Add time limit for inactive sessions

closes #8

app/javascript/controllers/notification_controller.js

@@ -4,6 +4,10 @@ export default class extends Controller {
   static targets = ["buttons", "countdown"]
 
   connect() {
+    // Devise timeoutable ends up adding a second flash message without content
+    // TODO investigate bug
+    if (this.element.textContent.trim() == "true") return;
+
     const timeoutSeconds = parseInt(this.data.get("timeout"));
 
     setTimeout(() => {

app/models/user.rb

@@ -38,7 +38,8 @@ class User < ApplicationRecord
   devise :ldap_authenticatable,
          :confirmable,
          :recoverable,
-         :validatable
+         :validatable,
+         :timeoutable
 
   def ldap_before_save
     self.email = Devise::LDAP::Adapter.get_ldap_param(self.cn, "mail").first