Dart

Download S3 CloudTrail Log and Un-Gzip

See more Amazon S3 Examples

Demonstrates how to download a Amazon CloudTrail log from an S3 bucket. The file in this example is a .json.gz. The file is uncompressed and the JSON parsed. Dart

import 'package:chilkat/chilkat.dart';

void main() {
  // This requires the Chilkat API to have been previously unlocked.
  // See Global Unlock Sample for sample code.

  final http = CkHttp();

  http.awsAccessKey = 'AWS_ACCESS_KEY';
  http.awsSecretKey = 'AWS_SECRET_KEY';
  http.awsRegion = 'us-west-2';
  http.awsEndpoint = 's3-us-west-2.amazonaws.com';

  final bucketName = 'chilkat.logs';
  final objectName = '/AWSLogs/957491831129/CloudTrail/us-west-1/2016/11/12/957491831129_CloudTrail_us-west-1_20161112T1335Z_umXfD4RxHE5nDGuI.json.gz';
  final localFilePath = 'qa_output/cloudTrailLog.json.gz';

  try {
    http.s3DownloadFile(bucketName, objectName, localFilePath);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  final statusCode = http.lastStatus;
  if (statusCode != 200) {
    print('Failed to download, response status code = $statusCode');
    return;
  }

  final jsonPath = 'qa_output/cloudTrailLog.json';
  final gzip = CkGzip();
  try {
    gzip.uncompressFile(localFilePath, jsonPath);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  final json = CkJsonObject();
  json.loadFile(jsonPath);
  json.emitCompact = false;
  print(json.emit());

  // Sample JSON is shown below.
  // Go to http://tools.chilkat.io/jsonParse.cshtml 
  // and copy/paste the JSON into the online tool to generate parsing code.

  // {
  //   "Records": [
  //     {
  //       "eventVersion": "1.05",
  //       "userIdentity": {
  //         "type": "Root",
  //         "principalId": "954591834127",
  //         "arn": "arn:aws:iam::954591834127:root",
  //         "accountId": "954591834127",
  //         "accessKeyId": "ASIAJ3DEMXUXI43B6FYQ",
  //         "sessionContext": {
  //           "attributes": {
  //             "mfaAuthenticated": "false",
  //             "creationDate": "2016-11-12T13:09:31Z"
  //           }
  //         }
  //       },
  //       "eventTime": "2016-11-12T13:34:39Z",
  //       "eventSource": "cloudtrail.amazonaws.com",
  //       "eventName": "DescribeTrails",
  //       "awsRegion": "us-west-1",
  //       "sourceIPAddress": "98.228.98.57",
  //       "userAgent": "console.amazonaws.com",
  //       "requestParameters": {
  //         "trailNameList": [
  //         ]
  //       },
  //       "responseElements": null,
  //       "requestID": "c2a0376c-a8dc-11e6-89e7-85ac5ce5ee56",
  //       "eventID": "eb5afd70-dae1-41f0-82b4-91c3c936d9ba",
  //       "eventType": "AwsApiCall",
  //       "recipientAccountId": "954591834127"
  //     }
  //   ]
  // }
}