This is actually a bug in the tutorial.

The package's configure.zcml should have a directive like this:

<authtktauthenticationpolicy
     secret="sosecret"
     callback=".security.groupfinder"
     />

Currently it's missing the "callback" attribute.

- C


george hu wrote:
> Don't quite understand the following function, as described "The
> groupfinder defined here is an authorization policy “callback”; can't
> see it is called by which function. And it doesn't matter if I remove
> the function from the code.
> 
> def groupfinder(userid, request):
>     if userid in USERS:
>         return GROUPS.get(userid, [])
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