$value ) { if ( strtolower( $name ) == 'content-type' && strpos( $value, 'text/html' ) === false && strpos( $value, 'application/xhtml+xml' ) === false ) { $isHTML = false; break; } } if ( $isHTML ) { $s = wfHtmlValidationHandler( $s ); } } if ( !$wgDisableOutputCompression && !ini_get( 'zlib.output_compression' ) ) { if ( !defined( 'MW_NO_OUTPUT_COMPRESSION' ) ) { $s = wfGzipHandler( $s ); } if ( !ini_get( 'output_handler' ) ) { wfDoContentLength( strlen( $s ) ); } } return $s; } /** * Get the "file extension" that some client apps will estimate from * the currently-requested URL. * This isn't on WebRequest because we need it when things aren't initialized * @private */ function wfRequestExtension() { /// @todo Fixme: this sort of dupes some code in WebRequest::getRequestUrl() if( isset( $_SERVER['REQUEST_URI'] ) ) { // Strip the query string... list( $path ) = explode( '?', $_SERVER['REQUEST_URI'], 2 ); } elseif( isset( $_SERVER['SCRIPT_NAME'] ) ) { // Probably IIS. QUERY_STRING appears separately. $path = $_SERVER['SCRIPT_NAME']; } else { // Can't get the path from the server? :( return ''; } $period = strrpos( $path, '.' ); if( $period !== false ) { return strtolower( substr( $path, $period ) ); } return ''; } /** * Handler that compresses data with gzip if allowed by the Accept header. * Unlike ob_gzhandler, it works for HEAD requests too. */ function wfGzipHandler( $s ) { if( !function_exists( 'gzencode' ) || headers_sent() ) { return $s; } $ext = wfRequestExtension(); if( $ext == '.gz' || $ext == '.tgz' ) { // Don't do gzip compression if the URL path ends in .gz or .tgz // This confuses Safari and triggers a download of the page, // even though it's pretty clearly labeled as viewable HTML. // Bad Safari! Bad! return $s; } if( wfClientAcceptsGzip() ) { header( 'Content-Encoding: gzip' ); $s = gzencode( $s, 6 ); } // Set vary header if it hasn't been set already $headers = headers_list(); $foundVary = false; foreach ( $headers as $header ) { if ( substr( $header, 0, 5 ) == 'Vary:' ) { $foundVary = true; break; } } if ( !$foundVary ) { header( 'Vary: Accept-Encoding' ); global $wgUseXVO; if ( $wgUseXVO ) { header( 'X-Vary-Options: Accept-Encoding;list-contains=gzip' ); } } return $s; } /** * Mangle flash policy tags which open up the site to XSS attacks. */ function wfMangleFlashPolicy( $s ) { # Avoid weird excessive memory usage in PCRE on big articles if ( preg_match( '/\<\s*cross-domain-policy\s*\>/i', $s ) ) { return preg_replace( '/\<\s*cross-domain-policy\s*\>/i', '', $s ); } else { return $s; } } /** * Add a Content-Length header if possible. This makes it cooperate with squid better. */ function wfDoContentLength( $length ) { if ( !headers_sent() && $_SERVER['SERVER_PROTOCOL'] == 'HTTP/1.0' ) { header( "Content-Length: $length" ); } } /** * Replace the output with an error if the HTML is not valid */ function wfHtmlValidationHandler( $s ) { $errors = ''; if ( MWTidy::checkErrors( $s, $errors ) ) { return $s; } header( 'Cache-Control: no-cache' ); $out = << HTML validation error

HTML validation error

'; $out .= '
' . htmlspecialchars( $errors ) . '
'; $out .= "
    \n"; $line = strtok( $s, "\n" ); $i = 1; while ( $line !== false ) { if ( isset( $badLines[$i] ) ) { $out .= "
  1. "; } else { $out .= '
  2. '; } $out .= htmlspecialchars( $line ) . "
    3. \n"; $line = strtok( "\n" ); $i++; } $out .= '
'; return $out; }