Fix performance

src/main/java/com/darkfantasy/util/SecurityUtil.java

@@ -13,7 +13,9 @@ import lombok.experimental.UtilityClass;
 public class SecurityUtil {
     public String getCurrentUserName() {
         Authentication authentication = SecurityContextHolder.getContext().getAuthentication();
-        if (authentication == null || !authentication.isAuthenticated()) {
+        if (authentication == null
+                || !authentication.isAuthenticated()
+                || authentication instanceof AnonymousAuthenticationToken) {
             return null;
         }
         return authentication.getName();