Port mod_autobuddy.c from iChat

[Peter2121]

Apple added a module and a tool to manage auto-adding contacts to approved list:
https://opensource.apple.com/source/ChatServer/ChatServer-409/apple_patch/pre_configure/jabberd2/sm/mod_autobuddy.c.patch.auto.html
https://opensource.apple.com/source/ChatServer/ChatServer-263.1/jabber_autobuddy/

Is it possible to integrate this module and this tool to jabber2?

This function is present in ejabberd and OpenFire, it is really needed in corporate environment.
Maybe, another approach (modifying mod_roster_publish) could be more interesting?