/
auth.go
122 lines (112 loc) · 3.11 KB
/
auth.go
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package main
import (
"crypto/md5"
"fmt"
"io"
"log"
"net/http"
"strings"
"github.com/stretchr/gomniauth"
gomniauthcommon "github.com/stretchr/gomniauth/common"
"github.com/stretchr/objx"
)
// google auth: studied-jigsaw-107112
// google client id:
const (
googleClientSecret = "8_T2vBoySznvzgwyytpiILcQ"
googleClientID = "1055957612966-9khlkrdvflvq0eb0sdgcjio8ccce5krj.apps.googleusercontent.com"
)
//ChatUser ...
type ChatUser interface {
UniqueID() string
AvatarURL() string
}
type chatUser struct {
gomniauthcommon.User
uniqueID string
}
func (u chatUser) UniqueID() string {
return u.uniqueID
}
type authHandler struct {
next http.Handler
}
func (h *authHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
if cookie, err := r.Cookie("auth"); err == http.ErrNoCookie || cookie.Value == "" {
//not authenticated
w.Header().Set("Location", "/login")
w.WriteHeader(http.StatusTemporaryRedirect)
return
} else if err != nil {
//some other Error
panic(err.Error())
} else {
//success
h.next.ServeHTTP(w, r)
}
}
//MustAuth handler for auth
func MustAuth(handler http.Handler) http.Handler {
return &authHandler{next: handler}
}
//loginHandler handle the third party login process
//format: /auth/{action}/{provider}
func loginHandler(w http.ResponseWriter, r *http.Request) {
segs := strings.Split(r.URL.Path, "/")
if len(segs) != 4 {
w.WriteHeader(http.StatusBadRequest)
fmt.Fprintf(w, "Invalid URL path %s", r.URL.Path)
return
}
action := segs[2]
provider := segs[3]
switch action {
case "login":
provider, err := gomniauth.Provider(provider)
if err != nil {
log.Fatalln("Error when trying to get provider", provider, "-", err)
}
loginURL, err := provider.GetBeginAuthURL(nil, nil)
if err != nil {
log.Fatalln("Error when trying to GetBeginAuthURL for", provider, "-", err)
}
w.Header().Set("Location", loginURL)
w.WriteHeader(http.StatusTemporaryRedirect)
case "callback":
provider, err := gomniauth.Provider(provider)
if err != nil {
log.Fatalln("Error when trying to get provider", provider, "-", err)
}
creds, err := provider.CompleteAuth(objx.MustFromURLQuery(r.URL.RawQuery))
if err != nil {
log.Fatalln("Error when trying to complete auth for", provider, "-", err)
}
user, err := provider.GetUser(creds)
if err != nil {
log.Fatalln("Error when trying to get user creds for", provider, "-", err)
}
chatUser := &chatUser{User: user}
m := md5.New()
io.WriteString(m, strings.ToLower(user.Email()))
userid := fmt.Sprintf("%x", m.Sum(nil))
chatUser.uniqueID = userid
avatarURL, err := avatars.GetAvatarURL(chatUser)
if err != nil {
log.Fatalln("Error when trying to getAvatarURL", "-", err)
}
authCookieValue := objx.New(map[string]interface{}{
"userID": userid,
"name": user.Name(),
"avatar_url": avatarURL,
}).MustBase64()
http.SetCookie(w, &http.Cookie{
Name: "auth",
Value: authCookieValue,
Path: "/"})
w.Header()["Location"] = []string{"/chat"}
w.WriteHeader(http.StatusTemporaryRedirect)
default:
w.WriteHeader(http.StatusNotFound)
fmt.Fprintf(w, "Auth action %s not supported", action)
}
}