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Oleksandr Bezdieniezhnykh 7025f4d075 refactor: enhance JWT authentication and CORS configuration

Updated JWT authentication to use configuration values instead of hardcoded secrets, improving security and flexibility. Enhanced CORS policy to conditionally allow origins based on configuration settings, with logging for permissive defaults. Updated README to reflect project renaming and clarify service context.

2026-05-14 19:48:25 +03:00

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Flow F7 — Health probe

Trivial flow. Documented for completeness because it is the contract every external orchestrator (Watchtower, docker compose healthcheck, reverse proxy) relies on.

Description

GET /health returns { "status": "healthy" } with no auth. Confirms the process is up and the HTTP pipeline is serving — does NOT confirm DB connectivity, JWT validation works, or any feature endpoint is reachable.

Preconditions

HTTP pipeline is serving (i.e., F6 reached app.Run()).

Sequence Diagram

sequenceDiagram
    autonumber
    participant Probe as Watchtower / compose / reverse proxy
    participant Host as 07_host
    Probe->>Host: GET /health (no Authorization header)
    Host-->>Probe: 200 OK + { "status": "healthy" }

Flowchart

flowchart LR
    Start([GET /health]) --> Resp([200 OK + healthy])

Data Flow

Step	From	To	Data	Format
1	Probe	`MapGet("/health")`	(no body, no auth)	HTTP GET
2	`MapGet("/health")`	Probe	`{ "status": "healthy" }`	JSON (PascalCase irrelevant — single key)

Error Scenarios

Error	Where	Detection	Recovery
Process down	TCP layer	Probe gets `ECONNREFUSED`	Orchestrator restarts container
Pipeline not yet at `app.Run()` (mid-startup)	TCP layer	TCP connect succeeds but no response	Probe times out; orchestrator typically retries with backoff

Performance Expectations

Metric	Target	Notes
Latency	<5ms	Pure pipeline execution; no I/O
Throughput	bounded only by ASP.NET Core's request handling	Not load-tested

Future improvement (carry-forward, NOT this Epic)

Add a DB ping:

app.MapGet("/health", async (AppDataConnection db) =>
{
    await db.ExecuteAsync("SELECT 1");
    return Results.Ok(new { status = "healthy" });
});

This would let flight-gate and reverse-proxy checks reflect actual readiness rather than process liveness. Today the migrator runs at startup and crashes the process on DB failure (F6), which is a coarse but workable substitute for one-shot bring-up. In a steady-state running device, a transient DB outage AFTER startup would not be caught by /health today.

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