108 lines
2.8 KiB
Markdown
108 lines
2.8 KiB
Markdown
# Recurring Events
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Recurring events follow the iCalendar RFC 5545 RRULE standard. No backend
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changes are needed — CalDAV (SabreDAV) handles recurrence natively.
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## Architecture
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```
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RecurrenceEditor (React)
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-> IcsRecurrenceRule (ts-ics)
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-> RRULE string (RFC 5545)
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-> .ics file (CalDAV)
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-> SabreDAV server
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```
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## RecurrenceEditor Component
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Located at
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`src/frontend/apps/calendars/src/features/calendar/components/RecurrenceEditor.tsx`
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```tsx
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import { RecurrenceEditor } from '@/features/calendar/components/RecurrenceEditor';
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const [recurrence, setRecurrence] = useState<IcsRecurrenceRule>();
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<RecurrenceEditor value={recurrence} onChange={setRecurrence} />
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```
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Include in the event object:
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```typescript
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const event: IcsEvent = {
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// ...other fields
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recurrenceRule: recurrence,
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};
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```
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### Supported patterns
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| Pattern | RRULE |
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|---------|-------|
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| Every day | `FREQ=DAILY` |
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| Every 3 days | `FREQ=DAILY;INTERVAL=3` |
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| Every Monday | `FREQ=WEEKLY;BYDAY=MO` |
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| Mon/Wed/Fri | `FREQ=WEEKLY;BYDAY=MO,WE,FR` |
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| Every 2 weeks on Thu | `FREQ=WEEKLY;INTERVAL=2;BYDAY=TH` |
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| 15th of each month | `FREQ=MONTHLY;BYMONTHDAY=15` |
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| March 15 yearly | `FREQ=YEARLY;BYMONTH=3;BYMONTHDAY=15` |
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| 10 occurrences | append `;COUNT=10` |
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| Until a date | append `;UNTIL=20251231T235959Z` |
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### Not yet supported
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- `BYSETPOS` (e.g. "1st Monday of month", "last Friday")
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- Edit single instance vs series (needs RECURRENCE-ID UI)
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- Visual preview of recurrence pattern
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### Date validation
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The component warns about edge cases:
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- Feb 30/31 — "February has at most 29 days"
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- Feb 29 — "Only exists in leap years"
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- Day 31 on 30-day months — shown as warning
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### Translations
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Supported: English, French, Dutch. Keys are in
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`src/frontend/apps/calendars/src/features/i18n/translations.json`
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under `calendar.recurrence.*`.
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## IcsRecurrenceRule interface (ts-ics)
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```typescript
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interface IcsRecurrenceRule {
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frequency: 'DAILY' | 'WEEKLY' | 'MONTHLY' | 'YEARLY';
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interval?: number;
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count?: number;
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until?: IcsDateObject;
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byDay?: { day: 'MO'|'TU'|'WE'|'TH'|'FR'|'SA'|'SU' }[];
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byMonthDay?: number[];
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byMonth?: number[];
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}
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```
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## How CalDAV handles it
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1. RRULE is stored as a property in the VEVENT inside the `.ics` file
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2. SabreDAV expands recurring instances when clients query date ranges
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3. Individual instance modifications use RECURRENCE-ID (not yet in UI)
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Example `.ics`:
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```ics
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BEGIN:VEVENT
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UID:abc-123
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SUMMARY:Weekly Team Meeting
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DTSTART:20260125T140000Z
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RRULE:FREQ=WEEKLY;BYDAY=MO;UNTIL=20261231T235959Z
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END:VEVENT
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```
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## References
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- [RFC 5545 — iCalendar](https://datatracker.ietf.org/doc/html/rfc5545)
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- [RRULE spec](https://icalendar.org/iCalendar-RFC-5545/3-8-5-3-recurrence-rule.html)
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- [ts-ics](https://github.com/Neuvernetzung/ts-ics)
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- [SabreDAV](https://sabre.io/dav/)
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