class MimeTypeMatcher

MimeTypeMatcherTest.php in drupal/core/modules/system/lib/Drupal/system/Tests/Routing/MimeTypeMatcherTest.php

Contains Drupal\system\Tests\Routing\MimeTypeMatcherTest.

core.services.yml in drupal/core/core.services.yml

drupal/core/core.services.yml

mime_type_matcher in drupal/core/core.services.yml

Drupal\Core\Routing\MimeTypeMatcher

class MimeTypeMatcher implements RouteFilterInterface {

  /**
   * Implements \Symfony\Cmf\Component\Routing\NestedMatcher\RouteFilterInterface::filter()
   */
  public function filter(RouteCollection $collection, Request $request) {

    // Generates a list of Symfony formats matching the acceptable MIME types.
    // @todo replace by proper content negotiation library.
    $acceptable_mime_types = $request
      ->getAcceptableContentTypes();
    $acceptable_formats = array_map(array(
      $request,
      'getFormat',
    ), $acceptable_mime_types);
    $filtered_collection = new RouteCollection();
    foreach ($collection as $name => $route) {

      // _format could be a |-delimited list of supported formats.
      $supported_formats = array_filter(explode('|', $route
        ->getRequirement('_format')));

      // The route partially matches if it doesn't care about format, if it
      // explicitly allows any format, or if one of its allowed formats is
      // in the request's list of acceptable formats.
      if (empty($supported_formats) || in_array('*/*', $acceptable_mime_types) || array_intersect($acceptable_formats, $supported_formats)) {
        $filtered_collection
          ->add($name, $route);
      }
    }
    if (!count($filtered_collection)) {
      throw new NotAcceptableHttpException();
    }
    return $filtered_collection;
  }

}