Startup.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Security.Claims;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Authentication.Cookies;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.HttpsPolicy;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.IdentityModel.Tokens;
using OneginiAuthClient.Onegini.AspNetCore.Authentication.OneginiOIDC;

namespace DotnetAspCoreMvcExample
{
    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.Configure<CookiePolicyOptions>(options =>
            {
                // This lambda determines whether user consent for non-essential cookies is needed for a given request.
                options.CheckConsentNeeded = context => true;
                options.MinimumSameSitePolicy = SameSiteMode.None;
            });
            
            services.AddAuthentication(o =>
            {
                o.DefaultAuthenticateScheme = CookieAuthenticationDefaults.AuthenticationScheme;
                o.DefaultSignInScheme = CookieAuthenticationDefaults.AuthenticationScheme;
                o.DefaultChallengeScheme = CookieAuthenticationDefaults.AuthenticationScheme;
            }).AddCookie().AddOneginiOpenIdConnect(o =>
            {
                o.Authority = Configuration["oidc:issuer"];
                o.ClientId = Configuration["oidc:clientId"];
                o.ClientSecret = Configuration["oidc:clientSecret"];                                                          
                o.CallbackPath = "/signin-external";
                o.ResponseType = "code";
                o.SaveTokens = true;
                o.UseTokenLifetime = false;
                o.GetClaimsFromUserInfoEndpoint = false;
                o.RequireHttpsMetadata = Boolean.Parse(Configuration["oidc:requireHttpsMetadata"]);
                // Add scopes if the Web client configuration contains these scopes as default or additional scopes.
                // o.Scope.Add("email");
                o.ProtocolValidator.RequireNonce = false;
                o.TokenValidationParameters = new TokenValidationParameters
                {
                    NameClaimType = ClaimTypes.NameIdentifier
                };
            });

            services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_1);
        }

        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
        public void Configure(IApplicationBuilder app, IHostingEnvironment env)
        {
            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }
            else
            {
                app.UseExceptionHandler("/Home/Error");
                app.UseHsts();
            }
            
            app.UseHttpsRedirection();
            app.UseStaticFiles();
            app.UseCookiePolicy();
            
            app.UseAuthentication();
            
            app.UseMvc(routes =>
            {
                routes.MapRoute(
                    name: "default",
                    template: "{controller=Home}/{action=Index}/{id?}");
            });
        }
    }
}