[Zope] Re: Python Classes and Zope.

[Jean-Marc Orliaguet]

Dario Lopez-Kästen wrote:

> Florent Guillaume wrote:
>
>> Paul Winkler wrote:
>>
>>> On Fri, Dec 02, 2005 at 04:12:01PM +0100, Jean-Marc Orliaguet wrote:
>>>
>>>> does zope2 do an access control based on acquisition for public 
>>>> methods, that would be a waste of resources since the answer is 
>>>> always "yes, granted" ?
>>>
>>>
>>> Well, the thing is, the declaration that makes the method public
>>> *has no effect* unless your class participates in acquisition.
>>
>>
>>
>> That's not true. The objects of this class will be perfectly 
>> accessible to a restricted user:
>>
>>   from AccessControl import ClassSecurityInfo
>>   class MyStuff(object):
>>       security = ClassSecurityInfo()
>>       security.declareObjectPublic()
>>       security.setDefaultAccess('allow')
>>       def foo(self):
>>           return 'bar'
>>   InitializeClass(MyStuff)
>>
>
> In Zope 2.7.8 I get a segmentation fault when I try to do the above; I 
> also have the following code that manages this for any class (to avoid 
> having to do that for every single class):
>
> def _ZopifyClass(a_class):
>     a_class.security = ClassSecurityInfo()
>     a_class.security.declareObjectPublic() # Segmentation fault
>     security.setDefaultAccess('allow')
>     InitializeClass(a_class)
>
> I cannot swithc to Zope 2.8 because my code runs in PLone 2.05 and it 
> does not work with Zope 2.8.
>
> The segmentation fault occurs in the declareObjectPublic() statement.
>
> Is there a fix for the Zope 2.7 to this problem?
>
> Thanks.
>
> /dario



that's because it does not seem to work with new-style python classes in 
zope2.7

it works with:

class MyStuff:

   instead of:

class MyStuff(object):

This is what you would have got:

  File "/opt/Zope-2.7/lib/python/AccessControl/SecurityInfo.py", line 
165, in apply
    dict['%s__roles__' % name] = access
TypeError: object does not support item assignment

if you'd run it without the extra call.

now, the question is if it's worth the extra effort.

/JM