source: iknow-api/Program.cs@ c0256f3

using System.Text;
using System.Text.Json.Serialization;
using iknow_api.Data;
using iknow_api.Repositories;
using iknow_api.Services;
using Microsoft.AspNetCore.Authentication.JwtBearer;
using Microsoft.EntityFrameworkCore;
using Microsoft.IdentityModel.Tokens;

var builder = WebApplication.CreateBuilder(args);
builder.Services.AddAuthentication(options =>
{
    options.DefaultAuthenticateScheme = JwtBearerDefaults.AuthenticationScheme;
    options.DefaultChallengeScheme = JwtBearerDefaults.AuthenticationScheme;
})
.AddJwtBearer(options =>
{
    options.RequireHttpsMetadata = false; // only for development
    options.SaveToken = true;
    options.TokenValidationParameters = new TokenValidationParameters
    {
        ValidateIssuer = true,
        ValidIssuer = "iknow-api",

        ValidateAudience = true,
        ValidAudience = "iknow-api",

        ValidateLifetime = true,

        ValidateIssuerSigningKey = true,
        IssuerSigningKey = new SymmetricSecurityKey(
            Encoding.UTF8.GetBytes(builder.Configuration["Jwt:Key"]))
    };
});
// Add services to the container.
builder.Services.AddControllers()
    .AddJsonOptions(options =>
    {
        options.JsonSerializerOptions.ReferenceHandler = ReferenceHandler.IgnoreCycles;
    });
builder.Services.AddOpenApi();

// Register DbContext
builder.Services.AddDbContext<AppDbContext>(options =>
    options.UseNpgsql(builder.Configuration.GetConnectionString("DefaultConnection")));

// Register your services
builder.Services.AddScoped<IAuthService, AuthService>();
builder.Services.AddScoped<IUserRepository, UserRepository>(); // You'll need to add the UserRepository implementation
builder.Services.AddScoped<IUserService, UserService>();

builder.Services.AddAuthorization();
var app = builder.Build();

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

app.UseHttpsRedirection();
app.UseAuthentication(); // <-- must come BEFORE UseAuthorization
app.UseAuthorization();
app.MapControllers();

app.Run();