function MethodFilter::filter

Overrides FilterInterface::filter

File

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

Class

MethodFilter

Filters routes based on the HTTP method.

Namespace

Code

public function filter(RouteCollection $collection, Request $request) {
    $method = $request->getMethod();
    $all_supported_methods = [];
    foreach ($collection->all() as $name => $route) {
        $supported_methods = $route->getMethods();
        // A route not restricted to specific methods allows any method. If this
        // is the case, we'll also have at least one route left in the collection,
        // hence we don't need to calculate the set of all supported methods.
        if (empty($supported_methods)) {
            continue;
        }
        // If the GET method is allowed we also need to allow the HEAD method
        // since HEAD is a GET method that doesn't return the body.
        if (in_array('GET', $supported_methods, TRUE)) {
            $supported_methods[] = 'HEAD';
        }
        if (!in_array($method, $supported_methods, TRUE)) {
            $all_supported_methods[] = $supported_methods;
            $collection->remove($name);
        }
    }
    if (count($collection)) {
        return $collection;
    }
    throw new MethodNotAllowedException(array_unique(array_merge(...$all_supported_methods)));
}