Backend\Modules\Authentication\Actions\Index::getAllowedAction PHP Method

    private function getAllowedAction($module)
    {
        if (BackendAuthentication::isAllowedAction('Index', $module)) {
            return 'Index';
        }
        $allowedAction = false;
        $groupsRightsActions = BackendUsersModel::getModuleGroupsRightsActions($module);
        foreach ($groupsRightsActions as $groupsRightsAction) {
            $isAllowedAction = BackendAuthentication::isAllowedAction($groupsRightsAction['action'], $module);
            if ($isAllowedAction) {
                $allowedAction = $groupsRightsAction['action'];
                break;
            }
        }
        return $allowedAction;
    }