refactor: migrate entire project to TypeScript

middleware/auth.ts

@@ -0,0 +1,53 @@
+import jwt from 'jsonwebtoken';
+import { Request, Response, NextFunction } from 'express';
+import db from '../utils/database';
+import { AuthUser } from '../types';
+
+declare global {
+  namespace Express {
+    interface Request {
+      user?: AuthUser;
+    }
+  }
+}
+
+export const authenticateToken = async (req: Request, res: Response, next: NextFunction): Promise<void> => {
+  const authHeader = req.headers['authorization'];
+  const token = authHeader && authHeader.split(' ')[1];
+
+  if (!token) {
+    res.status(401).json({ error: '访问令牌缺失' });
+    return;
+  }
+
+  try {
+    const decoded = jwt.verify(token, process.env.JWT_SECRET!) as { userId: number; username: string; role: string };
+    
+    const user = await db.get(
+      'SELECT id, username, name, role FROM users WHERE id = ?',
+      [decoded.userId]
+    ) as AuthUser | undefined;
+    
+    if (!user) {
+      res.status(401).json({ error: '用户不存在' });
+      return;
+    }
+    
+    req.user = user;
+    next();
+  } catch (error: any) {
+    if (error.name === 'TokenExpiredError') {
+      res.status(401).json({ error: '令牌已过期' });
+      return;
+    }
+    res.status(403).json({ error: '无效的令牌' });
+  }
+};
+
+export const requireAdmin = (req: Request, res: Response, next: NextFunction): void => {
+  if (req.user?.role !== 'admin') {
+    res.status(403).json({ error: '需要管理员权限' });
+    return;
+  }
+  next();
+};