acl action

/**
     * Returns the Response object associated to the acl action.
     *
     * @param int|string|null $id
     * @param Request         $request
     *
     * @return Response|RedirectResponse
     *
     * @throws AccessDeniedException If access is not granted.
     * @throws NotFoundHttpException If the object does not exist or the ACL is not enabled
     */
    public function aclAction($id = null)
    {
        $request = $this->getRequest();

        if (!$this->admin->isAclEnabled()) {
            throw $this->createNotFoundException('ACL are not enabled for this admin');
        }

        $id = $request->get($this->admin->getIdParameter());

        $object = $this->admin->getObject($id);

        if (!$object) {
            throw $this->createNotFoundException(sprintf('unable to find the object with id : %s', $id));
        }

        $this->admin->checkAccess('acl', $object);

        $this->admin->setSubject($object);
        $aclUsers = $this->getAclUsers();
        $aclRoles = $this->getAclRoles();

        $adminObjectAclManipulator = $this->get('sonata.admin.object.manipulator.acl.admin');
        $adminObjectAclData        = new AdminObjectAclData(
            $this->admin,
            $object,
            $aclUsers,
            $adminObjectAclManipulator->getMaskBuilderClass(),
            $aclRoles
        );

        $aclUsersForm = $adminObjectAclManipulator->createAclUsersForm($adminObjectAclData);
        $aclRolesForm = $adminObjectAclManipulator->createAclRolesForm($adminObjectAclData);

        if ($request->getMethod() === 'POST') {
            if ($request->request->has(AdminObjectAclManipulator::ACL_USERS_FORM_NAME)) {
                $form         = $aclUsersForm;
                $updateMethod = 'updateAclUsers';
            } elseif ($request->request->has(AdminObjectAclManipulator::ACL_ROLES_FORM_NAME)) {
                $form         = $aclRolesForm;
                $updateMethod = 'updateAclRoles';
            }

            if (isset($form)) {
                $form->handleRequest($request);

                if ($form->isValid()) {
                    $adminObjectAclManipulator->$updateMethod($adminObjectAclData);
                    $this->addFlash('sonata_flash_success', 'flash_acl_edit_success');

                    return new RedirectResponse($this->admin->generateObjectUrl('acl', $object));
                }
            }
        }

        return $this->render($this->admin->getTemplate('acl'), array(
            'action'       => 'acl',
            'permissions'  => $adminObjectAclData->getUserPermissions(),
            'object'       => $object,
            'users'        => $aclUsers,
            'roles'        => $aclRoles,
            'aclUsersForm' => $aclUsersForm->createView(),
            'aclRolesForm' => $aclRolesForm->createView(),
        ), null, $request);
    }