UzunTec.API.Authentication.Engine 3.1.4

UzunTec API Authentication

Libraries and a sample REST API that help .NET developers add JWT Bearer authentication to ASP.NET Core applications. Token responses use snake_case property names (access_token, expires_in, token_type) for compatibility with common OAuth2-style clients and Identity Server–like payloads.

Repository layout

Solution file: UzunTec.API.Atuhentication.sln (note the filename spelling).

Requirements

• .NET Core SDK 3.1 (for the sample web project)
• For consuming only the Engine library: any host that supports netstandard2.0 and the referenced ASP.NET Core / JWT packages

Quick start (sample API)

From the repository root:

dotnet restore UzunTec.API.Atuhentication.sln
dotnet run --project UzunTec.API.Authentication.RestAPI/UzunTec.API.Authentication.RestAPI.csproj

By default the app listens on http://localhost:5000 (see Properties/launchSettings.json). Open http://localhost:5000/swagger to try the API.

Example flows in the sample

1. Obtain a token — GET /api/user/{user}

   • For admin, the sample returns a token with extra claims and the WritePermission role.
   • For other users, a simpler token is returned.

2. Call a protected endpoint — Send header:
   Authorization: Bearer <access_token>

   • GET /api/anyobject — requires any authenticated user.
   • GET /api/anyobject/{id} — requires role WritePermission.

3. Inspect token payload (sample) — GET /api/user/tokenData with Bearer token returns the JWT payload (implementation relies on the Engine’s token reader during validation).

Using the Engine in your own API

1. Reference the project or NuGet package

Add a project reference to UzunTec.API.Authentication.Engine, or install the published package UzunTec.API.Authentication.Engine (version and feed as defined by your team).

2. Configure AuthSettings in appsettings

Bind a section named to match your code (the sample uses AuthSettings):

{
  "AuthSettings": {
    "JtiCode": "your-jti-identifier",
    "Audience": "YourAudience",
    "Issuer": "YourIssuer",
    "TokenExpireTimeInSeconds": 7200,
    "SignatureKey": "your-secret-key-for-hmac-minimum-length-per-algorithm",
    "IgnoreSignature": false,
    "SignatureAlgorithm": "http://www.w3.org/2001/04/xmldsig-more#hmac-sha256"
  }
}

AuthenticationConfig defaults SignatureAlgorithm to HMAC SHA-256. For RSA, set it to http://www.w3.org/2001/04/xmldsig-more#rsa-sha256; the Engine will generate an RSA key pair when issuing tokens (see Authenticator).

3. Register services in Startup

services.AddAuthenticationEngine(Configuration.GetSection("AuthSettings"));

Then in the pipeline (order matters):

app.UseAuthentication();
app.UseAuthorization();

Use [Authorize] and [Authorize(Roles = "...")] on controllers or actions as usual.

4. Issue tokens from your login or token endpoint

Inject Authenticator and call:

• GenerateToken(string userCode)
• GenerateToken(string userCode, IReadOnlyDictionary<string, string> claims, IEnumerable<string> roles)

Returned TokenData exposes:

• Access_token — JWT string
• Expires_in — lifetime in seconds (from config)
• Token_type — e.g. "Bearer"

Security notes

• Replace sample SignatureKey, Issuer, Audience, and JtiCode with production values; never commit real secrets. Prefer user secrets, environment variables, or a secret manager in development.
• IgnoreSignature: true disables signing key validation — useful only for special test scenarios, not production.
• TokenExpireTimeInSeconds: 0 disables lifetime validation in the bearer options; use with care.
• In production, keep HTTPS enabled and set RequireHttpsMetadata appropriately if you harden JWT bearer options beyond the sample.

Building the NuGet package

The Engine project has GeneratePackageOnBuild enabled. Building the Engine produces a .nupkg under the output folder (typical path: bin/Debug or bin/Release).

dotnet pack UzunTec.API.Authentication.Engine/UzunTec.API.Authentication.Engine.csproj -c Release

License and attribution

Package metadata in the Engine project lists © 2020 Uzun Technology and repository https://github.com/uztec/api-auth. Add or adjust a LICENSE file in this repo if you need an explicit open-source license text.