如何从我的express路由器访问我的IPFS节点实例

npm install ipfs

const IPFS = require('ipfs');

const ipfs = new IPFS();

app.post('/upload', (req, res) => {
  const file = req.files.file;

  const reader = new FileReader();
  reader.onloadend = async () => {
    const buffer = Buffer.from(reader.result);

    try {
      const result = await ipfs.add(buffer);
      const ipfsHash = result.cid.toString();

      res.json({ ipfsHash });
    } catch (error) {
      console.error(error);
      res.status(500).json({ error: 'Failed to upload file to IPFS' });
    }
  };

  reader.readAsArrayBuffer(file.data);
});