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##############################################################################
#
# Copyright (c) 2005 Zope Foundation and Contributors.
# All Rights Reserved.
#
# This software is subject to the provisions of the Zope Public License,
# Version 2.1 (ZPL).  A copy of the ZPL should accompany this distribution.
# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
# FOR A PARTICULAR PURPOSE.
#
##############################################################################
"""Common definitions to avoid circular imports
"""
import threading

import zope.interface

from zope.security import interfaces


thread_local = threading.local()


@zope.interface.implementer(interfaces.ISystemPrincipal)
class SystemUser(object):
    id = u'zope.security.management.system_user'
    title = u'System'
    description = u''


system_user = SystemUser()