Startup.cs

using System.Threading.Tasks;
using System.Collections.Generic;

using Microsoft.AspNetCore.Authentication;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Identity;
using Microsoft.AspNetCore.Identity.UI;
using Microsoft.AspNetCore.HttpsPolicy;
using Microsoft.AspNetCore.SpaServices.ReactDevelopmentServer;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using Microsoft.OpenApi.Models;

using Swashbuckle;
using Swashbuckle.AspNetCore;
using Swashbuckle.AspNetCore.Swagger;

using WebFileServ.Model.DI;

using WebFileServ.Model.Entities.Identity;

using WebFileServ.Model.DAL.DataInit;
using WebFileServ.Model.DAL.DataBase.EF;

namespace WebFileServ.WebApp
{
    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)
        {
            new DIManager(AppEnviroment.WebApp)
                .Registry(services, Configuration);


            services.AddAuthentication()
                .AddIdentityServerJwt();


            services.AddControllersWithViews();
            services.AddRazorPages();

            ConfigureServicesSwagger(services);

            // In production, the React files will be served from this directory
            services.AddSpaStaticFiles(configuration =>
            {
                configuration.RootPath = "ClientApp/build";
            });
        }

        /// <summary>
        /// https://docs.microsoft.com/ru-ru/aspnet/core/tutorials/getting-started-with-swashbuckle?view=aspnetcore-3.1&tabs=visual-studio
        /// https://www.thecodebuzz.com/jwt-authorization-token-swagger-open-api-asp-net-core-3-0/
        /// </summary>
        /// <param name="services"></param>
        private void ConfigureServicesSwagger(IServiceCollection services) 
        {
            // Register the Swagger generator, defining 1 or more Swagger documents
            //services.AddSwaggerGen();
            services.AddSwaggerGen(c =>
            {
                c.SwaggerDoc(
                    "v1",
                    new OpenApiInfo
                    {
                        Title = "TheCodeBuzz-Service",
                        Version = "v1"
                    }
                    );

                c.AddSecurityDefinition("Bearer", new OpenApiSecurityScheme()
                {
                    Name = "Authorization",
                    Type = SecuritySchemeType.ApiKey,
                    Scheme = "Bearer",
                    BearerFormat = "JWT",
                    In = ParameterLocation.Header,
                    Description = "JWT Authorization header using the Bearer scheme."
                });

                c.AddSecurityRequirement(new OpenApiSecurityRequirement()
                {
                    {
                        new OpenApiSecurityScheme
                        {
                            Reference = new OpenApiReference
                            {
                                Type = ReferenceType.SecurityScheme,
                                Id = "Bearer"
                            }
                        },
                        new string[] {}
                    }
                });
            });
        }


        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
        public void Configure(IApplicationBuilder app, IWebHostEnvironment env, DataInitializer dataInitializer)
        {
            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
                app.UseDatabaseErrorPage();
            }
            else
            {
                app.UseExceptionHandler("/Error");
                // The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts.
                app.UseHsts();
            }

            app.UseHttpsRedirection();
            app.UseStaticFiles();
            app.UseSpaStaticFiles();

            app.UseRouting();

            app.UseAuthentication();
            app.UseIdentityServer();
            app.UseAuthorization();


            app.UseEndpoints(endpoints =>
            {
                endpoints.MapControllerRoute(
                    name: "default",
                    pattern: "{controller}/{action=Index}/{id?}");
                endpoints.MapRazorPages();
            });


            // Enable middleware to serve generated Swagger as a JSON endpoint.
            app.UseSwagger();
            // Enable middleware to serve swagger-ui (HTML, JS, CSS, etc.),
            // specifying the Swagger JSON endpoint.
            app.UseSwaggerUI(
                c =>
                {
                    c.SwaggerEndpoint("/swagger/v1/swagger.json", "My API V1");                    
                }
                );


            app.UseSpa(spa =>
            {
                spa.Options.SourcePath = "ClientApp";

                if (env.IsDevelopment())
                {
                    spa.UseReactDevelopmentServer(npmScript: "start");
                }
            });

            //Иницилизация данных
            //На данный момент только БД
            using (dataInitializer)
            {
                dataInitializer
                    .Init()
                    //Данная конструкция нужна, чтобы дождаться результат асинхронного метода при вызове из синхронного и не пропустить Exceptino
                    .GetAwaiter()
                    .GetResult();
            }
        }



    }
}