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package main
import (
"encoding/base64"
"fmt"
"io/ioutil"
"log"
"net/http"
"net/url"
"strings"
"time"
"github.com/elazarl/goproxy/ext/auth"
"github.com/elazarl/goproxy"
)
const (
ProxyAuthHeader = "Proxy-Authorization"
)
func SetBasicAuth(username, password string, req *http.Request) {
req.Header.Set(ProxyAuthHeader, fmt.Sprintf("Basic %s", basicAuth(username, password)))
}
func basicAuth(username, password string) string {
return base64.StdEncoding.EncodeToString([]byte(username + ":" + password))
}
func GetBasicAuth(req *http.Request) (username, password string, ok bool) {
auth := req.Header.Get(ProxyAuthHeader)
if auth == "" {
return
}
const prefix = "Basic "
if !strings.HasPrefix(auth, prefix) {
return
}
c, err := base64.StdEncoding.DecodeString(auth[len(prefix):])
if err != nil {
return
}
cs := string(c)
s := strings.IndexByte(cs, ':')
if s < 0 {
return
}
return cs[:s], cs[s+1:], true
}
func main() {
username, password := "foo", "bar"
// start end proxy server
endProxy := goproxy.NewProxyHttpServer()
endProxy.Verbose = true
auth.ProxyBasic(endProxy, "my_realm", func(user, pwd string) bool {
return user == username && password == pwd
})
log.Println("serving end proxy server at localhost:8082")
go http.ListenAndServe("localhost:8082", endProxy)
// start middle proxy server
middleProxy := goproxy.NewProxyHttpServer()
middleProxy.Verbose = true
middleProxy.Tr.Proxy = func(req *http.Request) (*url.URL, error) {
return url.Parse("http://localhost:8082")
}
connectReqHandler := func(req *http.Request) {
SetBasicAuth(username, password, req)
}
middleProxy.ConnectDial = middleProxy.NewConnectDialToProxyWithHandler("http://localhost:8082", connectReqHandler)
middleProxy.OnRequest().Do(goproxy.FuncReqHandler(func(req *http.Request, ctx *goproxy.ProxyCtx) (*http.Request, *http.Response) {
SetBasicAuth(username, password, req)
return req, nil
}))
log.Println("serving middle proxy server at localhost:8081")
go http.ListenAndServe("localhost:8081", middleProxy)
time.Sleep(1 * time.Second)
// fire a http request: client --> middle proxy --> end proxy --> internet
proxyUrl := "http://localhost:8081"
request, err := http.NewRequest("GET", "https://ip.cn", nil)
if err != nil {
log.Fatalf("new request failed:%v", err)
}
tr := &http.Transport{Proxy: func(req *http.Request) (*url.URL, error) { return url.Parse(proxyUrl) }}
client := &http.Client{Transport: tr}
rsp, err := client.Do(request)
if err != nil {
log.Fatalf("get rsp failed:%v", err)
}
defer rsp.Body.Close()
data, _ := ioutil.ReadAll(rsp.Body)
if rsp.StatusCode != http.StatusOK {
log.Fatalf("status %d, data %s", rsp.StatusCode, data)
}
log.Printf("rsp:%s", data)
}
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