calendar-schedule / valarm support

[VijayLalwani]

vijay@GHOST:~$ curl -i -X OPTIONS -u "username:pssword" calendar server link
HTTP/2 200
server: nginx
date: Mon, 13 Jan 2025 16:41:54 GMT
allow: DELETE, GET, HEAD, MKCALENDAR, MKCOL, MOVE, OPTIONS, POST, PROPFIND, PROPPATCH, PUT, REPORT
dav: 1, 2, 3, calendar-access, addressbook, extended-mkcol
strict-transport-security: max-age=15768000; includeSubDomains;

I do not see calendar-schedule in the list of dav header list. Does Radicale not support scheduling?

I also added an event with valarm, but when I read the event again, it was stripped of valarm.

[pbiering]

calendar-schedule is not supported on server side, therefore not announced.

Regarding stripped VALARM - there is no code to strip any of such section from an item, check on file system side in a particular collection folder using grep VALARM *.ics

[VijayLalwani]

Is there any plan to support it in the future?

[pbiering]

Not so far, not that easy and can turn complex, see here for more: #1394

[VijayLalwani]

#1394 seems somewhat different from the issue I’m encountering. My specific issue occurs when sending an invite from Thunderbird using Radicale as the calendar backend. The invite does not include the VALARM section. However, when using Mailcow as the backend, the VALARM section is present in the .ics file.

I thought this might be related to calendar-schedule not being supported in Radicale, but please correct me if I’m mistaken.

[pbiering]

Indeed, tested here also with Thunderbird, item contains VALARM, invited another e-mail address, checked received e-mail content, the VALARM section has not survived. One has to analyze Thunderbird's behavior and hopefully find the reason.

[pbiering]

One can investigate whether Thunderbird will change its behavior in case the option is visible (but not implemented)

File: radicale/httputils.py:

- DAV_HEADERS: str = "1, 2, 3, calendar-access, addressbook, extended-mkcol"
+ DAV_HEADERS: str = "1, 2, 3, calendar-access, addressbook, extended-mkcol, calendar-schedule"

[VijayLalwani]

Adding calendar-schedule and calendar-auto-schedule to the DAV_HEADERS didn't work.

Either thunderbird code or debug can be inspected to understand thunderbirds behaviour.

[pbiering]

looks like not our bug

[VijayLalwani]

I won't mark this as a bug but a feature request to support calendar-schedule. Because this feature is not supported, Email clients like Thunderbird strips down VALARM part from the ics file.

I think this is the correct rfc https://datatracker.ietf.org/doc/html/rfc6638 that is used by sabre as well.

Is there any plan to implement this in the furture?

[pbiering]

Radicale is a lightweight server, there are no plans to implement such groupware feature on server side.