Program.cs

using DoctorSystem.Data;
using DoctorSystem.Models;
using DoctorSystem.Services;
using Microsoft.AspNetCore.Identity;
using Microsoft.AspNetCore.Identity.UI.Services;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.DependencyInjection;
using System.Configuration;
using Microsoft.AspNetCore.Authentication.Google;
using Microsoft.Extensions.Options;
using DoctorSystem.Singleton;

var builder = WebApplication.CreateBuilder(args);

// Add services to the container.
var connectionString = builder.Configuration.GetConnectionString("DefaultConnection");
builder.Services.AddDbContext<ApplicationDbContext>(options =>
    options.UseSqlServer(connectionString));
builder.Services.AddDatabaseDeveloperPageExceptionFilter();

builder.Services.AddDefaultIdentity<DefaultUser>(options => options.SignIn.RequireConfirmedAccount = true)
    .AddRoles<IdentityRole>()
    .AddEntityFrameworkStores<ApplicationDbContext>();

builder.Services.Configure<IdentityOptions>(options =>
{
    options.Lockout.MaxFailedAccessAttempts = 10;
    options.Lockout.DefaultLockoutTimeSpan = TimeSpan.FromMinutes(10);
});


builder.Services.Configure<Config>(builder.Configuration.GetSection("Config"));
builder.Services.AddControllersWithViews()
    .AddJsonOptions(options =>
    {
        options.JsonSerializerOptions.Converters.Add(new AntiXssConverter());
    });


builder.Services.AddTransient<IEmailSender, EmailService>();

var configuration = builder.Configuration;
builder.Services.AddAuthentication()
    .AddGoogle(googleOptions =>
    {
        googleOptions.ClientId = configuration["Authentication:Google:ClientId"];
        googleOptions.ClientSecret = configuration["Authentication:Google:ClientSecret"];
    })
    .AddFacebook(facebookOptions =>
    {
        facebookOptions.AppId = configuration["Authentication:Facebook:AppId"];
        facebookOptions.AppSecret = configuration["Authentication:Facebook:AppSecret"];
        facebookOptions.AccessDeniedPath = "/AccessDeniedPathInfo";

    });;

var app = builder.Build();

using (var scope = app.Services.CreateScope())
{
    var services = scope.ServiceProvider;
    try
    {
        var context = services.GetRequiredService<ApplicationDbContext>();
        DbInitializer.Initialize(context);
    }
    catch (Exception ex)
    {
        var logger = services.GetRequiredService<ILogger<Program>>();
        logger.LogError(ex, "An error occurred while seeding the database.");
    }
}

// Configure the HTTP request pipeline.
if (app.Environment.IsDevelopment())
{
    app.UseMigrationsEndPoint();
}
else
{
    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.UseAuthentication();
app.UseAuthorization();
app.UseMiddleware<AntiXssMiddleware>();

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

app.Run();