Security

Authentication & Authorization

By default, the FactCast-Server UI supports the same authentication/authorization approach as the gRPC server explained here.

However, you might want to make UI accessible via a centrally managed Active Directory. Luckily, we use Spring Security under the hood and all this is possible.

OIDC Example

The following example shows an OIDC integration:

You have to exclude the standard configuration, that configures Spring Security & Vaadin to support the default authentication/authorization approach.
```
@SpringBootApplication(exclude = {FactCastServerUISecurityAutoConfiguration.class})
```

Add necessary Spring Security dependencies and configurations:

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-oauth2-client</artifactId>
</dependency>
<dependency>
    <groupId>org.springframework.security</groupId>
    <artifactId>spring-security-oauth2-jose</artifactId>
</dependency>

Implement custom security configuration

@Configuration
@EnableWebSecurity
public class SecurityConfig extends VaadinWebSecurity {
  @Override
  protected void configure(HttpSecurity http) throws Exception {
    http.oauth2Login(Customizer.withDefaults()); // enable oauth2 login
    super.configure(http);
  }
}

Implement a OAuth2UserService that maps from a OidcUser to a FactCastOidcUser which is usable by the FactCast-Server UI.

@Component
public class FactCastUserService implements OAuth2UserService<OidcUserRequest, OidcUser> {
  private final OidcUserService oidcUserService = new OidcUserService();

  @Override
  public OidcUser loadUser(OidcUserRequest userRequest) throws OAuth2AuthenticationException {
    // that gives you a fully authenticated user via your OAuth/OIDC provider
    OidcUser user = oidcUserService.loadUser(userRequest);

    // either create the account yourself or reuse factcast-access.json here
    FactCastAccount account = new FactCastAccount(user.getEmail(), List.of());

    return new FactCastOidcUser(account, "unused", user);
  }
}

with this being the FactCastOidcUser

public class FactCastOidcUser extends FactCastUser implements OidcUser {
  private final OidcUser user;

  public FactCastOidcUser(FactCastAccount account, String secret, OidcUser user) {
    super(account, secret);
    this.user = user;
  }

  @Override
  public Map<String, Object> getClaims() {
    return user.getClaims();
  }

  @Override
  public OidcUserInfo getUserInfo() {
    return user.getUserInfo();
  }

  @Override
  public OidcIdToken getIdToken() {
    return user.getIdToken();
  }

  @Override
  public Map<String, Object> getAttributes() {
    return user.getAttributes();
  }

  @Override
  public String getName() {
    return user.getName();
  }
}