(.NET Core C#) 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>

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// 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.

Chilkat.Xml xmlInit = new Chilkat.Xml();
bool success = xmlInit.LoadXmlFile("s3_multipart_uploads/initiate.xml");
if (success != true) {
    Debug.WriteLine("Did not find the initiate.xml XML file.");
    return;
}

string uploadId = xmlInit.GetChildContent("UploadId");
Debug.WriteLine("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.)
Chilkat.Xml xmlPartsList = new Chilkat.Xml();
success = xmlPartsList.LoadXmlFile("s3_multipart_uploads/partsList.xml");
if (success != true) {
    Debug.WriteLine("Did not find the partsList.xml XML file.");
    return;
}

Chilkat.Rest rest = new Chilkat.Rest();

// Connect to the Amazon AWS REST server.
bool bTls = true;
int port = 443;
bool 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.
Chilkat.AuthAws 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".
string responseXml = rest.FullRequestString("POST","/somethingBig.zip",xmlPartsList.GetXml());
if (rest.LastMethodSuccess != true) {
    Debug.WriteLine(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.
    Debug.WriteLine("response status code = " + Convert.ToString(rest.ResponseStatusCode));
    Debug.WriteLine("response status text = " + rest.ResponseStatusText);
    Debug.WriteLine("response header: " + rest.ResponseHeader);
    Debug.WriteLine("response body: " + responseXml);
    Debug.WriteLine("---");
    Debug.WriteLine("LastRequestStartLine: " + rest.LastRequestStartLine);
    Debug.WriteLine("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.
Chilkat.Xml xml = new Chilkat.Xml();
xml.LoadXml(responseXml);
Debug.WriteLine(xml.GetXml());
Debug.WriteLine("----");

Debug.WriteLine("Multipart upload completed.");