Dart

REST Upload String

See more Amazon S3 (new) Examples

Example to upload the contents of a string to the Amazon S3 service. 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.
  final bTls = true;
  final port = 443;
  final bAutoReconnect = true;
  rest.connect('s3.amazonaws.com', port, bTls, bAutoReconnect);

  // ----------------------------------------------------------------------------
  // Important: For buckets created in regions outside us-east-1,
  // there are three important changes that need to be made.
  // See Working with S3 Buckets in Non-us-east-1 Regions for the details.
  // ----------------------------------------------------------------------------

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

  // Set the bucket name via the HOST header.
  // In this case, the bucket name is "chilkat100".
  rest.host = 'chilkat100.s3.amazonaws.com';

  // Load a text file into memory.
  final fac = CkFileAccess();
  final String fileContents;
  try {
    fileContents = fac.readEntireTextFile('qa_data/xml/hamlet.xml', 'utf-8');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // To send the file in gzip or deflate compressed format, set the Content-Encoding request
  // header to "gzip" or "deflate".  (this is optional)
  rest.addHeader('Content-Encoding', 'gzip');

  // Indicate the Content-Type of our upload.  (This is optional)
  rest.addHeader('Content-Type', 'text/xml');

  // We can add an "Expect: 100-continue" header so that if the request is rejected
  // by the server immediately after receiving the request header, it can respond
  // and the client (Chilkat) can avoid sending the file data.
  // (this is optional)
  rest.addHeader('Expect', '100-continue');

  // Upload the file to Amazon S3.
  final String responseBodyStr;
  try {
    responseBodyStr = rest.fullRequestString('PUT', '/hamlet_play.xml', fileContents);
  } 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: $responseBodyStr');
    print('Status code: $statusCode, Status text: ${rest.responseStatusText}');
    return;
  }

  print('File successfully uploaded.');
}