/**
* Try to authenticate the user with the current session
*
* Authentication for externally-authenticated users will be revoked if the username changed or external
* authentication is no longer in effect
*/
public function authenticateFromSession()
{
$this->user = Session::getSession()->get('user');
if ($this->user !== null && $this->user->isExternalUser()) {
list($originUsername, $field) = $this->user->getExternalUserInformation();
$username = ExternalBackend::getRemoteUser($field);
if ($username === null || $username !== $originUsername) {
$this->removeAuthorization();
}
}
}
