mirror of
https://github.com/miniflux/v2.git
synced 2024-08-30 16:17:20 +02:00
114 lines
3.4 KiB
Go
114 lines
3.4 KiB
Go
|
// 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)
|
||
|
}
|