# Copyright 2021-2024 VyOS maintainers and contributors <maintainers@vyos.io>
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library 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
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with this library.  If not, see <http://www.gnu.org/licenses/>.

# * Migrate system signed certificate to use PKI

from vyos.configtree import ConfigTree
from vyos.pki import create_certificate
from vyos.pki import create_certificate_request
from vyos.pki import create_private_key
from vyos.pki import encode_certificate
from vyos.pki import encode_private_key

base = ['service', 'https', 'certificates']
pki_base = ['pki']

def wrapped_pem_to_config_value(pem):
    out = []
    for line in pem.strip().split("\n"):
        if not line or line.startswith("-----") or line[0] == '#':
            continue
        out.append(line)
    return "".join(out)

def migrate(config: ConfigTree) -> None:
    if not config.exists(base + ['system-generated-certificate']):
        return

    if not config.exists(pki_base + ['certificate']):
        config.set(pki_base + ['certificate'])
        config.set_tag(pki_base + ['certificate'])

    valid_days = 365
    if config.exists(base + ['system-generated-certificate', 'lifetime']):
        valid_days = int(config.return_value(base + ['system-generated-certificate', 'lifetime']))

    key = create_private_key('rsa', 2048)
    subject = {'country': 'GB', 'state': 'N/A', 'locality': 'N/A', 'organization': 'VyOS', 'common_name': 'vyos'}
    cert_req = create_certificate_request(subject, key, ['vyos'])
    cert = create_certificate(cert_req, cert_req, key, valid_days)

    if cert:
        cert_pem = encode_certificate(cert)
        config.set(pki_base + ['certificate', 'generated_https', 'certificate'], value=wrapped_pem_to_config_value(cert_pem))

    if key:
        key_pem = encode_private_key(key)
        config.set(pki_base + ['certificate', 'generated_https', 'private', 'key'], value=wrapped_pem_to_config_value(key_pem))

    if cert and key:
        config.set(base + ['certificate'], value='generated_https')
    else:
        print('Failed to migrate system-generated-certificate from https service')

    config.delete(base + ['system-generated-certificate'])