includes/SpecialUpload.php

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