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<?php
/**
* Elgg session management
* Functions to manage logins
*
* @package Elgg
* @subpackage Core
* @license http://www.gnu.org/licenses/old-licenses/gpl-2.0.html GNU Public License version 2
* @author Curverider Ltd
* @copyright Curverider Ltd 2008
* @link http://elgg.org/
*/
/**
* Returns whether or not the user is currently logged in
*
* @uses $_SESSION
* @return true|false
*/
function isloggedin() {
if ((isset($_SESSION['guid'])) && ($_SESSION['guid'] > 0))
return true;
return false;
}
/**
* Perform standard authentication with a given username and password.
* Returns an ElggUser object for use with login.
*
* @see login
* @param string $username The username, optionally (for standard logins)
* @param string $password The password, optionally (for standard logins)
* @return ElggUser|false The authenticated user object, or false on failure.
*/
function authenticate($username, $password) {
$dbpassword = md5($password);
if ($user = get_user_by_username($username)) {
if ($user->password == $dbpassword) {
return $user;
}
}
return false;
}
/**
* Logs in a specified ElggUser. For standard registration, use in conjunction
* with authenticate.
*
* @see authenticate
* @param ElggUser $user A valid Elgg user object
* @param boolean $persistent Should this be a persistent login?
* @return true|false Whether login was successful
*/
function login(ElggUser $user, $persistent = false) {
global $CONFIG;
$_SESSION['user'] = $user;
$_SESSION['guid'] = $user->getGUID();
$_SESSION['id'] = $_SESSION['guid'];
$_SESSION['username'] = $user->username;
$_SESSION['name'] = $user->name;
$code = (md5($user->name . $user->username . time() . rand()));
$user->code = md5($code);
$_SESSION['code'] = $code;
if (($persistent))
setcookie("elggperm", $code, (time()+(86400 * 30)),"/");
if (!$user->save() || !trigger_elgg_event('login','user',$user)) {
unset($_SESSION['username']);
unset($_SESSION['name']);
unset($_SESSION['code']);
unset($_SESSION['guid']);
unset($_SESSION['id']);
unset($_SESSION['user']);
setcookie("elggperm", "", (time()-(86400 * 30)),"/");
return false;
}
return true;
}
/**
* Log the current user out
*
* @return true|false
*/
function logout() {
global $CONFIG;
if (isset($_SESSION['user'])) {
if (!trigger_elgg_event('logout','user',$_SESSION['user'])) return false;
$_SESSION['user']->code = "";
$_SESSION['user']->save();
}
unset($_SESSION['username']);
unset($_SESSION['name']);
unset($_SESSION['code']);
unset($_SESSION['guid']);
unset($_SESSION['id']);
unset($_SESSION['user']);
setcookie("elggperm", "", (time()-(86400 * 30)),"/");
return true;
}
/**
* Initialises the system session and potentially logs the user in
*
* This function looks for:
*
* 1. $_SESSION['id'] - if not present, we're logged out, and this is set to 0
* 2. The cookie 'elggperm' - if present, checks it for an authentication token, validates it, and potentially logs the user in
*
* @uses $_SESSION
* @param unknown_type $event
* @param unknown_type $object_type
* @param unknown_type $object
*/
function session_init($event, $object_type, $object) {
if (!is_db_installed()) return false;
session_name('Elgg');
session_start();
if (empty($_SESSION['guid'])) {
if (isset($_COOKIE['elggperm'])) {
$code = $_COOKIE['elggperm'];
$code = md5($code);
$_SESSION['guid'] = 0;
$_SESSION['id'] = 0;
if ($user = get_user_by_code($code)) {
$_SESSION['user'] = $user;
$_SESSION['id'] = $user->getGUID();
$_SESSION['guid'] = $_SESSION['id'];
$_SESSION['code'] = $_COOKIE['elggperm'];
}
} else {
$_SESSION['id'] = 0;
$_SESSION['guid'] = 0;
}
} else {
if (!empty($_SESSION['code'])) {
$code = md5($_SESSION['code']);
if ($user = get_user_by_code($code)) {
$_SESSION['user'] = $user;
} else {
unset($_SESSION['user']);
$_SESSION['guid'] = 0;
$_SESSION['id'] = 0;
}
} else {
$_SESSION['guid'] = 0;
$_SESSION['id'] = 0;
}
}
if ($_SESSION['id'] > 0) {
// set_last_action($_SESSION['id']);
}
register_action("login",true);
register_action("logout");
return true;
}
/**
* Used at the top of a page to mark it as logged in users only.
*
*/
function gatekeeper() {
if (!isloggedin()) forward();
}
/**
* Used at the top of a page to mark it as logged in admin or siteadmin only.
*
*/
function admin_gatekeeper()
{
gatekeeper();
if (!$_SESSION['user']->admin && !$_SESSION['user']->siteadmin) forward();
}
register_elgg_event_handler("boot","system","session_init",1);
?>
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