来自外部URL的Express - download文件

const express = require('express');
const axios = require('axios');
const fs = require('fs');

const app = express();

app.get('/download', async (req, res) => {
  const url = req.query.url; // 从请求参数中获取外部URL
  const filename = req.query.filename; // 从请求参数中获取文件名

  try {
    const response = await axios.get(url, { responseType: 'stream' });
    const filePath = `./downloads/${filename}`; // 指定保存文件的路径和文件名

    response.data.pipe(fs.createWriteStream(filePath)); // 将响应数据流写入文件

    response.data.on('end', () => {
      res.download(filePath); // 下载保存的文件
    });
  } catch (error) {
    console.error(error);
    res.status(500).send('Error downloading file');
  }
});

app.listen(3000, () => {
  console.log('Server is running on port 3000');
});