includes/SpecialUpload.php

   1 <?php
   2 /**
   3  *
   4  * @package MediaWiki
   5  * @subpackage SpecialPage
   6  */
   7
   8
   9 /**
  10  * Entry point
  11  */
  12 function wfSpecialUpload() {
  13         global $wgRequest;
  14         $form = new UploadForm( $wgRequest );
  15         $form->execute();
  16 }
  17
  18 /**
  19  *
  20  * @package MediaWiki
  21  * @subpackage SpecialPage
  22  */
  23 class UploadForm {
  24         /**#@+
  25          * @access private
  26          */
  27         var $mUploadFile, $mUploadDescription, $mLicense ,$mIgnoreWarning, $mUploadError;
  28         var $mUploadSaveName, $mUploadTempName, $mUploadSize, $mUploadOldVersion;
  29         var $mUploadCopyStatus, $mUploadSource, $mReUpload, $mAction, $mUpload;
  30         var $mOname, $mSessionKey, $mStashed, $mDestFile, $mRemoveTempFile, $mSourceType;
  31         var $mUploadTempFileSize = 0;
  32         /**#@-*/
  33
  34         /**
  35          * Constructor : initialise object
  36          * Get data POSTed through the form and assign them to the object
  37          * @param $request Data posted.
  38          */
  39         function UploadForm( &$request ) {
  40                 global $wgAllowCopyUploads;
  41                 $this->mDestFile          = $request->getText( 'wpDestFile' );
  42
  43                 if( !$request->wasPosted() ) {
  44                         # GET requests just give the main form; no data except wpDestfile.
  45                         return;
  46                 }
  47
  48                 $this->mIgnoreWarning     = $request->getCheck( 'wpIgnoreWarning' );
  49                 $this->mReUpload          = $request->getCheck( 'wpReUpload' );
  50                 $this->mUpload            = $request->getCheck( 'wpUpload' );
  51
  52                 $this->mUploadDescription = $request->getText( 'wpUploadDescription' );
  53                 $this->mLicense           = $request->getText( 'wpLicense' );
  54                 $this->mUploadCopyStatus  = $request->getText( 'wpUploadCopyStatus' );
  55                 $this->mUploadSource      = $request->getText( 'wpUploadSource' );
  56                 $this->mWatchthis         = $request->getBool( 'wpWatchthis' );
  57                 $this->mSourceType         = $request->getText( 'wpSourceType' );
  58                 wfDebug( "UploadForm: watchthis is: '$this->mWatchthis'\n" );
  59
  60                 $this->mAction            = $request->getVal( 'action' );
  61
  62                 $this->mSessionKey        = $request->getInt( 'wpSessionKey' );
  63                 if( !empty( $this->mSessionKey ) &&
  64                         isset( $_SESSION['wsUploadData'][$this->mSessionKey] ) ) {
  65                         /**
  66                          * Confirming a temporarily stashed upload.
  67                          * We don't want path names to be forged, so we keep
  68                          * them in the session on the server and just give
  69                          * an opaque key to the user agent.
  70                          */
  71                         $data = $_SESSION['wsUploadData'][$this->mSessionKey];
  72                         $this->mUploadTempName   = $data['mUploadTempName'];
  73                         $this->mUploadSize       = $data['mUploadSize'];
  74                         $this->mOname            = $data['mOname'];
  75                         $this->mUploadError      = 0/*UPLOAD_ERR_OK*/;
  76                         $this->mStashed          = true;
  77                         $this->mRemoveTempFile   = false;
  78                 } else {
  79                         /**
  80                          *Check for a newly uploaded file.
  81                          */
  82                         if( $wgAllowCopyUploads && $this->mSourceType == 'web' ) {
  83                                 $this->initializeFromUrl( $request );
  84                         } else {
  85                                 $this->initializeFromUpload( $request );
  86                         }
  87                 }
  88         }
  89
  90         /**
  91          * Initialize the uploaded file from PHP data
  92          * @access private
  93          */
  94         function initializeFromUpload( $request ) {
  95                 $this->mUploadTempName = $request->getFileTempName( 'wpUploadFile' );
  96                 $this->mUploadSize     = $request->getFileSize( 'wpUploadFile' );
  97                 $this->mOname          = $request->getFileName( 'wpUploadFile' );
  98                 $this->mUploadError    = $request->getUploadError( 'wpUploadFile' );
  99                 $this->mSessionKey     = false;
 100                 $this->mStashed        = false;
 101                 $this->mRemoveTempFile = false; // PHP will handle this
 102         }
 103
 104         /**
 105          * Copy a web file to a temporary file
 106          * @access private
 107          */
 108         function initializeFromUrl( $request ) {
 109                 global $wgTmpDirectory;
 110                 $url = $request->getText( 'wpUploadFileURL' );
 111                 $local_file = tempnam( $wgTmpDirectory, 'WEBUPLOAD' );
 112
 113                 $this->mUploadTempName = $local_file;
 114                 $this->mUploadError    = $this->curlCopy( $url, $local_file );
 115                 $this->mUploadSize     = $this->mUploadTempFileSize;
 116                 $this->mOname          = array_pop( explode( '/', $url ) );
 117                 $this->mSessionKey     = false;
 118                 $this->mStashed        = false;
 119
 120                 // PHP won't auto-cleanup the file
 121                 $this->mRemoveTempFile = file_exists( $local_file );
 122         }
 123
 124         /**
 125          * Safe copy from URL
 126          * Returns true if there was an error, false otherwise
 127          */
 128         private function curlCopy( $url, $dest ) {
 129                 global $wgUser, $wgOut;
 130
 131                 if( !$wgUser->isAllowed( 'upload_by_url' ) ) {
 132                         $wgOut->permissionRequired( 'upload_by_url' );
 133                         return true;
 134                 }
 135
 136                 # Maybe remove some pasting blanks :-)
 137                 $url =  trim( $url );
 138                 if( stripos($url, 'http://') !== 0 && stripos($url, 'ftp://') !== 0 ) {
 139                         # Only HTTP or FTP URLs
 140                         $wgOut->errorPage( 'upload-proto-error', 'upload-proto-error-text' );
 141                         return true;
 142                 }
 143
 144                 # Open temporary file
 145                 $this->mUploadTempFile = @fopen( $this->mUploadTempName, "wb" );
 146                 if( $this->mUploadTempFile === false ) {
 147                         # Could not open temporary file to write in
 148                         $wgOut->errorPage( 'upload-file-error', 'upload-file-error-text');
 149                         return true;
 150                 }
 151
 152                 $ch = curl_init();
 153                 curl_setopt( $ch, CURLOPT_HTTP_VERSION, 1.0); # Probably not needed, but apparently can work around some bug
 154                 curl_setopt( $ch, CURLOPT_TIMEOUT, 10); # 10 seconds timeout
 155                 curl_setopt( $ch, CURLOPT_LOW_SPEED_LIMIT, 512); # 0.5KB per second minimum transfer speed
 156                 curl_setopt( $ch, CURLOPT_URL, $url);
 157                 curl_setopt( $ch, CURLOPT_WRITEFUNCTION, array( $this, 'uploadCurlCallback' ) );
 158                 curl_exec( $ch );
 159                 $error = curl_errno( $ch ) ? true : false;
 160                 $errornum =  curl_errno( $ch );
 161                 // if ( $error ) print curl_error ( $ch ) ; # Debugging output
 162                 curl_close( $ch );
 163
 164                 fclose( $this->mUploadTempFile );
 165                 unset( $this->mUploadTempFile );
 166                 if( $error ) {
 167                         unlink( $dest );
 168                         if( wfEmptyMsg( "upload-curl-error$errornum", wfMsg("upload-curl-error$errornum") ) )
 169                                 $wgOut->errorPage( 'upload-misc-error', 'upload-misc-error-text' );
 170                         else
 171                                 $wgOut->errorPage( "upload-curl-error$errornum", "upload-curl-error$errornum-text" );
 172                 }
 173
 174                 return $error;
 175         }
 176
 177         /**
 178          * Callback function for CURL-based web transfer
 179          * Write data to file unless we've passed the length limit;
 180          * if so, abort immediately.
 181          * @access private
 182          */
 183         function uploadCurlCallback( $ch, $data ) {
 184                 global $wgMaxUploadSize;
 185                 $length = strlen( $data );
 186                 $this->mUploadTempFileSize += $length;
 187                 if( $this->mUploadTempFileSize > $wgMaxUploadSize ) {
 188                         return 0;
 189                 }
 190                 fwrite( $this->mUploadTempFile, $data );
 191                 return $length;
 192         }
 193
 194         /**
 195          * Start doing stuff
 196          * @access public
 197          */
 198         function execute() {
 199                 global $wgUser, $wgOut;
 200                 global $wgEnableUploads, $wgUploadDirectory;
 201
 202                 # Check uploading enabled
 203                 if( !$wgEnableUploads ) {
 204                         $wgOut->showErrorPage( 'uploaddisabled', 'uploaddisabledtext' );
 205                         return;
 206                 }
 207
 208                 # Check permissions
 209                 if( !$wgUser->isAllowed( 'upload' ) ) {
 210                         if( !$wgUser->isLoggedIn() ) {
 211                                 $wgOut->showErrorPage( 'uploadnologin', 'uploadnologintext' );
 212                         } else {
 213                                 $wgOut->permissionRequired( 'upload' );
 214                         }
 215                         return;
 216                 }
 217
 218                 # Check blocks
 219                 if( $wgUser->isBlocked() ) {
 220                         $wgOut->blockedPage();
 221                         return;
 222                 }
 223
 224                 if( wfReadOnly() ) {
 225                         $wgOut->readOnlyPage();
 226                         return;
 227                 }
 228
 229                 /** Check if the image directory is writeable, this is a common mistake */
 230                 if( !is_writeable( $wgUploadDirectory ) ) {
 231                         $wgOut->addWikiText( wfMsg( 'upload_directory_read_only', $wgUploadDirectory ) );
 232                         return;
 233                 }
 234
 235                 if( $this->mReUpload ) {
 236                         if( !$this->unsaveUploadedFile() ) {
 237                                 return;
 238                         }
 239                         $this->mainUploadForm();
 240                 } else if( 'submit' == $this->mAction || $this->mUpload ) {
 241                         $this->processUpload();
 242                 } else {
 243                         $this->mainUploadForm();
 244                 }
 245
 246                 $this->cleanupTempFile();
 247         }
 248
 249         /* -------------------------------------------------------------- */
 250
 251         /**
 252          * Really do the upload
 253          * Checks are made in SpecialUpload::execute()
 254          * @access private
 255          */
 256         function processUpload() {
 257                 global $wgUser, $wgOut;
 258
 259                 /* Check for PHP error if any, requires php 4.2 or newer */
 260                 if( $this->mUploadError == 1/*UPLOAD_ERR_INI_SIZE*/ ) {
 261                         $this->mainUploadForm( wfMsgHtml( 'largefileserver' ) );
 262                         return;
 263                 }
 264
 265                 /**
 266                  * If there was no filename or a zero size given, give up quick.
 267                  */
 268                 if( trim( $this->mOname ) == '' || empty( $this->mUploadSize ) ) {
 269                         $this->mainUploadForm( wfMsgHtml( 'emptyfile' ) );
 270                         return;
 271                 }
 272
 273                 # Chop off any directories in the given filename
 274                 if( $this->mDestFile ) {
 275                         $basename = wfBaseName( $this->mDestFile );
 276                 } else {
 277                         $basename = wfBaseName( $this->mOname );
 278                 }
 279
 280                 /**
 281                  * We'll want to blacklist against *any* 'extension', and use
 282                  * only the final one for the whitelist.
 283                  */
 284                 list( $partname, $ext ) = $this->splitExtensions( $basename );
 285
 286                 if( count( $ext ) ) {
 287                         $finalExt = $ext[count( $ext ) - 1];
 288                 } else {
 289                         $finalExt = '';
 290                 }
 291                 $fullExt = implode( '.', $ext );
 292
 293                 # If there was more than one "extension", reassemble the base
 294                 # filename to prevent bogus complaints about length
 295                 if( count( $ext ) > 1 ) {
 296                         for( $i = 0; $i < count( $ext ) - 1; $i++ )
 297                                 $partname .= '.' . $ext[$i];
 298                 }
 299
 300                 if( strlen( $partname ) < 3 ) {
 301                         $this->mainUploadForm( wfMsgHtml( 'minlength' ) );
 302                         return;
 303                 }
 304
 305                 /**
 306                  * Filter out illegal characters, and try to make a legible name
 307                  * out of it. We'll strip some silently that Title would die on.
 308                  */
 309                 $filtered = preg_replace ( "/[^".Title::legalChars()."]|:/", '-', $basename );
 310                 $nt = Title::newFromText( $filtered );
 311                 if( is_null( $nt ) ) {
 312                         $this->uploadError( wfMsgWikiHtml( 'illegalfilename', htmlspecialchars( $filtered ) ) );
 313                         return;
 314                 }
 315                 $nt =& Title::makeTitle( NS_IMAGE, $nt->getDBkey() );
 316                 $this->mUploadSaveName = $nt->getDBkey();
 317
 318                 /**
 319                  * If the image is protected, non-sysop users won't be able
 320                  * to modify it by uploading a new revision.
 321                  */
 322                 if( !$nt->userCanEdit() ) {
 323                         return $this->uploadError( wfMsgWikiHtml( 'protectedpage' ) );
 324                 }
 325
 326                 /**
 327                  * In some cases we may forbid overwriting of existing files.
 328                  */
 329                 $overwrite = $this->checkOverwrite( $this->mUploadSaveName );
 330                 if( WikiError::isError( $overwrite ) ) {
 331                         return $this->uploadError( $overwrite->toString() );
 332                 }
 333
 334                 /* Don't allow users to override the blacklist (check file extension) */
 335                 global $wgStrictFileExtensions;
 336                 global $wgFileExtensions, $wgFileBlacklist;
 337                 if( $this->checkFileExtensionList( $ext, $wgFileBlacklist ) ||
 338                         ($wgStrictFileExtensions &&
 339                                 !$this->checkFileExtension( $finalExt, $wgFileExtensions ) ) ) {
 340                         return $this->uploadError( wfMsgHtml( 'badfiletype', htmlspecialchars( $fullExt ) ) );
 341                 }
 342
 343                 /**
 344                  * Look at the contents of the file; if we can recognize the
 345                  * type but it's corrupt or data of the wrong type, we should
 346                  * probably not accept it.
 347                  */
 348                 if( !$this->mStashed ) {
 349                         $this->checkMacBinary();
 350                         $veri = $this->verify( $this->mUploadTempName, $finalExt );
 351
 352                         if( $veri !== true ) { //it's a wiki error...
 353                                 return $this->uploadError( $veri->toString() );
 354                         }
 355                 }
 356
 357                 /**
 358                  * Provide an opportunity for extensions to add futher checks
 359                  */
 360                 $error = '';
 361                 if( !wfRunHooks( 'UploadVerification',
 362                                 array( $this->mUploadSaveName, $this->mUploadTempName, &$error ) ) ) {
 363                         return $this->uploadError( $error );
 364                 }
 365
 366                 /**
 367                  * Check for non-fatal conditions
 368                  */
 369                 if ( ! $this->mIgnoreWarning ) {
 370                         $warning = '';
 371
 372                         global $wgCapitalLinks;
 373                         if( $wgCapitalLinks ) {
 374                                 $filtered = ucfirst( $filtered );
 375                         }
 376                         if( $this->mUploadSaveName != $filtered ) {
 377                                 $warning .=  '<li>'.wfMsgHtml( 'badfilename', htmlspecialchars( $this->mUploadSaveName ) ).'</li>';
 378                         }
 379
 380                         global $wgCheckFileExtensions;
 381                         if ( $wgCheckFileExtensions ) {
 382                                 if ( ! $this->checkFileExtension( $finalExt, $wgFileExtensions ) ) {
 383                                         $warning .= '<li>'.wfMsgHtml( 'badfiletype', htmlspecialchars( $fullExt ) ).'</li>';
 384                                 }
 385                         }
 386
 387                         global $wgUploadSizeWarning;
 388                         if ( $wgUploadSizeWarning && ( $this->mUploadSize > $wgUploadSizeWarning ) ) {
 389                                 # TODO: Format $wgUploadSizeWarning to something that looks better than the raw byte
 390                                 # value, perhaps add GB,MB and KB suffixes?
 391                                 $warning .= '<li>'.wfMsgHtml( 'largefile', $wgUploadSizeWarning, $this->mUploadSize ).'</li>';
 392                         }
 393                         if ( $this->mUploadSize == 0 ) {
 394                                 $warning .= '<li>'.wfMsgHtml( 'emptyfile' ).'</li>';
 395                         }
 396
 397                         if( $nt->getArticleID() ) {
 398                                 global $wgUser;
 399                                 $sk = $wgUser->getSkin();
 400                                 $dlink = $sk->makeKnownLinkObj( $nt );
 401                                 $warning .= '<li>'.wfMsgHtml( 'fileexists', $dlink ).'</li>';
 402                         } else {
 403                                 # If the file existed before and was deleted, warn the user of this
 404                                 # Don't bother doing so if the image exists now, however
 405                                 $image = new Image( $nt );
 406                                 if( $image->wasDeleted() ) {
 407                                         $skin = $wgUser->getSkin();
 408                                         $ltitle = SpecialPage::getTitleFor( 'Log' );
 409                                         $llink = $skin->makeKnownLinkObj( $ltitle, wfMsgHtml( 'deletionlog' ), 'type=delete&page=' . $nt->getPrefixedUrl() );
 410                                         $warning .= wfOpenElement( 'li' ) . wfMsgWikiHtml( 'filewasdeleted', $llink ) . wfCloseElement( 'li' );
 411                                 }
 412                         }
 413
 414                         if( $warning != '' ) {
 415                                 /**
 416                                  * Stash the file in a temporary location; the user can choose
 417                                  * to let it through and we'll complete the upload then.
 418                                  */
 419                                 return $this->uploadWarning( $warning );
 420                         }
 421                 }
 422
 423                 /**
 424                  * Try actually saving the thing...
 425                  * It will show an error form on failure.
 426                  */
 427                 $hasBeenMunged = !empty( $this->mSessionKey ) || $this->mRemoveTempFile;
 428                 if( $this->saveUploadedFile( $this->mUploadSaveName,
 429                                              $this->mUploadTempName,
 430                                              $hasBeenMunged ) ) {
 431                         /**
 432                          * Update the upload log and create the description page
 433                          * if it's a new file.
 434                          */
 435                         $img = Image::newFromName( $this->mUploadSaveName );
 436                         $success = $img->recordUpload( $this->mUploadOldVersion,
 437                                                         $this->mUploadDescription,
 438                                                         $this->mLicense,
 439                                                         $this->mUploadCopyStatus,
 440                                                         $this->mUploadSource,
 441                                                         $this->mWatchthis );
 442
 443                         if ( $success ) {
 444                                 $this->showSuccess();
 445                                 wfRunHooks( 'UploadComplete', array( &$img ) );
 446                         } else {
 447                                 // Image::recordUpload() fails if the image went missing, which is
 448                                 // unlikely, hence the lack of a specialised message
 449                                 $wgOut->showFileNotFoundError( $this->mUploadSaveName );
 450                         }
 451                 }
 452         }
 453
 454         /**
 455          * Move the uploaded file from its temporary location to the final
 456          * destination. If a previous version of the file exists, move
 457          * it into the archive subdirectory.
 458          *
 459          * @todo If the later save fails, we may have disappeared the original file.
 460          *
 461          * @param string $saveName
 462          * @param string $tempName full path to the temporary file
 463          * @param bool $useRename if true, doesn't check that the source file
 464          *                        is a PHP-managed upload temporary
 465          */
 466         function saveUploadedFile( $saveName, $tempName, $useRename = false ) {
 467                 global $wgOut, $wgAllowCopyUploads;
 468
 469                 if ( !$useRename AND $wgAllowCopyUploads AND $this->mSourceType == 'web' ) $useRename = true;
 470
 471                 $fname= "SpecialUpload::saveUploadedFile";
 472
 473                 $dest = wfImageDir( $saveName );
 474                 $archive = wfImageArchiveDir( $saveName );
 475                 if ( !is_dir( $dest ) ) wfMkdirParents( $dest );
 476                 if ( !is_dir( $archive ) ) wfMkdirParents( $archive );
 477
 478                 $this->mSavedFile = "{$dest}/{$saveName}";
 479
 480                 if( is_file( $this->mSavedFile ) ) {
 481                         $this->mUploadOldVersion = gmdate( 'YmdHis' ) . "!{$saveName}";
 482                         wfSuppressWarnings();
 483                         $success = rename( $this->mSavedFile, "${archive}/{$this->mUploadOldVersion}" );
 484                         wfRestoreWarnings();
 485
 486                         if( ! $success ) {
 487                                 $wgOut->showFileRenameError( $this->mSavedFile,
 488                                   "${archive}/{$this->mUploadOldVersion}" );
 489                                 return false;
 490                         }
 491                         else wfDebug("$fname: moved file ".$this->mSavedFile." to ${archive}/{$this->mUploadOldVersion}\n");
 492                 }
 493                 else {
 494                         $this->mUploadOldVersion = '';
 495                 }
 496
 497                 wfSuppressWarnings();
 498                 $success = $useRename
 499                         ? rename( $tempName, $this->mSavedFile )
 500                         : move_uploaded_file( $tempName, $this->mSavedFile );
 501                 wfRestoreWarnings();
 502
 503                 if( ! $success ) {
 504                         $wgOut->showFileCopyError( $tempName, $this->mSavedFile );
 505                         return false;
 506                 } else {
 507                         wfDebug("$fname: wrote tempfile $tempName to ".$this->mSavedFile."\n");
 508                 }
 509
 510                 chmod( $this->mSavedFile, 0644 );
 511                 return true;
 512         }
 513
 514         /**
 515          * Stash a file in a temporary directory for later processing
 516          * after the user has confirmed it.
 517          *
 518          * If the user doesn't explicitly cancel or accept, these files
 519          * can accumulate in the temp directory.
 520          *
 521          * @param string $saveName - the destination filename
 522          * @param string $tempName - the source temporary file to save
 523          * @return string - full path the stashed file, or false on failure
 524          * @access private
 525          */
 526         function saveTempUploadedFile( $saveName, $tempName ) {
 527                 global $wgOut;
 528                 $archive = wfImageArchiveDir( $saveName, 'temp' );
 529                 if ( !is_dir ( $archive ) ) wfMkdirParents( $archive );
 530                 $stash = $archive . '/' . gmdate( "YmdHis" ) . '!' . $saveName;
 531
 532                 $success = $this->mRemoveTempFile
 533                         ? rename( $tempName, $stash )
 534                         : move_uploaded_file( $tempName, $stash );
 535                 if ( !$success ) {
 536                         $wgOut->showFileCopyError( $tempName, $stash );
 537                         return false;
 538                 }
 539
 540                 return $stash;
 541         }
 542
 543         /**
 544          * Stash a file in a temporary directory for later processing,
 545          * and save the necessary descriptive info into the session.
 546          * Returns a key value which will be passed through a form
 547          * to pick up the path info on a later invocation.
 548          *
 549          * @return int
 550          * @access private
 551          */
 552         function stashSession() {
 553                 $stash = $this->saveTempUploadedFile(
 554                         $this->mUploadSaveName, $this->mUploadTempName );
 555
 556                 if( !$stash ) {
 557                         # Couldn't save the file.
 558                         return false;
 559                 }
 560
 561                 $key = mt_rand( 0, 0x7fffffff );
 562                 $_SESSION['wsUploadData'][$key] = array(
 563                         'mUploadTempName' => $stash,
 564                         'mUploadSize'     => $this->mUploadSize,
 565                         'mOname'          => $this->mOname );
 566                 return $key;
 567         }
 568
 569         /**
 570          * Remove a temporarily kept file stashed by saveTempUploadedFile().
 571          * @access private
 572          * @return success
 573          */
 574         function unsaveUploadedFile() {
 575                 global $wgOut;
 576                 wfSuppressWarnings();
 577                 $success = unlink( $this->mUploadTempName );
 578                 wfRestoreWarnings();
 579                 if ( ! $success ) {
 580                         $wgOut->showFileDeleteError( $this->mUploadTempName );
 581                         return false;
 582                 } else {
 583                         return true;
 584                 }
 585         }
 586
 587         /* -------------------------------------------------------------- */
 588
 589         /**
 590          * Show some text and linkage on successful upload.
 591          * @access private
 592          */
 593         function showSuccess() {
 594                 global $wgUser, $wgOut, $wgContLang;
 595
 596                 $sk = $wgUser->getSkin();
 597                 $ilink = $sk->makeMediaLink( $this->mUploadSaveName, Image::imageUrl( $this->mUploadSaveName ) );
 598                 $dname = $wgContLang->getNsText( NS_IMAGE ) . ':'.$this->mUploadSaveName;
 599                 $dlink = $sk->makeKnownLink( $dname, $dname );
 600
 601                 $wgOut->addHTML( '<h2>' . wfMsgHtml( 'successfulupload' ) . "</h2>\n" );
 602                 $text = wfMsgWikiHtml( 'fileuploaded', $ilink, $dlink );
 603                 $wgOut->addHTML( $text );
 604                 $wgOut->returnToMain( false );
 605         }
 606
 607         /**
 608          * @param string $error as HTML
 609          * @access private
 610          */
 611         function uploadError( $error ) {
 612                 global $wgOut;
 613                 $wgOut->addHTML( "<h2>" . wfMsgHtml( 'uploadwarning' ) . "</h2>\n" );
 614                 $wgOut->addHTML( "<span class='error'>{$error}</span>\n" );
 615         }
 616
 617         /**
 618          * There's something wrong with this file, not enough to reject it
 619          * totally but we require manual intervention to save it for real.
 620          * Stash it away, then present a form asking to confirm or cancel.
 621          *
 622          * @param string $warning as HTML
 623          * @access private
 624          */
 625         function uploadWarning( $warning ) {
 626                 global $wgOut;
 627                 global $wgUseCopyrightUpload;
 628
 629                 $this->mSessionKey = $this->stashSession();
 630                 if( !$this->mSessionKey ) {
 631                         # Couldn't save file; an error has been displayed so let's go.
 632                         return;
 633                 }
 634
 635                 $wgOut->addHTML( "<h2>" . wfMsgHtml( 'uploadwarning' ) . "</h2>\n" );
 636                 $wgOut->addHTML( "<ul class='warning'>{$warning}</ul><br />\n" );
 637
 638                 $save = wfMsgHtml( 'savefile' );
 639                 $reupload = wfMsgHtml( 'reupload' );
 640                 $iw = wfMsgWikiHtml( 'ignorewarning' );
 641                 $reup = wfMsgWikiHtml( 'reuploaddesc' );
 642                 $titleObj = SpecialPage::getTitleFor( 'Upload' );
 643                 $action = $titleObj->escapeLocalURL( 'action=submit' );
 644
 645                 if ( $wgUseCopyrightUpload )
 646                 {
 647                         $copyright =  "
 648         <input type='hidden' name='wpUploadCopyStatus' value=\"" . htmlspecialchars( $this->mUploadCopyStatus ) . "\" />
 649         <input type='hidden' name='wpUploadSource' value=\"" . htmlspecialchars( $this->mUploadSource ) . "\" />
 650         ";
 651                 } else {
 652                         $copyright = "";
 653                 }
 654
 655                 $wgOut->addHTML( "
 656         <form id='uploadwarning' method='post' enctype='multipart/form-data' action='$action'>
 657                 <input type='hidden' name='wpIgnoreWarning' value='1' />
 658                 <input type='hidden' name='wpSessionKey' value=\"" . htmlspecialchars( $this->mSessionKey ) . "\" />
 659                 <input type='hidden' name='wpUploadDescription' value=\"" . htmlspecialchars( $this->mUploadDescription ) . "\" />
 660                 <input type='hidden' name='wpLicense' value=\"" . htmlspecialchars( $this->mLicense ) . "\" />
 661                 <input type='hidden' name='wpDestFile' value=\"" . htmlspecialchars( $this->mDestFile ) . "\" />
 662                 <input type='hidden' name='wpWatchthis' value=\"" . htmlspecialchars( intval( $this->mWatchthis ) ) . "\" />
 663         {$copyright}
 664         <table border='0'>
 665                 <tr>
 666                         <tr>
 667                                 <td align='right'>
 668                                         <input tabindex='2' type='submit' name='wpUpload' value=\"$save\" />
 669                                 </td>
 670                                 <td align='left'>$iw</td>
 671                         </tr>
 672                         <tr>
 673                                 <td align='right'>
 674                                         <input tabindex='2' type='submit' name='wpReUpload' value=\"{$reupload}\" />
 675                                 </td>
 676                                 <td align='left'>$reup</td>
 677                         </tr>
 678                 </tr>
 679         </table></form>\n" );
 680         }
 681
 682         /**
 683          * Displays the main upload form, optionally with a highlighted
 684          * error message up at the top.
 685          *
 686          * @param string $msg as HTML
 687          * @access private
 688          */
 689         function mainUploadForm( $msg='' ) {
 690                 global $wgOut, $wgUser;
 691                 global $wgUseCopyrightUpload;
 692                 global $wgRequest, $wgAllowCopyUploads;
 693
 694                 $cols = intval($wgUser->getOption( 'cols' ));
 695                 $ew = $wgUser->getOption( 'editwidth' );
 696                 if ( $ew ) $ew = " style=\"width:100%\"";
 697                 else $ew = '';
 698
 699                 if ( '' != $msg ) {
 700                         $sub = wfMsgHtml( 'uploaderror' );
 701                         $wgOut->addHTML( "<h2>{$sub}</h2>\n" .
 702                           "<span class='error'>{$msg}</span>\n" );
 703                 }
 704                 $wgOut->addHTML( '<div id="uploadtext">' );
 705                 $wgOut->addWikiText( wfMsg( 'uploadtext' ) );
 706                 $wgOut->addHTML( '</div>' );
 707
 708                 $sourcefilename = wfMsgHtml( 'sourcefilename' );
 709                 $destfilename = wfMsgHtml( 'destfilename' );
 710                 $summary = wfMsgWikiHtml( 'fileuploadsummary' );
 711
 712                 $licenses = new Licenses();
 713                 $license = wfMsgHtml( 'license' );
 714                 $nolicense = wfMsgHtml( 'nolicense' );
 715                 $licenseshtml = $licenses->getHtml();
 716
 717                 $ulb = wfMsgHtml( 'uploadbtn' );
 718
 719
 720                 $titleObj = SpecialPage::getTitleFor( 'Upload' );
 721                 $action = $titleObj->escapeLocalURL();
 722
 723                 $encDestFile = htmlspecialchars( $this->mDestFile );
 724
 725                 $watchChecked =
 726                         ( $wgUser->getOption( 'watchdefault' ) ||
 727                                 ( $wgUser->getOption( 'watchcreations' ) && $this->mDestFile == '' ) )
 728                         ? 'checked="checked"'
 729                         : '';
 730
 731                 // Prepare form for upload or upload/copy
 732                 if( $wgAllowCopyUploads && $wgUser->isAllowed( 'upload_by_url' ) ) {
 733                         $filename_form =
 734                                 "<input type='radio' id='wpSourceTypeFile' name='wpSourceType' value='file' onchange='toggle_element_activation(\"wpUploadFileURL\",\"wpUploadFile\")' checked />" .
 735                                 "<input tabindex='1' type='file' name='wpUploadFile' id='wpUploadFile' onfocus='toggle_element_activation(\"wpUploadFileURL\",\"wpUploadFile\");toggle_element_check(\"wpSourceTypeFile\",\"wpSourceTypeURL\")'" .
 736                                 ($this->mDestFile?"":"onchange='fillDestFilename(\"wpUploadFile\")' ") . "size='40' />" .
 737                                 wfMsgHTML( 'upload_source_file' ) . "<br/>" .
 738                                 "<input type='radio' id='wpSourceTypeURL' name='wpSourceType' value='web' onchange='toggle_element_activation(\"wpUploadFile\",\"wpUploadFileURL\")' />" .
 739                                 "<input tabindex='1' type='text' name='wpUploadFileURL' id='wpUploadFileURL' onfocus='toggle_element_activation(\"wpUploadFile\",\"wpUploadFileURL\");toggle_element_check(\"wpSourceTypeURL\",\"wpSourceTypeFile\")'" .
 740                                 ($this->mDestFile?"":"onchange='fillDestFilename(\"wpUploadFileURL\")' ") . "size='40' DISABLED />" .
 741                                 wfMsgHtml( 'upload_source_url' ) ;
 742                 } else {
 743                         $filename_form =
 744                                 "<input tabindex='1' type='file' name='wpUploadFile' id='wpUploadFile' " .
 745                                 ($this->mDestFile?"":"onchange='fillDestFilename(\"wpUploadFile\")' ") .
 746                                 "size='40' />" .
 747                                 "<input type='hidden' name='wpSourceType' value='file' />" ;
 748                 }
 749
 750                 $wgOut->addHTML( "
 751         <form id='upload' method='post' enctype='multipart/form-data' action=\"$action\">
 752                 <table border='0'>
 753                 <tr>
 754                         <td align='right' valign='top'><label for='wpUploadFile'>{$sourcefilename}:</label></td>
 755                         <td align='left'>
 756                                 {$filename_form}
 757                         </td>
 758                 </tr>
 759                 <tr>
 760                         <td align='right'><label for='wpDestFile'>{$destfilename}:</label></td>
 761                         <td align='left'>
 762                                 <input tabindex='2' type='text' name='wpDestFile' id='wpDestFile' size='40' value=\"$encDestFile\" />
 763                         </td>
 764                 </tr>
 765                 <tr>
 766                         <td align='right'><label for='wpUploadDescription'>{$summary}</label></td>
 767                         <td align='left'>
 768                                 <textarea tabindex='3' name='wpUploadDescription' id='wpUploadDescription' rows='6' cols='{$cols}'{$ew}>" . htmlspecialchars( $this->mUploadDescription ) . "</textarea>
 769                         </td>
 770                 </tr>
 771                 <tr>" );
 772
 773                 if ( $licenseshtml != '' ) {
 774                         global $wgStylePath;
 775                         $wgOut->addHTML( "
 776                         <td align='right'><label for='wpLicense'>$license:</label></td>
 777                         <td align='left'>
 778                                 <script type='text/javascript' src=\"$wgStylePath/common/upload.js\"></script>
 779                                 <select name='wpLicense' id='wpLicense' tabindex='4'
 780                                         onchange='licenseSelectorCheck()'>
 781                                         <option value=''>$nolicense</option>
 782                                         $licenseshtml
 783                                 </select>
 784                         </td>
 785                         </tr>
 786                         <tr>
 787                 ");
 788                 }
 789
 790                 if ( $wgUseCopyrightUpload ) {
 791                         $filestatus = wfMsgHtml ( 'filestatus' );
 792                         $copystatus =  htmlspecialchars( $this->mUploadCopyStatus );
 793                         $filesource = wfMsgHtml ( 'filesource' );
 794                         $uploadsource = htmlspecialchars( $this->mUploadSource );
 795
 796                         $wgOut->addHTML( "
 797                                 <td align='right' nowrap='nowrap'><label for='wpUploadCopyStatus'>$filestatus:</label></td>
 798                                 <td><input tabindex='5' type='text' name='wpUploadCopyStatus' id='wpUploadCopyStatus' value=\"$copystatus\" size='40' /></td>
 799                         </tr>
 800                         <tr>
 801                                 <td align='right'><label for='wpUploadCopyStatus'>$filesource:</label></td>
 802                                 <td><input tabindex='6' type='text' name='wpUploadSource' id='wpUploadCopyStatus' value=\"$uploadsource\" size='40' /></td>
 803                         </tr>
 804                         <tr>
 805                 ");
 806                 }
 807
 808
 809                 $wgOut->addHtml( "
 810                 <td></td>
 811                 <td>
 812                         <input tabindex='7' type='checkbox' name='wpWatchthis' id='wpWatchthis' $watchChecked value='true' />
 813                         <label for='wpWatchthis'>" . wfMsgHtml( 'watchthisupload' ) . "</label>
 814                         <input tabindex='8' type='checkbox' name='wpIgnoreWarning' id='wpIgnoreWarning' value='true' />
 815                         <label for='wpIgnoreWarning'>" . wfMsgHtml( 'ignorewarnings' ) . "</label>
 816                 </td>
 817         </tr>
 818         <tr>
 819
 820         </tr>
 821         <tr>
 822                 <td></td>
 823                 <td align='left'><input tabindex='9' type='submit' name='wpUpload' value=\"{$ulb}\" /></td>
 824         </tr>
 825
 826         <tr>
 827                 <td></td>
 828                 <td align='left'>
 829                 " );
 830                 $wgOut->addWikiText( wfMsgForContent( 'edittools' ) );
 831                 $wgOut->addHTML( "
 832                 </td>
 833         </tr>
 834
 835         </table>
 836         </form>" );
 837         }
 838
 839         /* -------------------------------------------------------------- */
 840
 841         /**
 842          * Split a file into a base name and all dot-delimited 'extensions'
 843          * on the end. Some web server configurations will fall back to
 844          * earlier pseudo-'extensions' to determine type and execute
 845          * scripts, so the blacklist needs to check them all.
 846          *
 847          * @return array
 848          */
 849         function splitExtensions( $filename ) {
 850                 $bits = explode( '.', $filename );
 851                 $basename = array_shift( $bits );
 852                 return array( $basename, $bits );
 853         }
 854
 855         /**
 856          * Perform case-insensitive match against a list of file extensions.
 857          * Returns true if the extension is in the list.
 858          *
 859          * @param string $ext
 860          * @param array $list
 861          * @return bool
 862          */
 863         function checkFileExtension( $ext, $list ) {
 864                 return in_array( strtolower( $ext ), $list );
 865         }
 866
 867         /**
 868          * Perform case-insensitive match against a list of file extensions.
 869          * Returns true if any of the extensions are in the list.
 870          *
 871          * @param array $ext
 872          * @param array $list
 873          * @return bool
 874          */
 875         function checkFileExtensionList( $ext, $list ) {
 876                 foreach( $ext as $e ) {
 877                         if( in_array( strtolower( $e ), $list ) ) {
 878                                 return true;
 879                         }
 880                 }
 881                 return false;
 882         }
 883
 884         /**
 885          * Verifies that it's ok to include the uploaded file
 886          *
 887          * @param string $tmpfile the full path of the temporary file to verify
 888          * @param string $extension The filename extension that the file is to be served with
 889          * @return mixed true of the file is verified, a WikiError object otherwise.
 890          */
 891         function verify( $tmpfile, $extension ) {
 892                 #magically determine mime type
 893                 $magic=& MimeMagic::singleton();
 894                 $mime= $magic->guessMimeType($tmpfile,false);
 895
 896                 $fname= "SpecialUpload::verify";
 897
 898                 #check mime type, if desired
 899                 global $wgVerifyMimeType;
 900                 if ($wgVerifyMimeType) {
 901
 902                         #check mime type against file extension
 903                         if( !$this->verifyExtension( $mime, $extension ) ) {
 904                                 return new WikiErrorMsg( 'uploadcorrupt' );
 905                         }
 906
 907                         #check mime type blacklist
 908                         global $wgMimeTypeBlacklist;
 909                         if( isset($wgMimeTypeBlacklist) && !is_null($wgMimeTypeBlacklist)
 910                                 && $this->checkFileExtension( $mime, $wgMimeTypeBlacklist ) ) {
 911                                 return new WikiErrorMsg( 'badfiletype', htmlspecialchars( $mime ) );
 912                         }
 913                 }
 914
 915                 #check for htmlish code and javascript
 916                 if( $this->detectScript ( $tmpfile, $mime, $extension ) ) {
 917                         return new WikiErrorMsg( 'uploadscripted' );
 918                 }
 919
 920                 /**
 921                 * Scan the uploaded file for viruses
 922                 */
 923                 $virus= $this->detectVirus($tmpfile);
 924                 if ( $virus ) {
 925                         return new WikiErrorMsg( 'uploadvirus', htmlspecialchars($virus) );
 926                 }
 927
 928                 wfDebug( "$fname: all clear; passing.\n" );
 929                 return true;
 930         }
 931
 932         /**
 933          * Checks if the mime type of the uploaded file matches the file extension.
 934          *
 935          * @param string $mime the mime type of the uploaded file
 936          * @param string $extension The filename extension that the file is to be served with
 937          * @return bool
 938          */
 939         function verifyExtension( $mime, $extension ) {
 940                 $fname = 'SpecialUpload::verifyExtension';
 941
 942                 $magic =& MimeMagic::singleton();
 943
 944                 if ( ! $mime || $mime == 'unknown' || $mime == 'unknown/unknown' )
 945                         if ( ! $magic->isRecognizableExtension( $extension ) ) {
 946                                 wfDebug( "$fname: passing file with unknown detected mime type; unrecognized extension '$extension', can't verify\n" );
 947                                 return true;
 948                         } else {
 949                                 wfDebug( "$fname: rejecting file with unknown detected mime type; recognized extension '$extension', so probably invalid file\n" );
 950                                 return false;
 951                         }
 952
 953                 $match= $magic->isMatchingExtension($extension,$mime);
 954
 955                 if ($match===NULL) {
 956                         wfDebug( "$fname: no file extension known for mime type $mime, passing file\n" );
 957                         return true;
 958                 } elseif ($match===true) {
 959                         wfDebug( "$fname: mime type $mime matches extension $extension, passing file\n" );
 960
 961                         #TODO: if it's a bitmap, make sure PHP or ImageMagic resp. can handle it!
 962                         return true;
 963
 964                 } else {
 965                         wfDebug( "$fname: mime type $mime mismatches file extension $extension, rejecting file\n" );
 966                         return false;
 967                 }
 968         }
 969
 970         /** Heuristig for detecting files that *could* contain JavaScript instructions or
 971         * things that may look like HTML to a browser and are thus
 972         * potentially harmful. The present implementation will produce false positives in some situations.
 973         *
 974         * @param string $file Pathname to the temporary upload file
 975         * @param string $mime The mime type of the file
 976         * @param string $extension The extension of the file
 977         * @return bool true if the file contains something looking like embedded scripts
 978         */
 979         function detectScript($file, $mime, $extension) {
 980                 global $wgAllowTitlesInSVG;
 981
 982                 #ugly hack: for text files, always look at the entire file.
 983                 #For binarie field, just check the first K.
 984
 985                 if (strpos($mime,'text/')===0) $chunk = file_get_contents( $file );
 986                 else {
 987                         $fp = fopen( $file, 'rb' );
 988                         $chunk = fread( $fp, 1024 );
 989                         fclose( $fp );
 990                 }
 991
 992                 $chunk= strtolower( $chunk );
 993
 994                 if (!$chunk) return false;
 995
 996                 #decode from UTF-16 if needed (could be used for obfuscation).
 997                 if (substr($chunk,0,2)=="\xfe\xff") $enc= "UTF-16BE";
 998                 elseif (substr($chunk,0,2)=="\xff\xfe") $enc= "UTF-16LE";
 999                 else $enc= NULL;
1000
1001                 if ($enc) $chunk= iconv($enc,"ASCII//IGNORE",$chunk);
1002
1003                 $chunk= trim($chunk);
1004
1005                 #FIXME: convert from UTF-16 if necessarry!
1006
1007                 wfDebug("SpecialUpload::detectScript: checking for embedded scripts and HTML stuff\n");
1008
1009                 #check for HTML doctype
1010                 if (eregi("<!DOCTYPE *X?HTML",$chunk)) return true;
1011
1012                 /**
1013                 * Internet Explorer for Windows performs some really stupid file type
1014                 * autodetection which can cause it to interpret valid image files as HTML
1015                 * and potentially execute JavaScript, creating a cross-site scripting
1016                 * attack vectors.
1017                 *
1018                 * Apple's Safari browser also performs some unsafe file type autodetection
1019                 * which can cause legitimate files to be interpreted as HTML if the
1020                 * web server is not correctly configured to send the right content-type
1021                 * (or if you're really uploading plain text and octet streams!)
1022                 *
1023                 * Returns true if IE is likely to mistake the given file for HTML.
1024                 * Also returns true if Safari would mistake the given file for HTML
1025                 * when served with a generic content-type.
1026                 */
1027
1028                 $tags = array(
1029                         '<body',
1030                         '<head',
1031                         '<html',   #also in safari
1032                         '<img',
1033                         '<pre',
1034                         '<script', #also in safari
1035                         '<table'
1036                         );
1037                 if( ! $wgAllowTitlesInSVG && $extension !== 'svg' && $mime !== 'image/svg' ) {
1038                         $tags[] = '<title';
1039                 }
1040
1041                 foreach( $tags as $tag ) {
1042                         if( false !== strpos( $chunk, $tag ) ) {
1043                                 return true;
1044                         }
1045                 }
1046
1047                 /*
1048                 * look for javascript
1049                 */
1050
1051                 #resolve entity-refs to look at attributes. may be harsh on big files... cache result?
1052                 $chunk = Sanitizer::decodeCharReferences( $chunk );
1053
1054                 #look for script-types
1055                 if (preg_match('!type\s*=\s*[\'"]?\s*(\w*/)?(ecma|java)!sim',$chunk)) return true;
1056
1057                 #look for html-style script-urls
1058                 if (preg_match('!(href|src|data)\s*=\s*[\'"]?\s*(ecma|java)script:!sim',$chunk)) return true;
1059
1060                 #look for css-style script-urls
1061                 if (preg_match('!url\s*\(\s*[\'"]?\s*(ecma|java)script:!sim',$chunk)) return true;
1062
1063                 wfDebug("SpecialUpload::detectScript: no scripts found\n");
1064                 return false;
1065         }
1066
1067         /** Generic wrapper function for a virus scanner program.
1068         * This relies on the $wgAntivirus and $wgAntivirusSetup variables.
1069         * $wgAntivirusRequired may be used to deny upload if the scan fails.
1070         *
1071         * @param string $file Pathname to the temporary upload file
1072         * @return mixed false if not virus is found, NULL if the scan fails or is disabled,
1073         *         or a string containing feedback from the virus scanner if a virus was found.
1074         *         If textual feedback is missing but a virus was found, this function returns true.
1075         */
1076         function detectVirus($file) {
1077                 global $wgAntivirus, $wgAntivirusSetup, $wgAntivirusRequired, $wgOut;
1078
1079                 $fname= "SpecialUpload::detectVirus";
1080
1081                 if (!$wgAntivirus) { #disabled?
1082                         wfDebug("$fname: virus scanner disabled\n");
1083
1084                         return NULL;
1085                 }
1086
1087                 if (!$wgAntivirusSetup[$wgAntivirus]) {
1088                         wfDebug("$fname: unknown virus scanner: $wgAntivirus\n");
1089
1090                         $wgOut->addHTML( "<div class='error'>Bad configuration: unknown virus scanner: <i>$wgAntivirus</i></div>\n" ); #LOCALIZE
1091
1092                         return "unknown antivirus: $wgAntivirus";
1093                 }
1094
1095                 #look up scanner configuration
1096                 $virus_scanner= $wgAntivirusSetup[$wgAntivirus]["command"]; #command pattern
1097                 $virus_scanner_codes= $wgAntivirusSetup[$wgAntivirus]["codemap"]; #exit-code map
1098                 $msg_pattern= $wgAntivirusSetup[$wgAntivirus]["messagepattern"]; #message pattern
1099
1100                 $scanner= $virus_scanner; #copy, so we can resolve the pattern
1101
1102                 if (strpos($scanner,"%f")===false) $scanner.= " ".wfEscapeShellArg($file); #simple pattern: append file to scan
1103                 else $scanner= str_replace("%f",wfEscapeShellArg($file),$scanner); #complex pattern: replace "%f" with file to scan
1104
1105                 wfDebug("$fname: running virus scan: $scanner \n");
1106
1107                 #execute virus scanner
1108                 $code= false;
1109
1110                 #NOTE: there's a 50 line workaround to make stderr redirection work on windows, too.
1111                 #      that does not seem to be worth the pain.
1112                 #      Ask me (Duesentrieb) about it if it's ever needed.
1113                 $output = array();
1114                 if (wfIsWindows()) exec("$scanner",$output,$code);
1115                 else exec("$scanner 2>&1",$output,$code);
1116
1117                 $exit_code= $code; #remember for user feedback
1118
1119                 if ($virus_scanner_codes) { #map exit code to AV_xxx constants.
1120                         if (isset($virus_scanner_codes[$code])) {
1121                                 $code= $virus_scanner_codes[$code]; # explicit mapping
1122                         } else if (isset($virus_scanner_codes["*"])) {
1123                                 $code= $virus_scanner_codes["*"];   # fallback mapping
1124                         }
1125                 }
1126
1127                 if ($code===AV_SCAN_FAILED) { #scan failed (code was mapped to false by $virus_scanner_codes)
1128                         wfDebug("$fname: failed to scan $file (code $exit_code).\n");
1129
1130                         if ($wgAntivirusRequired) { return "scan failed (code $exit_code)"; }
1131                         else { return NULL; }
1132                 }
1133                 else if ($code===AV_SCAN_ABORTED) { #scan failed because filetype is unknown (probably imune)
1134                         wfDebug("$fname: unsupported file type $file (code $exit_code).\n");
1135                         return NULL;
1136                 }
1137                 else if ($code===AV_NO_VIRUS) {
1138                         wfDebug("$fname: file passed virus scan.\n");
1139                         return false; #no virus found
1140                 }
1141                 else {
1142                         $output= join("\n",$output);
1143                         $output= trim($output);
1144
1145                         if (!$output) $output= true; #if there's no output, return true
1146                         else if ($msg_pattern) {
1147                                 $groups= array();
1148                                 if (preg_match($msg_pattern,$output,$groups)) {
1149                                         if ($groups[1]) $output= $groups[1];
1150                                 }
1151                         }
1152
1153                         wfDebug("$fname: FOUND VIRUS! scanner feedback: $output");
1154                         return $output;
1155                 }
1156         }
1157
1158         /**
1159          * Check if the temporary file is MacBinary-encoded, as some uploads
1160          * from Internet Explorer on Mac OS Classic and Mac OS X will be.
1161          * If so, the data fork will be extracted to a second temporary file,
1162          * which will then be checked for validity and either kept or discarded.
1163          *
1164          * @access private
1165          */
1166         function checkMacBinary() {
1167                 $macbin = new MacBinary( $this->mUploadTempName );
1168                 if( $macbin->isValid() ) {
1169                         $dataFile = tempnam( wfTempDir(), "WikiMacBinary" );
1170                         $dataHandle = fopen( $dataFile, 'wb' );
1171
1172                         wfDebug( "SpecialUpload::checkMacBinary: Extracting MacBinary data fork to $dataFile\n" );
1173                         $macbin->extractData( $dataHandle );
1174
1175                         $this->mUploadTempName = $dataFile;
1176                         $this->mUploadSize = $macbin->dataForkLength();
1177
1178                         // We'll have to manually remove the new file if it's not kept.
1179                         $this->mRemoveTempFile = true;
1180                 }
1181                 $macbin->close();
1182         }
1183
1184         /**
1185          * If we've modified the upload file we need to manually remove it
1186          * on exit to clean up.
1187          * @access private
1188          */
1189         function cleanupTempFile() {
1190                 if( $this->mRemoveTempFile && file_exists( $this->mUploadTempName ) ) {
1191                         wfDebug( "SpecialUpload::cleanupTempFile: Removing temporary file $this->mUploadTempName\n" );
1192                         unlink( $this->mUploadTempName );
1193                 }
1194         }
1195
1196         /**
1197          * Check if there's an overwrite conflict and, if so, if restrictions
1198          * forbid this user from performing the upload.
1199          *
1200          * @return mixed true on success, WikiError on failure
1201          * @access private
1202          */
1203         function checkOverwrite( $name ) {
1204                 $img = Image::newFromName( $name );
1205                 if( is_null( $img ) ) {
1206                         // Uh... this shouldn't happen ;)
1207                         // But if it does, fall through to previous behavior
1208                         return false;
1209                 }
1210
1211                 $error = '';
1212                 if( $img->exists() ) {
1213                         global $wgUser, $wgOut;
1214                         if( $img->isLocal() ) {
1215                                 if( !$wgUser->isAllowed( 'reupload' ) ) {
1216                                         $error = 'fileexists-forbidden';
1217                                 }
1218                         } else {
1219                                 if( !$wgUser->isAllowed( 'reupload' ) ||
1220                                     !$wgUser->isAllowed( 'reupload-shared' ) ) {
1221                                         $error = "fileexists-shared-forbidden";
1222                                 }
1223                         }
1224                 }
1225
1226                 if( $error ) {
1227                         $errorText = wfMsg( $error, wfEscapeWikiText( $img->getName() ) );
1228                         return new WikiError( $wgOut->parse( $errorText ) );
1229                 }
1230
1231                 // Rockin', go ahead and upload
1232                 return true;
1233         }
1234
1235 }
1236
1237
1238 ?>