#!/usr/bin/python3

# Copyright (C) 2013-2021 Daniel Baumann <daniel@debian.org>
#
# SPDX-License-Identifier: GPL-3.0+
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# 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 <https://www.gnu.org/licenses/>.

from ipaddress import ip_address
from json import dumps
from os import getenv
from subprocess import Popen, PIPE
from sys import exit

from pygments import highlight
from pygments.lexers import JsonLexer
from pygments.formatters import TerminalFormatter

def run_command(command):
    process = Popen(command, stdout=PIPE)
    empty_lines = 0
    while True:
        line = process.stdout.readline().rstrip()
        if not line:
            empty_lines = empty_lines + 1
            if empty_lines > 2:
                break
            else:
                print()
        else:
            empty_lines = 0
            yield line.decode('utf-8')

def v0_dns_a():
    a = 'google.com'
    cgi = getenv('GATEWAY_INTERFACE')

    #command_line = 'kdig +json A ' + a + ' | jq -r -M \'.answer | .[] | .rdata\''
    command_line = 'kdig +json A ' + a

    kdig = Popen(command_line.split(), stdout=PIPE)

#    try:
#        ip = str(ip_address(address))
#        if ip_address(address).version == 4:
#            ip_version = 'ipv4'
#        elif ip_address(address).version == 6:
#            ip_version = 'ipv6'
#        else:
#            ip_version = None
#        message = 'valid IP address'
#        status = True
#    except ValueError:
#        ip = None
#        ip_version = None
#        message = 'invalid IP address'
#        status = False

    status = True
    message = 'valid DNS record'

    json = \
    {
      'data': {
        'record': a,
      },
      'meta': {
        'status': status,
        'message': message,
      },
    }

    if cgi:
        print('Content-Type: application/json\n')
        print(dumps(json))
    else:
        print(highlight(dumps(json, indent=4), JsonLexer(), TerminalFormatter()))

    exit(0)

if __name__ == '__main__':
    v0_dns_a()