Program.cs

using Backend;
using Microsoft.EntityFrameworkCore;
using Microsoft.AspNetCore.Identity;
using Microsoft.IdentityModel.Tokens;
using Microsoft.AspNetCore.Authentication.JwtBearer;
using Microsoft.AspNetCore.Identity.UI.Services;
using Backend.Services;

var builder = WebApplication.CreateBuilder(args);

// Add services to the container.

builder.Services.AddControllersWithViews();

// builder.Services.AddDbContext<DatabaseContext>(options => options.UseSqlite("Data Source=database.db"));
builder.Services.AddDbContext<DatabaseContext>(options => options.UseSqlite(builder.Configuration.GetConnectionString("DefaultSQLiteConnection")));

builder.Services.AddTransient<IEmailSender, EmailSender>();
builder.Services.Configure<AuthMessageSenderOptions>(builder.Configuration);

builder.Services.AddIdentity<Gebruiker, IdentityRole>()
                .AddEntityFrameworkStores<DatabaseContext>()
                .AddDefaultTokenProviders();

builder.Services.AddAuthentication(opt =>
{
    opt.DefaultAuthenticateScheme = JwtBearerDefaults.AuthenticationScheme;
    opt.DefaultChallengeScheme = JwtBearerDefaults.AuthenticationScheme;
}).AddJwtBearer(opt =>
{
    opt.TokenValidationParameters = new Microsoft.IdentityModel.Tokens.TokenValidationParameters
    {
        ValidateIssuer = true,
        ValidateAudience = true,
        ValidateLifetime = true,
        ValidateIssuerSigningKey = true,
        ValidIssuer = "https://localhost:7047",
        ValidAudience = "https://localhost:7047",
        IssuerSigningKey = new SymmetricSecurityKey(System.Text.Encoding.UTF8.GetBytes("awef98awef978haweof8g7aw789efhh789awef8h9awh89efh89awe98f89uawef9j8aw89hefawef"))
    };
});

builder.Services.AddAuthentication();

var app = builder.Build();

// Configure the HTTP request pipeline.
if (!app.Environment.IsDevelopment())
{
    // The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts.
    app.UseHsts();
}

app.UseHttpsRedirection();
app.UseStaticFiles();
app.UseRouting();

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


app.MapControllerRoute(
    name: "default",
    pattern: "{controller}/{action=Index}/{id?}");

app.MapFallbackToFile("index.html");

app.Run();