first commit

server/routes/secondhand.js

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+import { Router } from 'express';
+import db from '../db.js';
+import { auth } from '../middleware.js';
+
+const router = Router();
+
+// 二手闲置列表
+router.get('/', auth, (req, res) => {
+  const items = db
+    .prepare('SELECT s.*, u.nickname, u.avatar FROM secondhand s JOIN users u ON s.user_id = u.id ORDER BY s.created_at DESC')
+    .all();
+  res.json(items.map(i => ({ ...i, images: JSON.parse(i.images || '[]') })));
+});
+
+// 发布闲置
+router.post('/', auth, (req, res) => {
+  const { title, description, price, images } = req.body;
+  if (!title || !description) {
+    return res.status(400).json({ message: '请填写标题和描述' });
+  }
+  const info = db
+    .prepare('INSERT INTO secondhand (user_id, title, description, price, images) VALUES (?, ?, ?, ?, ?)')
+    .run(req.user.id, title, description, price || 0, JSON.stringify(images || []));
+  res.json(db.prepare('SELECT * FROM secondhand WHERE id = ?').get(info.lastInsertRowid));
+});
+
+// 更新状态（下架/售出）
+router.put('/:id', auth, (req, res) => {
+  const item = db.prepare('SELECT * FROM secondhand WHERE id = ?').get(req.params.id);
+  if (!item) return res.status(404).json({ message: '物品不存在' });
+  if (item.user_id !== req.user.id && req.user.role !== 'admin') {
+    return res.status(403).json({ message: '无权操作' });
+  }
+  const { status } = req.body;
+  db.prepare('UPDATE secondhand SET status = ? WHERE id = ?').run(status, req.params.id);
+  res.json(db.prepare('SELECT * FROM secondhand WHERE id = ?').get(req.params.id));
+});
+
+// 删除闲置
+router.delete('/:id', auth, (req, res) => {
+  const item = db.prepare('SELECT * FROM secondhand WHERE id = ?').get(req.params.id);
+  if (!item) return res.status(404).json({ message: '物品不存在' });
+  if (item.user_id !== req.user.id && req.user.role !== 'admin') {
+    return res.status(403).json({ message: '无权删除' });
+  }
+  db.prepare('DELETE FROM secondhand WHERE id = ?').run(req.params.id);
+  res.json({ message: '删除成功' });
+});
+
+export default router;