includes/SpecialUpload.php

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