Program.cs

using Microsoft.AspNetCore.Builder;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using Microsoft.AspNetCore.Authentication.JwtBearer;
using Microsoft.IdentityModel.Tokens;
using Microsoft.AspNetCore.Routing;
using System.Text;

var builder = WebApplication.CreateBuilder(args);

//--------------------------------------------------//
//                     CORS                          //
//--------------------------------------------------//
builder.Services.AddCors(options =>
{
    options.AddPolicy("AllowFrontend", policy =>
        policy.AllowAnyOrigin().AllowAnyHeader().AllowAnyMethod());
});

//--------------------------------------------------//
//                 CONTROLLERS                       //
//--------------------------------------------------//
builder.Services.AddControllers();

//--------------------------------------------------//
//                 JWT AUTHENTICATION                //
//--------------------------------------------------//
builder.Services.AddAuthentication(JwtBearerDefaults.AuthenticationScheme)
    .AddJwtBearer(options =>
    {
        var key = Encoding.UTF8.GetBytes(builder.Configuration["Jwt:Key"] ?? throw new InvalidOperationException("Jwt:Key missing"));
        options.TokenValidationParameters = new TokenValidationParameters
        {
            ValidateIssuer = true,
            ValidateAudience = true,
            ValidateLifetime = true,
            ValidateIssuerSigningKey = true,
            ValidIssuer = builder.Configuration["Jwt:Issuer"],
            ValidAudience = builder.Configuration["Jwt:Audience"],
            IssuerSigningKey = new SymmetricSecurityKey(key)
        };
    });

var app = builder.Build();

//--------------------------------------------------//
//                  MIDDLEWARE                       //
//--------------------------------------------------//
app.UseCors("AllowFrontend");
// app.UseHttpsRedirection(); // optional for Cloud Run
app.UseAuthentication();
app.UseAuthorization();

//--------------------------------------------------//
//                  ENDPOINTS                        //
//--------------------------------------------------//
app.MapControllers();

var endpoints = app.Services.GetRequiredService<EndpointDataSource>();
Console.WriteLine("==== Registered Endpoints ====");
foreach (var e in endpoints.Endpoints)
{
    Console.WriteLine(e.DisplayName);
}
Console.WriteLine("==== End of List ====");

//--------------------------------------------------//
//           LOG REGISTERED ENDPOINTS               //
//--------------------------------------------------//
var dataSource = app.Services.GetRequiredService<EndpointDataSource>();
Console.WriteLine("Registered endpoints:");
foreach (var endpoint in dataSource.Endpoints)
{
    Console.WriteLine(endpoint.DisplayName);
}

//--------------------------------------------------//
//           LISTEN ON CLOUD RUN PORT               //
//--------------------------------------------------//
var port = Environment.GetEnvironmentVariable("PORT") ?? "8080";
app.Urls.Add($"http://0.0.0.0:{port}");


app.Run();