[How] can one add external CalDAV sources to the Tasks application?

[rokejulianlockhart]

The basics

1. Nextcloud Server version?

   31.0.10.2 ^[1]

2. Operating system and version?

   Better yet, rpm -qi firefox returns:

   Version : 144.0
   Release : 3.fc42
   

3. Reverse proxy and version?

   ⪆ nginx/1.18.0

4. Installation method?

   I utilise a provider: wim.nl.tab.digital.

5. Are you using CloudFlare, mod_security, or similar?

   Not that I see, but I do not know.

Summary of the issue you are facing

I don’t see any way to add an external CalDAV source to enumerate tasks from, like one can in the calendar-app. I want to in order to diagnose:

[Bug] “Expected 207 multi-status, got 200” appears when one attempts to create a list in a Vikunja CalDAV account.

…and integrate:

Problems with synchronization. (CalDAV)

Steps to replicate it

Visit wim.nl.tab.digital/apps/tasks.

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1. wim.nl.tab.digital/status.php, per:

   @devnull

   https://domain.TLD/status.php

   ↩︎

[bb77]

Sorry, I’m not sure what you mean by ‘external’ CalDAV sources.

As far as I know, adding external CalDAV sources was never supported in Nextcloud. In Nextcloud, it’s only possible to subscribe to external iCal feeds, which are read-only, and to be honest, I’m not sure if an iCal feed is even capable of serving tasks.

If you are trying to connect Tasks.org to the calendars/task lists provided directly by Nextcloud, I can only tell you that I use DAVx5 on my phone and Tasks.org can use the task lists provided by DAVx5 without any further configuration. I have never tried to connect it directly via CalDAV without DAVx5.

[rokejulianlockhart]

@bb77

Sorry, I’m not sure what you mean by ‘external’ CalDAV sources.

github.com/bitfireAT/davx5-manual’s accounts_collections.rst#what-is-the-base-url may sufficiently elaborate:

accounts_collections.rst

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@bb77

As far as I know, adding external CalDAV sources was never supported in Nextcloud. In Nextcloud, it’s only possible to subscribe to external iCal feeds, which are read-only, and to be honest, I’m not sure if an iCal feed is even capable of serving tasks.

@bb77, I have been able to add CalDAV URIs to the NextCloud calendar. However, in retrospect, it might not consume them. I’m surprised that allows me to add them if they’re, from its perspective, invalid.

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@bb77

I’m not sure if an iCal feed is even capable of serving tasks.

I’m uncertain, but possess reason to believe that what you describe, or similar, exists:

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@bb77

If you are trying to connect Tasks.org to the calendars/task lists provided directly by Nextcloud, I can only tell you that I use DAVx5 on my phone and Tasks.org can use the task lists provided by DAVx5 without any further configuration.

I am not. I am attempting to add alternative CalDAV sources to the NC server, similiarly to what DAVx⁵ permits, so that I:

1. …need not configure DAVx⁵ each time I reinstall AOSP (although configuration exportation and importation exists).

2. …am able to utilise all of my task lists with less competent synchronisers, on i(Pad)OS.

[bb77]

In this case, we’re really talking about two separate things:

1. Adding external calendars to the Nextcloud server.
2. Adding task lists from those calendars to the Tasks.org app.

Regarding the first point, If tasks from those calendars are being displayed, then I suppose that answers my earlier question . But creating new tasks or events in those subscribed calendars isn’t possible, neither in Nextcloud itself nor in any connected apps, because of their read-only nature. Also, I’m not even sure if subscribed calendars are exposed through CalDAV to client apps. As I said, I don’t personally use any.

As for the second point — there are two ways to add CalDAV accounts to Tasks.org: either directly through the CalDAV option in the app (which I haven’t tested), or via DAVx5. I use the latter, and it works perfectly, though I only sync my native Nextcloud calendars and task lists with it.

@rokejulianlockhart

I am not. I am attempting to add alternative CalDAV sources to the NC server, similiarly to what DAVx⁵ permits, so that I:

For the simple reason that calendar subscriptions are read-only, Nextcloud is of limited use for this purpose. The iCal subscription feature is really meant for things like public holiday calendars, organizational event schedules, and similar use cases.

Or in other words, Nextcloud is not suitable as an actual hub for external calendars due to the lack of a true CalDAV client mode. So if you really want/need to work with these external calendars, I wouldn’t do it this way and would add them all to DAVx5 on your phone. And yes, you’ll then have to set it up again on a new phone as well as on your desktop and all other devices you might want to use them.

@rokejulianlockhart

…am able to utilise all of my task lists with less competent synchronisers, on i(Pad)OS.

That’s because iOS already has DAVx5 built in, so to speak. Or, to put it more accurately, iOS includes a CalDAV/CardDAV client at the system level, whereas Android does not. DAVx5 essentially fills that gap by providing the missing functionality on Android.

[rokejulianlockhart]

@bb77

In this case, we’re really talking about two separate things:

1. Adding external calendars to the Nextcloud server.

2. Adding task lists from those calendars to the Tasks.org app.

@bb77, I’m not discussing the second point; I’m very familiar with davx5-ose ^[1] and tasks, ^[2] and that would be off-topic here for a Vikunja CalDAV source.

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@bb77

If tasks from those calendars are being displayed, then I suppose that answers my earlier question

Although I should have confirmed this first, I’ve recently created app.vikunja.cloud/tasks/213783:

…which I don’t observe in wim.nl.tab.digital/apps/tasks:

However, I don’t know how to force apps/calendar/listMonth/now to reload on-demand.

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@bb77

For the simple reason that calendar subscriptions are read-only, Nextcloud is of limited use for this purpose. The iCal subscription feature is really meant for things like public holiday calendars, organizational event schedules, and similar use cases.

iCal isn’t applicable to this, however. They’re incompatible standards.

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@bb77

iOS already has DAVx5 built in, so to speak. Or, to put it more accurately, iOS includes a CalDAV/CardDAV client at the system level, whereas Android does not. DAVx5 essentially fills that gap by providing the missing functionality on Android.

Darwin’s is a more basic implementation. I significantly prefer being able to choose my CalDAV manager on AOSP.

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1. github.com/bitfireAT/davx5-ose/discussions?discussions_q=author%3ARokeJulianLockhart+ ↩︎

2. github.com/tasks/tasks/issues?q=is%3Aissue%20author%3ARokeJulianLockhart ↩︎

[rokejulianlockhart]

@bb77

Nextcloud is not suitable as an actual hub for external calendars due to the lack of a true CalDAV client mode.

@bb77, in which case, I’ve filed a feature request:

[Enhancement] Allow ⪆ `31.0.10` to act as a CalDAV client.