<?php
/* vim: set expandtab sw=4 ts=4 sts=4: */
/**
 * Abstract class for the authentication plugins
 *
 * @package PhpMyAdmin
 */
if (! defined('PHPMYADMIN')) {
    exit;
}

/**
 * Provides a common interface that will have to be implemented by all of the
 * authentication plugins.
 *
 * @package PhpMyAdmin
 */
abstract class AuthenticationPlugin
{
    /**
     * Displays authentication form
     *
     * @return boolean
     */
    abstract public function auth();

    /**
     * Gets advanced authentication settings
     *
     * @return boolean
     */
    abstract public function authCheck();

    /**
     * Set the user and password after last checkings if required
     *
     * @return boolean
     */
    abstract public function authSetUser();

    /**
     * User is not allowed to login to MySQL -> authentication failed
     *
     * @return boolean
     */
    abstract public function authFails();

    /**
     * Returns error message for failed authentication.
     *
     * @return string
     */
    public function getErrorMessage()
    {
        if (! empty($GLOBALS['login_without_password_is_forbidden'])) {
            return __(
                'Login without a password is forbidden by configuration'
                . ' (see AllowNoPassword)'
            );
        } elseif (! empty($GLOBALS['allowDeny_forbidden'])) {
            return __('Access denied!');
        } elseif (! empty($GLOBALS['no_activity'])) {
            return sprintf(
                __('No activity within %s seconds; please log in again.'),
                $GLOBALS['cfg']['LoginCookieValidity']
            );
        } else {
            $dbi_error = $GLOBALS['dbi']->getError();
            if ( ! empty($dbi_error)) {
                return PMA_sanitize($dbi_error);
            } elseif (isset($GLOBALS['errno'])) {
                return '#' . $GLOBALS['errno'] . ' '
                    . __('Cannot log in to the MySQL server');
            } else {
                return __('Cannot log in to the MySQL server');
            }
        }
    }

    /**
     * Callback when user changes password.
     *
     * @param string $password New password to set
     *
     * @return array Additional URL parameters.
     */
    public function handlePasswordChange($password)
    {
        return array();
    }
}
?>
