# Copyright 2020-2024 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 relative path SSL certificate to absolute path, as certs are only
#   allowed to stored in /config/user-data/sstp/ this is pretty straight
#   forward move. Delete certificates from source directory

import os

from shutil import copy2
from stat import S_IRUSR, S_IWUSR, S_IRGRP, S_IROTH
from vyos.configtree import ConfigTree

base_path = ['vpn', 'sstp', 'ssl']

def migrate(config: ConfigTree) -> None:
    if not config.exists(base_path):
        # Nothing to do
        return

    cert_path_old ='/config/user-data/sstp/'
    cert_path_new ='/config/auth/sstp/'

    if not os.path.isdir(cert_path_new):
        os.mkdir(cert_path_new)

    #
    # migrate ca-cert-file to new path
    if config.exists(base_path + ['ca-cert-file']):
        tmp = config.return_value(base_path + ['ca-cert-file'])
        cert_old = cert_path_old + tmp
        cert_new = cert_path_new + tmp

        if os.path.isfile(cert_old):
            # adjust file permissions on source file,
            # permissions will be copied by copy2()
            os.chmod(cert_old, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH)
            copy2(cert_old, cert_path_new)
            # delete old certificate file
            os.unlink(cert_old)

        config.set(base_path + ['ca-cert-file'], value=cert_new, replace=True)

    #
    # migrate cert-file to new path
    if config.exists(base_path + ['cert-file']):
        tmp = config.return_value(base_path + ['cert-file'])
        cert_old = cert_path_old + tmp
        cert_new = cert_path_new + tmp

        if os.path.isfile(cert_old):
            # adjust file permissions on source file,
            # permissions will be copied by copy2()
            os.chmod(cert_old, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH)
            copy2(cert_old, cert_path_new)
            # delete old certificate file
            os.unlink(cert_old)

        config.set(base_path + ['cert-file'], value=cert_new, replace=True)

    #
    # migrate key-file to new path
    if config.exists(base_path + ['key-file']):
        tmp = config.return_value(base_path + ['key-file'])
        cert_old = cert_path_old + tmp
        cert_new = cert_path_new + tmp

        if os.path.isfile(cert_old):
            # adjust file permissions on source file,
            # permissions will be copied by copy2()
            os.chmod(cert_old, S_IRUSR | S_IWUSR)
            copy2(cert_old, cert_path_new)
            # delete old certificate file
            os.unlink(cert_old)

        config.set(base_path + ['key-file'], value=cert_new, replace=True)

    #
    # check if old certificate directory exists but is empty
    if os.path.isdir(cert_path_old) and not os.listdir(cert_path_old):
        os.rmdir(cert_path_old)