Question

我正在尝试在我的sails js app上使用AWS SDK。我不断收到此错误：无法确定[object Object]的长度。有谁知道造成这种情况的原因？

以下是代码：

var AWS = require（'aws-sdk'）;

              var s3bucket = new AWS.S3({
                accessKeyId : 'xxx',
                secretAccessKey : 'xxx',
                params: {Bucket: 'sweetestspots'}
              });
              var body = req.file('cover');

              s3bucket.upload({Key: 'filename', ACL:'public-read', Body:body}, function(err, data) {
                console.log ("data")
                console.log (data)
                if (err) {
                  console.log("Error uploading data: ", err);
                  return res.send("err");

                } else {
                  console.log("Successfully uploaded data to myBucket/myKey");
                  console.log(data);

                  return res.send("uploaded");
                }
              });

Answer 1

根据aws

Body的值应为缓冲区，blob或流

upload(params = {}, [options], [callback])

如果有效负载足够大，则使用智能并发处理部件来上传任意大小的缓冲区，blob或流。您可以通过设置选项来配置并发队列大小。

var params = {Bucket: 'bucket', Key: 'key', Body: stream};
s3.upload(params, function(err, data) {
    console.log(err, data);
});

您需要像fs.createReadStream(req.file.path)那样流式传输文件并将其发送到Body参数

Answer 2

我也遇到这种错误。问题是您需要将Body作为Buffer传递。我是这样做的，问题就没了：

router.post("/upload-image", (req, res) => {
  let imageFileName;
  const busboy = new BusBoy({ headers: req.headers });

  busboy.on("file", (fieldName, file, fileName, encoding, mimetype) => {
    if (mimetype !== "image/jpeg" && mimetype !== "image/png") {
      return res.status(400).json({ error: "Bad format in the image" });
    }

    const filePath = path.join(os.tmpdir(), fileName);

    const params = {
      Bucket: "your bucket name",
      Key: fileName,
      Body: "",
      ACL: "public-read",
      ContentType: mimetype,
    };


    file.on("data", function (data) {
      params.ContentLength = data.length;
      params.Body = data;
    });

    // needed to call upload function after a while, because params was not updating immediately 
    setTimeout(() => {
      s3.upload(params, (error, data) => {
        if (error) {
          return res.status(500).send(error);
        }
        return res.status(200).json({ imageURL: data.Location });
      });
    }, 1000);

    file.pipe(fs.createWriteStream(filePath));
  });

  busboy.end(req.rawBody);
});

并且此代码还将解决将图片上传到s3后获得零字节的问题

Answer 3

我在使用 putObject 上传流时遇到此错误。解决方案是切换到上传或使用缓冲区/blob 而不是流。

Answer 4

嗨，我遇到了同样的问题，我发给你的是我的代码。

            var s3bucket = new AWS.S3({
                accessKeyId: 'xxx',
                secretAccessKey: 'xxx+xxx',

            });


            var body = new Buffer(req.file('cover'), 'base64');

            var params = {
                Bucket: 'sweetestspots',
                Key: 'yourimagename',
                Body: body,
                ContentEncoding: 'base64',
                ContentType: 'image/png',
                ACL: 'public-read'
            };

            s3bucket.upload(params, function(err, data) {
                if (err) {
                    console.log("Error uploading data: ", err);
                } else {
                    console.log("Successfully uploaded data to myBucket" + JSON.stringify(data));

                }
            });

请尝试此代码。

使用AWS SDK上传节点JS文件错误：无法确定[object Object]的长度

4 个答案: