上传的AWS S3映像已损坏

时间:2019-05-20 23:12:26

标签: node.js image-processing amazon-s3

在上传图像时,如果我使用req.file.buffer中的数据多数民众赞成在{.1}}这是一个数字数组..缓冲区。它将图像正确上传到AWS s3。

但是我需要在...之前调整图像大小,所以我试图使用jimp,就像这样:

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

await photo.cover(300, 300);

然后将其传递给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,如果我这样做了..它会将图像上传到aws s3 ..但图像已损坏

我在这里做什么?我认为aws s3需要在budy缓冲区中...而且我认为在jimp完成缩放图像之后..该新缓冲区可以工作..但是没有任何想法吗?

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()
};

1 个答案:

答案 0 :(得分:1)

我也有这个问题,为了获得正确的结果图像缓冲区,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哑剧类型并使用它。

您可以在https://www.npmjs.com/package/jimp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(...);
});