code: public static boolean currentUserHasRole(String... roles) {
      if (roles == null || roles.length == 0) return false;
  
      Authentication authentication = SecurityContextHolder.getContext().getAuthentication();
      if (authentication != null) {
        Collection<? extends GrantedAuthority> authorities = authentication.getAuthorities();
        if (authorities == null) throw new IllegalStateException("No user currently logged in");
  
        for (String role : roles) {
          for (GrantedAuthority grantedAuthority : authorities) {
            if (role.equals(grantedAuthority.getAuthority())) return true;
          }
        }
      }
      return false;
    }
docs: Returns whether the current user has at least one of the given roles