/usr/share/pyshared/zope/component/hooks.py is in python-zope.component 3.10.0-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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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.
#
##############################################################################
"""Hooks for getting and setting a site in the thread global namespace.
"""
__docformat__ = 'restructuredtext'
import threading
import zope.component
try:
import zope.security.proxy
except ImportError:
SECURITY_SUPPORT = False
else:
SECURITY_SUPPORT = True
class read_property(object):
def __init__(self, func):
self.func = func
def __get__(self, inst, cls):
if inst is None:
return self
return self.func(inst)
class SiteInfo(threading.local):
site = None
sm = zope.component.getGlobalSiteManager()
def adapter_hook(self):
adapter_hook = self.sm.adapters.adapter_hook
self.adapter_hook = adapter_hook
return adapter_hook
adapter_hook = read_property(adapter_hook)
siteinfo = SiteInfo()
def setSite(site=None):
if site is None:
sm = zope.component.getGlobalSiteManager()
else:
# We remove the security proxy because there's no way for
# untrusted code to get at it without it being proxied again.
# We should really look look at this again though, especially
# once site managers do less. There's probably no good reason why
# they can't be proxied. Well, except maybe for performance.
if SECURITY_SUPPORT:
site = zope.security.proxy.removeSecurityProxy(site)
# The getSiteManager method is defined by IPossibleSite.
sm = site.getSiteManager()
siteinfo.site = site
siteinfo.sm = sm
try:
del siteinfo.adapter_hook
except AttributeError:
pass
def getSite():
return siteinfo.site
def getSiteManager(context=None):
"""A special hook for getting the site manager.
Here we take the currently set site into account to find the appropriate
site manager.
"""
if context is None:
return siteinfo.sm
# We remove the security proxy because there's no way for
# untrusted code to get at it without it being proxied again.
# We should really look look at this again though, especially
# once site managers do less. There's probably no good reason why
# they can't be proxied. Well, except maybe for performance.
sm = zope.component.interfaces.IComponentLookup(
context, zope.component.getGlobalSiteManager())
if SECURITY_SUPPORT:
sm = zope.security.proxy.removeSecurityProxy(sm)
return sm
def adapter_hook(interface, object, name='', default=None):
try:
return siteinfo.adapter_hook(interface, object, name, default)
except zope.component.interfaces.ComponentLookupError:
return default
def setHooks():
zope.component.adapter_hook.sethook(adapter_hook)
zope.component.getSiteManager.sethook(getSiteManager)
def resetHooks():
# Reset hookable functions to original implementation.
zope.component.adapter_hook.reset()
zope.component.getSiteManager.reset()
# Clear the site thread global
clearSite = setSite
try:
from zope.testing.cleanup import addCleanUp
except ImportError:
pass
else:
addCleanUp(resetHooks)
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