syncing shared address book with nextcloud 11 fails

[sbctm]

Short: Davdroid fails on syncing a shared address book with Nextcloud 11

Steps to reproduce:

1. Nextcloud: User ‘Michael’ shares an address book ‘testbook’ with the user ‘testacc’ (editable)
2. On Android, create a new Davdroid account for the user testacc
3. Select ‘testbook’ as addressbook
4. Sync.

Outcome: Sync fails with 404 not found errors, see debug here:
https://paste.fedoraproject.org/paste/dQ83-YArfGqmC74YEXVIJF5M1UNdIGYhyRLivL9gydE=

What I noticed is, that Davdroid is searching for a contact
/remote.php/carddav/addressbooks/testacc/testbook_shared_by_Michael/40550d2b-8400-495d-8265-0b540c37713a.vcf
while In the Nextcloud interface, the link shown for this addressbook is
/remote.php/dav/addressbooks/users/testacc/testbook_shared_by_Michael/

the first difference is, that Davdroid is searching at carddav, instead of dav. This shouldn’t be a problem, because carddav is redirected to dav by the server. However, the /users/ shown in the nextcloud interface is missing in the path of Davdroid.

Syncing testacc’s own addressbook works just fine. Any help is appreciated.

[rfc2822]

Hello,

Please provide verbose logs so that we can see why 40550d2b-8400-495d-8265-0b540c37713a.vcf was requested.

Is there any indication that this could be a DAVdroid problem? Looks like the server advertises /remote.php/carddav/addressbooks/testacc/testbook_shared_by_Michael/40550d2b-8400-495d-8265-0b540c37713a.vcf, but when DAVdroid requests it, it isn’t there.

[sbctm]

Hello rfc2822,

here is a verbose log:
https://paste.fedoraproject.org/paste/PBE-LTK9DJZ0RBBXUOM2RV5M1UNdIGYhyRLivL9gydE=

I think the log is consistent with your assumption. It seems like the server advertises a vcard that it can’t find later on. I’m not sure, however: There is a passage about a 404 (line 144) in the server’s response, where the vcard is advertised.

Can you tell me how to go on from here? If it’s the server’s mistake, I should probably talk to the nextcloud community?

[rfc2822]

@sbctm According to the logs, the server advertises this file, but does not provide it (but sends 404 instead). The other 404 in multi-status do not matter.

Please ask Nextcloud people, providing all the logs (or even this thread).

[sbctm]

Thanks for your kind advice. I have opened an issue on the nextcloud github page:
https://github.com/nextcloud/server/issues/3583