`oauth-kit/client.ts` builds a provider's consent URL, code exchange,
refresh and deauthorization from a declaration of what differs: endpoints
and scope, client authentication (form or HTTP Basic, with or without the
client id beside it), the fields a grant adds, how an answer is classified
and the refusal named, the error type, and where the token sits in the
body. The seven hand-written copies of the redirect URI, authorization URL,
token post, Basic header and PKCE pair are gone; each provider keeps an
`oauth.ts` with its declaration.
Shared behaviour is now uniform: a 2xx without a token object (an empty or
non-JSON body) is a transient `empty_token_body` failure for every
provider. WHOOP, Strava and Google Health used to return null, and
Withings threw an unclassified SyntaxError; the OAuth wire golden records
exactly these lines changing and nothing else. Oura's live/legacy endpoint
fallback, Google's invalid_grant lift, Strava's Fault summary and Fitbit's
errorType are declared per provider.
Resilience sits behind Oura's `stress` scope, not `heart_health`, so a
connection that granted every scope HealthLog asked for still answered 401
on `daily_resilience`. `src/lib/oura/scope.ts` now maps every collection the
sync reads to the scope the live API enforces and is the one source for the
authorize request, the per-collection permission detection, the reconnect
hint and the settings card. The request asks for `stress` as well.
Oura names a missing scope in its 401 body ("Token is not authorized access
stress scope."), while a dead token reads differently. A collection refusal
now carries that scope: it spends no token refresh, never counts toward the
reconnect threshold and marks only the collections it names. A 403 (a lapsed
membership) is a persistent failure rather than a reconnect. The callback
also records what the token response says was granted, so an unticked
permission shows on the card before the first sync.
A browser can deliver an OAuth callback twice with the same code. Both
requests exchanged it, and Oura answers a reused code by revoking the token
the first exchange issued. Every connect callback (Oura, Polar, Strava,
WHOOP, Withings, Fitbit, Google Health) now claims its state in
`oauth_callback_claims` before the exchange: one request exchanges, the
duplicate waits for it and redirects to the same page without touching any
token. The ledger flows claim inside the transaction that consumes their
state row. A failed exchange settles with its error page, and a new connect
mints a new state.
Oura token refreshes are serialised per user with an advisory lock, so
overlapping syncs no longer spend the same single-use refresh token, and the
write stays conditional so a reconnect's new grant is never overwritten by a
refresh of the old one.
Marc-André Bombeck