gistfile1.php

<?php

/**
 *
 * @Service("core.event_listener.kernel")
 *
 * @Tag("kernel.event_listener", attributes = { "event" = "kernel.request", "method" = "processApi" })
 */
class Kernel
{
    // Not sure about this path, because we use something different. Check please.
    const API_CONTROLLER ='/FOS/OAuthServerBundle/Controller/TokenController.php::tokenAction';

    protected $em;

    /**
     * @InjectParams({
     *     "em"           = @Inject("doctrine.orm.entity_manager")
     * })
     */
    public function __construct($em)
    {
        $this->em = $em;
    }



    public function processApi(GetResponseEvent $event)
    {
        $request = $event->getRequest();
        $controller = $event->getRequest()->attributes->get('_controller');

        if ($controller !== self::API_CONTROLLER) {
            return;
        }

        $clients = $this->em->getRepository('DataBundle:Client')->findAll();

        if (!$clients || !isset($clients[0])) {
            throw new HttpException('API clients are empty. Please, configure them.');
        }

        if (count($clients) != 1) {
            throw new HttpException('There are more than one API client. Please, configure it correctly.');
        }

        /**
         * @var Client $client
         */
        $client = reset($clients);
        // Setup client id and secret id
        if ($request->getMethod() === 'POST') {
            $request->request->set('client_id', $client->getPublicId());
            $request->request->set('client_secret', $client->getSecret());
            return;
        }

        $request->query->set('client_id', $client->getPublicId());
        $request->query->set('client_secret', $client->getSecret());
    }
}