ADD user authentication checks for clip access

src/main/java/com/ddf/vodsystem/services/UserService.java

@@ -0,0 +1,18 @@
+package com.ddf.vodsystem.services;
+
+import com.ddf.vodsystem.entities.User;
+import com.ddf.vodsystem.security.CustomOAuth2User;
+import org.springframework.security.core.Authentication;
+import org.springframework.security.core.context.SecurityContextHolder;
+import org.springframework.stereotype.Service;
+
+@Service
+public class UserService {
+    public User getUser() {
+        Authentication auth = SecurityContextHolder.getContext().getAuthentication();
+        if (auth != null && auth.isAuthenticated() && auth.getPrincipal() instanceof CustomOAuth2User oAuth2user) {
+            return oAuth2user.getUser();
+        }
+        return null;
+    }
+}