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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/db.go
+13
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@@ -105,6 +105,19 @@ CREATE TABLE IF NOT EXISTS birthday_calendars (
color TEXT NOT NULL DEFAULT ''
);
-- User-added read-only calendars backed by a remote ICS/webcal URL (see
-- internal/db/ics.go, internal/web/ics.go, internal/caldav/ics.go). The
-- local calendar name (like real calendars) is unique per owner and lives
-- in the same "/cal/home/<name>/" namespace, so name collisions with the
-- calendars table and reservedCalendarNames are checked at creation time.
CREATE TABLE IF NOT EXISTS ics_subscriptions (
owner TEXT NOT NULL REFERENCES users (username) ON DELETE CASCADE,
name TEXT NOT NULL,
url TEXT NOT NULL,
color TEXT NOT NULL DEFAULT '',
PRIMARY KEY (owner, name)
);
-- Web UI login sessions. Sessions are opaque random tokens stored server
-- side (not JWTs) so they can be revoked instantly by deleting the row.
CREATE TABLE IF NOT EXISTS web_sessions (