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Marc-André Bombeck
e6d9cc229a
The web OIDC flow ends in a session cookie the Bearer-transport native client cannot consume, so on an OIDC_ONLY instance the iOS app had no sign-in. Add a native leg: the app opens the login URL with client=native and its own PKCE S256 challenge inside an in-app browser; the callback resolves identity exactly as before, then mints a one-time handoff code and 302s to the fixed compiled-in scheme healthlog://oidc-callback (or hands back the existing MFA ticket when the account has a second factor). The app exchanges the code plus its PKCE verifier at POST /api/auth/oidc/native/token for the standard native token bundle. The return address is a compile-time constant — no redirect_uri parameter and no env allowlist, so the open-redirect / scheme-hijack class is removed by construction. The native flag and app challenge travel only inside the AES-256-GCM state blob, so a network attacker or the IdP cannot flip a web login into a native one. The handoff code is 256-bit CSPRNG, HMAC-hashed at rest, 90-second TTL, single-use via a guarded consume; a failed PKCE check burns it. A replay of a consumed code revokes exactly the pair the first exchange issued. The token pair never rides a URL; only the opaque code or the MFA ticket do. The SSO login can never satisfy requireFreshMfa step-up — the transport is Bearer and step-up is cookie-only. Adds the OidcNativeHandoff model (migration 0252), the token-exchange route, a daily cleanup sweep, and the OpenAPI entry.