feat: add CalDAV server support for ProtonMail calendar [FaaFyfxR9WAQrL7FcAgEHJvztd8cVMxvjHRS55rw1nwH]

[waterWang]

Summary

Adds CalDAV server support for ProtonMail calendar, allowing users to sync their ProtonMail calendar events with any CalDAV-compatible client (e.g., Thunderbird, macOS Calendar, GNOME Evolution).

Changes

caldav/caldav.go (new)

• Full CalDAV backend implementation implementing the caldav.Backend interface from go-webdav
• Supports: PROPFIND, REPORT (calendar-query, calendar-multiget), GET, PUT (create/update), DELETE
• Calendar event decryption/decoding from ProtonMail encrypted calendar cards
• Event caching for performance

protonmail/calendar.go (updated)

• Added missing CalendarEvent fields: StartTime, EndTime, UID, etc.
• Added CalendarEventCard decryption (Read method) with cleartext, signed, and encrypted card support
• Added CRUD methods: GetCalendarEvent, CreateCalendarEvent, UpdateCalendarEvent, DeleteCalendarEvent

cmd/hydroxide/main.go (updated)

• Added caldav command
• Added CalDAV support to serve command
• Added -caldav-host, -caldav-port, -disable-caldav flags

Related

Closes #207, Closes #340

BountyHub: https://bountyhub.dev/bounty/81479fc7-ca8b-40aa-a117-8a01277e12b0

[emersion]

Original issue has been closed: there is no bounty for this anymore.