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// 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}
}
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