添加了更多功能

middleware/permissions.js

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+// middleware/permissions.js —— RBAC 权限检查 + 数据范围过滤
+
+/**
+ * 检查当前用户是否拥有指定权限
+ * @param {string} resource - 资源名，如 'customer'
+ * @param {string} action   - 操作名，如 'read'
+ */
+function checkPermission(resource, action) {
+  return (req, res, next) => {
+    const permName = `${resource}:${action}`
+    if (!req.user || !req.user.permissions || !req.user.permissions.includes(permName)) {
+      return res.status(403).json({ code: 403, message: '权限不足' })
+    }
+    next()
+  }
+}
+
+/**
+ * 根据当前用户角色，返回该资源的数据范围过滤条件
+ * @param {object} user     - req.user（含 roleName, id, department）
+ * @param {string} resource - 资源名：customers / contracts / after_sales / products / suppliers / employees / users
+ * @returns {{ where?: string, values?: any[], deny?: boolean }}
+ *   - where + values：追加到 SQL WHERE 子句的条件
+ *   - deny：true 表示该角色无权访问此资源
+ */
+function getDataScope(user, resource) {
+  const { roleName, id: userId, department } = user
+
+  // admin 和 general_manager（总经理）：全量数据，无限制
+  if (roleName === 'admin' || roleName === 'general_manager') {
+    return {}
+  }
+
+  switch (resource) {
+    case 'customers':
+      if (roleName === 'finance') return {}
+      return { where: 'responsible_user_id = ?', values: [userId] }
+
+    case 'contracts':
+      if (roleName === 'finance') return {}
+      if (roleName === 'procurement_manager') {
+        return { where: 'c.type = ?', values: ['supply'] }
+      }
+      if (roleName === 'franchise_manager' || roleName === 'operations_manager') {
+        return { where: 'c.responsible_user_id = ? AND c.type = ?', values: [userId, 'franchise'] }
+      }
+      return {}
+
+    case 'after_sales':
+      if (roleName === 'finance') return {}
+      if (roleName === 'operations_manager') {
+        return { where: 'responsible_user_id = ?', values: [userId], tableAlias: 'a' }
+      }
+      // franchise_manager 和 procurement_manager 无权限（checkPermission 已拦截）
+      return {}
+
+    case 'employees':
+      if (roleName === 'finance') return {}
+      // 所有非管理员/总经理角色：只能看自己部门的员工
+      return { where: 'department = ?', values: [department] }
+
+    case 'products':
+    case 'suppliers':
+    case 'users':
+      // 无数据范围过滤，仅靠 checkPermission 控制访问
+      return {}
+
+    default:
+      return {}
+  }
+}
+
+module.exports = { checkPermission, getDataScope }