#!/usr/bin/env python3
#
# Copyright (C) 2021-2023 VyOS maintainers and contributors
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 or later as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
#
# Deletes Wireguard peers if they have the same public key as the router has.
import sys
from vyos.configtree import ConfigTree
from vyos.validate import is_wireguard_key_pair

if __name__ == '__main__':
    if len(sys.argv) < 2:
        print("Must specify file name!")
        sys.exit(1)

    file_name = sys.argv[1]

    with open(file_name, 'r') as f:
        config_file = f.read()

    config = ConfigTree(config_file)
    base = ['interfaces', 'wireguard']
    if not config.exists(base):
        # Nothing to do
        sys.exit(0)
    for interface in config.list_nodes(base):
        private_key = config.return_value(base + [interface, 'private-key'])
        interface_base = base + [interface]
        if config.exists(interface_base + ['peer']):
            for peer in config.list_nodes(interface_base + ['peer']):
                peer_base = interface_base + ['peer', peer]
                peer_public_key = config.return_value(peer_base + ['public-key'])
                if config.exists(peer_base + ['public-key']):
                    if not config.exists(peer_base + ['disable']) \
                            and is_wireguard_key_pair(private_key, peer_public_key):
                        config.set(peer_base + ['disable'])

    try:
        with open(file_name, 'w') as f:
            f.write(config.to_string())
    except OSError as e:
        print("Failed to save the modified config: {}".format(e))
        sys.exit(1)