1 // Copyright 2009 The Go Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style
3 // license that can be found in the LICENSE file.
14 func newServerConn(rwc io.ReadWriteCloser, buf *bufio.ReadWriter, req *http.Request, config *Config, handshake func(*Config, *http.Request) error) (conn *Conn, err error) {
15 var hs serverHandshaker = &hybiServerHandshaker{Config: config}
16 code, err := hs.ReadHandshake(buf.Reader, req)
17 if err == ErrBadWebSocketVersion {
18 fmt.Fprintf(buf, "HTTP/1.1 %03d %s\r\n", code, http.StatusText(code))
19 fmt.Fprintf(buf, "Sec-WebSocket-Version: %s\r\n", SupportedProtocolVersion)
20 buf.WriteString("\r\n")
21 buf.WriteString(err.Error())
26 fmt.Fprintf(buf, "HTTP/1.1 %03d %s\r\n", code, http.StatusText(code))
27 buf.WriteString("\r\n")
28 buf.WriteString(err.Error())
33 err = handshake(config, req)
35 code = http.StatusForbidden
36 fmt.Fprintf(buf, "HTTP/1.1 %03d %s\r\n", code, http.StatusText(code))
37 buf.WriteString("\r\n")
42 err = hs.AcceptHandshake(buf.Writer)
44 code = http.StatusBadRequest
45 fmt.Fprintf(buf, "HTTP/1.1 %03d %s\r\n", code, http.StatusText(code))
46 buf.WriteString("\r\n")
50 conn = hs.NewServerConn(buf, rwc, req)
54 // Server represents a server of a WebSocket.
56 // Config is a WebSocket configuration for new WebSocket connection.
59 // Handshake is an optional function in WebSocket handshake.
60 // For example, you can check, or don't check Origin header.
61 // Another example, you can select config.Protocol.
62 Handshake func(*Config, *http.Request) error
64 // Handler handles a WebSocket connection.
68 // ServeHTTP implements the http.Handler interface for a WebSocket
69 func (s Server) ServeHTTP(w http.ResponseWriter, req *http.Request) {
70 s.serveWebSocket(w, req)
73 func (s Server) serveWebSocket(w http.ResponseWriter, req *http.Request) {
74 rwc, buf, err := w.(http.Hijacker).Hijack()
76 panic("Hijack failed: " + err.Error())
78 // The server should abort the WebSocket connection if it finds
79 // the client did not send a handshake that matches with protocol
82 conn, err := newServerConn(rwc, buf, req, &s.Config, s.Handshake)
87 panic("unexpected nil conn")
92 // Handler is a simple interface to a WebSocket browser client.
93 // It checks if Origin header is valid URL by default.
94 // You might want to verify websocket.Conn.Config().Origin in the func.
95 // If you use Server instead of Handler, you could call websocket.Origin and
96 // check the origin in your Handshake func. So, if you want to accept
97 // non-browser clients, which do not send an Origin header, set a
98 // Server.Handshake that does not check the origin.
99 type Handler func(*Conn)
101 func checkOrigin(config *Config, req *http.Request) (err error) {
102 config.Origin, err = Origin(config, req)
103 if err == nil && config.Origin == nil {
104 return fmt.Errorf("null origin")
109 // ServeHTTP implements the http.Handler interface for a WebSocket
110 func (h Handler) ServeHTTP(w http.ResponseWriter, req *http.Request) {
111 s := Server{Handler: h, Handshake: checkOrigin}
112 s.serveWebSocket(w, req)