Program.cs

// Copyright (c) Duende Software. All rights reserved.
// Licensed under the MIT License. See LICENSE in the project root for license information.

using System;
using System.Collections.Generic;
using System.IdentityModel.Tokens.Jwt;
using System.Net.Http;
using System.Security.Claims;
using System.Threading.Tasks;
using Client;
using Duende.IdentityModel;
using Duende.IdentityModel.Client;
using Microsoft.IdentityModel.Tokens;

// would normally load from a secure data store
var rsaKey = """
{
    "d":"GmiaucNIzdvsEzGjZjd43SDToy1pz-Ph-shsOUXXh-dsYNGftITGerp8bO1iryXh_zUEo8oDK3r1y4klTonQ6bLsWw4ogjLPmL3yiqsoSjJa1G2Ymh_RY_sFZLLXAcrmpbzdWIAkgkHSZTaliL6g57vA7gxvd8L4s82wgGer_JmURI0ECbaCg98JVS0Srtf9GeTRHoX4foLWKc1Vq6NHthzqRMLZe-aRBNU9IMvXNd7kCcIbHCM3GTD_8cFj135nBPP2HOgC_ZXI1txsEf-djqJj8W5vaM7ViKU28IDv1gZGH3CatoysYx6jv1XJVvb2PH8RbFKbJmeyUm3Wvo-rgQ",
    "dp":"YNjVBTCIwZD65WCht5ve06vnBLP_Po1NtL_4lkholmPzJ5jbLYBU8f5foNp8DVJBdFQW7wcLmx85-NC5Pl1ZeyA-Ecbw4fDraa5Z4wUKlF0LT6VV79rfOF19y8kwf6MigyrDqMLcH_CRnRGg5NfDsijlZXffINGuxg6wWzhiqqE",
    "dq":"LfMDQbvTFNngkZjKkN2CBh5_MBG6Yrmfy4kWA8IC2HQqID5FtreiY2MTAwoDcoINfh3S5CItpuq94tlB2t-VUv8wunhbngHiB5xUprwGAAnwJ3DL39D2m43i_3YP-UO1TgZQUAOh7Jrd4foatpatTvBtY3F1DrCrUKE5Kkn770M",
    "e":"AQAB",
    "kid":"ZzAjSnraU3bkWGnnAqLapYGpTyNfLbjbzgAPbbW2GEA",
    "kty":"RSA",
    "n":"wWwQFtSzeRjjerpEM5Rmqz_DsNaZ9S1Bw6UbZkDLowuuTCjBWUax0vBMMxdy6XjEEK4Oq9lKMvx9JzjmeJf1knoqSNrox3Ka0rnxXpNAz6sATvme8p9mTXyp0cX4lF4U2J54xa2_S9NF5QWvpXvBeC4GAJx7QaSw4zrUkrc6XyaAiFnLhQEwKJCwUw4NOqIuYvYp_IXhw-5Ti_icDlZS-282PcccnBeOcX7vc21pozibIdmZJKqXNsL1Ibx5Nkx1F1jLnekJAmdaACDjYRLL_6n3W4wUp19UvzB1lGtXcJKLLkqB6YDiZNu16OSiSprfmrRXvYmvD8m6Fnl5aetgKw",
    "p":"7enorp9Pm9XSHaCvQyENcvdU99WCPbnp8vc0KnY_0g9UdX4ZDH07JwKu6DQEwfmUA1qspC-e_KFWTl3x0-I2eJRnHjLOoLrTjrVSBRhBMGEH5PvtZTTThnIY2LReH-6EhceGvcsJ_MhNDUEZLykiH1OnKhmRuvSdhi8oiETqtPE",
    "q":"0CBLGi_kRPLqI8yfVkpBbA9zkCAshgrWWn9hsq6a7Zl2LcLaLBRUxH0q1jWnXgeJh9o5v8sYGXwhbrmuypw7kJ0uA3OgEzSsNvX5Ay3R9sNel-3Mqm8Me5OfWWvmTEBOci8RwHstdR-7b9ZT13jk-dsZI7OlV_uBja1ny9Nz9ts",
    "qi":"pG6J4dcUDrDndMxa-ee1yG4KjZqqyCQcmPAfqklI2LmnpRIjcK78scclvpboI3JQyg6RCEKVMwAhVtQM6cBcIO3JrHgqeYDblp5wXHjto70HVW6Z8kBruNx1AH9E8LzNvSRL-JVTFzBkJuNgzKQfD0G77tQRgJ-Ri7qu3_9o1M4"
}
""";

var jwk = new JsonWebKey(rsaKey);
var response = await RequestTokenAsync(new SigningCredentials(jwk, "RS256"));
response.Show();

Console.ReadLine();
await CallServiceAsync(response.AccessToken);

static async Task<TokenResponse> RequestTokenAsync(SigningCredentials signingCredentials)
{
    var client = new HttpClient();

    var disco = await client.GetDiscoveryDocumentAsync(Urls.IdentityServer);
    if (disco.IsError) throw new Exception(disco.Error);

    var clientToken = CreateClientToken(signingCredentials, "jwt.client.credentials.sample", disco.Issuer);
    var response = await client.RequestClientCredentialsTokenAsync(new ClientCredentialsTokenRequest
    {
        Address = disco.TokenEndpoint,

        ClientAssertion =
        {
            Type = OidcConstants.ClientAssertionTypes.JwtBearer,
            Value = clientToken
        },

        Scope = "scope1"
    });

    if (response.IsError) throw new Exception(response.Error);
    return response;
}

static string CreateClientToken(SigningCredentials credential, string clientId, string audience)
{
    var now = DateTimeOffset.UtcNow;

    var token = new JwtSecurityToken(
        clientId,
        audience,
        new List<Claim>()
        {
            new Claim(JwtClaimTypes.JwtId, Guid.NewGuid().ToString()),
            new Claim(JwtClaimTypes.Subject, clientId),
            new Claim(JwtClaimTypes.IssuedAt, now.ToUnixTimeSeconds().ToString(), ClaimValueTypes.Integer64)
        },
        now.UtcDateTime,
        now.UtcDateTime.AddMinutes(1),
        credential
    );

    token.Header[JwtClaimTypes.TokenType] = "client-authentication+jwt";

    var tokenHandler = new JwtSecurityTokenHandler();
    var clientToken = tokenHandler.WriteToken(token);
    "\n\nClient Authentication Token:".ConsoleGreen();
    Console.WriteLine(token);
    return clientToken;
}

static async Task CallServiceAsync(string token)
{
    var client = new HttpClient
    {
        BaseAddress = new Uri(Urls.SampleApi)
    };

    client.SetBearerToken(token);
    var response = await client.GetStringAsync("identity");

    "\n\nService claims:".ConsoleGreen();
    Console.WriteLine(response.PrettyPrintJson());
}