What does this PR do?

There is a property (SCHEDULE-AGENT=CLIENT) a CalDAV client can add to the event that would prevent CalDAV servers from sending invitations.

This PR patches the used ics-2.37.0 to provide this functionality.

• Fixes #9485
• /claim #9485

Commits

• one commit 3e398bd57252232d18251f20f502cceed4ad24aa implements the OPTIONAL/NON-BREAKING functionality
• one commit 982f2e0eda7bc6299c82a56d9f9ce17702c24324 hardcodes SCHEDULE-AGENT=CLIENT in order to tests this within the app

Visual Demo

(me backend/core/hw designer - loosing it completely with UI workflows, and not sure what to produce here. Steps are trivial for another dev with a ready setup.)

Mandatory Tasks

• I have self-reviewed the code (A decent size PR without self-review might be rejected).
• I have updated the developer docs in /docs if this PR makes changes that would require a documentation change.
  • N/A (I assume its autogenerated)
• I confirm automated tests are in place that prove my fix is effective or that my feature works.

How should this be tested?

• run this version as usual (e.g. via yarn dev)
• add a fastmail CalDav Calendar
• create an event
  • => fastmail does NOT send an email anymore

Tests Applied by me

• I have validated the changes with the original tests in the ics repo-code (does not break anything)
• I have validated the changes within cal.com tests
  • does not break existent tests
  • new unit tests work as expected
• A: used cal.com on web, added fastmail CaDav, booked event
  • fastmail calendar DID send an email.
• B: yarn dev my version, connected fastmail CalDav, booked event
  • fastmail calendar did NOT send an email

User Interface

My understanding is that this core/backend-level work needs to be complemented by UI work.

Not sure about this though.

Summary by cubic

Added support for the SCHEDULE-AGENT property in calendar events by patching the ics library, allowing CalDAV clients to prevent servers from sending invitations.

• Dependencies
  • Applied a custom patch to ics@2.37.0 to support SCHEDULE-AGENT for organizers and attendees.