Program.cs

using System.Text;
using Microsoft.AspNetCore.Authentication.JwtBearer;
using Microsoft.AspNetCore.Identity;
using Microsoft.EntityFrameworkCore;
using Microsoft.IdentityModel.Tokens;
using NetCorePress.Authentication;
using NetCorePress.Services.Repositories;
using NetCorePress.Services.Repositories.Interfaces;
using NetCorePress.Services.Seeders;

var myPolicy = "myPolicy";
var builder = WebApplication.CreateBuilder(args);
ConfigurationManager configuration = builder.Configuration;

//** Add services **//

// Added database
builder.Services.AddDbContext<ApplicationDbContext>(options => options.UseSqlServer(configuration.GetConnectionString("ConnStr")));

builder.Services.AddScoped<IPostRepository, PostRepository>();
builder.Services.AddScoped<ICommentRepository, CommentRepository>();
builder.Services.AddScoped<IImageRepository, ImageRepository>();
builder.Services.AddTransient<DBSeeder>();

builder.Services.AddCors(options =>
{
    options.AddPolicy(name: myPolicy,
        policy =>
        {
            policy.WithOrigins("http://localhost:3000")
                .AllowAnyHeader()
                .WithMethods("DELETE", "GET", "POST", "PATCH", "PUT");
        });
});

// For Identity
builder.Services.AddIdentity<ApplicationUser, IdentityRole>()
    .AddEntityFrameworkStores<ApplicationDbContext>()
    .AddDefaultTokenProviders();

builder.Services.AddHttpContextAccessor();

// Adding Authentication
builder.Services.AddAuthentication(options =>
{
    options.DefaultAuthenticateScheme = JwtBearerDefaults.AuthenticationScheme;
    options.DefaultChallengeScheme = JwtBearerDefaults.AuthenticationScheme;
    options.DefaultScheme = JwtBearerDefaults.AuthenticationScheme;
})

// Adding Jwt Bearer
.AddJwtBearer(options =>
{
    options.SaveToken = true;
    options.RequireHttpsMetadata = false;
    options.TokenValidationParameters = new TokenValidationParameters()
    {
        ValidateIssuer = true,
        ValidateAudience = true,
        ValidateLifetime = true,
        ValidateIssuerSigningKey = true,
        ValidAudience = configuration["JWT:ValidAudience"],
        ValidIssuer = configuration["JWT:ValidIssuer"],
        IssuerSigningKey = new SymmetricSecurityKey(Encoding.UTF8.GetBytes(configuration["JWT:Secret"]))
    };
});

builder.Services.AddAuthorization();
builder.Services.AddControllers();
// Learn more about configuring Swagger/OpenAPI at https://aka.ms/aspnetcore/swashbuckle
builder.Services.AddEndpointsApiExplorer();
builder.Services.AddSwaggerGen();

var app = builder.Build();

// add seeder
using (var scope = app.Services.CreateScope())
{
    var serviceProvider = scope.ServiceProvider;
    var DBSeeder = scope.ServiceProvider.GetRequiredService<DBSeeder>();
    await DBSeeder.Seed();
}

// Configure the HTTP request pipeline.
if (app.Environment.IsDevelopment())
{
    app.UseSwagger();
    app.UseSwaggerUI();
}

app.UseHttpsRedirection();

app.UseCors(myPolicy);

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


app.MapControllers();

app.Run();