CalDAV/CardDAV support

[kjarex]

Sorry for the question as it's somewhat unrelated, but as you all have the the relevant certificates and obviously also care about push notifications - has anyone of you also push for card/caldav running? If so, can you please point me to the project if there is any public source?

IF there isn't (I couldn't find any), would the xaps-daemon as it is be able to support those, too? Or would it need adjusting (I'm fully aware that CCS (or any other carddav/caldav server) would still need the plugin to even speak to the daemon in the first place - but this might be easier to get if it just needs to support the dovecot-xaps-daemon instead of the full way up to Apple's servers (with http/2 etc).

[freultwah]

AFAIK CalDAV/CardDAV push is done via XMPP PubSub and involves installing a Jabber server and setting up all kinds of SRV records in DNS. While there is some support for it in DAViCal, the code is very old and smells of mold and even though I've tried to make it work, I have not been able to.

[freswa]

The first implementation of the APNS (Apple Push Noticiation Service) relied on XMPP. Many of the client implementations that are well known, were made when that protocol was still in use. Though, XMPP was replaced with APNS binary protocol which has been deprecated for years and stopped working 1-2 years ago. The implementation of the APNS that has to be used by all services relies on HTTP/2. YMMV, this is just a brain dump.

I worked for a company a couple of years ago, where I helped implementing CalDAV/CardDAV APNS push for Apple devices.

I've been thinking about implementing the daemon part for some time, but there is no CalDAV/CardDAV implementation that is easily adoptable to finish the implementation on a few weekends.

If there is someone interested in sponsoring the work and we find a CalDAV/CardDAV project that is willing to implement the client part or is willing to accept a MR that implements it, I'd give it a shot.