Dart

Upload using Azure Storage Account Shared Access Signature (SAS) Authorization

See more Azure Cloud Storage Examples

Sample code to upload binary bytes to a block blob in Azure Cloud Storage using an Azure Storage Account Shared Access Signature (SAS) Authorization. This creates a block blob, or replaces an existing block blob.

Note: The maximum size of a block blob created by uploading in a single step is 64MB. For larger files, the upload must be broken up into blocks. There is another Chilkat example for that..

Note: This example requires Chilkat v9.5.0.65 or later.

Dart

import 'package:chilkat/chilkat.dart';

void main() {
  // Note: This example requires Chilkat v9.5.0.65 or greater.

  // Azure Blob Service Example: Upload binary bytes to a block blob.
  // This uses a Shared Access Signature (SAS) for Authorization.
  // This creates a new block blob or replaces an existing one in its entirety.
  // See also: https://msdn.microsoft.com/en-us/library/azure/dd179451.aspx

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

  final rest = CkRest();

  // Connect to the Azure Storage Blob Service
  final bTls = true;
  final port = 443;
  final bAutoReconnect = true;
  // In this example, the storage account name is "chilkat".
  try {
    rest.connect('chilkat.blob.core.windows.net', port, bTls, bAutoReconnect);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // ----------------------------------------------------------------------------------------------
  // The code above this comment could be placed inside a function/subroutine within the application
  // because the connection does not need to be made for every request.  Once the connection is made
  // the app may send many requests..
  // ----------------------------------------------------------------------------------------------

  // 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.

  // Let's load a previously computed Azure Storage Account SAS token and use it.
  // See How to Create an Azure Storage Account Shared Access Signature
  final sbToken = CkStringBuilder();
  try {
    sbToken.loadFile('qa_data/tokens/azureStorageAccountSas.txt', 'utf-8');
  } on ChilkatException {
    print('Failed to load SAS token.');
    return;
  }

  // Add the Shared Access Signature query params for authorization.
  rest.addQueryParams(sbToken.getAsString());

  // IMPORTANT: Make sure to set the x-ms-blob-type header:
  rest.addHeader('x-ms-blob-type', 'BlockBlob');

  // IMPORTANT: Make sure to add the x-ms-date header.
  // When the header name is "x-ms-date", Chilkat will recognize the keyword "NOW" 
  // and will substitute the current system date/time formatted as required by Microsoft.
  rest.addHeader('x-ms-date', 'NOW');

  // For this example, we'll just load a JPG file into memory..
  final binData = CkBinData();
  try {
    binData.loadFile('qa_data/jpg/starfish.jpg');
  } on ChilkatException {
    print('Failed to load JPG file.');
    return;
  }

  // Note: The maximum size of a block blob created by uploading in a single step is 64MB.  
  // For larger files, the upload must be broken up into blocks.  There is another Chilkat example for that..
  final sbResponse = CkStringBuilder();
  try {
    rest.fullRequestBd('PUT', '/mycontainer/starfish.jpg', binData, sbResponse);
  } on ChilkatException catch (e) {
    print(e.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.
    print('response status code = ${rest.responseStatusCode}');
    print('response status text = ${rest.responseStatusText}');
    print('response header: ${rest.responseHeader}');
    print('response body (if any): ${sbResponse.getAsString()}');
    print('---');
    print('LastRequestStartLine: ${rest.lastRequestStartLine}');
    print('LastRequestHeader: ${rest.lastRequestHeader}');
    print('Failed.');
    return;
  }

  print('Success.');
}