/
auth.go
98 lines (92 loc) · 2.8 KB
/
auth.go
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package main
import (
"crypto/md5"
"fmt"
"io"
"log"
"net/http"
"strings"
"github.com/stretchr/gomniauth"
"github.com/stretchr/objx"
)
type authHandler struct {
next http.Handler
}
func (h *authHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
cookie, err := r.Cookie("auth")
if err == http.ErrNoCookie || cookie.Value == "" {
// not authenticated
w.Header().Set("Location", "/login")
w.WriteHeader(http.StatusTemporaryRedirect)
return
}
if err != nil {
// some other error
http.Error(w, err.Error(), http.StatusInternalServerError)
}
// success - call the next handler
h.next.ServeHTTP(w, r)
}
// MustAuth returns a handler which wraps another handler
func MustAuth(handler http.Handler) http.Handler {
return &authHandler{next: handler}
}
// loginHandler handles the third-party login process.
// format: /auth/{action}/{provider}
func loginHandler(w http.ResponseWriter, r *http.Request) {
segs := strings.Split(r.URL.Path, "/")
action := segs[2]
provider := segs[3]
switch action {
case "login":
provider, err := gomniauth.Provider(provider)
if err != nil {
http.Error(w, fmt.Sprintf("Error when trying to get provider %s: %s", provider, err), http.StatusBadRequest)
return
}
loginURL, err := provider.GetBeginAuthURL(nil, nil)
if err != nil {
http.Error(w, fmt.Sprintf("Error when trying to GetBeginAuthURL for %s:%s", provider, err), http.StatusInternalServerError)
return
}
w.Header().Set("Location", loginURL)
w.WriteHeader(http.StatusTemporaryRedirect)
case "callback":
provider, err := gomniauth.Provider(provider)
if err != nil {
http.Error(w, fmt.Sprintf("Error when trying to get provider %s: %s", provider, err), http.StatusBadRequest)
return
}
creds, err := provider.CompleteAuth(objx.MustFromURLQuery(r.URL.RawQuery))
if err != nil {
http.Error(w, fmt.Sprintf("Error when trying to complete auth for %s: %s", provider, err), http.StatusInternalServerError)
return
}
user, err := provider.GetUser(creds)
if err != nil {
log.Fatalln("Error when trying to get user from", provider, "-", err)
}
chatUser := &chatUser{User: user}
m := md5.New()
io.WriteString(m, strings.ToLower(user.Email()))
chatUser.uniqueID = fmt.Sprintf("%x", m.Sum(nil))
avatarURL, err := avatars.GetAvatarURL(chatUser)
if err != nil {
log.Fatalln("Error when trying to GetAvatarURL", "-", err)
}
authCookieValue := objx.New(map[string]interface{}{
"userid": chatUser.uniqueID,
"name": user.Name(),
"avatar_url": avatarURL,
}).MustBase64()
http.SetCookie(w, &http.Cookie{
Name: "auth",
Value: authCookieValue,
Path: "/"})
w.Header().Set("Location", "/chat")
w.WriteHeader(http.StatusTemporaryRedirect)
default:
w.WriteHeader(http.StatusNotFound)
fmt.Fprintf(w, "Auth action %s not supported", action)
}
}