function ContentTypeHeaderMatcher::filter

Overrides FilterInterface::filter

File

core/lib/Drupal/Core/Routing/ContentTypeHeaderMatcher.php, line 17

Class

ContentTypeHeaderMatcher

Filters routes based on the HTTP Content-type header.

Namespace

Code

public function filter(RouteCollection $collection, Request $request) {
    // The Content-type header does not make sense on GET or DELETE requests,
    // because they do not carry any content. Nothing to filter in this case.
    // Same for all other safe methods.
    if ($request->isMethodSafe() || $request->isMethod('DELETE')) {
        return $collection;
    }
    $format = $request->getContentTypeFormat();
    foreach ($collection as $name => $route) {
        $supported_formats = array_filter(explode('|', $route->getRequirement('_content_type_format') ?? ''));
        if (empty($supported_formats)) {
            // No restriction on the route, so we move the route to the end of the
            // collection by re-adding it. That way generic routes sink down in the
            // list and exact matching routes stay on top.
            $collection->add($name, $route);
        }
        elseif (!in_array($format, $supported_formats)) {
            $collection->remove($name);
        }
    }
    if (count($collection)) {
        return $collection;
    }
    // We do not throw a
    // \Symfony\Component\Routing\Exception\ResourceNotFoundException here
    // because we don't want to return a 404 status code, but rather a 415.
    if (!$request->headers
        ->get('Content-Type', FALSE)) {
        throw new UnsupportedMediaTypeHttpException('No "Content-Type" request header specified');
    }
    else {
        throw new UnsupportedMediaTypeHttpException('No route found that matches "Content-Type: ' . $request->headers
            ->get('Content-Type') . '"');
    }
}