src/Services/Identity/Identity.API/Startup.cs

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using Microsoft.AspNetCore.DataProtection;

namespace Microsoft.eShopOnContainers.Services.Identity.API
{
    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 IServiceProvider ConfigureServices(IServiceCollection services)
        {
            RegisterAppInsights(services);

            // Add framework services.
            services.AddDbContext<ApplicationDbContext>(options =>
                    options.UseSqlServer(Configuration["ConnectionString"],
                    sqlServerOptionsAction: sqlOptions =>
                    {
                        sqlOptions.MigrationsAssembly(typeof(Startup).GetTypeInfo().Assembly.GetName().Name);
                        //Configuring Connection Resiliency: https://docs.microsoft.com/en-us/ef/core/miscellaneous/connection-resiliency 
                        sqlOptions.EnableRetryOnFailure(maxRetryCount: 15, maxRetryDelay: TimeSpan.FromSeconds(30), errorNumbersToAdd: null);
                    }));

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

            services.Configure<AppSettings>(Configuration);

            if (Configuration.GetValue<string>("IsClusterEnv") == bool.TrueString)
            {
                services.AddDataProtection(opts =>
                {
                    opts.ApplicationDiscriminator = "eshop.identity";
                })
                .PersistKeysToStackExchangeRedis(ConnectionMultiplexer.Connect(Configuration["DPConnectionString"]), "DataProtection-Keys");
            }

            services.AddHealthChecks()
                .AddCheck("self", () => HealthCheckResult.Healthy())
                .AddSqlServer(Configuration["ConnectionString"],
                    name: "IdentityDB-check",
                    tags: new string[] { "IdentityDB" });

            services.AddTransient<ILoginService<ApplicationUser>, EFLoginService>();
            services.AddTransient<IRedirectService, RedirectService>();

            var connectionString = Configuration["ConnectionString"];
            var migrationsAssembly = typeof(Startup).GetTypeInfo().Assembly.GetName().Name;

            // Adds IdentityServer
            services.AddIdentityServer(x =>
            {
                x.IssuerUri = "null";
                x.Authentication.CookieLifetime = TimeSpan.FromHours(2);