function login()
{
$code = '';
if (isset($_GET['code'])) {
$code = $_GET['code'];
}
if (!isset($_SESSION)) {
session_start();
}
$token_url = "https://graph.facebook.com/oauth/access_token?" . "client_id=" . FB_APP . "&redirect_uri=" . urlencode(FB_URL) . "&client_secret=" . FB_SECRET . "&code=" . $code;
$response = file_get_contents($token_url);
$params = null;
parse_str($response, $params);
$_SESSION['access_token'] = $params['access_token'];
$graph_url = "https://graph.facebook.com/me?access_token=" . $_SESSION['access_token'];
$fb_user = json_decode(file_get_contents($graph_url));
$user = new User();
//adding the fb_id to the existing email and login
if (!$user->checkLogin($fb_user->email)) {
$user->id = $user->getIDByEmail($fb_user->email);
$user->username = $user->getUsername();
$user->addFBID($fb_user->id);
$user->fb_id = $fb_user->id;
$auth = new SlideWikiAuth($user);
$auth->login();
echo "<script> top.location.href='" . BASE_PATH . "'</script>";
} else {
$this->set('fb_user', $fb_user);
}
}
