public static function get_by_oauth_token($oauth_token) {
	$mysql = bootstrap::get_library('mysql');
	
	$sql   = "SELECT * FROM `login_github` WHERE `oauth_token` = '%s';";
	$login = $mysql::select('row', $sql, $oauth_token);
	if (empty($login)) {
		return false;
	}
	
	return new static($login['id']);
}