#!/usr/bin/python2.4
# -*- coding: utf-8 -*-
#
# Univention SSL
#  checks validity of the local SSL certificate
#
# Copyright 2008-2018 Univention GmbH
#
# https://www.univention.de/
#
# All rights reserved.
#
# The source code of this program is made available
# under the terms of the GNU Affero General Public License version 3
# (GNU AGPL V3) as published by the Free Software Foundation.
#
# Binary versions of this program provided by Univention to you as
# well as other copyrighted, protected or trademarked materials like
# Logos, graphics, fonts, specific documentations and configurations,
# cryptographic keys etc. are subject to a license agreement between
# you and Univention and not subject to the GNU AGPL V3.
#
# In the case you use this program under the terms of the GNU AGPL V3,
# the program is provided 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 with the Debian GNU/Linux or Univention distribution in file
# /usr/share/common-licenses/AGPL-3; if not, see
# <https://www.gnu.org/licenses/>.

import time
import calendar

from M2Crypto import X509

import univention_baseconfig

_bc = univention_baseconfig.baseConfig()
_bc.load()


def get_validity_date():
    """ returns the validity date fo the locale SSL certificate or None on failure"""
    global _bc
    try:
        fqdn = '.'.join([_bc['hostname'], _bc['domainname']])

        x509 = X509.load_cert('/etc/univention/ssl/%s/cert.pem' % fqdn)
        return str(x509.get_not_after())
    except Exception:
        return None


def get_validity_days():
    """returns the validity of the local SSL certificate in days. If the
    validity could not be determined 0 is returned"""
    after = get_validity_date()
    if after:
        time_after = time.strptime(after, "%b %d %H:%M:%S %Y %Z")
        return calendar.timegm(time_after) / 60 / 60 / 24

    return 0


if __name__ == '__main__':
    days = get_validity_days()
    if days and days != _bc.get('ssl/validity/days', -1):
        _bc['ssl/validity/days'] = str(days)
        _bc.save()
