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