(Delphi ActiveX) Create S3 Pre-Signed URL for Upload

Demonstrates how to generate a pre-signed URL for S3 uploads.

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
http: TChilkatHttp;
bucketName: WideString;
objectName: WideString;
awsService: WideString;
httpVerb: WideString;
numSecondsValid: Integer;
bUseHttps: Integer;
preSignedUrl: WideString;
resp: IChilkatHttpResponse;

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

// Note: This example requires Chilkat v9.5.0.83 or greater.

http := TChilkatHttp.Create(Self);

http.AwsAccessKey := 'AWS_ACCESS_KEY';
http.AwsSecretKey := 'AWS_SECRET_KEY';

// Make sure to set your AWS region correctly
http.AwsRegion := 'us-east-1';

bucketName := 'chilkat200';
objectName := 'starfish/starfish.jpg';
awsService := 's3';
httpVerb := 'PUT';

// The signed URL will be valid for this number of seconds:
numSecondsValid := 86400;

// Choose between a URL beginning with "http://" or "https://"...
bUseHttps := 0;

// Generate the pre-signed URL
preSignedUrl := http.S3_GenPresignedUrl(httpVerb,bUseHttps,bucketName,objectName,numSecondsValid,awsService);
if (http.LastMethodSuccess = 0) then
  begin
    Memo1.Lines.Add(http.LastErrorText);
    Exit;
  end;

Memo1.Lines.Add('Presigned URL for Upload: ' + preSignedUrl);

// Here's an example of a pre-signed URL
// 
// http://chilkat200.s3.amazonaws.com/starfish/starfish.jpg?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=AKIAIBJLOVZVXAU2AFUA%2F20200623%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Date=20200623T234049Z&X-Amz-Expires=86400&X-Amz-SignedHeaders=host&X-Amz-Signature=xxxxxeaea071178d772856c0a4e4c0114a8d9992f0d0812955e490d0exxxxxxx
// 

// You can use the pre-signed URL to upload from Chilkat
// For example, upload by streaming from a local file
resp := http.PFile('PUT',preSignedUrl,'qa_data/jpg/starfish.jpg','image/jpg',0,0);
if (http.LastMethodSuccess = 0) then
  begin
    Memo1.Lines.Add(http.LastErrorText);
    Exit;
  end;

Memo1.Lines.Add('response status code = ' + IntToStr(resp.StatusCode));
Memo1.Lines.Add('response body size: ' + IntToStr(resp.ContentLength));
if (resp.ContentLength > 0) then
  begin
    Memo1.Lines.Add('response body:');
    Memo1.Lines.Add(resp.BodyStr);
  end;
end;