Although this PHP script ($encScript) exists, the file requested for output - ($encFile) does not.
- - "; + self::send404Message( $fname, $flags ); } return false; } - // Sent Last-Modified HTTP header for client-side caching - header( 'Last-Modified: ' . wfTimestamp( TS_RFC2822, $info['mtime'] ) ); + // Send Last-Modified HTTP header for client-side caching + $headerFunc( 'Last-Modified: ' . wfTimestamp( TS_RFC2822, $info['mtime'] ) ); - // Cancel output buffering and gzipping if set - wfResetOutputBuffers(); + if ( ( $flags & self::STREAM_ALLOW_OB ) == 0 ) { + // Cancel output buffering and gzipping if set + wfResetOutputBuffers(); + } - $type = self::contentTypeFromPath( $path ); + $type = self::contentTypeFromPath( $fname ); if ( $type && $type != 'unknown/unknown' ) { - header( "Content-type: $type" ); + $headerFunc( "Content-type: $type" ); } else { // Send a content type which is not known to Internet Explorer, to // avoid triggering IE's content type detection. Sending a standard // unknown content type here essentially gives IE license to apply // whatever content type it likes. - header( 'Content-type: application/x-wiki' ); + $headerFunc( 'Content-type: application/x-wiki' ); } - // Don't stream it out as text/html if there was a PHP error - if ( headers_sent() ) { - echo "Headers already sent, terminating.\n"; - return false; + // Don't send if client has up to date cache + if ( isset( $optHeaders['if-modified-since'] ) ) { + $modsince = preg_replace( '/;.*$/', '', $optHeaders['if-modified-since'] ); + if ( wfTimestamp( TS_UNIX, $info['mtime'] ) <= strtotime( $modsince ) ) { + ini_set( 'zlib.output_compression', 0 ); + $headerFunc( 304 ); + return true; // ok + } } // Send additional headers foreach ( $headers as $header ) { - header( $header ); + header( $header ); // always use header(); specifically requested } - // Don't send if client has up to date cache - if ( !empty( $_SERVER['HTTP_IF_MODIFIED_SINCE'] ) ) { - $modsince = preg_replace( '/;.*$/', '', $_SERVER['HTTP_IF_MODIFIED_SINCE'] ); - if ( wfTimestamp( TS_UNIX, $info['mtime'] ) <= strtotime( $modsince ) ) { - ini_set( 'zlib.output_compression', 0 ); - header( "HTTP/1.0 304 Not Modified" ); - return self::NOT_MODIFIED; // ok + if ( isset( $optHeaders['range'] ) ) { + $range = self::parseRange( $optHeaders['range'], $info['size'] ); + if ( is_array( $range ) ) { + $headerFunc( 206 ); + $headerFunc( 'Content-Length: ' . $range[2] ); + $headerFunc( "Content-Range: bytes {$range[0]}-{$range[1]}/{$info['size']}" ); + } elseif ( $range === 'invalid' ) { + if ( $sendErrors ) { + $headerFunc( 416 ); + $headerFunc( 'Cache-Control: no-cache' ); + $headerFunc( 'Content-Type: text/html; charset=utf-8' ); + $headerFunc( 'Content-Range: bytes */' . $info['size'] ); + } + return false; + } else { // unsupported Range request (e.g. multiple ranges) + $range = null; + $headerFunc( 'Content-Length: ' . $info['size'] ); } + } else { + $range = null; + $headerFunc( 'Content-Length: ' . $info['size'] ); } - header( 'Content-Length: ' . $info['size'] ); + if ( is_array( $range ) ) { + $handle = fopen( $fname, 'rb' ); + if ( $handle ) { + $ok = true; + fseek( $handle, $range[0] ); + $remaining = $range[2]; + while ( $remaining > 0 && $ok ) { + $bytes = min( $remaining, 8 * 1024 ); + $data = fread( $handle, $bytes ); + $remaining -= $bytes; + $ok = ( $data !== false ); + print $data; + } + } else { + return false; + } + } else { + return readfile( $fname ) !== false; // faster + } + + return true; + } + + /** + * Send out a standard 404 message for a file + * + * @param string $fname Full name and path of the file to stream + * @param integer $flags Bitfield of STREAM_* constants + * @since 1.24 + */ + public static function send404Message( $fname, $flags = 0 ) { + if ( ( $flags & self::STREAM_HEADLESS ) == 0 ) { + HttpStatus::header( 404 ); + header( 'Cache-Control: no-cache' ); + header( 'Content-Type: text/html; charset=utf-8' ); + } + $encFile = htmlspecialchars( $fname ); + $encScript = htmlspecialchars( $_SERVER['SCRIPT_NAME'] ); + echo " +Although this PHP script ($encScript) exists, the file requested for output + ($encFile) does not.
+ + "; + } - return self::READY_STREAM; // ok + /** + * Convert a Range header value to an absolute (start, end) range tuple + * + * @param string $range Range header value + * @param integer $size File size + * @return array|string Returns error string on failure (start, end, length) + * @since 1.24 + */ + public static function parseRange( $range, $size ) { + $m = []; + if ( preg_match( '#^bytes=(\d*)-(\d*)$#', $range, $m ) ) { + list( , $start, $end ) = $m; + if ( $start === '' && $end === '' ) { + $absRange = [ 0, $size - 1 ]; + } elseif ( $start === '' ) { + $absRange = [ $size - $end, $size - 1 ]; + } elseif ( $end === '' ) { + $absRange = [ $start, $size - 1 ]; + } else { + $absRange = [ $start, $end ]; + } + if ( $absRange[0] >= 0 && $absRange[1] >= $absRange[0] ) { + if ( $absRange[0] < $size ) { + $absRange[1] = min( $absRange[1], $size - 1 ); // stop at EOF + $absRange[2] = $absRange[1] - $absRange[0] + 1; + return $absRange; + } elseif ( $absRange[0] == 0 && $size == 0 ) { + return 'unrecognized'; // the whole file should just be sent + } + } + return 'invalid'; + } + return 'unrecognized'; } /**