后端: 添加JWT认证中间件

backend/src/middleware/auth.js

@@ -0,0 +1,14 @@
+const jwt = require('jsonwebtoken');
+
+const JWT_SECRET = process.env.JWT_SECRET || 'clouddisk-secret-key';
+const JWT_EXPIRES_IN = '7d';
+
+const generateToken = (payload) => {
+  return jwt.sign(payload, JWT_SECRET, { expiresIn: JWT_EXPIRES_IN });
+};
+
+const verifyToken = (token) => {
+  return jwt.verify(token, JWT_SECRET);
+};
+
+module.exports = { generateToken, verifyToken, JWT_SECRET };