How to get Request object inside a Twig Extension in Symfony? - symfony

Question

How can one access the Request object inside Twig Extension?
namespace Acme\Bundle\Twig;
use Twig_SimpleFunction;
class MyClass extends \Twig_Extension
{
public function getFunctions()
{
return array(
new Twig_SimpleFunction('xyz', function($param) {
/// here
$request = $this->getRequestObject();
})
);
}
public function getName() {
return "xyz";
}
}

Answer 1

As requested in the comments, here's the prefered way of injecting a request into any service. It works with Symfony >= 2.4.
Injecting the request and putting our service in the request scope is no longer recommended. We should use the request stack instead.
namespace AppBundle\Twig;
use Symfony\Component\HttpFoundation\RequestStack;
class MyClass extends \Twig_Extension
{
private $requestStack;
public function __construct(RequestStack $requestStack)
{
$this->requestStack = $requestStack;
}
public function getFunctions()
{
$requestStack = $this->requestStack;
return array(
new \Twig_SimpleFunction('xyz', function($param) use ($requestStack) {
$request = $requestStack->getCurrentRequest();
})
);
}
public function getName()
{
return "xyz";
}
}
app/config/services.yml
app.twig_extension:
class: AppBundle\Twig\MyExtension
arguments:
- '#request_stack'
tags:
- { name: twig.extension }
Docs:
the request stack API
the request stack announcement

Answer 2

Register your extension as a service and give it the container service:
# services.yml
services:
sybio.twig_extension:
class: %sybio.twig_extension.class%
arguments:
- #service_container
tags:
- { name: twig.extension, priority: 255 }
Then retrieve the container by your (twig extension) class constructor and then the request:
<?php
// Your class file:
// ...
class MyClass extends \Twig_Extension
{
/**
* #var ContainerInterface
*/
protected $container;
/**
* #var Request
*/
protected $request;
/**
* Constructor
*
* #param ContainerInterface $container
*/
public function __construct($container)
{
$this->container = $container;
if ($this->container->isScopeActive('request')) {
$this->request = $this->container->get('request');
}
}
// ...
Note that testing the scope is usefull because there is no request when running console command, it avoids warnings.
That's it, you are able to use the request !

Answer 3

I would suggest setting 'needs_environment' => true for your Twig_SimpleFunction, which then will add \Twig_Environment as first argument of your function. Then in your function you can find the request like this:
$request = $twig->getGlobals()['app']->getRequest();
So the whole function will look like this:
...
public function getFunctions() {
return [
new \Twig_SimpleFunction('xyz', function(\Twig_Environment $env) {
$request = $twig->getGlobals()['app']->getRequest();
}, [
'needs_environment' => true,
]),
];
}
...