优化目录结构

backend/src/main/java/com/openisle/controller/SubscriptionController.java

@@ -0,0 +1,44 @@
+package com.openisle.controller;
+
+import com.openisle.service.SubscriptionService;
+import lombok.RequiredArgsConstructor;
+import org.springframework.security.core.Authentication;
+import org.springframework.web.bind.annotation.*;
+
+/** Endpoints for subscribing to posts, comments and users. */
+@RestController
+@RequestMapping("/api/subscriptions")
+@RequiredArgsConstructor
+public class SubscriptionController {
+    private final SubscriptionService subscriptionService;
+
+    @PostMapping("/posts/{postId}")
+    public void subscribePost(@PathVariable Long postId, Authentication auth) {
+        subscriptionService.subscribePost(auth.getName(), postId);
+    }
+
+    @DeleteMapping("/posts/{postId}")
+    public void unsubscribePost(@PathVariable Long postId, Authentication auth) {
+        subscriptionService.unsubscribePost(auth.getName(), postId);
+    }
+
+    @PostMapping("/comments/{commentId}")
+    public void subscribeComment(@PathVariable Long commentId, Authentication auth) {
+        subscriptionService.subscribeComment(auth.getName(), commentId);
+    }
+
+    @DeleteMapping("/comments/{commentId}")
+    public void unsubscribeComment(@PathVariable Long commentId, Authentication auth) {
+        subscriptionService.unsubscribeComment(auth.getName(), commentId);
+    }
+
+    @PostMapping("/users/{username}")
+    public void subscribeUser(@PathVariable String username, Authentication auth) {
+        subscriptionService.subscribeUser(auth.getName(), username);
+    }
+
+    @DeleteMapping("/users/{username}")
+    public void unsubscribeUser(@PathVariable String username, Authentication auth) {
+        subscriptionService.unsubscribeUser(auth.getName(), username);
+    }
+}