feat(mikrotikBackupRoutes): add encryption and decryption for backup content to enhance security

backend/routes/mikrotikBackupRoutes.js

@@ -16,9 +16,24 @@ const { sendError, sendOk } = require('../middleware/errorHandler');
 const { writeS3TextObject, readS3TextObject, listS3Objects } = require('../services/s3Service');
 const { readServersFromS3 } = require('./serversRoutes');
 const { createRosClient, fetchExportViaFile } = require('../services/mikrotikApplyService');
-const { decrypt } = require('../utils/encryption');
+const { encrypt, decrypt } = require('../utils/encryption');
 
 const BACKUP_PREFIX = 'backups/mikrotik';
+const ENCRYPTED_PREFIX = 'ENC:';
+
+/** Расшифровать содержимое бэкапа (поддерживает старые незашифрованные) */
+function decryptBackupContent(raw) {
+  if (!raw || typeof raw !== 'string') return '';
+  if (raw.startsWith(ENCRYPTED_PREFIX)) {
+    try {
+      return decrypt(raw.slice(ENCRYPTED_PREFIX.length));
+    } catch (e) {
+      console.error('Backup decryption failed:', e?.message);
+      throw new Error(`Failed to decrypt backup: ${e?.message || 'decryption error'}`);
+    }
+  }
+  return raw;
+}
 
 function buildBackupKey(serverId, createdAt, suffix) {
   const safeId = String(serverId || 'unknown').replace(/[^a-zA-Z0-9._-]/g, '_');
@@ -44,7 +59,17 @@ async function saveBackupForServer(serverId, config, { source, comment } = {}) {
     '',
   ].filter(Boolean);
 
-  const content = `${headerLines.join('\n')}\n${String(config || '').replace(/^\uFEFF/, '')}`;
+  let content = `${headerLines.join('\n')}\n${String(config || '').replace(/^\uFEFF/, '')}`;
+
+  // Шифруем содержимое на S3, если задан ENCRYPTION_KEY
+  if (process.env.ENCRYPTION_KEY) {
+    try {
+      content = ENCRYPTED_PREFIX + encrypt(content);
+    } catch (e) {
+      console.error('Backup encryption failed:', e?.message);
+      throw new Error(`Failed to encrypt backup: ${e?.message || 'encryption error'}`);
+    }
+  }
 
   const meta = await writeS3TextObject(key, content, 'text/plain');
   return { key, createdAt: now.toISOString(), s3: meta };
@@ -132,11 +157,12 @@ async function getBackup(req, res) {
     }
 
     const data = await readS3TextObject(key);
+    const config = decryptBackupContent(data.body || '');
 
     return res.json({
       ok: true,
       key,
-      config: data.body || '',
+      config,
       etag: data.etag,
       lastModified: data.lastModified,
       contentLength: data.contentLength,
@@ -169,8 +195,8 @@ async function diffBackups(req, res) {
       readS3TextObject(keyB),
     ]);
 
-    const bodyA = a.body || '';
+    const bodyA = decryptBackupContent(a.body || '');
-    const bodyB = b.body || '';
+    const bodyB = decryptBackupContent(b.body || '');
 
     return res.json({
       ok: true,