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#!/usr/bin/python3
# -*- mode: python -*-
#
# This file is part of Plinth.
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero 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 Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
#

"""
Configuration helper for Roundcube server.
"""

import argparse
import re
import subprocess

from plinth import action_utils


APACHE_CONF = '/etc/apache2/conf-available/roundcube.conf'


def parse_arguments():
    """Return parsed command line arguments as dictionary."""
    parser = argparse.ArgumentParser()
    subparsers = parser.add_subparsers(dest='subcommand', help='Sub command')

    subparsers.add_parser('pre-install',
                          help='Perform Roundcube pre-install configuration')
    subparsers.add_parser('setup',
                          help='Perform Roundcube configuration setup')
    subparsers.add_parser('enable', help='Enable Roundcube')
    subparsers.add_parser('disable', help='Disable Roundcube')

    return parser.parse_args()


def subcommand_pre_install(_):
    """Preseed debconf values before packages are installed."""
    subprocess.check_output(
        ['debconf-set-selections'],
        input=b'roundcube-core roundcube/dbconfig-install boolean true')
    subprocess.check_output(
        ['debconf-set-selections'],
        input=b'roundcube-core roundcube/database-type string sqlite3')


def subcommand_setup(_):
    """Setup Roundcube Apache configuration."""
    with open(APACHE_CONF, 'r') as conffile:
        lines = conffile.readlines()

    with open(APACHE_CONF, 'w') as conffile:
        for line in lines:
            match = re.match(r'#\s*(Alias /roundcube.*)', line)
            if match:
                conffile.write(match.group(1) + '\n')
            else:
                conffile.write(line)

    action_utils.service_reload('apache2')


def subcommand_enable(_):
    """Enable web configuration and reload."""
    action_utils.webserver_enable('roundcube')


def subcommand_disable(_):
    """Disable web configuration and reload."""
    action_utils.webserver_disable('roundcube')


def main():
    """Parse arguments and perform all duties."""
    arguments = parse_arguments()

    subcommand = arguments.subcommand.replace('-', '_')
    subcommand_method = globals()['subcommand_' + subcommand]
    subcommand_method(arguments)


if __name__ == '__main__':
    main()