Node.js 上载的AWS S3图像已损坏

上载图像时，如果我使用req.file.buffer（一个数字数组）中的数据。。缓冲区。它将图像正确上传到aws s3

但是我需要在…之前调整图像的大小。。。所以我试着用jimp，就像这样：

const photo = await jimp.read(req.file.buffer)

await photo.cover(300, 300);

然后将其传递到aws设置：

  const s3 = new AWS.S3()

  const params = {
    Bucket: 'jamsession-images',
    Key: req.body.photo,
    // here in body is a buffer just like the one in req.file.buffer
    Body: photo.bitmap.data 
  };

  s3.upload(params, function (err, data) {
    if (err) {
      console.log(err);
    }
    console.log('****************** success');
  });

但是如果我这么做。。它将图像上传到aws s3。。但是图像被破坏了

我在这里干什么？我想aws s3需要一个缓冲区。。。我想在jimp完成图像缩放后。。这个新的缓冲区会起作用。。但事实并非如此。。有什么想法吗

完整代码：

exports.resize = async (req, res, next) => {
  // check if there is no new file to resize
  if (!req.file) {
    next(); // skip to the next middlewaree
    return;
  }
  const extension = req.file.mimetype.split('/')[1]
  req.body.photo = `${uuid.v4()}.${extension}`
  // now we resize
  const photo = await jimp.read(req.file.buffer)

  await photo.cover(300, 300);

  AWS.config.update({
    secretAccessKey: process.env.SECRETACCESSKEY,
    accessKeyId: process.env.ACCESSKEYID,
    region: 'us-east-1'
  })

  const s3 = new AWS.S3()

  const params = {
    Bucket: 'jamsession-images',
    Key: req.body.photo,
    // this line seems to be the issue.. 
    // even though photo.bitmap.data its also a buffer
    Body: photo.bitmap.data
  };


  s3.upload(params, function (err, data) {
    if (err) {
      console.log('%%%%%%%%%%%%%%% error in callback');
      console.log(err);
    }
    console.log('****************** success');
    console.log(data);
  });


  // await photo.write(`./public/uploads/${req.body.photo}`);
  // once we have written the photo to our filesystem, keep going!
  next()
};

---

我也有这个问题，为了得到结果图像的正确缓冲区，我们必须使用Jimp的getBuffer函数

image.getBuffer(mime, cb);

支持的MIME类型

Jimp.MIME_PNG; // "image/png"
Jimp.MIME_JPEG; // "image/jpeg"
Jimp.MIME_BMP; // "image/bmp"

但是使用Jimp.AUTO可以拥有原始图像的mime类型并使用它

您可以在中阅读更多getBuffer函数

photo.getBuffer(Jimp.AUTO, function(error, result){
    const params = {
        Bucket: 'jamsession-images',
        Key: req.body.photo,
        // correct buffer 
        Body: result
    };

    s3.upload(...);
});