<?php
/**
 * EGroupware API - Authentication backend interface
 *
 * @link http://www.egroupware.org
 * @author Ralf Becker <ralfbecker@outdoor-training.de>
 * @license http://opensource.org/licenses/lgpl-license.php LGPL - GNU Lesser General Public License
 * @package api
 * @subpackage authentication
 * @version $Id$
 */

namespace EGroupware\Api\Auth;

/**
 * Interface for authentication backend
 */
interface Backend
{
	/**
	 * password authentication against password stored in sql datababse
	 *
	 * @param string $username username of account to authenticate
	 * @param string $passwd corresponding password
	 * @param string $passwd_type ='text' 'text' for cleartext passwords (default)
	 * @return boolean true if successful authenticated, false otherwise
	 */
	function authenticate($username, $passwd, $passwd_type='text');

	/**
	 * changes password in sql datababse
	 *
	 * @param string $old_passwd must be cleartext
	 * @param string $new_passwd must be cleartext
	 * @param int $account_id account id of user whose passwd should be changed
	 * @throws Exception to give a verbose error, why changing password failed
	 * @return boolean true if password successful changed, false otherwise
	 */
	function change_password($old_passwd, $new_passwd, $account_id=0);
}