[cells-devel] Hooks on Cells accesses?

[Kenny Tilton]

Frank Goenninger DG1SBG wrote:

> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> Dear Cells Users:
>
> Maybe you have come across this also ...
>
> While working on the other challenges I have been telling on this  
> list I am also trying to set-up an authorization model for Cells.
>
> I need to check permissions to Create, Update, Read, and Delete a  
> cell slot. I thought about having hooks on each of these operations  
> such that on every such operation within Cells an "outside function"  
> can be called. These just return t or nil depending on permission  
> check success or failure. As the model outside can be quite different  
> from case to case (app to app) I did not think about implementing  
> this within Cells.
>
> So
>
> (cells:add-hook 'cells:slot-read slot-reference 'my-permission-check- 
> function)
>
> would install that hook. 

I went ahead and made md-slot-value and its setter into generic 
functions. Not the end of the world performance-wise from brief analysis 
with ACLs profiler. More study necessary, but my guess is you really 
want more than this (such as making the hook specific to a slot, as per 
your add-hook semantics) and it would impact everyone, so I will await 
further input before exploring this further. Possibly you want a new 
defmodel slot option?

kt