#! /usr/bin/python -E
# Authors: Rob Crittenden <rcritten@redhat.com>
#
# Copyright (C) 2007  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; version 2 only
#
# 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, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#

import sys
from optparse import OptionParser
import ipa
import ipa.user
import ipa.ipaclient as ipaclient
import ipa.ipaadminutil as ipaadminutil
import ipa.config
import ipa.aci

import xmlrpclib
import kerberos
import krbV
import ldap
import copy
import errno

aci_fields = ['*', 'aci']

def usage():
    print "ipa-moddelgation [-a|--attributes attr1,attr2,..,attrn] [-s|--source STRING] [-t|--target STRING] name"
    sys.exit(1)

def parse_options():
    parser = OptionParser()
    parser.add_option("-a", "--attributes", dest="attributes",
                      help="The attributes the source group may change in the target group")
    parser.add_option("-s", "--source", dest="source",
                      help="The source group name")
    parser.add_option("-t", "--target", dest="target",
                      help="The target group name")
    parser.add_option("--usage", action="store_true",
                      help="Program usage")

    args = ipa.config.init_config(sys.argv)
    options, args = parser.parse_args(args)

    return options, args

def main():

    options, args = parse_options()

    if options.usage or len(args) != 2:
        usage()

    if not options.attributes and not options.source and not options.target:
        print "Missing something"
        usage()

    try:
        client = ipaclient.IPAClient()

        # first do some sanity checking

        if options.source:
            source_grp = client.find_groups(options.source)
            counter = source_grp[0]
            source_grp = source_grp[1:]
            groupindex = -1
            if counter == 0:
                print "No entries found for %s" % options.source
                return 2 
            elif counter == -1:
                print "These results are truncated."
                print "Please refine your search and try again."
                return 3

            if counter > 1:
                print "\nMultiple entries for the source group found."
                groupindex = ipaadminutil.select_group(counter, source_grp)
                if groupindex == "q":
                    return 0

            if groupindex >= 0:
                source_grp = [source_grp[groupindex]]

        if options.target:
            target_grp = client.find_groups(options.target)
            counter = target_grp[0]
            target_grp = target_grp[1:]
            groupindex = -1
            if counter == 0:
                print "No entries found for %s" % options.target
                return 2 
            elif counter == -1:
                print "These results are truncated."
                print "Please refine your search and try again."
                return 3

            if counter > 1:
                print "\nMultiple entries for the target group found."
                groupindex = ipaadminutil.select_group(counter, target_grp)
                if groupindex == "q":
                    return 0

            if groupindex >= 0:
                target_grp = [target_grp[groupindex]]

        if options.attributes:
            attr_list = options.attributes.split(',')

        # find the old aci

        aci_entry = client.get_aci_entry(aci_fields)

        aci_str_list = aci_entry.getValues('aci')
        if aci_str_list is None:
            aci_str_list = []
        if not(isinstance(aci_str_list,list) or isinstance(aci_str_list,tuple)):
            aci_str_list = [aci_str_list]

        old_aci = None
        acistr = None
        for aci_str in aci_str_list:
            try:
                old_aci = ipa.aci.ACI(aci_str)
                if old_aci.name == args[1]:
                    acistr = aci_str
                    break
            except SyntaxError:
                # ignore aci_str's that ACI can't parse
                pass

        if acistr is None:
            print "No delegation %s found." % args[1]
            return 2

        old_aci_index = aci_str_list.index(acistr)

        new_aci = ipa.aci.ACI()
        new_aci.name = args[1]
        if options.source:
            new_aci.source_group = source_grp[0].dn
        else:
            new_aci.source_group = old_aci.source_group
        if options.target:
            new_aci.dest_group = target_grp[0].dn
        else:
            new_aci.dest_group = old_aci.dest_group
        if options.attributes:
            new_aci.attrs = attr_list
        else:
            new_aci.attrs = old_aci.attrs
        new_aci_str = new_aci.export_to_string()

        new_aci_str_list = copy.deepcopy(aci_str_list)
        new_aci_str_list[old_aci_index] = new_aci_str
        aci_entry.setValue('aci', new_aci_str_list)

        client.update_entry(aci_entry)
    except xmlrpclib.Fault, fault:
        if fault.faultCode == errno.ECONNREFUSED:
            print "The IPA XML-RPC service is not responding."
        else:
            print fault.faultString
        return 1
    except kerberos.GSSError, e:
        print "Could not initialize GSSAPI: %s/%s" % (e[0][0][0], e[0][1][0])
        return 1
    except xmlrpclib.ProtocolError, e:
        print "Unable to connect to IPA server: %s" % (e.errmsg)
        return 1
    except ipa.ipaerror.IPAError, e:
        print "%s" % (e.message)
        return 1

    print "Delegation %s successfully updated" % args[1]
    return 0

if __name__ == "__main__":
    sys.exit(main())