feat(web): show ICS subscription events in detail view

internal/caldav/backend.go

@@ -41,10 +41,16 @@ type Backend struct {
 	icsCache *icssub.Cache
 }
 
-// NewBackend creates a CalDAV backend. dbase may be nil, in which case
-// calendar sharing is disabled (only a user's own calendars are visible).
-func NewBackend(cfg *config.Config, st *store.Store, dbase *db.DB, logger *slog.Logger) *Backend {
-	return &Backend{cfg: cfg, store: st, dbase: dbase, logger: logger, icsCache: icssub.NewCache(icssub.DefaultTTL)}
+// NewBackend creates a CalDAV backend over an existing ICS cache.
+// dbase may be nil, in which case calendar sharing is disabled (only a
+// user's own calendars are visible). The icsCache is shared with any
+// other consumers (notably the web UI) so CalDAV and the web calendar
+// page see identical, cache-consistent events for ICS subscriptions.
+func NewBackend(cfg *config.Config, st *store.Store, dbase *db.DB, logger *slog.Logger, icsCache *icssub.Cache) *Backend {
+	if icsCache == nil {
+		icsCache = icssub.NewCache(icssub.DefaultTTL)
+	}
+	return &Backend{cfg: cfg, store: st, dbase: dbase, logger: logger, icsCache: icsCache}
 }
 
 // NewHandler returns an http.Handler for the /cal/ prefix.
@@ -54,8 +60,8 @@ func NewBackend(cfg *config.Config, st *store.Store, dbase *db.DB, logger *slog.
 // property into PROPFIND responses for calendar collections, since
 // go-webdav's caldav.Backend interface has no extension point for
 // vendor-specific WebDAV properties.
-func NewHandler(cfg *config.Config, st *store.Store, dbase *db.DB, logger *slog.Logger) http.Handler {
-	b := NewBackend(cfg, st, dbase, logger)
+func NewHandler(cfg *config.Config, st *store.Store, dbase *db.DB, logger *slog.Logger, icsCache *icssub.Cache) http.Handler {
+	b := NewBackend(cfg, st, dbase, logger, icsCache)
 	return &colorInjectingHandler{backend: b, next: &caldav.Handler{Backend: b}}
 }