i'm trying to upload a file through Postman to my bucket. Im usign a post request so on my nodejs backend i'm generating a presigned post url, by using this function on aws sdk

Url() {
    const suffix = `${(0, uuid_1.v4)()}`;
    const extension = path_1.default.basename(this.fileName);
    const params = {
        Bucket: constants_1.BUCKET,
        Fields: {
            Key: `${this.pathToSave}/${suffix}${extension}`,
            "Content-Type": "image/jpeg"
        },
        Conditions: [
            ["content-length-range", 0.1, 200000000],
            ["eq", "$x-amz-meta-postid", this.postId],
            ["eq", "$Content-Type", "image/jpeg"]
        ],
        Expires: 180
    };
    return new Promise((resolve, reject) => {
        S3.createPresignedPost(params, function (err, data) {
            if (err) {
                reject(err);
                return;
            }
            resolve(data);
        });
    });
}

This is how i'm making the request through postman

The problem is that when i send the request i'm gettin a 400 Bad Request error. I have read all the aws documentation and searched online, but i'm not understanding how to solve this problem.

CodePudding user response：

In your conditions change:

["content-length-range", 0.1, 200000000] to ["content-length-range", 1, 200000000]

My code that works:

const params = {
    Bucket: "{bucket_name}",
    Fields: {
        Key: `test.jpg`,
        "Content-Type": "image/jpeg"
    },
     Conditions: [
        ["content-length-range", 1, 2000000000],
        ["eq", "$x-amz-meta-postid", "some-post-id"],
        ["eq", "$Content-Type", "image/jpeg"]
   ],
    Expires: 380
};

s3.createPresignedPost(params, function(err, data) {
  if (err) {
    console.error('Presigning post data encountered an error', err);
  } else {
    console.log('The post data is', data);
  }
});

Request to postman: