/**
* Try to authenticate the user
*
* @param array Submitted data
* @return Member Returns the member object on successful authentication
* or NULL on failure.
*/
public function performLogin($data)
{
if ($member = ExternalAuthenticator::authenticate($data, $this)) {
$member->LogIn(isset($data['Remember']));
return $member;
} else {
return null;
}
}