Added a Maintenance Window flash (#758)

app/assets/javascripts/cookies.js

@@ -24,4 +24,11 @@ $(document).on('turbolinks:load', function(){
     //hide the banner at the bottom
     $(".cookies-banner").attr("style","display:none !important")
   })
+
+  $("#maintenance-close").click(function(event) {
+    //create a cookie that lasts 1 year
+    var cookieDate = new Date();
+    cookieDate.setFullYear(cookieDate.getFullYear() + 1); //1 year from now
+    document.cookie = "maintenance_window=" + $(event.target).data("date") + "; path=/; expires=" + cookieDate.toUTCString() + ";"
+  })
 })

app/controllers/application_controller.rb

@@ -53,7 +53,7 @@ class ApplicationController < ActionController::Base
   end
 
   def maintenance_mode?
-    if ENV["MAINTENANCE_MODE"] == "true"
+    if Rails.configuration.maintenance_mode
       render "errors/greenlight_error", status: 503, formats: :html,
         locals: {
           status_code: 503,
@@ -61,6 +61,11 @@ class ApplicationController < ActionController::Base
           help: I18n.t("errors.maintenance.help"),
         }
     end
+    if Rails.configuration.maintenance_window.present?
+      unless cookies[:maintenance_window] == Rails.configuration.maintenance_window
+        flash.now[:maintenance] = I18n.t("maintenance.window_alert", date: Rails.configuration.maintenance_window)
+      end
+    end
   end
 
   # Sets the appropriate locale.

app/views/shared/_flash_messages.html.erb

@@ -24,6 +24,11 @@
       <button type="button" class="close" data-dismiss="alert">&times</button>
       <%= value.html_safe %>
     </div>
+  <% elsif key.eql? "maintenance" %>
+    <div class="alert alert-info alert-dismissible text-center mb-0">
+      <%= value.html_safe %>
+      <button id="maintenance-close" type="button" data-date="<%= Rails.configuration.maintenance_window %>" class="close" data-dismiss="alert">&times</button>
+    </div>
   <% elsif key.eql? "info" %>
     <div class="alert alert-info alert-dismissible text-center mb-0">
       <button type="button" class="close" data-dismiss="alert">&times</button>