Notify user about new RS authorizations

app/mailers/notification_mailer.rb

@@ -5,4 +5,11 @@ class NotificationMailer < ApplicationMailer
     @subject = "Sats received"
     mail to: @user.email, subject: @subject
   end
+
+  def remotestorage_auth_created
+    @user = params[:user]
+    @auth = params[:auth]
+    @subject = "New app connected to your storage"
+    mail to: @user.email, subject: @subject
+  end
 end

app/models/remote_storage_authorization.rb

@@ -18,7 +18,7 @@ class RemoteStorageAuthorization < ApplicationRecord
   before_create  :store_token_in_redis
   before_create  :find_or_create_web_app
   after_create   :schedule_token_expiry
-  # after_create   :notify_user
+  after_create   :notify_user
   before_destroy :delete_token_from_redis
   after_destroy  :remove_token_expiry_job
 
@@ -93,4 +93,22 @@ class RemoteStorageAuthorization < ApplicationRecord
     rescue URI::InvalidURIError
       false
     end
+
+    def notify_user
+      notify = user.preferences[:remotestorage_notify_auth_created]
+
+      case notify
+      when "xmpp"
+        router = Router.new
+        payload = {
+          type: "normal", to: user.address,
+          from: Setting.xmpp_notifications_from_address,
+          body: "You have just granted '#{self.client_id}' access to your Kosmos Storage. Visit your Storage dashboard to check on your connected apps and revoke permissions anytime: #{router.services_storage_url}"
+        }
+        XmppSendMessageJob.perform_later(payload)
+      when "email"
+        NotificationMailer.with(user: user, auth: self)
+                          .remotestorage_auth_created.deliver_later
+      end
+    end
 end

app/services/router.rb

@@ -0,0 +1,7 @@
+class Router
+  include Rails.application.routes.url_helpers
+
+  def self.default_url_options
+    ActionMailer::Base.default_url_options
+  end
+end

app/views/notification_mailer/remotestorage_auth_created.text.erb

@@ -0,0 +1,23 @@
+Hi <%= @user.display_name.presence || @user.cn %>,
+
+You have just granted '<%= @auth.client_id %>' access to your Kosmos Storage, with the following permissions:
+
+<% @permissions.each do |p| %>
+* <%= p %>
+<% end %>
+
+Visit your Storage dashboard to check on your connected apps and revoke permissions anytime:
+
+<%= services_storage_url %>
+
+Have fun!
+
+---
+
+You can disable email notifications for new app authorizations in your account settings:
+<%= setting_path(:remotestorage) %>
+
+<% if Setting.discourse_enabled %>
+If you have any questions, please visit our community forums:
+<%= Setting.discourse_public_url %>
+<% end %>