Custom Logout and Drupal Logout

Question

we are implementing a custom login (based on an auth cookie given by a third party authentication service). When the cookie arrives, we trigger the drupal user_login. When the user logs out (via a custom box, NOT drupal logout link), we trigger the user_logout.

The problem is: if you clear the cookie auth, you remain logged on drupal. What hook can we implement to trigger the logout anytime the cookie auth disappear?

Answer 1

There is no hook for 3rd party cookie removal, and there cannot be. You need to bootstrap Drupal and call user_logout().

You could also use hook_boot() to test for the cookie and logout if it's not there, but it is a bad idea - it may seriously hurt your performance and will not play nice with external caches.