Symfony: Decorating a service when user has x role - php

Question

I have been looking for an answer to this question, but I can not seem to find it anywhere.
I have currently defined a decorator service that decorates the translator service. I however want to decorate the translator service only when the user has a certain role.
services.yml
services:
app.my_translator_decorator:
class: MyBundle\MyTranslatorDecorator
decorates: translator
arguments: ['#app.my_translator_decorator.inner']
public: false
MyTranslatorDecorator.php
class MyTranslatorDecorator {
/**
* #var TranslatorInterface
*/
private $translator;
/**
* #param TranslatorInterface $translator
*/
public function __construct(TranslatorInterface $translator)
{
$this->translator = $translator;
}
// more code...
}

Answer 1

The container is "compiled" before the runtime. You can't decorate a service depending of the context, it will always be decorated.
However, in your decorator, you can add a guard clause to not execute your custom code if not necessary.
Service definition:
services:
app.my_translator_decorator:
class: AppBundle\MyTranslatorDecorator
decorates: translator
arguments: ['#app.my_translator_decorator.inner', '#security.authorization_checker']
public: false
Decorator:
<?php
namespace AppBundle;
use Symfony\Component\Security\Core\Authorization\AuthorizationCheckerInterface;
use Symfony\Component\Translation\TranslatorInterface;
class MyTranslatorDecorator implements TranslatorInterface
{
private $translator;
private $authorizationChecker;
public function __construct(TranslatorInterface $translator, AuthorizationCheckerInterface $authorizationChecker)
{
$this->translator = $translator;
$this->authorizationChecker = $authorizationChecker;
}
public function trans($id, array $parameters = [], $domain = null, $locale = null)
{
if (!$this->authorizationChecker->isGranted('ROLE_ADMIN')) {
return $this->translator->trans($id, $parameters, $domain, $locale);
}
// return custom translation here
}
// implement other methods
}