Startup.cs

using Covers.BackgroundServices;
using Covers.Contracts.Interfaces;
using Covers.Hubs;
using Covers.Persistency;
using Covers.Services;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.SpaServices.ReactDevelopmentServer;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;

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

        public IConfiguration Configuration { get; }

        public void ConfigureServices(IServiceCollection services)
        {
            services.AddCors();
            services.AddResponseCompression();

            services.AddMvcCore()
               .AddApiExplorer();

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

            services.AddDbContext<CoversContext>(options =>
                         options.UseLazyLoadingProxies().UseSqlite(Configuration.GetConnectionString("CoversContext")));
            services.AddSignalR();
            services.AddTransient<ICoverService, CoverService>();
            services.AddTransient<IAlbumService, AlbumService>();
            services.AddTransient<IArtistService, ArtistService>();
            services.AddTransient<ITrackService, TrackService>();
            services.AddTransient<ICoverDownloadService, CoverDownloadService>();
            services.AddSingleton<ISpotifyService, SpotifyService>();
            services.AddHostedService<AlbumScanner>();
            services.AddSwaggerDocument();
        }

        public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
        {
            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }
            else
            {
                app.UseExceptionHandler("/Error");
            }

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

            app.UseOpenApi();
            app.UseSwaggerUi3();

            app.UseRouting();

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

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

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