I'm really struggling to understand this and now I'm just going round in circles.
I've read as much of the manual as possible, paid for a video tutorial, scoured Google and YouTube and just can't get this working.
I am simply trying to set up a listener that activates before every request. I can do this, but my problem is getting access to the various other parts I need.
Below is an example but I think only actual code will help me understand this now.
I would appreciate if anyone could fill in the blanks. It's just an example, but each part will explain to me what it is I need to know.
In config.yml:
services:
kernel.listener.request_listener:
class: Acme\Bundle\NewBundle\EventListener\RequestListener
tags:
- { name: kernel.event_listener, event: kernel.request, method: onKernelRequest }
arguments: [ '@service_container' ]
The class:
namespace Acme\Bundle\NewBundle\EventListener;
use Symfony\Component\HttpKernel\Event\GetResponseEvent;
***do I need to 'use' any others here?***
class RequestListener
{
public function onKernelRequest($container) {
//reference to these: http://api.symfony.com/2.1/Symfony/Component/HttpKernel/Event/KernelEvent.html
$kernel =
//reference to the Request object
$request = $kernel->getRequest();
//reference to the Response object
$response =
//options:
// (1) continue to run usual content
// (2) stop execution and output a message
// (3) set cookie and continue to run usual content
switch( $request->query->get('option') ) {
case 1:
return
case 2:
$this->setResponse("hello, message here");
break;
case 3:
// *** not sure if this is the way to do it ***
$response->headers->setCookie(new Cookie("test", 1));
break;
}
}
}
There are few mistakes in your services.yml
In order to make your code work, this should look like
services.yml
services:
listener.requestresponse:
class: My\AwesomeBundle\Listener\MyListener
arguments: ['@service_container']
tags:
- { name: kernel.event_listener, event: kernel.request, method: onKernelRequest }
- { name: kernel.event_listener, event: kernel.response, method: onKernelResponse }
My\AwesomeBundle\Listener\MyListener.php
namespace My\AwesomeBundle\Listener;
use Symfony\Component\HttpKernel\Event\GetResponseEvent;
use Symfony\Component\HttpKernel\Event\FilterResponseEvent;
use Symfony\Component\HttpFoundation\Cookie;
use Symfony\Component\DependencyInjection\ContainerInterface;
class MyListener
{
protected $container;
public function __construct(ContainerInterface $container) // this is @service_container
{
$this->container = $container;
}
public function onKernelRequest(GetResponseEvent $event)
{
$kernel = $event->getKernel();
$request = $event->getRequest();
$container = $this->container;
}
public function onKernelResponse(FilterResponseEvent $event)
{
$response = $event->getResponse();
$request = $event->getRequest();
$kernel = $event->getKernel();
$container = $this->container;
switch ($request->query->get('option')) {
case 2:
$response->setContent('Blah');
break;
case 3:
$response->headers->setCookie(new Cookie('test', 1));
break;
}
}
}
It seems that you don't actually understand how symfony2 dic works.
Your kernel.request
listener can handle only cases 1 and 2. For case 3 you should use kernel.response
event.
services:
listener.requestresponse:
class: Acme\Bundle\NewBundle\EventListener\RequestListener
tags:
- { name: kernel.event_listener, event: kernel.request, method: onKernelRequest }
- { name: kernel.event_listener, event: kernel.response, method: onKernelResponse }
The class:
use Symfony\Component\HttpKernel\Event\GetResponseEvent;
use Symfony\Component\HttpKernel\Event\FilterResponseEvent;
use Symfony\Component\HttpFoundation\Response;
class MyListener
{
public function onKernelRequest(GetResponseEvent $event)
{
$request = $event->getRequest();
if ($request->query->get('option') == 2) {
$event->setResponse(new Response("hello, message here"));
}
}
public function onKernelResponse(FilterResponseEvent $event)
{
$response = $event->getResponse();
$request = $event->getRequest();
if ($request->query->get('option') == 3) {
$response->headers->setCookie(new Cookie("test", 1));
}
}
}
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