# Copyright 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/>.

# T8098: rijndael-cbc@lysator.liu.se was removed in OpenSSH 6.7 which is used
#        starting with VyOS 1.4 - It is an alias for aes256-cbc which was
#        standardized in RFC4253, adjust CLI accordingly.
#        https://github.com/openssh/openssh-portable/commit/03e93c753d7c223063a
#        Also rename "ciphers" -> "cipher" to follow our CLI guidelines to use
#        singular when possible

from vyos.configtree import ConfigTree

base = ['service', 'ssh']

old_path = base + ['ciphers']
new_path = base + ['cipher']

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

    if config.exists(old_path):
        config.rename(old_path, new_path[-1])

    if config.exists(new_path):
        deprecated_cipher = 'rijndael-cbc@lysator.liu.se'
        for cipher in config.return_values(new_path):
            if cipher == deprecated_cipher:
                config.delete_value(new_path, value=deprecated_cipher)
                config.set(new_path, value='aes256-cbc', replace=False)