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// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package websocket
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import (
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"http"
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"io"
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)
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// Handler is a interface that use a WebSocket.
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//
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// A trivial example server is:
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//
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// package main
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//
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// import (
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// "http"
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// "io"
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// "websocket"
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// )
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//
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// // echo back the websocket.
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// func EchoServer(ws *websocket.Conn) {
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// io.Copy(ws, ws);
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// }
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//
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// func main() {
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// http.Handle("/echo", websocket.Handler(EchoServer));
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// err := http.ListenAndServe(":12345", nil);
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// if err != nil {
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// panic("ListenAndServe: ", err.String())
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// }
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// }
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type Handler func(*Conn)
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func (f Handler) ServeHTTP(c *http.Conn, req *http.Request) {
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if req.Method != "GET" || req.Proto != "HTTP/1.1" ||
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req.Header["Upgrade"] != "WebSocket" ||
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req.Header["Connection"] != "Upgrade" {
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c.WriteHeader(http.StatusNotFound)
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io.WriteString(c, "must use websocket to connect here")
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return
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}
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rwc, buf, err := c.Hijack()
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if err != nil {
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panic("Hijack failed: ", err.String())
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return
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}
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defer rwc.Close()
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origin := req.Header["Origin"]
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location := "ws://" + req.Host + req.URL.Path
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// TODO(ukai): verify origin,location,protocol.
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buf.WriteString("HTTP/1.1 101 Web Socket Protocol Handshake\r\n")
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buf.WriteString("Upgrade: WebSocket\r\n")
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buf.WriteString("Connection: Upgrade\r\n")
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buf.WriteString("WebSocket-Origin: " + origin + "\r\n")
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buf.WriteString("WebSocket-Location: " + location + "\r\n")
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protocol := ""
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// canonical header key of WebSocket-Protocol.
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if protocol, found := req.Header["Websocket-Protocol"]; found {
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buf.WriteString("WebSocket-Protocol: " + protocol + "\r\n")
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}
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buf.WriteString("\r\n")
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if err := buf.Flush(); err != nil {
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return
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}
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ws := newConn(origin, location, protocol, buf, rwc)
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f(ws)
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}
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