Open Radar

 
Area:
Contacts

Summary:
Using macOS Mojave Contacts with a cardDAV server (ownCloud), the sync breaks after the first time.

Steps to Reproduce:
add cardDAV account to Contacts. First sync (from server to client) works, any sync after this breaks.

Contacts seems to use an UUID as sync-token which does not seem related to any of the UUID's found in the vCards.
The specs https://tools.ietf.org/html/rfc6578#section-4 require the sync token to be a valid URI and also requires the server to be in charge of the tokens. ownCloud uses a format eg: <D:sync-token>http://sabre.io/ns/sync/2285</D:sync-token>


Expected Results:
Synced contacts

Actual Results:
No sync.


Debugging my ownCloud installation, the REPORT request from Contacts has the following body:

<?xml version="1.0" encoding="UTF-8"?>
<A:sync-collection xmlns:A="DAV:">
  <A:sync-token>b905a5fd-ce23-4190-9be3-236969d071a8</A:sync-token>
  <A:sync-level>1</A:sync-level>
  <A:prop>
    <A:getetag/>
  </A:prop>
</A:sync-collection>

Any other sync agent uses (eg):

<?xml version="1.0" encoding="utf-8" ?>
<D:sync-collection xmlns:D="DAV:">
<D:sync-token>http://sabre.io/ns/sync/2285</D:sync-token>
<D:sync-level>1</D:sync-level>
<D:prop>
<D:getcontenttype />
<D:getetag />
</D:prop>
</D:sync-collection>


More information:
https://github.com/owncloud/core/issues/30820
https://central.owncloud.org/t/owncloud-10-0-9-mac-os-x-10-13-6-high-sierra-problem-sync-contacts-carddav-v/15621

Maybe related: https://github.com/owncloud/calendar/issues/959