# authutils -- miscelanneous functions for handling passwords and publis keys
#
# Copyright (C) 2018 VyOS maintainers and contributors
#
# 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, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 

import re

from subprocess import Popen, PIPE, STDOUT


def make_password_hash(password):
    """ Makes a password hash for /etc/shadow using mkpasswd """

    mkpasswd = Popen(['mkpasswd', '--method=sha-512', '--stdin'], stdout=PIPE, stdin=PIPE, stderr=PIPE)
    hash = mkpasswd.communicate(input=password.encode(), timeout=5)[0].decode().strip()

    return hash

def split_ssh_public_key(key_string, defaultname=""):
    """ Splits an SSH public key into its components """

    key_string = key_string.strip()
    parts = re.split(r'\s+', key_string)

    if len(parts) == 3:
        key_type, key_data, key_name = parts[0], parts[1], parts[2]
    else:
        key_type, key_data, key_name = parts[0], parts[1], defaultname

    if key_type not in ['ssh-rsa', 'ssh-dss', 'ecdsa-sha2-nistp256', 'ecdsa-sha2-nistp384', 'ecdsa-sha2-nistp521', 'ssh-ed25519']:
        raise ValueError("Bad key type \'{0}\', must be one of must be one of ssh-rsa, ssh-dss, ecdsa-sha2-nistp<256|384|521> or ssh-ed25519".format(key_type))

    return({"type": key_type, "data": key_data, "name": key_name})