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

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

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, HttpResponse, Http;

...

procedure TForm1.Button1Click(Sender: TObject);
var
http: HCkHttp;
bucketName: PWideChar;
objectName: PWideChar;
awsService: PWideChar;
httpVerb: PWideChar;
numSecondsValid: Integer;
bUseHttps: Boolean;
preSignedUrl: PWideChar;
resp: HCkHttpResponse;

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 := CkHttp_Create();

CkHttp_putAwsAccessKey(http,'AWS_ACCESS_KEY');
CkHttp_putAwsSecretKey(http,'AWS_SECRET_KEY');

// Make sure to set your AWS region correctly
CkHttp_putAwsRegion(http,'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 := False;

// Generate the pre-signed URL
preSignedUrl := CkHttp__s3_GenPresignedUrl(http,httpVerb,bUseHttps,bucketName,objectName,numSecondsValid,awsService);
if (CkHttp_getLastMethodSuccess(http) = False) then
  begin
    Memo1.Lines.Add(CkHttp__lastErrorText(http));
    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 := CkHttp_PFile(http,'PUT',preSignedUrl,'qa_data/jpg/starfish.jpg','image/jpg',False,False);
if (CkHttp_getLastMethodSuccess(http) = False) then
  begin
    Memo1.Lines.Add(CkHttp__lastErrorText(http));
    Exit;
  end;

Memo1.Lines.Add('response status code = ' + IntToStr(CkHttpResponse_getStatusCode(resp)));
Memo1.Lines.Add('response body size: ' + IntToStr(CkHttpResponse_getContentLength(resp)));
if (CkHttpResponse_getContentLength(resp) > 0) then
  begin
    Memo1.Lines.Add('response body:');
    Memo1.Lines.Add(CkHttpResponse__bodyStr(resp));
  end;
CkHttpResponse_Dispose(resp);

CkHttp_Dispose(http);

end;