#!/usr/bin/env python
# Copyright Luke Morrison <luc785@.hotmail.com> July 2013
# Co-Edited by Matthieu Pattou July 2013 from original August 2013
# Edited by Garming Sam Feb. 2014
# Edited by Luke Morrison April 2014
# Edited by David Mulder May 2017

# 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/>.

'''This script reads a log file of previous GPO, gets all GPO from sysvol
and sorts them by container. Then, it applies the ones that haven't been
applied, have changed, or is in the right container'''

import os
import sys

sys.path.insert(0, "bin/python")

import optparse
from samba import getopt as options
from samba.auth import system_session
try:
    from samba.samdb import SamDB
except:
    SamDB = None
from samba.gpclass import apply_gp, unapply_gp, GPOStorage
from samba.gp_sec_ext import gp_sec_ext
from samba.gp_ext_loader import get_gp_client_side_extensions
import logging

if __name__ == "__main__":
    parser = optparse.OptionParser('samba-gpupdate [options]')
    sambaopts = options.SambaOptions(parser)

    # Get the command line options
    parser.add_option_group(sambaopts)
    parser.add_option_group(options.VersionOptions(parser))
    credopts = options.CredentialsOptions(parser)
    parser.add_option('-H', '--url', dest='url', help='URL for the samdb')
    parser.add_option('-X', '--unapply', help='Unapply Group Policy',
                      action='store_true')
    parser.add_option('--target', default='Computer', help='{Computer | User}',
                      choices=['Computer', 'User'])
    parser.add_option_group(credopts)

    # Set the options and the arguments
    (opts, args) = parser.parse_args()

    # Set the loadparm context
    lp = sambaopts.get_loadparm()
    if not opts.url:
        url = lp.samdb_url()
    else:
        url = opts.url

    # Initialize the session
    creds = credopts.get_credentials(lp, fallback_machine=True)
    session = system_session()

    # Set up logging
    logger = logging.getLogger('samba-gpupdate')
    logger.addHandler(logging.StreamHandler(sys.stdout))
    logger.setLevel(logging.CRITICAL)
    log_level = lp.log_level()
    if log_level == 1:
        logger.setLevel(logging.ERROR)
    elif log_level == 2:
        logger.setLevel(logging.WARNING)
    elif log_level == 3:
        logger.setLevel(logging.INFO)
    elif log_level >= 4:
        logger.setLevel(logging.DEBUG)

    cache_dir = lp.get('cache directory')
    store = GPOStorage(os.path.join(cache_dir, 'gpo.tdb'))

    machine_exts = get_gp_client_side_extensions(logger, lp.configfile)
    gp_extensions = []
    if opts.target == 'Computer':
        if lp.get('server role') == 'active directory domain controller':
            gp_extensions.append(gp_sec_ext(logger))
        for ext in machine_exts:
            gp_extensions.append(ext(logger))
    elif opts.target == 'User':
        pass # User extensions

    # Get a live instance of Samba
    if SamDB:
        test_ldb = SamDB(url, session_info=session, credentials=creds, lp=lp)
    else:
        test_ldb = None

    if not opts.unapply:
        apply_gp(lp, creds, test_ldb, logger, store, gp_extensions)
    else:
        unapply_gp(lp, creds, test_ldb, logger, store, gp_extensions)