6d9e4a9330
The user can access this page without being logged in. We identify the user through the "subscriptions_token" parameter and show a list of the notifications that can be enable/disable. We will return a 404 error in case someone accesses the page with a non-existent token. We also control the case that some anonymous user tries to access the page without any token, by returning the CanCan::AccessDenied exception.