CLDC-2862: first attempt at creating maintenance page

app/controllers/application_controller.rb

@@ -3,8 +3,17 @@ class ApplicationController < ActionController::Base
 
   rescue_from Pundit::NotAuthorizedError, with: :render_not_authorized
 
+  before_action :check_maintenance
   before_action :set_paper_trail_whodunnit
 
+  def check_maintenance
+    if FeatureToggle.maintenance_mode_enabled? && request.fullpath.split("?")[0].delete("/") != "service-unavailable"
+      redirect_to service_unavailable_path
+    elsif !FeatureToggle.maintenance_mode_enabled? && request.fullpath.split("?")[0].delete("/") == "service-unavailable"
+      redirect_back(fallback_location: root_path)
+    end
+  end
+
   def render_not_found
     render "errors/not_found", status: :not_found
   end

app/controllers/maintenance_controller.rb

@@ -0,0 +1,7 @@
+class MaintenanceController < ApplicationController
+  def service_unavailable
+    if current_user
+      sign_out
+    end
+  end
+end

app/services/feature_toggle.rb

@@ -37,4 +37,8 @@ class FeatureToggle
   def self.duplicate_summary_enabled?
     !Rails.env.production?
   end
+
+  def self.maintenance_mode_enabled?
+    true
+  end
 end

app/views/layouts/application.html.erb

@@ -91,11 +91,13 @@
       navigation_classes: "govuk-header__navigation--end",
     ) do |component|
       component.product_name(name: t("service_name"))
-      if current_user.nil?
-        component.navigation_item(text: "Sign in", href: user_session_path)
-      else
-        component.navigation_item(text: "Your account", href: account_path)
-        component.navigation_item(text: "Sign out", href: destroy_user_session_path)
+      if !FeatureToggle.maintenance_mode_enabled?
+        if current_user.nil?
+          component.navigation_item(text: "Sign in", href: user_session_path)
+        else
+          component.navigation_item(text: "Your account", href: account_path)
+          component.navigation_item(text: "Sign out", href: destroy_user_session_path)
+        end
       end
     end %>
 

app/views/maintenance/service_unavailable.html.erb

@@ -0,0 +1,11 @@
+<h1 class="govuk-heading-l govuk-!-width-two-thirds">
+  Sorry, the service is unavailable
+</h1>
+
+<div class="govuk-grid-row">
+  <div class="govuk-grid-column-two-thirds-from-desktop">
+    <p class="govuk-body">You will be able to use the service later from TIME on DAY.</p>
+    <p class="govuk-body">We saved your answers.</p>
+    <p class="govuk-body"><%= govuk_link_to "Contact the helpdesk", "https://dluhcdigital.atlassian.net/servicedesk/customer/portal/6/group/11" %> if you need assistance in the meantime.</p>
+  </div>
+</div>

config/routes.rb

@@ -35,6 +35,7 @@ Rails.application.routes.draw do
   get "/accessibility-statement", to: "content#accessibility_statement"
   get "/privacy-notice", to: "content#privacy_notice"
   get "/data-sharing-agreement", to: "content#data_sharing_agreement"
+  get "/service-unavailable", to: "maintenance#service_unavailable"
 
   get "/download-23-24-lettings-form", to: "start#download_23_24_lettings_form"
   get "/download-22-23-lettings-form", to: "start#download_22_23_lettings_form"