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Self-hosters can sign in to the iOS app through their own domain, so the
password manager files credentials under the right site and passkeys run in
the correct origin. The app opens the instance's own web login inside an
ASWebAuthenticationSession; after an interactive login the server mints a
single-use, PKCE-locked handoff code on a compiled-in custom scheme, which the
app exchanges for the standard native token bundle. The token pair never rides
a URL — only the opaque code does.
Three endpoints mirror the OIDC native handoff and share its mint/consume core,
now extracted to native-handoff.ts (the OIDC leg keeps working unchanged, as
the default flow):
- GET /api/auth/native/login validates the PKCE challenge, sets a
short-lived encrypted state cookie, and
redirects to /auth/login?flow=native.
- GET /api/auth/native/complete validates the web session, enforces the
freshness binding, mints the code, and
redirects to healthlog://login-callback.
- POST /api/auth/native/token exchanges the code under the cookie-less
native transport gate for the native bundle.
The freshness binding refuses any session older than the flow start, so a
pre-existing browser session can never silently complete a handoff. The start
time is stamped from the database clock (SELECT now()) to stay comparable to
Session.createdAt with no app/DB skew, and createdAt is read through a
dedicated projection so the comparison cannot be silently dropped. A flow
discriminator on the handoff row (migration 0268) makes an OIDC code
non-redeemable at the web-login route and vice versa.
The callback scheme is a compile-time constant with no redirect_uri parameter,
requireAdmin and requireFreshMfa stay cookie-only, and the exchange mints no
wider scope than password login. The state cookie is AES-256-GCM with a fresh
IV. Adds the flow=native login-page banner in all six locales and the three
routes to the OpenAPI contract.
HealthLog API Spec
openapi.yaml is the canonical OpenAPI 3.1 description for the HealthLog
Next.js API. It is the source of truth for the native iOS client's
DTO codegen.
The MCP server is documented separately — it is a distinct contract over JSON-RPC, not part of the REST OpenAPI spec:
mcp-capabilities.md— the tool, resource, and prompt catalogue, the grounding contract, and the write model.mcp-skills.md— building a connector or skill on top of it.../self-hosting/mcp.md— enabling and connecting the surface (operator guide).
Preview locally
Open an interactive Redoc preview in your browser:
npx @redocly/cli preview docs/api/openapi.yaml
Generate static HTML for sharing:
npx @redocly/cli build-docs docs/api/openapi.yaml --output docs/api/index.html
Validate
npx @redocly/cli lint docs/api/openapi.yaml
The spec is expected to be lint-clean (errors = 0). Some warnings are intentional:
no-server-example.com—http://localhost:3000is the dev server.operation-2xx-response/operation-4xx-response— webhook + redirect endpoints intentionally omit one or the other.no-unused-components—ReminderPhaseis exposed for client codegen even though no path response references it directly.
Layout
info— title, version (mirrored frompackage.json), description.servers— productionhttps://healthlog.bombeck.ioplushttp://localhost:3000for local development.tags— domain groupings (Auth,Measurements,Medications,Mood,Dashboard,Insights,Achievements,DoctorReport,Integrations,User,Tokens,Notifications,Onboarding,Health,Settings,Analytics,Export,AuditLog,Monitoring,Webhooks,Ingest,Admin).securitySchemes:bearerAuth— long-livedhlk_*API tokens issued viaPOST /api/tokens. Required on/api/ingest/medication.sessionCookie— HttpOnlyhealthlog_sessioncookie set by the password and passkey login flows. Used by the web app and any iOS client running inside a web view.
components.schemas— DTOs for all routes plus the underlying Prisma models (e.g.Measurement,Medication,MedicationIntakeEvent,MoodEntry,User,DashboardLayout,ApiEnvelope,ApiError).paths— all routes fromsrc/app/api/**/route.ts, including the/api/admin/*family which is taggedAdminand marked internal.
Conventions
- Successful responses use the envelope
{ data, error: null }. - Error responses use the envelope
{ data: null, error: '<message>' }. - Pagination uses
limit+offsetquery parameters and ameta: { total, limit, offset }block on the response. - All timestamps are ISO 8601 / RFC 3339 (
format: date-time) in UTC. - IDs are CUIDs (opaque strings).
Updating the spec
When adding or changing routes:
- Update the relevant route handler under
src/app/api/**/route.ts. - Mirror the change in
openapi.yaml. KeepoperationIdcamelCase and stable — the iOS codegen keys off it. - Run
npx @redocly/cli lint docs/api/openapi.yamland resolve all errors. Warnings are tolerated when documented above. - Bump
info.versionif the change is breaking for clients.