(PHP ActiveX) Azure File Service: Upload Large File

Sample code to upload a large file to a directory in a share in the Azure File Service. A file is uploaded by first creating the file in the Azure share and then writing ranges of bytes to the file. Azure imposes a 4MB limit for each PUT to write a range. Files larger than 4MB need to be uploaded by making multiple "Put Range" calls. This example uploads a large file requiring multiple "Put Range" calls.

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows Note: The php_com_dotnet.dll may need to be enabled inside of php.ini.

<?php

// Azure File Service Example: Upload a large file.  
// See:  https://docs.microsoft.com/en-us/rest/api/storageservices/create-share
// also see: https://docs.microsoft.com/en-us/rest/api/storageservices/put-range

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

// For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.Rest')
$rest = new COM("Chilkat.Rest");

// Connect to the Azure Storage Blob Service
$bTls = 1;
$port = 443;
$bAutoReconnect = 1;
// In this example, the storage account name is "chilkat".
$success = $rest->Connect('chilkat.file.core.windows.net',$port,$bTls,$bAutoReconnect);
if ($success != 1) {
    print $rest->LastErrorText . "\n";
    exit;
}

// This example will upload a larger file.
$localFilePath = 'qa_data/zips/somethingBig.zip';
// For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.FileAccess')
$fac = new COM("Chilkat.FileAccess");
// Note: The FileSize method returns a signed 32-bit integer.  If the file is potentially larger than 2GB, call FileSizeStr instead to return
// the size of the file as a string, then convert to an integer value.
$szLocalFile = $fac->FileSize($localFilePath);
if ($szLocalFile < 0) {
    print $fac->LastErrorText . "\n";
    exit;
}

// Provide Azure Cloud credentials for the REST calls.
// For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.AuthAzureStorage')
$azAuth = new COM("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 = 'File';
// 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: x-ms-date, Authorization.  These headers
// are automatically set by Chilkat.

// However, a few additional headers are required for the "Create File" operation:
$rest->AddHeader('x-ms-type','file');

// This required header specifies the final size of the file (or the maximum size it can be).
// For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.StringBuilder')
$sbFileSize = new COM("Chilkat.StringBuilder");
$sbFileSize->AppendInt($szLocalFile);
$rest->AddHeader('x-ms-content-length',$sbFileSize->getAsString());

// Send a PUT request to create the file (or replace the file if it already exists).
// This will initialize the file in the Azure file storage.  To upload content, we'll need
// to do the "Put Range" operation one or more times.

// The following will create the file "somethingBig.zip" in the share "pip"
$responseStr = $rest->fullRequestNoBody('PUT','/pip/somethingBig.zip');
if ($rest->LastMethodSuccess != 1) {
    print $rest->LastErrorText . "\n";
    exit;
}

// When successful, the Azure File Service will respond with a 201 (Created) response status code,
// with no XML response body.  If an error response is returned, there will be an XML response body.

if ($rest->ResponseStatusCode != 201) {
    // Examine the request/response to see what happened.
    print 'response status code = ' . $rest->ResponseStatusCode . "\n";
    print 'response status text = ' . $rest->ResponseStatusText . "\n";
    print 'response header: ' . $rest->ResponseHeader . "\n";
    print 'response body (if any): ' . $responseStr . "\n";
    print '---' . "\n";
    print 'LastRequestStartLine: ' . $rest->LastRequestStartLine . "\n";
    print 'LastRequestHeader: ' . $rest->LastRequestHeader . "\n";
    exit;
}

print 'Successfully created somethingBig.zip' . "\n";

// --------------------------------------------------------------------------------
// Upload the file data...

// Make sure the headers from the "Create File" operation are removed.
$rest->ClearAllHeaders();

// The x-ms-write header is required for each "Put Range" request.
$rest->AddHeader('x-ms-write','update');

// For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.StringBuilder')
$sbRange = new COM("Chilkat.StringBuilder");
// For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.StringBuilder')
$sbResponseBody = new COM("Chilkat.StringBuilder");
// For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.BinData')
$bdFileData = new COM("Chilkat.BinData");

// Open the file.  We'll be reading and uploading in chunks..
$success = $fac->OpenForRead($localFilePath);
if ($success != 1) {
    print $fac->LastErrorText . "\n";
    exit;
}

$numBytesLeft = $szLocalFile;
$curIndex = 0;
while ($numBytesLeft > 0) {

    $chunkSize = $numBytesLeft;
    // Azure allows for 4MB max chunks  (4 x 1024 x 1024 = 4194304)
    if ($chunkSize > 4194304) {
        $chunkSize = 4194304;
    }

    // The only tricky part here is to correctly add the x-ms-range header.
    // It will be formatted like this:
    // x-ms-range: bytes=0-759623
    $sbRange->Clear();
    $sbRange->Append('bytes=');
    $sbRange->AppendInt($curIndex);
    $sbRange->Append('-');
    $sbRange->AppendInt($curIndex + $chunkSize - 1);

    // This replaces the header if it already exists..
    $rest->AddHeader('x-ms-range',$sbRange->getAsString());

    // Read the next chunk from the local file.
    $bdFileData->Clear();
    $success = $fac->FileReadBd($chunkSize,$bdFileData);

    $success = $rest->FullRequestBd('PUT','/pip/somethingBig.zip?comp=range',$bdFileData,$sbResponseBody);
    if ($success != 1) {
        // This would indicate a failure where no response was received.
        print $rest->LastErrorText . "\n";
        exit;
    }

    // A 201 response indicates the chunk was uploaded.
    if ($rest->ResponseStatusCode != 201) {
        // Examine the request/response to see what happened.
        print 'response status code = ' . $rest->ResponseStatusCode . "\n";
        print 'response status text = ' . $rest->ResponseStatusText . "\n";
        print 'response header: ' . $rest->ResponseHeader . "\n";
        print 'response body (if any): ' . $responseStr . "\n";
        print '---' . "\n";
        print 'LastRequestStartLine: ' . $rest->LastRequestStartLine . "\n";
        print 'LastRequestHeader: ' . $rest->LastRequestHeader . "\n";
        exit;
    }

    print 'Uploaded chunk from ' . $curIndex . ' to ' . ($curIndex + $chunkSize - 1) . "\n";

    $curIndex = $curIndex + $chunkSize;
    $numBytesLeft = $numBytesLeft - $chunkSize;
}

$fac->FileClose();

print 'success.' . "\n";

?>