DioRed.Dais.Client 1.0.0-preview.4

DioRed.Dais.Client

DioRed.Dais.Client provides a strongly-typed, high-level DAIS client_credentials OAuth2 client for server-to-server communication.

It handles:

• Fetching access tokens using client_id + client_secret
• Token caching and automatic refresh
• Attaching Authorization: Bearer headers to outgoing requests
• Seamless HttpClient integration via IHttpClientFactory

🚀 Installation

dotnet add package DioRed.Dais.Client

✨ Quick Start

Register a DAIS-backed HttpClient:

builder.Services.AddDaisClient("my-api", o =>
{
    o.Authority    = "https://auth.example.com";
    o.ClientId     = "service-a";
    o.ClientSecret = builder.Configuration["Dais:ServiceA:Secret"];
    o.Scopes       = new[] { "my-api.read" };
});

builder.Services.AddHttpClient("my-api", client =>
{
    client.BaseAddress = new Uri("https://api.example.com");
});

Use it in services:

public class ApiService
{
    private readonly HttpClient _client;

    public ApiService(IHttpClientFactory factory)
    {
        _client = factory.CreateClient("my-api");
    }

    public async Task<string> GetDataAsync()
    {
        var response = await _client.GetStringAsync("/v1/data");
        return response;
    }
}

All requests automatically receive:

Authorization: Bearer {access_token}

🔐 How It Works

The library implements:

1. DaisTokenClient

Retrieves and caches client_credentials tokens from:

POST {Authority}/oauth/token
grant_type=client_credentials
client_id=...
client_secret=...
scope=...

2. DaisClientCredentialsHandler

A delegating handler that:

• obtains a fresh token when needed,
• attaches it to each outbound request.

3. AddDaisClient(...) extension

Registers all required components with proper DI lifetimes.

⚙️ Advanced Usage

Custom scopes:

o.Scopes = new[] { "payments.write", "orders.read" };

Custom token endpoint:

o.TokenEndpoint = "https://auth.example.com/custom-token";

Multiple DAIS-backed HttpClients:

builder.Services.AddDaisClient("service-a", ...);
builder.Services.AddDaisClient("service-b", ...);

📚 Summary

Use DioRed.Dais.Client for any app-to-api or microservice-to-microservice authentication:

• backend jobs
• background services
• microservice communication
• internal admin tools
• API gateways

For interactive login in web apps (Authorization Code + PKCE), use:

👉 DioRed.Dais.AspNetCore