includes/SpecialUpload.php

   1 <?php
   2 /**
   3  *
   4  * @addtogroup SpecialPage
   5  */
   6
   7
   8 /**
   9  * Entry point
  10  */
  11 function wfSpecialUpload() {
  12         global $wgRequest;
  13         $form = new UploadForm( $wgRequest );
  14         $form->execute();
  15 }
  16
  17 /**
  18  *
  19  * @addtogroup SpecialPage
  20  */
  21 class UploadForm {
  22         /**#@+
  23          * @access private
  24          */
  25         var $mUploadFile, $mUploadDescription, $mLicense ,$mIgnoreWarning, $mUploadError;
  26         var $mUploadSaveName, $mUploadTempName, $mUploadSize, $mUploadOldVersion;
  27         var $mUploadCopyStatus, $mUploadSource, $mReUpload, $mAction, $mUpload;
  28         var $mOname, $mSessionKey, $mStashed, $mDestFile, $mRemoveTempFile, $mSourceType;
  29         var $mUploadTempFileSize = 0;
  30
  31         # Placeholders for text injection by hooks (must be HTML)
  32         # extensions should take care to _append_ to the present value
  33         var $uploadFormTextTop;
  34         var $uploadFormTextAfterSummary;
  35
  36         /**#@-*/
  37
  38         /**
  39          * Constructor : initialise object
  40          * Get data POSTed through the form and assign them to the object
  41          * @param $request Data posted.
  42          */
  43         function UploadForm( &$request ) {
  44                 global $wgAllowCopyUploads;
  45                 $this->mDestFile          = $request->getText( 'wpDestFile' );
  46
  47                 if( !$request->wasPosted() ) {
  48                         # GET requests just give the main form; no data except wpDestfile.
  49                         return;
  50                 }
  51
  52                 # Placeholders for text injection by hooks (empty per default)
  53                 $this->uploadFormTextTop = "";
  54                 $this->uploadFormTextAfterSummary = "";
  55
  56                 $this->mIgnoreWarning     = $request->getCheck( 'wpIgnoreWarning' );
  57                 $this->mReUpload          = $request->getCheck( 'wpReUpload' );
  58                 $this->mUpload            = $request->getCheck( 'wpUpload' );
  59
  60                 $this->mUploadDescription = $request->getText( 'wpUploadDescription' );
  61                 $this->mLicense           = $request->getText( 'wpLicense' );
  62                 $this->mUploadCopyStatus  = $request->getText( 'wpUploadCopyStatus' );
  63                 $this->mUploadSource      = $request->getText( 'wpUploadSource' );
  64                 $this->mWatchthis         = $request->getBool( 'wpWatchthis' );
  65                 $this->mSourceType         = $request->getText( 'wpSourceType' );
  66                 wfDebug( "UploadForm: watchthis is: '$this->mWatchthis'\n" );
  67
  68                 $this->mAction            = $request->getVal( 'action' );
  69
  70                 $this->mSessionKey        = $request->getInt( 'wpSessionKey' );
  71                 if( !empty( $this->mSessionKey ) &&
  72                         isset( $_SESSION['wsUploadData'][$this->mSessionKey] ) ) {
  73                         /**
  74                          * Confirming a temporarily stashed upload.
  75                          * We don't want path names to be forged, so we keep
  76                          * them in the session on the server and just give
  77                          * an opaque key to the user agent.
  78                          */
  79                         $data = $_SESSION['wsUploadData'][$this->mSessionKey];
  80                         $this->mUploadTempName   = $data['mUploadTempName'];
  81                         $this->mUploadSize       = $data['mUploadSize'];
  82                         $this->mOname            = $data['mOname'];
  83                         $this->mUploadError      = 0/*UPLOAD_ERR_OK*/;
  84                         $this->mStashed          = true;
  85                         $this->mRemoveTempFile   = false;
  86                 } else {
  87                         /**
  88                          *Check for a newly uploaded file.
  89                          */
  90                         if( $wgAllowCopyUploads && $this->mSourceType == 'web' ) {
  91                                 $this->initializeFromUrl( $request );
  92                         } else {
  93                                 $this->initializeFromUpload( $request );
  94                         }
  95                 }
  96         }
  97
  98         /**
  99          * Initialize the uploaded file from PHP data
 100          * @access private
 101          */
 102         function initializeFromUpload( $request ) {
 103                 $this->mUploadTempName = $request->getFileTempName( 'wpUploadFile' );
 104                 $this->mUploadSize     = $request->getFileSize( 'wpUploadFile' );
 105                 $this->mOname          = $request->getFileName( 'wpUploadFile' );
 106                 $this->mUploadError    = $request->getUploadError( 'wpUploadFile' );
 107                 $this->mSessionKey     = false;
 108                 $this->mStashed        = false;
 109                 $this->mRemoveTempFile = false; // PHP will handle this
 110         }
 111
 112         /**
 113          * Copy a web file to a temporary file
 114          * @access private
 115          */
 116         function initializeFromUrl( $request ) {
 117                 global $wgTmpDirectory;
 118                 $url = $request->getText( 'wpUploadFileURL' );
 119                 $local_file = tempnam( $wgTmpDirectory, 'WEBUPLOAD' );
 120
 121                 $this->mUploadTempName = $local_file;
 122                 $this->mUploadError    = $this->curlCopy( $url, $local_file );
 123                 $this->mUploadSize     = $this->mUploadTempFileSize;
 124                 $this->mOname          = array_pop( explode( '/', $url ) );
 125                 $this->mSessionKey     = false;
 126                 $this->mStashed        = false;
 127
 128                 // PHP won't auto-cleanup the file
 129                 $this->mRemoveTempFile = file_exists( $local_file );
 130         }
 131
 132         /**
 133          * Safe copy from URL
 134          * Returns true if there was an error, false otherwise
 135          */
 136         private function curlCopy( $url, $dest ) {
 137                 global $wgUser, $wgOut;
 138
 139                 if( !$wgUser->isAllowed( 'upload_by_url' ) ) {
 140                         $wgOut->permissionRequired( 'upload_by_url' );
 141                         return true;
 142                 }
 143
 144                 # Maybe remove some pasting blanks :-)
 145                 $url =  trim( $url );
 146                 if( stripos($url, 'http://') !== 0 && stripos($url, 'ftp://') !== 0 ) {
 147                         # Only HTTP or FTP URLs
 148                         $wgOut->errorPage( 'upload-proto-error', 'upload-proto-error-text' );
 149                         return true;
 150                 }
 151
 152                 # Open temporary file
 153                 $this->mUploadTempFile = @fopen( $this->mUploadTempName, "wb" );
 154                 if( $this->mUploadTempFile === false ) {
 155                         # Could not open temporary file to write in
 156                         $wgOut->errorPage( 'upload-file-error', 'upload-file-error-text');
 157                         return true;
 158                 }
 159
 160                 $ch = curl_init();
 161                 curl_setopt( $ch, CURLOPT_HTTP_VERSION, 1.0); # Probably not needed, but apparently can work around some bug
 162                 curl_setopt( $ch, CURLOPT_TIMEOUT, 10); # 10 seconds timeout
 163                 curl_setopt( $ch, CURLOPT_LOW_SPEED_LIMIT, 512); # 0.5KB per second minimum transfer speed
 164                 curl_setopt( $ch, CURLOPT_URL, $url);
 165                 curl_setopt( $ch, CURLOPT_WRITEFUNCTION, array( $this, 'uploadCurlCallback' ) );
 166                 curl_exec( $ch );
 167                 $error = curl_errno( $ch ) ? true : false;
 168                 $errornum =  curl_errno( $ch );
 169                 // if ( $error ) print curl_error ( $ch ) ; # Debugging output
 170                 curl_close( $ch );
 171
 172                 fclose( $this->mUploadTempFile );
 173                 unset( $this->mUploadTempFile );
 174                 if( $error ) {
 175                         unlink( $dest );
 176                         if( wfEmptyMsg( "upload-curl-error$errornum", wfMsg("upload-curl-error$errornum") ) )
 177                                 $wgOut->errorPage( 'upload-misc-error', 'upload-misc-error-text' );
 178                         else
 179                                 $wgOut->errorPage( "upload-curl-error$errornum", "upload-curl-error$errornum-text" );
 180                 }
 181
 182                 return $error;
 183         }
 184
 185         /**
 186          * Callback function for CURL-based web transfer
 187          * Write data to file unless we've passed the length limit;
 188          * if so, abort immediately.
 189          * @access private
 190          */
 191         function uploadCurlCallback( $ch, $data ) {
 192                 global $wgMaxUploadSize;
 193                 $length = strlen( $data );
 194                 $this->mUploadTempFileSize += $length;
 195                 if( $this->mUploadTempFileSize > $wgMaxUploadSize ) {
 196                         return 0;
 197                 }
 198                 fwrite( $this->mUploadTempFile, $data );
 199                 return $length;
 200         }
 201
 202         /**
 203          * Start doing stuff
 204          * @access public
 205          */
 206         function execute() {
 207                 global $wgUser, $wgOut;
 208                 global $wgEnableUploads, $wgUploadDirectory;
 209
 210                 # Check uploading enabled
 211                 if( !$wgEnableUploads ) {
 212                         $wgOut->showErrorPage( 'uploaddisabled', 'uploaddisabledtext' );
 213                         return;
 214                 }
 215
 216                 # Check permissions
 217                 if( !$wgUser->isAllowed( 'upload' ) ) {
 218                         if( !$wgUser->isLoggedIn() ) {
 219                                 $wgOut->showErrorPage( 'uploadnologin', 'uploadnologintext' );
 220                         } else {
 221                                 $wgOut->permissionRequired( 'upload' );
 222                         }
 223                         return;
 224                 }
 225
 226                 # Check blocks
 227                 if( $wgUser->isBlocked() ) {
 228                         $wgOut->blockedPage();
 229                         return;
 230                 }
 231
 232                 if( wfReadOnly() ) {
 233                         $wgOut->readOnlyPage();
 234                         return;
 235                 }
 236
 237                 /** Check if the image directory is writeable, this is a common mistake */
 238                 if( !is_writeable( $wgUploadDirectory ) ) {
 239                         $wgOut->addWikiText( wfMsg( 'upload_directory_read_only', $wgUploadDirectory ) );
 240                         return;
 241                 }
 242
 243                 if( $this->mReUpload ) {
 244                         if( !$this->unsaveUploadedFile() ) {
 245                                 return;
 246                         }
 247                         $this->mainUploadForm();
 248                 } else if( 'submit' == $this->mAction || $this->mUpload ) {
 249                         $this->processUpload();
 250                 } else {
 251                         $this->mainUploadForm();
 252                 }
 253
 254                 $this->cleanupTempFile();
 255         }
 256
 257         /* -------------------------------------------------------------- */
 258
 259         /**
 260          * Really do the upload
 261          * Checks are made in SpecialUpload::execute()
 262          * @access private
 263          */
 264         function processUpload() {
 265                 global $wgUser, $wgOut;
 266
 267                 if( !wfRunHooks( 'UploadForm:BeforeProcessing', array( &$this ) ) )
 268                 {
 269                         wfDebug( "Hook 'UploadForm:BeforeProcessing' broke processing the file." );
 270                         return false;
 271                 }
 272
 273                 /* Check for PHP error if any, requires php 4.2 or newer */
 274                 if( $this->mUploadError == 1/*UPLOAD_ERR_INI_SIZE*/ ) {
 275                         $this->mainUploadForm( wfMsgHtml( 'largefileserver' ) );
 276                         return;
 277                 }
 278
 279                 /**
 280                  * If there was no filename or a zero size given, give up quick.
 281                  */
 282                 if( trim( $this->mOname ) == '' || empty( $this->mUploadSize ) ) {
 283                         $this->mainUploadForm( wfMsgHtml( 'emptyfile' ) );
 284                         return;
 285                 }
 286
 287                 # Chop off any directories in the given filename
 288                 if( $this->mDestFile ) {
 289                         $basename = wfBaseName( $this->mDestFile );
 290                 } else {
 291                         $basename = wfBaseName( $this->mOname );
 292                 }
 293
 294                 /**
 295                  * We'll want to blacklist against *any* 'extension', and use
 296                  * only the final one for the whitelist.
 297                  */
 298                 list( $partname, $ext ) = $this->splitExtensions( $basename );
 299
 300                 if( count( $ext ) ) {
 301                         $finalExt = $ext[count( $ext ) - 1];
 302                 } else {
 303                         $finalExt = '';
 304                 }
 305
 306                 # If there was more than one "extension", reassemble the base
 307                 # filename to prevent bogus complaints about length
 308                 if( count( $ext ) > 1 ) {
 309                         for( $i = 0; $i < count( $ext ) - 1; $i++ )
 310                                 $partname .= '.' . $ext[$i];
 311                 }
 312
 313                 if( strlen( $partname ) < 3 ) {
 314                         $this->mainUploadForm( wfMsgHtml( 'minlength' ) );
 315                         return;
 316                 }
 317
 318                 /**
 319                  * Filter out illegal characters, and try to make a legible name
 320                  * out of it. We'll strip some silently that Title would die on.
 321                  */
 322                 $filtered = preg_replace ( "/[^".Title::legalChars()."]|:/", '-', $basename );
 323                 $nt = Title::newFromText( $filtered );
 324                 if( is_null( $nt ) ) {
 325                         $this->uploadError( wfMsgWikiHtml( 'illegalfilename', htmlspecialchars( $filtered ) ) );
 326                         return;
 327                 }
 328                 $nt =& Title::makeTitle( NS_IMAGE, $nt->getDBkey() );
 329                 $this->mUploadSaveName = $nt->getDBkey();
 330
 331                 /**
 332                  * If the image is protected, non-sysop users won't be able
 333                  * to modify it by uploading a new revision.
 334                  */
 335                 if( !$nt->userCanEdit() ) {
 336                         return $this->uploadError( wfMsgWikiHtml( 'protectedpage' ) );
 337                 }
 338
 339                 /**
 340                  * In some cases we may forbid overwriting of existing files.
 341                  */
 342                 $overwrite = $this->checkOverwrite( $this->mUploadSaveName );
 343                 if( WikiError::isError( $overwrite ) ) {
 344                         return $this->uploadError( $overwrite->toString() );
 345                 }
 346
 347                 /* Don't allow users to override the blacklist (check file extension) */
 348                 global $wgStrictFileExtensions;
 349                 global $wgFileExtensions, $wgFileBlacklist;
 350                 if( $this->checkFileExtensionList( $ext, $wgFileBlacklist ) ||
 351                         ($wgStrictFileExtensions &&
 352                                 !$this->checkFileExtension( $finalExt, $wgFileExtensions ) ) ) {
 353                         return $this->uploadError( wfMsgHtml( 'badfiletype', htmlspecialchars( $finalExt ) ) );
 354                 }
 355
 356                 /**
 357                  * Look at the contents of the file; if we can recognize the
 358                  * type but it's corrupt or data of the wrong type, we should
 359                  * probably not accept it.
 360                  */
 361                 if( !$this->mStashed ) {
 362                         $this->checkMacBinary();
 363                         $veri = $this->verify( $this->mUploadTempName, $finalExt );
 364
 365                         if( $veri !== true ) { //it's a wiki error...
 366                                 return $this->uploadError( $veri->toString() );
 367                         }
 368                 }
 369
 370                 /**
 371                  * Provide an opportunity for extensions to add futher checks
 372                  */
 373                 $error = '';
 374                 if( !wfRunHooks( 'UploadVerification',
 375                                 array( $this->mUploadSaveName, $this->mUploadTempName, &$error ) ) ) {
 376                         return $this->uploadError( $error );
 377                 }
 378
 379                 /**
 380                  * Check for non-fatal conditions
 381                  */
 382                 if ( ! $this->mIgnoreWarning ) {
 383                         $warning = '';
 384
 385                         global $wgCapitalLinks;
 386                         if( $wgCapitalLinks ) {
 387                                 $filtered = ucfirst( $filtered );
 388                         }
 389                         if( $this->mUploadSaveName != $filtered ) {
 390                                 $warning .=  '<li>'.wfMsgHtml( 'badfilename', htmlspecialchars( $this->mUploadSaveName ) ).'</li>';
 391                         }
 392
 393                         global $wgCheckFileExtensions;
 394                         if ( $wgCheckFileExtensions ) {
 395                                 if ( ! $this->checkFileExtension( $finalExt, $wgFileExtensions ) ) {
 396                                         $warning .= '<li>'.wfMsgHtml( 'badfiletype', htmlspecialchars( $finalExt ) ).'</li>';
 397                                 }
 398                         }
 399
 400                         global $wgUploadSizeWarning;
 401                         if ( $wgUploadSizeWarning && ( $this->mUploadSize > $wgUploadSizeWarning ) ) {
 402                                 $skin =& $wgUser->getSkin();
 403                                 $wsize = $skin->formatSize( $wgUploadSizeWarning );
 404                                 $asize = $skin->formatSize( $this->mUploadSize );
 405                                 $warning .= '<li>' . wfMsgHtml( 'large-file', $wsize, $asize ) . '</li>';
 406                         }
 407                         if ( $this->mUploadSize == 0 ) {
 408                                 $warning .= '<li>'.wfMsgHtml( 'emptyfile' ).'</li>';
 409                         }
 410
 411                         if( $nt->getArticleID() ) {
 412                                 global $wgUser;
 413                                 $sk = $wgUser->getSkin();
 414                                 $dlink = $sk->makeKnownLinkObj( $nt );
 415                                 $warning .= '<li>'.wfMsgHtml( 'fileexists', $dlink ).'</li>';
 416                         } else {
 417                                 # If the file existed before and was deleted, warn the user of this
 418                                 # Don't bother doing so if the image exists now, however
 419                                 $image = new Image( $nt );
 420                                 if( $image->wasDeleted() ) {
 421                                         $skin = $wgUser->getSkin();
 422                                         $ltitle = SpecialPage::getTitleFor( 'Log' );
 423                                         $llink = $skin->makeKnownLinkObj( $ltitle, wfMsgHtml( 'deletionlog' ), 'type=delete&page=' . $nt->getPrefixedUrl() );
 424                                         $warning .= wfOpenElement( 'li' ) . wfMsgWikiHtml( 'filewasdeleted', $llink ) . wfCloseElement( 'li' );
 425                                 }
 426                         }
 427
 428                         if( $warning != '' ) {
 429                                 /**
 430                                  * Stash the file in a temporary location; the user can choose
 431                                  * to let it through and we'll complete the upload then.
 432                                  */
 433                                 return $this->uploadWarning( $warning );
 434                         }
 435                 }
 436
 437                 /**
 438                  * Try actually saving the thing...
 439                  * It will show an error form on failure.
 440                  */
 441                 $hasBeenMunged = !empty( $this->mSessionKey ) || $this->mRemoveTempFile;
 442                 if( $this->saveUploadedFile( $this->mUploadSaveName,
 443                                              $this->mUploadTempName,
 444                                              $hasBeenMunged ) ) {
 445                         /**
 446                          * Update the upload log and create the description page
 447                          * if it's a new file.
 448                          */
 449                         $img = Image::newFromName( $this->mUploadSaveName );
 450                         $success = $img->recordUpload( $this->mUploadOldVersion,
 451                                                         $this->mUploadDescription,
 452                                                         $this->mLicense,
 453                                                         $this->mUploadCopyStatus,
 454                                                         $this->mUploadSource,
 455                                                         $this->mWatchthis );
 456
 457                         if ( $success ) {
 458                                 $this->showSuccess();
 459                                 wfRunHooks( 'UploadComplete', array( &$img ) );
 460                         } else {
 461                                 // Image::recordUpload() fails if the image went missing, which is
 462                                 // unlikely, hence the lack of a specialised message
 463                                 $wgOut->showFileNotFoundError( $this->mUploadSaveName );
 464                         }
 465                 }
 466         }
 467
 468         /**
 469          * Move the uploaded file from its temporary location to the final
 470          * destination. If a previous version of the file exists, move
 471          * it into the archive subdirectory.
 472          *
 473          * @todo If the later save fails, we may have disappeared the original file.
 474          *
 475          * @param string $saveName
 476          * @param string $tempName full path to the temporary file
 477          * @param bool $useRename if true, doesn't check that the source file
 478          *                        is a PHP-managed upload temporary
 479          */
 480         function saveUploadedFile( $saveName, $tempName, $useRename = false ) {
 481                 global $wgOut, $wgAllowCopyUploads;
 482
 483                 if ( !$useRename AND $wgAllowCopyUploads AND $this->mSourceType == 'web' ) $useRename = true;
 484
 485                 $fname= "SpecialUpload::saveUploadedFile";
 486
 487                 $dest = wfImageDir( $saveName );
 488                 $archive = wfImageArchiveDir( $saveName );
 489                 if ( !is_dir( $dest ) ) wfMkdirParents( $dest );
 490                 if ( !is_dir( $archive ) ) wfMkdirParents( $archive );
 491
 492                 $this->mSavedFile = "{$dest}/{$saveName}";
 493
 494                 if( is_file( $this->mSavedFile ) ) {
 495                         $this->mUploadOldVersion = gmdate( 'YmdHis' ) . "!{$saveName}";
 496                         wfSuppressWarnings();
 497                         $success = rename( $this->mSavedFile, "${archive}/{$this->mUploadOldVersion}" );
 498                         wfRestoreWarnings();
 499
 500                         if( ! $success ) {
 501                                 $wgOut->showFileRenameError( $this->mSavedFile,
 502                                   "${archive}/{$this->mUploadOldVersion}" );
 503                                 return false;
 504                         }
 505                         else wfDebug("$fname: moved file ".$this->mSavedFile." to ${archive}/{$this->mUploadOldVersion}\n");
 506                 }
 507                 else {
 508                         $this->mUploadOldVersion = '';
 509                 }
 510
 511                 wfSuppressWarnings();
 512                 $success = $useRename
 513                         ? rename( $tempName, $this->mSavedFile )
 514                         : move_uploaded_file( $tempName, $this->mSavedFile );
 515                 wfRestoreWarnings();
 516
 517                 if( ! $success ) {
 518                         $wgOut->showFileCopyError( $tempName, $this->mSavedFile );
 519                         return false;
 520                 } else {
 521                         wfDebug("$fname: wrote tempfile $tempName to ".$this->mSavedFile."\n");
 522                 }
 523
 524                 chmod( $this->mSavedFile, 0644 );
 525                 return true;
 526         }
 527
 528         /**
 529          * Stash a file in a temporary directory for later processing
 530          * after the user has confirmed it.
 531          *
 532          * If the user doesn't explicitly cancel or accept, these files
 533          * can accumulate in the temp directory.
 534          *
 535          * @param string $saveName - the destination filename
 536          * @param string $tempName - the source temporary file to save
 537          * @return string - full path the stashed file, or false on failure
 538          * @access private
 539          */
 540         function saveTempUploadedFile( $saveName, $tempName ) {
 541                 global $wgOut;
 542                 $archive = wfImageArchiveDir( $saveName, 'temp' );
 543                 if ( !is_dir ( $archive ) ) wfMkdirParents( $archive );
 544                 $stash = $archive . '/' . gmdate( "YmdHis" ) . '!' . $saveName;
 545
 546                 $success = $this->mRemoveTempFile
 547                         ? rename( $tempName, $stash )
 548                         : move_uploaded_file( $tempName, $stash );
 549                 if ( !$success ) {
 550                         $wgOut->showFileCopyError( $tempName, $stash );
 551                         return false;
 552                 }
 553
 554                 return $stash;
 555         }
 556
 557         /**
 558          * Stash a file in a temporary directory for later processing,
 559          * and save the necessary descriptive info into the session.
 560          * Returns a key value which will be passed through a form
 561          * to pick up the path info on a later invocation.
 562          *
 563          * @return int
 564          * @access private
 565          */
 566         function stashSession() {
 567                 $stash = $this->saveTempUploadedFile(
 568                         $this->mUploadSaveName, $this->mUploadTempName );
 569
 570                 if( !$stash ) {
 571                         # Couldn't save the file.
 572                         return false;
 573                 }
 574
 575                 $key = mt_rand( 0, 0x7fffffff );
 576                 $_SESSION['wsUploadData'][$key] = array(
 577                         'mUploadTempName' => $stash,
 578                         'mUploadSize'     => $this->mUploadSize,
 579                         'mOname'          => $this->mOname );
 580                 return $key;
 581         }
 582
 583         /**
 584          * Remove a temporarily kept file stashed by saveTempUploadedFile().
 585          * @access private
 586          * @return success
 587          */
 588         function unsaveUploadedFile() {
 589                 global $wgOut;
 590                 wfSuppressWarnings();
 591                 $success = unlink( $this->mUploadTempName );
 592                 wfRestoreWarnings();
 593                 if ( ! $success ) {
 594                         $wgOut->showFileDeleteError( $this->mUploadTempName );
 595                         return false;
 596                 } else {
 597                         return true;
 598                 }
 599         }
 600
 601         /* -------------------------------------------------------------- */
 602
 603         /**
 604          * Show some text and linkage on successful upload.
 605          * @access private
 606          */
 607         function showSuccess() {
 608                 global $wgUser, $wgOut, $wgContLang;
 609
 610                 $sk = $wgUser->getSkin();
 611                 $ilink = $sk->makeMediaLink( $this->mUploadSaveName, Image::imageUrl( $this->mUploadSaveName ) );
 612                 $dname = $wgContLang->getNsText( NS_IMAGE ) . ':'.$this->mUploadSaveName;
 613                 $dlink = $sk->makeKnownLink( $dname, $dname );
 614
 615                 $wgOut->addHTML( '<h2>' . wfMsgHtml( 'successfulupload' ) . "</h2>\n" );
 616                 $text = wfMsgWikiHtml( 'fileuploaded', $ilink, $dlink );
 617                 $wgOut->addHTML( $text );
 618                 $wgOut->returnToMain( false );
 619         }
 620
 621         /**
 622          * @param string $error as HTML
 623          * @access private
 624          */
 625         function uploadError( $error ) {
 626                 global $wgOut;
 627                 $wgOut->addHTML( "<h2>" . wfMsgHtml( 'uploadwarning' ) . "</h2>\n" );
 628                 $wgOut->addHTML( "<span class='error'>{$error}</span>\n" );
 629         }
 630
 631         /**
 632          * There's something wrong with this file, not enough to reject it
 633          * totally but we require manual intervention to save it for real.
 634          * Stash it away, then present a form asking to confirm or cancel.
 635          *
 636          * @param string $warning as HTML
 637          * @access private
 638          */
 639         function uploadWarning( $warning ) {
 640                 global $wgOut;
 641                 global $wgUseCopyrightUpload;
 642
 643                 $this->mSessionKey = $this->stashSession();
 644                 if( !$this->mSessionKey ) {
 645                         # Couldn't save file; an error has been displayed so let's go.
 646                         return;
 647                 }
 648
 649                 $wgOut->addHTML( "<h2>" . wfMsgHtml( 'uploadwarning' ) . "</h2>\n" );
 650                 $wgOut->addHTML( "<ul class='warning'>{$warning}</ul><br />\n" );
 651
 652                 $save = wfMsgHtml( 'savefile' );
 653                 $reupload = wfMsgHtml( 'reupload' );
 654                 $iw = wfMsgWikiHtml( 'ignorewarning' );
 655                 $reup = wfMsgWikiHtml( 'reuploaddesc' );
 656                 $titleObj = SpecialPage::getTitleFor( 'Upload' );
 657                 $action = $titleObj->escapeLocalURL( 'action=submit' );
 658
 659                 if ( $wgUseCopyrightUpload )
 660                 {
 661                         $copyright =  "
 662         <input type='hidden' name='wpUploadCopyStatus' value=\"" . htmlspecialchars( $this->mUploadCopyStatus ) . "\" />
 663         <input type='hidden' name='wpUploadSource' value=\"" . htmlspecialchars( $this->mUploadSource ) . "\" />
 664         ";
 665                 } else {
 666                         $copyright = "";
 667                 }
 668
 669                 $wgOut->addHTML( "
 670         <form id='uploadwarning' method='post' enctype='multipart/form-data' action='$action'>
 671                 <input type='hidden' name='wpIgnoreWarning' value='1' />
 672                 <input type='hidden' name='wpSessionKey' value=\"" . htmlspecialchars( $this->mSessionKey ) . "\" />
 673                 <input type='hidden' name='wpUploadDescription' value=\"" . htmlspecialchars( $this->mUploadDescription ) . "\" />
 674                 <input type='hidden' name='wpLicense' value=\"" . htmlspecialchars( $this->mLicense ) . "\" />
 675                 <input type='hidden' name='wpDestFile' value=\"" . htmlspecialchars( $this->mDestFile ) . "\" />
 676                 <input type='hidden' name='wpWatchthis' value=\"" . htmlspecialchars( intval( $this->mWatchthis ) ) . "\" />
 677         {$copyright}
 678         <table border='0'>
 679                 <tr>
 680                         <tr>
 681                                 <td align='right'>
 682                                         <input tabindex='2' type='submit' name='wpUpload' value=\"$save\" />
 683                                 </td>
 684                                 <td align='left'>$iw</td>
 685                         </tr>
 686                         <tr>
 687                                 <td align='right'>
 688                                         <input tabindex='2' type='submit' name='wpReUpload' value=\"{$reupload}\" />
 689                                 </td>
 690                                 <td align='left'>$reup</td>
 691                         </tr>
 692                 </tr>
 693         </table></form>\n" );
 694         }
 695
 696         /**
 697          * Displays the main upload form, optionally with a highlighted
 698          * error message up at the top.
 699          *
 700          * @param string $msg as HTML
 701          * @access private
 702          */
 703         function mainUploadForm( $msg='' ) {
 704                 global $wgOut, $wgUser;
 705                 global $wgUseCopyrightUpload;
 706                 global $wgRequest, $wgAllowCopyUploads;
 707
 708                 if( !wfRunHooks( 'UploadForm:initial', array( &$this ) ) )
 709                 {
 710                         wfDebug( "Hook 'UploadForm:initial' broke output of the upload form" );
 711                         return false;
 712                 }
 713
 714                 $cols = intval($wgUser->getOption( 'cols' ));
 715                 $ew = $wgUser->getOption( 'editwidth' );
 716                 if ( $ew ) $ew = " style=\"width:100%\"";
 717                 else $ew = '';
 718
 719                 if ( '' != $msg ) {
 720                         $sub = wfMsgHtml( 'uploaderror' );
 721                         $wgOut->addHTML( "<h2>{$sub}</h2>\n" .
 722                           "<span class='error'>{$msg}</span>\n" );
 723                 }
 724                 $wgOut->addHTML( '<div id="uploadtext">' );
 725                 $wgOut->addWikiText( wfMsg( 'uploadtext' ) );
 726                 $wgOut->addHTML( '</div>' );
 727
 728                 $sourcefilename = wfMsgHtml( 'sourcefilename' );
 729                 $destfilename = wfMsgHtml( 'destfilename' );
 730                 $summary = wfMsgWikiHtml( 'fileuploadsummary' );
 731
 732                 $licenses = new Licenses();
 733                 $license = wfMsgHtml( 'license' );
 734                 $nolicense = wfMsgHtml( 'nolicense' );
 735                 $licenseshtml = $licenses->getHtml();
 736
 737                 $ulb = wfMsgHtml( 'uploadbtn' );
 738
 739
 740                 $titleObj = SpecialPage::getTitleFor( 'Upload' );
 741                 $action = $titleObj->escapeLocalURL();
 742
 743                 $encDestFile = htmlspecialchars( $this->mDestFile );
 744
 745                 $watchChecked =
 746                         ( $wgUser->getOption( 'watchdefault' ) ||
 747                                 ( $wgUser->getOption( 'watchcreations' ) && $this->mDestFile == '' ) )
 748                         ? 'checked="checked"'
 749                         : '';
 750
 751                 // Prepare form for upload or upload/copy
 752                 if( $wgAllowCopyUploads && $wgUser->isAllowed( 'upload_by_url' ) ) {
 753                         $filename_form =
 754                                 "<input type='radio' id='wpSourceTypeFile' name='wpSourceType' value='file' onchange='toggle_element_activation(\"wpUploadFileURL\",\"wpUploadFile\")' checked />" .
 755                                 "<input tabindex='1' type='file' name='wpUploadFile' id='wpUploadFile' onfocus='toggle_element_activation(\"wpUploadFileURL\",\"wpUploadFile\");toggle_element_check(\"wpSourceTypeFile\",\"wpSourceTypeURL\")'" .
 756                                 ($this->mDestFile?"":"onchange='fillDestFilename(\"wpUploadFile\")' ") . "size='40' />" .
 757                                 wfMsgHTML( 'upload_source_file' ) . "<br/>" .
 758                                 "<input type='radio' id='wpSourceTypeURL' name='wpSourceType' value='web' onchange='toggle_element_activation(\"wpUploadFile\",\"wpUploadFileURL\")' />" .
 759                                 "<input tabindex='1' type='text' name='wpUploadFileURL' id='wpUploadFileURL' onfocus='toggle_element_activation(\"wpUploadFile\",\"wpUploadFileURL\");toggle_element_check(\"wpSourceTypeURL\",\"wpSourceTypeFile\")'" .
 760                                 ($this->mDestFile?"":"onchange='fillDestFilename(\"wpUploadFileURL\")' ") . "size='40' DISABLED />" .
 761                                 wfMsgHtml( 'upload_source_url' ) ;
 762                 } else {
 763                         $filename_form =
 764                                 "<input tabindex='1' type='file' name='wpUploadFile' id='wpUploadFile' " .
 765                                 ($this->mDestFile?"":"onchange='fillDestFilename(\"wpUploadFile\")' ") .
 766                                 "size='40' />" .
 767                                 "<input type='hidden' name='wpSourceType' value='file' />" ;
 768                 }
 769
 770                 $wgOut->addHTML( "
 771         <form id='upload' method='post' enctype='multipart/form-data' action=\"$action\">
 772                 <table border='0'>
 773                 <tr>
 774           {$this->uploadFormTextTop}
 775                         <td align='right' valign='top'><label for='wpUploadFile'>{$sourcefilename}:</label></td>
 776                         <td align='left'>
 777                                 {$filename_form}
 778                         </td>
 779                 </tr>
 780                 <tr>
 781                         <td align='right'><label for='wpDestFile'>{$destfilename}:</label></td>
 782                         <td align='left'>
 783                                 <input tabindex='2' type='text' name='wpDestFile' id='wpDestFile' size='40' value=\"$encDestFile\" />
 784                         </td>
 785                 </tr>
 786                 <tr>
 787                         <td align='right'><label for='wpUploadDescription'>{$summary}</label></td>
 788                         <td align='left'>
 789                                 <textarea tabindex='3' name='wpUploadDescription' id='wpUploadDescription' rows='6' cols='{$cols}'{$ew}>" . htmlspecialchars( $this->mUploadDescription ) . "</textarea>
 790            {$this->uploadFormTextAfterSummary}
 791                         </td>
 792                 </tr>
 793                 <tr>" );
 794
 795                 if ( $licenseshtml != '' ) {
 796                         global $wgStylePath;
 797                         $wgOut->addHTML( "
 798                         <td align='right'><label for='wpLicense'>$license:</label></td>
 799                         <td align='left'>
 800                                 <script type='text/javascript' src=\"$wgStylePath/common/upload.js\"></script>
 801                                 <select name='wpLicense' id='wpLicense' tabindex='4'
 802                                         onchange='licenseSelectorCheck()'>
 803                                         <option value=''>$nolicense</option>
 804                                         $licenseshtml
 805                                 </select>
 806                         </td>
 807                         </tr>
 808                         <tr>
 809                 ");
 810                 }
 811
 812                 if ( $wgUseCopyrightUpload ) {
 813                         $filestatus = wfMsgHtml ( 'filestatus' );
 814                         $copystatus =  htmlspecialchars( $this->mUploadCopyStatus );
 815                         $filesource = wfMsgHtml ( 'filesource' );
 816                         $uploadsource = htmlspecialchars( $this->mUploadSource );
 817
 818                         $wgOut->addHTML( "
 819                                 <td align='right' nowrap='nowrap'><label for='wpUploadCopyStatus'>$filestatus:</label></td>
 820                                 <td><input tabindex='5' type='text' name='wpUploadCopyStatus' id='wpUploadCopyStatus' value=\"$copystatus\" size='40' /></td>
 821                         </tr>
 822                         <tr>
 823                                 <td align='right'><label for='wpUploadCopyStatus'>$filesource:</label></td>
 824                                 <td><input tabindex='6' type='text' name='wpUploadSource' id='wpUploadCopyStatus' value=\"$uploadsource\" size='40' /></td>
 825                         </tr>
 826                         <tr>
 827                 ");
 828                 }
 829
 830
 831                 $wgOut->addHtml( "
 832                 <td></td>
 833                 <td>
 834                         <input tabindex='7' type='checkbox' name='wpWatchthis' id='wpWatchthis' $watchChecked value='true' />
 835                         <label for='wpWatchthis'>" . wfMsgHtml( 'watchthisupload' ) . "</label>
 836                         <input tabindex='8' type='checkbox' name='wpIgnoreWarning' id='wpIgnoreWarning' value='true' />
 837                         <label for='wpIgnoreWarning'>" . wfMsgHtml( 'ignorewarnings' ) . "</label>
 838                 </td>
 839         </tr>
 840         <tr>
 841                 <td></td>
 842                 <td align='left'><input tabindex='9' type='submit' name='wpUpload' value=\"{$ulb}\" /></td>
 843         </tr>
 844
 845         <tr>
 846                 <td></td>
 847                 <td align='left'>
 848                 " );
 849                 $wgOut->addWikiText( wfMsgForContent( 'edittools' ) );
 850                 $wgOut->addHTML( "
 851                 </td>
 852         </tr>
 853
 854         </table>
 855         </form>" );
 856         }
 857
 858         /* -------------------------------------------------------------- */
 859
 860         /**
 861          * Split a file into a base name and all dot-delimited 'extensions'
 862          * on the end. Some web server configurations will fall back to
 863          * earlier pseudo-'extensions' to determine type and execute
 864          * scripts, so the blacklist needs to check them all.
 865          *
 866          * @return array
 867          */
 868         function splitExtensions( $filename ) {
 869                 $bits = explode( '.', $filename );
 870                 $basename = array_shift( $bits );
 871                 return array( $basename, $bits );
 872         }
 873
 874         /**
 875          * Perform case-insensitive match against a list of file extensions.
 876          * Returns true if the extension is in the list.
 877          *
 878          * @param string $ext
 879          * @param array $list
 880          * @return bool
 881          */
 882         function checkFileExtension( $ext, $list ) {
 883                 return in_array( strtolower( $ext ), $list );
 884         }
 885
 886         /**
 887          * Perform case-insensitive match against a list of file extensions.
 888          * Returns true if any of the extensions are in the list.
 889          *
 890          * @param array $ext
 891          * @param array $list
 892          * @return bool
 893          */
 894         function checkFileExtensionList( $ext, $list ) {
 895                 foreach( $ext as $e ) {
 896                         if( in_array( strtolower( $e ), $list ) ) {
 897                                 return true;
 898                         }
 899                 }
 900                 return false;
 901         }
 902
 903         /**
 904          * Verifies that it's ok to include the uploaded file
 905          *
 906          * @param string $tmpfile the full path of the temporary file to verify
 907          * @param string $extension The filename extension that the file is to be served with
 908          * @return mixed true of the file is verified, a WikiError object otherwise.
 909          */
 910         function verify( $tmpfile, $extension ) {
 911                 #magically determine mime type
 912                 $magic=& MimeMagic::singleton();
 913                 $mime= $magic->guessMimeType($tmpfile,false);
 914
 915                 $fname= "SpecialUpload::verify";
 916
 917                 #check mime type, if desired
 918                 global $wgVerifyMimeType;
 919                 if ($wgVerifyMimeType) {
 920
 921                         #check mime type against file extension
 922                         if( !$this->verifyExtension( $mime, $extension ) ) {
 923                                 return new WikiErrorMsg( 'uploadcorrupt' );
 924                         }
 925
 926                         #check mime type blacklist
 927                         global $wgMimeTypeBlacklist;
 928                         if( isset($wgMimeTypeBlacklist) && !is_null($wgMimeTypeBlacklist)
 929                                 && $this->checkFileExtension( $mime, $wgMimeTypeBlacklist ) ) {
 930                                 return new WikiErrorMsg( 'badfiletype', htmlspecialchars( $mime ) );
 931                         }
 932                 }
 933
 934                 #check for htmlish code and javascript
 935                 if( $this->detectScript ( $tmpfile, $mime, $extension ) ) {
 936                         return new WikiErrorMsg( 'uploadscripted' );
 937                 }
 938
 939                 /**
 940                 * Scan the uploaded file for viruses
 941                 */
 942                 $virus= $this->detectVirus($tmpfile);
 943                 if ( $virus ) {
 944                         return new WikiErrorMsg( 'uploadvirus', htmlspecialchars($virus) );
 945                 }
 946
 947                 wfDebug( "$fname: all clear; passing.\n" );
 948                 return true;
 949         }
 950
 951         /**
 952          * Checks if the mime type of the uploaded file matches the file extension.
 953          *
 954          * @param string $mime the mime type of the uploaded file
 955          * @param string $extension The filename extension that the file is to be served with
 956          * @return bool
 957          */
 958         function verifyExtension( $mime, $extension ) {
 959                 $fname = 'SpecialUpload::verifyExtension';
 960
 961                 $magic =& MimeMagic::singleton();
 962
 963                 if ( ! $mime || $mime == 'unknown' || $mime == 'unknown/unknown' )
 964                         if ( ! $magic->isRecognizableExtension( $extension ) ) {
 965                                 wfDebug( "$fname: passing file with unknown detected mime type; unrecognized extension '$extension', can't verify\n" );
 966                                 return true;
 967                         } else {
 968                                 wfDebug( "$fname: rejecting file with unknown detected mime type; recognized extension '$extension', so probably invalid file\n" );
 969                                 return false;
 970                         }
 971
 972                 $match= $magic->isMatchingExtension($extension,$mime);
 973
 974                 if ($match===NULL) {
 975                         wfDebug( "$fname: no file extension known for mime type $mime, passing file\n" );
 976                         return true;
 977                 } elseif ($match===true) {
 978                         wfDebug( "$fname: mime type $mime matches extension $extension, passing file\n" );
 979
 980                         #TODO: if it's a bitmap, make sure PHP or ImageMagic resp. can handle it!
 981                         return true;
 982
 983                 } else {
 984                         wfDebug( "$fname: mime type $mime mismatches file extension $extension, rejecting file\n" );
 985                         return false;
 986                 }
 987         }
 988
 989         /** Heuristig for detecting files that *could* contain JavaScript instructions or
 990         * things that may look like HTML to a browser and are thus
 991         * potentially harmful. The present implementation will produce false positives in some situations.
 992         *
 993         * @param string $file Pathname to the temporary upload file
 994         * @param string $mime The mime type of the file
 995         * @param string $extension The extension of the file
 996         * @return bool true if the file contains something looking like embedded scripts
 997         */
 998         function detectScript($file, $mime, $extension) {
 999                 global $wgAllowTitlesInSVG;
1000
1001                 #ugly hack: for text files, always look at the entire file.
1002                 #For binarie field, just check the first K.
1003
1004                 if (strpos($mime,'text/')===0) $chunk = file_get_contents( $file );
1005                 else {
1006                         $fp = fopen( $file, 'rb' );
1007                         $chunk = fread( $fp, 1024 );
1008                         fclose( $fp );
1009                 }
1010
1011                 $chunk= strtolower( $chunk );
1012
1013                 if (!$chunk) return false;
1014
1015                 #decode from UTF-16 if needed (could be used for obfuscation).
1016                 if (substr($chunk,0,2)=="\xfe\xff") $enc= "UTF-16BE";
1017                 elseif (substr($chunk,0,2)=="\xff\xfe") $enc= "UTF-16LE";
1018                 else $enc= NULL;
1019
1020                 if ($enc) $chunk= iconv($enc,"ASCII//IGNORE",$chunk);
1021
1022                 $chunk= trim($chunk);
1023
1024                 #FIXME: convert from UTF-16 if necessarry!
1025
1026                 wfDebug("SpecialUpload::detectScript: checking for embedded scripts and HTML stuff\n");
1027
1028                 #check for HTML doctype
1029                 if (eregi("<!DOCTYPE *X?HTML",$chunk)) return true;
1030
1031                 /**
1032                 * Internet Explorer for Windows performs some really stupid file type
1033                 * autodetection which can cause it to interpret valid image files as HTML
1034                 * and potentially execute JavaScript, creating a cross-site scripting
1035                 * attack vectors.
1036                 *
1037                 * Apple's Safari browser also performs some unsafe file type autodetection
1038                 * which can cause legitimate files to be interpreted as HTML if the
1039                 * web server is not correctly configured to send the right content-type
1040                 * (or if you're really uploading plain text and octet streams!)
1041                 *
1042                 * Returns true if IE is likely to mistake the given file for HTML.
1043                 * Also returns true if Safari would mistake the given file for HTML
1044                 * when served with a generic content-type.
1045                 */
1046
1047                 $tags = array(
1048                         '<body',
1049                         '<head',
1050                         '<html',   #also in safari
1051                         '<img',
1052                         '<pre',
1053                         '<script', #also in safari
1054                         '<table'
1055                         );
1056                 if( ! $wgAllowTitlesInSVG && $extension !== 'svg' && $mime !== 'image/svg' ) {
1057                         $tags[] = '<title';
1058                 }
1059
1060                 foreach( $tags as $tag ) {
1061                         if( false !== strpos( $chunk, $tag ) ) {
1062                                 return true;
1063                         }
1064                 }
1065
1066                 /*
1067                 * look for javascript
1068                 */
1069
1070                 #resolve entity-refs to look at attributes. may be harsh on big files... cache result?
1071                 $chunk = Sanitizer::decodeCharReferences( $chunk );
1072
1073                 #look for script-types
1074                 if (preg_match('!type\s*=\s*[\'"]?\s*(\w*/)?(ecma|java)!sim',$chunk)) return true;
1075
1076                 #look for html-style script-urls
1077                 if (preg_match('!(href|src|data)\s*=\s*[\'"]?\s*(ecma|java)script:!sim',$chunk)) return true;
1078
1079                 #look for css-style script-urls
1080                 if (preg_match('!url\s*\(\s*[\'"]?\s*(ecma|java)script:!sim',$chunk)) return true;
1081
1082                 wfDebug("SpecialUpload::detectScript: no scripts found\n");
1083                 return false;
1084         }
1085
1086         /** Generic wrapper function for a virus scanner program.
1087         * This relies on the $wgAntivirus and $wgAntivirusSetup variables.
1088         * $wgAntivirusRequired may be used to deny upload if the scan fails.
1089         *
1090         * @param string $file Pathname to the temporary upload file
1091         * @return mixed false if not virus is found, NULL if the scan fails or is disabled,
1092         *         or a string containing feedback from the virus scanner if a virus was found.
1093         *         If textual feedback is missing but a virus was found, this function returns true.
1094         */
1095         function detectVirus($file) {
1096                 global $wgAntivirus, $wgAntivirusSetup, $wgAntivirusRequired, $wgOut;
1097
1098                 $fname= "SpecialUpload::detectVirus";
1099
1100                 if (!$wgAntivirus) { #disabled?
1101                         wfDebug("$fname: virus scanner disabled\n");
1102
1103                         return NULL;
1104                 }
1105
1106                 if (!$wgAntivirusSetup[$wgAntivirus]) {
1107                         wfDebug("$fname: unknown virus scanner: $wgAntivirus\n");
1108
1109                         $wgOut->addHTML( "<div class='error'>Bad configuration: unknown virus scanner: <i>$wgAntivirus</i></div>\n" ); #LOCALIZE
1110
1111                         return "unknown antivirus: $wgAntivirus";
1112                 }
1113
1114                 #look up scanner configuration
1115                 $virus_scanner= $wgAntivirusSetup[$wgAntivirus]["command"]; #command pattern
1116                 $virus_scanner_codes= $wgAntivirusSetup[$wgAntivirus]["codemap"]; #exit-code map
1117                 $msg_pattern= $wgAntivirusSetup[$wgAntivirus]["messagepattern"]; #message pattern
1118
1119                 $scanner= $virus_scanner; #copy, so we can resolve the pattern
1120
1121                 if (strpos($scanner,"%f")===false) $scanner.= " ".wfEscapeShellArg($file); #simple pattern: append file to scan
1122                 else $scanner= str_replace("%f",wfEscapeShellArg($file),$scanner); #complex pattern: replace "%f" with file to scan
1123
1124                 wfDebug("$fname: running virus scan: $scanner \n");
1125
1126                 #execute virus scanner
1127                 $code= false;
1128
1129                 #NOTE: there's a 50 line workaround to make stderr redirection work on windows, too.
1130                 #      that does not seem to be worth the pain.
1131                 #      Ask me (Duesentrieb) about it if it's ever needed.
1132                 $output = array();
1133                 if (wfIsWindows()) exec("$scanner",$output,$code);
1134                 else exec("$scanner 2>&1",$output,$code);
1135
1136                 $exit_code= $code; #remember for user feedback
1137
1138                 if ($virus_scanner_codes) { #map exit code to AV_xxx constants.
1139                         if (isset($virus_scanner_codes[$code])) {
1140                                 $code= $virus_scanner_codes[$code]; # explicit mapping
1141                         } else if (isset($virus_scanner_codes["*"])) {
1142                                 $code= $virus_scanner_codes["*"];   # fallback mapping
1143                         }
1144                 }
1145
1146                 if ($code===AV_SCAN_FAILED) { #scan failed (code was mapped to false by $virus_scanner_codes)
1147                         wfDebug("$fname: failed to scan $file (code $exit_code).\n");
1148
1149                         if ($wgAntivirusRequired) { return "scan failed (code $exit_code)"; }
1150                         else { return NULL; }
1151                 }
1152                 else if ($code===AV_SCAN_ABORTED) { #scan failed because filetype is unknown (probably imune)
1153                         wfDebug("$fname: unsupported file type $file (code $exit_code).\n");
1154                         return NULL;
1155                 }
1156                 else if ($code===AV_NO_VIRUS) {
1157                         wfDebug("$fname: file passed virus scan.\n");
1158                         return false; #no virus found
1159                 }
1160                 else {
1161                         $output= join("\n",$output);
1162                         $output= trim($output);
1163
1164                         if (!$output) $output= true; #if there's no output, return true
1165                         else if ($msg_pattern) {
1166                                 $groups= array();
1167                                 if (preg_match($msg_pattern,$output,$groups)) {
1168                                         if ($groups[1]) $output= $groups[1];
1169                                 }
1170                         }
1171
1172                         wfDebug("$fname: FOUND VIRUS! scanner feedback: $output");
1173                         return $output;
1174                 }
1175         }
1176
1177         /**
1178          * Check if the temporary file is MacBinary-encoded, as some uploads
1179          * from Internet Explorer on Mac OS Classic and Mac OS X will be.
1180          * If so, the data fork will be extracted to a second temporary file,
1181          * which will then be checked for validity and either kept or discarded.
1182          *
1183          * @access private
1184          */
1185         function checkMacBinary() {
1186                 $macbin = new MacBinary( $this->mUploadTempName );
1187                 if( $macbin->isValid() ) {
1188                         $dataFile = tempnam( wfTempDir(), "WikiMacBinary" );
1189                         $dataHandle = fopen( $dataFile, 'wb' );
1190
1191                         wfDebug( "SpecialUpload::checkMacBinary: Extracting MacBinary data fork to $dataFile\n" );
1192                         $macbin->extractData( $dataHandle );
1193
1194                         $this->mUploadTempName = $dataFile;
1195                         $this->mUploadSize = $macbin->dataForkLength();
1196
1197                         // We'll have to manually remove the new file if it's not kept.
1198                         $this->mRemoveTempFile = true;
1199                 }
1200                 $macbin->close();
1201         }
1202
1203         /**
1204          * If we've modified the upload file we need to manually remove it
1205          * on exit to clean up.
1206          * @access private
1207          */
1208         function cleanupTempFile() {
1209                 if( $this->mRemoveTempFile && file_exists( $this->mUploadTempName ) ) {
1210                         wfDebug( "SpecialUpload::cleanupTempFile: Removing temporary file $this->mUploadTempName\n" );
1211                         unlink( $this->mUploadTempName );
1212                 }
1213         }
1214
1215         /**
1216          * Check if there's an overwrite conflict and, if so, if restrictions
1217          * forbid this user from performing the upload.
1218          *
1219          * @return mixed true on success, WikiError on failure
1220          * @access private
1221          */
1222         function checkOverwrite( $name ) {
1223                 $img = Image::newFromName( $name );
1224                 if( is_null( $img ) ) {
1225                         // Uh... this shouldn't happen ;)
1226                         // But if it does, fall through to previous behavior
1227                         return false;
1228                 }
1229
1230                 $error = '';
1231                 if( $img->exists() ) {
1232                         global $wgUser, $wgOut;
1233                         if( $img->isLocal() ) {
1234                                 if( !$wgUser->isAllowed( 'reupload' ) ) {
1235                                         $error = 'fileexists-forbidden';
1236                                 }
1237                         } else {
1238                                 if( !$wgUser->isAllowed( 'reupload' ) ||
1239                                     !$wgUser->isAllowed( 'reupload-shared' ) ) {
1240                                         $error = "fileexists-shared-forbidden";
1241                                 }
1242                         }
1243                 }
1244
1245                 if( $error ) {
1246                         $errorText = wfMsg( $error, wfEscapeWikiText( $img->getName() ) );
1247                         return new WikiError( $wgOut->parse( $errorText ) );
1248                 }
1249
1250                 // Rockin', go ahead and upload
1251                 return true;
1252         }
1253
1254 }
1255 ?>