Dart

S3 - Working with Buckets in a Region

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Demonstrates how to work with S3 buckets located in a particular region. 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.

  // When usig the REST class to access an S3 bucket that has been created in a particular region,
  // there are three important things to remember:
  // 
  // 1) Connect to the domain that includes the region.  For example, instead of connecting to
  //    "s3.amazonaws.com", connect to "s3.eu-central-1.amazonaws.com" if your bucket is in the EU Frankfurt region.
  //    See http://docs.aws.amazon.com/general/latest/gr/rande.html#s3_region   for a list of S3 region domains (endpoints)
  // 
  // 2) Set the AuthAws.Region property equal to the region, such as "eu-central-1".
  // 
  // 3) Include the region in request's Host header.
  // 

  // This example will upload to a bucket in the eu-central-1 region.
  // 
  final rest = CkRest();

  // Connect to the Amazon AWS REST server.
  final bTls = true;
  final port = 443;
  final bAutoReconnect = true;
  rest.connect('s3.eu-central-1.amazonaws.com', port, bTls, bAutoReconnect);

  // Provide AWS credentials for the REST call.
  final authAws = CkAuthAws();
  authAws.accessKey = 'AWS_ACCESS_KEY';
  authAws.secretKey = 'AWS_SECRET_KEY';
  authAws.serviceName = 's3';
  authAws.region = 'eu-central-1';
  rest.setAuthAws(authAws);

  // Set the bucket name via the HOST header.
  // In this case, the bucket name is "chilkateufrankfurt" (which was created in the eu-central-1 region)
  rest.host = 'chilkateufrankfurt.s3.eu-central-1.amazonaws.com';

  final fileData = CkBinData();
  fileData.loadFile('qa_data/jpg/starfish.jpg');

  // Upload the file to Amazon S3.
  final responseBody = CkStringBuilder();
  try {
    rest.fullRequestBd('PUT', '/starfish.jpg', fileData, responseBody);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // Did we get a 200 response indicating success?
  final statusCode = rest.responseStatusCode;
  if (statusCode != 200) {
    print('Error response: ${responseBody.getAsString()}');
    print('Status code: $statusCode, Status text: ${rest.responseStatusText}');
    return;
  }

  print('File successfully uploaded.');
}