'Site under maintenance' option

I'm trying to implement a system to disable the site temporaly for maintenance purposes or whatever. If the site is disabled, only logged users can navigate through it, non-logged users are redirected to a "Site under maintenance" layout.

Currently (o "As of now"), my approach is to allow a "secret url" that will lead to the login form, check in AppController::beforefilter if the current url is the allowed one and, if it isn't, set the maintenance layout. Trying to figure out how to allow only one url to log in, I came to define it as a constant in bootstrap and add the route in config/routes pointing to UsersController::login.

It would be nice to save the secret url into the database and change it without editing bootstrap.php, though.

Any suggestion?

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