I've created a Spring Boot app which contains several examples of how to interact with Keycloak Java API. The app contains a REST controller with basic users and roles operations.
The purpose of it is to show how to use the Keycloak APIs, by providing basic examples as below.
Run the Spring Boot app using Maven
mvn spring-boot:run- create, read, update and delete users
Sample for get users
public List<UserRepresentation> getUsers() {
Keycloak keycloak = getKeycloakInstance();
List<UserRepresentation> userRepresentations = keycloak.realm(keycloakRealm).users().list();
return userRepresentations;
}- get the available roles
public ResponseEntity<List<RoleRepresentation>> getRoles() {
Keycloak keycloak = getKeycloakInstance();
ClientRepresentation clientRepresentation = keycloak.realm(keycloakRealm).clients().findByClientId(keycloakClient).get(0);
List<RoleRepresentation> roles = keycloak.realm(keycloakRealm).clients().get(clientRepresentation.getId()).roles().list();
return ResponseEntity.ok(roles);
}- get roles for user
public ResponseEntity<List<RoleRepresentation>> getRolesByUser(@RequestParam String username) {
Keycloak keycloak = getKeycloakInstance();
Optional<UserRepresentation> user = keycloak.realm(keycloakRealm).users().search(username).stream()
.filter(u -> u.getUsername().equals(username)).findFirst();
if (user.isPresent()) {
UserRepresentation userRepresentation = user.get();
UserResource userResource = keycloak.realm(keycloakRealm).users().get(userRepresentation.getId());
ClientRepresentation clientRepresentation = keycloak.realm(keycloakRealm).clients().findByClientId(keycloakClient).get(0);
List<RoleRepresentation> roles = userResource.roles().clientLevel(clientRepresentation.getId()).listAll();
return ResponseEntity.ok(roles);
} else {
return ResponseEntity.badRequest().build();
}
}
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