备份：修复前完整项目快照 2026-04-19

backend/utils/auth.js

@@ -0,0 +1,74 @@
+// 认证工具函数
+const bcrypt = require('bcryptjs');
+const jwt = require('jsonwebtoken');
+
+// JWT 密钥（生产环境应从环境变量读取）
+const JWT_SECRET = process.env.JWT_SECRET || 'your-jwt-secret-change-in-production';
+const JWT_EXPIRES_IN = process.env.JWT_EXPIRES_IN || '24h';
+
+/**
+ * 密码哈希
+ * @param {string} password - 明文密码
+ * @returns {string} - 哈希后的密码
+ */
+function hashPassword(password) {
+  const saltRounds = 12; // 推荐值：10-14
+  return bcrypt.hashSync(password, saltRounds);
+}
+
+/**
+ * 验证密码
+ * @param {string} password - 明文密码
+ * @param {string} hash - 数据库中的哈希密码
+ * @returns {boolean} - 是否匹配
+ */
+function verifyPassword(password, hash) {
+  return bcrypt.compareSync(password, hash);
+}
+
+/**
+ * 生成 JWT Token
+ * @param {object} payload - token 载荷 { id, username, role }
+ * @returns {string} - JWT token
+ */
+function generateToken(payload) {
+  return jwt.sign(payload, JWT_SECRET, {
+    expiresIn: JWT_EXPIRES_IN,
+    issuer: 'company-finance-system',
+    audience: 'company-finance-client'
+  });
+}
+
+/**
+ * 验证 JWT Token
+ * @param {string} token - JWT token
+ * @returns {object|null} - 解码后的 payload 或 null
+ */
+function verifyToken(token) {
+  try {
+    return jwt.verify(token, JWT_SECRET);
+  } catch (error) {
+    return null;
+  }
+}
+
+/**
+ * 从请求头中提取 token
+ * @param {object} req - Express 请求对象
+ * @returns {string|null} - token 或 null
+ */
+function extractToken(req) {
+  const authHeader = req.headers.authorization;
+  if (authHeader && authHeader.startsWith('Bearer ')) {
+    return authHeader.substring(7);
+  }
+  return null;
+}
+
+module.exports = {
+  hashPassword,
+  verifyPassword,
+  generateToken,
+  verifyToken,
+  extractToken
+};

backend/utils/index.js

@@ -0,0 +1,16 @@
+const { body, validationResult } = require('express-validator');
+
+const validate = (req, res, next) => {
+  const errors = validationResult(req);
+  if (!errors.isEmpty()) {
+    return res.status(400).json({ 
+      success: false, 
+      errors: errors.array() 
+    });
+  }
+  next();
+};
+
+module.exports = {
+  validate
+};