API core controller with route listing

api_controller_route_listing_core.php

<?php

namespace InstantWater\AdminApiBundle\Controller;

use Symfony\Component\HttpFoundation\JsonResponse;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\Response;

use Symfony\Bundle\FrameworkBundle\Controller\Controller;
use Sensio\Bundle\FrameworkExtraBundle\Configuration\Route;
use Sensio\Bundle\FrameworkExtraBundle\Configuration\Method;
use Sensio\Bundle\FrameworkExtraBundle\Configuration\Template;

/**
 * Class AbstractApiCoreController
 * @package InstantWater\ApiBundle\Controller
 */
abstract class AbstractApiCoreController extends Controller
{

    /**
     * It will implement the empty route for each routed controller
     * @Route("", name="api-core-controller-route-list")
     * @Method("GET")
     * @param Request $request
     * @return Response
     */
    public function apiControllerRouteListAction(Request $request) {
        return new JsonResponse($this->getControllerRoutes(), 200);
    }

    /**
     * Return route names and details provided by the controller.
     * Source: http://stackoverflow.com/questions/15943780/symfony2-get-list-of-all-routes-of-a-controller/15950365#15950365
     * @return null
     */
    protected function getControllerRoutes() {

        /**
         * @var $router \Symfony\Component\Routing\Router
         * @var $collection \Symfony\Component\Routing\RouteCollection
         * @var $params \Symfony\Component\Routing\Route
         */

        $schemeAndHttpHost = $this->getRequest()->getSchemeAndHttpHost();

        $router = $this->container->get('router');

        $collection = $router->getRouteCollection();
        $allRoutes = $collection->all();

        $routes = array();

        foreach ($allRoutes as $route => $params)
        {
            $defaults = $params->getDefaults();

            if (isset($defaults['_controller']))
            {
                $controllerAction = explode(':', $defaults['_controller']);
                $controller = $controllerAction[0];

                if (!isset($routes[$controller])) {
                    $routes[$controller] = array();
                }

                $routes[$controller][$route]= array(
                    'url' => $schemeAndHttpHost.$params->getPath(),
                    'methods' => $params->getMethods(),
                    'schemes' => $params->getSchemes(),
                );
            }
        }

        return isset($routes[get_class($this)]) ?
            $routes[get_class($this)] : null ;
    }
}