[kronolith] configuring freebusy url

[Dominique LALOT]

Hello,

We have a large internal read-only ldap server for which I don't want to 
add freebusyurl information attributes. I don't want to extend the shema..

When adding new attendees, as soon as I type on the keyboard, I can see 
the result coming as emails (not logins uid)

I type a name (that should be a login for our use)
search ldap on cn=*name* ->   get cn,sn,givenname,mail,dn

I select an email, then save attendee, and I get "no freebusy url found" 
for  the email corresponding to the name

So, I need a hook to say: give me the email, I construct the freebusy 
URL for the default calendar of that person using our central ldap directory
mail -> uid -> FBURL

Is there already a way to do that?

Thanks

Dom