PSA: Nextcloud public shared calendar links stopped working on 2022.2 update because they should have never worked

ACiDGRiM · March 11, 2022, 9:56pm

I had been using publinks to my calendars in nextcloud because I didn’t want to expose my password in anyway within the nextcloud configuration, even the secrets file. However, even with this setting I had the frustrating issue where calendar event series didn’t work such as M-F every week at 5:30. At the time, I just thought it was a defect and was begrudgingly waiting for a fix, per this bug: Calendar: Repeat events do not show in all views · Issue #40127 · home-assistant/core · GitHub

However when 2022.2 was released, all of my calendars stopped working completely and I hadn’t had time to investigate if it was a HA issue or a nextcloud issue until recently. I found this bug

github.com/home-assistant/core

Caldav won't load after updating to 2022.2

opened 07:50PM - 06 Feb 22 UTC

martijnvandijk

integration: caldav stale

### The problem Since updating to 2022.2 my caldav calendar won't load. #…## What version of Home Assistant Core has the issue? Home Assistant 2022.2.2 ### What was the last working version of Home Assistant Core? 2021.12 - latest release ### What type of installation are you running? Home Assistant OS ### Integration causing the issue Caldav ### Link to integration documentation on our website https://www.home-assistant.io/integrations/caldav/ ### Diagnostics information Not available, this integration doesn't have GUI setup. ### Example YAML snippet ```yaml calendar: - platform: caldav url: "https://next.wolck.net/remote.php/dav/public-calendars/iknPF5PRwQy8QzPR/?export" ``` ### Anything in the logs that might be useful for us? Caldav: ```txt Logger: caldav Source: /usr/local/lib/python3.9/site-packages/caldav/lib/error.py:28 First occurred: 8:37:41 PM (4 occurrences) Last logged: 8:37:41 PM Deviation from expectations found. Please raise an issue at https://github.com/python-caldav/caldav/issues or reach out to [email protected], include this error and the traceback and tell what server you are using Traceback (most recent call last): File "/usr/local/lib/python3.9/site-packages/caldav/lib/error.py", line 25, in assert_ assert(condition) AssertionError ``` Calendar integration: ```txt Logger: homeassistant.components.calendar Source: components/caldav/calendar.py:87 Integration: Calendar (documentation, issues) First occurred: 8:37:42 PM (1 occurrences) Last logged: 8:37:42 PM Error while setting up caldav platform for calendar Traceback (most recent call last): File "/usr/src/homeassistant/homeassistant/helpers/entity_platform.py", line 249, in _async_setup_platform await asyncio.shield(task) File "/usr/local/lib/python3.9/concurrent/futures/thread.py", line 52, in run result = self.fn(*self.args, **self.kwargs) File "/usr/src/homeassistant/homeassistant/components/caldav/calendar.py", line 87, in setup_platform calendars = client.principal().calendars() File "/usr/local/lib/python3.9/site-packages/caldav/objects.py", line 474, in calendars return self.calendar_home_set.calendars() File "/usr/local/lib/python3.9/site-packages/caldav/objects.py", line 441, in calendar_home_set if '@' in calendar_home_set_url and not '://' in calendar_home_set_url: TypeError: argument of type 'NoneType' is not iterable ``` ### Additional information _No response_

This indicates that the public subscription links are really just .ics ical file links and only accidentally worked even to a slight degree in HomeAssistant

The solution to use real CalDav links from next cloud is to follow the documented examples for CalDav. However I still didn’t want to enter my account password, even a app-password. What I did to solve this is to create an account in Nextcloud called “Assistant”, setup TOTP authentication and generate an app-password for it. Then I shared the calendars I wanted to appear in home assistant to this account which allows them to work correctly in Homeassistant.
Additionally, the issue that repeating events did not work is also resolved now using a real CalDav connection.

ServiceXp · March 11, 2022, 10:00pm

Thanks for the info. I was just getting started with this.

captainnapalm · March 23, 2022, 3:21am

Thanks for this info. Finally getting around to adding a calendar to HASS and this is helpful. I set this up very similar to you with a new account with an app-password, and shared my calendar to that account, although it’s not showing up in “My Calendars”.

EDIT: Seems to be working now.

Cloudhidden · July 8, 2022, 6:58am

Could you please share how you configured HA with your nextcloud user?

I followed the basic CalDav integration guide but my nextcloud calendar is not updating properly in HA so I wanted to try your method.

ACiDGRiM · July 9, 2022, 7:01am

Just re-read my OP,

make a basic user account, I call mine “assistant”
Open your calendar(s) on your personal account and share them to the basic user
Login in as the basic user (assistant)
In security create an application password
Open the calendar app in nextcloud as the basic account and copy your caldav url from calendar settings (lower right)
Configure the Caldav integration with this link, your basic user account name and the app password
All calendars shared to this basic user will appear in next cloud calendar, even future calendars shared without interaction.