BellaBaxter.AspNet.Configuration 0.1.1-preview.19

BellaBaxter.AspNet.Configuration

ASP.NET Core IConfiguration provider that polls Bella Baxter for secrets and hot-reloads them into your app — no restart required.

Works with any .NET app that uses IConfiguration: ASP.NET Core, Worker Service, console apps.

Installation

dotnet add package BellaBaxter.AspNet.Configuration

Quickstart

appsettings.json (non-secret config — safe to commit):

{
  "BellaBaxter": {
    "BaxterUrl": "https://api.bella-baxter.io",
    "EnvironmentSlug": "production",
    "PollingInterval": "00:01:00"
  }
}

Program.cs:

var builder = WebApplication.CreateBuilder(args);

// Step 1 — Add Bella secrets as an IConfiguration source
// Reads BaxterUrl + EnvironmentSlug from appsettings.json
// Reads ApiKey from BELLA_BAXTER_API_KEY env var or BellaBaxter__ApiKey
builder.Configuration.AddBellaSecrets();

// Step 2 — Register source-generated typed class in DI (optional)
builder.Services.AddBellaTypedSecrets<BellaAppSecrets>();

// Step 3 — Inject anywhere (typed class, IConfiguration, IOptions<T>)
app.MapGet("/", (BellaAppSecrets s) => Results.Ok(new { s.Port, s.DatabaseUrl }));
app.MapGet("/raw", (IConfiguration config) => Results.Ok(config["DATABASE_URL"]));

Credentials — never in appsettings.json:

Explicit configuration

builder.Configuration.AddBellaSecrets(o =>
{
    o.BaxterUrl        = "https://api.bella-baxter.io";
    o.EnvironmentSlug  = "production";
    o.ApiKey           = Environment.GetEnvironmentVariable("BELLA_BAXTER_API_KEY")!;
    o.PollingInterval  = TimeSpan.FromSeconds(30);
    o.FallbackOnError  = true; // keep serving cached secrets if Baxter is temporarily unreachable
});

How it works

1. On startup: GET /api/v1/environments/{slug}/secrets → loads all secrets into IConfiguration
2. Every PollingInterval: GET /api/v1/environments/{slug}/secrets/version (lightweight version check)
3. If version changed: fetches full secrets → calls OnReload() → triggers IOptionsMonitor<T>.OnChange()
4. IConfiguration["MY_SECRET"] always reflects the latest value

Baxter serves secrets from a Redis HybridCache — polling does not hit your cloud provider (AWS/Azure/GCP/Vault) on every request. Cloud costs stay near zero regardless of polling frequency.

Typed secrets with source generator

Combine with BellaBaxter.SourceGenerator for compile-time type safety:

// Injected via DI — typed, IDE-friendly, no magic strings
app.MapGet("/", (BellaAppSecrets s) => new {
    s.DatabaseUrl,   // string
    s.Port,          // int
    s.FeatureFlag,   // bool
});

See the samples for complete working examples.

__ double underscore = section separator

.NET's IConfiguration maps __ to : in key names:

This means builder.Services.Configure<JwtOptions>(config.GetSection("Jwt")) maps directly to your Jwt__* secrets.