#!/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

import os
import sys

from vyos.configtree import ConfigTree
from vyos.defaults import directories

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', 'certificates']
if not config.exists(base):
    # Nothing to do
    sys.exit(0)

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

# Set default certname based on domain-name
cert_name = 'https-' + domain_names[0].split('.')[0]
# Overwrite certname from previous certbot calls if available
if os.path.exists(f'{vyos_certbot_dir}/live'):
    for cert in [f.path.split('/')[-1] for f in os.scandir(f'{vyos_certbot_dir}/live') if f.is_dir()]:
        cert_name = cert
        break

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

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

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)