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<?php |
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namespace Alchemy\RestBundle\EventListener; |
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use Alchemy\Rest\Request\PaginationOptions; |
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use Alchemy\Rest\Response\ArrayTransformer; |
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use League\Fractal\Pagination\PagerfantaPaginatorAdapter; |
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use Pagerfanta\Pagerfanta; |
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use Symfony\Component\EventDispatcher\EventSubscriberInterface; |
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use Symfony\Component\HttpFoundation\Response; |
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use Symfony\Component\HttpKernel\Event\GetResponseForControllerResultEvent; |
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use Symfony\Component\HttpKernel\KernelEvents; |
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use Symfony\Component\Routing\Generator\UrlGeneratorInterface; |
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class TransformResponseListener implements EventSubscriberInterface |
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{ |
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/** |
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* @var UrlGeneratorInterface |
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*/ |
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private $urlGenerator; |
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/** |
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* @var ArrayTransformer |
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*/ |
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private $transformer; |
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/** |
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* @param ArrayTransformer $transformer |
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* @param UrlGeneratorInterface $urlGenerator |
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*/ |
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public function __construct(ArrayTransformer $transformer, UrlGeneratorInterface $urlGenerator) |
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{ |
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$this->transformer = $transformer; |
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$this->urlGenerator = $urlGenerator; |
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} |
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public function onKernelView(GetResponseForControllerResultEvent $event) |
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{ |
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$request = $event->getRequest(); |
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if (!$request->attributes->has('_rest') || $event->getControllerResult() instanceof Response) { |
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return; |
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} |
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$config = $this->normalizeConfig($request->attributes->get('_rest', array(), true)); |
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$includes = $request->query->get('include', null); |
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$data = $event->getControllerResult(); |
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$transformedData = $this->transformResult($config, $data, $includes, $request); |
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$event->setControllerResult($transformedData); |
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} |
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protected function normalizeConfig(array $config) |
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{ |
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if (!isset($config['transform']) || trim($config['transform'] == '')) { |
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throw new \RuntimeException('Transformer key is not set.'); |
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} |
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$config['list'] = (bool)(isset($config['list']) ? $config['list'] : false); |
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return $config; |
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} |
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/** |
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* @param $data |
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* @param $request |
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* @return null|PagerfantaPaginatorAdapter |
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*/ |
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protected function buildPaginatorAdapter($data, $request) |
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{ |
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if (!$data instanceof Pagerfanta) { |
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return null; |
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} |
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$pagination = $request->attributes->get('pagination'); |
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if (!$pagination instanceof PaginationOptions) { |
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return null; |
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} |
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$limit = $pagination->getLimit(); |
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$routeGenerator = function ($page) use ($request, $limit) { |
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// Calculation is necessary since requested page is not |
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$params = array_merge($request->query->all(), $request->attributes->get('_route_params', array()), array( |
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'limit' => $limit, |
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'offset' => max($page - 1, 0) * max($limit, 0) |
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)); |
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return $this->urlGenerator->generate( |
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$request->attributes->get('_route'), |
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$params, |
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UrlGeneratorInterface::ABSOLUTE_PATH |
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); |
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}; |
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return new PagerfantaPaginatorAdapter($data, $routeGenerator); |
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} |
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/** |
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* @param $config |
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* @param $data |
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* @param $includes |
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* @param $request |
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* @return array |
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*/ |
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private function transformResult($config, $data, $includes, $request) |
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{ |
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if ($config['list']) { |
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return $this->transformer->transformList( |
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$config['transform'], |
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$data, |
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$includes, |
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$this->buildPaginatorAdapter($data, $request) |
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); |
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} |
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return $this->transformer->transform( |
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$config['transform'], |
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$data, |
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$includes |
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); |
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} |
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public static function getSubscribedEvents() |
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{ |
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return array(KernelEvents::VIEW => 'onKernelView'); |
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} |
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} |
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alchemy-fr /
rest-bundle
