public void PerformUserSecurityOperations(User user)
        {
            // authenticate user
            _authenticator.AuthenticateUser(user.UserName, user.Password);

            // authorize user
            bool canUserBeAuthorized = _authorizer.CanAuthorizeUser(user.UserName);

            if (canUserBeAuthorized)
            {
                _authorizer.AuthorizeUser(user.UserName);
            }
        }