Describe your experience with the Keycloak authentication and authorization system.

In working with Keycloak, I used it to organize authentication and authorization in web applications using C#.

Key aspects of my experience include:

• Integration via OpenID Connect and OAuth 2.0 protocols.
• Configuring clients in Keycloak with redirect URIs and access rights.
• Using libraries such as Microsoft.AspNetCore.Authentication.OpenIdConnect to connect to Keycloak.
• Handling access and refresh tokens to maintain user sessions.
• Setting up roles and groups in Keycloak to restrict access within the application.

Example of authentication setup in ASP.NET Core:

services.AddAuthentication(options =>
{
    options.DefaultScheme = CookieAuthenticationDefaults.AuthenticationScheme;
    options.DefaultChallengeScheme = OpenIdConnectDefaults.AuthenticationScheme;
})
.AddCookie()
.AddOpenIdConnect(options =>
{
    options.Authority = "https://keycloak.example.com/auth/realms/myrealm";
    options.ClientId = "myclient";
    options.ClientSecret = "secret";
    options.ResponseType = "code";
    options.SaveTokens = true;
});

Thus, Keycloak allows centralized management of users and access rights, simplifying application security.