includes/SpecialUpload.php

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