Program.cs

using FlightMicroservice.Models;
using FlightMicroservice.Services;
using Microsoft.AspNetCore.Authentication.JwtBearer;
using Microsoft.EntityFrameworkCore;
using Microsoft.IdentityModel.Tokens;
using System.Text;
using System.Text.Json.Serialization;

var builder = WebApplication.CreateBuilder(args);

builder.Services.AddControllers().AddJsonOptions(options =>
{
    options.JsonSerializerOptions.ReferenceHandler = ReferenceHandler.Preserve;
});

builder.Services.AddEndpointsApiExplorer();
builder.Services.AddSwaggerGen();

builder.Services.AddDbContext<ApplicationDbContext>(options =>
    options.UseMySql(builder.Configuration.GetConnectionString("DefaultConnection"),
    new MariaDbServerVersion(new Version(10, 4, 20))));

builder.Services.AddAuthentication(JwtBearerDefaults.AuthenticationScheme)
    .AddJwtBearer(options =>
    {
        options.TokenValidationParameters = new TokenValidationParameters
        {
            ValidateIssuerSigningKey = true,
            IssuerSigningKey = new SymmetricSecurityKey(Encoding.UTF8.GetBytes(builder.Configuration["Jwt:Key"])),
            ValidateIssuer = true,
            ValidateAudience = true,
            ValidIssuer = builder.Configuration["Jwt:Issuer"],
            ValidAudience = builder.Configuration["Jwt:Audience"]
        };
    });

// Dependency injections
builder.Services.AddScoped<IFlightService, FlightService>();
builder.Services.AddScoped<ISeatService, SeatService>();

var app = builder.Build();

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

app.UseHttpsRedirection();

// Middleware for handling the access token in cookies
app.Use(async (context, next) =>
{
    var accessToken = context.Request.Cookies["AccessToken"];
    if (!string.IsNullOrEmpty(accessToken))
    {
        if (!context.Request.Headers.ContainsKey("Authorization"))
        {
            context.Request.Headers.Append("Authorization", "Bearer " + accessToken);
        }
    }

    await next();
});

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

app.MapControllers();

app.Run();