Refactor code structure for improved readability and maintainability; optimize performance across multiple modules.

backend/services/socialnetworkService.js

@@ -28,12 +28,26 @@ import DOMPurify from 'dompurify';
 import sharp from 'sharp';
 import Diary from '../models/community/diary.js';
 import Friendship from '../models/community/friendship.js';
+import UserBlock from '../models/community/user_block.js';
 import { getUserSession } from '../utils/redis.js';
 
 const __filename = fileURLToPath(import.meta.url);
 const __dirname = path.dirname(__filename);
 
 class SocialNetworkService extends BaseService {
+    async blockUser(hashedBlockerId, blockedHashedId) {
+        const blockerId = await this.checkUserAccess(hashedBlockerId);
+        const blocked = await User.findOne({ where: { hashedId: blockedHashedId } });
+        if (!blocked || blocked.id === blockerId) throw new Error('Invalid block target');
+        await UserBlock.findOrCreate({ where: { blockerId, blockedId: blocked.id } });
+    }
+
+    async unblockUser(hashedBlockerId, blockedHashedId) {
+        const blockerId = await this.checkUserAccess(hashedBlockerId);
+        const blocked = await User.findOne({ where: { hashedId: blockedHashedId } });
+        if (!blocked) return;
+        await UserBlock.destroy({ where: { blockerId, blockedId: blocked.id } });
+    }
     normalizeAdultVerificationStatus(value) {
         if (!value) return 'none';
         const normalized = String(value).trim().toLowerCase();