# Authors:
#   Jan Cholasta <jcholast@redhat.com>
#
# Copyright (C) 2014  Red Hat
# see file 'COPYING' for use and warranty information
#
# 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 <http://www.gnu.org/licenses/>.

from ipaserver.install import installutils, cainstance
from ipalib import errors
from ipalib import Updater
from ipalib.install import certmonger
from ipalib.plugable import Registry
from ipaplatform.paths import paths
from ipapython.dn import DN

register = Registry()

@register()
class update_ca_renewal_master(Updater):
    """
    Set CA renewal master in LDAP.
    """

    def execute(self, **options):
        ca = cainstance.CAInstance(self.api.env.realm)
        if not ca.is_configured():
            self.debug("CA is not configured on this host")
            return False, []

        ldap = self.api.Backend.ldap2
        base_dn = DN(('cn', 'masters'), ('cn', 'ipa'), ('cn', 'etc'),
                     self.api.env.basedn)
        dn = DN(('cn', 'CA'), ('cn', self.api.env.host), base_dn)
        filter = '(&(cn=CA)(ipaConfigString=caRenewalMaster))'
        try:
            entries = ldap.get_entries(base_dn=base_dn, filter=filter,
                                       attrs_list=[])
        except errors.NotFound:
            pass
        else:
            self.debug("found CA renewal master %s", entries[0].dn[1].value)

            master = False
            updates = []

            for entry in entries:
                if entry.dn == dn:
                    master = True
                    continue

                updates.append({
                    'dn': entry.dn,
                    'updates': [
                        dict(action='remove', attr='ipaConfigString',
                             value='caRenewalMaster')
                    ],
                })

            if master:
                return False, updates
            else:
                return False, []

        criteria = {
            'cert-file': paths.RA_AGENT_PEM,
        }
        request_id = certmonger.get_request_id(criteria)
        if request_id is not None:
            self.debug("found certmonger request for RA cert")

            ca_name = certmonger.get_request_value(request_id, 'ca-name')
            if ca_name is None:
                self.warning(
                    "certmonger request for RA cert is missing ca_name, "
                    "assuming local CA is renewal slave")
                return False, []
            ca_name = ca_name.strip()

            if ca_name == 'dogtag-ipa-renew-agent':
                pass
            elif ca_name == 'dogtag-ipa-retrieve-agent-submit':
                return False, []
            elif ca_name == 'dogtag-ipa-ca-renew-agent':
                return False, []
            else:
                self.warning(
                    "certmonger request for RA cert has unknown ca_name '%s', "
                    "assuming local CA is renewal slave", ca_name)
                return False, []
        else:
            self.debug("certmonger request for RA cert not found")

            config = installutils.get_directive(
                paths.CA_CS_CFG_PATH, 'subsystem.select', '=')

            if config == 'New':
                pass
            elif config == 'Clone':
                return False, []
            else:
                self.warning(
                    "CS.cfg has unknown subsystem.select value '%s', "
                    "assuming local CA is renewal slave", config)
                return (False, False, [])

        update = {
                'dn': dn,
                'updates': [
                    dict(action='add', attr='ipaConfigString',
                         value='caRenewalMaster')
                ],
        }

        return False, [update]
