Extract Keycloak Principal in spring boot 3 using oauth

Question

is there any way to extract Keycloak Principal in spring boot 3 using oauth?

With older version we accessed like below,

 KeycloakAuthenticationToken authentication;
  try {
     authentication =
             (KeycloakAuthenticationToken) SecurityContextHolder.getContext().getAuthentication();
  } catch (ClassCastException exception) {
     throw new UnauthorizedException("Missing token");
  }
  Principal principal = (Principal) authentication.getPrincipal();

Does this answer your question? [Use Keycloak Spring Adapter with Spring Boot 3](https://stackoverflow.com/questions/74571191/use-keycloak-spring-adapter-with-spring-boot-3) — ch4mp, Mar 20 '23 at 09:17

Chetan Ahirrao · Answer 1 · 2023-03-20T09:26:29.607

0

Keycloak's legacy API is already deprecated. You don't need KeycloakAuthenticationToken for extracting principal. Use standard spring oauth2 code like

        Authentication authentication = SecurityContextHolder.getContext().getAuthentication();
        if(authentication !=null) {
          Principal principal = (Principal) authentication.getPrincipal();
        }

edited Mar 20 '23 at 09:26

answered Mar 20 '23 at 07:22

Chetan Ahirrao

1,454
11
16

1

Actually, it's not "I think", it's "it was a year ago". Adapters are not compatible with Boot 3 at all. https://stackoverflow.com/questions/74571191/use-keycloak-spring-adapter-with-spring-boot-3 – ch4mp Mar 20 '23 at 09:23
removed I think :) – Chetan Ahirrao Mar 20 '23 at 09:26

score 0 · Accepted Answer · answered Apr 12 '23 at 13:03

public final static String TOKEN_CLAIM_NAME = "preferred_username";                                                                                                  
Authentication authToken = SecurityContextHolder.getContext().getAuthentication();
Map<String, Object> attributes = Collections.emptyMap();
attributes = ((JwtAuthenticationToken) authToken).getTokenAttributes();
String userName = (String) attributes.get(TOKEN_CLAIM_NAME);

Extract Keycloak Principal in spring boot 3 using oauth

2 Answers2