includes/SpecialUpload.php

   1 <?php
   2 /**
   3  *
   4  * @addtogroup SpecialPage
   5  */
   6
   7
   8 /**
   9  * Entry point
  10  */
  11 function wfSpecialUpload() {
  12         global $wgRequest;
  13         $form = new UploadForm( $wgRequest );
  14         $form->execute();
  15 }
  16
  17 /**
  18  * implements Special:Upload
  19  * @addtogroup SpecialPage
  20  */
  21 class UploadForm {
  22         /**#@+
  23          * @access private
  24          */
  25         var $mComment, $mLicense, $mIgnoreWarning, $mCurlError;
  26         var $mDestName, $mTempPath, $mFileSize, $mFileProps;
  27         var $mCopyrightStatus, $mCopyrightSource, $mReUpload, $mAction, $mUploadClicked;
  28         var $mSrcName, $mSessionKey, $mStashed, $mDesiredDestName, $mRemoveTempFile, $mSourceType;
  29         var $mDestWarningAck, $mCurlDestHandle;
  30         var $mLocalFile;
  31
  32         # Placeholders for text injection by hooks (must be HTML)
  33         # extensions should take care to _append_ to the present value
  34         var $uploadFormTextTop;
  35         var $uploadFormTextAfterSummary;
  36
  37         const SESSION_VERSION = 1;
  38         /**#@-*/
  39
  40         /**
  41          * Constructor : initialise object
  42          * Get data POSTed through the form and assign them to the object
  43          * @param $request Data posted.
  44          */
  45         function UploadForm( &$request ) {
  46                 global $wgAllowCopyUploads;
  47                 $this->mDesiredDestName   = $request->getText( 'wpDestFile' );
  48                 $this->mIgnoreWarning     = $request->getCheck( 'wpIgnoreWarning' );
  49
  50                 if( !$request->wasPosted() ) {
  51                         # GET requests just give the main form; no data except wpDestfile.
  52                         return;
  53                 }
  54
  55                 # Placeholders for text injection by hooks (empty per default)
  56                 $this->uploadFormTextTop = "";
  57                 $this->uploadFormTextAfterSummary = "";
  58
  59                 $this->mReUpload          = $request->getCheck( 'wpReUpload' );
  60                 $this->mUploadClicked     = $request->getCheck( 'wpUpload' );
  61
  62                 $this->mComment           = $request->getText( 'wpUploadDescription' );
  63                 $this->mLicense           = $request->getText( 'wpLicense' );
  64                 $this->mCopyrightStatus   = $request->getText( 'wpUploadCopyStatus' );
  65                 $this->mCopyrightSource   = $request->getText( 'wpUploadSource' );
  66                 $this->mWatchthis         = $request->getBool( 'wpWatchthis' );
  67                 $this->mSourceType        = $request->getText( 'wpSourceType' );
  68                 $this->mDestWarningAck    = $request->getText( 'wpDestFileWarningAck' );
  69
  70                 $this->mAction            = $request->getVal( 'action' );
  71
  72                 $this->mSessionKey        = $request->getInt( 'wpSessionKey' );
  73                 if( !empty( $this->mSessionKey ) &&
  74                         isset( $_SESSION['wsUploadData'][$this->mSessionKey]['version'] ) &&
  75                         $_SESSION['wsUploadData'][$this->mSessionKey]['version'] == self::SESSION_VERSION ) {
  76                         /**
  77                          * Confirming a temporarily stashed upload.
  78                          * We don't want path names to be forged, so we keep
  79                          * them in the session on the server and just give
  80                          * an opaque key to the user agent.
  81                          */
  82                         $data = $_SESSION['wsUploadData'][$this->mSessionKey];
  83                         $this->mTempPath         = $data['mTempPath'];
  84                         $this->mFileSize         = $data['mFileSize'];
  85                         $this->mSrcName          = $data['mSrcName'];
  86                         $this->mFileProps        = $data['mFileProps'];
  87                         $this->mCurlError        = 0/*UPLOAD_ERR_OK*/;
  88                         $this->mStashed          = true;
  89                         $this->mRemoveTempFile   = false;
  90                 } else {
  91                         /**
  92                          *Check for a newly uploaded file.
  93                          */
  94                         if( $wgAllowCopyUploads && $this->mSourceType == 'web' ) {
  95                                 $this->initializeFromUrl( $request );
  96                         } else {
  97                                 $this->initializeFromUpload( $request );
  98                         }
  99                 }
 100         }
 101
 102         /**
 103          * Initialize the uploaded file from PHP data
 104          * @access private
 105          */
 106         function initializeFromUpload( $request ) {
 107                 $this->mTempPath       = $request->getFileTempName( 'wpUploadFile' );
 108                 $this->mFileSize       = $request->getFileSize( 'wpUploadFile' );
 109                 $this->mSrcName        = $request->getFileName( 'wpUploadFile' );
 110                 $this->mCurlError      = $request->getUploadError( 'wpUploadFile' );
 111                 $this->mSessionKey     = false;
 112                 $this->mStashed        = false;
 113                 $this->mRemoveTempFile = false; // PHP will handle this
 114         }
 115
 116         /**
 117          * Copy a web file to a temporary file
 118          * @access private
 119          */
 120         function initializeFromUrl( $request ) {
 121                 global $wgTmpDirectory;
 122                 $url = $request->getText( 'wpUploadFileURL' );
 123                 $local_file = tempnam( $wgTmpDirectory, 'WEBUPLOAD' );
 124
 125                 $this->mTempPath       = $local_file;
 126                 $this->mFileSize       = 0; # Will be set by curlCopy
 127                 $this->mCurlError      = $this->curlCopy( $url, $local_file );
 128                 $this->mSrcName        = array_pop( explode( '/', $url ) );
 129                 $this->mSessionKey     = false;
 130                 $this->mStashed        = false;
 131
 132                 // PHP won't auto-cleanup the file
 133                 $this->mRemoveTempFile = file_exists( $local_file );
 134         }
 135
 136         /**
 137          * Safe copy from URL
 138          * Returns true if there was an error, false otherwise
 139          */
 140         private function curlCopy( $url, $dest ) {
 141                 global $wgUser, $wgOut;
 142
 143                 if( !$wgUser->isAllowed( 'upload_by_url' ) ) {
 144                         $wgOut->permissionRequired( 'upload_by_url' );
 145                         return true;
 146                 }
 147
 148                 # Maybe remove some pasting blanks :-)
 149                 $url =  trim( $url );
 150                 if( stripos($url, 'http://') !== 0 && stripos($url, 'ftp://') !== 0 ) {
 151                         # Only HTTP or FTP URLs
 152                         $wgOut->errorPage( 'upload-proto-error', 'upload-proto-error-text' );
 153                         return true;
 154                 }
 155
 156                 # Open temporary file
 157                 $this->mCurlDestHandle = @fopen( $this->mTempPath, "wb" );
 158                 if( $this->mCurlDestHandle === false ) {
 159                         # Could not open temporary file to write in
 160                         $wgOut->errorPage( 'upload-file-error', 'upload-file-error-text');
 161                         return true;
 162                 }
 163
 164                 $ch = curl_init();
 165                 curl_setopt( $ch, CURLOPT_HTTP_VERSION, 1.0); # Probably not needed, but apparently can work around some bug
 166                 curl_setopt( $ch, CURLOPT_TIMEOUT, 10); # 10 seconds timeout
 167                 curl_setopt( $ch, CURLOPT_LOW_SPEED_LIMIT, 512); # 0.5KB per second minimum transfer speed
 168                 curl_setopt( $ch, CURLOPT_URL, $url);
 169                 curl_setopt( $ch, CURLOPT_WRITEFUNCTION, array( $this, 'uploadCurlCallback' ) );
 170                 curl_exec( $ch );
 171                 $error = curl_errno( $ch ) ? true : false;
 172                 $errornum =  curl_errno( $ch );
 173                 // if ( $error ) print curl_error ( $ch ) ; # Debugging output
 174                 curl_close( $ch );
 175
 176                 fclose( $this->mCurlDestHandle );
 177                 unset( $this->mCurlDestHandle );
 178                 if( $error ) {
 179                         unlink( $dest );
 180                         if( wfEmptyMsg( "upload-curl-error$errornum", wfMsg("upload-curl-error$errornum") ) )
 181                                 $wgOut->errorPage( 'upload-misc-error', 'upload-misc-error-text' );
 182                         else
 183                                 $wgOut->errorPage( "upload-curl-error$errornum", "upload-curl-error$errornum-text" );
 184                 }
 185
 186                 return $error;
 187         }
 188
 189         /**
 190          * Callback function for CURL-based web transfer
 191          * Write data to file unless we've passed the length limit;
 192          * if so, abort immediately.
 193          * @access private
 194          */
 195         function uploadCurlCallback( $ch, $data ) {
 196                 global $wgMaxUploadSize;
 197                 $length = strlen( $data );
 198                 $this->mFileSize += $length;
 199                 if( $this->mFileSize > $wgMaxUploadSize ) {
 200                         return 0;
 201                 }
 202                 fwrite( $this->mCurlDestHandle, $data );
 203                 return $length;
 204         }
 205
 206         /**
 207          * Start doing stuff
 208          * @access public
 209          */
 210         function execute() {
 211                 global $wgUser, $wgOut;
 212                 global $wgEnableUploads;
 213
 214                 # Check uploading enabled
 215                 if( !$wgEnableUploads ) {
 216                         $wgOut->showErrorPage( 'uploaddisabled', 'uploaddisabledtext', array( $this->mDesiredDestName ) );
 217                         return;
 218                 }
 219
 220                 # Check permissions
 221                 if( !$wgUser->isAllowed( 'upload' ) ) {
 222                         if( !$wgUser->isLoggedIn() ) {
 223                                 $wgOut->showErrorPage( 'uploadnologin', 'uploadnologintext' );
 224                         } else {
 225                                 $wgOut->permissionRequired( 'upload' );
 226                         }
 227                         return;
 228                 }
 229
 230                 # Check blocks
 231                 if( $wgUser->isBlocked() ) {
 232                         $wgOut->blockedPage();
 233                         return;
 234                 }
 235
 236                 if( wfReadOnly() ) {
 237                         $wgOut->readOnlyPage();
 238                         return;
 239                 }
 240
 241                 if( $this->mReUpload ) {
 242                         if( !$this->unsaveUploadedFile() ) {
 243                                 return;
 244                         }
 245                         $this->mainUploadForm();
 246                 } else if( 'submit' == $this->mAction || $this->mUploadClicked ) {
 247                         $this->processUpload();
 248                 } else {
 249                         $this->mainUploadForm();
 250                 }
 251
 252                 $this->cleanupTempFile();
 253         }
 254
 255         /* -------------------------------------------------------------- */
 256
 257         /**
 258          * Really do the upload
 259          * Checks are made in SpecialUpload::execute()
 260          * @access private
 261          */
 262         function processUpload() {
 263                 global $wgUser, $wgOut;
 264
 265                 if( !wfRunHooks( 'UploadForm:BeforeProcessing', array( &$this ) ) )
 266                 {
 267                         wfDebug( "Hook 'UploadForm:BeforeProcessing' broke processing the file." );
 268                         return false;
 269                 }
 270
 271                 /* Check for PHP error if any, requires php 4.2 or newer */
 272                 if( $this->mCurlError == 1/*UPLOAD_ERR_INI_SIZE*/ ) {
 273                         $this->mainUploadForm( wfMsgHtml( 'largefileserver' ) );
 274                         return;
 275                 }
 276
 277                 /**
 278                  * If there was no filename or a zero size given, give up quick.
 279                  */
 280                 if( trim( $this->mSrcName ) == '' || empty( $this->mFileSize ) ) {
 281                         $this->mainUploadForm( wfMsgHtml( 'emptyfile' ) );
 282                         return;
 283                 }
 284
 285                 # Chop off any directories in the given filename
 286                 if( $this->mDesiredDestName ) {
 287                         $basename = $this->mDesiredDestName;
 288                 } else {
 289                         $basename = $this->mSrcName;
 290                 }
 291                 $filtered = wfBaseName( $basename );
 292
 293                 /**
 294                  * We'll want to blacklist against *any* 'extension', and use
 295                  * only the final one for the whitelist.
 296                  */
 297                 list( $partname, $ext ) = $this->splitExtensions( $filtered );
 298
 299                 if( count( $ext ) ) {
 300                         $finalExt = $ext[count( $ext ) - 1];
 301                 } else {
 302                         $finalExt = '';
 303                 }
 304
 305                 # If there was more than one "extension", reassemble the base
 306                 # filename to prevent bogus complaints about length
 307                 if( count( $ext ) > 1 ) {
 308                         for( $i = 0; $i < count( $ext ) - 1; $i++ )
 309                                 $partname .= '.' . $ext[$i];
 310                 }
 311
 312                 if( strlen( $partname ) < 1 ) {
 313                         $this->mainUploadForm( wfMsgHtml( 'minlength1' ) );
 314                         return;
 315                 }
 316
 317                 /**
 318                  * Filter out illegal characters, and try to make a legible name
 319                  * out of it. We'll strip some silently that Title would die on.
 320                  */
 321                 $filtered = preg_replace ( "/[^".Title::legalChars()."]|:/", '-', $filtered );
 322                 $nt = Title::makeTitleSafe( NS_IMAGE, $filtered );
 323                 if( is_null( $nt ) ) {
 324                         $this->uploadError( wfMsgWikiHtml( 'illegalfilename', htmlspecialchars( $filtered ) ) );
 325                         return;
 326                 }
 327                 $this->mLocalFile = wfLocalFile( $nt );
 328                 $this->mDestName = $this->mLocalFile->getName();
 329
 330                 /**
 331                  * If the image is protected, non-sysop users won't be able
 332                  * to modify it by uploading a new revision.
 333                  */
 334                 if( !$nt->userCan( 'edit' ) ) {
 335                         return $this->uploadError( wfMsgWikiHtml( 'protectedpage' ) );
 336                 }
 337
 338                 /**
 339                  * In some cases we may forbid overwriting of existing files.
 340                  */
 341                 $overwrite = $this->checkOverwrite( $this->mDestName );
 342                 if( WikiError::isError( $overwrite ) ) {
 343                         return $this->uploadError( $overwrite->toString() );
 344                 }
 345
 346                 /* Don't allow users to override the blacklist (check file extension) */
 347                 global $wgStrictFileExtensions;
 348                 global $wgFileExtensions, $wgFileBlacklist;
 349                 if ($finalExt == '') {
 350                         return $this->uploadError( wfMsgExt( 'filetype-missing', array ( 'parseinline' ) ) );
 351                 } elseif ( $this->checkFileExtensionList( $ext, $wgFileBlacklist ) ||
 352                                 ($wgStrictFileExtensions && !$this->checkFileExtension( $finalExt, $wgFileExtensions ) ) ) {
 353                         return $this->uploadError( wfMsgExt( 'filetype-badtype', array ( 'parseinline' ),
 354                                 htmlspecialchars( $finalExt ), implode ( ', ', $wgFileExtensions ) ) );
 355                 }
 356
 357                 /**
 358                  * Look at the contents of the file; if we can recognize the
 359                  * type but it's corrupt or data of the wrong type, we should
 360                  * probably not accept it.
 361                  */
 362                 if( !$this->mStashed ) {
 363                         $this->mFileProps = File::getPropsFromPath( $this->mTempPath, $finalExt );
 364                         $this->checkMacBinary();
 365                         $veri = $this->verify( $this->mTempPath, $finalExt );
 366
 367                         if( $veri !== true ) { //it's a wiki error...
 368                                 return $this->uploadError( $veri->toString() );
 369                         }
 370
 371                         /**
 372                          * Provide an opportunity for extensions to add further checks
 373                          */
 374                         $error = '';
 375                         if( !wfRunHooks( 'UploadVerification',
 376                                         array( $this->mDestName, $this->mTempPath, &$error ) ) ) {
 377                                 return $this->uploadError( $error );
 378                         }
 379                 }
 380
 381
 382                 /**
 383                  * Check for non-fatal conditions
 384                  */
 385                 if ( ! $this->mIgnoreWarning ) {
 386                         $warning = '';
 387
 388                         global $wgCapitalLinks;
 389                         if( $wgCapitalLinks ) {
 390                                 $filtered = ucfirst( $filtered );
 391                         }
 392                         if( $basename != $filtered ) {
 393                                 $warning .=  '<li>'.wfMsgHtml( 'badfilename', htmlspecialchars( $this->mDestName ) ).'</li>';
 394                         }
 395
 396                         global $wgCheckFileExtensions;
 397                         if ( $wgCheckFileExtensions ) {
 398                                 if ( ! $this->checkFileExtension( $finalExt, $wgFileExtensions ) ) {
 399                                         $warning .= '<li>'.wfMsgExt( 'filetype-badtype', array ( 'parseinline' ),
 400                                                 htmlspecialchars( $finalExt ), implode ( ', ', $wgFileExtensions ) ).'</li>';
 401                                 }
 402                         }
 403
 404                         global $wgUploadSizeWarning;
 405                         if ( $wgUploadSizeWarning && ( $this->mFileSize > $wgUploadSizeWarning ) ) {
 406                                 $skin = $wgUser->getSkin();
 407                                 $wsize = $skin->formatSize( $wgUploadSizeWarning );
 408                                 $asize = $skin->formatSize( $this->mFileSize );
 409                                 $warning .= '<li>' . wfMsgHtml( 'large-file', $wsize, $asize ) . '</li>';
 410                         }
 411                         if ( $this->mFileSize == 0 ) {
 412                                 $warning .= '<li>'.wfMsgHtml( 'emptyfile' ).'</li>';
 413                         }
 414
 415                         if ( !$this->mDestWarningAck ) {
 416                                 $warning .= self::getExistsWarning( $this->mLocalFile );
 417                         }
 418                         if( $warning != '' ) {
 419                                 /**
 420                                  * Stash the file in a temporary location; the user can choose
 421                                  * to let it through and we'll complete the upload then.
 422                                  */
 423                                 return $this->uploadWarning( $warning );
 424                         }
 425                 }
 426
 427                 /**
 428                  * Try actually saving the thing...
 429                  * It will show an error form on failure.
 430                  */
 431                 $pageText = self::getInitialPageText( $this->mComment, $this->mLicense,
 432                         $this->mCopyrightStatus, $this->mCopyrightSource );
 433
 434                 $status = $this->mLocalFile->upload( $this->mTempPath, $this->mComment, $pageText,
 435                         File::DELETE_SOURCE, $this->mFileProps );
 436                 if ( !$status->isGood() ) {
 437                         $this->showError( $status->getWikiText() );
 438                 } else {
 439                         if ( $this->mWatchthis ) {
 440                                 global $wgUser;
 441                                 $wgUser->addWatch( $this->mLocalFile->getTitle() );
 442                         }
 443                         // Success, redirect to description page
 444                         $wgOut->redirect( $this->mLocalFile->getTitle()->getFullURL() );
 445                         wfRunHooks( 'UploadComplete', array( &$img ) );
 446                 }
 447         }
 448
 449         /**
 450          * Do existence checks on a file and produce a warning
 451          * This check is static and can be done pre-upload via AJAX
 452          * Returns an HTML fragment consisting of one or more LI elements if there is a warning
 453          * Returns an empty string if there is no warning
 454          */
 455         static function getExistsWarning( $file ) {
 456                 global $wgUser;
 457                 // Check for uppercase extension. We allow these filenames but check if an image
 458                 // with lowercase extension exists already
 459                 $warning = '';
 460                 $ext = $file->getExtension();
 461                 $sk = $wgUser->getSkin();
 462                 if ( $ext !== '' ) {
 463                         $partname = substr( $file->getName(), 0, -strlen( $ext ) - 1 );
 464                 } else {
 465                         $partname = $file->getName();
 466                 }
 467
 468                 if ( $ext != strtolower( $ext ) ) {
 469                         $nt_lc = Title::newFromText( $partname . '.' . strtolower( $ext ) );
 470                         $file_lc = wfLocalFile( $nt_lc );
 471                 } else {
 472                         $file_lc = false;
 473                 }
 474
 475                 if( $file->exists() ) {
 476                         $dlink = $sk->makeKnownLinkObj( $file->getTitle() );
 477                         if ( $file->allowInlineDisplay() ) {
 478                                 $dlink2 = $sk->makeImageLinkObj( $file->getTitle(), wfMsgExt( 'fileexists-thumb', 'parseinline', $dlink ),
 479                                         $file->getName(), 'right', array(), false, true );
 480                         } elseif ( !$file->allowInlineDisplay() && $file->isSafeFile() ) {
 481                                 $icon = $file->iconThumb();
 482                                 $dlink2 = '<div style="float:right" id="mw-media-icon"><a href="' . $file->getURL() . '">' .
 483                                         $icon->toHtml() . '</a><br />' . $dlink . '</div>';
 484                         } else {
 485                                 $dlink2 = '';
 486                         }
 487
 488                         $warning .= '<li>' . wfMsgExt( 'fileexists', 'parseline', $dlink ) . '</li>' . $dlink2;
 489
 490                 } elseif ( $file_lc && $file_lc->exists() ) {
 491                         # Check if image with lowercase extension exists.
 492                         # It's not forbidden but in 99% it makes no sense to upload the same filename with uppercase extension
 493                         $dlink = $sk->makeKnownLinkObj( $nt_lc );
 494                         if ( $file_lc->allowInlineDisplay() ) {
 495                                 $dlink2 = $sk->makeImageLinkObj( $nt_lc, wfMsgExt( 'fileexists-thumb', 'parseinline', $dlink ),
 496                                         $nt_lc->getText(), 'right', array(), false, true );
 497                         } elseif ( !$file_lc->allowInlineDisplay() && $file_lc->isSafeFile() ) {
 498                                 $icon = $file_lc->iconThumb();
 499                                 $dlink2 = '<div style="float:right" id="mw-media-icon"><a href="' . $file_lc->getURL() . '">' .
 500                                         $icon->toHtml() . '</a><br />' . $dlink . '</div>';
 501                         } else {
 502                                 $dlink2 = '';
 503                         }
 504
 505                         $warning .= '<li>' . wfMsgExt( 'fileexists-extension', 'parsemag' , $partname . '.'
 506                                 . $ext , $dlink ) . '</li>' . $dlink2;
 507
 508                 } elseif ( ( substr( $partname , 3, 3 ) == 'px-' || substr( $partname , 2, 3 ) == 'px-' )
 509                         && ereg( "[0-9]{2}" , substr( $partname , 0, 2) ) )
 510                 {
 511                         # Check for filenames like 50px- or 180px-, these are mostly thumbnails
 512                         $nt_thb = Title::newFromText( substr( $partname , strpos( $partname , '-' ) +1 ) . '.' . $ext );
 513                         $file_thb = wfLocalFile( $nt_thb );
 514                         if ($file_thb->exists() ) {
 515                                 # Check if an image without leading '180px-' (or similiar) exists
 516                                 $dlink = $sk->makeKnownLinkObj( $nt_thb);
 517                                 if ( $file_thb->allowInlineDisplay() ) {
 518                                         $dlink2 = $sk->makeImageLinkObj( $nt_thb,
 519                                                 wfMsgExt( 'fileexists-thumb', 'parseinline', $dlink ),
 520                                                 $nt_thb->getText(), 'right', array(), false, true );
 521                                 } elseif ( !$file_thb->allowInlineDisplay() && $file_thb->isSafeFile() ) {
 522                                         $icon = $file_thb->iconThumb();
 523                                         $dlink2 = '<div style="float:right" id="mw-media-icon"><a href="' .
 524                                                 $file_thb->getURL() . '">' . $icon->toHtml() . '</a><br />' .
 525                                                 $dlink . '</div>';
 526                                 } else {
 527                                         $dlink2 = '';
 528                                 }
 529
 530                                 $warning .= '<li>' . wfMsgExt( 'fileexists-thumbnail-yes', 'parsemag', $dlink ) .
 531                                         '</li>' . $dlink2;
 532                         } else {
 533                                 # Image w/o '180px-' does not exists, but we do not like these filenames
 534                                 $warning .= '<li>' . wfMsgExt( 'file-thumbnail-no', 'parseinline' ,
 535                                         substr( $partname , 0, strpos( $partname , '-' ) +1 ) ) . '</li>';
 536                         }
 537                 }
 538                 if ( $file->wasDeleted() ) {
 539                         # If the file existed before and was deleted, warn the user of this
 540                         # Don't bother doing so if the image exists now, however
 541                         $ltitle = SpecialPage::getTitleFor( 'Log' );
 542                         $llink = $sk->makeKnownLinkObj( $ltitle, wfMsgHtml( 'deletionlog' ),
 543                                 'type=delete&page=' . $file->getTitle()->getPrefixedUrl() );
 544                         $warning .= '<li>' . wfMsgWikiHtml( 'filewasdeleted', $llink ) . '</li>';
 545                 }
 546                 return $warning;
 547         }
 548
 549         static function ajaxGetExistsWarning( $filename ) {
 550                 $file = wfFindFile( $filename );
 551                 $s = '&nbsp;';
 552                 if ( $file ) {
 553                         $warning = self::getExistsWarning( $file );
 554                         if ( $warning !== '' ) {
 555                                 $s = "<ul>$warning</ul>";
 556                         }
 557                 }
 558                 return $s;
 559         }
 560
 561         /**
 562          * Render a preview of a given license for the AJAX preview on upload
 563          *
 564          * @param string $license
 565          * @return string
 566          */
 567         public static function ajaxGetLicensePreview( $license ) {
 568                 global $wgParser, $wgUser;
 569                 $text = '{{' . $license . '}}';
 570                 $title = Title::makeTitle( NS_IMAGE, 'Sample.jpg' );
 571                 $options = ParserOptions::newFromUser( $wgUser );
 572
 573                 // Expand subst: first, then live templates...
 574                 $text = $wgParser->preSaveTransform( $text, $title, $wgUser, $options );
 575                 $output = $wgParser->parse( $text, $title, $options );
 576
 577                 return $output->getText();
 578         }
 579
 580         /**
 581          * Stash a file in a temporary directory for later processing
 582          * after the user has confirmed it.
 583          *
 584          * If the user doesn't explicitly cancel or accept, these files
 585          * can accumulate in the temp directory.
 586          *
 587          * @param string $saveName - the destination filename
 588          * @param string $tempName - the source temporary file to save
 589          * @return string - full path the stashed file, or false on failure
 590          * @access private
 591          */
 592         function saveTempUploadedFile( $saveName, $tempName ) {
 593                 global $wgOut;
 594                 $repo = RepoGroup::singleton()->getLocalRepo();
 595                 $status = $repo->storeTemp( $saveName, $tempName );
 596                 if ( !$status->isGood() ) {
 597                         $this->showError( $status->getWikiText() );
 598                         return false;
 599                 } else {
 600                         return $status->value;
 601                 }
 602         }
 603
 604         /**
 605          * Stash a file in a temporary directory for later processing,
 606          * and save the necessary descriptive info into the session.
 607          * Returns a key value which will be passed through a form
 608          * to pick up the path info on a later invocation.
 609          *
 610          * @return int
 611          * @access private
 612          */
 613         function stashSession() {
 614                 $stash = $this->saveTempUploadedFile( $this->mDestName, $this->mTempPath );
 615
 616                 if( !$stash ) {
 617                         # Couldn't save the file.
 618                         return false;
 619                 }
 620
 621                 $key = mt_rand( 0, 0x7fffffff );
 622                 $_SESSION['wsUploadData'][$key] = array(
 623                         'mTempPath'       => $stash,
 624                         'mFileSize'       => $this->mFileSize,
 625                         'mSrcName'        => $this->mSrcName,
 626                         'mFileProps'      => $this->mFileProps,
 627                         'version'         => self::SESSION_VERSION,
 628                 );
 629                 return $key;
 630         }
 631
 632         /**
 633          * Remove a temporarily kept file stashed by saveTempUploadedFile().
 634          * @access private
 635          * @return success
 636          */
 637         function unsaveUploadedFile() {
 638                 global $wgOut;
 639                 $repo = RepoGroup::singleton()->getLocalRepo();
 640                 $success = $repo->freeTemp( $this->mTempPath );
 641                 if ( ! $success ) {
 642                         $wgOut->showFileDeleteError( $this->mTempPath );
 643                         return false;
 644                 } else {
 645                         return true;
 646                 }
 647         }
 648
 649         /* -------------------------------------------------------------- */
 650
 651         /**
 652          * @param string $error as HTML
 653          * @access private
 654          */
 655         function uploadError( $error ) {
 656                 global $wgOut;
 657                 $wgOut->addHTML( "<h2>" . wfMsgHtml( 'uploadwarning' ) . "</h2>\n" );
 658                 $wgOut->addHTML( "<span class='error'>{$error}</span>\n" );
 659         }
 660
 661         /**
 662          * There's something wrong with this file, not enough to reject it
 663          * totally but we require manual intervention to save it for real.
 664          * Stash it away, then present a form asking to confirm or cancel.
 665          *
 666          * @param string $warning as HTML
 667          * @access private
 668          */
 669         function uploadWarning( $warning ) {
 670                 global $wgOut;
 671                 global $wgUseCopyrightUpload;
 672
 673                 $this->mSessionKey = $this->stashSession();
 674                 if( !$this->mSessionKey ) {
 675                         # Couldn't save file; an error has been displayed so let's go.
 676                         return;
 677                 }
 678
 679                 $wgOut->addHTML( "<h2>" . wfMsgHtml( 'uploadwarning' ) . "</h2>\n" );
 680                 $wgOut->addHTML( "<ul class='warning'>{$warning}</ul><br />\n" );
 681
 682                 $save = wfMsgHtml( 'savefile' );
 683                 $reupload = wfMsgHtml( 'reupload' );
 684                 $iw = wfMsgWikiHtml( 'ignorewarning' );
 685                 $reup = wfMsgWikiHtml( 'reuploaddesc' );
 686                 $titleObj = SpecialPage::getTitleFor( 'Upload' );
 687                 $action = $titleObj->escapeLocalURL( 'action=submit' );
 688
 689                 if ( $wgUseCopyrightUpload )
 690                 {
 691                         $copyright =  "
 692         <input type='hidden' name='wpUploadCopyStatus' value=\"" . htmlspecialchars( $this->mCopyrightStatus ) . "\" />
 693         <input type='hidden' name='wpUploadSource' value=\"" . htmlspecialchars( $this->mCopyrightSource ) . "\" />
 694         ";
 695                 } else {
 696                         $copyright = "";
 697                 }
 698
 699                 $wgOut->addHTML( "
 700         <form id='uploadwarning' method='post' enctype='multipart/form-data' action='$action'>
 701                 <input type='hidden' name='wpIgnoreWarning' value='1' />
 702                 <input type='hidden' name='wpSessionKey' value=\"" . htmlspecialchars( $this->mSessionKey ) . "\" />
 703                 <input type='hidden' name='wpUploadDescription' value=\"" . htmlspecialchars( $this->mComment ) . "\" />
 704                 <input type='hidden' name='wpLicense' value=\"" . htmlspecialchars( $this->mLicense ) . "\" />
 705                 <input type='hidden' name='wpDestFile' value=\"" . htmlspecialchars( $this->mDesiredDestName ) . "\" />
 706                 <input type='hidden' name='wpWatchthis' value=\"" . htmlspecialchars( intval( $this->mWatchthis ) ) . "\" />
 707         {$copyright}
 708         <table border='0'>
 709                 <tr>
 710                         <tr>
 711                                 <td align='right'>
 712                                         <input tabindex='2' type='submit' name='wpUpload' value=\"$save\" />
 713                                 </td>
 714                                 <td align='left'>$iw</td>
 715                         </tr>
 716                         <tr>
 717                                 <td align='right'>
 718                                         <input tabindex='2' type='submit' name='wpReUpload' value=\"{$reupload}\" />
 719                                 </td>
 720                                 <td align='left'>$reup</td>
 721                         </tr>
 722                 </tr>
 723         </table></form>\n" );
 724         }
 725
 726         /**
 727          * Displays the main upload form, optionally with a highlighted
 728          * error message up at the top.
 729          *
 730          * @param string $msg as HTML
 731          * @access private
 732          */
 733         function mainUploadForm( $msg='' ) {
 734                 global $wgOut, $wgUser;
 735                 global $wgUseCopyrightUpload, $wgUseAjax, $wgAjaxUploadDestCheck, $wgAjaxLicensePreview;
 736                 global $wgRequest, $wgAllowCopyUploads, $wgEnableAPI;
 737                 global $wgStylePath, $wgStyleVersion;
 738
 739                 $useAjaxDestCheck = $wgUseAjax && $wgAjaxUploadDestCheck;
 740                 $useAjaxLicensePreview = $wgUseAjax && $wgAjaxLicensePreview;
 741
 742                 $adc = wfBoolToStr( $useAjaxDestCheck );
 743                 $alp = wfBoolToStr( $useAjaxLicensePreview );
 744
 745                 $wgOut->addScript( "<script type=\"text/javascript\">
 746 wgAjaxUploadDestCheck = {$adc};
 747 wgAjaxLicensePreview = {$alp};
 748 </script>
 749 <script type=\"text/javascript\" src=\"{$wgStylePath}/common/upload.js?{$wgStyleVersion}\"></script>
 750                 " );
 751
 752                 if( !wfRunHooks( 'UploadForm:initial', array( &$this ) ) )
 753                 {
 754                         wfDebug( "Hook 'UploadForm:initial' broke output of the upload form" );
 755                         return false;
 756                 }
 757
 758                 $cols = intval($wgUser->getOption( 'cols' ));
 759                 $ew = $wgUser->getOption( 'editwidth' );
 760                 if ( $ew ) $ew = " style=\"width:100%\"";
 761                 else $ew = '';
 762
 763                 if ( '' != $msg ) {
 764                         $sub = wfMsgHtml( 'uploaderror' );
 765                         $wgOut->addHTML( "<h2>{$sub}</h2>\n" .
 766                           "<span class='error'>{$msg}</span>\n" );
 767                 }
 768                 $wgOut->addHTML( '<div id="uploadtext">' );
 769                 $wgOut->addWikiText( wfMsgNoTrans( 'uploadtext', $this->mDesiredDestName ) );
 770                 $wgOut->addHTML( '</div>' );
 771
 772                 $sourcefilename = wfMsgHtml( 'sourcefilename' );
 773                 $destfilename = wfMsgHtml( 'destfilename' );
 774                 $summary = wfMsgWikiHtml( 'fileuploadsummary' );
 775
 776                 $licenses = new Licenses();
 777                 $license = wfMsgExt( 'license', array( 'parseinline' ) );
 778                 $nolicense = wfMsgHtml( 'nolicense' );
 779                 $licenseshtml = $licenses->getHtml();
 780
 781                 $ulb = wfMsgHtml( 'uploadbtn' );
 782
 783
 784                 $titleObj = SpecialPage::getTitleFor( 'Upload' );
 785                 $action = $titleObj->escapeLocalURL();
 786
 787                 $encDestName = htmlspecialchars( $this->mDesiredDestName );
 788
 789                 $watchChecked =
 790                         ( $wgUser->getOption( 'watchdefault' ) ||
 791                                 ( $wgUser->getOption( 'watchcreations' ) && $this->mDesiredDestName == '' ) )
 792                         ? 'checked="checked"'
 793                         : '';
 794                 $warningChecked = $this->mIgnoreWarning ? 'checked' : '';
 795
 796                 // Prepare form for upload or upload/copy
 797                 if( $wgAllowCopyUploads && $wgUser->isAllowed( 'upload_by_url' ) ) {
 798                         $filename_form =
 799                                 "<input type='radio' id='wpSourceTypeFile' name='wpSourceType' value='file' " .
 800                                    "onchange='toggle_element_activation(\"wpUploadFileURL\",\"wpUploadFile\")' checked />" .
 801                                  "<input tabindex='1' type='file' name='wpUploadFile' id='wpUploadFile' " .
 802                                    "onfocus='" .
 803                                      "toggle_element_activation(\"wpUploadFileURL\",\"wpUploadFile\");" .
 804                                      "toggle_element_check(\"wpSourceTypeFile\",\"wpSourceTypeURL\")'" .
 805                                 ($this->mDesiredDestName?"":"onchange='fillDestFilename(\"wpUploadFile\")' ") . "size='40' />" .
 806                                 wfMsgHTML( 'upload_source_file' ) . "<br/>" .
 807                                 "<input type='radio' id='wpSourceTypeURL' name='wpSourceType' value='web' " .
 808                                   "onchange='toggle_element_activation(\"wpUploadFile\",\"wpUploadFileURL\")' />" .
 809                                 "<input tabindex='1' type='text' name='wpUploadFileURL' id='wpUploadFileURL' " .
 810                                   "onfocus='" .
 811                                     "toggle_element_activation(\"wpUploadFile\",\"wpUploadFileURL\");" .
 812                                     "toggle_element_check(\"wpSourceTypeURL\",\"wpSourceTypeFile\")'" .
 813                                 ($this->mDesiredDestName?"":"onchange='fillDestFilename(\"wpUploadFileURL\")' ") . "size='40' DISABLED />" .
 814                                 wfMsgHtml( 'upload_source_url' ) ;
 815                 } else {
 816                         $filename_form =
 817                                 "<input tabindex='1' type='file' name='wpUploadFile' id='wpUploadFile' " .
 818                                 ($this->mDesiredDestName?"":"onchange='fillDestFilename(\"wpUploadFile\")' ") .
 819                                 "size='40' />" .
 820                                 "<input type='hidden' name='wpSourceType' value='file' />" ;
 821                 }
 822                 if ( $useAjaxDestCheck ) {
 823                         $warningRow = "<tr><td colspan='2' id='wpDestFile-warning'>&nbsp</td></tr>";
 824                         $destOnkeyup = 'onkeyup="wgUploadWarningObj.keypress();"';
 825                 } else {
 826                         $warningRow = '';
 827                         $destOnkeyup = '';
 828                 }
 829
 830                 $encComment = htmlspecialchars( $this->mComment );
 831
 832                 $wgOut->addHTML( <<<EOT
 833         <form id='upload' method='post' enctype='multipart/form-data' action="$action">
 834                 <table border='0'>
 835                 <tr>
 836           {$this->uploadFormTextTop}
 837                         <td align='right' valign='top'><label for='wpUploadFile'>{$sourcefilename}:</label></td>
 838                         <td align='left'>
 839                                 {$filename_form}
 840                         </td>
 841                 </tr>
 842                 <tr>
 843                         <td align='right'><label for='wpDestFile'>{$destfilename}:</label></td>
 844                         <td align='left'>
 845                                 <input tabindex='2' type='text' name='wpDestFile' id='wpDestFile' size='40'
 846                                         value="$encDestName" $destOnkeyup />
 847                         </td>
 848                 </tr>
 849                 <tr>
 850                         <td align='right'><label for='wpUploadDescription'>{$summary}</label></td>
 851                         <td align='left'>
 852                                 <textarea tabindex='3' name='wpUploadDescription' id='wpUploadDescription' rows='6'
 853                                         cols='{$cols}'{$ew}>$encComment</textarea>
 854            {$this->uploadFormTextAfterSummary}
 855                         </td>
 856                 </tr>
 857                 <tr>
 858 EOT
 859                 );
 860
 861                 if ( $licenseshtml != '' ) {
 862                         global $wgStylePath;
 863                         $wgOut->addHTML( "
 864                         <td align='right'><label for='wpLicense'>$license:</label></td>
 865                         <td align='left'>
 866                                 <select name='wpLicense' id='wpLicense' tabindex='4'
 867                                         onchange='licenseSelectorCheck()'>
 868                                         <option value=''>$nolicense</option>
 869                                         $licenseshtml
 870                                 </select>
 871                         </td>
 872                         </tr>
 873                         <tr>" );
 874                         if( $useAjaxLicensePreview ) {
 875                                 $wgOut->addHtml( "
 876                                         <td></td>
 877                                         <td id=\"mw-license-preview\"></td>
 878                                 </tr>
 879                                 <tr>" );
 880                         }
 881                 }
 882
 883                 if ( $wgUseCopyrightUpload ) {
 884                         $filestatus = wfMsgHtml ( 'filestatus' );
 885                         $copystatus =  htmlspecialchars( $this->mCopyrightStatus );
 886                         $filesource = wfMsgHtml ( 'filesource' );
 887                         $uploadsource = htmlspecialchars( $this->mCopyrightSource );
 888
 889                         $wgOut->addHTML( "
 890                                 <td align='right' nowrap='nowrap'><label for='wpUploadCopyStatus'>$filestatus:</label></td>
 891                                         <td><input tabindex='5' type='text' name='wpUploadCopyStatus' id='wpUploadCopyStatus'
 892                                           value=\"$copystatus\" size='40' /></td>
 893                         </tr>
 894                         <tr>
 895                                 <td align='right'><label for='wpUploadCopyStatus'>$filesource:</label></td>
 896                                         <td><input tabindex='6' type='text' name='wpUploadSource' id='wpUploadCopyStatus'
 897                                           value=\"$uploadsource\" size='40' /></td>
 898                         </tr>
 899                         <tr>
 900                 ");
 901                 }
 902
 903                 $wgOut->addHtml( "
 904                 <td></td>
 905                 <td>
 906                         <input tabindex='7' type='checkbox' name='wpWatchthis' id='wpWatchthis' $watchChecked value='true' />
 907                         <label for='wpWatchthis'>" . wfMsgHtml( 'watchthisupload' ) . "</label>
 908                         <input tabindex='8' type='checkbox' name='wpIgnoreWarning' id='wpIgnoreWarning' value='true' $warningChecked/>
 909                         <label for='wpIgnoreWarning'>" . wfMsgHtml( 'ignorewarnings' ) . "</label>
 910                 </td>
 911         </tr>
 912         $warningRow
 913         <tr>
 914                 <td></td>
 915                 <td align='left'><input tabindex='9' type='submit' name='wpUpload' value=\"{$ulb}\" /></td>
 916         </tr>
 917         <tr>
 918                 <td></td>
 919                 <td align='left'>
 920                 " );
 921                 $wgOut->addWikiText( wfMsgForContent( 'edittools' ) );
 922                 $wgOut->addHTML( "
 923                 </td>
 924         </tr>
 925
 926         </table>
 927         <input type='hidden' name='wpDestFileWarningAck' id='wpDestFileWarningAck' value=''/>
 928         </form>" );
 929         }
 930
 931         /* -------------------------------------------------------------- */
 932
 933         /**
 934          * Split a file into a base name and all dot-delimited 'extensions'
 935          * on the end. Some web server configurations will fall back to
 936          * earlier pseudo-'extensions' to determine type and execute
 937          * scripts, so the blacklist needs to check them all.
 938          *
 939          * @return array
 940          */
 941         function splitExtensions( $filename ) {
 942                 $bits = explode( '.', $filename );
 943                 $basename = array_shift( $bits );
 944                 return array( $basename, $bits );
 945         }
 946
 947         /**
 948          * Perform case-insensitive match against a list of file extensions.
 949          * Returns true if the extension is in the list.
 950          *
 951          * @param string $ext
 952          * @param array $list
 953          * @return bool
 954          */
 955         function checkFileExtension( $ext, $list ) {
 956                 return in_array( strtolower( $ext ), $list );
 957         }
 958
 959         /**
 960          * Perform case-insensitive match against a list of file extensions.
 961          * Returns true if any of the extensions are in the list.
 962          *
 963          * @param array $ext
 964          * @param array $list
 965          * @return bool
 966          */
 967         function checkFileExtensionList( $ext, $list ) {
 968                 foreach( $ext as $e ) {
 969                         if( in_array( strtolower( $e ), $list ) ) {
 970                                 return true;
 971                         }
 972                 }
 973                 return false;
 974         }
 975
 976         /**
 977          * Verifies that it's ok to include the uploaded file
 978          *
 979          * @param string $tmpfile the full path of the temporary file to verify
 980          * @param string $extension The filename extension that the file is to be served with
 981          * @return mixed true of the file is verified, a WikiError object otherwise.
 982          */
 983         function verify( $tmpfile, $extension ) {
 984                 #magically determine mime type
 985                 $magic=& MimeMagic::singleton();
 986                 $mime= $magic->guessMimeType($tmpfile,false);
 987
 988                 #check mime type, if desired
 989                 global $wgVerifyMimeType;
 990                 if ($wgVerifyMimeType) {
 991
 992                   wfDebug ( "\n\nmime: <$mime> extension: <$extension>\n\n");
 993                         #check mime type against file extension
 994                         if( !$this->verifyExtension( $mime, $extension ) ) {
 995                                 return new WikiErrorMsg( 'uploadcorrupt' );
 996                         }
 997
 998                         #check mime type blacklist
 999                         global $wgMimeTypeBlacklist;
1000                         if( isset($wgMimeTypeBlacklist) && !is_null($wgMimeTypeBlacklist)
1001                                 && $this->checkFileExtension( $mime, $wgMimeTypeBlacklist ) ) {
1002                                 return new WikiErrorMsg( 'filetype-badmime', htmlspecialchars( $mime ) );
1003                         }
1004                 }
1005
1006                 #check for htmlish code and javascript
1007                 if( $this->detectScript ( $tmpfile, $mime, $extension ) ) {
1008                         return new WikiErrorMsg( 'uploadscripted' );
1009                 }
1010
1011                 /**
1012                 * Scan the uploaded file for viruses
1013                 */
1014                 $virus= $this->detectVirus($tmpfile);
1015                 if ( $virus ) {
1016                         return new WikiErrorMsg( 'uploadvirus', htmlspecialchars($virus) );
1017                 }
1018
1019                 wfDebug( __METHOD__.": all clear; passing.\n" );
1020                 return true;
1021         }
1022
1023         /**
1024          * Checks if the mime type of the uploaded file matches the file extension.
1025          *
1026          * @param string $mime the mime type of the uploaded file
1027          * @param string $extension The filename extension that the file is to be served with
1028          * @return bool
1029          */
1030         function verifyExtension( $mime, $extension ) {
1031                 $magic =& MimeMagic::singleton();
1032
1033                 if ( ! $mime || $mime == 'unknown' || $mime == 'unknown/unknown' )
1034                         if ( ! $magic->isRecognizableExtension( $extension ) ) {
1035                                 wfDebug( __METHOD__.": passing file with unknown detected mime type; " .
1036                                         "unrecognized extension '$extension', can't verify\n" );
1037                                 return true;
1038                         } else {
1039                                 wfDebug( __METHOD__.": rejecting file with unknown detected mime type; ".
1040                                         "recognized extension '$extension', so probably invalid file\n" );
1041                                 return false;
1042                         }
1043
1044                 $match= $magic->isMatchingExtension($extension,$mime);
1045
1046                 if ($match===NULL) {
1047                         wfDebug( __METHOD__.": no file extension known for mime type $mime, passing file\n" );
1048                         return true;
1049                 } elseif ($match===true) {
1050                         wfDebug( __METHOD__.": mime type $mime matches extension $extension, passing file\n" );
1051
1052                         #TODO: if it's a bitmap, make sure PHP or ImageMagic resp. can handle it!
1053                         return true;
1054
1055                 } else {
1056                         wfDebug( __METHOD__.": mime type $mime mismatches file extension $extension, rejecting file\n" );
1057                         return false;
1058                 }
1059         }
1060
1061         /**
1062          * Heuristic for detecting files that *could* contain JavaScript instructions or
1063          * things that may look like HTML to a browser and are thus
1064          * potentially harmful. The present implementation will produce false positives in some situations.
1065          *
1066          * @param string $file Pathname to the temporary upload file
1067          * @param string $mime The mime type of the file
1068          * @param string $extension The extension of the file
1069          * @return bool true if the file contains something looking like embedded scripts
1070          */
1071         function detectScript($file, $mime, $extension) {
1072                 global $wgAllowTitlesInSVG;
1073
1074                 #ugly hack: for text files, always look at the entire file.
1075                 #For binarie field, just check the first K.
1076
1077                 if (strpos($mime,'text/')===0) $chunk = file_get_contents( $file );
1078                 else {
1079                         $fp = fopen( $file, 'rb' );
1080                         $chunk = fread( $fp, 1024 );
1081                         fclose( $fp );
1082                 }
1083
1084                 $chunk= strtolower( $chunk );
1085
1086                 if (!$chunk) return false;
1087
1088                 #decode from UTF-16 if needed (could be used for obfuscation).
1089                 if (substr($chunk,0,2)=="\xfe\xff") $enc= "UTF-16BE";
1090                 elseif (substr($chunk,0,2)=="\xff\xfe") $enc= "UTF-16LE";
1091                 else $enc= NULL;
1092
1093                 if ($enc) $chunk= iconv($enc,"ASCII//IGNORE",$chunk);
1094
1095                 $chunk= trim($chunk);
1096
1097                 #FIXME: convert from UTF-16 if necessarry!
1098
1099                 wfDebug("SpecialUpload::detectScript: checking for embedded scripts and HTML stuff\n");
1100
1101                 #check for HTML doctype
1102                 if (eregi("<!DOCTYPE *X?HTML",$chunk)) return true;
1103
1104                 /**
1105                 * Internet Explorer for Windows performs some really stupid file type
1106                 * autodetection which can cause it to interpret valid image files as HTML
1107                 * and potentially execute JavaScript, creating a cross-site scripting
1108                 * attack vectors.
1109                 *
1110                 * Apple's Safari browser also performs some unsafe file type autodetection
1111                 * which can cause legitimate files to be interpreted as HTML if the
1112                 * web server is not correctly configured to send the right content-type
1113                 * (or if you're really uploading plain text and octet streams!)
1114                 *
1115                 * Returns true if IE is likely to mistake the given file for HTML.
1116                 * Also returns true if Safari would mistake the given file for HTML
1117                 * when served with a generic content-type.
1118                 */
1119
1120                 $tags = array(
1121                         '<body',
1122                         '<head',
1123                         '<html',   #also in safari
1124                         '<img',
1125                         '<pre',
1126                         '<script', #also in safari
1127                         '<table'
1128                         );
1129                 if( ! $wgAllowTitlesInSVG && $extension !== 'svg' && $mime !== 'image/svg' ) {
1130                         $tags[] = '<title';
1131                 }
1132
1133                 foreach( $tags as $tag ) {
1134                         if( false !== strpos( $chunk, $tag ) ) {
1135                                 return true;
1136                         }
1137                 }
1138
1139                 /*
1140                 * look for javascript
1141                 */
1142
1143                 #resolve entity-refs to look at attributes. may be harsh on big files... cache result?
1144                 $chunk = Sanitizer::decodeCharReferences( $chunk );
1145
1146                 #look for script-types
1147                 if (preg_match('!type\s*=\s*[\'"]?\s*(?:\w*/)?(?:ecma|java)!sim',$chunk)) return true;
1148
1149                 #look for html-style script-urls
1150                 if (preg_match('!(?:href|src|data)\s*=\s*[\'"]?\s*(?:ecma|java)script:!sim',$chunk)) return true;
1151
1152                 #look for css-style script-urls
1153                 if (preg_match('!url\s*\(\s*[\'"]?\s*(?:ecma|java)script:!sim',$chunk)) return true;
1154
1155                 wfDebug("SpecialUpload::detectScript: no scripts found\n");
1156                 return false;
1157         }
1158
1159         /**
1160          * Generic wrapper function for a virus scanner program.
1161          * This relies on the $wgAntivirus and $wgAntivirusSetup variables.
1162          * $wgAntivirusRequired may be used to deny upload if the scan fails.
1163          *
1164          * @param string $file Pathname to the temporary upload file
1165          * @return mixed false if not virus is found, NULL if the scan fails or is disabled,
1166          *         or a string containing feedback from the virus scanner if a virus was found.
1167          *         If textual feedback is missing but a virus was found, this function returns true.
1168          */
1169         function detectVirus($file) {
1170                 global $wgAntivirus, $wgAntivirusSetup, $wgAntivirusRequired, $wgOut;
1171
1172                 if ( !$wgAntivirus ) {
1173                         wfDebug( __METHOD__.": virus scanner disabled\n");
1174                         return NULL;
1175                 }
1176
1177                 if ( !$wgAntivirusSetup[$wgAntivirus] ) {
1178                         wfDebug( __METHOD__.": unknown virus scanner: $wgAntivirus\n" );
1179                         # @TODO: localise
1180                         $wgOut->addHTML( "<div class='error'>Bad configuration: unknown virus scanner: <i>$wgAntivirus</i></div>\n" );
1181                         return "unknown antivirus: $wgAntivirus";
1182                 }
1183
1184                 # look up scanner configuration
1185                 $command = $wgAntivirusSetup[$wgAntivirus]["command"];
1186                 $exitCodeMap = $wgAntivirusSetup[$wgAntivirus]["codemap"];
1187                 $msgPattern = isset( $wgAntivirusSetup[$wgAntivirus]["messagepattern"] ) ?
1188                         $wgAntivirusSetup[$wgAntivirus]["messagepattern"] : null;
1189
1190                 if ( strpos( $command,"%f" ) === false ) {
1191                         # simple pattern: append file to scan
1192                         $command .= " " . wfEscapeShellArg( $file );
1193                 } else {
1194                         # complex pattern: replace "%f" with file to scan
1195                         $command = str_replace( "%f", wfEscapeShellArg( $file ), $command );
1196                 }
1197
1198                 wfDebug( __METHOD__.": running virus scan: $command \n" );
1199
1200                 # execute virus scanner
1201                 $exitCode = false;
1202
1203                 #NOTE: there's a 50 line workaround to make stderr redirection work on windows, too.
1204                 #      that does not seem to be worth the pain.
1205                 #      Ask me (Duesentrieb) about it if it's ever needed.
1206                 $output = array();
1207                 if ( wfIsWindows() ) {
1208                         exec( "$command", $output, $exitCode );
1209                 } else {
1210                         exec( "$command 2>&1", $output, $exitCode );
1211                 }
1212
1213                 # map exit code to AV_xxx constants.
1214                 $mappedCode = $exitCode;
1215                 if ( $exitCodeMap ) {
1216                         if ( isset( $exitCodeMap[$exitCode] ) ) {
1217                                 $mappedCode = $exitCodeMap[$exitCode];
1218                         } elseif ( isset( $exitCodeMap["*"] ) ) {
1219                                 $mappedCode = $exitCodeMap["*"];
1220                         }
1221                 }
1222
1223                 if ( $mappedCode === AV_SCAN_FAILED ) {
1224                         # scan failed (code was mapped to false by $exitCodeMap)
1225                         wfDebug( __METHOD__.": failed to scan $file (code $exitCode).\n" );
1226
1227                         if ( $wgAntivirusRequired ) {
1228                                 return "scan failed (code $exitCode)";
1229                         } else {
1230                                 return NULL;
1231                         }
1232                 } else if ( $mappedCode === AV_SCAN_ABORTED ) {
1233                         # scan failed because filetype is unknown (probably imune)
1234                         wfDebug( __METHOD__.": unsupported file type $file (code $exitCode).\n" );
1235                         return NULL;
1236                 } else if ( $mappedCode === AV_NO_VIRUS ) {
1237                         # no virus found
1238                         wfDebug( __METHOD__.": file passed virus scan.\n" );
1239                         return false;
1240                 } else {
1241                         $output = join( "\n", $output );
1242                         $output = trim( $output );
1243
1244                         if ( !$output ) {
1245                                 $output = true; #if there's no output, return true
1246                         } elseif ( $msgPattern ) {
1247                                 $groups = array();
1248                                 if ( preg_match( $msgPattern, $output, $groups ) ) {
1249                                         if ( $groups[1] ) {
1250                                                 $output = $groups[1];
1251                                         }
1252                                 }
1253                         }
1254
1255                         wfDebug( __METHOD__.": FOUND VIRUS! scanner feedback: $output" );
1256                         return $output;
1257                 }
1258         }
1259
1260         /**
1261          * Check if the temporary file is MacBinary-encoded, as some uploads
1262          * from Internet Explorer on Mac OS Classic and Mac OS X will be.
1263          * If so, the data fork will be extracted to a second temporary file,
1264          * which will then be checked for validity and either kept or discarded.
1265          *
1266          * @access private
1267          */
1268         function checkMacBinary() {
1269                 $macbin = new MacBinary( $this->mTempPath );
1270                 if( $macbin->isValid() ) {
1271                         $dataFile = tempnam( wfTempDir(), "WikiMacBinary" );
1272                         $dataHandle = fopen( $dataFile, 'wb' );
1273
1274                         wfDebug( "SpecialUpload::checkMacBinary: Extracting MacBinary data fork to $dataFile\n" );
1275                         $macbin->extractData( $dataHandle );
1276
1277                         $this->mTempPath = $dataFile;
1278                         $this->mFileSize = $macbin->dataForkLength();
1279
1280                         // We'll have to manually remove the new file if it's not kept.
1281                         $this->mRemoveTempFile = true;
1282                 }
1283                 $macbin->close();
1284         }
1285
1286         /**
1287          * If we've modified the upload file we need to manually remove it
1288          * on exit to clean up.
1289          * @access private
1290          */
1291         function cleanupTempFile() {
1292                 if ( $this->mRemoveTempFile && file_exists( $this->mTempPath ) ) {
1293                         wfDebug( "SpecialUpload::cleanupTempFile: Removing temporary file {$this->mTempPath}\n" );
1294                         unlink( $this->mTempPath );
1295                 }
1296         }
1297
1298         /**
1299          * Check if there's an overwrite conflict and, if so, if restrictions
1300          * forbid this user from performing the upload.
1301          *
1302          * @return mixed true on success, WikiError on failure
1303          * @access private
1304          */
1305         function checkOverwrite( $name ) {
1306                 $img = wfFindFile( $name );
1307
1308                 $error = '';
1309                 if( $img ) {
1310                         global $wgUser, $wgOut;
1311                         if( $img->isLocal() ) {
1312                                 if( !self::userCanReUpload( $wgUser, $img->name ) ) {
1313                                         $error = 'fileexists-forbidden';
1314                                 }
1315                         } else {
1316                                 if( !$wgUser->isAllowed( 'reupload' ) ||
1317                                     !$wgUser->isAllowed( 'reupload-shared' ) ) {
1318                                         $error = "fileexists-shared-forbidden";
1319                                 }
1320                         }
1321                 }
1322
1323                 if( $error ) {
1324                         $errorText = wfMsg( $error, wfEscapeWikiText( $img->getName() ) );
1325                         return new WikiError( $wgOut->parse( $errorText ) );
1326                 }
1327
1328                 // Rockin', go ahead and upload
1329                 return true;
1330         }
1331
1332          /**
1333          * Check if a user is the last uploader
1334          *
1335          * @param User $user
1336          * @param string $img, image name
1337          * @return bool
1338          */
1339         public static function userCanReUpload( User $user, $img ) {
1340                 if( $user->isAllowed( 'reupload' ) )
1341                         return true; // non-conditional
1342                 if( !$user->isAllowed( 'reupload-own' ) )
1343                         return false;
1344
1345                 $dbr = wfGetDB( DB_SLAVE );
1346                 $row = $dbr->selectRow('image',
1347                 /* SELECT */ 'img_user',
1348                 /* WHERE */ array( 'img_name' => $img )
1349                 );
1350                 if ( !$row )
1351                         return false;
1352
1353                 return $user->getID() == $row->img_user;
1354         }
1355
1356         /**
1357          * Display an error with a wikitext description
1358          */
1359         function showError( $description ) {
1360                 global $wgOut;
1361                 $wgOut->setPageTitle( wfMsg( "internalerror" ) );
1362                 $wgOut->setRobotpolicy( "noindex,nofollow" );
1363                 $wgOut->setArticleRelated( false );
1364                 $wgOut->enableClientCache( false );
1365                 $wgOut->addWikiText( $description );
1366         }
1367
1368         /**
1369          * Get the initial image page text based on a comment and optional file status information
1370          */
1371         static function getInitialPageText( $comment, $license, $copyStatus, $source ) {
1372                 global $wgUseCopyrightUpload;
1373                 if ( $wgUseCopyrightUpload ) {
1374                         if ( $license != '' ) {
1375                                 $licensetxt = '== ' . wfMsgForContent( 'license' ) . " ==\n" . '{{' . $license . '}}' . "\n";
1376                         }
1377                         $pageText = '== ' . wfMsg ( 'filedesc' ) . " ==\n" . $comment . "\n" .
1378                           '== ' . wfMsgForContent ( 'filestatus' ) . " ==\n" . $copyStatus . "\n" .
1379                           "$licensetxt" .
1380                           '== ' . wfMsgForContent ( 'filesource' ) . " ==\n" . $source ;
1381                 } else {
1382                         if ( $license != '' ) {
1383                                 $filedesc = $comment == '' ? '' : '== ' . wfMsg ( 'filedesc' ) . " ==\n" . $comment . "\n";
1384                                  $pageText = $filedesc .
1385                                          '== ' . wfMsgForContent ( 'license' ) . " ==\n" . '{{' . $license . '}}' . "\n";
1386                         } else {
1387                                 $pageText = $comment;
1388                         }
1389                 }
1390                 return $pageText;
1391         }
1392 }
1393