I'm running into a permissions puzzle, or perhaps zope bug.

I've got some code that generates breadcrumbs, working upward from an 
object into folders where my users may not have permissions. I expect to 
get Unauthorized exceptions, and trap them, but the exceptions generated 
aren't trapped by "except: Unauthorized". However, when I print the 
traceback manually, it seems it is in fact an Unauthorized error. (And a 
user with a Manager role gets no errors, so it is ultimately a 
permissions issue.)

the code:
[...]

generates this in the log
[...]

but if I attempt to trap it with "except: Unauthorized", the 
Unauthorized error pops through to the browser, with nothing generated 
in the event.log.

You're resolving breadcrumbs in a fairly unusual way by using  
resolve_url.  Normally, one figures out breadcrumbs "backwards" from  
the current context by reaching up the aq_parent chain (with, perhaps,  
some inspection to see if the parent object sets the property  
is_principia_folderish).

You might want to examine the Plone script "breadcrumbs.py" for some  
hints; it will be in CMFPlone/skins/plone_scripts/breadcrumbs.py


On Sep 20, 2005, at 10:10 AM, Christoph Berendes wrote:
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