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, $wgMaxUploadSize;
 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 $wgMaxUploadSize, $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 $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                                 $dlink = Linker::makeKnownLinkObj( $nt );
 399                                 $warning .= '<li>'.wfMsgHtml( 'fileexists', $dlink ).'</li>';
 400                         } else {
 401                                 # If the file existed before and was deleted, warn the user of this
 402                                 # Don't bother doing so if the image exists now, however
 403                                 $image = new Image( $nt );
 404                                 if( $image->wasDeleted() ) {
 405                                         $ltitle = SpecialPage::getTitleFor( 'Log' );
 406                                         $llink = Linker::makeKnownLinkObj( $ltitle, wfMsgHtml( 'deletionlog' ), 'type=delete&page=' . $nt->getPrefixedUrl() );
 407                                         $warning .= wfOpenElement( 'li' ) . wfMsgWikiHtml( 'filewasdeleted', $llink ) . wfCloseElement( 'li' );
 408                                 }
 409                         }
 410
 411                         if( $warning != '' ) {
 412                                 /**
 413                                  * Stash the file in a temporary location; the user can choose
 414                                  * to let it through and we'll complete the upload then.
 415                                  */
 416                                 return $this->uploadWarning( $warning );
 417                         }
 418                 }
 419
 420                 /**
 421                  * Try actually saving the thing...
 422                  * It will show an error form on failure.
 423                  */
 424                 $hasBeenMunged = !empty( $this->mSessionKey ) || $this->mRemoveTempFile;
 425                 if( $this->saveUploadedFile( $this->mUploadSaveName,
 426                                              $this->mUploadTempName,
 427                                              $hasBeenMunged ) ) {
 428                         /**
 429                          * Update the upload log and create the description page
 430                          * if it's a new file.
 431                          */
 432                         $img = Image::newFromName( $this->mUploadSaveName );
 433                         $success = $img->recordUpload( $this->mUploadOldVersion,
 434                                                         $this->mUploadDescription,
 435                                                         $this->mLicense,
 436                                                         $this->mUploadCopyStatus,
 437                                                         $this->mUploadSource,
 438                                                         $this->mWatchthis );
 439
 440                         if ( $success ) {
 441                                 $this->showSuccess();
 442                                 wfRunHooks( 'UploadComplete', array( &$img ) );
 443                         } else {
 444                                 // Image::recordUpload() fails if the image went missing, which is
 445                                 // unlikely, hence the lack of a specialised message
 446                                 $wgOut->showFileNotFoundError( $this->mUploadSaveName );
 447                         }
 448                 }
 449         }
 450
 451         /**
 452          * Move the uploaded file from its temporary location to the final
 453          * destination. If a previous version of the file exists, move
 454          * it into the archive subdirectory.
 455          *
 456          * @todo If the later save fails, we may have disappeared the original file.
 457          *
 458          * @param string $saveName
 459          * @param string $tempName full path to the temporary file
 460          * @param bool $useRename if true, doesn't check that the source file
 461          *                        is a PHP-managed upload temporary
 462          */
 463         function saveUploadedFile( $saveName, $tempName, $useRename = false ) {
 464                 global $wgOut, $wgAllowCopyUploads;
 465
 466                 if ( !$useRename AND $wgAllowCopyUploads AND $this->mSourceType == 'web' ) $useRename = true;
 467
 468                 $fname= "SpecialUpload::saveUploadedFile";
 469
 470                 $dest = wfImageDir( $saveName );
 471                 $archive = wfImageArchiveDir( $saveName );
 472                 if ( !is_dir( $dest ) ) wfMkdirParents( $dest );
 473                 if ( !is_dir( $archive ) ) wfMkdirParents( $archive );
 474
 475                 $this->mSavedFile = "{$dest}/{$saveName}";
 476
 477                 if( is_file( $this->mSavedFile ) ) {
 478                         $this->mUploadOldVersion = gmdate( 'YmdHis' ) . "!{$saveName}";
 479                         wfSuppressWarnings();
 480                         $success = rename( $this->mSavedFile, "${archive}/{$this->mUploadOldVersion}" );
 481                         wfRestoreWarnings();
 482
 483                         if( ! $success ) {
 484                                 $wgOut->showFileRenameError( $this->mSavedFile,
 485                                   "${archive}/{$this->mUploadOldVersion}" );
 486                                 return false;
 487                         }
 488                         else wfDebug("$fname: moved file ".$this->mSavedFile." to ${archive}/{$this->mUploadOldVersion}\n");
 489                 }
 490                 else {
 491                         $this->mUploadOldVersion = '';
 492                 }
 493
 494                 wfSuppressWarnings();
 495                 $success = $useRename
 496                         ? rename( $tempName, $this->mSavedFile )
 497                         : move_uploaded_file( $tempName, $this->mSavedFile );
 498                 wfRestoreWarnings();
 499
 500                 if( ! $success ) {
 501                         $wgOut->showFileCopyError( $tempName, $this->mSavedFile );
 502                         return false;
 503                 } else {
 504                         wfDebug("$fname: wrote tempfile $tempName to ".$this->mSavedFile."\n");
 505                 }
 506
 507                 chmod( $this->mSavedFile, 0644 );
 508                 return true;
 509         }
 510
 511         /**
 512          * Stash a file in a temporary directory for later processing
 513          * after the user has confirmed it.
 514          *
 515          * If the user doesn't explicitly cancel or accept, these files
 516          * can accumulate in the temp directory.
 517          *
 518          * @param string $saveName - the destination filename
 519          * @param string $tempName - the source temporary file to save
 520          * @return string - full path the stashed file, or false on failure
 521          * @access private
 522          */
 523         function saveTempUploadedFile( $saveName, $tempName ) {
 524                 global $wgOut;
 525                 $archive = wfImageArchiveDir( $saveName, 'temp' );
 526                 if ( !is_dir ( $archive ) ) wfMkdirParents( $archive );
 527                 $stash = $archive . '/' . gmdate( "YmdHis" ) . '!' . $saveName;
 528
 529                 $success = $this->mRemoveTempFile
 530                         ? rename( $tempName, $stash )
 531                         : move_uploaded_file( $tempName, $stash );
 532                 if ( !$success ) {
 533                         $wgOut->showFileCopyError( $tempName, $stash );
 534                         return false;
 535                 }
 536
 537                 return $stash;
 538         }
 539
 540         /**
 541          * Stash a file in a temporary directory for later processing,
 542          * and save the necessary descriptive info into the session.
 543          * Returns a key value which will be passed through a form
 544          * to pick up the path info on a later invocation.
 545          *
 546          * @return int
 547          * @access private
 548          */
 549         function stashSession() {
 550                 $stash = $this->saveTempUploadedFile(
 551                         $this->mUploadSaveName, $this->mUploadTempName );
 552
 553                 if( !$stash ) {
 554                         # Couldn't save the file.
 555                         return false;
 556                 }
 557
 558                 $key = mt_rand( 0, 0x7fffffff );
 559                 $_SESSION['wsUploadData'][$key] = array(
 560                         'mUploadTempName' => $stash,
 561                         'mUploadSize'     => $this->mUploadSize,
 562                         'mOname'          => $this->mOname );
 563                 return $key;
 564         }
 565
 566         /**
 567          * Remove a temporarily kept file stashed by saveTempUploadedFile().
 568          * @access private
 569          * @return success
 570          */
 571         function unsaveUploadedFile() {
 572                 global $wgOut;
 573                 wfSuppressWarnings();
 574                 $success = unlink( $this->mUploadTempName );
 575                 wfRestoreWarnings();
 576                 if ( ! $success ) {
 577                         $wgOut->showFileDeleteError( $this->mUploadTempName );
 578                         return false;
 579                 } else {
 580                         return true;
 581                 }
 582         }
 583
 584         /* -------------------------------------------------------------- */
 585
 586         /**
 587          * Show some text and linkage on successful upload.
 588          * @access private
 589          */
 590         function showSuccess() {
 591                 global $wgOut, $wgContLang;
 592
 593                 $ilink = Linker::makeMediaLink( $this->mUploadSaveName, Image::imageUrl( $this->mUploadSaveName ) );
 594                 $dname = $wgContLang->getNsText( NS_IMAGE ) . ':'.$this->mUploadSaveName;
 595                 $dlink = Linker::makeKnownLink( $dname, $dname );
 596
 597                 $wgOut->addHTML( '<h2>' . wfMsgHtml( 'successfulupload' ) . "</h2>\n" );
 598                 $text = wfMsgWikiHtml( 'fileuploaded', $ilink, $dlink );
 599                 $wgOut->addHTML( $text );
 600                 $wgOut->returnToMain( false );
 601         }
 602
 603         /**
 604          * @param string $error as HTML
 605          * @access private
 606          */
 607         function uploadError( $error ) {
 608                 global $wgOut;
 609                 $wgOut->addHTML( "<h2>" . wfMsgHtml( 'uploadwarning' ) . "</h2>\n" );
 610                 $wgOut->addHTML( "<span class='error'>{$error}</span>\n" );
 611         }
 612
 613         /**
 614          * There's something wrong with this file, not enough to reject it
 615          * totally but we require manual intervention to save it for real.
 616          * Stash it away, then present a form asking to confirm or cancel.
 617          *
 618          * @param string $warning as HTML
 619          * @access private
 620          */
 621         function uploadWarning( $warning ) {
 622                 global $wgOut;
 623                 global $wgUseCopyrightUpload;
 624
 625                 $this->mSessionKey = $this->stashSession();
 626                 if( !$this->mSessionKey ) {
 627                         # Couldn't save file; an error has been displayed so let's go.
 628                         return;
 629                 }
 630
 631                 $wgOut->addHTML( "<h2>" . wfMsgHtml( 'uploadwarning' ) . "</h2>\n" );
 632                 $wgOut->addHTML( "<ul class='warning'>{$warning}</ul><br />\n" );
 633
 634                 $save = wfMsgHtml( 'savefile' );
 635                 $reupload = wfMsgHtml( 'reupload' );
 636                 $iw = wfMsgWikiHtml( 'ignorewarning' );
 637                 $reup = wfMsgWikiHtml( 'reuploaddesc' );
 638                 $titleObj = SpecialPage::getTitleFor( 'Upload' );
 639                 $action = $titleObj->escapeLocalURL( 'action=submit' );
 640
 641                 if ( $wgUseCopyrightUpload )
 642                 {
 643                         $copyright =  "
 644         <input type='hidden' name='wpUploadCopyStatus' value=\"" . htmlspecialchars( $this->mUploadCopyStatus ) . "\" />
 645         <input type='hidden' name='wpUploadSource' value=\"" . htmlspecialchars( $this->mUploadSource ) . "\" />
 646         ";
 647                 } else {
 648                         $copyright = "";
 649                 }
 650
 651                 $wgOut->addHTML( "
 652         <form id='uploadwarning' method='post' enctype='multipart/form-data' action='$action'>
 653                 <input type='hidden' name='wpIgnoreWarning' value='1' />
 654                 <input type='hidden' name='wpSessionKey' value=\"" . htmlspecialchars( $this->mSessionKey ) . "\" />
 655                 <input type='hidden' name='wpUploadDescription' value=\"" . htmlspecialchars( $this->mUploadDescription ) . "\" />
 656                 <input type='hidden' name='wpLicense' value=\"" . htmlspecialchars( $this->mLicense ) . "\" />
 657                 <input type='hidden' name='wpDestFile' value=\"" . htmlspecialchars( $this->mDestFile ) . "\" />
 658                 <input type='hidden' name='wpWatchthis' value=\"" . htmlspecialchars( intval( $this->mWatchthis ) ) . "\" />
 659         {$copyright}
 660         <table border='0'>
 661                 <tr>
 662                         <tr>
 663                                 <td align='right'>
 664                                         <input tabindex='2' type='submit' name='wpUpload' value=\"$save\" />
 665                                 </td>
 666                                 <td align='left'>$iw</td>
 667                         </tr>
 668                         <tr>
 669                                 <td align='right'>
 670                                         <input tabindex='2' type='submit' name='wpReUpload' value=\"{$reupload}\" />
 671                                 </td>
 672                                 <td align='left'>$reup</td>
 673                         </tr>
 674                 </tr>
 675         </table></form>\n" );
 676         }
 677
 678         /**
 679          * Displays the main upload form, optionally with a highlighted
 680          * error message up at the top.
 681          *
 682          * @param string $msg as HTML
 683          * @access private
 684          */
 685         function mainUploadForm( $msg='' ) {
 686                 global $wgOut, $wgUser;
 687                 global $wgUseCopyrightUpload;
 688                 global $wgRequest, $wgAllowCopyUploads;
 689
 690                 $cols = intval($wgUser->getOption( 'cols' ));
 691                 $ew = $wgUser->getOption( 'editwidth' );
 692                 if ( $ew ) $ew = " style=\"width:100%\"";
 693                 else $ew = '';
 694
 695                 if ( '' != $msg ) {
 696                         $sub = wfMsgHtml( 'uploaderror' );
 697                         $wgOut->addHTML( "<h2>{$sub}</h2>\n" .
 698                           "<span class='error'>{$msg}</span>\n" );
 699                 }
 700                 $wgOut->addHTML( '<div id="uploadtext">' );
 701                 $wgOut->addWikiText( wfMsg( 'uploadtext' ) );
 702                 $wgOut->addHTML( '</div>' );
 703
 704
 705                 $sourcefilename = wfMsgHtml( 'sourcefilename' );
 706                 $destfilename = wfMsgHtml( 'destfilename' );
 707                 $summary = wfMsgWikiHtml( 'fileuploadsummary' );
 708
 709                 $licenses = new Licenses();
 710                 $license = wfMsgHtml( 'license' );
 711                 $nolicense = wfMsgHtml( 'nolicense' );
 712                 $licenseshtml = $licenses->getHtml();
 713
 714                 $ulb = wfMsgHtml( 'uploadbtn' );
 715
 716
 717                 $titleObj = SpecialPage::getTitleFor( 'Upload' );
 718                 $action = $titleObj->escapeLocalURL();
 719
 720                 $encDestFile = htmlspecialchars( $this->mDestFile );
 721
 722                 $watchChecked =
 723                         ( $wgUser->getOption( 'watchdefault' ) ||
 724                                 ( $wgUser->getOption( 'watchcreations' ) && $this->mDestFile == '' ) )
 725                         ? 'checked="checked"'
 726                         : '';
 727
 728                 // Prepare form for upload or upload/copy
 729                 if( $wgAllowCopyUploads && $wgUser->isAllowed( 'upload_by_url' ) ) {
 730                         $source_comment = wfMsgHtml( 'upload_source_url' );
 731                         $filename_form =
 732                                 "<input type='radio' id='wpSourceTypeFile' name='wpSourceType' value='file' onchange='toggle_element_activation(\"wpUploadFileURL\",\"wpUploadFile\")' checked />" .
 733                                 "<input tabindex='1' type='file' name='wpUploadFile' id='wpUploadFile' onfocus='toggle_element_activation(\"wpUploadFileURL\",\"wpUploadFile\");toggle_element_check(\"wpSourceTypeFile\",\"wpSourceTypeURL\")'" .
 734                                 ($this->mDestFile?"":"onchange='fillDestFilename(\"wpUploadFile\")' ") . "size='40' />" .
 735                                 wfMsgHTML( 'upload_source_file' ) . "<br/>" .
 736                                 "<input type='radio' id='wpSourceTypeURL' name='wpSourceType' value='web' onchange='toggle_element_activation(\"wpUploadFile\",\"wpUploadFileURL\")' />" .
 737                                 "<input tabindex='1' type='text' name='wpUploadFileURL' id='wpUploadFileURL' onfocus='toggle_element_activation(\"wpUploadFile\",\"wpUploadFileURL\");toggle_element_check(\"wpSourceTypeURL\",\"wpSourceTypeFile\")'" .
 738                                 ($this->mDestFile?"":"onchange='fillDestFilename(\"wpUploadFileURL\")' ") . "size='40' DISABLED />" .
 739                                 wfMsgHtml( 'upload_source_url' ) ;
 740                 } else {
 741                         $filename_form =
 742                                 "<input tabindex='1' type='file' name='wpUploadFile' id='wpUploadFile' " .
 743                                 ($this->mDestFile?"":"onchange='fillDestFilename(\"wpUploadFile\")' ") .
 744                                 "size='40' />" .
 745                                 "<input type='hidden' name='wpSourceType' value='file' />" ;
 746                 }
 747
 748                 $wgOut->addHTML( "
 749         <form id='upload' method='post' enctype='multipart/form-data' action=\"$action\">
 750                 <table border='0'>
 751                 <tr>
 752                         <td align='right' valign='top'><label for='wpUploadFile'>{$sourcefilename}:</label></td>
 753                         <td align='left'>
 754                                 {$filename_form}
 755                         </td>
 756                 </tr>
 757                 <tr>
 758                         <td align='right'><label for='wpDestFile'>{$destfilename}:</label></td>
 759                         <td align='left'>
 760                                 <input tabindex='2' type='text' name='wpDestFile' id='wpDestFile' size='40' value=\"$encDestFile\" />
 761                         </td>
 762                 </tr>
 763                 <tr>
 764                         <td align='right'><label for='wpUploadDescription'>{$summary}</label></td>
 765                         <td align='left'>
 766                                 <textarea tabindex='3' name='wpUploadDescription' id='wpUploadDescription' rows='6' cols='{$cols}'{$ew}>" . htmlspecialchars( $this->mUploadDescription ) . "</textarea>
 767                         </td>
 768                 </tr>
 769                 <tr>" );
 770
 771                 if ( $licenseshtml != '' ) {
 772                         global $wgStylePath;
 773                         $wgOut->addHTML( "
 774                         <td align='right'><label for='wpLicense'>$license:</label></td>
 775                         <td align='left'>
 776                                 <script type='text/javascript' src=\"$wgStylePath/common/upload.js\"></script>
 777                                 <select name='wpLicense' id='wpLicense' tabindex='4'
 778                                         onchange='licenseSelectorCheck()'>
 779                                         <option value=''>$nolicense</option>
 780                                         $licenseshtml
 781                                 </select>
 782                         </td>
 783                         </tr>
 784                         <tr>
 785                 ");
 786                 }
 787
 788                 if ( $wgUseCopyrightUpload ) {
 789                         $filestatus = wfMsgHtml ( 'filestatus' );
 790                         $copystatus =  htmlspecialchars( $this->mUploadCopyStatus );
 791                         $filesource = wfMsgHtml ( 'filesource' );
 792                         $uploadsource = htmlspecialchars( $this->mUploadSource );
 793
 794                         $wgOut->addHTML( "
 795                                 <td align='right' nowrap='nowrap'><label for='wpUploadCopyStatus'>$filestatus:</label></td>
 796                                 <td><input tabindex='5' type='text' name='wpUploadCopyStatus' id='wpUploadCopyStatus' value=\"$copystatus\" size='40' /></td>
 797                         </tr>
 798                         <tr>
 799                                 <td align='right'><label for='wpUploadCopyStatus'>$filesource:</label></td>
 800                                 <td><input tabindex='6' type='text' name='wpUploadSource' id='wpUploadCopyStatus' value=\"$uploadsource\" size='40' /></td>
 801                         </tr>
 802                         <tr>
 803                 ");
 804                 }
 805
 806
 807                 $wgOut->addHtml( "
 808                 <td></td>
 809                 <td>
 810                         <input tabindex='7' type='checkbox' name='wpWatchthis' id='wpWatchthis' $watchChecked value='true' />
 811                         <label for='wpWatchthis'>" . wfMsgHtml( 'watchthisupload' ) . "</label>
 812                         <input tabindex='8' type='checkbox' name='wpIgnoreWarning' id='wpIgnoreWarning' value='true' />
 813                         <label for='wpIgnoreWarning'>" . wfMsgHtml( 'ignorewarnings' ) . "</label>
 814                 </td>
 815         </tr>
 816         <tr>
 817
 818         </tr>
 819         <tr>
 820                 <td></td>
 821                 <td align='left'><input tabindex='9' type='submit' name='wpUpload' value=\"{$ulb}\" /></td>
 822         </tr>
 823
 824         <tr>
 825                 <td></td>
 826                 <td align='left'>
 827                 " );
 828                 $wgOut->addWikiText( wfMsgForContent( 'edittools' ) );
 829                 $wgOut->addHTML( "
 830                 </td>
 831         </tr>
 832
 833         </table>
 834         </form>" );
 835         }
 836
 837         /* -------------------------------------------------------------- */
 838
 839         /**
 840          * Split a file into a base name and all dot-delimited 'extensions'
 841          * on the end. Some web server configurations will fall back to
 842          * earlier pseudo-'extensions' to determine type and execute
 843          * scripts, so the blacklist needs to check them all.
 844          *
 845          * @return array
 846          */
 847         function splitExtensions( $filename ) {
 848                 $bits = explode( '.', $filename );
 849                 $basename = array_shift( $bits );
 850                 return array( $basename, $bits );
 851         }
 852
 853         /**
 854          * Perform case-insensitive match against a list of file extensions.
 855          * Returns true if the extension is in the list.
 856          *
 857          * @param string $ext
 858          * @param array $list
 859          * @return bool
 860          */
 861         function checkFileExtension( $ext, $list ) {
 862                 return in_array( strtolower( $ext ), $list );
 863         }
 864
 865         /**
 866          * Perform case-insensitive match against a list of file extensions.
 867          * Returns true if any of the extensions are in the list.
 868          *
 869          * @param array $ext
 870          * @param array $list
 871          * @return bool
 872          */
 873         function checkFileExtensionList( $ext, $list ) {
 874                 foreach( $ext as $e ) {
 875                         if( in_array( strtolower( $e ), $list ) ) {
 876                                 return true;
 877                         }
 878                 }
 879                 return false;
 880         }
 881
 882         /**
 883          * Verifies that it's ok to include the uploaded file
 884          *
 885          * @param string $tmpfile the full path of the temporary file to verify
 886          * @param string $extension The filename extension that the file is to be served with
 887          * @return mixed true of the file is verified, a WikiError object otherwise.
 888          */
 889         function verify( $tmpfile, $extension ) {
 890                 #magically determine mime type
 891                 $magic=& MimeMagic::singleton();
 892                 $mime= $magic->guessMimeType($tmpfile,false);
 893
 894                 $fname= "SpecialUpload::verify";
 895
 896                 #check mime type, if desired
 897                 global $wgVerifyMimeType;
 898                 if ($wgVerifyMimeType) {
 899
 900                         #check mime type against file extension
 901                         if( !$this->verifyExtension( $mime, $extension ) ) {
 902                                 return new WikiErrorMsg( 'uploadcorrupt' );
 903                         }
 904
 905                         #check mime type blacklist
 906                         global $wgMimeTypeBlacklist;
 907                         if( isset($wgMimeTypeBlacklist) && !is_null($wgMimeTypeBlacklist)
 908                                 && $this->checkFileExtension( $mime, $wgMimeTypeBlacklist ) ) {
 909                                 return new WikiErrorMsg( 'badfiletype', htmlspecialchars( $mime ) );
 910                         }
 911                 }
 912
 913                 #check for htmlish code and javascript
 914                 if( $this->detectScript ( $tmpfile, $mime, $extension ) ) {
 915                         return new WikiErrorMsg( 'uploadscripted' );
 916                 }
 917
 918                 /**
 919                 * Scan the uploaded file for viruses
 920                 */
 921                 $virus= $this->detectVirus($tmpfile);
 922                 if ( $virus ) {
 923                         return new WikiErrorMsg( 'uploadvirus', htmlspecialchars($virus) );
 924                 }
 925
 926                 wfDebug( "$fname: all clear; passing.\n" );
 927                 return true;
 928         }
 929
 930         /**
 931          * Checks if the mime type of the uploaded file matches the file extension.
 932          *
 933          * @param string $mime the mime type of the uploaded file
 934          * @param string $extension The filename extension that the file is to be served with
 935          * @return bool
 936          */
 937         function verifyExtension( $mime, $extension ) {
 938                 $fname = 'SpecialUpload::verifyExtension';
 939
 940                 $magic =& MimeMagic::singleton();
 941
 942                 if ( ! $mime || $mime == 'unknown' || $mime == 'unknown/unknown' )
 943                         if ( ! $magic->isRecognizableExtension( $extension ) ) {
 944                                 wfDebug( "$fname: passing file with unknown detected mime type; unrecognized extension '$extension', can't verify\n" );
 945                                 return true;
 946                         } else {
 947                                 wfDebug( "$fname: rejecting file with unknown detected mime type; recognized extension '$extension', so probably invalid file\n" );
 948                                 return false;
 949                         }
 950
 951                 $match= $magic->isMatchingExtension($extension,$mime);
 952
 953                 if ($match===NULL) {
 954                         wfDebug( "$fname: no file extension known for mime type $mime, passing file\n" );
 955                         return true;
 956                 } elseif ($match===true) {
 957                         wfDebug( "$fname: mime type $mime matches extension $extension, passing file\n" );
 958
 959                         #TODO: if it's a bitmap, make sure PHP or ImageMagic resp. can handle it!
 960                         return true;
 961
 962                 } else {
 963                         wfDebug( "$fname: mime type $mime mismatches file extension $extension, rejecting file\n" );
 964                         return false;
 965                 }
 966         }
 967
 968         /** Heuristig for detecting files that *could* contain JavaScript instructions or
 969         * things that may look like HTML to a browser and are thus
 970         * potentially harmful. The present implementation will produce false positives in some situations.
 971         *
 972         * @param string $file Pathname to the temporary upload file
 973         * @param string $mime The mime type of the file
 974         * @param string $extension The extension of the file
 975         * @return bool true if the file contains something looking like embedded scripts
 976         */
 977         function detectScript($file, $mime, $extension) {
 978                 global $wgAllowTitlesInSVG;
 979
 980                 #ugly hack: for text files, always look at the entire file.
 981                 #For binarie field, just check the first K.
 982
 983                 if (strpos($mime,'text/')===0) $chunk = file_get_contents( $file );
 984                 else {
 985                         $fp = fopen( $file, 'rb' );
 986                         $chunk = fread( $fp, 1024 );
 987                         fclose( $fp );
 988                 }
 989
 990                 $chunk= strtolower( $chunk );
 991
 992                 if (!$chunk) return false;
 993
 994                 #decode from UTF-16 if needed (could be used for obfuscation).
 995                 if (substr($chunk,0,2)=="\xfe\xff") $enc= "UTF-16BE";
 996                 elseif (substr($chunk,0,2)=="\xff\xfe") $enc= "UTF-16LE";
 997                 else $enc= NULL;
 998
 999                 if ($enc) $chunk= iconv($enc,"ASCII//IGNORE",$chunk);
1000
1001                 $chunk= trim($chunk);
1002
1003                 #FIXME: convert from UTF-16 if necessarry!
1004
1005                 wfDebug("SpecialUpload::detectScript: checking for embedded scripts and HTML stuff\n");
1006
1007                 #check for HTML doctype
1008                 if (eregi("<!DOCTYPE *X?HTML",$chunk)) return true;
1009
1010                 /**
1011                 * Internet Explorer for Windows performs some really stupid file type
1012                 * autodetection which can cause it to interpret valid image files as HTML
1013                 * and potentially execute JavaScript, creating a cross-site scripting
1014                 * attack vectors.
1015                 *
1016                 * Apple's Safari browser also performs some unsafe file type autodetection
1017                 * which can cause legitimate files to be interpreted as HTML if the
1018                 * web server is not correctly configured to send the right content-type
1019                 * (or if you're really uploading plain text and octet streams!)
1020                 *
1021                 * Returns true if IE is likely to mistake the given file for HTML.
1022                 * Also returns true if Safari would mistake the given file for HTML
1023                 * when served with a generic content-type.
1024                 */
1025
1026                 $tags = array(
1027                         '<body',
1028                         '<head',
1029                         '<html',   #also in safari
1030                         '<img',
1031                         '<pre',
1032                         '<script', #also in safari
1033                         '<table'
1034                         );
1035                 if( ! $wgAllowTitlesInSVG && $extension !== 'svg' && $mime !== 'image/svg' ) {
1036                         $tags[] = '<title';
1037                 }
1038
1039                 foreach( $tags as $tag ) {
1040                         if( false !== strpos( $chunk, $tag ) ) {
1041                                 return true;
1042                         }
1043                 }
1044
1045                 /*
1046                 * look for javascript
1047                 */
1048
1049                 #resolve entity-refs to look at attributes. may be harsh on big files... cache result?
1050                 $chunk = Sanitizer::decodeCharReferences( $chunk );
1051
1052                 #look for script-types
1053                 if (preg_match("!type\s*=\s*['\"]?\s*(\w*/)?(ecma|java)!sim",$chunk)) return true;
1054
1055                 #look for html-style script-urls
1056                 if (preg_match("!(href|src|data)\s*=\s*['\"]?\s*(ecma|java)script:!sim",$chunk)) return true;
1057
1058                 #look for css-style script-urls
1059                 if (preg_match("!url\s*\(\s*['\"]?\s*(ecma|java)script:!sim",$chunk)) return true;
1060
1061                 wfDebug("SpecialUpload::detectScript: no scripts found\n");
1062                 return false;
1063         }
1064
1065         /** Generic wrapper function for a virus scanner program.
1066         * This relies on the $wgAntivirus and $wgAntivirusSetup variables.
1067         * $wgAntivirusRequired may be used to deny upload if the scan fails.
1068         *
1069         * @param string $file Pathname to the temporary upload file
1070         * @return mixed false if not virus is found, NULL if the scan fails or is disabled,
1071         *         or a string containing feedback from the virus scanner if a virus was found.
1072         *         If textual feedback is missing but a virus was found, this function returns true.
1073         */
1074         function detectVirus($file) {
1075                 global $wgAntivirus, $wgAntivirusSetup, $wgAntivirusRequired, $wgOut;
1076
1077                 $fname= "SpecialUpload::detectVirus";
1078
1079                 if (!$wgAntivirus) { #disabled?
1080                         wfDebug("$fname: virus scanner disabled\n");
1081
1082                         return NULL;
1083                 }
1084
1085                 if (!$wgAntivirusSetup[$wgAntivirus]) {
1086                         wfDebug("$fname: unknown virus scanner: $wgAntivirus\n");
1087
1088                         $wgOut->addHTML( "<div class='error'>Bad configuration: unknown virus scanner: <i>$wgAntivirus</i></div>\n" ); #LOCALIZE
1089
1090                         return "unknown antivirus: $wgAntivirus";
1091                 }
1092
1093                 #look up scanner configuration
1094                 $virus_scanner= $wgAntivirusSetup[$wgAntivirus]["command"]; #command pattern
1095                 $virus_scanner_codes= $wgAntivirusSetup[$wgAntivirus]["codemap"]; #exit-code map
1096                 $msg_pattern= $wgAntivirusSetup[$wgAntivirus]["messagepattern"]; #message pattern
1097
1098                 $scanner= $virus_scanner; #copy, so we can resolve the pattern
1099
1100                 if (strpos($scanner,"%f")===false) $scanner.= " ".wfEscapeShellArg($file); #simple pattern: append file to scan
1101                 else $scanner= str_replace("%f",wfEscapeShellArg($file),$scanner); #complex pattern: replace "%f" with file to scan
1102
1103                 wfDebug("$fname: running virus scan: $scanner \n");
1104
1105                 #execute virus scanner
1106                 $code= false;
1107
1108                 #NOTE: there's a 50 line workaround to make stderr redirection work on windows, too.
1109                 #      that does not seem to be worth the pain.
1110                 #      Ask me (Duesentrieb) about it if it's ever needed.
1111                 if (wfIsWindows()) exec("$scanner",$output,$code);
1112                 else exec("$scanner 2>&1",$output,$code);
1113
1114                 $exit_code= $code; #remeber for user feedback
1115
1116                 if ($virus_scanner_codes) { #map exit code to AV_xxx constants.
1117                         if (isset($virus_scanner_codes[$code])) $code= $virus_scanner_codes[$code]; #explicite mapping
1118                         else if (isset($virus_scanner_codes["*"])) $code= $virus_scanner_codes["*"]; #fallback mapping
1119                 }
1120
1121                 if ($code===AV_SCAN_FAILED) { #scan failed (code was mapped to false by $virus_scanner_codes)
1122                         wfDebug("$fname: failed to scan $file (code $exit_code).\n");
1123
1124                         if ($wgAntivirusRequired) return "scan failed (code $exit_code)";
1125                         else return NULL;
1126                 }
1127                 else if ($code===AV_SCAN_ABORTED) { #scan failed because filetype is unknown (probably imune)
1128                         wfDebug("$fname: unsupported file type $file (code $exit_code).\n");
1129                         return NULL;
1130                 }
1131                 else if ($code===AV_NO_VIRUS) {
1132                         wfDebug("$fname: file passed virus scan.\n");
1133                         return false; #no virus found
1134                 }
1135                 else {
1136                         $output= join("\n",$output);
1137                         $output= trim($output);
1138
1139                         if (!$output) $output= true; #if ther's no output, return true
1140                         else if ($msg_pattern) {
1141                                 $groups= array();
1142                                 if (preg_match($msg_pattern,$output,$groups)) {
1143                                         if ($groups[1]) $output= $groups[1];
1144                                 }
1145                         }
1146
1147                         wfDebug("$fname: FOUND VIRUS! scanner feedback: $output");
1148                         return $output;
1149                 }
1150         }
1151
1152         /**
1153          * Check if the temporary file is MacBinary-encoded, as some uploads
1154          * from Internet Explorer on Mac OS Classic and Mac OS X will be.
1155          * If so, the data fork will be extracted to a second temporary file,
1156          * which will then be checked for validity and either kept or discarded.
1157          *
1158          * @access private
1159          */
1160         function checkMacBinary() {
1161                 $macbin = new MacBinary( $this->mUploadTempName );
1162                 if( $macbin->isValid() ) {
1163                         $dataFile = tempnam( wfTempDir(), "WikiMacBinary" );
1164                         $dataHandle = fopen( $dataFile, 'wb' );
1165
1166                         wfDebug( "SpecialUpload::checkMacBinary: Extracting MacBinary data fork to $dataFile\n" );
1167                         $macbin->extractData( $dataHandle );
1168
1169                         $this->mUploadTempName = $dataFile;
1170                         $this->mUploadSize = $macbin->dataForkLength();
1171
1172                         // We'll have to manually remove the new file if it's not kept.
1173                         $this->mRemoveTempFile = true;
1174                 }
1175                 $macbin->close();
1176         }
1177
1178         /**
1179          * If we've modified the upload file we need to manually remove it
1180          * on exit to clean up.
1181          * @access private
1182          */
1183         function cleanupTempFile() {
1184                 if( $this->mRemoveTempFile && file_exists( $this->mUploadTempName ) ) {
1185                         wfDebug( "SpecialUpload::cleanupTempFile: Removing temporary file $this->mUploadTempName\n" );
1186                         unlink( $this->mUploadTempName );
1187                 }
1188         }
1189
1190         /**
1191          * Check if there's an overwrite conflict and, if so, if restrictions
1192          * forbid this user from performing the upload.
1193          *
1194          * @return mixed true on success, WikiError on failure
1195          * @access private
1196          */
1197         function checkOverwrite( $name ) {
1198                 $img = Image::newFromName( $name );
1199                 if( is_null( $img ) ) {
1200                         // Uh... this shouldn't happen ;)
1201                         // But if it does, fall through to previous behavior
1202                         return false;
1203                 }
1204
1205                 $error = '';
1206                 if( $img->exists() ) {
1207                         global $wgUser, $wgOut;
1208                         if( $img->isLocal() ) {
1209                                 if( !$wgUser->isAllowed( 'reupload' ) ) {
1210                                         $error = 'fileexists-forbidden';
1211                                 }
1212                         } else {
1213                                 if( !$wgUser->isAllowed( 'reupload' ) ||
1214                                     !$wgUser->isAllowed( 'reupload-shared' ) ) {
1215                                         $error = "fileexists-shared-forbidden";
1216                                 }
1217                         }
1218                 }
1219
1220                 if( $error ) {
1221                         $errorText = wfMsg( $error, wfEscapeWikiText( $img->getName() ) );
1222                         return new WikiError( $wgOut->parse( $errorText ) );
1223                 }
1224
1225                 // Rockin', go ahead and upload
1226                 return true;
1227         }
1228
1229 }
1230
1231
1232 ?>