Pascal (Lazarus/Delphi)

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. Pascal (Lazarus/Delphi)

program ChilkatDemo;

// Demonstrates using the Chilkat Pascal wrapper via the C bridge DLL.
// Builds as a console application under Lazarus (FPC) or Delphi.

{$IFDEF FPC}
  {$MODE DELPHI}
{$ENDIF}
{$APPTYPE CONSOLE}

uses
  {$IFDEF UNIX}
  cthreads,
  {$ENDIF}
  SysUtils,
  CkDllLoader,
  Chilkat.Http,
  Chilkat.Gzip,
  Chilkat.JsonObject;

// ---------------------------------------------------------------------------

procedure RunDemo;
var
  success: Boolean;
  http: THttp;
  bucketName: string;
  objectName: string;
  localFilePath: string;
  statusCode: Integer;
  jsonPath: string;
  gzip: TGzip;
  json: TJsonObject;

begin
  success := False;

  //  This requires the Chilkat API to have been previously unlocked.
  //  See Global Unlock Sample for sample code.

  http := THttp.Create;

  http.AwsAccessKey := 'AWS_ACCESS_KEY';
  http.AwsSecretKey := 'AWS_SECRET_KEY';
  http.AwsRegion := 'us-west-2';
  http.AwsEndpoint := 's3-us-west-2.amazonaws.com';

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

  success := http.S3_DownloadFile(bucketName,objectName,localFilePath);
  if (success <> True) then
    begin
      WriteLn(http.LastErrorText);
      Exit;
    end;

  statusCode := http.LastStatus;
  if (statusCode <> 200) then
    begin
      WriteLn('Failed to download, response status code = ' + statusCode);
      Exit;
    end;

  jsonPath := 'qa_output/cloudTrailLog.json';
  gzip := TGzip.Create;
  success := gzip.UncompressFile(localFilePath,jsonPath);
  if (success = False) then
    begin
      WriteLn(gzip.LastErrorText);
      Exit;
    end;

  json := TJsonObject.Create;
  json.LoadFile(jsonPath);
  json.EmitCompact := False;
  WriteLn(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"
  //      }
  //    ]
  //  }


  http.Free;
  gzip.Free;
  json.Free;

end;

// ---------------------------------------------------------------------------

begin

  try
    RunDemo;
  except
    on E: Exception do
      WriteLn('Unhandled exception: ', E.ClassName, ': ', E.Message);
  end;

  WriteLn;
  {$IFDEF MSWINDOWS}
  WriteLn('Press Enter to exit...');
  ReadLn;
  {$ENDIF}
end.