertyNames();
1314                         $info = ApiQueryStashImageInfo::getInfo( $file, array_flip( $imParam ), $result );
1315                 } else {
1316                         $imParam = ApiQueryImageInfo::getPropertyNames();
1317                         $info = ApiQueryImageInfo::getInfo( $file, array_flip( $imParam ), $result );
1318                 }
1319                 return $info;
1320         }
1321
1322
1323         public function convertVerifyErrorToStatus( $error ) {
1324                 $code = $error['status'];
1325                 unset( $code['status'] );
1326                 return Status::newFatal( $this->getVerificationErrorCode( $code ), $error );
1327         }
1328
1329         public static function getMaxUploadSize( $forType = null ) {
1330                 global $wgMaxUploadSize;
1331
1332                 if ( is_array( $wgMaxUploadSize ) ) {
1333                         if ( !is_null( $forType ) && isset( $wgMaxUploadSize[$forType] ) ) {
1334                                 return $wgMaxUploadSize[$forType];
1335                         } else {
1336                                 return $wgMaxUploadSize['*'];
1337                         }
1338                 } else {
1339                         return intval( $wgMaxUploadSize );
1340                 }
1341
1342         }
1343 }