var builder = WebApplication.CreateBuilder(args);

var host = builder.Host;
var configuration = builder.Configuration;
var services = builder.Services;

host.ConfigureKeycloakConfigurationSource();
// conventional registration from keycloak.json
services.AddKeycloakAuthentication(configuration);

services.AddAuthorization(options =>
    {
        options.AddPolicy("RequireWorkspaces", builder =>
        {
            builder.RequireProtectedResource("workspaces", "workspaces:read") // HTTP request to Keycloak to check protected resource
                .RequireRealmRoles("User") // Realm role is fetched from token
                .RequireResourceRoles("Admin"); // Resource/Client role is fetched from token
        });
    })
    .AddKeycloakAuthorization(configuration);

var app = builder.Build();

app.UseAuthentication()
    .UseAuthorization();

app.MapGet("/workspaces", () => "[]")
    .RequireAuthorization("RequireWorkspaces");

app.Run();

// add configuration from keycloak file
host.ConfigureKeycloakConfigurationSource("keycloak.json");
// add authentication services, OICD JwtBearerDefaults.AuthenticationScheme
services.AddKeycloakAuthentication(configuration, o =>
{
    o.RequireHttpsMetadata = false;
});

services.AddAuthorization(authOptions =>
{
    authOptions.AddPolicy("<policyName>", policyBuilder =>
    {
        // configure policies here
    });
}).AddKeycloakAuthorization(configuration);

// requires confidential client
services.AddKeycloakAdminHttpClient(keycloakOptions);

// based on token forwarding HttpClient middleware and IHttpContextAccessor
services.AddKeycloakProtectionHttpClient(keycloakOptions);