QuotifyBE/Program.cs

using Microsoft.AspNetCore.Authentication.JwtBearer;
using Microsoft.EntityFrameworkCore;
using Microsoft.IdentityModel.Tokens;
using QuotifyBE.Controllers;
using QuotifyBE.Data;
using System.Text;

var builder = WebApplication.CreateBuilder(args);

// Configure Database Connection
var connectionString = builder.Configuration.GetConnectionString("DefaultConnection")
    ?? throw new InvalidOperationException("Connection string 'DefaultConnection' not found.");
builder.Services.AddDbContext<ApplicationDbContext>(options =>
    options.UseNpgsql(connectionString));

var JwtSecret = builder.Configuration["JwtSecret"]
    ?? throw new InvalidOperationException("JWT token secret is not configured!!! Please configure JwtSecret in appsettings.json!");

var DomainName = builder.Configuration["DomainName"]
    ?? throw new InvalidOperationException("Domain name is not configured!!! Please configure DomainName in appsettings.json!");

// Configure JWT authentication
// https://medium.com/@solomongetachew112/jwt-authentication-in-net-8-a-complete-guide-for-secure-and-scalable-applications-6281e5e8667c
builder.Services.AddAuthentication(JwtBearerDefaults.AuthenticationScheme)
    .AddJwtBearer(options =>
    {
        options.TokenValidationParameters = new TokenValidationParameters
        {
            ValidateIssuer = true,
            ValidateAudience = true,
            ValidateLifetime = true,
            ValidateIssuerSigningKey = true,
            ValidIssuer = DomainName,
            ValidAudience = DomainName,
            IssuerSigningKey = new SymmetricSecurityKey(
                Encoding.UTF8.GetBytes(JwtSecret)
            )
        };
    });

// Add services to the container.
builder.Services.AddAuthorization();
builder.Services.AddSingleton(builder.Configuration);
builder.Services.AddScoped<GeneralUseHelpers>();

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();

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

app.UseHttpsRedirection();

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

app.MapControllers();

app.Run();