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package auth
import (
"bytes"
"encoding/base64"
"io/ioutil"
"net/http"
"strings"
"github.com/elazarl/goproxy"
)
var unauthorizedMsg = []byte("407 Proxy Authentication Required")
func BasicUnauthorized(req *http.Request, realm string) *http.Response {
// TODO(elazar): verify realm is well formed
return &http.Response{
StatusCode: 407,
ProtoMajor: 1,
ProtoMinor: 1,
Request: req,
Header: http.Header{"Proxy-Authenticate": []string{"Basic realm=" + realm}},
Body: ioutil.NopCloser(bytes.NewBuffer(unauthorizedMsg)),
ContentLength: int64(len(unauthorizedMsg)),
}
}
var proxyAuthorizatonHeader = "Proxy-Authorization"
func auth(req *http.Request, f func(user, passwd string) bool) bool {
authheader := strings.SplitN(req.Header.Get(proxyAuthorizatonHeader), " ", 2)
req.Header.Del(proxyAuthorizatonHeader)
if len(authheader) != 2 || authheader[0] != "Basic" {
return false
}
userpassraw, err := base64.StdEncoding.DecodeString(authheader[1])
if err != nil {
return false
}
userpass := strings.SplitN(string(userpassraw), ":", 2)
if len(userpass) != 2 {
return false
}
return f(userpass[0], userpass[1])
}
// Basic returns a basic HTTP authentication handler for requests
//
// You probably want to use auth.ProxyBasic(proxy) to enable authentication for all proxy activities
func Basic(realm string, f func(user, passwd string) bool) goproxy.ReqHandler {
return goproxy.FuncReqHandler(func(req *http.Request, ctx *goproxy.ProxyCtx) (*http.Request, *http.Response) {
if !auth(req, f) {
return nil, BasicUnauthorized(req, realm)
}
return req, nil
})
}
// BasicConnect returns a basic HTTP authentication handler for CONNECT requests
//
// You probably want to use auth.ProxyBasic(proxy) to enable authentication for all proxy activities
func BasicConnect(realm string, f func(user, passwd string) bool) goproxy.HttpsHandler {
return goproxy.FuncHttpsHandler(func(host string, ctx *goproxy.ProxyCtx) (*goproxy.ConnectAction, string) {
if !auth(ctx.Req, f) {
ctx.Resp = BasicUnauthorized(ctx.Req, realm)
return goproxy.RejectConnect, host
}
return goproxy.OkConnect, host
})
}
// ProxyBasic will force HTTP authentication before any request to the proxy is processed
func ProxyBasic(proxy *goproxy.ProxyHttpServer, realm string, f func(user, passwd string) bool) {
proxy.OnRequest().Do(Basic(realm, f))
proxy.OnRequest().HandleConnect(BasicConnect(realm, f))
}
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