public static function fallback($info) {
        $user = isset($info['user']) ? $info['user'] : null;
        $publicKey = isset($info['publicKey']) ? $info['publicKey'] : null;

        if (!$user && $publicKey) {
            $info['user'] = $publicKey;
        } else if (!$publicKey && $user) {
            $info['publicKey'] = $user;
        }

        return $info;
    }