[Zope-CMF] Access problem.

[Ignacio Dosil Lago]

-- I am developing a CMF "link" product which defines its own traverse method:

  def __bobo_traverse__(self, request, name=None):
    "Traverse method hook"
    
    if hasattr(self, name):
      # return own attributes/subobjects
      return getattr(self, name)
    else:
      t= self.getTarget()
      if hasattr(t, name):
        # return target's attributes/subobjects
        return getattr(t, name)
      else:
        return t

-- It works fine under the ZMI but when I try to access an object of this 
product into a CMF portal using the CMF interface, Zope requests me login 
name and password (even if I am admin!!), which it doesn't accept, so the 
only way to continue is to cancel instead of triying to log in. Once I click 
on the cancel button Zope throws the following error:

Site Error

An error was encountered while publishing this resource.

Unauthorized
Sorry, a site error occurred.

Traceback (innermost last):
  File /home/Zope/Zope-2.5.1-linux2-x86/lib/python/ZPublisher/Publish.py, line 
150, in publish_module
  File 
/home/Zope/Zope-2.5.1-linux2-x86/lib/python/Products/Localizer/__init__.py, 
line 65, in new_publish
  File /home/Zope/Zope-2.5.1-linux2-x86/lib/python/ZPublisher/Publish.py, line 
114, in publish
  File /home/Zope/Zope-2.5.1-linux2-x86/lib/python/Zope/__init__.py, line 159, 
in zpublisher_exception_hook
    (Object: Link)
  File /home/Zope/Zope-2.5.1-linux2-x86/lib/python/ZPublisher/Publish.py, line 
98, in publish
  File /home/Zope/Zope-2.5.1-linux2-x86/lib/python/ZPublisher/mapply.py, line 
88, in mapply
    (Object: metadata_edit_form)
  File /home/Zope/Zope-2.5.1-linux2-x86/lib/python/ZPublisher/Publish.py, line 
39, in call_object
    (Object: metadata_edit_form)
  File 
/home/Zope/Zope-2.5.1-linux2-x86/lib/python/Shared/DC/Scripts/Bindings.py, 
line 252, in __call__
    (Object: metadata_edit_form)
  File 
/home/Zope/Zope-2.5.1-linux2-x86/lib/python/Shared/DC/Scripts/Bindings.py, 
line 283, in _bindAndExec
    (Object: metadata_edit_form)
  File 
/home/Zope/Zope-2.5.1-linux2-x86/lib/python/Products/PageTemplates/Expressions.py, 
line 186, in _eval
  File 
/home/Zope/Zope-2.5.1-linux2-x86/lib/python/Products/PageTemplates/Expressions.py, 
line 143, in _eval
    (Info: here)
  File 
/home/Zope/Zope-2.5.1-linux2-x86/lib/python/Products/PageTemplates/Expressions.py, 
line 339, in restrictedTraverse
    (Object: Link)
    (Info: {'path': ['portal_url'], 'TraversalRequestNameStack': []})
Unauthorized: You are not allowed to access portal_url in this context


-- I know 'portal_url' is a URLTool at the CMF portal root which my product 
acquires, so it's like an attribute of this object that Zope or CMF tries to 
access for some reason. I've also been tracing "restrictedTraverse" in 
Expressions.py but I couldn't see the information obtained as useful 
information.
Any suggestions/questions?

Kind regards.