Chris@0: <?php
Chris@0: 
Chris@0: namespace Drupal\Core\StackMiddleware;
Chris@0: 
Chris@0: use Symfony\Component\HttpFoundation\Request;
Chris@0: use Symfony\Component\HttpKernel\HttpKernelInterface;
Chris@0: 
Chris@0: /**
Chris@0:  * Provides a middleware to determine the content type upon the accept header.
Chris@0:  *
Chris@0:  * @todo This is a temporary solution, remove this in https://www.drupal.org/node/2364011
Chris@0:  */
Chris@0: class NegotiationMiddleware implements HttpKernelInterface {
Chris@0: 
Chris@0:   /**
Chris@0:    * The wrapped HTTP kernel.
Chris@0:    *
Chris@0:    * @var \Symfony\Component\HttpKernel\HttpKernelInterface
Chris@0:    */
Chris@0:   protected $app;
Chris@0: 
Chris@0:   /**
Chris@0:    * Contains a hashmap of format as key and mimetype as value.
Chris@0:    *
Chris@0:    * @var array
Chris@0:    */
Chris@0:   protected $formats = [];
Chris@0: 
Chris@0:   /**
Chris@0:    * Constructs a new NegotiationMiddleware.
Chris@0:    *
Chris@0:    * @param \Symfony\Component\HttpKernel\HttpKernelInterface $app
Chris@0:    *   The wrapper HTTP kernel
Chris@0:    */
Chris@0:   public function __construct(HttpKernelInterface $app) {
Chris@0:     $this->app = $app;
Chris@0:   }
Chris@0: 
Chris@0:   /**
Chris@0:    * {@inheritdoc}
Chris@0:    */
Chris@0:   public function handle(Request $request, $type = self::MASTER_REQUEST, $catch = TRUE) {
Chris@0:     // Register available mime types.
Chris@0:     foreach ($this->formats as $format => $mime_type) {
Chris@0:       $request->setFormat($format, $mime_type);
Chris@0:     }
Chris@0: 
Chris@0:     // Determine the request format using the negotiator.
Chris@16:     if ($requested_format = $this->getContentType($request)) {
Chris@16:       $request->setRequestFormat($requested_format);
Chris@16:     }
Chris@0:     return $this->app->handle($request, $type, $catch);
Chris@0:   }
Chris@0: 
Chris@0:   /**
Chris@0:    * Registers a format for a given MIME type.
Chris@0:    *
Chris@0:    * @param string $format
Chris@0:    *   The format.
Chris@0:    * @param string $mime_type
Chris@0:    *   The MIME type.
Chris@0:    *
Chris@0:    * @return $this
Chris@0:    */
Chris@0:   public function registerFormat($format, $mime_type) {
Chris@0:     $this->formats[$format] = $mime_type;
Chris@0:     return $this;
Chris@0:   }
Chris@0: 
Chris@0:   /**
Chris@0:    * Gets the normalized type of a request.
Chris@0:    *
Chris@0:    * The normalized type is a short, lowercase version of the format, such as
Chris@0:    * 'html', 'json' or 'atom'.
Chris@0:    *
Chris@0:    * @param \Symfony\Component\HttpFoundation\Request $request
Chris@0:    *   The request object from which to extract the content type.
Chris@0:    *
Chris@0:    * @return string
Chris@0:    *   The normalized type of a given request.
Chris@0:    */
Chris@0:   protected function getContentType(Request $request) {
Chris@0:     // AJAX iframe uploads need special handling, because they contain a JSON
Chris@0:     // response wrapped in <textarea>.
Chris@0:     if ($request->request->get('ajax_iframe_upload', FALSE)) {
Chris@0:       return 'iframeupload';
Chris@0:     }
Chris@0: 
Chris@0:     if ($request->query->has('_format')) {
Chris@0:       return $request->query->get('_format');
Chris@0:     }
Chris@0: 
Chris@16:     // No format was specified in the request.
Chris@16:     return NULL;
Chris@0:   }
Chris@0: 
Chris@0: }