Describe how you have applied the features of Keycloak in your projects.

In C# projects, I used Keycloak for centralized user authentication and authorization. The main functionalities I applied include:

• Integration via OpenID Connect to obtain access and refresh tokens.
• Setting up roles and groups in Keycloak to restrict access to APIs and web applications.
• Using Keycloak adapters for ASP.NET Core to automatically verify tokens and secure endpoints.

Example of middleware configuration in ASP.NET Core for verifying Keycloak tokens:

services.AddAuthentication(options => {
    options.DefaultAuthenticateScheme = JwtBearerDefaults.AuthenticationScheme;
    options.DefaultChallengeScheme = JwtBearerDefaults.AuthenticationScheme;
})
.AddJwtBearer(options => {
    options.Authority = "https://keycloak.example.com/auth/realms/myrealm";
    options.Audience = "my-client-id";
    options.RequireHttpsMetadata = false;
});

Thus, Keycloak allows centralized management of users and security without the need to develop a custom authorization mechanism.