#   Copyright 2019 Red Hat, Inc.
#
#   Licensed under the Apache License, Version 2.0 (the "License"); you may
#   not use this file except in compliance with the License. You may obtain
#   a copy of the License at
#
#        http://www.apache.org/licenses/LICENSE-2.0
#
#   Unless required by applicable law or agreed to in writing, software
#   distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
#   WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
#   License for the specific language governing permissions and limitations
#   under the License.

import socket


def bracket_ipv6(address):
    """Put a bracket around address if it is valid IPv6

    Return it unchanged if it is a hostname or IPv4 address.
    """
    try:
        socket.inet_pton(socket.AF_INET6, address)
        return "[%s]" % address
    except socket.error:
        return address