Startup.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Identity;
using Microsoft.EntityFrameworkCore;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using ASPNETMVCCoreTest.Data;
using ASPNETMVCCoreTest.Models;
using ASPNETMVCCoreTest.Services;
using MySql.Data.EntityFrameworkCore;
using System.Reflection;
using Microsoft.IdentityModel.Tokens;

namespace ASPNETMVCCoreTest
{
    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.AddDbContext<ApplicationDbContext>(options =>
            //    options.UseMySQL(Configuration.GetConnectionString("DefaultConnection")));

            //services.AddIdentity<ApplicationUser, IdentityRole>()
            //    .AddEntityFrameworkStores<ApplicationDbContext>()
            //    .AddDefaultTokenProviders();

            //// Add application services.
            //services.AddTransient<IEmailSender, EmailSender>();

            //services.AddMvc();

            services.AddDbContext<ApplicationDbContext>(options =>
                options.UseMySQL(Configuration.GetConnectionString("DefaultConnection")));
            services.AddIdentity<ApplicationUser, IdentityRole>()
                .AddEntityFrameworkStores<ApplicationDbContext>()
                .AddDefaultTokenProviders();

            services.AddTransient<IEmailSender, EmailSender>();

            services.AddMvc();

            string connectionString = Configuration.GetConnectionString("DefaultConnection");
            var migrationsAssembly = typeof(Startup).GetTypeInfo().Assembly.GetName().Name;

            // configure identity server with in-memory stores, keys, clients and scopes
            services.AddIdentityServer()
                .AddDeveloperSigningCredential()
                .AddAspNetIdentity<ApplicationUser>()
                // this adds the config data from DB (clients, resources)
                .AddConfigurationStore(options =>
                {
                    options.ConfigureDbContext = builder =>
                        builder.UseMySQL(connectionString,
                            sql => sql.MigrationsAssembly(migrationsAssembly));
                })
                // this adds the operational data from DB (codes, tokens, consents)
                .AddOperationalStore(options =>
                {
                    options.ConfigureDbContext = builder =>
                        builder.UseMySQL(connectionString,
                            sql => sql.MigrationsAssembly(migrationsAssembly));

                    // this enables automatic token cleanup. this is optional.
                    options.EnableTokenCleanup = true;
                    options.TokenCleanupInterval = 30;
                });

            services.AddAuthentication()
                .AddGoogle("Google", options =>
                {
                    options.ClientId = "434483408261-55tc8n0cs4ff1fe21ea8df2o443v2iuc.apps.googleusercontent.com";
                    options.ClientSecret = "3gcoTrEDPPJ0ukn_aYYT6PWo";
                })
                .AddOpenIdConnect("oidc", "OpenID Connect", options =>
                {
                    options.Authority = "https://demo.identityserver.io/";
                    options.ClientId = "implicit";
                    options.SaveTokens = true;

                    options.TokenValidationParameters = new TokenValidationParameters
                    {
                        NameClaimType = "name",
                        RoleClaimType = "role"
                    };
                });
        }

        // 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();
                app.UseDatabaseErrorPage();
            }
            else
            {
                app.UseExceptionHandler("/Home/Error");
            }

            app.UseStaticFiles();

            // Possibly need to change this:
            //app.UseAuthentication();

            app.UseMvc(routes =>
            {
                routes.MapRoute(
                    name: "default",
                    template: "{controller=Home}/{action=Index}/{id?}");
            });
        }
    }
}