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

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

...

procedure TForm1.Button1Click(Sender: TObject);
var
rest: HCkRest;
bTls: Boolean;
port: Integer;
bAutoReconnect: Boolean;
success: Boolean;
authAws: HCkAuthAws;
fac: HCkFileAccess;
fileContents: PWideChar;
responseBodyStr: PWideChar;
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 := CkRest_Create();

// Connect to the Amazon AWS REST server.
bTls := True;
port := 443;
bAutoReconnect := True;
// The file is uploaded to the bucket named "chilkat100", which becomes part of the domain:
success := CkRest_Connect(rest,'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 := CkAuthAws_Create();
CkAuthAws_putAccessKey(authAws,'AWS_ACCESS_KEY');
CkAuthAws_putSecretKey(authAws,'AWS_SECRET_KEY');
CkAuthAws_putServiceName(authAws,'s3');

// For AWS Signature Version 2, the following two properties need to be set:
CkAuthAws_putSignatureVersion(authAws,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.
CkAuthAws_putCanonicalizedResourceV2(authAws,'/chilkat100/hamlet_play.xml');

success := CkRest_SetAuthAws(rest,authAws);

// Load a text file into memory.
fac := CkFileAccess_Create();
fileContents := CkFileAccess__readEntireTextFile(fac,'qa_data/xml/hamlet.xml','utf-8');
if (CkFileAccess_getLastMethodSuccess(fac) <> True) then
  begin
    Memo1.Lines.Add(CkFileAccess__lastErrorText(fac));
    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 := CkRest_AddHeader(rest,'Content-Encoding','gzip');

// Indicate the Content-Type of our upload.  (This is optional)
success := CkRest_AddHeader(rest,'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 := CkRest_AddHeader(rest,'Expect','100-continue');

// Upload the file to Amazon S3.
responseBodyStr := CkRest__fullRequestString(rest,'PUT','/hamlet_play.xml',fileContents);
if (CkRest_getLastMethodSuccess(rest) <> True) then
  begin
    Memo1.Lines.Add(CkRest__lastErrorText(rest));
    Exit;
  end;

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

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

CkRest_Dispose(rest);
CkAuthAws_Dispose(authAws);
CkFileAccess_Dispose(fac);

end;