oauth-server/OAuthServer/Controllers/OpenIdController.cs

using Microsoft.AspNetCore.Mvc;
using Microsoft.IdentityModel.Tokens;
using OAuthServer.Responses;
using OAuthServer.Services;

namespace OAuthServer.Controllers;

[ApiController]
public class OpenIdController(
    JwtService jwtService
) : ControllerBase {

    [HttpGet("/.well-known/openid-configuration")]
    public ActionResult<OpenIdConfiguration> GetOpenIdConfiguration() {
        return Ok(new OpenIdConfiguration {
            Issuer = "http://localhost:1234",
            AuthorizationEndpoint = "http://localhost:1234/oauth/authorize",
            TokenEndpoint = "http://localhost:1234/oauth/token",
            JwksUri = "http://localhost:1234/.well-known/jwks.json",
            ScopesSupported = ["openid"],
            ResponseTypesSupported = ["code"],
            GrantTypesSupported = ["authorization_code"],
            SubjectTypesSupported = ["public"],
            IdTokenSigningAlgValuesSupported = ["RS256"],
            ClaimsSupported = [
                "aud",
                "exp",
                "iat",
                "iss",
                "sub"
            ]
        });
    }

    [HttpGet("/.well-known/jwks.json")]
    public ActionResult<JwksResponse> GetJwks() {
        var rsaSecurityKey = new RsaSecurityKey(jwtService.RsaKey) {
            KeyId = "TODO; keyid"
        };
        var jsonWebKey = JsonWebKeyConverter.ConvertFromRSASecurityKey(rsaSecurityKey);
        return Ok(new JwksResponse {
            Keys = [jsonWebKey]
        });
    }
}