Api Exception Listener

ApiExceptionListener.php

<?php

namespace TSS\CoreBundle\EventListener;

use Psr\Log\LoggerInterface;
use Symfony\Component\HttpFoundation\JsonResponse;
use Symfony\Component\HttpKernel\Event\GetResponseForExceptionEvent;
use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\HttpKernel\Exception\HttpExceptionInterface;

class ApiExceptionListener
{
    protected $logger;
    protected $kernel;

    public function __construct(LoggerInterface $logger = null, $kernel)
    {
        $this->logger = $logger;
        $this->kernel = $kernel;
    }

    public function onKernelException(GetResponseForExceptionEvent $event)
    {
        if (strpos($event->getRequest()->getRequestUri(), '/api') === 0) {

            $this->logException($event->getException(), sprintf('Uncaught API PHP Exception %s: "%s" at %s line %s', get_class($event->getException()), $event->getException()->getMessage(), $event->getException()->getFile(), $event->getException()->getLine()));

            $code = $event->getException() instanceof HttpExceptionInterface
                ? $event->getException()->getStatusCode()
                : Response::HTTP_INTERNAL_SERVER_ERROR;

            $data = [
                'code' => $code,
                'message' => $this->kernel->isDebug() ? $event->getException()->getMessage() : 'Invalid request',
            ];

            $response = new JsonResponse($data, $code);
            $response->headers->set('X-Exception-Message', $event->getException()->getMessage());

            $event->setResponse($response);
        }
    }

    /**
     * Logs an exception.
     *
     * @param \Exception $exception The \Exception instance
     * @param string     $message   The error message to log
     */
    protected function logException(\Exception $exception, $message)
    {
        if (null !== $this->logger) {
            if (!$exception instanceof HttpExceptionInterface || $exception->getStatusCode() >= 500) {
                $this->logger->critical($message, array('exception' => $exception));
            } else {
                $this->logger->error($message, array('exception' => $exception));
            }
        }
    }
}