优化目录结构

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

@@ -0,0 +1,44 @@
+package com.openisle.service;
+
+import com.openisle.model.PushSubscription;
+import com.openisle.model.User;
+import com.openisle.repository.PushSubscriptionRepository;
+import lombok.extern.slf4j.Slf4j;
+import nl.martijndwars.webpush.Notification;
+import nl.martijndwars.webpush.PushService;
+import org.bouncycastle.jce.provider.BouncyCastleProvider;
+import org.jose4j.lang.JoseException;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.stereotype.Service;
+
+import java.io.IOException;
+import java.security.GeneralSecurityException;
+import java.security.Security;
+import java.util.List;
+
+@Slf4j
+@Service
+public class PushNotificationService {
+    private final PushSubscriptionRepository subscriptionRepository;
+    private final PushService pushService;
+
+    public PushNotificationService(PushSubscriptionRepository subscriptionRepository,
+                                   @Value("${app.webpush.public-key}") String publicKey,
+                                   @Value("${app.webpush.private-key}") String privateKey) throws GeneralSecurityException {
+        this.subscriptionRepository = subscriptionRepository;
+        Security.addProvider(new BouncyCastleProvider());
+        this.pushService = new PushService(publicKey, privateKey);
+    }
+
+    public void sendNotification(User user, String payload) {
+        List<PushSubscription> subs = subscriptionRepository.findByUser(user);
+        for (PushSubscription sub : subs) {
+            try {
+                Notification notification = new Notification(sub.getEndpoint(), sub.getP256dh(), sub.getAuth(), payload);
+                pushService.send(notification);
+            } catch (GeneralSecurityException | IOException | JoseException | InterruptedException | java.util.concurrent.ExecutionException e) {
+                log.error(e.getMessage());
+            }
+        }
+    }
+}