Cancelling an event via Status Dropdown doesn't send iMIP CANCEL request

[pabzm]

⚠️ This issue respects the following points: ⚠️

• This is a bug, not a question or a configuration/webserver/proxy issue.
• This issue is not already reported on Github OR Nextcloud Community Forum (I've searched it).
• Nextcloud Server is up to date. See Maintenance and Release Schedule for supported versions.
• I agree to follow Nextcloud's Code of Conduct.

Bug description

The email notification for an event that was cancelled only says that the event was updated, it does not show the status "cancelled". Thus the email looks as if some other attribute (e.g. the time) was changed, which is confusing.

Steps to reproduce

1. Create an event with an attendee.
2. Save it.
3. Open it, set status to cancelled.
4. Save it.
5. See email notification.

Expected behavior

The email notification should tell me that the event was cancelled.

Installation method

None

Nextcloud Server version

29 (29.0.4.1 on c.nc.com)

Operating system

None

PHP engine version

None

Web server

None

Database engine version

None

Is this bug present after an update or on a fresh install?

None

Are you using the Nextcloud Server Encryption module?

None

What user-backends are you using?

• Default user-backend (database)
• LDAP/ Active Directory
• SSO - SAML
• Other

Configuration report

No response

List of activated Apps

No response

Nextcloud Signing status

No response

Nextcloud Logs

No response

Additional info

No response

[ChristophWurst]

The email notification for an event that was cancelled only says that the event was updated, it does not show the status "cancelled". Thus the email looks as if some other attribute (e.g. the time) was changed, which is confusing.

To add to the confusion: if only the even status changed, it will show the SUMMARY (title) as changed.

[miaulalala]

The issue is that modifying the state is not actually sending a CANCEL but a REQUEST.

[SebastianKrupinski]

This is what happens when the status is used.

BEGIN:VCALENDAR
CALSCALE:GREGORIAN
VERSION:2.0
PRODID:-//IDN nextcloud.com//Calendar app 5.0.0-alpha.4//EN

BEGIN:VEVENT
CREATED:20240827T174104Z
DTSTAMP:20240828T145808Z
LAST-MODIFIED:20240828T145808Z
SEQUENCE:3
UID:762730a7-09a2-466e-b80a-b655b94fed06
DTSTART;TZID=America/Toronto:20240906T100000
DTEND;TZID=America/Toronto:20240906T110000

STATUS:CANCELLED

SUMMARY:This is a test
ATTENDEE;CN=User 2;CUTYPE=INDIVIDUAL;PARTSTAT=NEEDS-ACTION;ROLE=REQ-PARTICI
 PANT;RSVP=TRUE;LANGUAGE=en;SCHEDULE-STATUS=5.0:mailto:[email protected]
ORGANIZER;CN=User 1:mailto:[email protected]
END:VEVENT

END:VCALENDAR

Issue is with the iTipBroker its generating a request instead of a cancelled message.

[SebastianKrupinski]

Tested a fix.

The change required is in the Sabre\VObject\ITip\Broker:506, currently there is no test for events with a CANCELLED status property...

if (!$attendee['newInstances']) 

changing this to...

if (!$attendee['newInstances'] || $eventInfo['status'] === 'CANCELLED')

Fixes the issue and generates proper CANCEL messages.

[SebastianKrupinski]

Upstream PR: sabre-io/vobject#669

[phil-davis]

Fix has been released in https://github.com/sabre-io/vobject/releases/tag/4.5.6
which also supports upcoming PHP 8.4

[SebastianKrupinski]

Confirmed fixed with #48583

iTip messages are now generated when changing the event STATUS to CANCELLED.