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                         }
 302
 303                         if( $warning != '' ) {
 304                                 /**
 305                                  * Stash the file in a temporary location; the user can choose
 306                                  * to let it through and we'll complete the upload then.
 307                                  */
 308                                 return $this->uploadWarning( $warning );
 309                         }
 310                 }
 311
 312                 /**
 313                  * Try actually saving the thing...
 314                  * It will show an error form on failure.
 315                  */
 316                 $hasBeenMunged = !empty( $this->mSessionKey ) || $this->mRemoveTempFile;
 317                 if( $this->saveUploadedFile( $this->mUploadSaveName,
 318                                              $this->mUploadTempName,
 319                                              $hasBeenMunged ) ) {
 320                         /**
 321                          * Update the upload log and create the description page
 322                          * if it's a new file.
 323                          */
 324                         $img = Image::newFromName( $this->mUploadSaveName );
 325                         $success = $img->recordUpload( $this->mUploadOldVersion,
 326                                                         $this->mUploadDescription,
 327                                                         $this->mLicense,
 328                                                         $this->mUploadCopyStatus,
 329                                                         $this->mUploadSource,
 330                                                         $this->mWatchthis );
 331
 332                         if ( $success ) {
 333                                 $this->showSuccess();
 334                         } else {
 335                                 // Image::recordUpload() fails if the image went missing, which is
 336                                 // unlikely, hence the lack of a specialised message
 337                                 $wgOut->fileNotFoundError( $this->mUploadSaveName );
 338                         }
 339                 }
 340         }
 341
 342         /**
 343          * Move the uploaded file from its temporary location to the final
 344          * destination. If a previous version of the file exists, move
 345          * it into the archive subdirectory.
 346          *
 347          * @todo If the later save fails, we may have disappeared the original file.
 348          *
 349          * @param string $saveName
 350          * @param string $tempName full path to the temporary file
 351          * @param bool $useRename if true, doesn't check that the source file
 352          *                        is a PHP-managed upload temporary
 353          */
 354         function saveUploadedFile( $saveName, $tempName, $useRename = false ) {
 355                 global $wgOut;
 356
 357                 $fname= "SpecialUpload::saveUploadedFile";
 358
 359                 $dest = wfImageDir( $saveName );
 360                 $archive = wfImageArchiveDir( $saveName );
 361                 $this->mSavedFile = "{$dest}/{$saveName}";
 362
 363                 if( is_file( $this->mSavedFile ) ) {
 364                         $this->mUploadOldVersion = gmdate( 'YmdHis' ) . "!{$saveName}";
 365                         wfSuppressWarnings();
 366                         $success = rename( $this->mSavedFile, "${archive}/{$this->mUploadOldVersion}" );
 367                         wfRestoreWarnings();
 368
 369                         if( ! $success ) {
 370                                 $wgOut->fileRenameError( $this->mSavedFile,
 371                                   "${archive}/{$this->mUploadOldVersion}" );
 372                                 return false;
 373                         }
 374                         else wfDebug("$fname: moved file ".$this->mSavedFile." to ${archive}/{$this->mUploadOldVersion}\n");
 375                 }
 376                 else {
 377                         $this->mUploadOldVersion = '';
 378                 }
 379
 380                 wfSuppressWarnings();
 381                 $success = $useRename
 382                         ? rename( $tempName, $this->mSavedFile )
 383                         : move_uploaded_file( $tempName, $this->mSavedFile );
 384                 wfRestoreWarnings();
 385
 386                 if( ! $success ) {
 387                         $wgOut->fileCopyError( $tempName, $this->mSavedFile );
 388                         return false;
 389                 } else {
 390                         wfDebug("$fname: wrote tempfile $tempName to ".$this->mSavedFile."\n");
 391                 }
 392
 393                 chmod( $this->mSavedFile, 0644 );
 394                 return true;
 395         }
 396
 397         /**
 398          * Stash a file in a temporary directory for later processing
 399          * after the user has confirmed it.
 400          *
 401          * If the user doesn't explicitly cancel or accept, these files
 402          * can accumulate in the temp directory.
 403          *
 404          * @param string $saveName - the destination filename
 405          * @param string $tempName - the source temporary file to save
 406          * @return string - full path the stashed file, or false on failure
 407          * @access private
 408          */
 409         function saveTempUploadedFile( $saveName, $tempName ) {
 410                 global $wgOut;
 411                 $archive = wfImageArchiveDir( $saveName, 'temp' );
 412                 $stash = $archive . '/' . gmdate( "YmdHis" ) . '!' . $saveName;
 413
 414                 $success = $this->mRemoveTempFile
 415                         ? rename( $tempName, $stash )
 416                         : move_uploaded_file( $tempName, $stash );
 417                 if ( !$success ) {
 418                         $wgOut->fileCopyError( $tempName, $stash );
 419                         return false;
 420                 }
 421
 422                 return $stash;
 423         }
 424
 425         /**
 426          * Stash a file in a temporary directory for later processing,
 427          * and save the necessary descriptive info into the session.
 428          * Returns a key value which will be passed through a form
 429          * to pick up the path info on a later invocation.
 430          *
 431          * @return int
 432          * @access private
 433          */
 434         function stashSession() {
 435                 $stash = $this->saveTempUploadedFile(
 436                         $this->mUploadSaveName, $this->mUploadTempName );
 437
 438                 if( !$stash ) {
 439                         # Couldn't save the file.
 440                         return false;
 441                 }
 442
 443                 $key = mt_rand( 0, 0x7fffffff );
 444                 $_SESSION['wsUploadData'][$key] = array(
 445                         'mUploadTempName' => $stash,
 446                         'mUploadSize'     => $this->mUploadSize,
 447                         'mOname'          => $this->mOname );
 448                 return $key;
 449         }
 450
 451         /**
 452          * Remove a temporarily kept file stashed by saveTempUploadedFile().
 453          * @access private
 454          */
 455         function unsaveUploadedFile() {
 456                 global $wgOut;
 457                 wfSuppressWarnings();
 458                 $success = unlink( $this->mUploadTempName );
 459                 wfRestoreWarnings();
 460                 if ( ! $success ) {
 461                         $wgOut->fileDeleteError( $this->mUploadTempName );
 462                 }
 463         }
 464
 465         /* -------------------------------------------------------------- */
 466
 467         /**
 468          * Show some text and linkage on successful upload.
 469          * @access private
 470          */
 471         function showSuccess() {
 472                 global $wgUser, $wgOut, $wgContLang;
 473
 474                 $sk = $wgUser->getSkin();
 475                 $ilink = $sk->makeMediaLink( $this->mUploadSaveName, Image::imageUrl( $this->mUploadSaveName ) );
 476                 $dname = $wgContLang->getNsText( NS_IMAGE ) . ':'.$this->mUploadSaveName;
 477                 $dlink = $sk->makeKnownLink( $dname, $dname );
 478
 479                 $wgOut->addHTML( '<h2>' . wfMsgHtml( 'successfulupload' ) . "</h2>\n" );
 480                 $text = wfMsgWikiHtml( 'fileuploaded', $ilink, $dlink );
 481                 $wgOut->addHTML( $text );
 482                 $wgOut->returnToMain( false );
 483         }
 484
 485         /**
 486          * @param string $error as HTML
 487          * @access private
 488          */
 489         function uploadError( $error ) {
 490                 global $wgOut;
 491                 $wgOut->addHTML( "<h2>" . wfMsgHtml( 'uploadwarning' ) . "</h2>\n" );
 492                 $wgOut->addHTML( "<span class='error'>{$error}</span>\n" );
 493         }
 494
 495         /**
 496          * There's something wrong with this file, not enough to reject it
 497          * totally but we require manual intervention to save it for real.
 498          * Stash it away, then present a form asking to confirm or cancel.
 499          *
 500          * @param string $warning as HTML
 501          * @access private
 502          */
 503         function uploadWarning( $warning ) {
 504                 global $wgOut;
 505                 global $wgUseCopyrightUpload;
 506
 507                 $this->mSessionKey = $this->stashSession();
 508                 if( !$this->mSessionKey ) {
 509                         # Couldn't save file; an error has been displayed so let's go.
 510                         return;
 511                 }
 512
 513                 $wgOut->addHTML( "<h2>" . wfMsgHtml( 'uploadwarning' ) . "</h2>\n" );
 514                 $wgOut->addHTML( "<ul class='warning'>{$warning}</ul><br />\n" );
 515
 516                 $save = wfMsgHtml( 'savefile' );
 517                 $reupload = wfMsgHtml( 'reupload' );
 518                 $iw = wfMsgWikiHtml( 'ignorewarning' );
 519                 $reup = wfMsgWikiHtml( 'reuploaddesc' );
 520                 $titleObj = Title::makeTitle( NS_SPECIAL, 'Upload' );
 521                 $action = $titleObj->escapeLocalURL( 'action=submit' );
 522
 523                 if ( $wgUseCopyrightUpload )
 524                 {
 525                         $copyright =  "
 526         <input type='hidden' name='wpUploadCopyStatus' value=\"" . htmlspecialchars( $this->mUploadCopyStatus ) . "\" />
 527         <input type='hidden' name='wpUploadSource' value=\"" . htmlspecialchars( $this->mUploadSource ) . "\" />
 528         ";
 529                 } else {
 530                         $copyright = "";
 531                 }
 532
 533                 $wgOut->addHTML( "
 534         <form id='uploadwarning' method='post' enctype='multipart/form-data' action='$action'>
 535                 <input type='hidden' name='wpIgnoreWarning' value='1' />
 536                 <input type='hidden' name='wpSessionKey' value=\"" . htmlspecialchars( $this->mSessionKey ) . "\" />
 537                 <input type='hidden' name='wpUploadDescription' value=\"" . htmlspecialchars( $this->mUploadDescription ) . "\" />
 538                 <input type='hidden' name='wpLicense' value=\"" . htmlspecialchars( $this->mLicense ) . "\" />
 539                 <input type='hidden' name='wpDestFile' value=\"" . htmlspecialchars( $this->mDestFile ) . "\" />
 540                 <input type='hidden' name='wpWatchthis' value=\"" . htmlspecialchars( intval( $this->mWatchthis ) ) . "\" />
 541         {$copyright}
 542         <table border='0'>
 543                 <tr>
 544                         <tr>
 545                                 <td align='right'>
 546                                         <input tabindex='2' type='submit' name='wpUpload' value='$save' />
 547                                 </td>
 548                                 <td align='left'>$iw</td>
 549                         </tr>
 550                         <tr>
 551                                 <td align='right'>
 552                                         <input tabindex='2' type='submit' name='wpReUpload' value='{$reupload}' />
 553                                 </td>
 554                                 <td align='left'>$reup</td>
 555                         </tr>
 556                 </tr>
 557         </table></form>\n" );
 558         }
 559
 560         /**
 561          * Displays the main upload form, optionally with a highlighted
 562          * error message up at the top.
 563          *
 564          * @param string $msg as HTML
 565          * @access private
 566          */
 567         function mainUploadForm( $msg='' ) {
 568                 global $wgOut, $wgUser;
 569                 global $wgUseCopyrightUpload;
 570
 571                 $cols = intval($wgUser->getOption( 'cols' ));
 572                 $ew = $wgUser->getOption( 'editwidth' );
 573                 if ( $ew ) $ew = " style=\"width:100%\"";
 574                 else $ew = '';
 575
 576                 if ( '' != $msg ) {
 577                         $sub = wfMsgHtml( 'uploaderror' );
 578                         $wgOut->addHTML( "<h2>{$sub}</h2>\n" .
 579                           "<span class='error'>{$msg}</span>\n" );
 580                 }
 581                 $wgOut->addHTML( '<div id="uploadtext">' );
 582                 $wgOut->addWikiText( wfMsg( 'uploadtext' ) );
 583                 $wgOut->addHTML( '</div>' );
 584                 $sk = $wgUser->getSkin();
 585
 586
 587                 $sourcefilename = wfMsgHtml( 'sourcefilename' );
 588                 $destfilename = wfMsgHtml( 'destfilename' );
 589                 $summary = wfMsgWikiHtml( 'fileuploadsummary' );
 590
 591                 $licenses = new Licenses();
 592                 $license = wfMsgHtml( 'license' );
 593                 $nolicense = wfMsgHtml( 'nolicense' );
 594                 $licenseshtml = $licenses->getHtml();
 595
 596                 $ulb = wfMsgHtml( 'uploadbtn' );
 597
 598
 599                 $titleObj = Title::makeTitle( NS_SPECIAL, 'Upload' );
 600                 $action = $titleObj->escapeLocalURL();
 601
 602                 $encDestFile = htmlspecialchars( $this->mDestFile );
 603
 604                 $watchChecked = $wgUser->getOption( 'watchdefault' )
 605                         ? 'checked="checked"'
 606                         : '';
 607
 608                 $wgOut->addHTML( "
 609         <form id='upload' method='post' enctype='multipart/form-data' action=\"$action\">
 610                 <table border='0'>
 611                 <tr>
 612                         <td align='right'><label for='wpUploadFile'>{$sourcefilename}:</label></td>
 613                         <td align='left'>
 614                                 <input tabindex='1' type='file' name='wpUploadFile' id='wpUploadFile' " . ($this->mDestFile?"":"onchange='fillDestFilename()' ") . "size='40' />
 615                         </td>
 616                 </tr>
 617                 <tr>
 618                         <td align='right'><label for='wpDestFile'>{$destfilename}:</label></td>
 619                         <td align='left'>
 620                                 <input tabindex='2' type='text' name='wpDestFile' id='wpDestFile' size='40' value=\"$encDestFile\" />
 621                         </td>
 622                 </tr>
 623                 <tr>
 624                         <td align='right'><label for='wpUploadDescription'>{$summary}</label></td>
 625                         <td align='left'>
 626                                 <textarea tabindex='3' name='wpUploadDescription' id='wpUploadDescription' rows='6' cols='{$cols}'{$ew}>" . htmlspecialchars( $this->mUploadDescription ) . "</textarea>
 627                         </td>
 628                 </tr>
 629                 <tr>" );
 630
 631                 if ( $licenseshtml != '' ) {
 632                         global $wgStylePath;
 633                         $wgOut->addHTML( "
 634                         <td align='right'><label for='wpLicense'>$license:</label></td>
 635                         <td align='left'>
 636                                 <script type='text/javascript' src=\"$wgStylePath/common/upload.js\"></script>
 637                                 <select name='wpLicense' id='wpLicense' tabindex='4'
 638                                         onchange='licenseSelectorCheck()'>
 639                                         <option value=''>$nolicense</option>
 640                                         $licenseshtml
 641                                 </select>
 642                         </td>
 643                         </tr>
 644                         <tr>
 645                 ");
 646                 }
 647
 648                 if ( $wgUseCopyrightUpload ) {
 649                         $filestatus = wfMsgHtml ( 'filestatus' );
 650                         $copystatus =  htmlspecialchars( $this->mUploadCopyStatus );
 651                         $filesource = wfMsgHtml ( 'filesource' );
 652                         $uploadsource = htmlspecialchars( $this->mUploadSource );
 653
 654                         $wgOut->addHTML( "
 655                                 <td align='right' nowrap='nowrap'><label for='wpUploadCopyStatus'>$filestatus:</label></td>
 656                                 <td><input tabindex='5' type='text' name='wpUploadCopyStatus' id='wpUploadCopyStatus' value=\"$copystatus\" size='40' /></td>
 657                         </tr>
 658                         <tr>
 659                                 <td align='right'><label for='wpUploadCopyStatus'>$filesource:</label></td>
 660                                 <td><input tabindex='6' type='text' name='wpUploadSource' id='wpUploadCopyStatus' value=\"$uploadsource\" size='40' /></td>
 661                         </tr>
 662                         <tr>
 663                 ");
 664                 }
 665
 666
 667                 $wgOut->addHtml( "
 668                 <td></td>
 669                 <td>
 670                         <input tabindex='7' type='checkbox' name='wpWatchthis' id='wpWatchthis' $watchChecked value='true' />
 671                         <label for='wpWatchthis'>" . wfMsgHtml( 'watchthis' ) . "</label>
 672                         <input tabindex='8' type='checkbox' name='wpIgnoreWarning' id='wpIgnoreWarning' value='true' />
 673                         <label for='wpIgnoreWarning'>" . wfMsgHtml( 'ignorewarnings' ) . "</label>
 674                 </td>
 675         </tr>
 676         <tr>
 677
 678         </tr>
 679         <tr>
 680                 <td></td>
 681                 <td align='left'><input tabindex='9' type='submit' name='wpUpload' value=\"{$ulb}\" /></td>
 682         </tr>
 683
 684         <tr>
 685                 <td></td>
 686                 <td align='left'>
 687                 " );
 688                 $wgOut->addWikiText( wfMsgForContent( 'edittools' ) );
 689                 $wgOut->addHTML( "
 690                 </td>
 691         </tr>
 692
 693         </table>
 694         </form>" );
 695         }
 696
 697         /* -------------------------------------------------------------- */
 698
 699         /**
 700          * Split a file into a base name and all dot-delimited 'extensions'
 701          * on the end. Some web server configurations will fall back to
 702          * earlier pseudo-'extensions' to determine type and execute
 703          * scripts, so the blacklist needs to check them all.
 704          *
 705          * @return array
 706          */
 707         function splitExtensions( $filename ) {
 708                 $bits = explode( '.', $filename );
 709                 $basename = array_shift( $bits );
 710                 return array( $basename, $bits );
 711         }
 712
 713         /**
 714          * Perform case-insensitive match against a list of file extensions.
 715          * Returns true if the extension is in the list.
 716          *
 717          * @param string $ext
 718          * @param array $list
 719          * @return bool
 720          */
 721         function checkFileExtension( $ext, $list ) {
 722                 return in_array( strtolower( $ext ), $list );
 723         }
 724
 725         /**
 726          * Perform case-insensitive match against a list of file extensions.
 727          * Returns true if any of the extensions are in the list.
 728          *
 729          * @param array $ext
 730          * @param array $list
 731          * @return bool
 732          */
 733         function checkFileExtensionList( $ext, $list ) {
 734                 foreach( $ext as $e ) {
 735                         if( in_array( strtolower( $e ), $list ) ) {
 736                                 return true;
 737                         }
 738                 }
 739                 return false;
 740         }
 741
 742         /**
 743          * Verifies that it's ok to include the uploaded file
 744          *
 745          * @param string $tmpfile the full path of the temporary file to verify
 746          * @param string $extension The filename extension that the file is to be served with
 747          * @return mixed true of the file is verified, a WikiError object otherwise.
 748          */
 749         function verify( $tmpfile, $extension ) {
 750                 #magically determine mime type
 751                 $magic=& wfGetMimeMagic();
 752                 $mime= $magic->guessMimeType($tmpfile,false);
 753
 754                 $fname= "SpecialUpload::verify";
 755
 756                 #check mime type, if desired
 757                 global $wgVerifyMimeType;
 758                 if ($wgVerifyMimeType) {
 759
 760                         #check mime type against file extension
 761                         if( !$this->verifyExtension( $mime, $extension ) ) {
 762                                 return new WikiErrorMsg( 'uploadcorrupt' );
 763                         }
 764
 765                         #check mime type blacklist
 766                         global $wgMimeTypeBlacklist;
 767                         if( isset($wgMimeTypeBlacklist) && !is_null($wgMimeTypeBlacklist)
 768                                 && $this->checkFileExtension( $mime, $wgMimeTypeBlacklist ) ) {
 769                                 return new WikiErrorMsg( 'badfiletype', htmlspecialchars( $mime ) );
 770                         }
 771                 }
 772
 773                 #check for htmlish code and javascript
 774                 if( $this->detectScript ( $tmpfile, $mime ) ) {
 775                         return new WikiErrorMsg( 'uploadscripted' );
 776                 }
 777
 778                 /**
 779                 * Scan the uploaded file for viruses
 780                 */
 781                 $virus= $this->detectVirus($tmpfile);
 782                 if ( $virus ) {
 783                         return new WikiErrorMsg( 'uploadvirus', htmlspecialchars($virus) );
 784                 }
 785
 786                 wfDebug( "$fname: all clear; passing.\n" );
 787                 return true;
 788         }
 789
 790         /**
 791          * Checks if the mime type of the uploaded file matches the file extension.
 792          *
 793          * @param string $mime the mime type of the uploaded file
 794          * @param string $extension The filename extension that the file is to be served with
 795          * @return bool
 796          */
 797         function verifyExtension( $mime, $extension ) {
 798                 $fname = 'SpecialUpload::verifyExtension';
 799
 800                 $magic =& wfGetMimeMagic();
 801
 802                 if ( ! $mime || $mime == 'unknown' || $mime == 'unknown/unknown' )
 803                         if ( ! $magic->isRecognizableExtension( $extension ) ) {
 804                                 wfDebug( "$fname: passing file with unknown detected mime type; unrecognized extension '$extension', can't verify\n" );
 805                                 return true;
 806                         } else {
 807                                 wfDebug( "$fname: rejecting file with unknown detected mime type; recognized extension '$extension', so probably invalid file\n" );
 808                                 return false;
 809                         }
 810
 811                 $match= $magic->isMatchingExtension($extension,$mime);
 812
 813                 if ($match===NULL) {
 814                         wfDebug( "$fname: no file extension known for mime type $mime, passing file\n" );
 815                         return true;
 816                 } elseif ($match===true) {
 817                         wfDebug( "$fname: mime type $mime matches extension $extension, passing file\n" );
 818
 819                         #TODO: if it's a bitmap, make sure PHP or ImageMagic resp. can handle it!
 820                         return true;
 821
 822                 } else {
 823                         wfDebug( "$fname: mime type $mime mismatches file extension $extension, rejecting file\n" );
 824                         return false;
 825                 }
 826         }
 827
 828         /** Heuristig for detecting files that *could* contain JavaScript instructions or
 829         * things that may look like HTML to a browser and are thus
 830         * potentially harmful. The present implementation will produce false positives in some situations.
 831         *
 832         * @param string $file Pathname to the temporary upload file
 833         * @param string $mime The mime type of the file
 834         * @return bool true if the file contains something looking like embedded scripts
 835         */
 836         function detectScript($file,$mime) {
 837
 838                 #ugly hack: for text files, always look at the entire file.
 839                 #For binarie field, just check the first K.
 840
 841                 if (strpos($mime,'text/')===0) $chunk = file_get_contents( $file );
 842                 else {
 843                         $fp = fopen( $file, 'rb' );
 844                         $chunk = fread( $fp, 1024 );
 845                         fclose( $fp );
 846                 }
 847
 848                 $chunk= strtolower( $chunk );
 849
 850                 if (!$chunk) return false;
 851
 852                 #decode from UTF-16 if needed (could be used for obfuscation).
 853                 if (substr($chunk,0,2)=="\xfe\xff") $enc= "UTF-16BE";
 854                 elseif (substr($chunk,0,2)=="\xff\xfe") $enc= "UTF-16LE";
 855                 else $enc= NULL;
 856
 857                 if ($enc) $chunk= iconv($enc,"ASCII//IGNORE",$chunk);
 858
 859                 $chunk= trim($chunk);
 860
 861                 #FIXME: convert from UTF-16 if necessarry!
 862
 863                 wfDebug("SpecialUpload::detectScript: checking for embedded scripts and HTML stuff\n");
 864
 865                 #check for HTML doctype
 866                 if (eregi("<!DOCTYPE *X?HTML",$chunk)) return true;
 867
 868                 /**
 869                 * Internet Explorer for Windows performs some really stupid file type
 870                 * autodetection which can cause it to interpret valid image files as HTML
 871                 * and potentially execute JavaScript, creating a cross-site scripting
 872                 * attack vectors.
 873                 *
 874                 * Apple's Safari browser also performs some unsafe file type autodetection
 875                 * which can cause legitimate files to be interpreted as HTML if the
 876                 * web server is not correctly configured to send the right content-type
 877                 * (or if you're really uploading plain text and octet streams!)
 878                 *
 879                 * Returns true if IE is likely to mistake the given file for HTML.
 880                 * Also returns true if Safari would mistake the given file for HTML
 881                 * when served with a generic content-type.
 882                 */
 883
 884                 $tags = array(
 885                         '<body',
 886                         '<head',
 887                         '<html',   #also in safari
 888                         '<img',
 889                         '<pre',
 890                         '<script', #also in safari
 891                         '<table',
 892                         '<title'   #also in safari
 893                         );
 894
 895                 foreach( $tags as $tag ) {
 896                         if( false !== strpos( $chunk, $tag ) ) {
 897                                 return true;
 898                         }
 899                 }
 900
 901                 /*
 902                 * look for javascript
 903                 */
 904
 905                 #resolve entity-refs to look at attributes. may be harsh on big files... cache result?
 906                 $chunk = Sanitizer::decodeCharReferences( $chunk );
 907
 908                 #look for script-types
 909                 if (preg_match("!type\s*=\s*['\"]?\s*(\w*/)?(ecma|java)!sim",$chunk)) return true;
 910
 911                 #look for html-style script-urls
 912                 if (preg_match("!(href|src|data)\s*=\s*['\"]?\s*(ecma|java)script:!sim",$chunk)) return true;
 913
 914                 #look for css-style script-urls
 915                 if (preg_match("!url\s*\(\s*['\"]?\s*(ecma|java)script:!sim",$chunk)) return true;
 916
 917                 wfDebug("SpecialUpload::detectScript: no scripts found\n");
 918                 return false;
 919         }
 920
 921         /** Generic wrapper function for a virus scanner program.
 922         * This relies on the $wgAntivirus and $wgAntivirusSetup variables.
 923         * $wgAntivirusRequired may be used to deny upload if the scan fails.
 924         *
 925         * @param string $file Pathname to the temporary upload file
 926         * @return mixed false if not virus is found, NULL if the scan fails or is disabled,
 927         *         or a string containing feedback from the virus scanner if a virus was found.
 928         *         If textual feedback is missing but a virus was found, this function returns true.
 929         */
 930         function detectVirus($file) {
 931                 global $wgAntivirus, $wgAntivirusSetup, $wgAntivirusRequired, $wgOut;
 932
 933                 $fname= "SpecialUpload::detectVirus";
 934
 935                 if (!$wgAntivirus) { #disabled?
 936                         wfDebug("$fname: virus scanner disabled\n");
 937
 938                         return NULL;
 939                 }
 940
 941                 if (!$wgAntivirusSetup[$wgAntivirus]) {
 942                         wfDebug("$fname: unknown virus scanner: $wgAntivirus\n");
 943
 944                         $wgOut->addHTML( "<div class='error'>Bad configuration: unknown virus scanner: <i>$wgAntivirus</i></div>\n" ); #LOCALIZE
 945
 946                         return "unknown antivirus: $wgAntivirus";
 947                 }
 948
 949                 #look up scanner configuration
 950                 $virus_scanner= $wgAntivirusSetup[$wgAntivirus]["command"]; #command pattern
 951                 $virus_scanner_codes= $wgAntivirusSetup[$wgAntivirus]["codemap"]; #exit-code map
 952                 $msg_pattern= $wgAntivirusSetup[$wgAntivirus]["messagepattern"]; #message pattern
 953
 954                 $scanner= $virus_scanner; #copy, so we can resolve the pattern
 955
 956                 if (strpos($scanner,"%f")===false) $scanner.= " ".wfEscapeShellArg($file); #simple pattern: append file to scan
 957                 else $scanner= str_replace("%f",wfEscapeShellArg($file),$scanner); #complex pattern: replace "%f" with file to scan
 958
 959                 wfDebug("$fname: running virus scan: $scanner \n");
 960
 961                 #execute virus scanner
 962                 $code= false;
 963
 964                 #NOTE: there's a 50 line workaround to make stderr redirection work on windows, too.
 965                 #      that does not seem to be worth the pain.
 966                 #      Ask me (Duesentrieb) about it if it's ever needed.
 967                 if (wfIsWindows()) exec("$scanner",$output,$code);
 968                 else exec("$scanner 2>&1",$output,$code);
 969
 970                 $exit_code= $code; #remeber for user feedback
 971
 972                 if ($virus_scanner_codes) { #map exit code to AV_xxx constants.
 973                         if (isset($virus_scanner_codes[$code])) $code= $virus_scanner_codes[$code]; #explicite mapping
 974                         else if (isset($virus_scanner_codes["*"])) $code= $virus_scanner_codes["*"]; #fallback mapping
 975                 }
 976
 977                 if ($code===AV_SCAN_FAILED) { #scan failed (code was mapped to false by $virus_scanner_codes)
 978                         wfDebug("$fname: failed to scan $file (code $exit_code).\n");
 979
 980                         if ($wgAntivirusRequired) return "scan failed (code $exit_code)";
 981                         else return NULL;
 982                 }
 983                 else if ($code===AV_SCAN_ABORTED) { #scan failed because filetype is unknown (probably imune)
 984                         wfDebug("$fname: unsupported file type $file (code $exit_code).\n");
 985                         return NULL;
 986                 }
 987                 else if ($code===AV_NO_VIRUS) {
 988                         wfDebug("$fname: file passed virus scan.\n");
 989                         return false; #no virus found
 990                 }
 991                 else {
 992                         $output= join("\n",$output);
 993                         $output= trim($output);
 994
 995                         if (!$output) $output= true; #if ther's no output, return true
 996                         else if ($msg_pattern) {
 997                                 $groups= array();
 998                                 if (preg_match($msg_pattern,$output,$groups)) {
 999                                         if ($groups[1]) $output= $groups[1];
1000                                 }
1001                         }
1002
1003                         wfDebug("$fname: FOUND VIRUS! scanner feedback: $output");
1004                         return $output;
1005                 }
1006         }
1007
1008         /**
1009          * Check if the temporary file is MacBinary-encoded, as some uploads
1010          * from Internet Explorer on Mac OS Classic and Mac OS X will be.
1011          * If so, the data fork will be extracted to a second temporary file,
1012          * which will then be checked for validity and either kept or discarded.
1013          *
1014          * @access private
1015          */
1016         function checkMacBinary() {
1017                 $macbin = new MacBinary( $this->mUploadTempName );
1018                 if( $macbin->isValid() ) {
1019                         $dataFile = tempnam( wfTempDir(), "WikiMacBinary" );
1020                         $dataHandle = fopen( $dataFile, 'wb' );
1021
1022                         wfDebug( "SpecialUpload::checkMacBinary: Extracting MacBinary data fork to $dataFile\n" );
1023                         $macbin->extractData( $dataHandle );
1024
1025                         $this->mUploadTempName = $dataFile;
1026                         $this->mUploadSize = $macbin->dataForkLength();
1027
1028                         // We'll have to manually remove the new file if it's not kept.
1029                         $this->mRemoveTempFile = true;
1030                 }
1031                 $macbin->close();
1032         }
1033
1034         /**
1035          * If we've modified the upload file we need to manually remove it
1036          * on exit to clean up.
1037          * @access private
1038          */
1039         function cleanupTempFile() {
1040                 if( $this->mRemoveTempFile && file_exists( $this->mUploadTempName ) ) {
1041                         wfDebug( "SpecialUpload::cleanupTempFile: Removing temporary file $this->mUploadTempName\n" );
1042                         unlink( $this->mUploadTempName );
1043                 }
1044         }
1045
1046         /**
1047          * Check if there's an overwrite conflict and, if so, if restrictions
1048          * forbid this user from performing the upload.
1049          *
1050          * @return mixed true on success, WikiError on failure
1051          * @access private
1052          */
1053         function checkOverwrite( $name ) {
1054                 $img = Image::newFromName( $name );
1055                 if( is_null( $img ) ) {
1056                         // Uh... this shouldn't happen ;)
1057                         // But if it does, fall through to previous behavior
1058                         return false;
1059                 }
1060
1061                 $error = '';
1062                 if( $img->exists() ) {
1063                         global $wgUser, $wgOut;
1064                         if( $img->isLocal() ) {
1065                                 if( !$wgUser->isAllowed( 'reupload' ) ) {
1066                                         $error = 'fileexists-forbidden';
1067                                 }
1068                         } else {
1069                                 if( !$wgUser->isAllowed( 'reupload' ) ||
1070                                     !$wgUser->isAllowed( 'reupload-shared' ) ) {
1071                                         $error = "fileexists-shared-forbidden";
1072                                 }
1073                         }
1074                 }
1075
1076                 if( $error ) {
1077                         $errorText = wfMsg( $error, wfEscapeWikiText( $img->getName() ) );
1078                         return new WikiError( $wgOut->parse( $errorText ) );
1079                 }
1080
1081                 // Rockin', go ahead and upload
1082                 return true;
1083         }
1084
1085 }
1086 ?>