bundles/sanity-bundle/EventListener/ResponseListener.php line 40

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  1. <?php
  3. namespace GC\SanityBundle\EventListener;
  5. use GC\SanityBundle\ESIAdapter;
  6. use GC\SanityBundle\ControllerResult;
  7. use GC\SanityBundle\Configuration\ExplicitHTTPCacheLayer;
  9. use Symfony\Component\EventDispatcher\EventSubscriberInterface;
  10. use Symfony\Component\HttpKernel\KernelEvents;
  11. use Symfony\Component\HttpKernel\Event\ViewEvent;
  12. use Symfony\Component\HttpKernel\Event\ResponseEvent;
  13. use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;
  14. use Symfony\Component\HttpFoundation\Response;
  16. class ResponseListener implements EventSubscriberInterface
  17. {
  18.     protected $esi;
  19.     
  20.     protected $httpCacheLayer;
  21.     
  22.     protected $lastModified;
  24.     public function __construct( ESIAdapter $esi )
  25.     {
  26.         $this->esi = $esi;
  27.     }
  29.     public static function getSubscribedEvents()
  30.     {
  31.         return array(
  32.             KernelEvents::VIEW => array('onKernelView', 128),
  33.             KernelEvents::RESPONSE => array('onKernelResponse'),
  34.         );
  35.     }
  37.     /**
  38.      * @param GetResponseForControllerResultEvent $event A GetResponseForControllerResultEvent instance
  39.      */
  40.     public function onKernelView(ViewEvent $event)
  41.     {
  42.         $request = $event->getRequest();
  43.         $controllerResult = $event->getControllerResult();
  44.         
  45.         $this->httpCacheLayer = $request->attributes->get('_http_cache_layer');
  46.                 
  47.         if($controllerResult instanceOf ControllerResult){    
  48.         
  49.             $this->lastModified = $controllerResult->getLatestDateTime();
  50.             
  51.             if( !$this->httpCacheLayer )
  52.                 $this->httpCacheLayer = new ExplicitHTTPCacheLayer([]);
  53.                 
  54.             if( !$controllerResult->hasResult() ){
  55.             
  56.                 if( $controllerResult->throwOnNoResult() ) 
  57.                     throw new NotFoundHttpException;
  58.                     
  59.                 if( $controllerResult->emptyResponseOnNoResult() )
  60.                     $event->setResponse( new Response );
  61.                     
  62.                 return;
  63.             }
  64.             
  65.         } else if ($this->httpCacheLayer) { // just a twig template, use git date or default
  66.         
  67.             $this->lastModified = $this->esi->getBaseLastModified();
  68.         
  69.         }
  70.         
  71.         if( $this->lastModified ) {
  72.             
  73.             if( $this->esi->getProductionMode() ){
  74.                 
  75.                 $response = new Response;
  76.                 $response->setLastModified( $this->lastModified );
  77.                 
  78.                 if ($response->isNotModified( $request )){
  79.                     $event->setResponse( $response );
  80.                     return;
  81.                 }    
  82.             } 
  83.             
  84.             if($controllerResult instanceOf ControllerResult){ // fetch and hydrate the objects
  85.     
  86.                 $result = $controllerResult->getResult();
  87.                 
  88.                 $event->setControllerResult($result + [
  89.                     '_controller_result' => [
  90.                         'name' => $controllerResult->getName(),
  91.                         'last_modified' => $this->lastModified,
  92.                         'result' => $result
  93.                     ]
  94.                 ]);    
  95.             }
  96.         }        
  97.     }
  98.      
  99.     /**
  100.      * @param FilterResponseEvent $event A FilterResponseEvent instance
  101.      */
  102.     public function onKernelResponse(ResponseEvent $event)
  103.     {
  104.         if($this->lastModified && $this->httpCacheLayer){
  105.             
  106.             $response = $event->getResponse();
  107.             $response->setLastModified( $this->lastModified );
  108.             $response->headers->set('x-esi-last-modified', $this->lastModified->format('r'));
  109.             
  110.             if( $this->esi->getProductionMode() ){
  111.                 
  112.                 $maxAge = $this->httpCacheLayer->getMaxAge();
  113.                 
  114.                 if(!is_null($maxAge))
  115.                     $response->setMaxAge( $maxAge );
  116.                 
  117.                 $response->setSharedMaxAge( $this->httpCacheLayer->getSharedMaxAge() );
  118.             }
  119.         }
  120.     }
  121. }