Dart

Azure Storage Blob Simple Upload

See more Azure Cloud Storage Examples

Demonstrates the simplest possible upload to Azure Storage. The contents of a string variable are uploaded to a blob file in Azure Cloud Storage. Dart

import 'package:chilkat/chilkat.dart';

void main() {
  // 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;
  }

  // Provide Azure Cloud credentials for the REST call.
  final azAuth = CkAuthAzureStorage();
  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';
  rest.setAuthAzureStorage(azAuth);

  // Set some request headers.
  rest.addHeader('x-ms-blob-content-disposition', 'attachment; filename="helloWorld.txt"');
  rest.addHeader('x-ms-blob-type', 'BlockBlob');
  rest.addHeader('x-ms-meta-m1', 'v1');
  rest.addHeader('x-ms-meta-m2', 'v2');

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

  // Upload the string "Hello World!" to the file named "helloWorld.txt" located in the container named "test".
  final String responseStr;
  try {
    responseStr = rest.fullRequestString('PUT', '/test/helloWorld.txt', 'Hello World!');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // When successful, the Azure Storage service will respond with a 201 response code,
  // with an empty body.  Therefore, in the success condition, the responseStr is empty.
  if (rest.responseStatusCode == 201) {
    print('File uploaded.');
  } else {
    // 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): $responseStr');
    print('---');
    print('LastRequestStartLine: ${rest.lastRequestStartLine}');
    print('LastRequestHeader: ${rest.lastRequestHeader}');
  }
}