How to get logged in user in Symfony?

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use SymfonyComponentSecurityCoreSecurity;

class SomeController extends AbstractController
{
    public function someAction(Security $security)
    {
        $user = $security->getUser();

        // do something with the user object
    }
}

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use SymfonyComponentSecurityCoreSecurity;

class SomeService
{
    private $security;

    public function __construct(Security $security)
    {
        $this->security = $security;
    }

    public function someMethod()
    {
        $user = $this->security->getUser();

        // do something with the user object
    }
}

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{% if app.user %}
    Hello {{ app.user.username }}!
{% endif %}