OK, so I think I understand your scenario now. A few comments.
* You don't necessarily have to plug in to the content provider filter
chain. It would certainly work, but the other approach would be to put some
code into global.asax to modify the current security context
(Thread.CurrentPrincipal) based on the authenticated user and what's in the
database. You'd just attach a bunch of roles to the user that would
correspond to the permissions from the NC database. Of course, you'd have to
have Allow and Deny statements in the topics themselves, which might get
unwieldy - that's going to depend on details of your application.
* Caching is currently disabled in the 2.0 bits. But even if it weren't, if
you go the route of injecting into the content provider filter chain, I'd
still suggest just hitting the database every time. Databases are faster
than most people think - you might not even notice the extra difference, and
if you can avoid having to get clever about optimization, you should.
* Assuming you *do* need to optimize, I'd suggest waiting until I get the
caching layer done. Because the filter chain looks like this:
NamespaceManager <-> Security <-> Caching <-> Property Parsing <-> Built-in
Topics <-> Physical Store
So what you could do would be to add a provider that injects custom
properties in between caching and property parsing, and they'd get cached
for free. Plus, at that point the model for properties is abstract rather
than lexical, so you wouldn't have to worry about syntax at all. You'd just
do something like AddProperty("name", "value").
* Thinking about it, we probably don't need the filter chain to be
dynamically pluggable. If you've got a custom build, you could just hardcode
your new provider(s) into the default chain, the way I do it for all the
providers now.
Anyway, those are some ideas.
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