I'm trying to implement an IPermissionProvider on Trac 0.11 using TagsPlugin 0.6. My goal is to make it so that wiki resources given a simple tag (e.g. public) are visible to anonymous users.
This means that i'd like to call TagSystem.get_tags() from within check_permissions(). but get_tags() takes a req and a resource, and check_permissions() doesn't have access to a req.
coderanger suggested some stack hackery to find the req as a workaround. I did that, but even with that working, there is a recursion problem: the call to get_tags itself checks permissions on the object to get a list of the tags. This leads to infinite regress.
It might make more sense if get_tags took arguments of (perm, resource) instead, and if perm was optional. This way additional plugins could reason about the tags of a given resource without requiring that the user in question already have access to them.
