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