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##############################################################################
#
# Copyright (c) 2001, 2002 Zope Corporation 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.
#
##############################################################################
"""Simple 'ISecurityPolicy' implementations.
$Id$
"""
import zope.interface
from zope.security.checker import CheckerPublic
from zope.security.interfaces import IInteraction, ISecurityPolicy
from zope.security._definitions import system_user
class ParanoidSecurityPolicy(object):
zope.interface.implements(IInteraction)
zope.interface.classProvides(ISecurityPolicy)
def __init__(self, *participations):
self.participations = []
for participation in participations:
self.add(participation)
def add(self, participation):
if participation.interaction is not None:
raise ValueError("%r already belongs to an interaction"
% participation)
participation.interaction = self
self.participations.append(participation)
def remove(self, participation):
if participation.interaction is not self:
raise ValueError("%r does not belong to this interaction"
% participation)
self.participations.remove(participation)
participation.interaction = None
def checkPermission(self, permission, object):
if permission is CheckerPublic:
return True
users = [p.principal
for p in self.participations
if p.principal is not system_user]
return not users
class PermissiveSecurityPolicy(ParanoidSecurityPolicy):
"""Allow all access."""
zope.interface.classProvides(ISecurityPolicy)
def checkPermission(self, permission, object):
return True
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