如何在AWS S3中上传图像缓冲区数据？

let image = { "type": "Buffer", "data": [45, 45, 45....]

let buf = new Buffer(image )

let params = {
  Bucket: "bucketName",
  Key: "TestImage123haha.PNG",
  Body: buf ,
  ACL: 'public-read',
  ContentType: 'image/jpeg'
};

s3.upload(params, function(err, data) {
  if (err) {
    console.log('ERROR MSG: ', err);
  } else {
    console.log('Successfully uploaded data' + data.Location);
  }
})