/**
  * This action applies a given filter to a given image, saves the image and
  * outputs it to the browser at the same time
  *
  * @param string $path
  * @param string $filter
  *
  * @return Response
  *
  * @throws Exception
  */
 public function filterAction($path, $filter)
 {
     $baseUrl = $this->request->getBaseUrl();
     try {
         try {
             $cachedPath = $this->cacheManager->cacheImage($baseUrl, $path, $filter);
         } catch (RuntimeException $e) {
             if (!isset($this->notFoundImages[$filter])) {
                 throw $e;
             }
             $path = $this->notFoundImages[$filter];
             $cachedPath = $this->cacheManager->cacheImage($baseUrl, $path, $filter);
         }
     } catch (RouteNotFoundException $e) {
         throw new NotFoundHttpException('Filter doesn\'t exist.');
     }
     // if cache path cannot be determined, return 404
     if (null === $cachedPath) {
         throw new NotFoundHttpException('Image doesn\'t exist');
     }
     try {
         // Using File instead of Imagine::open(), because i.e. image/x-icon is not widely supported.
         $file = new ImageFile($cachedPath, false);
         // TODO: add more media headers
         $headers = ['content-type' => $file->getMimeType(), 'content-length' => $file->getSize()];
         $response = new Response($file->getContents(), 201, $headers);
         // Cache
         if (!($cacheType = $this->filterManager->getOption($filter, 'cache_type', false))) {
             return $response;
         }
         $cacheType === 'public' ? $response->setPublic() : $response->setPrivate();
         $cacheExpires = $this->filterManager->getOption($filter, 'cache_expires', '1 day');
         $expirationDate = new DateTime('+' . $cacheExpires);
         $maxAge = $expirationDate->format('U') - time();
         if ($maxAge < 0) {
             throw new InvalidArgumentException('Invalid cache expiration date');
         }
         $response->setExpires($expirationDate);
         $response->setMaxAge($maxAge);
         return $response;
     } catch (Exception $e) {
         throw $e;
     }
 }
 /**
  * This action applies a given filter to a given image, saves the image and
  * outputs it to the browser at the same time
  *
  * @param string $path
  * @param string $filter
  *
  * @return Response
  */
 public function filter($path, $filter)
 {
     $cachedPath = $this->cacheManager->cacheImage($this->request->getBaseUrl(), $path, $filter);
     // if cache path cannot be determined, return 404
     if (null === $cachedPath) {
         throw new NotFoundHttpException('Image doesn\'t exist');
     }
     ob_start();
     try {
         $format = $this->filterManager->getOption($filter, "format", "png");
         $this->imagine->open($cachedPath)->show($format);
         $type = 'image/' . $format;
         $length = ob_get_length();
         $content = ob_get_clean();
         // TODO: add more media headers
         $response = new Response($content, 201, array('content-type' => $type, 'content-length' => $length));
         // Cache
         $cacheType = $this->filterManager->getOption($filter, "cache_type", false);
         if (false == $cacheType) {
             return $response;
         }
         $cacheType === "public" ? $response->setPublic() : $response->setPrivate();
         $cacheExpires = $this->filterManager->getOption($filter, "cache_expires", "1 day");
         $expirationDate = new \DateTime("+" . $cacheExpires);
         $maxAge = $expirationDate->format("U") - time();
         if ($maxAge < 0) {
             throw new \InvalidArgumentException("Invalid cache expiration date");
         }
         $response->setExpires($expirationDate);
         $response->setMaxAge($maxAge);
         return $response;
     } catch (\Exception $e) {
         ob_end_clean();
         throw $e;
     }
 }