server/core/ajax/validateuser.php

<?php

/**
* ownCloud
*
* @author Hans Bakker
* @copyright 2011 Hans Bakker hansmbakker+kde@gmail.com
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU AFFERO GENERAL PUBLIC LICENSE
* License as published by the Free Software Foundation; either
* version 3 of the License, or any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
* GNU AFFERO GENERAL PUBLIC LICENSE for more details.
*
* You should have received a copy of the GNU Affero General Public
* License along with this library.  If not, see <http://www.gnu.org/licenses/>.
*
*/

$RUNTIME_NOAPPS = TRUE; //no apps, yet
require_once('../../lib/base.php');

if(!isset($_SERVER['PHP_AUTH_USER'])){
        header('WWW-Authenticate: Basic realm="ownCloud Server"');
        header('HTTP/1.0 401 Unauthorized');
        echo 'Valid credentials must be supplied';
        exit();
} else {
	header("Content-Type: application/jsonrequest");
        if(OC_User::checkPassword($_SERVER["PHP_AUTH_USER"], $_SERVER["PHP_AUTH_PW"])){
		echo json_encode(array("username" => $_SERVER["PHP_AUTH_USER"], "user_valid" => "true"));
	} else {
	        echo json_encode(array("username" => $_SERVER["PHP_AUTH_USER"], "user_valid" => "false"));
	}
}

?>