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Add ICS/webcal HTTP subscription calendars

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Users can now subscribe to a remote ICS/webcal feed from the dashboard
(name + color), the same way they set up a real calendar or the virtual
Birthdays calendar. Subscriptions are read-only, per-user, and share the
"/cal/home/<name>/" namespace with real calendars and "birthdays" (name
collisions are rejected in both directions).

- internal/db: new ics_subscriptions table + CRUD (internal/db/ics.go);
  CreateCalendarWithColor checks for a colliding subscription name.
- internal/icssub: shared HTTP-fetch + TTL cache (15 min) for remote ICS
  calendars, with webcal:// -> https:// rewriting and stale-on-error
  fallback, used by both the web UI and the CalDAV backend.
- internal/web: dashboard "Subscribe to an ICS/webcal calendar" form,
  color picker, delete button (internal/web/ics.go,
  templates/dashboard.templ); month view renders subscription events in
  their chosen color, read-only (internal/web/calendar.go).
- internal/caldav: subscriptions are exposed as read-only calendars
  (internal/caldav/ics.go) - listed in PROPFIND, events served via
  GET/REPORT, PUT/DELETE on individual events rejected with 403, but
  DELETE on the calendar itself unsubscribes; calendar-color is injected
  the same way as for real calendars and Birthdays.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
This commit is contained in:
arnef
2026-08-20 22:10:49 +02:00
co-authored by Copilot
parent 2cb6e98db6
commit 1707ab4060
12 changed files with 818 additions and 104 deletions
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internal/db/users.go
+10
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@@ -193,6 +193,16 @@ func (d *DB) CreateCalendarWithColor(owner, name, color string) error {
if reservedCalendarNames[strings.ToLower(name)] {
return ErrReservedName
}
// The "/cal/home/<name>/" namespace is shared with ICS subscriptions
// (see internal/db/ics.go), so a real calendar can't be created under
// a name already taken by one of those either.
var subExists int
if err := d.conn.QueryRow(`SELECT COUNT(*) FROM ics_subscriptions WHERE owner = ? AND name = ?`, owner, name).Scan(&subExists); err != nil {
return fmt.Errorf("checking ics subscription name: %w", err)
}
if subExists > 0 {
return ErrResourceExists
}
_, err := d.conn.Exec(`INSERT INTO calendars (owner, name, color) VALUES (?, ?, ?)`, owner, name, color)
if err != nil {
if isUniqueConstraintErr(err) {