Pascal (Lazarus/Delphi)

S3 - Working with Buckets in a Region

See more Amazon S3 (new) Examples

Demonstrates how to work with S3 buckets located in a particular region. 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.AuthAws,
  Chilkat.Rest,
  Chilkat.BinData,
  Chilkat.StringBuilder;

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

procedure RunDemo;
var
  success: Boolean;
  rest: TRest;
  bTls: Boolean;
  port: Integer;
  bAutoReconnect: Boolean;
  authAws: TAuthAws;
  fileData: TBinData;
  responseBody: TStringBuilder;
  statusCode: Integer;

begin
  success := False;

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

  //  When usig the REST class to access an S3 bucket that has been created in a particular region,
  //  there are three important things to remember:
  //  
  //  1) Connect to the domain that includes the region.  For example, instead of connecting to
  //     "s3.amazonaws.com", connect to "s3.eu-central-1.amazonaws.com" if your bucket is in the EU Frankfurt region.
  //     See http://docs.aws.amazon.com/general/latest/gr/rande.html#s3_region   for a list of S3 region domains (endpoints)
  //  
  //  2) Set the AuthAws.Region property equal to the region, such as "eu-central-1".
  //  
  //  3) Include the region in request's Host header.
  //  

  //  This example will upload to a bucket in the eu-central-1 region.
  //  
  rest := TRest.Create;

  //  Connect to the Amazon AWS REST server.
  bTls := True;
  port := 443;
  bAutoReconnect := True;
  success := rest.Connect('s3.eu-central-1.amazonaws.com',port,bTls,bAutoReconnect);

  //  Provide AWS credentials for the REST call.
  authAws := TAuthAws.Create;
  authAws.AccessKey := 'AWS_ACCESS_KEY';
  authAws.SecretKey := 'AWS_SECRET_KEY';
  authAws.ServiceName := 's3';
  authAws.Region := 'eu-central-1';
  success := rest.SetAuthAws(authAws);

  //  Set the bucket name via the HOST header.
  //  In this case, the bucket name is "chilkateufrankfurt" (which was created in the eu-central-1 region)
  rest.Host := 'chilkateufrankfurt.s3.eu-central-1.amazonaws.com';

  fileData := TBinData.Create;
  success := fileData.LoadFile('qa_data/jpg/starfish.jpg');

  //  Upload the file to Amazon S3.
  responseBody := TStringBuilder.Create;
  success := rest.FullRequestBd('PUT','/starfish.jpg',fileData,responseBody);
  if (success <> True) then
    begin
      WriteLn(rest.LastErrorText);
      Exit;
    end;

  //  Did we get a 200 response indicating success?
  statusCode := rest.ResponseStatusCode;
  if (statusCode <> 200) then
    begin
      WriteLn('Error response: ' + responseBody.GetAsString());
      WriteLn('Status code: ' + statusCode + ', Status text: ' + rest.ResponseStatusText);
      Exit;
    end;

  WriteLn('File successfully uploaded.');


  rest.Free;
  authAws.Free;
  fileData.Free;
  responseBody.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.