Draft: Resolve "SAML token as OIDC token needs improvements"

Related to #257 (closed)

src/main/java/net/geant/nmaas/portal/api/auth/OIDCAuthController.java

@@ -44,6 +44,11 @@ public class OIDCAuthController {
                 .orElseThrow()
                 : registerNewUser(oidcUser);
 
+        if (user.getSamlToken().equals(oidcUser.getAttribute("preferred_username"))) {
+            user.setSamlToken(oidcUser.getAttribute("sub"));
+            userService.update(user);
+        }
+
         String redirectUrl = portalAddress
                 + "/login-success?token="
                 + jwtTokenService.getToken(user)