includes/SpecialUpload.php

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