private function getVariables(GuardEvent $event)
    {
        $token = $this->tokenStorage->getToken();

        if (null === $token) {
            throw new \Exception("No token is set")
        }

        if (null !== $this->roleHierarchy) {
            $roles = $this->roleHierarchy->getReachableRoles($token->getRoles());
        } else {
            $roles = $token->getRoles();
        }

        $variables = array(
            'token' => $token,
            'user' => $token->getUser(),
            'subject' => $event->getSubject(),
            'roles' => array_map(function ($role) {
                return $role->getRole();
            }, $roles),
            // needed for the is_granted expression function
            'auth_checker' => $this->authenticationChecker,
            // needed for the is_* expression function
            'trust_resolver' => $this->trustResolver,
        );

        return $variables;
    }