Method checkToken

/**
 * Checks for a form token in the request.
 *
 * Use in conjunction with HTMLHelper::_('form.token') or Session::getFormToken.
 *
 * @param   string   $method    The request method in which to look for the token key.
 * @param   boolean  $redirect  Whether to implicitly redirect user to the referrer page on failure or simply return false.
 *
 * @return  boolean  True if found and valid, otherwise return false or redirect to referrer page.
 *
 * @since   3.7.0
 * @see     Session::checkToken()
 */
public function checkToken($method = 'post', $redirect = true)
{
    $valid = Session::checkToken($method);
    if (!$valid && $redirect) {
        $referrer = $this->input->server->getString('HTTP_REFERER');
        if (!Uri::isInternal($referrer)) {
            $referrer = 'index.php';
        }
        $this->app->enqueueMessage(Text::_('JINVALID_TOKEN_NOTICE'), 'warning');
        $this->app->redirect($referrer);
    }
    return $valid;
}