优化目录结构

backend/src/main/java/com/openisle/service/PushSubscriptionService.java

@@ -0,0 +1,35 @@
+package com.openisle.service;
+
+import com.openisle.model.PushSubscription;
+import com.openisle.model.User;
+import com.openisle.repository.PushSubscriptionRepository;
+import com.openisle.repository.UserRepository;
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+import java.util.List;
+
+@Service
+@RequiredArgsConstructor
+public class PushSubscriptionService {
+    private final PushSubscriptionRepository subscriptionRepository;
+    private final UserRepository userRepository;
+
+    @Transactional
+    public void saveSubscription(String username, String endpoint, String p256dh, String auth) {
+        User user = userRepository.findByUsername(username)
+                .orElseThrow(() -> new com.openisle.exception.NotFoundException("User not found"));
+        subscriptionRepository.deleteByUserAndEndpoint(user, endpoint);
+        PushSubscription sub = new PushSubscription();
+        sub.setUser(user);
+        sub.setEndpoint(endpoint);
+        sub.setP256dh(p256dh);
+        sub.setAuth(auth);
+        subscriptionRepository.save(sub);
+    }
+
+    public List<PushSubscription> listByUser(User user) {
+        return subscriptionRepository.findByUser(user);
+    }
+}