implemented logout handler

auth/auth.go

@@ -68,8 +68,19 @@ func Login(w http.ResponseWriter, r *http.Request) {
 	}
 }
 
+func Logout(w http.ResponseWriter, r *http.Request) {
+	_, s := getSessionFromCookie(r)
+	invalidateSessionCookie(w)
+	if s == nil {
+		http.Error(w, "Request does not contain a valid session cookie or session is already expired.", http.StatusUnauthorized)
+		return
+	}
+	http.Error(w, "You are now logged out.", http.StatusOK)
+}
+
 func InstallHTTPHandler(r *mux.Router) {
 	r.HandleFunc("/login", Login)
+	r.HandleFunc("/logout", Logout)
 	if auth.oidc != nil {
 		r.Handle("/oidc/callback", auth.oidc.CallbackHandler())
 	}