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##############################################################################
#
# Copyright (c) 2001, 2002 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.
#
##############################################################################
"""
Simple :class:`zope.security.interfaces.ISecurityPolicy` implementations.
As a reminder, ``ISecurityPolicy`` objects are factories for producing
:class:`zope.security.interfaces.IInteraction` objects. That means
that the classes themselves are implementations of
``ISecurityPolicy``.
"""
import zope.interface
from zope.security._definitions import system_user
from zope.security.checker import CheckerPublic
from zope.security.interfaces import IInteraction
from zope.security.interfaces import ISecurityPolicy
@zope.interface.implementer(IInteraction)
@zope.interface.provider(ISecurityPolicy)
class ParanoidSecurityPolicy:
"""
Prohibit all access by any non-system principal, unless the item
is :data:`public <zope.security.checker.CheckerPublic>`.
This means that if there are no participations (and hence no
principals), then access is allowed.
"""
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
@zope.interface.provider(ISecurityPolicy)
class PermissiveSecurityPolicy(ParanoidSecurityPolicy):
"""
Allow all access.
"""
def checkPermission(self, permission, object):
return True
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