Open Stack

Hello everybody

Where can I find complete docs about managing and architecture of 
managing users in OpenStack Swift?
I know there is a tool called 'st' that does some basic users 
operations, however I need to create a little bit more extended system 
where users should be able to register themselves automatically and more 
priviledge levels should be added, (or probably groups).
I have seen some "Extending swauth" chapters, but still cannot figure 
out how should be done, and where my code should be added. Are there any 
complete solutions or examples showing how to extend registration and 
authorization functionalities?

Thanks in advance.

M.