# Authors:
#   Rob Crittenden <rcritten@redhat.com>
#
# Copyright (C) 2008  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

"""
Frontend plugins for password policy.
"""

from ipalib import frontend
from ipalib import crud
from ipalib.frontend import Param
from ipalib import api
from ipalib import errors
from ipalib import ipa_types


class pwpolicy_mod(frontend.Command):
    'Edit existing password policy.'
    takes_options = (
        Param('krbmaxpwdlife?',
            cli_name='maxlife',
            type=ipa_types.Int(),
            doc='Max. Password Lifetime (days)'
        ),
        Param('krbminpwdlife?',
            cli_name='minlife',
            type=ipa_types.Int(),
            doc='Min. Password Lifetime (hours)'
        ),
        Param('krbpwdhistorylength?',
            cli_name='history',
            type=ipa_types.Int(),
            doc='Password History Size'
        ),
        Param('krbpwdmindiffchars?',
            cli_name='minclasses',
            type=ipa_types.Int(),
            doc='Min. Number of Character Classes'
        ),
        Param('krbpwdminlength?',
            cli_name='minlength',
            type=ipa_types.Int(),
            doc='Min. Length of Password'
        ),
    )
    def execute(self, *args, **kw):
        """
        Execute the pwpolicy-mod operation.

        The dn should not be passed as a keyword argument as it is constructed
        by this method.

        Returns the entry

        :param args: This function takes no positional arguments
        :param kw: Keyword arguments for the other LDAP attributes.
        """
        assert 'dn' not in kw
        ldap = self.api.Backend.ldap
        dn = ldap.find_entry_dn("cn", "accounts", "krbPwdPolicy")

        # The LDAP routines want strings, not ints, so convert a few
        # things. Otherwise it sees a string -> int conversion as a change.
        for k in kw.iterkeys():
            if k.startswith("krb", 0, 3):
                kw[k] = str(kw[k])

        # Convert hours and days to seconds
        if kw.get('krbmaxpwdlife'):
            kw['krbmaxpwdlife'] = str(int(kw.get('krbmaxpwdlife')) * 86400)
        if kw.get('krbminpwdlife'):
            kw['krbminpwdlife'] = str(int(kw.get('krbminpwdlife')) * 3600)

        return ldap.update(dn, **kw)

    def output_for_cli(self, ret):
        if ret:
            print "Policy modified"

api.register(pwpolicy_mod)


class pwpolicy_show(frontend.Command):
    'Retrieve current password policy'
    def execute(self, *args, **kw):
        """
        Execute the pwpolicy-show operation.

        The dn should not be passed as a keyword argument as it is constructed
        by this method.

        Returns the entry

        :param args: Not used.
        :param kw: Not used.
        """
        ldap = self.api.Backend.ldap
        dn = ldap.find_entry_dn("cn", "accounts", "krbPwdPolicy")

        policy = ldap.retrieve(dn)

        # convert some values for display purposes
        policy['krbmaxpwdlife'] = str(int(policy.get('krbmaxpwdlife')) / 86400)
        policy['krbminpwdlife'] = str(int(policy.get('krbminpwdlife')) / 3600)

        return policy

    def output_for_cli(self, policy):
        if not policy: return

        print "Password Policy"
        print "Min. Password Lifetime (hours): %s" % policy.get('krbminpwdlife')
        print "Max. Password Lifetime (days): %s" % policy.get('krbmaxpwdlife')
        print "Min. Number of Character Classes: %s" % policy.get('krbpwdmindiffchars')
        print "Min. Length of Password: %s" % policy.get('krbpwdminlength')
        print "Password History Size: %s" % policy.get('krbpwdhistorylength')

api.register(pwpolicy_show)