Event listener to force FOS user to change password

HpatoioForcepassupdateListener.php

<?php

namespace Hpatoio\UserBundle\EventListener;

use Symfony\Component\HttpFoundation\RedirectResponse;
use Symfony\Component\HttpKernel\Event\GetResponseEvent;

use Symfony\Component\Security\Core\SecurityContext;
use Symfony\Bundle\FrameworkBundle\Routing\Router;
use Symfony\Component\HttpFoundation\Session\Session;

/**
 * @Service("request.set_messages_count_listener")
 *
 */
class HpatoioForcepassupdateListener
{
    
    private $security_context;
    private $router;
    private $session;

    public function __construct(Router $router, SecurityContext $security_context, Session $session)
    {
        $this->security_context = $security_context;
        $this->router 		= $router;
        $this->session 		= $session;
        
    }
    
    public function onCheckExpired(GetResponseEvent $event)
    {

        if ( ($this->security_context->getToken() ) && ( $this->security_context->isGranted('IS_AUTHENTICATED_FULLY') ) ) {
            
            $route_name = $event->getRequest()->get('_route');
            
            if ($route_name != 'fos_user_change_password') {

                $pass_validity_days     = 90;
                
                $today                  = new \DateTime();
                $days_since_last_change = $this->security_context->getToken()->getUser()->getPasswordChangedAt()->diff($today);

                if ($days_since_last_change->format('%a') >  $pass_validity_days ) {

                    $response = new RedirectResponse($this->router->generate('fos_user_change_password'));
                    $this->session->setFlash('error', "Your password hash expired. Please change it");
                    $event->setResponse($response);                

                }
                
            }
            
        }

    }
    
}