Final Slice 2 sub-slice: users on iCloud / Fastmail / Nextcloud /
Radicale / Baikal / SOGo can now create a brand-new calendar from the
Paliad UI with one click; users on Google CalDAV (and any future
no-MKCALENDAR provider) get a clean degrade UX that nudges them to
create the calendar in their provider's app and paste the URL back.
Per m's Q2 pick, the capability lives on user_caldav_config so the
probe runs once per server change, not per modal open.
Schema (mig 108)
- paliad.user_caldav_config.supports_mkcalendar boolean — NULL =
unprobed, TRUE = supported, FALSE = degrade.
- paliad.user_caldav_config.mkcalendar_probed_at timestamptz — used
by the next round of probes after SaveConfig invalidates.
- Idempotent (information_schema column-exists checks) + assertion.
CalDAV client
- ProbeMKCalendar: OPTIONS Allow header first; on absence of
MKCALENDAR, falls back to a synthetic MKCALENDAR against a
random .paliad-probe-XX/ path (with DELETE cleanup) to catch
legacy SOGo / misconfigured Radicale (design §4.2).
- MakeCalendar: issues MKCALENDAR with displayname + VEVENT-only
supported-components; returns ErrCalendarNameTaken on 405 so
the service layer can retry with a disambiguating suffix.
- Sentinel errors ErrCalendarNameTaken, ErrMKCalendarUnsupported.
Service
- CalDAVService.ensureMKCalendarProbed: lazy probe on first
/api/caldav-discover call after credential change; result persisted
via UPDATE on user_caldav_config. DiscoverCalendars response now
carries supports_mkcalendar so the UI can show / hide the create-new
radio.
- CalDAVService.MakeCalendar: re-probes if needed, issues MKCALENDAR
via the client (with 3-try -XX-suffix retry on name collision),
creates the matching binding, kicks off PushBindingNow. Returns
the partial result on push failure so the UI can show "created but
initial sync failed".
- InvalidateDiscoveryCache now also clears supports_mkcalendar so a
re-configured server gets re-probed on next open.
HTTP API
- POST /api/caldav-mkcalendar — {display_name, scope_kind, scope_id?,
include_personal?} → 201 {calendar_path, binding, initial_pushed}.
Errors: 501 supports_mkcalendar=false, 409 name conflict, 5xx
upstream. Partial-success (binding created, push failed) carries
initial_sync_error in the body so the UI can surface both bits.
Frontend
- Add-modal source picker becomes a 3-way radio: "Existierenden
wählen" / "Neuen Kalender erstellen" / "Eigene URL eingeben".
Create radio is visible only when supports_mkcalendar=true;
when false, the bilingual Google-degrade notice is shown
beneath the source picker.
- Submit dispatches to /api/caldav-mkcalendar (create) or
/api/caldav-bindings (existing / custom).
- 6 new i18n keys DE+EN under caldav.bindings.modal.source.*
+ caldav.bindings.error.create_*.
Verification
- mig 108 dry-run against live Supabase: both columns added, nullable,
no constraint surprise.
- go build ./... + go test ./internal/services/ ./internal/handlers/ +
bun run build all clean.
Slice 2 complete (2a + 2b + 2c). Slice 3 (hierarchy scopes:
client/litigation/patent/case) and Slice 4 (drop legacy scalar
caldav_uid/caldav_etag) remain.
mAi
fbd087e0cd