I currently finished work at the mod_privacy module for prosody!!
It’s far from being stable, but AFAI have tested it, it worked as I expect it to!
So have a look at: prosody-modules
or a direct link to mod_privacy.lua: here
Have a look at mod_adhoc and commands too! There is a “XEP-0133: Service Administration” implementation growing 
Have fun! prosody rocks!!
ciao Ephraim