/
http_proxy.go
98 lines (86 loc) · 2.61 KB
/
http_proxy.go
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package konnectivitysocks5proxy
import (
"bufio"
"encoding/base64"
"errors"
"net"
"net/http"
"net/url"
"os"
"strings"
"golang.org/x/net/proxy"
)
func init() {
// The proxy package only interprets the ALL_PROXY variable. This is only used
// for cloud provider endpoints, so use the https proxy.
os.Setenv("ALL_PROXY", os.Getenv("HTTPS_PROXY"))
// The proxy itself might be using either http or https though, so we have to
// register both dialers.
proxy.RegisterDialerType("http", newHttpDialer)
proxy.RegisterDialerType("https", newHttpDialer)
}
func newHttpDialer(proxyURL *url.URL, forwardDialer proxy.Dialer) (proxy.Dialer, error) {
return &httpProxyDialer{proxyURL: proxyURL, forwardDial: forwardDialer.Dial}, nil
}
// Everything below is a copied from https://github.com/fasthttp/websocket/blob/2f8e79d2aac1e8e5a06518870e872b15608cea90/proxy.go
// as the golang.org/x/net/proxy package only supports socks5 proxies, but does allow registering additional protocols.
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
}
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
}