Program.cs

using Microsoft.AspNetCore.Authentication;
using Microsoft.AspNetCore.Authentication.Cookies;
using Microsoft.AspNetCore.Authentication.Google;
using Microsoft.EntityFrameworkCore;
using votegdgc.Data;

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

            builder.Services.AddDbContext<AppDbContext>(options =>
            {
                options.UseSqlServer(builder.Configuration.GetConnectionString("DefaultConnection"));
            });

            builder.Services.AddAuthentication(options =>
                {
                    options.DefaultScheme = CookieAuthenticationDefaults.AuthenticationScheme;
                    options.DefaultChallengeScheme = GoogleDefaults.AuthenticationScheme;
                })
                .AddCookie()
                .AddGoogle(options =>
                {
                    options.ClientId = builder.Configuration["Authentication:Google:ClientId"];
                    options.ClientSecret = builder.Configuration["Authentication:Google:ClientSecret"];

                    options.Scope.Add("profile");

                    options.ClaimActions.MapJsonKey("urn:google:picture", "picture", "url");
                    //// Tùy chọn: Thêm scope để lấy thêm thông tin
                    //options.Scope.Add("profile");
                    //options.Scope.Add("email");

                    //// Tùy chọn: Xử lý callback
                    //options.Events.OnCreatingTicket = context =>
                    //{
                    //    // Lấy thêm thông tin từ Google nếu cần
                    //    var user = context.Principal;
                    //    // Xử lý logic của bạn ở đây
                    //    return Task.CompletedTask;
                    //};
                });

            // Add services to the container.
            builder.Services.AddControllersWithViews();

            var app = builder.Build();

            // Configure the HTTP request pipeline.
            if (!app.Environment.IsDevelopment())
            {
                app.UseExceptionHandler("/Home/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.UseRouting();

            app.UseAuthorization();

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

            app.Run();
        }
    }
}