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, $wgOut;
 268
 269                 if( !wfRunHooks( 'UploadForm:BeforeProcessing', array( &$this ) ) )
 270                 {
 271                         wfDebug( "Hook 'UploadForm:BeforeProcessing' broke processing the file." );
 272                         return false;
 273                 }
 274
 275                 /* Check for PHP error if any, requires php 4.2 or newer */
 276                 if( $this->mUploadError == 1/*UPLOAD_ERR_INI_SIZE*/ ) {
 277                         $this->mainUploadForm( wfMsgHtml( 'largefileserver' ) );
 278                         return;
 279                 }
 280
 281                 /**
 282                  * If there was no filename or a zero size given, give up quick.
 283                  */
 284                 if( trim( $this->mOname ) == '' || empty( $this->mUploadSize ) ) {
 285                         $this->mainUploadForm( wfMsgHtml( 'emptyfile' ) );
 286                         return;
 287                 }
 288
 289                 # Chop off any directories in the given filename
 290                 if( $this->mDestFile ) {
 291                         $basename = wfBaseName( $this->mDestFile );
 292                 } else {
 293                         $basename = wfBaseName( $this->mOname );
 294                 }
 295
 296                 /**
 297                  * We'll want to blacklist against *any* 'extension', and use
 298                  * only the final one for the whitelist.
 299                  */
 300                 list( $partname, $ext ) = $this->splitExtensions( $basename );
 301
 302                 if( count( $ext ) ) {
 303                         $finalExt = $ext[count( $ext ) - 1];
 304                 } else {
 305                         $finalExt = '';
 306                 }
 307                 $fullExt = implode( '.', $ext );
 308
 309                 # If there was more than one "extension", reassemble the base
 310                 # filename to prevent bogus complaints about length
 311                 if( count( $ext ) > 1 ) {
 312                         for( $i = 0; $i < count( $ext ) - 1; $i++ )
 313                                 $partname .= '.' . $ext[$i];
 314                 }
 315
 316                 if( strlen( $partname ) < 3 ) {
 317                         $this->mainUploadForm( wfMsgHtml( 'minlength' ) );
 318                         return;
 319                 }
 320
 321                 /**
 322                  * Filter out illegal characters, and try to make a legible name
 323                  * out of it. We'll strip some silently that Title would die on.
 324                  */
 325                 $filtered = preg_replace ( "/[^".Title::legalChars()."]|:/", '-', $basename );
 326                 $nt = Title::newFromText( $filtered );
 327                 if( is_null( $nt ) ) {
 328                         $this->uploadError( wfMsgWikiHtml( 'illegalfilename', htmlspecialchars( $filtered ) ) );
 329                         return;
 330                 }
 331                 $nt =& Title::makeTitle( NS_IMAGE, $nt->getDBkey() );
 332                 $this->mUploadSaveName = $nt->getDBkey();
 333
 334                 /**
 335                  * If the image is protected, non-sysop users won't be able
 336                  * to modify it by uploading a new revision.
 337                  */
 338                 if( !$nt->userCanEdit() ) {
 339                         return $this->uploadError( wfMsgWikiHtml( 'protectedpage' ) );
 340                 }
 341
 342                 /**
 343                  * In some cases we may forbid overwriting of existing files.
 344                  */
 345                 $overwrite = $this->checkOverwrite( $this->mUploadSaveName );
 346                 if( WikiError::isError( $overwrite ) ) {
 347                         return $this->uploadError( $overwrite->toString() );
 348                 }
 349
 350                 /* Don't allow users to override the blacklist (check file extension) */
 351                 global $wgStrictFileExtensions;
 352                 global $wgFileExtensions, $wgFileBlacklist;
 353                 if( $this->checkFileExtensionList( $ext, $wgFileBlacklist ) ||
 354                         ($wgStrictFileExtensions &&
 355                                 !$this->checkFileExtension( $finalExt, $wgFileExtensions ) ) ) {
 356                         return $this->uploadError( wfMsgHtml( 'badfiletype', htmlspecialchars( $fullExt ) ) );
 357                 }
 358
 359                 /**
 360                  * Look at the contents of the file; if we can recognize the
 361                  * type but it's corrupt or data of the wrong type, we should
 362                  * probably not accept it.
 363                  */
 364                 if( !$this->mStashed ) {
 365                         $this->checkMacBinary();
 366                         $veri = $this->verify( $this->mUploadTempName, $finalExt );
 367
 368                         if( $veri !== true ) { //it's a wiki error...
 369                                 return $this->uploadError( $veri->toString() );
 370                         }
 371                 }
 372
 373                 /**
 374                  * Provide an opportunity for extensions to add futher checks
 375                  */
 376                 $error = '';
 377                 if( !wfRunHooks( 'UploadVerification',
 378                                 array( $this->mUploadSaveName, $this->mUploadTempName, &$error ) ) ) {
 379                         return $this->uploadError( $error );
 380                 }
 381
 382                 /**
 383                  * Check for non-fatal conditions
 384                  */
 385                 if ( ! $this->mIgnoreWarning ) {
 386                         $warning = '';
 387
 388                         global $wgCapitalLinks;
 389                         if( $wgCapitalLinks ) {
 390                                 $filtered = ucfirst( $filtered );
 391                         }
 392                         if( $this->mUploadSaveName != $filtered ) {
 393                                 $warning .=  '<li>'.wfMsgHtml( 'badfilename', htmlspecialchars( $this->mUploadSaveName ) ).'</li>';
 394                         }
 395
 396                         global $wgCheckFileExtensions;
 397                         if ( $wgCheckFileExtensions ) {
 398                                 if ( ! $this->checkFileExtension( $finalExt, $wgFileExtensions ) ) {
 399                                         $warning .= '<li>'.wfMsgHtml( 'badfiletype', htmlspecialchars( $fullExt ) ).'</li>';
 400                                 }
 401                         }
 402
 403                         global $wgUploadSizeWarning;
 404                         if ( $wgUploadSizeWarning && ( $this->mUploadSize > $wgUploadSizeWarning ) ) {
 405                                 # TODO: Format $wgUploadSizeWarning to something that looks better than the raw byte
 406                                 # value, perhaps add GB,MB and KB suffixes?
 407                                 $warning .= '<li>'.wfMsgHtml( 'largefile', $wgUploadSizeWarning, $this->mUploadSize ).'</li>';
 408                         }
 409                         if ( $this->mUploadSize == 0 ) {
 410                                 $warning .= '<li>'.wfMsgHtml( 'emptyfile' ).'</li>';
 411                         }
 412
 413                         if( $nt->getArticleID() ) {
 414                                 global $wgUser;
 415                                 $sk = $wgUser->getSkin();
 416                                 $dlink = $sk->makeKnownLinkObj( $nt );
 417                                 $warning .= '<li>'.wfMsgHtml( 'fileexists', $dlink ).'</li>';
 418                         } else {
 419                                 # If the file existed before and was deleted, warn the user of this
 420                                 # Don't bother doing so if the image exists now, however
 421                                 $image = new Image( $nt );
 422                                 if( $image->wasDeleted() ) {
 423                                         $skin = $wgUser->getSkin();
 424                                         $ltitle = SpecialPage::getTitleFor( 'Log' );
 425                                         $llink = $skin->makeKnownLinkObj( $ltitle, wfMsgHtml( 'deletionlog' ), 'type=delete&page=' . $nt->getPrefixedUrl() );
 426                                         $warning .= wfOpenElement( 'li' ) . wfMsgWikiHtml( 'filewasdeleted', $llink ) . wfCloseElement( 'li' );
 427                                 }
 428                         }
 429
 430                         if( $warning != '' ) {
 431                                 /**
 432                                  * Stash the file in a temporary location; the user can choose
 433                                  * to let it through and we'll complete the upload then.
 434                                  */
 435                                 return $this->uploadWarning( $warning );
 436                         }
 437                 }
 438
 439                 /**
 440                  * Try actually saving the thing...
 441                  * It will show an error form on failure.
 442                  */
 443                 $hasBeenMunged = !empty( $this->mSessionKey ) || $this->mRemoveTempFile;
 444                 if( $this->saveUploadedFile( $this->mUploadSaveName,
 445                                              $this->mUploadTempName,
 446                                              $hasBeenMunged ) ) {
 447                         /**
 448                          * Update the upload log and create the description page
 449                          * if it's a new file.
 450                          */
 451                         $img = Image::newFromName( $this->mUploadSaveName );
 452                         $success = $img->recordUpload( $this->mUploadOldVersion,
 453                                                         $this->mUploadDescription,
 454                                                         $this->mLicense,
 455                                                         $this->mUploadCopyStatus,
 456                                                         $this->mUploadSource,
 457                                                         $this->mWatchthis );
 458
 459                         if ( $success ) {
 460                                 $this->showSuccess();
 461                                 wfRunHooks( 'UploadComplete', array( &$img ) );
 462                         } else {
 463                                 // Image::recordUpload() fails if the image went missing, which is
 464                                 // unlikely, hence the lack of a specialised message
 465                                 $wgOut->showFileNotFoundError( $this->mUploadSaveName );
 466                         }
 467                 }
 468         }
 469
 470         /**
 471          * Move the uploaded file from its temporary location to the final
 472          * destination. If a previous version of the file exists, move
 473          * it into the archive subdirectory.
 474          *
 475          * @todo If the later save fails, we may have disappeared the original file.
 476          *
 477          * @param string $saveName
 478          * @param string $tempName full path to the temporary file
 479          * @param bool $useRename if true, doesn't check that the source file
 480          *                        is a PHP-managed upload temporary
 481          */
 482         function saveUploadedFile( $saveName, $tempName, $useRename = false ) {
 483                 global $wgOut, $wgAllowCopyUploads;
 484
 485                 if ( !$useRename AND $wgAllowCopyUploads AND $this->mSourceType == 'web' ) $useRename = true;
 486
 487                 $fname= "SpecialUpload::saveUploadedFile";
 488
 489                 $dest = wfImageDir( $saveName );
 490                 $archive = wfImageArchiveDir( $saveName );
 491                 if ( !is_dir( $dest ) ) wfMkdirParents( $dest );
 492                 if ( !is_dir( $archive ) ) wfMkdirParents( $archive );
 493
 494                 $this->mSavedFile = "{$dest}/{$saveName}";
 495
 496                 if( is_file( $this->mSavedFile ) ) {
 497                         $this->mUploadOldVersion = gmdate( 'YmdHis' ) . "!{$saveName}";
 498                         wfSuppressWarnings();
 499                         $success = rename( $this->mSavedFile, "${archive}/{$this->mUploadOldVersion}" );
 500                         wfRestoreWarnings();
 501
 502                         if( ! $success ) {
 503                                 $wgOut->showFileRenameError( $this->mSavedFile,
 504                                   "${archive}/{$this->mUploadOldVersion}" );
 505                                 return false;
 506                         }
 507                         else wfDebug("$fname: moved file ".$this->mSavedFile." to ${archive}/{$this->mUploadOldVersion}\n");
 508                 }
 509                 else {
 510                         $this->mUploadOldVersion = '';
 511                 }
 512
 513                 wfSuppressWarnings();
 514                 $success = $useRename
 515                         ? rename( $tempName, $this->mSavedFile )
 516                         : move_uploaded_file( $tempName, $this->mSavedFile );
 517                 wfRestoreWarnings();
 518
 519                 if( ! $success ) {
 520                         $wgOut->showFileCopyError( $tempName, $this->mSavedFile );
 521                         return false;
 522                 } else {
 523                         wfDebug("$fname: wrote tempfile $tempName to ".$this->mSavedFile."\n");
 524                 }
 525
 526                 chmod( $this->mSavedFile, 0644 );
 527                 return true;
 528         }
 529
 530         /**
 531          * Stash a file in a temporary directory for later processing
 532          * after the user has confirmed it.
 533          *
 534          * If the user doesn't explicitly cancel or accept, these files
 535          * can accumulate in the temp directory.
 536          *
 537          * @param string $saveName - the destination filename
 538          * @param string $tempName - the source temporary file to save
 539          * @return string - full path the stashed file, or false on failure
 540          * @access private
 541          */
 542         function saveTempUploadedFile( $saveName, $tempName ) {
 543                 global $wgOut;
 544                 $archive = wfImageArchiveDir( $saveName, 'temp' );
 545                 if ( !is_dir ( $archive ) ) wfMkdirParents( $archive );
 546                 $stash = $archive . '/' . gmdate( "YmdHis" ) . '!' . $saveName;
 547
 548                 $success = $this->mRemoveTempFile
 549                         ? rename( $tempName, $stash )
 550                         : move_uploaded_file( $tempName, $stash );
 551                 if ( !$success ) {
 552                         $wgOut->showFileCopyError( $tempName, $stash );
 553                         return false;
 554                 }
 555
 556                 return $stash;
 557         }
 558
 559         /**
 560          * Stash a file in a temporary directory for later processing,
 561          * and save the necessary descriptive info into the session.
 562          * Returns a key value which will be passed through a form
 563          * to pick up the path info on a later invocation.
 564          *
 565          * @return int
 566          * @access private
 567          */
 568         function stashSession() {
 569                 $stash = $this->saveTempUploadedFile(
 570                         $this->mUploadSaveName, $this->mUploadTempName );
 571
 572                 if( !$stash ) {
 573                         # Couldn't save the file.
 574                         return false;
 575                 }
 576
 577                 $key = mt_rand( 0, 0x7fffffff );
 578                 $_SESSION['wsUploadData'][$key] = array(
 579                         'mUploadTempName' => $stash,
 580                         'mUploadSize'     => $this->mUploadSize,
 581                         'mOname'          => $this->mOname );
 582                 return $key;
 583         }
 584
 585         /**
 586          * Remove a temporarily kept file stashed by saveTempUploadedFile().
 587          * @access private
 588          * @return success
 589          */
 590         function unsaveUploadedFile() {
 591                 global $wgOut;
 592                 wfSuppressWarnings();
 593                 $success = unlink( $this->mUploadTempName );
 594                 wfRestoreWarnings();
 595                 if ( ! $success ) {
 596                         $wgOut->showFileDeleteError( $this->mUploadTempName );
 597                         return false;
 598                 } else {
 599                         return true;
 600                 }
 601         }
 602
 603         /* -------------------------------------------------------------- */
 604
 605         /**
 606          * Show some text and linkage on successful upload.
 607          * @access private
 608          */
 609         function showSuccess() {
 610                 global $wgUser, $wgOut, $wgContLang;
 611
 612                 $sk = $wgUser->getSkin();
 613                 $ilink = $sk->makeMediaLink( $this->mUploadSaveName, Image::imageUrl( $this->mUploadSaveName ) );
 614                 $dname = $wgContLang->getNsText( NS_IMAGE ) . ':'.$this->mUploadSaveName;
 615                 $dlink = $sk->makeKnownLink( $dname, $dname );
 616
 617                 $wgOut->addHTML( '<h2>' . wfMsgHtml( 'successfulupload' ) . "</h2>\n" );
 618                 $text = wfMsgWikiHtml( 'fileuploaded', $ilink, $dlink );
 619                 $wgOut->addHTML( $text );
 620                 $wgOut->returnToMain( false );
 621         }
 622
 623         /**
 624          * @param string $error as HTML
 625          * @access private
 626          */
 627         function uploadError( $error ) {
 628                 global $wgOut;
 629                 $wgOut->addHTML( "<h2>" . wfMsgHtml( 'uploadwarning' ) . "</h2>\n" );
 630                 $wgOut->addHTML( "<span class='error'>{$error}</span>\n" );
 631         }
 632
 633         /**
 634          * There's something wrong with this file, not enough to reject it
 635          * totally but we require manual intervention to save it for real.
 636          * Stash it away, then present a form asking to confirm or cancel.
 637          *
 638          * @param string $warning as HTML
 639          * @access private
 640          */
 641         function uploadWarning( $warning ) {
 642                 global $wgOut;
 643                 global $wgUseCopyrightUpload;
 644
 645                 $this->mSessionKey = $this->stashSession();
 646                 if( !$this->mSessionKey ) {
 647                         # Couldn't save file; an error has been displayed so let's go.
 648                         return;
 649                 }
 650
 651                 $wgOut->addHTML( "<h2>" . wfMsgHtml( 'uploadwarning' ) . "</h2>\n" );
 652                 $wgOut->addHTML( "<ul class='warning'>{$warning}</ul><br />\n" );
 653
 654                 $save = wfMsgHtml( 'savefile' );
 655                 $reupload = wfMsgHtml( 'reupload' );
 656                 $iw = wfMsgWikiHtml( 'ignorewarning' );
 657                 $reup = wfMsgWikiHtml( 'reuploaddesc' );
 658                 $titleObj = SpecialPage::getTitleFor( 'Upload' );
 659                 $action = $titleObj->escapeLocalURL( 'action=submit' );
 660
 661                 if ( $wgUseCopyrightUpload )
 662                 {
 663                         $copyright =  "
 664         <input type='hidden' name='wpUploadCopyStatus' value=\"" . htmlspecialchars( $this->mUploadCopyStatus ) . "\" />
 665         <input type='hidden' name='wpUploadSource' value=\"" . htmlspecialchars( $this->mUploadSource ) . "\" />
 666         ";
 667                 } else {
 668                         $copyright = "";
 669                 }
 670
 671                 $wgOut->addHTML( "
 672         <form id='uploadwarning' method='post' enctype='multipart/form-data' action='$action'>
 673                 <input type='hidden' name='wpIgnoreWarning' value='1' />
 674                 <input type='hidden' name='wpSessionKey' value=\"" . htmlspecialchars( $this->mSessionKey ) . "\" />
 675                 <input type='hidden' name='wpUploadDescription' value=\"" . htmlspecialchars( $this->mUploadDescription ) . "\" />
 676                 <input type='hidden' name='wpLicense' value=\"" . htmlspecialchars( $this->mLicense ) . "\" />
 677                 <input type='hidden' name='wpDestFile' value=\"" . htmlspecialchars( $this->mDestFile ) . "\" />
 678                 <input type='hidden' name='wpWatchthis' value=\"" . htmlspecialchars( intval( $this->mWatchthis ) ) . "\" />
 679         {$copyright}
 680         <table border='0'>
 681                 <tr>
 682                         <tr>
 683                                 <td align='right'>
 684                                         <input tabindex='2' type='submit' name='wpUpload' value=\"$save\" />
 685                                 </td>
 686                                 <td align='left'>$iw</td>
 687                         </tr>
 688                         <tr>
 689                                 <td align='right'>
 690                                         <input tabindex='2' type='submit' name='wpReUpload' value=\"{$reupload}\" />
 691                                 </td>
 692                                 <td align='left'>$reup</td>
 693                         </tr>
 694                 </tr>
 695         </table></form>\n" );
 696         }
 697
 698         /**
 699          * Displays the main upload form, optionally with a highlighted
 700          * error message up at the top.
 701          *
 702          * @param string $msg as HTML
 703          * @access private
 704          */
 705         function mainUploadForm( $msg='' ) {
 706                 global $wgOut, $wgUser;
 707                 global $wgUseCopyrightUpload;
 708                 global $wgRequest, $wgAllowCopyUploads;
 709
 710                 if( !wfRunHooks( 'UploadForm:initial', array( &$this ) ) )
 711                 {
 712                         wfDebug( "Hook 'UploadForm:initial' broke output of the upload form" );
 713                         return false;
 714                 }
 715
 716                 $cols = intval($wgUser->getOption( 'cols' ));
 717                 $ew = $wgUser->getOption( 'editwidth' );
 718                 if ( $ew ) $ew = " style=\"width:100%\"";
 719                 else $ew = '';
 720
 721                 if ( '' != $msg ) {
 722                         $sub = wfMsgHtml( 'uploaderror' );
 723                         $wgOut->addHTML( "<h2>{$sub}</h2>\n" .
 724                           "<span class='error'>{$msg}</span>\n" );
 725                 }
 726                 $wgOut->addHTML( '<div id="uploadtext">' );
 727                 $wgOut->addWikiText( wfMsg( 'uploadtext' ) );
 728                 $wgOut->addHTML( '</div>' );
 729
 730                 $sourcefilename = wfMsgHtml( 'sourcefilename' );
 731                 $destfilename = wfMsgHtml( 'destfilename' );
 732                 $summary = wfMsgWikiHtml( 'fileuploadsummary' );
 733
 734                 $licenses = new Licenses();
 735                 $license = wfMsgHtml( 'license' );
 736                 $nolicense = wfMsgHtml( 'nolicense' );
 737                 $licenseshtml = $licenses->getHtml();
 738
 739                 $ulb = wfMsgHtml( 'uploadbtn' );
 740
 741
 742                 $titleObj = SpecialPage::getTitleFor( 'Upload' );
 743                 $action = $titleObj->escapeLocalURL();
 744
 745                 $encDestFile = htmlspecialchars( $this->mDestFile );
 746
 747                 $watchChecked =
 748                         ( $wgUser->getOption( 'watchdefault' ) ||
 749                                 ( $wgUser->getOption( 'watchcreations' ) && $this->mDestFile == '' ) )
 750                         ? 'checked="checked"'
 751                         : '';
 752
 753                 // Prepare form for upload or upload/copy
 754                 if( $wgAllowCopyUploads && $wgUser->isAllowed( 'upload_by_url' ) ) {
 755                         $filename_form =
 756                                 "<input type='radio' id='wpSourceTypeFile' name='wpSourceType' value='file' onchange='toggle_element_activation(\"wpUploadFileURL\",\"wpUploadFile\")' checked />" .
 757                                 "<input tabindex='1' type='file' name='wpUploadFile' id='wpUploadFile' onfocus='toggle_element_activation(\"wpUploadFileURL\",\"wpUploadFile\");toggle_element_check(\"wpSourceTypeFile\",\"wpSourceTypeURL\")'" .
 758                                 ($this->mDestFile?"":"onchange='fillDestFilename(\"wpUploadFile\")' ") . "size='40' />" .
 759                                 wfMsgHTML( 'upload_source_file' ) . "<br/>" .
 760                                 "<input type='radio' id='wpSourceTypeURL' name='wpSourceType' value='web' onchange='toggle_element_activation(\"wpUploadFile\",\"wpUploadFileURL\")' />" .
 761                                 "<input tabindex='1' type='text' name='wpUploadFileURL' id='wpUploadFileURL' onfocus='toggle_element_activation(\"wpUploadFile\",\"wpUploadFileURL\");toggle_element_check(\"wpSourceTypeURL\",\"wpSourceTypeFile\")'" .
 762                                 ($this->mDestFile?"":"onchange='fillDestFilename(\"wpUploadFileURL\")' ") . "size='40' DISABLED />" .
 763                                 wfMsgHtml( 'upload_source_url' ) ;
 764                 } else {
 765                         $filename_form =
 766                                 "<input tabindex='1' type='file' name='wpUploadFile' id='wpUploadFile' " .
 767                                 ($this->mDestFile?"":"onchange='fillDestFilename(\"wpUploadFile\")' ") .
 768                                 "size='40' />" .
 769                                 "<input type='hidden' name='wpSourceType' value='file' />" ;
 770                 }
 771
 772                 $wgOut->addHTML( "
 773         <form id='upload' method='post' enctype='multipart/form-data' action=\"$action\">
 774                 <table border='0'>
 775                 <tr>
 776           {$this->uploadFormTextTop}
 777                         <td align='right' valign='top'><label for='wpUploadFile'>{$sourcefilename}:</label></td>
 778                         <td align='left'>
 779                                 {$filename_form}
 780                         </td>
 781                 </tr>
 782                 <tr>
 783                         <td align='right'><label for='wpDestFile'>{$destfilename}:</label></td>
 784                         <td align='left'>
 785                                 <input tabindex='2' type='text' name='wpDestFile' id='wpDestFile' size='40' value=\"$encDestFile\" />
 786                         </td>
 787                 </tr>
 788                 <tr>
 789                         <td align='right'><label for='wpUploadDescription'>{$summary}</label></td>
 790                         <td align='left'>
 791                                 <textarea tabindex='3' name='wpUploadDescription' id='wpUploadDescription' rows='6' cols='{$cols}'{$ew}>" . htmlspecialchars( $this->mUploadDescription ) . "</textarea>
 792            {$this->uploadFormTextAfterSummary}
 793                         </td>
 794                 </tr>
 795                 <tr>" );
 796
 797                 if ( $licenseshtml != '' ) {
 798                         global $wgStylePath;
 799                         $wgOut->addHTML( "
 800                         <td align='right'><label for='wpLicense'>$license:</label></td>
 801                         <td align='left'>
 802                                 <script type='text/javascript' src=\"$wgStylePath/common/upload.js\"></script>
 803                                 <select name='wpLicense' id='wpLicense' tabindex='4'
 804                                         onchange='licenseSelectorCheck()'>
 805                                         <option value=''>$nolicense</option>
 806                                         $licenseshtml
 807                                 </select>
 808                         </td>
 809                         </tr>
 810                         <tr>
 811                 ");
 812                 }
 813
 814                 if ( $wgUseCopyrightUpload ) {
 815                         $filestatus = wfMsgHtml ( 'filestatus' );
 816                         $copystatus =  htmlspecialchars( $this->mUploadCopyStatus );
 817                         $filesource = wfMsgHtml ( 'filesource' );
 818                         $uploadsource = htmlspecialchars( $this->mUploadSource );
 819
 820                         $wgOut->addHTML( "
 821                                 <td align='right' nowrap='nowrap'><label for='wpUploadCopyStatus'>$filestatus:</label></td>
 822                                 <td><input tabindex='5' type='text' name='wpUploadCopyStatus' id='wpUploadCopyStatus' value=\"$copystatus\" size='40' /></td>
 823                         </tr>
 824                         <tr>
 825                                 <td align='right'><label for='wpUploadCopyStatus'>$filesource:</label></td>
 826                                 <td><input tabindex='6' type='text' name='wpUploadSource' id='wpUploadCopyStatus' value=\"$uploadsource\" size='40' /></td>
 827                         </tr>
 828                         <tr>
 829                 ");
 830                 }
 831
 832
 833                 $wgOut->addHtml( "
 834                 <td></td>
 835                 <td>
 836                         <input tabindex='7' type='checkbox' name='wpWatchthis' id='wpWatchthis' $watchChecked value='true' />
 837                         <label for='wpWatchthis'>" . wfMsgHtml( 'watchthisupload' ) . "</label>
 838                         <input tabindex='8' type='checkbox' name='wpIgnoreWarning' id='wpIgnoreWarning' value='true' />
 839                         <label for='wpIgnoreWarning'>" . wfMsgHtml( 'ignorewarnings' ) . "</label>
 840                 </td>
 841         </tr>
 842         <tr>
 843
 844         </tr>
 845         <tr>
 846                 <td></td>
 847                 <td align='left'><input tabindex='9' type='submit' name='wpUpload' value=\"{$ulb}\" /></td>
 848         </tr>
 849
 850         <tr>
 851                 <td></td>
 852                 <td align='left'>
 853                 " );
 854                 $wgOut->addWikiText( wfMsgForContent( 'edittools' ) );
 855                 $wgOut->addHTML( "
 856                 </td>
 857         </tr>
 858
 859         </table>
 860         </form>" );
 861         }
 862
 863         /* -------------------------------------------------------------- */
 864
 865         /**
 866          * Split a file into a base name and all dot-delimited 'extensions'
 867          * on the end. Some web server configurations will fall back to
 868          * earlier pseudo-'extensions' to determine type and execute
 869          * scripts, so the blacklist needs to check them all.
 870          *
 871          * @return array
 872          */
 873         function splitExtensions( $filename ) {
 874                 $bits = explode( '.', $filename );
 875                 $basename = array_shift( $bits );
 876                 return array( $basename, $bits );
 877         }
 878
 879         /**
 880          * Perform case-insensitive match against a list of file extensions.
 881          * Returns true if the extension is in the list.
 882          *
 883          * @param string $ext
 884          * @param array $list
 885          * @return bool
 886          */
 887         function checkFileExtension( $ext, $list ) {
 888                 return in_array( strtolower( $ext ), $list );
 889         }
 890
 891         /**
 892          * Perform case-insensitive match against a list of file extensions.
 893          * Returns true if any of the extensions are in the list.
 894          *
 895          * @param array $ext
 896          * @param array $list
 897          * @return bool
 898          */
 899         function checkFileExtensionList( $ext, $list ) {
 900                 foreach( $ext as $e ) {
 901                         if( in_array( strtolower( $e ), $list ) ) {
 902                                 return true;
 903                         }
 904                 }
 905                 return false;
 906         }
 907
 908         /**
 909          * Verifies that it's ok to include the uploaded file
 910          *
 911          * @param string $tmpfile the full path of the temporary file to verify
 912          * @param string $extension The filename extension that the file is to be served with
 913          * @return mixed true of the file is verified, a WikiError object otherwise.
 914          */
 915         function verify( $tmpfile, $extension ) {
 916                 #magically determine mime type
 917                 $magic=& MimeMagic::singleton();
 918                 $mime= $magic->guessMimeType($tmpfile,false);
 919
 920                 $fname= "SpecialUpload::verify";
 921
 922                 #check mime type, if desired
 923                 global $wgVerifyMimeType;
 924                 if ($wgVerifyMimeType) {
 925
 926                         #check mime type against file extension
 927                         if( !$this->verifyExtension( $mime, $extension ) ) {
 928                                 return new WikiErrorMsg( 'uploadcorrupt' );
 929                         }
 930
 931                         #check mime type blacklist
 932                         global $wgMimeTypeBlacklist;
 933                         if( isset($wgMimeTypeBlacklist) && !is_null($wgMimeTypeBlacklist)
 934                                 && $this->checkFileExtension( $mime, $wgMimeTypeBlacklist ) ) {
 935                                 return new WikiErrorMsg( 'badfiletype', htmlspecialchars( $mime ) );
 936                         }
 937                 }
 938
 939                 #check for htmlish code and javascript
 940                 if( $this->detectScript ( $tmpfile, $mime, $extension ) ) {
 941                         return new WikiErrorMsg( 'uploadscripted' );
 942                 }
 943
 944                 /**
 945                 * Scan the uploaded file for viruses
 946                 */
 947                 $virus= $this->detectVirus($tmpfile);
 948                 if ( $virus ) {
 949                         return new WikiErrorMsg( 'uploadvirus', htmlspecialchars($virus) );
 950                 }
 951
 952                 wfDebug( "$fname: all clear; passing.\n" );
 953                 return true;
 954         }
 955
 956         /**
 957          * Checks if the mime type of the uploaded file matches the file extension.
 958          *
 959          * @param string $mime the mime type of the uploaded file
 960          * @param string $extension The filename extension that the file is to be served with
 961          * @return bool
 962          */
 963         function verifyExtension( $mime, $extension ) {
 964                 $fname = 'SpecialUpload::verifyExtension';
 965
 966                 $magic =& MimeMagic::singleton();
 967
 968                 if ( ! $mime || $mime == 'unknown' || $mime == 'unknown/unknown' )
 969                         if ( ! $magic->isRecognizableExtension( $extension ) ) {
 970                                 wfDebug( "$fname: passing file with unknown detected mime type; unrecognized extension '$extension', can't verify\n" );
 971                                 return true;
 972                         } else {
 973                                 wfDebug( "$fname: rejecting file with unknown detected mime type; recognized extension '$extension', so probably invalid file\n" );
 974                                 return false;
 975                         }
 976
 977                 $match= $magic->isMatchingExtension($extension,$mime);
 978
 979                 if ($match===NULL) {
 980                         wfDebug( "$fname: no file extension known for mime type $mime, passing file\n" );
 981                         return true;
 982                 } elseif ($match===true) {
 983                         wfDebug( "$fname: mime type $mime matches extension $extension, passing file\n" );
 984
 985                         #TODO: if it's a bitmap, make sure PHP or ImageMagic resp. can handle it!
 986                         return true;
 987
 988                 } else {
 989                         wfDebug( "$fname: mime type $mime mismatches file extension $extension, rejecting file\n" );
 990                         return false;
 991                 }
 992         }
 993
 994         /** Heuristig for detecting files that *could* contain JavaScript instructions or
 995         * things that may look like HTML to a browser and are thus
 996         * potentially harmful. The present implementation will produce false positives in some situations.
 997         *
 998         * @param string $file Pathname to the temporary upload file
 999         * @param string $mime The mime type of the file
1000         * @param string $extension The extension of the file
1001         * @return bool true if the file contains something looking like embedded scripts
1002         */
1003         function detectScript($file, $mime, $extension) {
1004                 global $wgAllowTitlesInSVG;
1005
1006                 #ugly hack: for text files, always look at the entire file.
1007                 #For binarie field, just check the first K.
1008
1009                 if (strpos($mime,'text/')===0) $chunk = file_get_contents( $file );
1010                 else {
1011                         $fp = fopen( $file, 'rb' );
1012                         $chunk = fread( $fp, 1024 );
1013                         fclose( $fp );
1014                 }
1015
1016                 $chunk= strtolower( $chunk );
1017
1018                 if (!$chunk) return false;
1019
1020                 #decode from UTF-16 if needed (could be used for obfuscation).
1021                 if (substr($chunk,0,2)=="\xfe\xff") $enc= "UTF-16BE";
1022                 elseif (substr($chunk,0,2)=="\xff\xfe") $enc= "UTF-16LE";
1023                 else $enc= NULL;
1024
1025                 if ($enc) $chunk= iconv($enc,"ASCII//IGNORE",$chunk);
1026
1027                 $chunk= trim($chunk);
1028
1029                 #FIXME: convert from UTF-16 if necessarry!
1030
1031                 wfDebug("SpecialUpload::detectScript: checking for embedded scripts and HTML stuff\n");
1032
1033                 #check for HTML doctype
1034                 if (eregi("<!DOCTYPE *X?HTML",$chunk)) return true;
1035
1036                 /**
1037                 * Internet Explorer for Windows performs some really stupid file type
1038                 * autodetection which can cause it to interpret valid image files as HTML
1039                 * and potentially execute JavaScript, creating a cross-site scripting
1040                 * attack vectors.
1041                 *
1042                 * Apple's Safari browser also performs some unsafe file type autodetection
1043                 * which can cause legitimate files to be interpreted as HTML if the
1044                 * web server is not correctly configured to send the right content-type
1045                 * (or if you're really uploading plain text and octet streams!)
1046                 *
1047                 * Returns true if IE is likely to mistake the given file for HTML.
1048                 * Also returns true if Safari would mistake the given file for HTML
1049                 * when served with a generic content-type.
1050                 */
1051
1052                 $tags = array(
1053                         '<body',
1054                         '<head',
1055                         '<html',   #also in safari
1056                         '<img',
1057                         '<pre',
1058                         '<script', #also in safari
1059                         '<table'
1060                         );
1061                 if( ! $wgAllowTitlesInSVG && $extension !== 'svg' && $mime !== 'image/svg' ) {
1062                         $tags[] = '<title';
1063                 }
1064
1065                 foreach( $tags as $tag ) {
1066                         if( false !== strpos( $chunk, $tag ) ) {
1067                                 return true;
1068                         }
1069                 }
1070
1071                 /*
1072                 * look for javascript
1073                 */
1074
1075                 #resolve entity-refs to look at attributes. may be harsh on big files... cache result?
1076                 $chunk = Sanitizer::decodeCharReferences( $chunk );
1077
1078                 #look for script-types
1079                 if (preg_match('!type\s*=\s*[\'"]?\s*(\w*/)?(ecma|java)!sim',$chunk)) return true;
1080
1081                 #look for html-style script-urls
1082                 if (preg_match('!(href|src|data)\s*=\s*[\'"]?\s*(ecma|java)script:!sim',$chunk)) return true;
1083
1084                 #look for css-style script-urls
1085                 if (preg_match('!url\s*\(\s*[\'"]?\s*(ecma|java)script:!sim',$chunk)) return true;
1086
1087                 wfDebug("SpecialUpload::detectScript: no scripts found\n");
1088                 return false;
1089         }
1090
1091         /** Generic wrapper function for a virus scanner program.
1092         * This relies on the $wgAntivirus and $wgAntivirusSetup variables.
1093         * $wgAntivirusRequired may be used to deny upload if the scan fails.
1094         *
1095         * @param string $file Pathname to the temporary upload file
1096         * @return mixed false if not virus is found, NULL if the scan fails or is disabled,
1097         *         or a string containing feedback from the virus scanner if a virus was found.
1098         *         If textual feedback is missing but a virus was found, this function returns true.
1099         */
1100         function detectVirus($file) {
1101                 global $wgAntivirus, $wgAntivirusSetup, $wgAntivirusRequired, $wgOut;
1102
1103                 $fname= "SpecialUpload::detectVirus";
1104
1105                 if (!$wgAntivirus) { #disabled?
1106                         wfDebug("$fname: virus scanner disabled\n");
1107
1108                         return NULL;
1109                 }
1110
1111                 if (!$wgAntivirusSetup[$wgAntivirus]) {
1112                         wfDebug("$fname: unknown virus scanner: $wgAntivirus\n");
1113
1114                         $wgOut->addHTML( "<div class='error'>Bad configuration: unknown virus scanner: <i>$wgAntivirus</i></div>\n" ); #LOCALIZE
1115
1116                         return "unknown antivirus: $wgAntivirus";
1117                 }
1118
1119                 #look up scanner configuration
1120                 $virus_scanner= $wgAntivirusSetup[$wgAntivirus]["command"]; #command pattern
1121                 $virus_scanner_codes= $wgAntivirusSetup[$wgAntivirus]["codemap"]; #exit-code map
1122                 $msg_pattern= $wgAntivirusSetup[$wgAntivirus]["messagepattern"]; #message pattern
1123
1124                 $scanner= $virus_scanner; #copy, so we can resolve the pattern
1125
1126                 if (strpos($scanner,"%f")===false) $scanner.= " ".wfEscapeShellArg($file); #simple pattern: append file to scan
1127                 else $scanner= str_replace("%f",wfEscapeShellArg($file),$scanner); #complex pattern: replace "%f" with file to scan
1128
1129                 wfDebug("$fname: running virus scan: $scanner \n");
1130
1131                 #execute virus scanner
1132                 $code= false;
1133
1134                 #NOTE: there's a 50 line workaround to make stderr redirection work on windows, too.
1135                 #      that does not seem to be worth the pain.
1136                 #      Ask me (Duesentrieb) about it if it's ever needed.
1137                 $output = array();
1138                 if (wfIsWindows()) exec("$scanner",$output,$code);
1139                 else exec("$scanner 2>&1",$output,$code);
1140
1141                 $exit_code= $code; #remember for user feedback
1142
1143                 if ($virus_scanner_codes) { #map exit code to AV_xxx constants.
1144                         if (isset($virus_scanner_codes[$code])) {
1145                                 $code= $virus_scanner_codes[$code]; # explicit mapping
1146                         } else if (isset($virus_scanner_codes["*"])) {
1147                                 $code= $virus_scanner_codes["*"];   # fallback mapping
1148                         }
1149                 }
1150
1151                 if ($code===AV_SCAN_FAILED) { #scan failed (code was mapped to false by $virus_scanner_codes)
1152                         wfDebug("$fname: failed to scan $file (code $exit_code).\n");
1153
1154                         if ($wgAntivirusRequired) { return "scan failed (code $exit_code)"; }
1155                         else { return NULL; }
1156                 }
1157                 else if ($code===AV_SCAN_ABORTED) { #scan failed because filetype is unknown (probably imune)
1158                         wfDebug("$fname: unsupported file type $file (code $exit_code).\n");
1159                         return NULL;
1160                 }
1161                 else if ($code===AV_NO_VIRUS) {
1162                         wfDebug("$fname: file passed virus scan.\n");
1163                         return false; #no virus found
1164                 }
1165                 else {
1166                         $output= join("\n",$output);
1167                         $output= trim($output);
1168
1169                         if (!$output) $output= true; #if there's no output, return true
1170                         else if ($msg_pattern) {
1171                                 $groups= array();
1172                                 if (preg_match($msg_pattern,$output,$groups)) {
1173                                         if ($groups[1]) $output= $groups[1];
1174                                 }
1175                         }
1176
1177                         wfDebug("$fname: FOUND VIRUS! scanner feedback: $output");
1178                         return $output;
1179                 }
1180         }
1181
1182         /**
1183          * Check if the temporary file is MacBinary-encoded, as some uploads
1184          * from Internet Explorer on Mac OS Classic and Mac OS X will be.
1185          * If so, the data fork will be extracted to a second temporary file,
1186          * which will then be checked for validity and either kept or discarded.
1187          *
1188          * @access private
1189          */
1190         function checkMacBinary() {
1191                 $macbin = new MacBinary( $this->mUploadTempName );
1192                 if( $macbin->isValid() ) {
1193                         $dataFile = tempnam( wfTempDir(), "WikiMacBinary" );
1194                         $dataHandle = fopen( $dataFile, 'wb' );
1195
1196                         wfDebug( "SpecialUpload::checkMacBinary: Extracting MacBinary data fork to $dataFile\n" );
1197                         $macbin->extractData( $dataHandle );
1198
1199                         $this->mUploadTempName = $dataFile;
1200                         $this->mUploadSize = $macbin->dataForkLength();
1201
1202                         // We'll have to manually remove the new file if it's not kept.
1203                         $this->mRemoveTempFile = true;
1204                 }
1205                 $macbin->close();
1206         }
1207
1208         /**
1209          * If we've modified the upload file we need to manually remove it
1210          * on exit to clean up.
1211          * @access private
1212          */
1213         function cleanupTempFile() {
1214                 if( $this->mRemoveTempFile && file_exists( $this->mUploadTempName ) ) {
1215                         wfDebug( "SpecialUpload::cleanupTempFile: Removing temporary file $this->mUploadTempName\n" );
1216                         unlink( $this->mUploadTempName );
1217                 }
1218         }
1219
1220         /**
1221          * Check if there's an overwrite conflict and, if so, if restrictions
1222          * forbid this user from performing the upload.
1223          *
1224          * @return mixed true on success, WikiError on failure
1225          * @access private
1226          */
1227         function checkOverwrite( $name ) {
1228                 $img = Image::newFromName( $name );
1229                 if( is_null( $img ) ) {
1230                         // Uh... this shouldn't happen ;)
1231                         // But if it does, fall through to previous behavior
1232                         return false;
1233                 }
1234
1235                 $error = '';
1236                 if( $img->exists() ) {
1237                         global $wgUser, $wgOut;
1238                         if( $img->isLocal() ) {
1239                                 if( !$wgUser->isAllowed( 'reupload' ) ) {
1240                                         $error = 'fileexists-forbidden';
1241                                 }
1242                         } else {
1243                                 if( !$wgUser->isAllowed( 'reupload' ) ||
1244                                     !$wgUser->isAllowed( 'reupload-shared' ) ) {
1245                                         $error = "fileexists-shared-forbidden";
1246                                 }
1247                         }
1248                 }
1249
1250                 if( $error ) {
1251                         $errorText = wfMsg( $error, wfEscapeWikiText( $img->getName() ) );
1252                         return new WikiError( $wgOut->parse( $errorText ) );
1253                 }
1254
1255                 // Rockin', go ahead and upload
1256                 return true;
1257         }
1258
1259 }
1260
1261
1262 ?>