Adressbook Sharing available by fruux - how is this going?

[christophdb]

Hi everybody,

as you probably all know www.fruux.com is the company behind the development of sabre/dav and evert was one of the founders of fruux. If you enter https://dav.fruux.com you can see that fruux uses "sabredav 3.1.0-alpha2".

Now my question is: with fruux it is possible to share addressbooks to other users - how do the do this?

For example fruux-user1 has an adressbook. The url of this adressbook is:
https://dav.fruux.com/addressbooks/a3298239815/bc0351a2-377b-4b3a-8195-cf5cc4560019/.
So "a3298239815" is the userid. "bc0351a2-377b-4b3a-8195-cf5cc4560019" is the adressbook-id.

If I share this with another fruux-user he/she can sync this adressbook with the url:
https://dav.fruux.com/addressbooks/a3298218094/9b986b55-1dc6-4377-9714-f1aa14b8e4a0/.
This leads me to the conclusion that his is not a delegation but it is a addressbook sharing feature. Right?

Now the question is: how does this work? In the current database of sabredav 3.1 and sabredav 3.2 i find no possibility to define such a addressbook-sharing. For calendars there is "calendarinstances" but there are not adressbookinstances.

Is this a custom development by fruux or am I missing something? I would be highly interested to have such a feature.

Best regards
Christoph

[DeepDiver1975]

I have no idea how fruux did implement their addressbook sharing - but I'd say it's a custom implementation which is not open source. There are basic interfaces for sharing addressbooks defined in the code base. This is how I did implement addressbook and calendar sharing within owncloud 2 years back.
You can find my implementation basically in here https://github.com/owncloud/core/tree/master/apps/dav/lib/DAV/Sharing