(Delphi ActiveX) S3 Upload String using AWS Signature Version 2

Example to upload the contents of a string to the Amazon S3 service, using the older AWS Signature Version 2.

Chilkat for Delphi Downloads Chilkat ActiveX DLL for Delphi Chilkat non-ActiveX DLL for Delphi * The examples here use the ActiveX DLL.

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Chilkat_TLB;

...

procedure TForm1.Button1Click(Sender: TObject);
var
rest: TChilkatRest;
bTls: Integer;
port: Integer;
bAutoReconnect: Integer;
success: Integer;
authAws: TChilkatAuthAws;
fac: TCkFileAccess;
fileContents: WideString;
responseBodyStr: WideString;
statusCode: Integer;

begin
// Demonstrates how to use older AWS S3 Signature Version 2 for uploading the contents
// of a string variable to an object in a bucket.

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

rest := TChilkatRest.Create(Self);

// Connect to the Amazon AWS REST server.
bTls := 1;
port := 443;
bAutoReconnect := 1;
// The file is uploaded to the bucket named "chilkat100", which becomes part of the domain:
success := rest.Connect('chilkat100.s3.amazonaws.com',port,bTls,bAutoReconnect);

// ----------------------------------------------------------------------------
// Important: For buckets created in regions outside us-east-1,
// there are three important changes that need to be made.
// See Working with S3 Buckets in Non-us-east-1 Regions for the details.
// ----------------------------------------------------------------------------

// Provide AWS credentials for the REST call.
authAws := TChilkatAuthAws.Create(Self);
authAws.AccessKey := 'AWS_ACCESS_KEY';
authAws.SecretKey := 'AWS_SECRET_KEY';
authAws.ServiceName := 's3';

// For AWS Signature Version 2, the following two properties need to be set:
authAws.SignatureVersion := 2;
// See http://docs.aws.amazon.com/AmazonS3/latest/dev/RESTAuthentication.html#ConstructingTheCanonicalizedResourceElement
// The bucket is "chilkat100", and the uriPath is "/hamlet_play.xml", which must match
// the URI path passed to the FullRequestString method below.
authAws.CanonicalizedResourceV2 := '/chilkat100/hamlet_play.xml';

success := rest.SetAuthAws(authAws.ControlInterface);

// Load a text file into memory.
fac := TCkFileAccess.Create(Self);
fileContents := fac.ReadEntireTextFile('qa_data/xml/hamlet.xml','utf-8');
if (fac.LastMethodSuccess <> 1) then
  begin
    Memo1.Lines.Add(fac.LastErrorText);
    Exit;
  end;

// To send the file in gzip or deflate compressed format, set the Content-Encoding request
// header to "gzip" or "deflate".  (this is optional)
success := rest.AddHeader('Content-Encoding','gzip');

// Indicate the Content-Type of our upload.  (This is optional)
success := rest.AddHeader('Content-Type','text/xml');

// We can add an "Expect: 100-continue" header so that if the request is rejected
// by the server immediately after receiving the request header, it can respond
// and the client (Chilkat) can avoid sending the file data.
// (this is optional)
success := rest.AddHeader('Expect','100-continue');

// Upload the file to Amazon S3.
responseBodyStr := rest.FullRequestString('PUT','/hamlet_play.xml',fileContents);
if (rest.LastMethodSuccess <> 1) then
  begin
    Memo1.Lines.Add(rest.LastErrorText);
    Exit;
  end;

// Did we get a 200 response indicating success?
statusCode := rest.ResponseStatusCode;
if (statusCode <> 200) then
  begin
    Memo1.Lines.Add('Error response: ' + responseBodyStr);
    Memo1.Lines.Add('Status code: ' + IntToStr(statusCode) + ', Status text: ' + rest.ResponseStatusText);
    Exit;
  end;

Memo1.Lines.Add('File successfully uploaded.');
end;