#! /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
try:
    from optparse import OptionParser
    import ipa.ipaclient as ipaclient
    import ipa.config
    import ipa.ipautil as ipautil

    import operator
    import xmlrpclib
    import kerberos
    import errno
    import socket

    import ipa.aci
    from ipa import ipaerror
except ImportError:
    print >> sys.stderr, """\
There was a problem importing one of the required Python modules. The
error was:

    %s
""" % sys.exc_value
    sys.exit(1)

aci_fields = ['*', 'aci']

def parse_options():
    parser = OptionParser()
    parser.add_option("-s", "--source", dest="source",
                      help="Source group of delegation")
    parser.add_option("-n", "--name", dest="name",
                      help="Name of delegation")
    parser.add_option("-t", "--target", dest="target",
                      help="Target group of delegation")
    parser.add_option("-v", "--verbose", action="store_true", dest="verbose",
                      help="Verbose output of the XML-RPC connection")

    ipa.config.add_standard_options(parser)
    options, args = parser.parse_args()
    ipa.config.verify_args(parser, args)
    ipa.config.init_config(options)

    return options, args

def main():

    options, args = parse_options()

    all = True
    if options.name or options.source or options.target:
        all = False

    client = ipaclient.IPAClient(verbose=options.verbose)
    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]

    aci_list = []
    for aci_str in aci_str_list:
        try:
            aci = ipa.aci.ACI(aci_str)
            aci_list.append(aci)
        except SyntaxError:
            # ignore aci_str's that ACI can't parse
            pass

    group_dn_to_cn = ipa.aci.extract_group_cns(aci_list, client)

    found = False
    # the operator.itemgetter(0) lets us sort by the name field
    for a in sorted(aci_list, key=operator.itemgetter(0)):
        labels = client.attrs_to_labels(a.attrs)
        if (all or options.name == a.name or
            options.source == group_dn_to_cn[a.source_group] or
            options.target == group_dn_to_cn[a.dest_group]):
            print "Delegation Name: " + a.name
            print "Group " + group_dn_to_cn[a.source_group]
            print "  can modify these attributes: "
            for l in labels:
                print "\t" + labels[l]
            print "  for group " + group_dn_to_cn[a.dest_group]
            print
            found = True

    if found:
        return 0
    else:
        return 2

try:
    if __name__ == "__main__":
        sys.exit(main())
except SystemExit, e:
    sys.exit(e)
except KeyboardInterrupt, e:
    sys.exit(1)
except xmlrpclib.Fault, fault:
    if fault.faultCode == errno.ECONNREFUSED:
        print "The IPA XML-RPC service is not responding."
    else:
        print fault.faultString
    sys.exit(1)
except kerberos.GSSError, e:
    print "Could not initialize GSSAPI: %s/%s" % (ipautil.get_gsserror(e))
    sys.exit(1)
except xmlrpclib.ProtocolError, e:
    print "Unable to connect to IPA server: %s" % (e.errmsg)
    sys.exit(1)
except ipaerror.IPAError, e:
    print("Delegation list failed: " + str(e))
    sys.exit(1)
except socket.error, e:
    print e[1]
    print "Re-run with -v flag for more details."
except Exception, e:
    print "%s" % str(e)
    sys.exit(1)