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         # Placeholders for text injection by hooks (must be HTML)
  34         # extensions should take care to _append_ to the present value
  35         var $uploadFormTextTop;
  36         var $uploadFormTextAfterSummary;
  37
  38         /**#@-*/
  39
  40         /**
  41          * Constructor : initialise object
  42          * Get data POSTed through the form and assign them to the object
  43          * @param $request Data posted.
  44          */
  45         function UploadForm( &$request ) {
  46                 global $wgAllowCopyUploads;
  47                 $this->mDestFile          = $request->getText( 'wpDestFile' );
  48
  49                 if( !$request->wasPosted() ) {
  50                         # GET requests just give the main form; no data except wpDestfile.
  51                         return;
  52                 }
  53
  54          # Placeholders for text injection by hooks (empty per default)
  55          $this->uploadFormTextTop = "";
  56          $this->uploadFormTextAfterSummary = "";
  57
  58                 $this->mIgnoreWarning     = $request->getCheck( 'wpIgnoreWarning' );
  59                 $this->mReUpload          = $request->getCheck( 'wpReUpload' );
  60                 $this->mUpload            = $request->getCheck( 'wpUpload' );
  61
  62                 $this->mUploadDescription = $request->getText( 'wpUploadDescription' );
  63                 $this->mLicense           = $request->getText( 'wpLicense' );
  64                 $this->mUploadCopyStatus  = $request->getText( 'wpUploadCopyStatus' );
  65                 $this->mUploadSource      = $request->getText( 'wpUploadSource' );
  66                 $this->mWatchthis         = $request->getBool( 'wpWatchthis' );
  67                 $this->mSourceType         = $request->getText( 'wpSourceType' );
  68                 wfDebug( "UploadForm: watchthis is: '$this->mWatchthis'\n" );
  69
  70                 $this->mAction            = $request->getVal( 'action' );
  71
  72                 $this->mSessionKey        = $request->getInt( 'wpSessionKey' );
  73                 if( !empty( $this->mSessionKey ) &&
  74                         isset( $_SESSION['wsUploadData'][$this->mSessionKey] ) ) {
  75                         /**
  76                          * Confirming a temporarily stashed upload.
  77                          * We don't want path names to be forged, so we keep
  78                          * them in the session on the server and just give
  79                          * an opaque key to the user agent.
  80                          */
  81                         $data = $_SESSION['wsUploadData'][$this->mSessionKey];
  82                         $this->mUploadTempName   = $data['mUploadTempName'];
  83                         $this->mUploadSize       = $data['mUploadSize'];
  84                         $this->mOname            = $data['mOname'];
  85                         $this->mUploadError      = 0/*UPLOAD_ERR_OK*/;
  86                         $this->mStashed          = true;
  87                         $this->mRemoveTempFile   = false;
  88                 } else {
  89                         /**
  90                          *Check for a newly uploaded file.
  91                          */
  92                         if( $wgAllowCopyUploads && $this->mSourceType == 'web' ) {
  93                                 $this->initializeFromUrl( $request );
  94                         } else {
  95                                 $this->initializeFromUpload( $request );
  96                         }
  97                 }
  98         }
  99
 100         /**
 101          * Initialize the uploaded file from PHP data
 102          * @access private
 103          */
 104         function initializeFromUpload( $request ) {
 105                 $this->mUploadTempName = $request->getFileTempName( 'wpUploadFile' );
 106                 $this->mUploadSize     = $request->getFileSize( 'wpUploadFile' );
 107                 $this->mOname          = $request->getFileName( 'wpUploadFile' );
 108                 $this->mUploadError    = $request->getUploadError( 'wpUploadFile' );
 109                 $this->mSessionKey     = false;
 110                 $this->mStashed        = false;
 111                 $this->mRemoveTempFile = false; // PHP will handle this
 112         }
 113
 114         /**
 115          * Copy a web file to a temporary file
 116          * @access private
 117          */
 118         function initializeFromUrl( $request ) {
 119                 global $wgTmpDirectory;
 120                 $url = $request->getText( 'wpUploadFileURL' );
 121                 $local_file = tempnam( $wgTmpDirectory, 'WEBUPLOAD' );
 122
 123                 $this->mUploadTempName = $local_file;
 124                 $this->mUploadError    = $this->curlCopy( $url, $local_file );
 125                 $this->mUploadSize     = $this->mUploadTempFileSize;
 126                 $this->mOname          = array_pop( explode( '/', $url ) );
 127                 $this->mSessionKey     = false;
 128                 $this->mStashed        = false;
 129
 130                 // PHP won't auto-cleanup the file
 131                 $this->mRemoveTempFile = file_exists( $local_file );
 132         }
 133
 134         /**
 135          * Safe copy from URL
 136          * Returns true if there was an error, false otherwise
 137          */
 138         private function curlCopy( $url, $dest ) {
 139                 global $wgUser, $wgOut;
 140
 141                 if( !$wgUser->isAllowed( 'upload_by_url' ) ) {
 142                         $wgOut->permissionRequired( 'upload_by_url' );
 143                         return true;
 144                 }
 145
 146                 # Maybe remove some pasting blanks :-)
 147                 $url =  trim( $url );
 148                 if( stripos($url, 'http://') !== 0 && stripos($url, 'ftp://') !== 0 ) {
 149                         # Only HTTP or FTP URLs
 150                         $wgOut->errorPage( 'upload-proto-error', 'upload-proto-error-text' );
 151                         return true;
 152                 }
 153
 154                 # Open temporary file
 155                 $this->mUploadTempFile = @fopen( $this->mUploadTempName, "wb" );
 156                 if( $this->mUploadTempFile === false ) {
 157                         # Could not open temporary file to write in
 158                         $wgOut->errorPage( 'upload-file-error', 'upload-file-error-text');
 159                         return true;
 160                 }
 161
 162                 $ch = curl_init();
 163                 curl_setopt( $ch, CURLOPT_HTTP_VERSION, 1.0); # Probably not needed, but apparently can work around some bug
 164                 curl_setopt( $ch, CURLOPT_TIMEOUT, 10); # 10 seconds timeout
 165                 curl_setopt( $ch, CURLOPT_LOW_SPEED_LIMIT, 512); # 0.5KB per second minimum transfer speed
 166                 curl_setopt( $ch, CURLOPT_URL, $url);
 167                 curl_setopt( $ch, CURLOPT_WRITEFUNCTION, array( $this, 'uploadCurlCallback' ) );
 168                 curl_exec( $ch );
 169                 $error = curl_errno( $ch ) ? true : false;
 170                 $errornum =  curl_errno( $ch );
 171                 // if ( $error ) print curl_error ( $ch ) ; # Debugging output
 172                 curl_close( $ch );
 173
 174                 fclose( $this->mUploadTempFile );
 175                 unset( $this->mUploadTempFile );
 176                 if( $error ) {
 177                         unlink( $dest );
 178                         if( wfEmptyMsg( "upload-curl-error$errornum", wfMsg("upload-curl-error$errornum") ) )
 179                                 $wgOut->errorPage( 'upload-misc-error', 'upload-misc-error-text' );
 180                         else
 181                                 $wgOut->errorPage( "upload-curl-error$errornum", "upload-curl-error$errornum-text" );
 182                 }
 183
 184                 return $error;
 185         }
 186
 187         /**
 188          * Callback function for CURL-based web transfer
 189          * Write data to file unless we've passed the length limit;
 190          * if so, abort immediately.
 191          * @access private
 192          */
 193         function uploadCurlCallback( $ch, $data ) {
 194                 global $wgMaxUploadSize;
 195                 $length = strlen( $data );
 196                 $this->mUploadTempFileSize += $length;
 197                 if( $this->mUploadTempFileSize > $wgMaxUploadSize ) {
 198                         return 0;
 199                 }
 200                 fwrite( $this->mUploadTempFile, $data );
 201                 return $length;
 202         }
 203
 204         /**
 205          * Start doing stuff
 206          * @access public
 207          */
 208         function execute() {
 209                 global $wgUser, $wgOut;
 210                 global $wgEnableUploads, $wgUploadDirectory;
 211
 212                 # Check uploading enabled
 213                 if( !$wgEnableUploads ) {
 214                         $wgOut->showErrorPage( 'uploaddisabled', 'uploaddisabledtext' );
 215                         return;
 216                 }
 217
 218                 # Check permissions
 219                 if( !$wgUser->isAllowed( 'upload' ) ) {
 220                         if( !$wgUser->isLoggedIn() ) {
 221                                 $wgOut->showErrorPage( 'uploadnologin', 'uploadnologintext' );
 222                         } else {
 223                                 $wgOut->permissionRequired( 'upload' );
 224                         }
 225                         return;
 226                 }
 227
 228                 # Check blocks
 229                 if( $wgUser->isBlocked() ) {
 230                         $wgOut->blockedPage();
 231                         return;
 232                 }
 233
 234                 if( wfReadOnly() ) {
 235                         $wgOut->readOnlyPage();
 236                         return;
 237                 }
 238
 239                 /** Check if the image directory is writeable, this is a common mistake */
 240                 if( !is_writeable( $wgUploadDirectory ) ) {
 241                         $wgOut->addWikiText( wfMsg( 'upload_directory_read_only', $wgUploadDirectory ) );
 242                         return;
 243                 }
 244
 245                 if( $this->mReUpload ) {
 246                         if( !$this->unsaveUploadedFile() ) {
 247                                 return;
 248                         }
 249                         $this->mainUploadForm();
 250                 } else if( 'submit' == $this->mAction || $this->mUpload ) {
 251                         $this->processUpload();
 252                 } else {
 253                         $this->mainUploadForm();
 254                 }
 255
 256                 $this->cleanupTempFile();
 257         }
 258
 259         /* -------------------------------------------------------------- */
 260
 261         /**
 262          * Really do the upload
 263          * Checks are made in SpecialUpload::execute()
 264          * @access private
 265          */
 266         function processUpload() {
 267                 global $wgUser, $wgOut;
 268
 269                 /* Check for PHP error if any, requires php 4.2 or newer */
 270                 if( $this->mUploadError == 1/*UPLOAD_ERR_INI_SIZE*/ ) {
 271                         $this->mainUploadForm( wfMsgHtml( 'largefileserver' ) );
 272                         return;
 273                 }
 274
 275                 /**
 276                  * If there was no filename or a zero size given, give up quick.
 277                  */
 278                 if( trim( $this->mOname ) == '' || empty( $this->mUploadSize ) ) {
 279                         $this->mainUploadForm( wfMsgHtml( 'emptyfile' ) );
 280                         return;
 281                 }
 282
 283                 # Chop off any directories in the given filename
 284                 if( $this->mDestFile ) {
 285                         $basename = wfBaseName( $this->mDestFile );
 286                 } else {
 287                         $basename = wfBaseName( $this->mOname );
 288                 }
 289
 290                 /**
 291                  * We'll want to blacklist against *any* 'extension', and use
 292                  * only the final one for the whitelist.
 293                  */
 294                 list( $partname, $ext ) = $this->splitExtensions( $basename );
 295
 296                 if( count( $ext ) ) {
 297                         $finalExt = $ext[count( $ext ) - 1];
 298                 } else {
 299                         $finalExt = '';
 300                 }
 301                 $fullExt = implode( '.', $ext );
 302
 303                 # If there was more than one "extension", reassemble the base
 304                 # filename to prevent bogus complaints about length
 305                 if( count( $ext ) > 1 ) {
 306                         for( $i = 0; $i < count( $ext ) - 1; $i++ )
 307                                 $partname .= '.' . $ext[$i];
 308                 }
 309
 310                 if( strlen( $partname ) < 3 ) {
 311                         $this->mainUploadForm( wfMsgHtml( 'minlength' ) );
 312                         return;
 313                 }
 314
 315                 /**
 316                  * Filter out illegal characters, and try to make a legible name
 317                  * out of it. We'll strip some silently that Title would die on.
 318                  */
 319                 $filtered = preg_replace ( "/[^".Title::legalChars()."]|:/", '-', $basename );
 320                 $nt = Title::newFromText( $filtered );
 321                 if( is_null( $nt ) ) {
 322                         $this->uploadError( wfMsgWikiHtml( 'illegalfilename', htmlspecialchars( $filtered ) ) );
 323                         return;
 324                 }
 325                 $nt =& Title::makeTitle( NS_IMAGE, $nt->getDBkey() );
 326                 $this->mUploadSaveName = $nt->getDBkey();
 327
 328                 /**
 329                  * If the image is protected, non-sysop users won't be able
 330                  * to modify it by uploading a new revision.
 331                  */
 332                 if( !$nt->userCanEdit() ) {
 333                         return $this->uploadError( wfMsgWikiHtml( 'protectedpage' ) );
 334                 }
 335
 336                 /**
 337                  * In some cases we may forbid overwriting of existing files.
 338                  */
 339                 $overwrite = $this->checkOverwrite( $this->mUploadSaveName );
 340                 if( WikiError::isError( $overwrite ) ) {
 341                         return $this->uploadError( $overwrite->toString() );
 342                 }
 343
 344                 /* Don't allow users to override the blacklist (check file extension) */
 345                 global $wgStrictFileExtensions;
 346                 global $wgFileExtensions, $wgFileBlacklist;
 347                 if( $this->checkFileExtensionList( $ext, $wgFileBlacklist ) ||
 348                         ($wgStrictFileExtensions &&
 349                                 !$this->checkFileExtension( $finalExt, $wgFileExtensions ) ) ) {
 350                         return $this->uploadError( wfMsgHtml( 'badfiletype', htmlspecialchars( $fullExt ) ) );
 351                 }
 352
 353                 /**
 354                  * Look at the contents of the file; if we can recognize the
 355                  * type but it's corrupt or data of the wrong type, we should
 356                  * probably not accept it.
 357                  */
 358                 if( !$this->mStashed ) {
 359                         $this->checkMacBinary();
 360                         $veri = $this->verify( $this->mUploadTempName, $finalExt );
 361
 362                         if( $veri !== true ) { //it's a wiki error...
 363                                 return $this->uploadError( $veri->toString() );
 364                         }
 365                 }
 366
 367                 /**
 368                  * Provide an opportunity for extensions to add futher checks
 369                  */
 370                 $error = '';
 371                 if( !wfRunHooks( 'UploadVerification',
 372                                 array( $this->mUploadSaveName, $this->mUploadTempName, &$error ) ) ) {
 373                         return $this->uploadError( $error );
 374                 }
 375
 376                 /**
 377                  * Check for non-fatal conditions
 378                  */
 379                 if ( ! $this->mIgnoreWarning ) {
 380                         $warning = '';
 381
 382                         global $wgCapitalLinks;
 383                         if( $wgCapitalLinks ) {
 384                                 $filtered = ucfirst( $filtered );
 385                         }
 386                         if( $this->mUploadSaveName != $filtered ) {
 387                                 $warning .=  '<li>'.wfMsgHtml( 'badfilename', htmlspecialchars( $this->mUploadSaveName ) ).'</li>';
 388                         }
 389
 390                         global $wgCheckFileExtensions;
 391                         if ( $wgCheckFileExtensions ) {
 392                                 if ( ! $this->checkFileExtension( $finalExt, $wgFileExtensions ) ) {
 393                                         $warning .= '<li>'.wfMsgHtml( 'badfiletype', htmlspecialchars( $fullExt ) ).'</li>';
 394                                 }
 395                         }
 396
 397                         global $wgUploadSizeWarning;
 398                         if ( $wgUploadSizeWarning && ( $this->mUploadSize > $wgUploadSizeWarning ) ) {
 399                                 # TODO: Format $wgUploadSizeWarning to something that looks better than the raw byte
 400                                 # value, perhaps add GB,MB and KB suffixes?
 401                                 $warning .= '<li>'.wfMsgHtml( 'largefile', $wgUploadSizeWarning, $this->mUploadSize ).'</li>';
 402                         }
 403                         if ( $this->mUploadSize == 0 ) {
 404                                 $warning .= '<li>'.wfMsgHtml( 'emptyfile' ).'</li>';
 405                         }
 406
 407                         if( $nt->getArticleID() ) {
 408                                 global $wgUser;
 409                                 $sk = $wgUser->getSkin();
 410                                 $dlink = $sk->makeKnownLinkObj( $nt );
 411                                 $warning .= '<li>'.wfMsgHtml( 'fileexists', $dlink ).'</li>';
 412                         } else {
 413                                 # If the file existed before and was deleted, warn the user of this
 414                                 # Don't bother doing so if the image exists now, however
 415                                 $image = new Image( $nt );
 416                                 if( $image->wasDeleted() ) {
 417                                         $skin = $wgUser->getSkin();
 418                                         $ltitle = SpecialPage::getTitleFor( 'Log' );
 419                                         $llink = $skin->makeKnownLinkObj( $ltitle, wfMsgHtml( 'deletionlog' ), 'type=delete&page=' . $nt->getPrefixedUrl() );
 420                                         $warning .= wfOpenElement( 'li' ) . wfMsgWikiHtml( 'filewasdeleted', $llink ) . wfCloseElement( 'li' );
 421                                 }
 422                         }
 423
 424                         if( $warning != '' ) {
 425                                 /**
 426                                  * Stash the file in a temporary location; the user can choose
 427                                  * to let it through and we'll complete the upload then.
 428                                  */
 429                                 return $this->uploadWarning( $warning );
 430                         }
 431                 }
 432
 433                 /**
 434                  * Try actually saving the thing...
 435                  * It will show an error form on failure.
 436                  */
 437                 $hasBeenMunged = !empty( $this->mSessionKey ) || $this->mRemoveTempFile;
 438                 if( $this->saveUploadedFile( $this->mUploadSaveName,
 439                                              $this->mUploadTempName,
 440                                              $hasBeenMunged ) ) {
 441                         /**
 442                          * Update the upload log and create the description page
 443                          * if it's a new file.
 444                          */
 445                         $img = Image::newFromName( $this->mUploadSaveName );
 446                         $success = $img->recordUpload( $this->mUploadOldVersion,
 447                                                         $this->mUploadDescription,
 448                                                         $this->mLicense,
 449                                                         $this->mUploadCopyStatus,
 450                                                         $this->mUploadSource,
 451                                                         $this->mWatchthis );
 452
 453                         if ( $success ) {
 454                                 $this->showSuccess();
 455                                 wfRunHooks( 'UploadComplete', array( &$img ) );
 456                         } else {
 457                                 // Image::recordUpload() fails if the image went missing, which is
 458                                 // unlikely, hence the lack of a specialised message
 459                                 $wgOut->showFileNotFoundError( $this->mUploadSaveName );
 460                         }
 461                 }
 462         }
 463
 464         /**
 465          * Move the uploaded file from its temporary location to the final
 466          * destination. If a previous version of the file exists, move
 467          * it into the archive subdirectory.
 468          *
 469          * @todo If the later save fails, we may have disappeared the original file.
 470          *
 471          * @param string $saveName
 472          * @param string $tempName full path to the temporary file
 473          * @param bool $useRename if true, doesn't check that the source file
 474          *                        is a PHP-managed upload temporary
 475          */
 476         function saveUploadedFile( $saveName, $tempName, $useRename = false ) {
 477                 global $wgOut, $wgAllowCopyUploads;
 478
 479                 if ( !$useRename AND $wgAllowCopyUploads AND $this->mSourceType == 'web' ) $useRename = true;
 480
 481                 $fname= "SpecialUpload::saveUploadedFile";
 482
 483                 $dest = wfImageDir( $saveName );
 484                 $archive = wfImageArchiveDir( $saveName );
 485                 if ( !is_dir( $dest ) ) wfMkdirParents( $dest );
 486                 if ( !is_dir( $archive ) ) wfMkdirParents( $archive );
 487
 488                 $this->mSavedFile = "{$dest}/{$saveName}";
 489
 490                 if( is_file( $this->mSavedFile ) ) {
 491                         $this->mUploadOldVersion = gmdate( 'YmdHis' ) . "!{$saveName}";
 492                         wfSuppressWarnings();
 493                         $success = rename( $this->mSavedFile, "${archive}/{$this->mUploadOldVersion}" );
 494                         wfRestoreWarnings();
 495
 496                         if( ! $success ) {
 497                                 $wgOut->showFileRenameError( $this->mSavedFile,
 498                                   "${archive}/{$this->mUploadOldVersion}" );
 499                                 return false;
 500                         }
 501                         else wfDebug("$fname: moved file ".$this->mSavedFile." to ${archive}/{$this->mUploadOldVersion}\n");
 502                 }
 503                 else {
 504                         $this->mUploadOldVersion = '';
 505                 }
 506
 507                 wfSuppressWarnings();
 508                 $success = $useRename
 509                         ? rename( $tempName, $this->mSavedFile )
 510                         : move_uploaded_file( $tempName, $this->mSavedFile );
 511                 wfRestoreWarnings();
 512
 513                 if( ! $success ) {
 514                         $wgOut->showFileCopyError( $tempName, $this->mSavedFile );
 515                         return false;
 516                 } else {
 517                         wfDebug("$fname: wrote tempfile $tempName to ".$this->mSavedFile."\n");
 518                 }
 519
 520                 chmod( $this->mSavedFile, 0644 );
 521                 return true;
 522         }
 523
 524         /**
 525          * Stash a file in a temporary directory for later processing
 526          * after the user has confirmed it.
 527          *
 528          * If the user doesn't explicitly cancel or accept, these files
 529          * can accumulate in the temp directory.
 530          *
 531          * @param string $saveName - the destination filename
 532          * @param string $tempName - the source temporary file to save
 533          * @return string - full path the stashed file, or false on failure
 534          * @access private
 535          */
 536         function saveTempUploadedFile( $saveName, $tempName ) {
 537                 global $wgOut;
 538                 $archive = wfImageArchiveDir( $saveName, 'temp' );
 539                 if ( !is_dir ( $archive ) ) wfMkdirParents( $archive );
 540                 $stash = $archive . '/' . gmdate( "YmdHis" ) . '!' . $saveName;
 541
 542                 $success = $this->mRemoveTempFile
 543                         ? rename( $tempName, $stash )
 544                         : move_uploaded_file( $tempName, $stash );
 545                 if ( !$success ) {
 546                         $wgOut->showFileCopyError( $tempName, $stash );
 547                         return false;
 548                 }
 549
 550                 return $stash;
 551         }
 552
 553         /**
 554          * Stash a file in a temporary directory for later processing,
 555          * and save the necessary descriptive info into the session.
 556          * Returns a key value which will be passed through a form
 557          * to pick up the path info on a later invocation.
 558          *
 559          * @return int
 560          * @access private
 561          */
 562         function stashSession() {
 563                 $stash = $this->saveTempUploadedFile(
 564                         $this->mUploadSaveName, $this->mUploadTempName );
 565
 566                 if( !$stash ) {
 567                         # Couldn't save the file.
 568                         return false;
 569                 }
 570
 571                 $key = mt_rand( 0, 0x7fffffff );
 572                 $_SESSION['wsUploadData'][$key] = array(
 573                         'mUploadTempName' => $stash,
 574                         'mUploadSize'     => $this->mUploadSize,
 575                         'mOname'          => $this->mOname );
 576                 return $key;
 577         }
 578
 579         /**
 580          * Remove a temporarily kept file stashed by saveTempUploadedFile().
 581          * @access private
 582          * @return success
 583          */
 584         function unsaveUploadedFile() {
 585                 global $wgOut;
 586                 wfSuppressWarnings();
 587                 $success = unlink( $this->mUploadTempName );
 588                 wfRestoreWarnings();
 589                 if ( ! $success ) {
 590                         $wgOut->showFileDeleteError( $this->mUploadTempName );
 591                         return false;
 592                 } else {
 593                         return true;
 594                 }
 595         }
 596
 597         /* -------------------------------------------------------------- */
 598
 599         /**
 600          * Show some text and linkage on successful upload.
 601          * @access private
 602          */
 603         function showSuccess() {
 604                 global $wgUser, $wgOut, $wgContLang;
 605
 606                 $sk = $wgUser->getSkin();
 607                 $ilink = $sk->makeMediaLink( $this->mUploadSaveName, Image::imageUrl( $this->mUploadSaveName ) );
 608                 $dname = $wgContLang->getNsText( NS_IMAGE ) . ':'.$this->mUploadSaveName;
 609                 $dlink = $sk->makeKnownLink( $dname, $dname );
 610
 611                 $wgOut->addHTML( '<h2>' . wfMsgHtml( 'successfulupload' ) . "</h2>\n" );
 612                 $text = wfMsgWikiHtml( 'fileuploaded', $ilink, $dlink );
 613                 $wgOut->addHTML( $text );
 614                 $wgOut->returnToMain( false );
 615         }
 616
 617         /**
 618          * @param string $error as HTML
 619          * @access private
 620          */
 621         function uploadError( $error ) {
 622                 global $wgOut;
 623                 $wgOut->addHTML( "<h2>" . wfMsgHtml( 'uploadwarning' ) . "</h2>\n" );
 624                 $wgOut->addHTML( "<span class='error'>{$error}</span>\n" );
 625         }
 626
 627         /**
 628          * There's something wrong with this file, not enough to reject it
 629          * totally but we require manual intervention to save it for real.
 630          * Stash it away, then present a form asking to confirm or cancel.
 631          *
 632          * @param string $warning as HTML
 633          * @access private
 634          */
 635         function uploadWarning( $warning ) {
 636                 global $wgOut;
 637                 global $wgUseCopyrightUpload;
 638
 639                 $this->mSessionKey = $this->stashSession();
 640                 if( !$this->mSessionKey ) {
 641                         # Couldn't save file; an error has been displayed so let's go.
 642                         return;
 643                 }
 644
 645                 $wgOut->addHTML( "<h2>" . wfMsgHtml( 'uploadwarning' ) . "</h2>\n" );
 646                 $wgOut->addHTML( "<ul class='warning'>{$warning}</ul><br />\n" );
 647
 648                 $save = wfMsgHtml( 'savefile' );
 649                 $reupload = wfMsgHtml( 'reupload' );
 650                 $iw = wfMsgWikiHtml( 'ignorewarning' );
 651                 $reup = wfMsgWikiHtml( 'reuploaddesc' );
 652                 $titleObj = SpecialPage::getTitleFor( 'Upload' );
 653                 $action = $titleObj->escapeLocalURL( 'action=submit' );
 654
 655                 if ( $wgUseCopyrightUpload )
 656                 {
 657                         $copyright =  "
 658         <input type='hidden' name='wpUploadCopyStatus' value=\"" . htmlspecialchars( $this->mUploadCopyStatus ) . "\" />
 659         <input type='hidden' name='wpUploadSource' value=\"" . htmlspecialchars( $this->mUploadSource ) . "\" />
 660         ";
 661                 } else {
 662                         $copyright = "";
 663                 }
 664
 665                 $wgOut->addHTML( "
 666         <form id='uploadwarning' method='post' enctype='multipart/form-data' action='$action'>
 667                 <input type='hidden' name='wpIgnoreWarning' value='1' />
 668                 <input type='hidden' name='wpSessionKey' value=\"" . htmlspecialchars( $this->mSessionKey ) . "\" />
 669                 <input type='hidden' name='wpUploadDescription' value=\"" . htmlspecialchars( $this->mUploadDescription ) . "\" />
 670                 <input type='hidden' name='wpLicense' value=\"" . htmlspecialchars( $this->mLicense ) . "\" />
 671                 <input type='hidden' name='wpDestFile' value=\"" . htmlspecialchars( $this->mDestFile ) . "\" />
 672                 <input type='hidden' name='wpWatchthis' value=\"" . htmlspecialchars( intval( $this->mWatchthis ) ) . "\" />
 673         {$copyright}
 674         <table border='0'>
 675                 <tr>
 676                         <tr>
 677                                 <td align='right'>
 678                                         <input tabindex='2' type='submit' name='wpUpload' value=\"$save\" />
 679                                 </td>
 680                                 <td align='left'>$iw</td>
 681                         </tr>
 682                         <tr>
 683                                 <td align='right'>
 684                                         <input tabindex='2' type='submit' name='wpReUpload' value=\"{$reupload}\" />
 685                                 </td>
 686                                 <td align='left'>$reup</td>
 687                         </tr>
 688                 </tr>
 689         </table></form>\n" );
 690         }
 691
 692         /**
 693          * Displays the main upload form, optionally with a highlighted
 694          * error message up at the top.
 695          *
 696          * @param string $msg as HTML
 697          * @access private
 698          */
 699         function mainUploadForm( $msg='' ) {
 700                 global $wgOut, $wgUser;
 701                 global $wgUseCopyrightUpload;
 702                 global $wgRequest, $wgAllowCopyUploads;
 703
 704          if( !wfRunHooks( 'UploadForm:initial', array( &$this ) ) )
 705          {
 706           wfDebug( "Hook 'UploadForm:initial' broke output of the upload form" );
 707           return false;
 708          }
 709
 710                 $cols = intval($wgUser->getOption( 'cols' ));
 711                 $ew = $wgUser->getOption( 'editwidth' );
 712                 if ( $ew ) $ew = " style=\"width:100%\"";
 713                 else $ew = '';
 714
 715                 if ( '' != $msg ) {
 716                         $sub = wfMsgHtml( 'uploaderror' );
 717                         $wgOut->addHTML( "<h2>{$sub}</h2>\n" .
 718                           "<span class='error'>{$msg}</span>\n" );
 719                 }
 720                 $wgOut->addHTML( '<div id="uploadtext">' );
 721                 $wgOut->addWikiText( wfMsg( 'uploadtext' ) );
 722                 $wgOut->addHTML( '</div>' );
 723
 724                 $sourcefilename = wfMsgHtml( 'sourcefilename' );
 725                 $destfilename = wfMsgHtml( 'destfilename' );
 726                 $summary = wfMsgWikiHtml( 'fileuploadsummary' );
 727
 728                 $licenses = new Licenses();
 729                 $license = wfMsgHtml( 'license' );
 730                 $nolicense = wfMsgHtml( 'nolicense' );
 731                 $licenseshtml = $licenses->getHtml();
 732
 733                 $ulb = wfMsgHtml( 'uploadbtn' );
 734
 735
 736                 $titleObj = SpecialPage::getTitleFor( 'Upload' );
 737                 $action = $titleObj->escapeLocalURL();
 738
 739                 $encDestFile = htmlspecialchars( $this->mDestFile );
 740
 741                 $watchChecked =
 742                         ( $wgUser->getOption( 'watchdefault' ) ||
 743                                 ( $wgUser->getOption( 'watchcreations' ) && $this->mDestFile == '' ) )
 744                         ? 'checked="checked"'
 745                         : '';
 746
 747                 // Prepare form for upload or upload/copy
 748                 if( $wgAllowCopyUploads && $wgUser->isAllowed( 'upload_by_url' ) ) {
 749                         $filename_form =
 750                                 "<input type='radio' id='wpSourceTypeFile' name='wpSourceType' value='file' onchange='toggle_element_activation(\"wpUploadFileURL\",\"wpUploadFile\")' checked />" .
 751                                 "<input tabindex='1' type='file' name='wpUploadFile' id='wpUploadFile' onfocus='toggle_element_activation(\"wpUploadFileURL\",\"wpUploadFile\");toggle_element_check(\"wpSourceTypeFile\",\"wpSourceTypeURL\")'" .
 752                                 ($this->mDestFile?"":"onchange='fillDestFilename(\"wpUploadFile\")' ") . "size='40' />" .
 753                                 wfMsgHTML( 'upload_source_file' ) . "<br/>" .
 754                                 "<input type='radio' id='wpSourceTypeURL' name='wpSourceType' value='web' onchange='toggle_element_activation(\"wpUploadFile\",\"wpUploadFileURL\")' />" .
 755                                 "<input tabindex='1' type='text' name='wpUploadFileURL' id='wpUploadFileURL' onfocus='toggle_element_activation(\"wpUploadFile\",\"wpUploadFileURL\");toggle_element_check(\"wpSourceTypeURL\",\"wpSourceTypeFile\")'" .
 756                                 ($this->mDestFile?"":"onchange='fillDestFilename(\"wpUploadFileURL\")' ") . "size='40' DISABLED />" .
 757                                 wfMsgHtml( 'upload_source_url' ) ;
 758                 } else {
 759                         $filename_form =
 760                                 "<input tabindex='1' type='file' name='wpUploadFile' id='wpUploadFile' " .
 761                                 ($this->mDestFile?"":"onchange='fillDestFilename(\"wpUploadFile\")' ") .
 762                                 "size='40' />" .
 763                                 "<input type='hidden' name='wpSourceType' value='file' />" ;
 764                 }
 765
 766                 $wgOut->addHTML( "
 767         <form id='upload' method='post' enctype='multipart/form-data' action=\"$action\">
 768                 <table border='0'>
 769                 <tr>
 770           {$this->uploadFormTextTop}
 771                         <td align='right' valign='top'><label for='wpUploadFile'>{$sourcefilename}:</label></td>
 772                         <td align='left'>
 773                                 {$filename_form}
 774                         </td>
 775                 </tr>
 776                 <tr>
 777                         <td align='right'><label for='wpDestFile'>{$destfilename}:</label></td>
 778                         <td align='left'>
 779                                 <input tabindex='2' type='text' name='wpDestFile' id='wpDestFile' size='40' value=\"$encDestFile\" />
 780                         </td>
 781                 </tr>
 782                 <tr>
 783                         <td align='right'><label for='wpUploadDescription'>{$summary}</label></td>
 784                         <td align='left'>
 785                                 <textarea tabindex='3' name='wpUploadDescription' id='wpUploadDescription' rows='6' cols='{$cols}'{$ew}>" . htmlspecialchars( $this->mUploadDescription ) . "</textarea>
 786            {$this->uploadFormTextAfterSummary}
 787                         </td>
 788                 </tr>
 789                 <tr>" );
 790
 791                 if ( $licenseshtml != '' ) {
 792                         global $wgStylePath;
 793                         $wgOut->addHTML( "
 794                         <td align='right'><label for='wpLicense'>$license:</label></td>
 795                         <td align='left'>
 796                                 <script type='text/javascript' src=\"$wgStylePath/common/upload.js\"></script>
 797                                 <select name='wpLicense' id='wpLicense' tabindex='4'
 798                                         onchange='licenseSelectorCheck()'>
 799                                         <option value=''>$nolicense</option>
 800                                         $licenseshtml
 801                                 </select>
 802                         </td>
 803                         </tr>
 804                         <tr>
 805                 ");
 806                 }
 807
 808                 if ( $wgUseCopyrightUpload ) {
 809                         $filestatus = wfMsgHtml ( 'filestatus' );
 810                         $copystatus =  htmlspecialchars( $this->mUploadCopyStatus );
 811                         $filesource = wfMsgHtml ( 'filesource' );
 812                         $uploadsource = htmlspecialchars( $this->mUploadSource );
 813
 814                         $wgOut->addHTML( "
 815                                 <td align='right' nowrap='nowrap'><label for='wpUploadCopyStatus'>$filestatus:</label></td>
 816                                 <td><input tabindex='5' type='text' name='wpUploadCopyStatus' id='wpUploadCopyStatus' value=\"$copystatus\" size='40' /></td>
 817                         </tr>
 818                         <tr>
 819                                 <td align='right'><label for='wpUploadCopyStatus'>$filesource:</label></td>
 820                                 <td><input tabindex='6' type='text' name='wpUploadSource' id='wpUploadCopyStatus' value=\"$uploadsource\" size='40' /></td>
 821                         </tr>
 822                         <tr>
 823                 ");
 824                 }
 825
 826
 827                 $wgOut->addHtml( "
 828                 <td></td>
 829                 <td>
 830                         <input tabindex='7' type='checkbox' name='wpWatchthis' id='wpWatchthis' $watchChecked value='true' />
 831                         <label for='wpWatchthis'>" . wfMsgHtml( 'watchthisupload' ) . "</label>
 832                         <input tabindex='8' type='checkbox' name='wpIgnoreWarning' id='wpIgnoreWarning' value='true' />
 833                         <label for='wpIgnoreWarning'>" . wfMsgHtml( 'ignorewarnings' ) . "</label>
 834                 </td>
 835         </tr>
 836         <tr>
 837
 838         </tr>
 839         <tr>
 840                 <td></td>
 841                 <td align='left'><input tabindex='9' type='submit' name='wpUpload' value=\"{$ulb}\" /></td>
 842         </tr>
 843
 844         <tr>
 845                 <td></td>
 846                 <td align='left'>
 847                 " );
 848                 $wgOut->addWikiText( wfMsgForContent( 'edittools' ) );
 849                 $wgOut->addHTML( "
 850                 </td>
 851         </tr>
 852
 853         </table>
 854         </form>" );
 855         }
 856
 857         /* -------------------------------------------------------------- */
 858
 859         /**
 860          * Split a file into a base name and all dot-delimited 'extensions'
 861          * on the end. Some web server configurations will fall back to
 862          * earlier pseudo-'extensions' to determine type and execute
 863          * scripts, so the blacklist needs to check them all.
 864          *
 865          * @return array
 866          */
 867         function splitExtensions( $filename ) {
 868                 $bits = explode( '.', $filename );
 869                 $basename = array_shift( $bits );
 870                 return array( $basename, $bits );
 871         }
 872
 873         /**
 874          * Perform case-insensitive match against a list of file extensions.
 875          * Returns true if the extension is in the list.
 876          *
 877          * @param string $ext
 878          * @param array $list
 879          * @return bool
 880          */
 881         function checkFileExtension( $ext, $list ) {
 882                 return in_array( strtolower( $ext ), $list );
 883         }
 884
 885         /**
 886          * Perform case-insensitive match against a list of file extensions.
 887          * Returns true if any of the extensions are in the list.
 888          *
 889          * @param array $ext
 890          * @param array $list
 891          * @return bool
 892          */
 893         function checkFileExtensionList( $ext, $list ) {
 894                 foreach( $ext as $e ) {
 895                         if( in_array( strtolower( $e ), $list ) ) {
 896                                 return true;
 897                         }
 898                 }
 899                 return false;
 900         }
 901
 902         /**
 903          * Verifies that it's ok to include the uploaded file
 904          *
 905          * @param string $tmpfile the full path of the temporary file to verify
 906          * @param string $extension The filename extension that the file is to be served with
 907          * @return mixed true of the file is verified, a WikiError object otherwise.
 908          */
 909         function verify( $tmpfile, $extension ) {
 910                 #magically determine mime type
 911                 $magic=& MimeMagic::singleton();
 912                 $mime= $magic->guessMimeType($tmpfile,false);
 913
 914                 $fname= "SpecialUpload::verify";
 915
 916                 #check mime type, if desired
 917                 global $wgVerifyMimeType;
 918                 if ($wgVerifyMimeType) {
 919
 920                         #check mime type against file extension
 921                         if( !$this->verifyExtension( $mime, $extension ) ) {
 922                                 return new WikiErrorMsg( 'uploadcorrupt' );
 923                         }
 924
 925                         #check mime type blacklist
 926                         global $wgMimeTypeBlacklist;
 927                         if( isset($wgMimeTypeBlacklist) && !is_null($wgMimeTypeBlacklist)
 928                                 && $this->checkFileExtension( $mime, $wgMimeTypeBlacklist ) ) {
 929                                 return new WikiErrorMsg( 'badfiletype', htmlspecialchars( $mime ) );
 930                         }
 931                 }
 932
 933                 #check for htmlish code and javascript
 934                 if( $this->detectScript ( $tmpfile, $mime, $extension ) ) {
 935                         return new WikiErrorMsg( 'uploadscripted' );
 936                 }
 937
 938                 /**
 939                 * Scan the uploaded file for viruses
 940                 */
 941                 $virus= $this->detectVirus($tmpfile);
 942                 if ( $virus ) {
 943                         return new WikiErrorMsg( 'uploadvirus', htmlspecialchars($virus) );
 944                 }
 945
 946                 wfDebug( "$fname: all clear; passing.\n" );
 947                 return true;
 948         }
 949
 950         /**
 951          * Checks if the mime type of the uploaded file matches the file extension.
 952          *
 953          * @param string $mime the mime type of the uploaded file
 954          * @param string $extension The filename extension that the file is to be served with
 955          * @return bool
 956          */
 957         function verifyExtension( $mime, $extension ) {
 958                 $fname = 'SpecialUpload::verifyExtension';
 959
 960                 $magic =& MimeMagic::singleton();
 961
 962                 if ( ! $mime || $mime == 'unknown' || $mime == 'unknown/unknown' )
 963                         if ( ! $magic->isRecognizableExtension( $extension ) ) {
 964                                 wfDebug( "$fname: passing file with unknown detected mime type; unrecognized extension '$extension', can't verify\n" );
 965                                 return true;
 966                         } else {
 967                                 wfDebug( "$fname: rejecting file with unknown detected mime type; recognized extension '$extension', so probably invalid file\n" );
 968                                 return false;
 969                         }
 970
 971                 $match= $magic->isMatchingExtension($extension,$mime);
 972
 973                 if ($match===NULL) {
 974                         wfDebug( "$fname: no file extension known for mime type $mime, passing file\n" );
 975                         return true;
 976                 } elseif ($match===true) {
 977                         wfDebug( "$fname: mime type $mime matches extension $extension, passing file\n" );
 978
 979                         #TODO: if it's a bitmap, make sure PHP or ImageMagic resp. can handle it!
 980                         return true;
 981
 982                 } else {
 983                         wfDebug( "$fname: mime type $mime mismatches file extension $extension, rejecting file\n" );
 984                         return false;
 985                 }
 986         }
 987
 988         /** Heuristig for detecting files that *could* contain JavaScript instructions or
 989         * things that may look like HTML to a browser and are thus
 990         * potentially harmful. The present implementation will produce false positives in some situations.
 991         *
 992         * @param string $file Pathname to the temporary upload file
 993         * @param string $mime The mime type of the file
 994         * @param string $extension The extension of the file
 995         * @return bool true if the file contains something looking like embedded scripts
 996         */
 997         function detectScript($file, $mime, $extension) {
 998                 global $wgAllowTitlesInSVG;
 999
1000                 #ugly hack: for text files, always look at the entire file.
1001                 #For binarie field, just check the first K.
1002
1003                 if (strpos($mime,'text/')===0) $chunk = file_get_contents( $file );
1004                 else {
1005                         $fp = fopen( $file, 'rb' );
1006                         $chunk = fread( $fp, 1024 );
1007                         fclose( $fp );
1008                 }
1009
1010                 $chunk= strtolower( $chunk );
1011
1012                 if (!$chunk) return false;
1013
1014                 #decode from UTF-16 if needed (could be used for obfuscation).
1015                 if (substr($chunk,0,2)=="\xfe\xff") $enc= "UTF-16BE";
1016                 elseif (substr($chunk,0,2)=="\xff\xfe") $enc= "UTF-16LE";
1017                 else $enc= NULL;
1018
1019                 if ($enc) $chunk= iconv($enc,"ASCII//IGNORE",$chunk);
1020
1021                 $chunk= trim($chunk);
1022
1023                 #FIXME: convert from UTF-16 if necessarry!
1024
1025                 wfDebug("SpecialUpload::detectScript: checking for embedded scripts and HTML stuff\n");
1026
1027                 #check for HTML doctype
1028                 if (eregi("<!DOCTYPE *X?HTML",$chunk)) return true;
1029
1030                 /**
1031                 * Internet Explorer for Windows performs some really stupid file type
1032                 * autodetection which can cause it to interpret valid image files as HTML
1033                 * and potentially execute JavaScript, creating a cross-site scripting
1034                 * attack vectors.
1035                 *
1036                 * Apple's Safari browser also performs some unsafe file type autodetection
1037                 * which can cause legitimate files to be interpreted as HTML if the
1038                 * web server is not correctly configured to send the right content-type
1039                 * (or if you're really uploading plain text and octet streams!)
1040                 *
1041                 * Returns true if IE is likely to mistake the given file for HTML.
1042                 * Also returns true if Safari would mistake the given file for HTML
1043                 * when served with a generic content-type.
1044                 */
1045
1046                 $tags = array(
1047                         '<body',
1048                         '<head',
1049                         '<html',   #also in safari
1050                         '<img',
1051                         '<pre',
1052                         '<script', #also in safari
1053                         '<table'
1054                         );
1055                 if( ! $wgAllowTitlesInSVG && $extension !== 'svg' && $mime !== 'image/svg' ) {
1056                         $tags[] = '<title';
1057                 }
1058
1059                 foreach( $tags as $tag ) {
1060                         if( false !== strpos( $chunk, $tag ) ) {
1061                                 return true;
1062                         }
1063                 }
1064
1065                 /*
1066                 * look for javascript
1067                 */
1068
1069                 #resolve entity-refs to look at attributes. may be harsh on big files... cache result?
1070                 $chunk = Sanitizer::decodeCharReferences( $chunk );
1071
1072                 #look for script-types
1073                 if (preg_match('!type\s*=\s*[\'"]?\s*(\w*/)?(ecma|java)!sim',$chunk)) return true;
1074
1075                 #look for html-style script-urls
1076                 if (preg_match('!(href|src|data)\s*=\s*[\'"]?\s*(ecma|java)script:!sim',$chunk)) return true;
1077
1078                 #look for css-style script-urls
1079                 if (preg_match('!url\s*\(\s*[\'"]?\s*(ecma|java)script:!sim',$chunk)) return true;
1080
1081                 wfDebug("SpecialUpload::detectScript: no scripts found\n");
1082                 return false;
1083         }
1084
1085         /** Generic wrapper function for a virus scanner program.
1086         * This relies on the $wgAntivirus and $wgAntivirusSetup variables.
1087         * $wgAntivirusRequired may be used to deny upload if the scan fails.
1088         *
1089         * @param string $file Pathname to the temporary upload file
1090         * @return mixed false if not virus is found, NULL if the scan fails or is disabled,
1091         *         or a string containing feedback from the virus scanner if a virus was found.
1092         *         If textual feedback is missing but a virus was found, this function returns true.
1093         */
1094         function detectVirus($file) {
1095                 global $wgAntivirus, $wgAntivirusSetup, $wgAntivirusRequired, $wgOut;
1096
1097                 $fname= "SpecialUpload::detectVirus";
1098
1099                 if (!$wgAntivirus) { #disabled?
1100                         wfDebug("$fname: virus scanner disabled\n");
1101
1102                         return NULL;
1103                 }
1104
1105                 if (!$wgAntivirusSetup[$wgAntivirus]) {
1106                         wfDebug("$fname: unknown virus scanner: $wgAntivirus\n");
1107
1108                         $wgOut->addHTML( "<div class='error'>Bad configuration: unknown virus scanner: <i>$wgAntivirus</i></div>\n" ); #LOCALIZE
1109
1110                         return "unknown antivirus: $wgAntivirus";
1111                 }
1112
1113                 #look up scanner configuration
1114                 $virus_scanner= $wgAntivirusSetup[$wgAntivirus]["command"]; #command pattern
1115                 $virus_scanner_codes= $wgAntivirusSetup[$wgAntivirus]["codemap"]; #exit-code map
1116                 $msg_pattern= $wgAntivirusSetup[$wgAntivirus]["messagepattern"]; #message pattern
1117
1118                 $scanner= $virus_scanner; #copy, so we can resolve the pattern
1119
1120                 if (strpos($scanner,"%f")===false) $scanner.= " ".wfEscapeShellArg($file); #simple pattern: append file to scan
1121                 else $scanner= str_replace("%f",wfEscapeShellArg($file),$scanner); #complex pattern: replace "%f" with file to scan
1122
1123                 wfDebug("$fname: running virus scan: $scanner \n");
1124
1125                 #execute virus scanner
1126                 $code= false;
1127
1128                 #NOTE: there's a 50 line workaround to make stderr redirection work on windows, too.
1129                 #      that does not seem to be worth the pain.
1130                 #      Ask me (Duesentrieb) about it if it's ever needed.
1131                 $output = array();
1132                 if (wfIsWindows()) exec("$scanner",$output,$code);
1133                 else exec("$scanner 2>&1",$output,$code);
1134
1135                 $exit_code= $code; #remember for user feedback
1136
1137                 if ($virus_scanner_codes) { #map exit code to AV_xxx constants.
1138                         if (isset($virus_scanner_codes[$code])) {
1139                                 $code= $virus_scanner_codes[$code]; # explicit mapping
1140                         } else if (isset($virus_scanner_codes["*"])) {
1141                                 $code= $virus_scanner_codes["*"];   # fallback mapping
1142                         }
1143                 }
1144
1145                 if ($code===AV_SCAN_FAILED) { #scan failed (code was mapped to false by $virus_scanner_codes)
1146                         wfDebug("$fname: failed to scan $file (code $exit_code).\n");
1147
1148                         if ($wgAntivirusRequired) { return "scan failed (code $exit_code)"; }
1149                         else { return NULL; }
1150                 }
1151                 else if ($code===AV_SCAN_ABORTED) { #scan failed because filetype is unknown (probably imune)
1152                         wfDebug("$fname: unsupported file type $file (code $exit_code).\n");
1153                         return NULL;
1154                 }
1155                 else if ($code===AV_NO_VIRUS) {
1156                         wfDebug("$fname: file passed virus scan.\n");
1157                         return false; #no virus found
1158                 }
1159                 else {
1160                         $output= join("\n",$output);
1161                         $output= trim($output);
1162
1163                         if (!$output) $output= true; #if there's no output, return true
1164                         else if ($msg_pattern) {
1165                                 $groups= array();
1166                                 if (preg_match($msg_pattern,$output,$groups)) {
1167                                         if ($groups[1]) $output= $groups[1];
1168                                 }
1169                         }
1170
1171                         wfDebug("$fname: FOUND VIRUS! scanner feedback: $output");
1172                         return $output;
1173                 }
1174         }
1175
1176         /**
1177          * Check if the temporary file is MacBinary-encoded, as some uploads
1178          * from Internet Explorer on Mac OS Classic and Mac OS X will be.
1179          * If so, the data fork will be extracted to a second temporary file,
1180          * which will then be checked for validity and either kept or discarded.
1181          *
1182          * @access private
1183          */
1184         function checkMacBinary() {
1185                 $macbin = new MacBinary( $this->mUploadTempName );
1186                 if( $macbin->isValid() ) {
1187                         $dataFile = tempnam( wfTempDir(), "WikiMacBinary" );
1188                         $dataHandle = fopen( $dataFile, 'wb' );
1189
1190                         wfDebug( "SpecialUpload::checkMacBinary: Extracting MacBinary data fork to $dataFile\n" );
1191                         $macbin->extractData( $dataHandle );
1192
1193                         $this->mUploadTempName = $dataFile;
1194                         $this->mUploadSize = $macbin->dataForkLength();
1195
1196                         // We'll have to manually remove the new file if it's not kept.
1197                         $this->mRemoveTempFile = true;
1198                 }
1199                 $macbin->close();
1200         }
1201
1202         /**
1203          * If we've modified the upload file we need to manually remove it
1204          * on exit to clean up.
1205          * @access private
1206          */
1207         function cleanupTempFile() {
1208                 if( $this->mRemoveTempFile && file_exists( $this->mUploadTempName ) ) {
1209                         wfDebug( "SpecialUpload::cleanupTempFile: Removing temporary file $this->mUploadTempName\n" );
1210                         unlink( $this->mUploadTempName );
1211                 }
1212         }
1213
1214         /**
1215          * Check if there's an overwrite conflict and, if so, if restrictions
1216          * forbid this user from performing the upload.
1217          *
1218          * @return mixed true on success, WikiError on failure
1219          * @access private
1220          */
1221         function checkOverwrite( $name ) {
1222                 $img = Image::newFromName( $name );
1223                 if( is_null( $img ) ) {
1224                         // Uh... this shouldn't happen ;)
1225                         // But if it does, fall through to previous behavior
1226                         return false;
1227                 }
1228
1229                 $error = '';
1230                 if( $img->exists() ) {
1231                         global $wgUser, $wgOut;
1232                         if( $img->isLocal() ) {
1233                                 if( !$wgUser->isAllowed( 'reupload' ) ) {
1234                                         $error = 'fileexists-forbidden';
1235                                 }
1236                         } else {
1237                                 if( !$wgUser->isAllowed( 'reupload' ) ||
1238                                     !$wgUser->isAllowed( 'reupload-shared' ) ) {
1239                                         $error = "fileexists-shared-forbidden";
1240                                 }
1241                         }
1242                 }
1243
1244                 if( $error ) {
1245                         $errorText = wfMsg( $error, wfEscapeWikiText( $img->getName() ) );
1246                         return new WikiError( $wgOut->parse( $errorText ) );
1247                 }
1248
1249                 // Rockin', go ahead and upload
1250                 return true;
1251         }
1252
1253 }
1254
1255
1256 ?>