[Zope] using getProperty and catching Unauthorized

[Casey Duncan]

After a closer look, it would seem that nearly all of the 'Unauthorized'
string exceptions have been replaced with a bonified exception object. So
that is probably why it doesn't work.

You could try importing this class in the python script using::

  from zExeptions import Unauthorized

and catch exceptions of this class. I have a feeling this import is not
possible fom a python script however (though it probably should be). So that
leaves you little choice but to either use a bare except, or write the code
in an external method or other trusted code module.

-Casey

----- Original Message -----
From: "John K. Hohm" <jhohm@acm.org>
To: "Casey Duncan" <casey@zope.com>
Cc: "Dieter Maurer" <dieter@handshake.de>; <zope@zope.org>
Sent: Saturday, October 26, 2002 12:40 PM
Subject: Re: [Zope] using getProperty and catching Unauthorized


> Quoting Casey Duncan <casey@zope.com>:
> > Yes, but as of right now, Python strings that do not contain spaces are
> > interned as the same object. So as long as the name does not have a
space in
> > it, it should work.
>
> Thanks all, for the responses.  Perhaps it should work, but it doesn't.  I
get
> the Unauthorized exception in my browser even though I'm doing this:
>
>     try:
>         menu_order = sibling.getProperty('menu_order', None)
>     except 'Unauthorized': continue
>
> I somehow got the impression from reading the Python manual that raising
an
> exception with a string that is the name of a class will raise the class
> instead, so I tried doing this:
>
> from AccessControl import Unauthorized
> #...
>     try:
>         menu_order = sibling.getProperty('menu_order', None)
>     except Unauthorized: continue
>
> But then I get this incredibly ironic error in the browser:
> Error Type: ImportError
> Error Value: import of "Unauthorized" from "AccessControl" is
unauthorized. You
> are not allowed to access Unauthorized in this context
>
> So apparently I'm allowed to call things that throw Unauthorized, but I'm
not
> allowed to import Unauthorized in order to catch it?  Harsh.  Is there
some
> other way of going about this?  Perhaps some function that simulates the
access
> control check that happens inside the acquisition wrapper, and returns a
> booleanish result?
>
> > That said, string exceptions suck rocks. But string exceptions with
spaces
> > suck gravel ;^)
> >
> > -Casey
> >
> > On Fri, 25 Oct 2002 21:37:53 +0200
> > Dieter Maurer <dieter@handshake.de> wrote:
> >
> > > Casey Duncan writes:
> > >  > I think the following should do what you want:
> > >  >
> > >  > for foo in bar.objectvalues()
> > >  >     try:
> > >  >         mo = foo.getProperty('menu_order', None)
> > >  >     except 'Unauthorized':
> > >  >         continue
> > >  >     ..do stuff..
> > > It may not work, because Python uses "is" to check against string
> > > exceptions and not "==".
> > >
> > >
> > > Dieter
>