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The rule was "throw when the environment says production, otherwise log the code and carry on". The deployment sets no such marker, so the branch that ran was the developer one: every recipient and every usable sign-in code printed to a retained log, the screen reporting success, and nobody receiving anything. That is what a fail-open default costs. The deployment that forgets its mail settings is exactly the deployment with no marker saying it is a real one, so it takes the lenient branch precisely when it should not. Turned around: printing a live code is asked for by name and anything else is an error, so absence of configuration is a refusal instead of an assumption. Two settings out of three is also an error now, because it means somebody is halfway through wiring a provider up and a quiet fallback would hide the missing half. Stages anyone else can reach are checked at deploy time, so a missing setting stops the deploy with the name of the variable it wanted rather than surfacing later as a person waiting for mail that never comes.
apps/auth
The authentication worker for Nestri — a Cloudflare Worker built on
@nestri/auth (OpenAuth-style issuer).
What it does
Hosts the OpenID Connect / OAuth issuer and the login UI:
- Steam OAuth — the primary login flow. After Steam redirects back, the worker fetches the
player's profile, creates (or finds) the
User+LinkedAccountrows in Postgres, auto-creates a personal team on first login, and issues a JWTusersubject containing{ userID, linkedAccountID }. - SSH login — authenticates a device via its SSH fingerprint (keyed by
SSH_AUTH_KEY), resolving the identity throughSteam.resolveSshIdentityin@nestri/core.
Key details
- Signing keys are generated at runtime and persisted in the
AuthStorageKV namespace. - JWT subjects are defined in
@nestri/core/auth/subjects. - The API worker calls this worker via a service binding (
AUTH), verified throughAUTH_ISSUER_URL.
Structure
src/index.ts # Worker entrypoint: issuer config + success callbacks (steam, ssh)
test/ # Worker tests
Running
Deployed through Alchemy (apps/auth worker in alchemy.run.ts at the repo root) with bindings
AuthStorage (KV), HYPERDRIVE (Postgres), STEAM_API_KEY, SSH_AUTH_KEY.