def ProxyFactory(object, checker=None):
"""Factory function that creates a proxy for an object
The proxy checker is looked up if not provided.
"""
if type(object) is Proxy:
if checker is None or checker is getChecker(object):
return object
else:
# We have a proxy, but someone asked us to change its checker.
# Let's raise an exception.
#
# Other reasonable actions would be to either keep the existing
# proxy, or to create a new one with the given checker.
# The latter might be a security hole though, if untrusted code
# can call ProxyFactory.
raise TypeError("Tried to use ProxyFactory to change a Proxy's"
" checker.")
if checker is None:
checker = getattr(object, '__Security_checker__', None)
if checker is None:
checker = selectChecker(object)
if checker is None:
return object
return Proxy(object, checker)
def proxy(self, obj):
if isinstance(obj, Proxy):
return obj
# zope.security registered
checker = selectChecker(obj)
if checker is not None:
return Proxy(obj, checker)
return Proxy(obj, self)
def proxy(self, value):
'See IChecker'
if type(value) is Proxy:
return value
checker = getattr(value, '__Security_checker__', None)
if checker is None:
checker = selectChecker(value)
if checker is None:
return value
return Proxy(value, checker)