(Node.js) S3 Complete a Multipart Upload

This operation completes a multipart upload by assembling previously uploaded parts.

Processing of a Complete Multipart Upload request could take several minutes to complete. After Amazon S3 begins processing the request, it sends an HTTP response header that specifies a 200 OK response. While processing is in progress, Amazon S3 periodically sends whitespace characters to keep the connection from timing out. Because a request could fail after the initial 200 OK response has been sent, it is important that you check the response body to determine whether the request succeeded.

This example sends a POST request to complete a multipart upload, which looks like this:

POST /ObjectName?uploadId=UploadId HTTP/1.1
Host: BucketName.s3.amazonaws.com
Date: Date
Content-Length: Size
Authorization: authorization string

<CompleteMultipartUpload>
  <Part>
    <PartNumber>PartNumber</PartNumber>
    <ETag>ETag</ETag>
  </Part>
  ...
</CompleteMultipartUpload>

Install Chilkat for Node.js and Electron using npm at Chilkat npm packages for Node.js Chilkat npm packages for Electron on Windows, Linux, MacOSX, and ARM

var os = require('os');
if (os.platform() == 'win32') {  
    if (os.arch() == 'ia32') {
        var chilkat = require('@chilkat/ck-node21-win-ia32');
    } else {
        var chilkat = require('@chilkat/ck-node21-win64'); 
    }
} else if (os.platform() == 'linux') {
    if (os.arch() == 'arm') {
        var chilkat = require('@chilkat/ck-node21-arm');
    } else if (os.arch() == 'x86') {
        var chilkat = require('@chilkat/ck-node21-linux32');
    } else {
        var chilkat = require('@chilkat/ck-node21-linux64');
    }
} else if (os.platform() == 'darwin') {
    if (os.arch() == 'arm64') {
        var chilkat = require('@chilkat/ck-node21-mac-m1');
    } else {
        var chilkat = require('@chilkat/ck-node21-macosx');
    }
}

function chilkatExample() {

    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    // The 1st step in an S3 multipart upload is to initiate it,
    // as shown here: Initiate S3 Multipart Upload

    // The 2nd step is to upload the parts
    // as shown here: S3 Upload Parts

    // The 3rd and final step (this example) is to complete the multipart upload.

    // Other S3 Multipart Upload Examples:
    // Abort Multipart Upload
    // List Parts

    // When the multipart upload was initiated, an UploadId was provided in the XML response, and it 
    // was saved to a file.  Steps 2 and 3 begin by loading the XML and getting
    // the Upload ID.

    var xmlInit = new chilkat.Xml();
    var success = xmlInit.LoadXmlFile("s3_multipart_uploads/initiate.xml");
    if (success !== true) {
        console.log("Did not find the initiate.xml XML file.");
        return;
    }

    var uploadId = xmlInit.GetChildContent("UploadId");
    console.log("UploadId = " + uploadId);

    // We'll also need the XML file that contains a record of the parts
    // with part numbers and ETags.  (This file was produced when parts were being uploaded.)
    var xmlPartsList = new chilkat.Xml();
    success = xmlPartsList.LoadXmlFile("s3_multipart_uploads/partsList.xml");
    if (success !== true) {
        console.log("Did not find the partsList.xml XML file.");
        return;
    }

    var rest = new chilkat.Rest();

    // Connect to the Amazon AWS REST server.
    var bTls = true;
    var port = 443;
    var bAutoReconnect = true;
    success = rest.Connect("s3.amazonaws.com",port,bTls,bAutoReconnect);

    // ----------------------------------------------------------------------------
    // Important: For buckets created in regions outside us-east-1,
    // there are three important changes that need to be made.
    // See Working with S3 Buckets in Non-us-east-1 Regions for the details.
    // ----------------------------------------------------------------------------

    // Provide AWS credentials for the REST call.
    var authAws = new chilkat.AuthAws();
    authAws.AccessKey = "AWS_ACCESS_KEY";
    authAws.SecretKey = "AWS_SECRET_KEY";
    authAws.ServiceName = "s3";

    success = rest.SetAuthAws(authAws);

    // Set the bucket name via the HOST header.
    // In this case, the bucket name is "chilkat100".
    rest.Host = "chilkat100.s3.amazonaws.com";

    // The "uploadId=UploadId" must be added as a query parameter.  This allows it to be 
    // incorporated into the AWS signature calculation, which is a requirement.
    // Therefore, we use AddQueryParam:
    rest.AddQueryParam("uploadId",uploadId);

    // Our ObjectName in this case is "somethingBig.zip".
    var responseXml = rest.FullRequestString("POST","/somethingBig.zip",xmlPartsList.GetXml());
    if (rest.LastMethodSuccess !== true) {
        console.log(rest.LastErrorText);
        return;
    }

    // When successful, the S3 Storage service will respond with a 200 response code,
    // with an XML body.  
    if (rest.ResponseStatusCode !== 200) {
        // Examine the request/response to see what happened.
        console.log("response status code = " + rest.ResponseStatusCode);
        console.log("response status text = " + rest.ResponseStatusText);
        console.log("response header: " + rest.ResponseHeader);
        console.log("response body: " + responseXml);
        console.log("---");
        console.log("LastRequestStartLine: " + rest.LastRequestStartLine);
        console.log("LastRequestHeader: " + rest.LastRequestHeader);
    }

    // Load the XML response into Chilkat XMl and emit via GetXml to see the XML in a pretty-printed (indented) readable format.
    var xml = new chilkat.Xml();
    xml.LoadXml(responseXml);
    console.log(xml.GetXml());
    console.log("----");

    console.log("Multipart upload completed.");

}

chilkatExample();