server/core/ajax/userlist.php

<?php

/**
* ownCloud - ajax user list
*
* @author Hans Bakker
* @copyright 2011 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(!OC_User::isLoggedIn()){
        if(!isset($_SERVER['PHP_AUTH_USER'])){
                header('WWW-Authenticate: Basic realm="ownCloud Server"');
                header('HTTP/1.0 401 Unauthorized');
                echo 'Valid credentials must be supplied';
                exit();
        } else {
                if(!OC_User::checkPassword($_SERVER["PHP_AUTH_USER"], $_SERVER["PHP_AUTH_PW"])){
                        exit();
                }
        }
}

$users = array();

foreach( OC_User::getUsers() as $i ){
       	$users[] = array( "username" => $i, "groups" => join( ", ", OC_Group::getUserGroups( $i ) ));
}

OC_JSON::encodedPrint($users);

?>