When `PRIVATE_MODE=true`, every API path except a small allowlist
(`/health`, `/auth/{config,login,logout,register}`) requires a valid
session cookie or bearer token — anonymous reads are rejected with
401. Self-registration is force-disabled in private mode regardless
of `ALLOW_SELF_REGISTER`, so a locked-down instance flips with a
single switch (admins still mint accounts via `POST /admin/users`).
The backend gate is a tower middleware that reuses the existing
`CurrentUser` extractor, so the cookie + bearer paths cannot drift
from per-handler auth. `/auth/config` now exposes the flag plus the
effective `self_register_enabled` value so the frontend can render
the navbar correctly on the first paint.
On the frontend, a new universal root `+layout.ts` fetches the
config and redirects anonymous visitors to `/login?next=<path>`
before page-specific loads fire. The redirect is UX only — the
backend middleware is the source of truth, so crafted requests
still 401.
Defaults stay public (`PRIVATE_MODE=false`); existing deployments
need no env change.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Lets operators run a closed-membership deployment by setting
ALLOW_SELF_REGISTER=false (default true, so existing deploys are
unaffected). When off, POST /auth/register returns 403 forbidden. The
rate-limit token is consumed BEFORE the disabled check so the timing
doesn't distinguish enabled-but-rejected from disabled — closes the
toggle-state probe channel.
New public GET /auth/config returns { self_register_enabled: bool }
so the frontend can render its register affordances correctly
without conflating "disabled" with "rate-limited" (which a probe
attempt would).
Frontend: a lightweight reactive `authConfig` store loads the flag
once on root-layout mount (and again on /register direct navigation,
which bypasses the layout's onMount). Header hides the Register link
when the toggle is off; /register renders a "self-registration is
disabled — ask an administrator" notice instead of the form.
Admin-create endpoint that pairs with this toggle is intentionally
not in this PR — it lands as the next branch (feat/admin-user-create).
The toggle alone is independently useful for deployments that want
to lock down enrollment without yet wiring an admin UI.
