Implement comprehensive CalDAV calendar integration to import calendar events
as time entries from CalDAV-compatible servers (Zimbra, Nextcloud, ownCloud).
Features:
- CalDAV client with calendar discovery and event fetching
- Automatic calendar discovery from server URL
- Import calendar events (VEVENT) as time entries
- Project matching from event titles with fallback to default project
- Idempotent sync using IntegrationExternalEventLink to prevent duplicates
- Per-user integration setup (similar to Google Calendar)
- Support for both server URL (with discovery) and direct calendar URL
- SSL certificate verification toggle for self-signed certificates
- Configurable lookback period for event import
Components:
- CalDAVCalendarConnector: Main integration connector with sync logic
- CalDAVClient: Low-level CalDAV client using PROPFIND/REPORT requests
- IntegrationExternalEventLink: Model for tracking imported events (idempotency)
- Setup UI: User-friendly form for configuration
- Comprehensive validation and error handling
- Full test coverage (unit, integration, route tests)
- Documentation: Setup guide and troubleshooting
Technical details:
- Uses icalendar library for parsing VEVENT components
- Handles timezone conversion (CalDAV UTC to app local timezone)
- Skips all-day events (only imports timed events)
- Stores credentials securely (password in access_token, username in extra_data)
- Automatic calendar discovery on first sync if only server URL provided
Migration:
- Adds integration_external_event_links table for sync tracking
- Unique constraint on (integration_id, external_uid) prevents duplicates
Documentation:
- CALDAV_INTEGRATION.md: Complete feature documentation
- CALDAV_QUICK_SETUP.md: Step-by-step setup guide with examples
Closes feature request for CalDAV/Zimbra integration.
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