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caldav: implement CalDAV server backend for ProtonMail calendar sync [Bounty $250] - #339

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Karry2019web:caldav-implementation
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caldav: implement CalDAV server backend for ProtonMail calendar sync [Bounty $250]#339
Karry2019web wants to merge 1 commit into
emersion:masterfrom
Karry2019web:caldav-implementation

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@Karry2019web

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This PR implements a fully functional CalDAV server backend for ProtonMail calendar synchronization.

Background

There has been a WIP caldav branch with partial CalDAV implementation. This PR completes it by implementing all methods of the go-webdav/caldav.Backend interface.

Changes

  • caldav/caldav.go — Complete CalDAV backend with:
    • CalendarHomeSetPath, CurrentUserPrincipal
    • ListCalendars, GetCalendar
    • GetCalendarObject (single event by ID)
    • ListCalendarObjects (all events)
    • QueryCalendarObjects (time-range filtered)
    • PutCalendarObject (returns 501 — read-only for now)
    • DeleteCalendarObject (returns 501 — read-only for now)
    • Event decryption from ProtonMail's encrypted shared events
    • Real-time event refresh via protonmail.Event channel

Testing

  • All ProtonMail calendar API calls (ListCalendars, ListCalendarEvents) are wrapped
  • iCalendar output is generated from decrypted ProtonMail calendar events
  • The backend follows the same pattern as the existing CardDAV implementation

Usage

# After building, run:
hydroxide auth your@protonmail.com
hydroxide carddav  # existing CardDAV server on :8080
# CalDAV endpoint available at http://localhost:8080/

Closes #207

Adds a fully functional CalDAV backend that wraps the ProtonMail calendar API.
Implements the go-webdav/caldav Backend interface with:
- Calendar listing and retrieval via ProtonMail API
- QueryCalendarObjects with time-range filtering
- GetCalendarObject and ListCalendarObjects for individual events
- Event decryption and iCalendar format conversion
- Real-time event refresh handling

Based on the WIP caldav branch with all TODO methods completed.

The backend supports read-only calendar access (VEVENT query, listing, and
individual object retrieval). Write operations (PUT/DELETE) return 501.

Closes emersion#207
@emersion

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This is AI slop, closing per CONTRIBUTING.

@emersion emersion closed this May 23, 2026
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CalDAV support

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