Add Slack support

1 files changed, 113 insertions, 0 deletions

diff --git a/vendor/golang.org/x/net/websocket/server.go b/vendor/golang.org/x/net/websocket/server.go
new file mode 100644
index 00000000..0895dea1
--- /dev/null
+++ b/vendor/golang.org/x/net/websocket/server.go
@@ -0,0 +1,113 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package websocket
+
+import (
+	"bufio"
+	"fmt"
+	"io"
+	"net/http"
+)
+
+func newServerConn(rwc io.ReadWriteCloser, buf *bufio.ReadWriter, req *http.Request, config *Config, handshake func(*Config, *http.Request) error) (conn *Conn, err error) {
+	var hs serverHandshaker = &hybiServerHandshaker{Config: config}
+	code, err := hs.ReadHandshake(buf.Reader, req)
+	if err == ErrBadWebSocketVersion {
+		fmt.Fprintf(buf, "HTTP/1.1 %03d %s\r\n", code, http.StatusText(code))
+		fmt.Fprintf(buf, "Sec-WebSocket-Version: %s\r\n", SupportedProtocolVersion)
+		buf.WriteString("\r\n")
+		buf.WriteString(err.Error())
+		buf.Flush()
+		return
+	}
+	if err != nil {
+		fmt.Fprintf(buf, "HTTP/1.1 %03d %s\r\n", code, http.StatusText(code))
+		buf.WriteString("\r\n")
+		buf.WriteString(err.Error())
+		buf.Flush()
+		return
+	}
+	if handshake != nil {
+		err = handshake(config, req)
+		if err != nil {
+			code = http.StatusForbidden
+			fmt.Fprintf(buf, "HTTP/1.1 %03d %s\r\n", code, http.StatusText(code))
+			buf.WriteString("\r\n")
+			buf.Flush()
+			return
+		}
+	}
+	err = hs.AcceptHandshake(buf.Writer)
+	if err != nil {
+		code = http.StatusBadRequest
+		fmt.Fprintf(buf, "HTTP/1.1 %03d %s\r\n", code, http.StatusText(code))
+		buf.WriteString("\r\n")
+		buf.Flush()
+		return
+	}
+	conn = hs.NewServerConn(buf, rwc, req)
+	return
+}
+
+// Server represents a server of a WebSocket.
+type Server struct {
+	// Config is a WebSocket configuration for new WebSocket connection.
+	Config
+
+	// Handshake is an optional function in WebSocket handshake.
+	// For example, you can check, or don't check Origin header.
+	// Another example, you can select config.Protocol.
+	Handshake func(*Config, *http.Request) error
+
+	// Handler handles a WebSocket connection.
+	Handler
+}
+
+// ServeHTTP implements the http.Handler interface for a WebSocket
+func (s Server) ServeHTTP(w http.ResponseWriter, req *http.Request) {
+	s.serveWebSocket(w, req)
+}
+
+func (s Server) serveWebSocket(w http.ResponseWriter, req *http.Request) {
+	rwc, buf, err := w.(http.Hijacker).Hijack()
+	if err != nil {
+		panic("Hijack failed: " + err.Error())
+	}
+	// The server should abort the WebSocket connection if it finds
+	// the client did not send a handshake that matches with protocol
+	// specification.
+	defer rwc.Close()
+	conn, err := newServerConn(rwc, buf, req, &s.Config, s.Handshake)
+	if err != nil {
+		return
+	}
+	if conn == nil {
+		panic("unexpected nil conn")
+	}
+	s.Handler(conn)
+}
+
+// Handler is a simple interface to a WebSocket browser client.
+// It checks if Origin header is valid URL by default.
+// You might want to verify websocket.Conn.Config().Origin in the func.
+// If you use Server instead of Handler, you could call websocket.Origin and
+// check the origin in your Handshake func. So, if you want to accept
+// non-browser clients, which do not send an Origin header, set a
+// Server.Handshake that does not check the origin.
+type Handler func(*Conn)
+
+func checkOrigin(config *Config, req *http.Request) (err error) {
+	config.Origin, err = Origin(config, req)
+	if err == nil && config.Origin == nil {
+		return fmt.Errorf("null origin")
+	}
+	return err
+}
+
+// ServeHTTP implements the http.Handler interface for a WebSocket
+func (h Handler) ServeHTTP(w http.ResponseWriter, req *http.Request) {
+	s := Server{Handler: h, Handshake: checkOrigin}
+	s.serveWebSocket(w, req)
+}