mirror of https://github.com/gorilla/websocket.git
89 lines
2.4 KiB
Go
89 lines
2.4 KiB
Go
// Copyright 2017 The Gorilla WebSocket 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"
|
|
"bytes"
|
|
"encoding/base64"
|
|
"errors"
|
|
"net"
|
|
"net/http"
|
|
"net/url"
|
|
"strings"
|
|
)
|
|
|
|
type netDialerFunc func(network, addr string) (net.Conn, error)
|
|
|
|
func (fn netDialerFunc) Dial(network, addr string) (net.Conn, error) {
|
|
return fn(network, addr)
|
|
}
|
|
|
|
func init() {
|
|
proxy_RegisterDialerType("http", func(proxyURL *url.URL, forwardDialer proxy_Dialer) (proxy_Dialer, error) {
|
|
return &httpProxyDialer{proxyURL: proxyURL, forwardDial: forwardDialer.Dial}, nil
|
|
})
|
|
}
|
|
|
|
type httpProxyDialer struct {
|
|
proxyURL *url.URL
|
|
forwardDial func(network, addr string) (net.Conn, error)
|
|
}
|
|
|
|
func (hpd *httpProxyDialer) Dial(network string, addr string) (net.Conn, error) {
|
|
hostPort, _ := hostPortNoPort(hpd.proxyURL)
|
|
conn, err := hpd.forwardDial(network, hostPort)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
connectHeader := make(http.Header)
|
|
if user := hpd.proxyURL.User; user != nil {
|
|
proxyUser := user.Username()
|
|
if proxyPassword, passwordSet := user.Password(); passwordSet {
|
|
credential := base64.StdEncoding.EncodeToString([]byte(proxyUser + ":" + proxyPassword))
|
|
connectHeader.Set("Proxy-Authorization", "Basic "+credential)
|
|
}
|
|
}
|
|
|
|
connectReq := &http.Request{
|
|
Method: http.MethodConnect,
|
|
URL: &url.URL{Opaque: addr},
|
|
Host: addr,
|
|
Header: connectHeader,
|
|
}
|
|
|
|
if err := connectReq.Write(conn); err != nil {
|
|
conn.Close()
|
|
return nil, err
|
|
}
|
|
|
|
// Read response. It's OK to use and discard buffered reader here becaue
|
|
// the remote server does not speak until spoken to.
|
|
br := bufio.NewReader(conn)
|
|
resp, err := http.ReadResponse(br, connectReq)
|
|
if err != nil {
|
|
conn.Close()
|
|
return nil, err
|
|
}
|
|
|
|
// Close the response body to silence false positives from linters. Reset
|
|
// the buffered reader first to ensure that Close() does not read from
|
|
// conn.
|
|
// Note: Applications must call resp.Body.Close() on a response returned
|
|
// http.ReadResponse to inspect trailers or read another response from the
|
|
// buffered reader. The call to resp.Body.Close() does not release
|
|
// resources.
|
|
br.Reset(bytes.NewReader(nil))
|
|
_ = resp.Body.Close()
|
|
|
|
if resp.StatusCode != http.StatusOK {
|
|
_ = conn.Close()
|
|
f := strings.SplitN(resp.Status, " ", 2)
|
|
return nil, errors.New(f[1])
|
|
}
|
|
return conn, nil
|
|
}
|