File: proxy.go

package info (click to toggle)
golang-github-gorilla-websocket 1.4.1-1
  • links: PTS, VCS
  • area: main
  • in suites: bullseye
  • size: 392 kB
  • sloc: makefile: 3
file content (77 lines) | stat: -rw-r--r-- 1,951 bytes parent folder | download | duplicates (5)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
// 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"
	"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: "CONNECT",
		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
	}

	if resp.StatusCode != 200 {
		conn.Close()
		f := strings.SplitN(resp.Status, " ", 2)
		return nil, errors.New(f[1])
	}
	return conn, nil
}