# Authors:
#   Thierry Bordaz <tbordaz@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/>.

import six

from ipalib import api, errors
from ipalib import (
    Flag, Int, Password, Str, Bool, StrEnum, DateTime, DNParam)
from ipalib.parameters import Principal, Certificate
from ipalib.plugable import Registry
from .baseldap import (
    DN, LDAPObject, LDAPCreate, LDAPUpdate, LDAPSearch, LDAPDelete,
    LDAPRetrieve, LDAPAddAttribute, LDAPModAttribute, LDAPRemoveAttribute,
    LDAPAddMember, LDAPRemoveMember,
    LDAPAddAttributeViaOption, LDAPRemoveAttributeViaOption,
    add_missing_object_class)
from ipaserver.plugins.service import (validate_realm, normalize_principal)
from ipalib.request import context
from ipalib import _
from ipalib.constants import PATTERN_GROUPUSER_NAME
from ipapython import kerberos
from ipapython.ipautil import ipa_generate_password, TMP_PWD_ENTROPY_BITS
from ipapython.ipavalidate import Email
from ipalib.util import (
    normalize_sshpubkey,
    validate_sshpubkey,
    convert_sshpubkey_post,
    remove_sshpubkey_from_output_post,
    remove_sshpubkey_from_output_list_post,
    add_sshpubkey_to_attrs_pre,
    set_krbcanonicalname,
    check_principal_realm_in_trust_namespace,
    ensure_last_krbprincipalname,
    ensure_krbcanonicalname_set
)

if six.PY3:
    unicode = str

__doc__ = _("""
Baseuser

This contains common definitions for user/stageuser
""")

register = Registry()

NO_UPG_MAGIC = '__no_upg__'

baseuser_output_params = (
    Flag('has_keytab',
        label=_('Kerberos keys available'),
    ),
   )

UPG_DEFINITION_DN = DN(('cn', 'UPG Definition'),
                       ('cn', 'Definitions'),
                       ('cn', 'Managed Entries'),
                       ('cn', 'etc'),
                       api.env.basedn)


def validate_nsaccountlock(entry_attrs):
    if 'nsaccountlock' in entry_attrs:
        nsaccountlock = entry_attrs['nsaccountlock']
        if not isinstance(nsaccountlock, (bool, Bool)):
            if not isinstance(nsaccountlock, six.string_types):
                raise errors.OnlyOneValueAllowed(attr='nsaccountlock')
            if nsaccountlock.lower() not in ('true', 'false'):
                raise errors.ValidationError(name='nsaccountlock',
                    error=_('must be TRUE or FALSE'))

def radius_dn2pk(api, entry_attrs):
    cl = entry_attrs.get('ipatokenradiusconfiglink', None)
    if cl:
        pk = api.Object['radiusproxy'].get_primary_key_from_dn(cl[0])
        entry_attrs['ipatokenradiusconfiglink'] = [pk]

def convert_nsaccountlock(entry_attrs):
    if not 'nsaccountlock' in entry_attrs:
        entry_attrs['nsaccountlock'] = False
    else:
        nsaccountlock = Bool('temp')
        entry_attrs['nsaccountlock'] = nsaccountlock.convert(entry_attrs['nsaccountlock'][0])


def normalize_user_principal(value):
    principal = kerberos.Principal(normalize_principal(value))
    lowercase_components = ((principal.username.lower(),) +
                            principal.components[1:])

    return unicode(
        kerberos.Principal(lowercase_components, realm=principal.realm))


def fix_addressbook_permission_bindrule(name, template, is_new,
                                        anonymous_read_aci,
                                        **other_options):
    """Fix bind rule type for Read User Addressbook/IPA Attributes permission

    When upgrading from an old IPA that had the global read ACI,
    or when installing the first replica with granular read permissions,
    we need to keep allowing anonymous access to many user attributes.
    This fixup_function changes the bind rule type accordingly.
    """
    if is_new and anonymous_read_aci:
        template['ipapermbindruletype'] = 'anonymous'



class baseuser(LDAPObject):
    """
    baseuser object.
    """

    stage_container_dn        = api.env.container_stageuser
    active_container_dn       = api.env.container_user
    delete_container_dn       = api.env.container_deleteuser
    object_class = ['posixaccount']
    object_class_config = 'ipauserobjectclasses'
    possible_objectclasses = [
        'meporiginentry', 'ipauserauthtypeclass', 'ipauser',
        'ipatokenradiusproxyuser', 'ipacertmapobject'
    ]
    disallow_object_classes = ['krbticketpolicyaux']
    permission_filter_objectclasses = ['posixaccount']
    search_attributes_config = 'ipausersearchfields'
    default_attributes = [
        'uid', 'givenname', 'sn', 'homedirectory', 'loginshell',
        'uidnumber', 'gidnumber', 'mail', 'ou',
        'telephonenumber', 'title', 'memberof', 'nsaccountlock',
        'memberofindirect', 'ipauserauthtype', 'userclass',
        'ipatokenradiusconfiglink', 'ipatokenradiususername',
        'krbprincipalexpiration', 'usercertificate;binary',
        'krbprincipalname', 'krbcanonicalname',
        'ipacertmapdata'
    ]
    search_display_attributes = [
        'uid', 'givenname', 'sn', 'homedirectory', 'krbcanonicalname',
        'krbprincipalname', 'loginshell',
        'mail', 'telephonenumber', 'title', 'nsaccountlock',
        'uidnumber', 'gidnumber', 'sshpubkeyfp',
    ]
    uuid_attribute = 'ipauniqueid'
    attribute_members = {
        'manager': ['user'],
        'memberof': ['group', 'netgroup', 'role', 'hbacrule', 'sudorule'],
        'memberofindirect': ['group', 'netgroup', 'role', 'hbacrule', 'sudorule'],
    }
    allow_rename = True
    bindable = True
    password_attributes = [('userpassword', 'has_password'),
                           ('krbprincipalkey', 'has_keytab')]
    label = _('Users')
    label_singular = _('User')

    takes_params = (
        Str('uid',
            pattern=PATTERN_GROUPUSER_NAME,
            pattern_errmsg='may only include letters, numbers, _, -, . and $',
            maxlength=255,
            cli_name='login',
            label=_('User login'),
            primary_key=True,
            default_from=lambda givenname, sn: givenname[0] + sn,
            normalizer=lambda value: value.lower(),
        ),
        Str('givenname',
            cli_name='first',
            label=_('First name'),
        ),
        Str('sn',
            cli_name='last',
            label=_('Last name'),
        ),
        Str('cn',
            label=_('Full name'),
            default_from=lambda givenname, sn: '%s %s' % (givenname, sn),
            autofill=True,
        ),
        Str('displayname?',
            label=_('Display name'),
            default_from=lambda givenname, sn: '%s %s' % (givenname, sn),
            autofill=True,
        ),
        Str('initials?',
            label=_('Initials'),
            default_from=lambda givenname, sn: '%c%c' % (givenname[0], sn[0]),
            autofill=True,
        ),
        Str('homedirectory?',
            cli_name='homedir',
            label=_('Home directory'),
        ),
        Str('gecos?',
            label=_('GECOS'),
            default_from=lambda givenname, sn: '%s %s' % (givenname, sn),
            autofill=True,
        ),
        Str('loginshell?',
            cli_name='shell',
            label=_('Login shell'),
        ),
        Principal(
            'krbcanonicalname?',
            validate_realm,
            label=_('Principal name'),
            flags={'no_option', 'no_create', 'no_update', 'no_search'},
            normalizer=normalize_user_principal
        ),
        Principal(
            'krbprincipalname*',
            validate_realm,
            cli_name='principal',
            label=_('Principal alias'),
            default_from=lambda uid: kerberos.Principal(
                uid.lower(), realm=api.env.realm),
            autofill=True,
            normalizer=normalize_user_principal,
        ),
        DateTime('krbprincipalexpiration?',
            cli_name='principal_expiration',
            label=_('Kerberos principal expiration'),
        ),
        DateTime('krbpasswordexpiration?',
            cli_name='password_expiration',
            label=_('User password expiration'),
        ),
        Str('mail*',
            cli_name='email',
            label=_('Email address'),
        ),
        Password('userpassword?',
            cli_name='password',
            label=_('Password'),
            doc=_('Prompt to set the user password'),
            # FIXME: This is temporary till bug is fixed causing updates to
            # bomb out via the webUI.
            exclude='webui',
        ),
        Flag('random?',
            doc=_('Generate a random user password'),
            flags=('no_search', 'virtual_attribute'),
            default=False,
        ),
        Str('randompassword?',
            label=_('Random password'),
            flags=('no_create', 'no_update', 'no_search', 'virtual_attribute'),
        ),
        Int('uidnumber?',
            cli_name='uid',
            label=_('UID'),
            doc=_('User ID Number (system will assign one if not provided)'),
            minvalue=1,
        ),
        Int('gidnumber?',
            label=_('GID'),
            doc=_('Group ID Number'),
            minvalue=1,
        ),
        Str('street?',
            cli_name='street',
            label=_('Street address'),
        ),
        Str('l?',
            cli_name='city',
            label=_('City'),
        ),
        Str('st?',
            cli_name='state',
            label=_('State/Province'),
        ),
        Str('postalcode?',
            label=_('ZIP'),
        ),
        Str('telephonenumber*',
            cli_name='phone',
            label=_('Telephone Number')
        ),
        Str('mobile*',
            label=_('Mobile Telephone Number')
        ),
        Str('pager*',
            label=_('Pager Number')
        ),
        Str('facsimiletelephonenumber*',
            cli_name='fax',
            label=_('Fax Number'),
        ),
        Str('ou?',
            cli_name='orgunit',
            label=_('Org. Unit'),
        ),
        Str('title?',
            label=_('Job Title'),
        ),
        # keep backward compatibility using single value manager option
        Str('manager?',
            label=_('Manager'),
        ),
        Str('carlicense*',
            label=_('Car License'),
        ),
        Str('ipasshpubkey*', validate_sshpubkey,
            cli_name='sshpubkey',
            label=_('SSH public key'),
            normalizer=normalize_sshpubkey,
            flags=['no_search'],
        ),
        Str('sshpubkeyfp*',
            label=_('SSH public key fingerprint'),
            flags={'virtual_attribute', 'no_create', 'no_update', 'no_search'},
        ),
        StrEnum('ipauserauthtype*',
            cli_name='user_auth_type',
            label=_('User authentication types'),
            doc=_('Types of supported user authentication'),
            values=(u'password', u'radius', u'otp'),
        ),
        Str('userclass*',
            cli_name='class',
            label=_('Class'),
            doc=_('User category (semantics placed on this attribute are for '
                  'local interpretation)'),
        ),
        Str('ipatokenradiusconfiglink?',
            cli_name='radius',
            label=_('RADIUS proxy configuration'),
        ),
        Str('ipatokenradiususername?',
            cli_name='radius_username',
            label=_('RADIUS proxy username'),
        ),
        Str('departmentnumber*',
            label=_('Department Number'),
        ),
        Str('employeenumber?',
            label=_('Employee Number'),
        ),
        Str('employeetype?',
            label=_('Employee Type'),
        ),
        Str('preferredlanguage?',
            label=_('Preferred Language'),
            pattern='^(([a-zA-Z]{1,8}(-[a-zA-Z]{1,8})?(;q\=((0(\.[0-9]{0,3})?)|(1(\.0{0,3})?)))?' \
             + '(\s*,\s*[a-zA-Z]{1,8}(-[a-zA-Z]{1,8})?(;q\=((0(\.[0-9]{0,3})?)|(1(\.0{0,3})?)))?)*)|(\*))$',
            pattern_errmsg='must match RFC 2068 - 14.4, e.g., "da, en-gb;q=0.8, en;q=0.7"',
        ),
        Certificate('usercertificate*',
            cli_name='certificate',
            label=_('Certificate'),
            doc=_('Base-64 encoded user certificate'),
        ),
        Str(
            'ipacertmapdata*',
            cli_name='certmapdata',
            label=_('Certificate mapping data'),
            doc=_('Certificate mapping data'),
            flags=['no_create', 'no_update', 'no_search'],
        ),
    )

    def normalize_and_validate_email(self, email, config=None):
        if not config:
            config = self.backend.get_ipa_config()

        # check if default email domain should be added
        defaultdomain = config.get('ipadefaultemaildomain', [None])[0]
        if email:
            norm_email = []
            if not isinstance(email, (list, tuple)):
                email = [email]
            for m in email:
                if isinstance(m, six.string_types):
                    if '@' not in m and defaultdomain:
                        m = m + u'@' + defaultdomain
                    if not Email(m):
                        raise errors.ValidationError(name='email', error=_('invalid e-mail format: %(email)s') % dict(email=m))
                    norm_email.append(m)
                else:
                    if not Email(m):
                        raise errors.ValidationError(name='email', error=_('invalid e-mail format: %(email)s') % dict(email=m))
                    norm_email.append(m)
            return norm_email

        return email

    def normalize_manager(self, manager, container):
        """
        Given a userid verify the user's existence (in the appropriate containter) and return the dn.
        """
        if not manager:
            return None

        if not isinstance(manager, list):
            manager = [manager]

        try:
            container_dn = DN(container, api.env.basedn)
            for i, mgr in enumerate(manager):
                if isinstance(mgr, DN) and mgr.endswith(container_dn):
                    continue
                entry_attrs = self.backend.find_entry_by_attr(
                        self.primary_key.name, mgr, self.object_class, [''],
                        container_dn
                    )
                manager[i] = entry_attrs.dn
        except errors.NotFound:
            raise errors.NotFound(reason=_('manager %(manager)s not found') % dict(manager=mgr))

        return manager

    def _user_status(self, user, container):
        assert isinstance(user, DN)
        return user.endswith(container)

    def active_user(self, user):
        assert isinstance(user, DN)
        return self._user_status(user, DN(self.active_container_dn, api.env.basedn))

    def stage_user(self, user):
        assert isinstance(user, DN)
        return self._user_status(user, DN(self.stage_container_dn, api.env.basedn))

    def delete_user(self, user):
        assert isinstance(user, DN)
        return self._user_status(user, DN(self.delete_container_dn, api.env.basedn))

    def convert_usercertificate_pre(self, entry_attrs):
        if 'usercertificate' in entry_attrs:
            entry_attrs['usercertificate;binary'] = entry_attrs.pop(
                'usercertificate')

    def convert_usercertificate_post(self, entry_attrs, **options):
        if 'usercertificate;binary' in entry_attrs:
            entry_attrs['usercertificate'] = entry_attrs.pop(
                'usercertificate;binary')

    def convert_attribute_members(self, entry_attrs, *keys, **options):
        super(baseuser, self).convert_attribute_members(
            entry_attrs, *keys, **options)

        if options.get("raw", False):
            return

        # due the backward compatibility, managers have to be returned in
        # 'manager' attribute instead of 'manager_user'
        try:
            entry_attrs['failed_manager'] = entry_attrs.pop('manager')
        except KeyError:
            pass

        try:
            entry_attrs['manager'] = entry_attrs.pop('manager_user')
        except KeyError:
            pass


class baseuser_add(LDAPCreate):
    """
    Prototype command plugin to be implemented by real plugin
    """
    def pre_common_callback(self, ldap, dn, entry_attrs, attrs_list, *keys,
                            **options):
        assert isinstance(dn, DN)
        set_krbcanonicalname(entry_attrs)
        self.obj.convert_usercertificate_pre(entry_attrs)

    def post_common_callback(self, ldap, dn, entry_attrs, *keys, **options):
        assert isinstance(dn, DN)
        self.obj.convert_usercertificate_post(entry_attrs, **options)
        self.obj.get_password_attributes(ldap, dn, entry_attrs)
        convert_sshpubkey_post(entry_attrs)
        radius_dn2pk(self.api, entry_attrs)

class baseuser_del(LDAPDelete):
    """
    Prototype command plugin to be implemented by real plugin
    """

class baseuser_mod(LDAPUpdate):
    """
    Prototype command plugin to be implemented by real plugin
    """
    def check_namelength(self, ldap, **options):
        if options.get('rename') is not None:
            config = ldap.get_ipa_config()
            if 'ipamaxusernamelength' in config:
                if len(options['rename']) > int(config.get('ipamaxusernamelength')[0]):
                    raise errors.ValidationError(
                        name=self.obj.primary_key.cli_name,
                        error=_('can be at most %(len)d characters') % dict(
                            len = int(config.get('ipamaxusernamelength')[0])
                        )
                    )

    def preserve_krbprincipalname_pre(self, ldap, entry_attrs, *keys, **options):
        """
        preserve user principal aliases during rename operation. This is the
        pre-callback part of this. Another method called during post-callback
        shall insert the principals back
        """
        if options.get('rename', None) is None:
            return

        try:
            old_entry = ldap.get_entry(
                entry_attrs.dn, attrs_list=(
                    'krbprincipalname', 'krbcanonicalname'))

            if 'krbcanonicalname' not in old_entry:
                return
        except errors.NotFound:
            raise self.obj.handle_not_found(*keys)

        self.context.krbprincipalname = old_entry.get(
            'krbprincipalname', [])

    def preserve_krbprincipalname_post(self, ldap, entry_attrs, **options):
        """
        Insert the preserved aliases back to the user entry during rename
        operation
        """
        if options.get('rename', None) is None or not hasattr(
                self.context, 'krbprincipalname'):
            return

        obj_pkey = self.obj.get_primary_key_from_dn(entry_attrs.dn)
        canonical_name = entry_attrs['krbcanonicalname'][0]

        principals_to_add = tuple(p for p in self.context.krbprincipalname if
                                  p != canonical_name)

        if principals_to_add:
            result = self.api.Command.user_add_principal(
                obj_pkey, principals_to_add)['result']

            entry_attrs['krbprincipalname'] = result.get('krbprincipalname', [])

    def check_mail(self, entry_attrs):
        if 'mail' in entry_attrs:
            entry_attrs['mail'] = self.obj.normalize_and_validate_email(entry_attrs['mail'])

    def check_manager(self, entry_attrs, container):
        if 'manager' in entry_attrs:
            entry_attrs['manager'] = self.obj.normalize_manager(entry_attrs['manager'], container)

    def check_userpassword(self, entry_attrs, **options):
        if 'userpassword' not in entry_attrs and options.get('random'):
            entry_attrs['userpassword'] = ipa_generate_password(
                entropy_bits=TMP_PWD_ENTROPY_BITS)
            # save the password so it can be displayed in post_callback
            setattr(context, 'randompassword', entry_attrs['userpassword'])

    def check_objectclass(self, ldap, dn, entry_attrs):
        if ('ipasshpubkey' in entry_attrs or 'ipauserauthtype' in entry_attrs
            or 'userclass' in entry_attrs or 'ipatokenradiusconfiglink' in entry_attrs):
            if 'objectclass' in entry_attrs:
                obj_classes = entry_attrs['objectclass']
            else:
                _entry_attrs = ldap.get_entry(dn, ['objectclass'])
                obj_classes = entry_attrs['objectclass'] = _entry_attrs['objectclass']

            # IMPORTANT: compare objectclasses as case insensitive
            obj_classes = [o.lower() for o in obj_classes]

            if 'ipasshpubkey' in entry_attrs and 'ipasshuser' not in obj_classes:
                entry_attrs['objectclass'].append('ipasshuser')

            if 'ipauserauthtype' in entry_attrs and 'ipauserauthtypeclass' not in obj_classes:
                entry_attrs['objectclass'].append('ipauserauthtypeclass')

            if 'userclass' in entry_attrs and 'ipauser' not in obj_classes:
                entry_attrs['objectclass'].append('ipauser')

            if 'ipatokenradiusconfiglink' in entry_attrs:
                cl = entry_attrs['ipatokenradiusconfiglink']
                if cl:
                    if 'ipatokenradiusproxyuser' not in obj_classes:
                        entry_attrs['objectclass'].append('ipatokenradiusproxyuser')

                    answer = self.api.Object['radiusproxy'].get_dn_if_exists(cl)
                    entry_attrs['ipatokenradiusconfiglink'] = answer

    def pre_common_callback(self, ldap, dn, entry_attrs, attrs_list, *keys,
                            **options):
        assert isinstance(dn, DN)
        add_sshpubkey_to_attrs_pre(self.context, attrs_list)

        self.check_namelength(ldap, **options)

        self.check_mail(entry_attrs)

        self.check_manager(entry_attrs, self.obj.active_container_dn)

        self.check_userpassword(entry_attrs, **options)

        self.check_objectclass(ldap, dn, entry_attrs)
        self.obj.convert_usercertificate_pre(entry_attrs)
        self.preserve_krbprincipalname_pre(ldap, entry_attrs, *keys, **options)

    def post_common_callback(self, ldap, dn, entry_attrs, *keys, **options):
        assert isinstance(dn, DN)
        self.preserve_krbprincipalname_post(ldap, entry_attrs, **options)
        if options.get('random', False):
            try:
                entry_attrs['randompassword'] = unicode(getattr(context, 'randompassword'))
            except AttributeError:
                # if both randompassword and userpassword options were used
                pass
        convert_nsaccountlock(entry_attrs)
        self.obj.get_password_attributes(ldap, dn, entry_attrs)
        self.obj.convert_usercertificate_post(entry_attrs, **options)
        convert_sshpubkey_post(entry_attrs)
        remove_sshpubkey_from_output_post(self.context, entry_attrs)
        radius_dn2pk(self.api, entry_attrs)

class baseuser_find(LDAPSearch):
    """
    Prototype command plugin to be implemented by real plugin
    """
    def args_options_2_entry(self, *args, **options):
        newoptions = {}
        self.common_enhance_options(newoptions, **options)
        options.update(newoptions)

        return super(baseuser_find, self).args_options_2_entry(
            *args, **options)

    def common_enhance_options(self, newoptions, **options):
        # assure the manager attr is a dn, not just a bare uid
        manager = options.get('manager')
        if manager is not None:
            newoptions['manager'] = self.obj.normalize_manager(manager, self.obj.active_container_dn)

        # Ensure that the RADIUS config link is a dn, not just the name
        cl = 'ipatokenradiusconfiglink'
        if cl in options:
            newoptions[cl] = self.api.Object['radiusproxy'].get_dn(options[cl])

    def pre_common_callback(self, ldap, filters, attrs_list, base_dn, scope,
                            *args, **options):
        add_sshpubkey_to_attrs_pre(self.context, attrs_list)

    def post_common_callback(self, ldap, entries, lockout=False, **options):
        for attrs in entries:
            self.obj.convert_usercertificate_post(attrs, **options)
            if (lockout):
                attrs['nsaccountlock'] = True
            else:
                convert_nsaccountlock(attrs)
            convert_sshpubkey_post(attrs)
        remove_sshpubkey_from_output_list_post(self.context, entries)

class baseuser_show(LDAPRetrieve):
    """
    Prototype command plugin to be implemented by real plugin
    """
    def pre_common_callback(self, ldap, dn, attrs_list, *keys, **options):
        assert isinstance(dn, DN)
        add_sshpubkey_to_attrs_pre(self.context, attrs_list)

    def post_common_callback(self, ldap, dn, entry_attrs, *keys, **options):
        assert isinstance(dn, DN)
        self.obj.get_password_attributes(ldap, dn, entry_attrs)
        self.obj.convert_usercertificate_post(entry_attrs, **options)
        convert_sshpubkey_post(entry_attrs)
        remove_sshpubkey_from_output_post(self.context, entry_attrs)
        radius_dn2pk(self.api, entry_attrs)


class baseuser_add_manager(LDAPAddMember):
    member_attributes = ['manager']


class baseuser_remove_manager(LDAPRemoveMember):
    member_attributes = ['manager']


class baseuser_add_principal(LDAPAddAttribute):
    attribute = 'krbprincipalname'

    def pre_callback(self, ldap, dn, entry_attrs, attrs_list, *keys, **options):
        check_principal_realm_in_trust_namespace(self.api, *keys)
        ensure_krbcanonicalname_set(ldap, entry_attrs)
        return dn


class baseuser_remove_principal(LDAPRemoveAttribute):
    attribute = 'krbprincipalname'

    def pre_callback(self, ldap, dn, entry_attrs, attrs_list, *keys, **options):
        ensure_last_krbprincipalname(ldap, entry_attrs, *keys)
        return dn


class baseuser_add_cert(LDAPAddAttributeViaOption):
    attribute = 'usercertificate'

    def pre_callback(self, ldap, dn, entry_attrs, attrs_list, *keys,
                     **options):
        self.obj.convert_usercertificate_pre(entry_attrs)

        return dn

    def post_callback(self, ldap, dn, entry_attrs, *keys, **options):
        assert isinstance(dn, DN)

        self.obj.convert_usercertificate_post(entry_attrs, **options)

        return dn


class baseuser_remove_cert(LDAPRemoveAttributeViaOption):
    attribute = 'usercertificate'

    def pre_callback(self, ldap, dn, entry_attrs, attrs_list, *keys,
                     **options):
        self.obj.convert_usercertificate_pre(entry_attrs)

        return dn

    def post_callback(self, ldap, dn, entry_attrs, *keys, **options):
        assert isinstance(dn, DN)

        self.obj.convert_usercertificate_post(entry_attrs, **options)

        return dn


class ModCertMapData(LDAPModAttribute):
    attribute = 'ipacertmapdata'
    takes_options = (
        DNParam(
            'issuer?',
            cli_name='issuer',
            label=_('Issuer'),
            doc=_('Issuer of the certificate'),
            flags=['virtual_attribute']
        ),
        DNParam(
            'subject?',
            cli_name='subject',
            label=_('Subject'),
            doc=_('Subject of the certificate'),
            flags=['virtual_attribute']
        ),
        Certificate(
            'certificate*',
            cli_name='certificate',
            label=_('Certificate'),
            doc=_('Base-64 encoded user certificate'),
            flags=['virtual_attribute']
        ),
    )

    @staticmethod
    def _build_mapdata(subject, issuer):
        return u'X509:<I>{issuer}<S>{subject}'.format(
            issuer=issuer.x500_text(), subject=subject.x500_text())

    @classmethod
    def _convert_options_to_certmap(cls, entry_attrs, issuer=None,
                                    subject=None, certificates=()):
        """
        Converts options to ipacertmapdata

        When --subject --issuer or --certificate options are used,
        the value for ipacertmapdata is built from extracting subject and
        issuer,
        converting their values to X500 ordering and using the format
        X509:<I>issuer<S>subject
        For instance:
        X509:<I>O=DOMAIN,CN=Certificate Authority<S>O=DOMAIN,CN=user
        A list of values can be returned if --certificate is used multiple
        times, or in conjunction with --subject --issuer.
        """
        data = []
        data.extend(entry_attrs.get(cls.attribute, list()))

        if issuer or subject:
            data.append(cls._build_mapdata(subject, issuer))

        for cert in certificates:
            issuer = DN(cert.issuer)
            subject = DN(cert.subject)
            if not subject:
                raise errors.ValidationError(
                    name='certificate',
                    error=_('cannot have an empty subject'))
            data.append(cls._build_mapdata(subject, issuer))

        entry_attrs[cls.attribute] = data

    def get_args(self):
        # ipacertmapdata is not mandatory as it can be built
        # from the values subject+issuer or from reading certificate
        for arg in super(ModCertMapData, self).get_args():
            if arg.name == 'ipacertmapdata':
                yield arg.clone(required=False, alwaysask=False)
            else:
                yield arg.clone()

    def pre_callback(self, ldap, dn, entry_attrs, attrs_list, *keys,
                     **options):
        # The 3 valid calls are
        # ipa user-add-certmapdata LOGIN --subject xx --issuer yy
        # ipa user-add-certmapdata LOGIN [DATA] --certificate xx
        # ipa user-add-certmapdata LOGIN DATA
        # Check that at least one of the 3 formats is used

        try:
            certmapdatas = keys[1] or []
        except IndexError:
            certmapdatas = []
        issuer = options.get('issuer')
        subject = options.get('subject')
        certificates = options.get('certificate', [])

        # If only LOGIN is supplied, then we need either subject or issuer or
        # certificate
        if (not certmapdatas and not issuer and not subject and
                not certificates):
            raise errors.RequirementError(name='ipacertmapdata')

        # If subject or issuer is provided, other options are not allowed
        if subject or issuer:
            if certificates:
                raise errors.MutuallyExclusiveError(
                    reason=_('cannot specify both subject/issuer '
                             'and certificate'))
            if certmapdatas:
                raise errors.MutuallyExclusiveError(
                    reason=_('cannot specify both subject/issuer '
                             'and ipacertmapdata'))
            # If subject or issuer is provided, then the other one is required
            if not subject:
                raise errors.RequirementError(name='subject')
            if not issuer:
                raise errors.RequirementError(name='issuer')

        # if the command is called with --subject --issuer or --certificate
        # we need to add ipacertmapdata to the attrs_list in order to
        # display the resulting value in the command output
        if 'ipacertmapdata' not in attrs_list:
            attrs_list.append('ipacertmapdata')

        self._convert_options_to_certmap(
            entry_attrs,
            issuer=issuer,
            subject=subject,
            certificates=certificates)

        return dn


class baseuser_add_certmapdata(ModCertMapData, LDAPAddAttribute):
    __doc__ = _("Add one or more certificate mappings to the user entry.")
    msg_summary = _('Added certificate mappings to user "%(value)s"')

    def pre_callback(self, ldap, dn, entry_attrs, attrs_list, *keys,
                     **options):

        dn = super(baseuser_add_certmapdata, self).pre_callback(
            ldap, dn, entry_attrs, attrs_list, *keys, **options)

        # The objectclass ipacertmapobject may not be present on
        # existing user entries. We need to add it if we define a new
        # value for ipacertmapdata
        add_missing_object_class(ldap, u'ipacertmapobject', dn)

        return dn


class baseuser_remove_certmapdata(ModCertMapData,
                                  LDAPRemoveAttribute):
    __doc__ = _("Remove one or more certificate mappings from the user entry.")
    msg_summary = _('Removed certificate mappings from user "%(value)s"')
