How to modify post data in the request object - Symfony - PIMCORE ?

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//In service file: /var/www/html/pimcore/src/AppBundle/Resources/config/services.yml

AppBundle\EventListener\TestListener:
tags:
- { name: kernel.event_listener, event: kernel.request }


//In listner file: /var/www/html/pf/src/AppBundle/EventListener/UserListener.php
use Symfony\Component\HttpKernel\Event\GetResponseEvent;
class TestListener {

public function onKernelRequest(GetResponseEvent $event)
{
//    - { name: kernel.event_listener, event: kernel.request }

$request = $event->getRequest();

//check if the parameter 'data' is present in the request.
if(!$request->request->has('data'))
{
return;
}


$data =    $request->request->get("data");

if(empty($data['user']))
{
return;
}

//modify data here
//$data = $data;


$newData = array(
'data'=>$data
);
//replace the old data with the new modified data.
$request->request->replace($newData);
//done.
}

}