AWS Multipart Upload SignatureDoesNotMatch - node.js

Question

I am trying to upload a PDF file to AWS S3 using multi part uploads. However, when I send the PUT request for uploading the part, I receive a SignatureDoesNotMatch error.
<Error><Code>SignatureDoesNotMatch</Code><Message>The request signature we calculated does not match the signature you provided. Check your key and signing method.</Message>
My Server Code (Node) is as below:
CREATE MultiPart Upload
const AWS = require('aws-sdk');
AWS.config.region = 'us-east-1';
const s3 = new AWS.S3({ apiVersion: '2006-03-01' });
const s3Params = {
Bucket: 'bucket-name',
Key: 'upload-location/filename.pdf',
}
const createRequest = await s3.createMultipartUpload({
...s3Params
ContentType: 'application/pdf'
}).promise();
GET Signed URL
let getSignedUrlParams = {
Bucket: 'bucket-name',
Key: 'upload-location/filename.pdf',
PartNumber: 1,
UploadId: 'uploadId',
Expires: 10 * 60
}
const signedUrl = await s3.getSignedUrl('uploadPart',getSignedUrlParams);
And the Client code (in JS) is :
const response = await axios.put(signedUrl, chunkedFile, {headers: {'Content-Type':'application-pdf'}});
A few things to note:
This code works when I allow all public access to the bucket.However, if all public access is blocked, the code does not work.
With all public access blocked, I am still able to upload to the bucket with the same credentials using aws cli.
I already have tried re-generating AWS Access Key ID and Secret Access Key and that didnt help.
Not able to figure out what the problem is. Any help would be appreciated.
PS: This is the first question I have posted here. So please forgive me if I havent posted it appropriately. Let me know if more details are required.

Answer 1

Try something like this,it worked for me.
var fileName = 'your.pdf';
var filePath = './' + fileName;
var fileKey = fileName;
var buffer = fs.readFileSync('./' + filePath);
// S3 Upload options
var bucket = 'loctest';
// Upload
var startTime = new Date();
var partNum = 0;
var partSize = 1024 * 1024 * 5; // Minimum 5MB per chunk (except the last part) http://docs.aws.amazon.com/AmazonS3/latest/API/mpUploadComplete.html
var numPartsLeft = Math.ceil(buffer.length / partSize);
var maxUploadTries = 3;
var multiPartParams = {
Bucket: bucket,
Key: fileKey,
ContentType: 'application/pdf'
};
var multipartMap = {
Parts: []
};
function completeMultipartUpload(s3, doneParams) {
s3.completeMultipartUpload(doneParams, function(err, data) {
if (err) {
console.log("An error occurred while completing the multipart upload");
console.log(err);
} else {
var delta = (new Date() - startTime) / 1000;
console.log('Completed upload in', delta, 'seconds');
console.log('Final upload data:', data);
}
});
}
You will get error if the upload fails. We can help you to solve this if you print the results of
console.log(this.httpResponse)
and
console.log(this.request.httpRequest)

Answer 2

What worked for me was the version of the signature. While initializing S3, the signature version should also be mentioned.
const s3 = new AWS.S3({ apiVersion: '2006-03-01', signatureVersion: 'v4' });

Answer 3

Remove Content-Part header from the axios call.
const response = await axios.put(signedUrl, chunkedFile);
When adding only a part you're not actually uploading a complete file, so the content type is not application-pdf in your case.
This is different than doing a PUT for a complete object.