Display a message if not in the current promo

auth.go

@@ -26,11 +26,16 @@ func init() {
 	router.POST("/api/auth/logout", apiRawHandler(logout))
 }
 
+type authToken struct {
+	*User
+	CurrentPromo uint `json:"current_promo"`
+}
+
 func validateAuthToken(u *User, _ httprouter.Params, _ []byte) HTTPResponse {
 	if u == nil {
 		return APIErrorResponse{status: http.StatusUnauthorized, err: fmt.Errorf("Not connected")}
 	} else {
-		return APIResponse{u}
+		return APIResponse{authToken{u, currentPromo}}
 	}
 }