refactoring - after adding the scope openind, the principal is now an OidcUser which extends from Oauth2User

Author: rcsoyer

src/main/java/org/acme/authorization_server/application/web/LoginSuccessHandler.java

@@ -8,7 +8,7 @@
 import lombok.extern.slf4j.Slf4j;
 import org.acme.authorization_server.domain.service.SecurityService;
 import org.springframework.security.core.Authentication;
-import org.springframework.security.oauth2.core.user.OAuth2User;
+import org.springframework.security.oauth2.core.oidc.user.OidcUser;
 import org.springframework.security.web.authentication.SavedRequestAwareAuthenticationSuccessHandler;
 import org.springframework.stereotype.Component;
 
@@ -24,7 +24,7 @@ public void onAuthenticationSuccess(final HttpServletRequest request,
                                         final HttpServletResponse response,
                                         final Authentication authentication)
       throws ServletException, IOException {
-        final String userName = ((OAuth2User) authentication.getPrincipal()).getAttribute("email");
+        final String userName = ((OidcUser) authentication.getPrincipal()).getEmail();
         securityService.setAuthenticationContext(userName);
         super.onAuthenticationSuccess(request, response, authentication);
     }