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#!/usr/bin/env python3
#
# Copyright (C) 2024 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/>.

# T5886: Add support for ACME protocol (LetsEncrypt), migrate https certbot
#        to new "pki certificate" CLI tree
# T5902: Remove virtual-host

import os
import sys

from vyos.configtree import ConfigTree
from vyos.defaults import directories
from vyos.utils.process import cmd

vyos_certbot_dir = directories['certbot']

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 = ['service', 'https']
if not config.exists(base):
    # Nothing to do
    sys.exit(0)

if config.exists(base + ['certificates', 'certbot']):
    # both domain-name and email must be set on CLI - ensured by previous verify()
    domain_names = config.return_values(base + ['certificates', 'certbot', 'domain-name'])
    email = config.return_value(base + ['certificates', 'certbot', 'email'])
    config.delete(base + ['certificates', 'certbot'])

    # Set default certname based on domain-name
    cert_name = 'https-' + domain_names[0].split('.')[0]
    # Overwrite certname from previous certbot calls if available
    # We can not use python code like os.scandir due to filesystem permissions.
    # This must be run as root
    certbot_live = f'{vyos_certbot_dir}/live/' # we need the trailing /
    if os.path.exists(certbot_live):
        tmp = cmd(f'sudo find {certbot_live} -maxdepth 1 -type d')
        tmp = tmp.split() # tmp = ['/config/auth/letsencrypt/live', '/config/auth/letsencrypt/live/router.vyos.net']
        tmp.remove(certbot_live)
        cert_name = tmp[0].replace(certbot_live, '')

    config.set(['pki', 'certificate', cert_name, 'acme', 'email'], value=email)
    config.set_tag(['pki', 'certificate'])
    for domain in domain_names:
        config.set(['pki', 'certificate', cert_name, 'acme', 'domain-name'], value=domain, replace=False)

    # Update Webserver certificate
    config.set(base + ['certificates', 'certificate'], value=cert_name)

if config.exists(base + ['virtual-host']):
    allow_client = []
    listen_port = []
    listen_address = []
    for virtual_host in config.list_nodes(base + ['virtual-host']):
        allow_path = base + ['virtual-host', virtual_host, 'allow-client', 'address']
        if config.exists(allow_path):
            tmp = config.return_values(allow_path)
            allow_client.extend(tmp)

        port_path = base + ['virtual-host', virtual_host, 'listen-port']
        if config.exists(port_path):
            tmp = config.return_value(port_path)
            listen_port.append(tmp)

        listen_address_path = base + ['virtual-host', virtual_host, 'listen-address']
        if config.exists(listen_address_path):
            tmp = config.return_value(listen_address_path)
            listen_address.append(tmp)

    config.delete(base + ['virtual-host'])
    for client in allow_client:
        config.set(base + ['allow-client', 'address'], value=client, replace=False)

    #  clear listen-address if "all" were specified
    if '*' in listen_address:
        listen_address = []
    for address in listen_address:
        config.set(base + ['listen-address'], value=address, replace=False)



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)