Refactor desktop notifications to be more modular.

app/assets/javascripts/discourse/components/desktop-notification-config.js.es6

@@ -1,7 +1,8 @@
 import computed from 'ember-addons/ember-computed-decorators';
 import KeyValueStore from 'discourse/lib/key-value-store';
+import { context } from 'discourse/lib/desktop-notifications';
 
-const keyValueStore = new KeyValueStore("discourse_desktop_notifications_");
+const keyValueStore = new KeyValueStore(context);
 
 export default Ember.Component.extend({
   classNames: ['controls'],

app/assets/javascripts/discourse/initializers/subscribe-user-notifications.js.es6

@@ -1,5 +1,9 @@
 // Subscribes to user events on the message bus
-import { init as initDesktopNotifications, onNotification } from 'discourse/lib/desktop-notifications';
+import {
+  init as initDesktopNotifications,
+  onNotification,
+  alertChannel
+} from 'discourse/lib/desktop-notifications';
 
 export default {
   name: 'subscribe-user-notifications',
@@ -98,10 +102,7 @@ export default {
 
       if (!Ember.testing) {
         if (!site.mobileView) {
-          bus.subscribe("/notification-alert/" + user.get('id'), function(data){
+          bus.subscribe(alertChannel(user), data => onNotification(data, user));
-            onNotification(data, user);
-          });
-
           initDesktopNotifications(bus);
         }
       }

app/assets/javascripts/discourse/lib/desktop-notifications.js.es6

@@ -159,6 +159,12 @@ function i18nKey(notification_type) {
   return "notifications.popup." + Discourse.Site.current().get("notificationLookup")[notification_type];
 }
 
-// Exported for controllers/notification.js.es6
+function alertChannel(user) {
+  return `/notification-alert/${user.get('id')}`;
+}
 
-export { init, onNotification };
+function unsubscribe(bus, user) {
+  bus.unsubscribe(alertChannel(user));
+}
+
+export { context, init, onNotification, unsubscribe, alertChannel };

app/controllers/metadata_controller.rb

@@ -3,7 +3,17 @@ class MetadataController < ApplicationController
   skip_before_filter :preload_json, :check_xhr, :redirect_to_login_if_required
 
   def manifest
-    manifest = {
+    render json: default_manifest.to_json
+  end
+
+  def opensearch
+    render file: "#{Rails.root}/app/views/metadata/opensearch.xml"
+  end
+
+  private
+
+  def default_manifest
+    {
       name: SiteSetting.title,
       short_name: SiteSetting.title,
       display: 'standalone',
@@ -19,11 +29,5 @@ class MetadataController < ApplicationController
         }
       ]
     }
-
-    render json: manifest.to_json
-  end
-
-  def opensearch
-    render file: "#{Rails.root}/app/views/metadata/opensearch.xml"
   end
 end