Dart

Amazon Glacier Upload Archive from In-Memory Data

See more Amazon Glacier Examples

Demonstrates how to add an archive to a vault from data in memory.

Note: This example requires Chilkat v9.5.0.78 or greater.

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.
  final bTls = true;
  final port = 443;
  final bAutoReconnect = true;
  rest.connect('glacier.us-west-2.amazonaws.com', port, bTls, bAutoReconnect);

  // Provide AWS credentials.
  final authAws = CkAuthAws();
  authAws.accessKey = 'AWS_ACCESS_KEY';
  authAws.secretKey = 'AWS_SECRET_KEY';
  authAws.serviceName = 'glacier';
  authAws.region = 'us-west-2';

  rest.setAuthAws(authAws);

  // --------------------------------------------------------------------------
  // Note: The above REST connection and setup of the AWS credentials
  // can be done once.  After connecting, any number of REST calls can be made.
  // The "auto reconnect" property passed to rest.Connect indicates that if
  // the connection is lost, a REST method call will automatically reconnect
  // if needed.
  // --------------------------------------------------------------------------

  // Load the data to be uploaded.
  final bd = CkBinData();
  bd.loadFile('qa_data/jpg/penguins.jpg');
  // (The point here is that the contents of the bd don't necessarily have to come from a file.)

  // For more information, see Glacier Upload Archive Reference Documentation
  // 
  rest.addHeader('x-amz-glacier-version', '2012-06-01');

  // We'll need to pre-compute the SHA256 tree hash and the SHA256 linear hash.
  // The hashes are added in the following request headers:

  // x-amz-sha256-tree-hash: SHA256 tree hash
  // x-amz-content-sha256: SHA256 linear hash

  final crypt = CkCrypt2();
  crypt.hashAlgorithm = 'sha256-tree-hash';
  crypt.encodingMode = 'hexlower';
  final treeHashHex = crypt.hashBdENC(bd);
  rest.addHeader('x-amz-sha256-tree-hash', treeHashHex);

  crypt.hashAlgorithm = 'sha256';
  final linearHashHex = crypt.hashBdENC(bd);
  authAws.precomputedSha256 = linearHashHex;

  // We can optionally add a description
  rest.addHeader('x-amz-archive-description', 'Penguins JPG');

  final sbResponseBody = CkStringBuilder();
  try {
    rest.fullRequestBd('POST', '/AWS_ACCOUNT_ID/vaults/chilkat/archives', bd, sbResponseBody);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  final respStatusCode = rest.responseStatusCode;
  if (respStatusCode >= 400) {
    print('Response Status Code = $respStatusCode');
    print('Response Header:');
    print(rest.responseHeader);
    print('Response Body:');
    print(sbResponseBody.getAsString());
    return;
  }

  // Success is indicated by a 201 response status with an empty response body.
  print('response status code = $respStatusCode');

  // If successful, the response header looks like this.
  // The Location and x-amz-archive-id are two items of information we may wish to save..

  // HTTP/1.1 201 Created
  // x-amzn-RequestId: AAABZpJrTyioDC_HsOmHae8EZp_uBSJr6cnGOLKp_XJCl-Q
  // Date: Wed, 10 Feb 2017 12:00:00 GMT
  // x-amz-sha256-tree-hash: beb0fe31a1c7ca8c6c04d574ea906e3f97b31fdca7571defb5b44dca89b5af60
  // Location: /111122223333/vaults/examplevault/archives/NkbByEejwEggmBz2fTH ... GlqrEXAMPLEArchiveId
  // x-amz-archive-id: NkbByEejwEggmBz2fTHgJrg0XBoDfjP4q6iu87-TjhqG6eGoOY9Z8i1_AUyUsu ... BfGlqrEXAMPLEArchiveId
  // 

  final archiveId = rest.responseHdrByName('x-amz-archive-id');
  print('x-amz-archive-id = $archiveId');

  final location = rest.responseHdrByName('Location');
  print('Location = $location');
}