(PowerShell) 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.

Chilkat .NET Downloads Chilkat .NET Assemblies

Add-Type -Path "C:\chilkat\ChilkatDotNet47-9.5.0-x64\ChilkatDotNet47.dll"

# 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.

$rest = New-Object Chilkat.Rest

# Connect to the Azure Storage Blob Service
$bTls = $true
$port = 443
$bAutoReconnect = $true
# In this example, the storage account name is "chilkat".
$success = $rest.Connect("chilkat.blob.core.windows.net",$port,$bTls,$bAutoReconnect)
if ($success -ne $true) {
    $($rest.LastErrorText)
    exit
}

# Provide Azure Cloud credentials for the REST call.
$azAuth = New-Object 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..
$xml = New-Object 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
$fac = New-Object 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...)
$blockSize = 16384

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

$crypt = New-Object Chilkat.Crypt2
$crypt.HashAlgorithm = "md5"

$sbResponseBody = New-Object Chilkat.StringBuilder
$uriPath = New-Object Chilkat.StringBuilder

$dataBlock = New-Object Chilkat.BinData

$i = 0
while ($i -lt $numBlocks) {

    $dataBlock.Clear()
    $success = $fac.ReadBlockBd($i,$blockSize,$dataBlock)
    if ($success -eq $false) {
        $($fac.LastErrorText)
        exit
    }

    # 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 -eq $false) {
        $($rest.LastErrorText)
        exit
    }

    # Verify that we received a 201 status code.
    if ($rest.ResponseStatusCode -ne 201) {
        # Examine the request/response to see what happened.
        $("response status code = " + $rest.ResponseStatusCode)
        $("response status text = " + $rest.ResponseStatusText)
        $("response header: " + $rest.ResponseHeader)
        $("response body (if any): " + $sbResponseBody.GetAsString())
        $("---")
        $("LastRequestStartLine: " + $rest.LastRequestStartLine)
        $("LastRequestHeader: " + $rest.LastRequestHeader)
        exit
    }

    $i = $i + 1
}

$fac.FileClose()

# Now commit the blocks.
# Let's have a look at the XML that will commit the blocks:
$xmlStr = $xml.GetXml()
$($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...
$responseStr = $rest.FullRequestString("PUT","/mycontainer/hamlet.xml?comp=blocklist",$xmlStr)
if ($rest.LastMethodSuccess -ne $true) {
    $($rest.LastErrorText)
    exit
}

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

if ($rest.ResponseStatusCode -ne 201) {
    # Examine the request/response to see what happened.
    $("response status code = " + $rest.ResponseStatusCode)
    $("response status text = " + $rest.ResponseStatusText)
    $("response header: " + $rest.ResponseHeader)
    $("response body (if any): " + $responseStr)
    $("---")
    $("LastRequestStartLine: " + $rest.LastRequestStartLine)
    $("LastRequestHeader: " + $rest.LastRequestHeader)
    exit
}

$("Success.")