Pascal (Lazarus/Delphi)

S3 Rename File

See more Amazon S3 (new) Examples

Demonstrates how to rename a file on Amazon S3.

Renaming an object (file) in AWS S3 using the AWS S3 API involves copying the object to a new location with the desired name and then deleting the original object.

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.StringBuilder;

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

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

begin
  success := False;

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

  rest := TRest.Create;

  //  Connect to the Amazon AWS REST server in the desired region.
  bTls := True;
  port := 443;
  bAutoReconnect := True;
  success := rest.Connect('s3-us-west-2.amazonaws.com',port,bTls,bAutoReconnect);

  //  Provide AWS credentials.
  authAws := TAuthAws.Create;
  authAws.AccessKey := 'AWS_ACCESS_KEY';
  authAws.SecretKey := 'AWS_SECRET_KEY';
  authAws.ServiceName := 's3';

  //  This particular bucket is in the Oregon region, as opposed to the US Standard,
  //  therefore the Region must be set appropriately.
  //  Also note that we connected to "s3-us-west-2.amazonaws.com".
  authAws.Region := 'us-west-2';

  rest.SetAuthAws(authAws);

  //  Set the bucket name via the HOST header.
  //  In this case, the bucket name is "chilkat.qa".
  //  Note that the Host header should use "bucketName.s3.amazonaws.com", not "bucketName.s3-us-west-2.amazonaws.com"
  rest.Host := 'chilkat.qa.s3.amazonaws.com';

  //  Copy /images/sea_creatures/starfish.jpg to /images/sea_creatures/starfish3.jpg
  //  Notice here that the x-amz-copy-source includes the bucket in the source path,
  //  but the target path passed to FullRequestNoBody does NOT contain the bucket (because the bucket
  //  was already specified in the Host header).
  rest.AddHeader('x-amz-copy-source','/chilkat.qa/images/sea_creatures/starfish.jpg');

  sbResponse := TStringBuilder.Create;
  success := rest.FullRequestNoBodySb('PUT','/images/sea_creatures/starfish3.jpg',sbResponse);
  if (success = False) then
    begin
      WriteLn(rest.LastErrorText);
      Exit;
    end;

  //  When successful, the S3 Storage service will respond with a 200 or 204 response code,
  //  with an XML body.  
  if (rest.ResponseStatusCode <> 200) then
    begin
      //  Examine the request/response to see what happened.
      WriteLn('response status code = ' + rest.ResponseStatusCode);
      WriteLn('response status text = ' + rest.ResponseStatusText);
      WriteLn('response header: ' + rest.ResponseHeader);
      WriteLn('response body: ' + sbResponse.GetAsString());
      WriteLn('---');
      WriteLn('LastRequestStartLine: ' + rest.LastRequestStartLine);
      WriteLn('LastRequestHeader: ' + rest.LastRequestHeader);
    end;

  WriteLn(sbResponse.GetAsString());
  WriteLn('Copy Successful.');

  //  --------------------------------------
  //  Now we can delete the original file..
  //  --------------------------------------

  //  We no longer want to send the x-amz-copy-source header.  Remove it.
  rest.RemoveHeader('x-amz-copy-source');

  success := rest.FullRequestNoBodySb('DELETE','/images/sea_creatures/starfish.jpg',sbResponse);
  if (success = False) then
    begin
      WriteLn(rest.LastErrorText);
      Exit;
    end;

  //  If successfully deleted, the response status code is 204 and the response body text will be empty.
  statusCode := rest.ResponseStatusCode;
  WriteLn('Response status code = ' + statusCode);
  WriteLn('Response text = ');
  WriteLn(sbResponse.GetAsString());


  rest.Free;
  authAws.Free;
  sbResponse.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.