backend/Program.cs

using System.Text;
using backend.Models;
using backend.Services;
using Microsoft.AspNetCore.Authentication.JwtBearer;
using Microsoft.IdentityModel.Tokens;
using Microsoft.OpenApi.Models;

var builder = WebApplication.CreateBuilder(args);

// Add services to the container.

builder.Services.Configure<BlogDatabaseSettings>(builder.Configuration.GetSection("BlogDatabase"));


builder.Services.AddSingleton<UserService>();
builder.Services.AddSingleton<BlogPostService>();

builder.Services.AddControllers();

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

// Learn more about configuring Swagger/OpenAPI at https://aka.ms/aspnetcore/swashbuckle
builder.Services.AddEndpointsApiExplorer();
builder.Services.AddSwaggerGen(c =>
{
    c.SwaggerDoc("v1", new OpenApiInfo { Title = "WebServer", Version = "v1" });

    // We need to tell swagger that we want to support authentication
    c.AddSecurityDefinition("Bearer", new OpenApiSecurityScheme()
    {
        Name = "Authorization",
        Type = SecuritySchemeType.Http,
        Scheme = "Bearer",
        In = ParameterLocation.Header,
        BearerFormat = "Bearer",
        Description = "The Bearer token needed to access the initial part of the api.",
    });

    // And again since once is not enough?
    c.AddSecurityRequirement(new OpenApiSecurityRequirement
    {
        {
            new OpenApiSecurityScheme
            {
                Reference = new OpenApiReference
                {
                    Type = ReferenceType.SecurityScheme,
                    Id = "Bearer",
                },
            },
            Array.Empty<string>()
        },
    });
});

var app = builder.Build();

// Configure the HTTP request pipeline.
if (app.Environment.IsDevelopment())
{
    app.UseStaticFiles();
    app.UseSwagger();
    app.UseSwaggerUI(c => c.InjectStylesheet("/swagger-ui/darkMode.css"));
}

app.UseHttpsRedirection();

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

app.MapControllers();

app.Run();