Each client app sets a persistent first-party device cookie ({app}_did).
On each request:
- Logged in: verify grant via account internal endpoint (cached 60s)
- Not logged in + device cookie: check-device endpoint detects if user
logged in since last grant revocation → triggers OAuth automatically
No cross-domain cookies. No propagation chain. Each app checks independently.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
- OAuthGrant model tracks each client authorization, tied to the
account session (issuer_session) that issued it
- OAuth authorize creates grant + code together
- Client apps store grant_token in session, verify via account's
internal /auth/internal/verify-grant endpoint (Redis-cached 60s)
- Account logout revokes only grants from that device's session
- Replaces iframe-based logout with server-side grant revocation
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
