How to get the current user in twig extension service [symfony2.8] - php

Question

I'm trying to get the current user in my NotificationExtension.php. But the page become very slow to load and I also get this error:
Error: Call to a member function getUser() on null
The error say that is impossible to get the current user, but i'm login.
This is my service:
notification:
class: Application\Sonata\UserBundle\Twig\NotificationExtension
arguments: ['#doctrine.orm.entity_manager', '#service_container', '#security.context']
tags:
- { name: twig.extension }
NotificationExtension :
<?php
namespace Application\Sonata\UserBundle\Twig;
use Doctrine\ORM\EntityManager;
use Symfony\Component\Security\Core\Authentication\Token\Storage\TokenStorage;
use Twig_Extension;
use Symfony\Component\DependencyInjection\ContainerInterface;
use Symfony\Component\Security\Core\SecurityContext;
use Symfony\Component\Security\Core\Security;
class NotificationExtension extends \Twig_Extension
{
protected $container;
protected $em;
public function __construct(EntityManager $em,ContainerInterface $container, SecurityContext $context)
{
$this->container = $container;
$this->em = $em;
$this->doctrine = $container->get('doctrine');
$this->context = $context;
}
public function getGlobals()
{
$user = $this->container->get('security.context')->getToken()->getUser();
return(array(
'unreadMessagesCount' => $this->em->getRepository('ApplicationSonataUserBundle:Notif')->findBy(
array(
'user' => $user,
'seen' => true
),
array('date' => 'DESC')
)));
}
public function getName()
{
return 'notification';
}
}
ADD:
service:
notification:
class: Application\Sonata\UserBundle\Twig\NotificationExtension
arguments: ['#doctrine.orm.entity_manager','#security.token_storage']
tags:
- { name: twig.extension }
get current user:
public function getUser()
{
return $this->tokenStorage->getToken()->getUser();
}

Answer 1

Define instead a service as a global Twig variable:
# app/config/config.yml
twig:
# ...
globals:
user_notification: '#app.user_notification'
The service class:
// src/AppBundle/Twig/Globals/UserNotification.php
class UserNotification
{
private $tokenStorage;
// ...
public function __construct(TokenStorageInterface $tokenStorage, ...)
{
$this->tokenStorage = $tokenStorage;
// ...
}
public function getUnreadMessages()
{
if (null === $token = $this->tokenStorage->getToken()) {
return array();
}
$user = $token->getUser();
// $unreadMessages = <DB query for get the unread messages from current user>
return $unreadMessages;
}
}
The service definition:
# app/config/config.yml
services:
app.user_notification:
class: AppBundle\Twig\Globals\UserNotification
arguments: ['#security.token_storage', ...]
Finally, for all templates you can to use this service:
# foo.html.twig
{{ user_notification.unreadMessages|length }}
Whenever the global variable is accessed in the template, the service will be requested from the service container and you get access to that object.
More information http://symfony.com/doc/current/templating/global_variables.html

Answer 2

you can access the username like that : app.user.username
If you want to check if the user is logged, you can use the is_granted twig function.
eg :
{% if is_granted("ROLE") %}
Hi {{ app.user.username }}
{% endif %}