Calendar Import - 412 Precondition Failed

Keo

Hi 👋

I am trying to import an ICS Calendar (coming from Google Agenda) into Sogo, using Thunderbird Import feature.

I have an empty calendar that is well synchronized between Thunderbird and Sogo. I can create/modify/delete events in Thunderbird and it gets updated on Sogo (I can see that by using the web UI).

But when I try to import a calendar (using Thunderbird > Tools > Import > From file, into the existing synchronized calendar), some events fail when Thunderbird performs a PUT, and I see a 412 Precondition Failed error.

When I look at the Sogo container logs, I can see that error too. Here is an example:
mailcowdockerized-sogo-mailcow-1 | Apr 9 13:38:15 c670f41756f1 sogod [109771]: 79.143.250.140 "PUT /SOGo/dav/my-user-redacted@my-domain-redacted.com/Calendar/personal/4ucgtlft1bhagb9ld9enpen6gv@google.com.ics HTTP/1.0" 412 91/1221 0.021 - - -744K - 14

When I delete the faulty events from the ICS, the import works fine.

I managed to isolate one of the faulty event, and the problem seem to be coming from the ORGANIZER field.
If I change the mail address of this field (for an email that does not even exist), the import works.

Any idea what could cause the 412 error ? And how to prevent it ?

I am using the Mailcow stack version 2024-02 (will update soon) and Thunderbird version 115.9.0 on Debian Bookworm.

DocFraggle

Did you try to import the ICS file into your calendar directly with Sogo to check if it throws the same error as by importing via your Thunderbird Plugin?

Keo

Hi @DocFraggle , good point ! And thank you for the answer.

I just tested, and the import works fine (with an ICS containing one event that fails using Thunderbird Import).

I see that the import route is not the same as the one Thunderbird uses.

Sogo Web: POST on https://my-domain.com/SOGo/so/user@my-domain.com/Calendar/personal/import
Thunderbird Import: one PUT on https://my-domain.com/SOGo/dav/user@my-domain.com/Calendar/personal/2v8jv6b64a71roo62kc9p130v4%40google.com.ics and 2 REPORT

Is Sogo triggering any extra checks/actions when receiving data from the route that Thunderbird Import route uses ?

DocFraggle

Hmm, that would need digging deep into the Sogo code…

Keo

Looks like setting SOGoDisableOrganizerEventCheck = YES; in the Sogo config solved the issue.

I got this info from this thead: https://bugs.sogo.nu/view.php?id=5712

DerLinkman

Thanks! I don’t see a reason why not to adapt this into mailcows stock configs. So that change will be live in December Update.