Program.cs

using Connect.Data;
using Connect.Models;
using Connect.Signal;
using Microsoft.AspNetCore.Identity;
using Microsoft.EntityFrameworkCore;

namespace Connect
{
    public class Program
    {
        public static void Main(string[] args)
        {
            var builder = WebApplication.CreateBuilder(args);

            builder.Services.AddAuthentication().AddGoogle(googleOptions =>
            {
                googleOptions.ClientId = builder.Configuration["Authentication:Google:ClientId"];
                googleOptions.ClientSecret = builder.Configuration["Authentication:Google:ClientSecret"];
            });

            var connectionString = builder.Configuration.GetConnectionString("DefaultConnection") ?? throw new InvalidOperationException("Connection string 'DefaultConnection' not found.");
            builder.Services.AddDbContext<ApplicationDbContext>(options =>
                options.UseSqlServer(connectionString));
            builder.Services.AddDatabaseDeveloperPageExceptionFilter();

            builder.Services.AddDefaultIdentity<ApplicationUser>(options => options.SignIn.RequireConfirmedAccount = false)
                .AddEntityFrameworkStores<ApplicationDbContext>();

            builder.Services.AddControllersWithViews();

            builder.Services.AddSignalR();

            builder.Services.AddSingleton<RoomManager>();

            var app = builder.Build();

            if (app.Environment.IsDevelopment())
            {
                app.UseMigrationsEndPoint();
            }
            else
            {
                app.UseExceptionHandler("/Home/Error");
                app.UseHsts();
            }

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

            app.UseRouting();

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

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

            app.MapHub<ConnectHub>("/Signal/Connect");

            app.Run();
        }
    }
}