How to Implement Token-Based Authentication in ASP.NET Core with an AngularJS Client?

Token-Based Authentication in ASP.NET Core

Question:

How to implement token-based authentication in an ASP.NET Core application, where an AngularJS client requests a token by providing credentials, and the WebApi validates the user and returns an access token?

Answer:

1. Configuration in Startup.cs:

Create constants for the TokenAudience and TokenIssuer.

Add dependency injection services for the JWT signing key and the JwtSignInHandler.

Configure ASP.NET Core to use JWT Bearer authentication and specify the token validation parameters.

2. Authentication Setup:

Use app.UseAuthentication() before middleware that requires authentication.

3. Authorization Policy:

Add an AuthorizationPolicy to specify controllers and actions that require Bearer tokens.

4. Building the Token:

Create a JwtSignInHandler class with a method to build a JWT, passing in a ClaimsPrincipal.

In the controller where the token is needed, use the JwtSignInHandler service to create a token based on the principal.

5. Testing:

Obtain a token and validate it at jwt.io using the secret key from the configuration.

Note for .Net Core 3.1 Update:

Refer to David Fowler's example application for a simplified implementation of JWT.

Note for .Net Core 2 Update:

While RSA keys are not necessary, they are recommended for distributed systems. However, if distributing the responsibility, SymmetricSecurityKey can be used.

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