(C#) Upload File in Blocks (with Content-MD5 header) and Commit the Block List

Demonstrates how to upload a file in blocks and then commit the block list. This example includes a Content-MD5 header for each block.

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// Azure Blob Service Example: Upload a file in blocks, and then commit the block list.
// See also: https://msdn.microsoft.com/en-us/library/azure/dd135726.aspx

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

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

// Connect to the Azure Storage Blob Service
bool bTls = true;
int port = 443;
bool bAutoReconnect = true;
// In this example, the storage account name is "chilkat".
bool success = rest.Connect("chilkat.blob.core.windows.net",port,bTls,bAutoReconnect);
if (success != true) {
    Debug.WriteLine(rest.LastErrorText);
    return;
}

// Provide Azure Cloud credentials for the REST call.
Chilkat.AuthAzureStorage azAuth = new Chilkat.AuthAzureStorage();
azAuth.AccessKey = "AZURE_ACCESS_KEY";
// The account name used here should match the 1st part of the domain passed in the call to Connect (above).
azAuth.Account = "chilkat";
azAuth.Scheme = "SharedKey";
azAuth.Service = "Blob";
// This causes the "x-ms-version: 2021-08-06" header to be automatically added.
azAuth.XMsVersion = "2021-08-06";
success = rest.SetAuthAzureStorage(azAuth);

// Note: The application does not need to explicitly set the following
// headers: Content-Length, x-ms-date, Authorization.  These headers
// are automatically set by Chilkat.

// As the blocks are uploaded, we'll keep an XML block list for the subsequent commit..
Chilkat.Xml xml = new Chilkat.Xml();
xml.Tag = "BlockList";

// Any type of file can be uploaded in this way.  It can a text file, binary file, anything...
// This example will upload an XML file that is approximately 275K in size.  It can be downloaded
// at http://www.chilkatsoft.com/hamlet.xml
Chilkat.FileAccess fac = new Chilkat.FileAccess();
success = fac.OpenForRead("qa_data/xml/hamlet.xml");
// Assuming success for the example..

// We'll upload in 16K blocks (normally a program would upload in larger block sizes than this,
// but this is just an example...)
int blockSize = 16384;

// How many 16K blocks?  (Including 1 for the last partial block)
int numBlocks = fac.GetNumBlocks(blockSize);

Chilkat.Crypt2 crypt = new Chilkat.Crypt2();
crypt.HashAlgorithm = "md5";

Chilkat.StringBuilder sbResponseBody = new Chilkat.StringBuilder();
Chilkat.StringBuilder uriPath = new Chilkat.StringBuilder();
string blockId;
Chilkat.BinData dataBlock = new Chilkat.BinData();
string contentMd5;
int i = 0;
while (i < numBlocks) {

    dataBlock.Clear();
    success = fac.ReadBlockBd(i,blockSize,dataBlock);
    if (success == false) {
        Debug.WriteLine(fac.LastErrorText);
        return;
    }

    // Generate a base64 block ID.  
    // (Chilkat provides a helper method named GenBlockId to make this easy)
    // A pre-base64 encoded block ID length of 4 is sufficient in this case because
    // this file certainly won't have more than 99,999 blocks..
    blockId = fac.GenBlockId(i,4,"base64");

    // Add this blockId to the list of blocks to be committed.
    xml.NewChild2("Latest",blockId);

    // Build the URI path
    uriPath.Clear();
    success = uriPath.Append("/mycontainer/hamlet.xml?comp=block&blockId=");
    success = uriPath.Append(blockId);

    contentMd5 = crypt.HashBdENC(dataBlock);
    rest.AddHeader("Content-MD5",contentMd5);

    // Upload this block..
    sbResponseBody.Clear();
    success = rest.FullRequestBd("PUT",uriPath.GetAsString(),dataBlock,sbResponseBody);
    if (success == false) {
        Debug.WriteLine(rest.LastErrorText);
        return;
    }

    // Verify that we received a 201 status code.
    if (rest.ResponseStatusCode != 201) {
        // 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 (if any): " + sbResponseBody.GetAsString());
        Debug.WriteLine("---");
        Debug.WriteLine("LastRequestStartLine: " + rest.LastRequestStartLine);
        Debug.WriteLine("LastRequestHeader: " + rest.LastRequestHeader);
        return;
    }

    i = i + 1;
}

fac.FileClose();

// Now commit the blocks.
// Let's have a look at the XML that will commit the blocks:
string xmlStr = xml.GetXml();
Debug.WriteLine(xmlStr);

// The XML will look like this:

// <?xml version="1.0" encoding="utf-8" ?>
// <BlockList>
//     <Latest>MDAwMA==</Latest>
//     <Latest>MDAwMQ==</Latest>
//     <Latest>MDAwMg==</Latest>
//     <Latest>MDAwMw==</Latest>
//     <Latest>MDAwNA==</Latest>
//     <Latest>MDAwNQ==</Latest>
//     <Latest>MDAwNg==</Latest>
//     <Latest>MDAwNw==</Latest>
//     <Latest>MDAwOA==</Latest>
//     <Latest>MDAwOQ==</Latest>
//     <Latest>MDAxMA==</Latest>
//     <Latest>MDAxMQ==</Latest>
//     <Latest>MDAxMg==</Latest>
//     <Latest>MDAxMw==</Latest>
//     <Latest>MDAxNA==</Latest>
//     <Latest>MDAxNQ==</Latest>
//     <Latest>MDAxNg==</Latest>
//     <Latest>MDAxNw==</Latest>
// </BlockList>

// --------------------------------------------------------------------------
// IMPORTANT: Remove the Content-MD5 header previously set in the loop above.
// --------------------------------------------------------------------------
rest.RemoveHeader("Content-MD5");

// Send the PUT Block List...
string responseStr = rest.FullRequestString("PUT","/mycontainer/hamlet.xml?comp=blocklist",xmlStr);
if (rest.LastMethodSuccess != true) {
    Debug.WriteLine(rest.LastErrorText);
    return;
}

// When successful, the Azure Storage service will respond with a 201 response status code,
// with no response body.

if (rest.ResponseStatusCode != 201) {
    // 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 (if any): " + responseStr);
    Debug.WriteLine("---");
    Debug.WriteLine("LastRequestStartLine: " + rest.LastRequestStartLine);
    Debug.WriteLine("LastRequestHeader: " + rest.LastRequestHeader);
    return;
}

Debug.WriteLine("Success.");