Events synced from other devices marked as "Public" even if visibility is not set

[hanubeki]

I created an event from other devices (for instance, Vivaldi on PC and Google Calendar on another Android device) and syncing with DAVx5 makes synced events marked as "Public" even if event privacy is not set. (privacy not checked on Thunderbird 128.x)
After that, editing synced events will mark event actually is "Public" (privacy checked as public on Thunderbird 128.x as well).

DAVx5 version: 4.4.3.2-gplay
Device 1: Google Pixel 4a with Android 13 2023-08-05 patch
Device 2: Alldocube iPlay50 mini Lite with Android 13
Other app: Vivaldi 6.x/7.0 on Windows 11
Other app: Thunderbird 128.x on Windows 11

Edit: by "privacy", I meant "visibility".

[rfc2822]

If you mean "privacy / classification", see here: https://manual.davx5.com/technical_information.html#event-classification

PUBLIC is the default value in iCalendar, if it's not specified. So there is no "no value" in iCalendar, it's then automatically PUBLIC.

So if you need anything else then PUBLIC, you have to set it explicitly.

[rfc2822]

No, according to the iCalendard standard it's the same. I have linked the relevant section above.

       classvalue = "PUBLIC" / "PRIVATE" / "CONFIDENTIAL" / iana-token
                  / x-name
       ;Default is PUBLIC

The last line means that if no value is present, it means the same as PUBLIC. So it may perfectly be that for instance the server sets CLASS:PUBLIC when no CLASS is originally sent.

---

However DAVx5 supports some "no value" things, see https://manual.davx5.com/technical_information.html#event-classification

Can you maybe provide a specific iCalendar that you think that behaves wrongly, or specific steps to reproduce including all used server and client software (name and versions) so that we can have a try?

[hanubeki]

Server: vivaldi.net
CalDAV client: DAVx5 4.4.3.2-gplay
Calendar app: Etar 1.0.47

1. Install and Open Etar app
2. Tap "plus" floating action button
3. Set calendar from DAVx5 account (vivaldi.net) for creating event
4. Set event title and date
5. Make sure visibility/privacy/classification (padlock icon) is default
6. Save the event
7. Sync calendar in the device that created the event and another device
8. Open Etar app on another device
9. Show the event created and enter edit screen
10. Etar on another device shows visibility/privacy/classification (padlock icon) is public.

Here's the event data (exported via Thunderbird 128.4.0esr)

BEGIN:VEVENT
DTSTAMP:20241115T131035Z
UID:71ea7adb-ba7a-4db8-a3c9-7a6ba1c94bb0
SUMMARY:テストイベント
STATUS:CONFIRMED
DTSTART;VALUE=DATE:20241118
DTEND;VALUE=DATE:20241119
TRANSP:TRANSPARENT
BEGIN:VALARM
ACTION:DISPLAY
TRIGGER:-PT10M
DESCRIPTION:テストイベント
END:VALARM
END:VEVENT

[rfc2822]

@devvv4ever Do we have a Vivaldi test account?

[rfc2822]

Thanks, I now know what you mean.

Currently "no value" is mapped to "public" to clearly indicate that an event without classification is public. Users who see "Default" could think the classification depends on some other thing, but it's actually public.

We could easily change it in DAVx5 so that no classification is mapped to Events.ACCESS_DEFAULT, which would show up as "Default" in your calendar app. However in CalDAV no value is still the same as CLASS:PUBLIC, so the server may at any time switch "public" with "default", and it means the same thing. Also users could think there is a meaningful difference between "default" and "public", but in CalDAV, there is no difference between those two things (only in Android).

[rfc2822]

But you're right, the manual says:

no CLASS → ACCESS_LEVEL = ACCESS_DEFAULT (“server default”)

which is currently wrong. I think mapping no value to ACCESS_DEFAULT is better, so we will change it.

[rfc2822]

See bitfireAT/ical4android#183