Wednesday, August 4, 2021

IdentityServer4-II- Basic Token generation using in-memory user credentials

 1. Create a class which generates dummy user and client information. For now you can keep this class in startup.cs itself. 

    public class IS4Data

    {

        public static IEnumerable<IdentityResource> GetIdentityResources() =>

  new List<IdentityResource>

  {

          new IdentityResources.OpenId(),

          new IdentityResources.Profile()

  };


        public static List<TestUser> GetUsers() =>

          new List<TestUser>

          {

      new TestUser

      {

          SubjectId = "a9ea0f25-b964-409f-bcce-c923266249b4",

          Username = "AAAA",

          Password = "AAAAAAAA",

          Claims = new List<Claim>

          {

              new Claim("FirstName", "AAAA"),

              new Claim("LastName", "Aaaa")

          }

      },

      new TestUser

      {

          SubjectId = "ec792526-8645-4677-8acb-6c0e73a0217c",

          Username = "BBBB",

          Password = "BBBBBBBB",

          Claims = new List<Claim>

          {

              new Claim("FirstName", "BBBB"),

              new Claim("LastName", "Bbbb")

          }

      }

          };



        public static IEnumerable<Client> GetClients() =>

    new List<Client>

    {

       new Client

       {

            ClientId = "ABC Company Inc.",

            ClientSecrets = new [] { new Secret("samplesecret".Sha512()) },

            AllowedGrantTypes = GrantTypes.ResourceOwnerPasswordAndClientCredentials,

            AllowedScopes = { IdentityServerConstants.StandardScopes.OpenId }

        }

    };


Notice that we are just generating users, clients and identity resources. 

2. Replace the is4 code in ConfigureServices with the following : 

        public void ConfigureServices(IServiceCollection services)

        {

            services.AddControllers();


            services.AddIdentityServer()

                .AddInMemoryClients(IS4Data.GetClients())

                .AddInMemoryIdentityResources(IS4Data.GetIdentityResources())

                //.AddInMemoryApiResources(new List<ApiResource>())

                //.AddInMemoryApiScopes(new List<ApiScope>())

                .AddTestUsers(IS4Data.GetUsers())

                .AddDeveloperSigningCredential();

        }


Notice how we are adding InMemoryClients, IdentityResources and TestUsers using our IS4Data class.


3. Now run the project. 

4. From POSTMAN, send a post request with 5 parameters: client_id, client_secrets, grant_type, username and password. 


5. You should get a token in response. 


{
    "access_token""eyJhbGciOiJSUzI1NiIsImtpZCI6IkU1NTVDOURCOEVDNEFDQjg2MTI3MEEyNjlGQT
A4MjcyIiwidHlwIjoiYXQrand0In0.eyJuYmYiOjE2MjgwNzM2MzEsImV4cCI6MTYyODA
                                3NzIzMSwiaXNzIjoiaHR0cHM6Ly9sb2NhbGhvc3Q6NDQzMjciLCJjbGllbnRfaWQiOiJBQ
                                kMgQ29tcGFueSBJbmMuIiwic3ViIjoiYTllYTBmMjUtYjk2NC00MDlmLWJjY2UtYzkyMz
                                I2NjI0OWI0IiwiYXV0aF90aW1lIjoxNjI4MDczNjMxLCJpZHAiOiJsb2NhbCIsImp0aSI6IkU
                                yRDM5QTkxODBCRjM3MTE4NTdBOEY5OTVFRjE0Q0FBIiwiaWF0IjoxNjI4MDczNjMx
                                LCJzY29wZSI6WyJvcGVuaWQiXSwiYW1yIjpbInB3ZCJdfQ.FR6VyBTyEeHKL2jkln6txbGJ
                                2LSTbrGJXQvL4iMynjz6JqcOA6WYnOEFpCqSRQFxXSS12g5Y1mXqIylFmyYxfZ4FT8N9
                                Rpif23LmpS5jMBIQY_p1StQRhyDtU0nIHvIFQmQWBVAhZI8dieQmgzS6LUBWB_tXOejO
                                yfZA2OGgQgw_0MFUxjLI67FnOFEOxhO9DtLCo61_op9nROQ9AWQRnAek7GUCwb6jIboi
                                ODU9GTpHPGSHDcM9Gn_QmpAhc7yf3Ox1RyhFzwbewvBSixpUHoajrWo_NVdL9PBF5rT
                                8ey3lkG3UOK4O3zIfH40O6zPj_DXiXlJGcgsWYHtZN9Q1Fg",
    "expires_in"3600,
    "token_type""Bearer",
    "scope""openid"
}

The token is a JWT token. We can check using jwt.io





6. You can also call the userinfo endpoint. This should be a POST request with the above access-token
as a parameter. 




Below is the complete code of startup.cs: 

using IdentityServer4;
using IdentityServer4.Models;
using IdentityServer4.Test;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.HttpsPolicy;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using Microsoft.Extensions.Logging;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Security.Claims;
using System.Threading.Tasks;

namespace WebApplication2
{
    public class Startup
    {
        public Startup(IConfiguration configuration)
        {
            Configuration = configuration;
        }

        public IConfiguration Configuration { get; }

        // This method gets called by the runtime. Use this method to add services 
        //to the container.
        public void ConfigureServices(IServiceCollection services)
        {
            services.AddControllers();

            services.AddIdentityServer()
                .AddInMemoryClients(IS4Data.GetClients())
                .AddInMemoryIdentityResources(IS4Data.GetIdentityResources())
                //.AddInMemoryApiResources(new List<ApiResource>())
                //.AddInMemoryApiScopes(new List<ApiScope>())
                .AddTestUsers(IS4Data.GetUsers())
                .AddDeveloperSigningCredential();
        }

        // This method gets called by the runtime. Use this method to configure 
        //the HTTP request pipeline.
        public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
        {
            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }

            app.UseHttpsRedirection();

            app.UseRouting();

            app.UseAuthorization();

            app.UseEndpoints(endpoints =>
            {
                endpoints.MapControllers();
            });

            app.UseIdentityServer();
        }
    } //public class Startup


    public class IS4Data
    {
        public static IEnumerable<IdentityResource> GetIdentityResources() =>
  new List<IdentityResource>
  {
          new IdentityResources.OpenId(),
          new IdentityResources.Profile()
  };

        public static List<TestUser> GetUsers() =>
          new List<TestUser>
          {
      new TestUser
      {
          SubjectId = "a9ea0f25-b964-409f-bcce-c923266249b4",
          Username = "AAAA",
          Password = "AAAAAAAA",
          Claims = new List<Claim>
          {
              new Claim("FirstName", "AAAA"),
              new Claim("LastName", "Aaaa")
          }
      },
      new TestUser
      {
          SubjectId = "ec792526-8645-4677-8acb-6c0e73a0217c",
          Username = "BBBB",
          Password = "BBBBBBBB",
          Claims = new List<Claim>
          {
              new Claim("FirstName", "BBBB"),
              new Claim("LastName", "Bbbb")
          }
      }
          };


        public static IEnumerable<Client> GetClients() =>
    new List<Client>
    {
       new Client
       {
            ClientId = "ABC Company Inc.",
            ClientSecrets = new [] { new Secret("samplesecret".Sha512()) },
            AllowedGrantTypes = GrantTypes.ResourceOwnerPasswordAndClientCredentials,
            AllowedScopes = { IdentityServerConstants.StandardScopes.OpenId }
        }
    };

    } //IS4Data

//namespace



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