function getTrustedToken($user)
{
if (!$user) {
WindowsLiveLogin::debug('Error: getTrustedToken: Null user specified.');
return;
}
$token = "appid=" . WindowsLiveLogin::getAppId() . "&uid=" . urlencode($user) . "&ts=" . WindowsLiveLogin::getTimestamp();
$token .= "&sig=" . WindowsLiveLogin::e64(WindowsLiveLogin::signToken($token));
return urlencode($token);
}