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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,95 @@ | ||
| // 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 main | ||
|
|
||
| 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 | ||
| }) | ||
| } | ||
|
|
||
| func hostPortNoPort(u *url.URL) (hostPort, hostNoPort string) { | ||
| hostPort = u.Host | ||
| hostNoPort = u.Host | ||
| if i := strings.LastIndex(u.Host, ":"); i > strings.LastIndex(u.Host, "]") { | ||
| hostNoPort = hostNoPort[:i] | ||
| } else { | ||
| switch u.Scheme { | ||
| case "wss": | ||
| hostPort += ":443" | ||
| case "https": | ||
| hostPort += ":443" | ||
| default: | ||
| hostPort += ":80" | ||
| } | ||
| } | ||
| return hostPort, hostNoPort | ||
| } | ||
|
|
||
| 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 | ||
| } | ||
|
|
||
| if resp.StatusCode != 200 { | ||
| conn.Close() | ||
| f := strings.SplitN(resp.Status, " ", 2) | ||
| return nil, errors.New(f[1]) | ||
| } | ||
| return conn, nil | ||
| } |
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