Dart

S3 Add Tags to an Object

See more Amazon S3 (new) Examples

Demonstrates how to add one or more tags to an S3 object. 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 Amazon AWS REST server in the desired region.
  // (for us-east-1, we use "s3.amazonaws.com", but for another region, such as us-west-2, we would use "s3-us-west-2.amazonaws.com")
  final bTls = true;
  final port = 443;
  final bAutoReconnect = true;
  rest.connect('s3.amazonaws.com', port, bTls, bAutoReconnect);

  // Provide AWS credentials.
  final authAws = CkAuthAws();
  authAws.accessKey = 'AWS_ACCESS_KEY';
  authAws.secretKey = 'AWS_SECRET_KEY';
  authAws.serviceName = 's3';
  authAws.region = 'us-east-1';

  rest.setAuthAws(authAws);

  // Set the bucket name via the HOST header.
  // In this case, the bucket name is "chilkat100".
  // Note that the Host header should use "bucketName.s3.amazonaws.com", not "bucketName.s3-us-east-1.amazonaws.com"
  // The same applies to aother regions.  The Host header should simply be <bucketName>.s3.amazonaws.com regardless of the region.
  rest.host = 'chilkat100.s3.amazonaws.com';

  final xml = CkXml();
  xml.tag = 'Tagging';
  xml.updateChildContent('TagSet|Tag|Key', 'plant');
  xml.updateChildContent('TagSet|Tag|Value', 'chili pepper');

  final sbRequestBody = CkStringBuilder();
  xml.getXmlSb(sbRequestBody);

  // It is important to add the terminating "=" after the "?tagging".
  final sbResponse = CkStringBuilder();
  try {
    rest.fullRequestSb('PUT', '/chiliPepper.gif?tagging=', sbRequestBody, sbResponse);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  print('Response status code: ${rest.responseStatusCode}');

  // When successful, the S3 Storage service will respond with a 200 response code,
  // with an XML body.  
  if (rest.responseStatusCode != 200) {
    // 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: ${sbResponse.getAsString()}');
    print('---');
    print('LastRequestStartLine: ${rest.lastRequestStartLine}');
    print('LastRequestHeader: ${rest.lastRequestHeader}');
  }

  print(sbResponse.getAsString());
  print('Success.');
}