File: group.py

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# Copyright 2007 Google Inc.
#
# 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 2
# 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, write to the Free Software Foundation,
# Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
"""An implementation of a group map for nsscache.

GroupMap:  An implementation of NSS group maps based on the Map
class.

GroupMapEntry:  A group map entry based on the MapEntry class.
"""

__author__ = "vasilios@google.com (Vasilios Hoffman)"

from nss_cache.maps import maps


class GroupMap(maps.Map):
    """This class represents an NSS group map.

    Map data is stored as a list of MapEntry objects, see the abstract
    class Map.
    """

    def __init__(self, iterable=None):
        """Construct a GroupMap object using optional iterable."""
        super(GroupMap, self).__init__(iterable)

    def Add(self, entry):
        """Add a new object, verify it is a GroupMapEntry object."""
        if not isinstance(entry, GroupMapEntry):
            raise TypeError
        return super(GroupMap, self).Add(entry)


class GroupMapEntry(maps.MapEntry):
    """This class represents NSS group map entries."""

    # Using slots saves us over 2x memory on large maps.
    __slots__ = ("name", "passwd", "gid", "members", "groupmembers")
    _KEY = "name"
    _ATTRS = ("name", "passwd", "gid", "members", "groupmembers")

    def __init__(self, data=None):
        """Construct a GroupMapEntry, setting reasonable defaults."""
        self.name = None
        self.passwd = None
        self.gid = None
        self.members = None
        self.groupmembers = None

        super(GroupMapEntry, self).__init__(data)

        # Seed data with defaults if needed
        if self.passwd is None:
            self.passwd = "x"
        if self.members is None:
            self.members = []
        if self.groupmembers is None:
            self.groupmembers = []