Spring boot 3.3 example for OIDC client registration, which does not require HTTP request to discovery endpoint during startup

OidcSecurityClient.java

@Configuration
@NoArgsConstructor
@AllArgsConstructor
public class OAuth2LoginConfig {

  @Value("${system.oauth2.client.id}")
  private String adminClientId;

  @Value("${system.oauth2.client.secret}")
  private String adminClientSecret;

  @Bean
  public ClientRegistrationRepository clientRegistrationRepository() {
    var configurations = List.of(adminClientRegistration());
    return new InMemoryClientRegistrationRepository(configurations);
  }

  private ClientRegistration adminClientRegistration() {
    return ClientRegistration.withRegistrationId(ADMIN_CLIENT_ID)
      .clientName(ADMIN_CLIENT_NAME)
      .scope("openid")
      .clientId(adminClientId)
      .clientSecret(adminClientSecret)
      .clientAuthenticationMethod(ClientAuthenticationMethod.CLIENT_SECRET_BASIC)
      .authorizationGrantType(AuthorizationGrantType.AUTHORIZATION_CODE)
      .redirectUri("{baseUrl}/login/oauth2/code/{registrationId}")
      .authorizationUri(adminClientUrl + "/protocol/openid-connect/auth")
      .tokenUri(adminClientUrl + "/protocol/openid-connect/token")
      .userInfoUri(adminClientUrl + "/protocol/openid-connect/userinfo")
      .userNameAttributeName(IdTokenClaimNames.SUB)
      .jwkSetUri(adminClientUrl + "/protocol/openid-connect/certs")
      .providerConfigurationMetadata(
        Map.of("end_session_endpoint", adminClientUrl + "/protocol/openid-connect/logout"))
      .build();
  }
}