113 lines
2.6 KiB
Go
113 lines
2.6 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"
|
|
"crypto/tls"
|
|
"io"
|
|
"net"
|
|
"net/http"
|
|
"net/url"
|
|
)
|
|
|
|
// DialError is an error that occurs while dialling a websocket server.
|
|
type DialError struct {
|
|
*Config
|
|
Err error
|
|
}
|
|
|
|
func (e *DialError) Error() string {
|
|
return "websocket.Dial " + e.Config.Location.String() + ": " + e.Err.Error()
|
|
}
|
|
|
|
// NewConfig creates a new WebSocket config for client connection.
|
|
func NewConfig(server, origin string) (config *Config, err error) {
|
|
config = new(Config)
|
|
config.Version = ProtocolVersionHybi13
|
|
config.Location, err = url.ParseRequestURI(server)
|
|
if err != nil {
|
|
return
|
|
}
|
|
config.Origin, err = url.ParseRequestURI(origin)
|
|
if err != nil {
|
|
return
|
|
}
|
|
config.Header = http.Header(make(map[string][]string))
|
|
return
|
|
}
|
|
|
|
// NewClient creates a new WebSocket client connection over rwc.
|
|
func NewClient(config *Config, rwc io.ReadWriteCloser) (ws *Conn, err error) {
|
|
br := bufio.NewReader(rwc)
|
|
bw := bufio.NewWriter(rwc)
|
|
err = hybiClientHandshake(config, br, bw)
|
|
if err != nil {
|
|
return
|
|
}
|
|
buf := bufio.NewReadWriter(br, bw)
|
|
ws = newHybiClientConn(config, buf, rwc)
|
|
return
|
|
}
|
|
|
|
// Dial opens a new client connection to a WebSocket.
|
|
func Dial(url_, protocol, origin string) (ws *Conn, err error) {
|
|
config, err := NewConfig(url_, origin)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
if protocol != "" {
|
|
config.Protocol = []string{protocol}
|
|
}
|
|
return DialConfig(config)
|
|
}
|
|
|
|
var portMap = map[string]string{
|
|
"ws": "80",
|
|
"wss": "443",
|
|
}
|
|
|
|
func parseAuthority(location *url.URL) string {
|
|
if _, ok := portMap[location.Scheme]; ok {
|
|
if _, _, err := net.SplitHostPort(location.Host); err != nil {
|
|
return net.JoinHostPort(location.Host, portMap[location.Scheme])
|
|
}
|
|
}
|
|
return location.Host
|
|
}
|
|
|
|
// DialConfig opens a new client connection to a WebSocket with a config.
|
|
func DialConfig(config *Config) (ws *Conn, err error) {
|
|
var client net.Conn
|
|
if config.Location == nil {
|
|
return nil, &DialError{config, ErrBadWebSocketLocation}
|
|
}
|
|
if config.Origin == nil {
|
|
return nil, &DialError{config, ErrBadWebSocketOrigin}
|
|
}
|
|
switch config.Location.Scheme {
|
|
case "ws":
|
|
client, err = net.Dial("tcp", parseAuthority(config.Location))
|
|
|
|
case "wss":
|
|
client, err = tls.Dial("tcp", parseAuthority(config.Location), config.TlsConfig)
|
|
|
|
default:
|
|
err = ErrBadScheme
|
|
}
|
|
if err != nil {
|
|
goto Error
|
|
}
|
|
|
|
ws, err = NewClient(config, client)
|
|
if err != nil {
|
|
client.Close()
|
|
goto Error
|
|
}
|
|
return
|
|
|
|
Error:
|
|
return nil, &DialError{config, err}
|
|
}
|