(Delphi DLL) Get Google API Access Token using P12 Service Account Key

Demonstrates how to get a Google API access token using a P12 service account key.

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, Pfx, AuthGoogle, Socket;

...

procedure TForm1.Button1Click(Sender: TObject);
var
pfx: HCkPfx;
success: Boolean;
gAuth: HCkAuthGoogle;
tlsSock: HCkSocket;

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

// First load the PKCS12 (.p12 / .pfx) into a PFX object.
pfx := CkPfx_Create();
success := CkPfx_LoadPfxFile(pfx,'qa_data/googleSvcAccountKeys/ChilkatCloud-6ba1b17d6d16.p12','notasecret');
if (success <> True) then
  begin
    Memo1.Lines.Add(CkPfx__lastErrorText(pfx));
    Exit;
  end;

gAuth := CkAuthGoogle_Create();
success := CkAuthGoogle_SetP12(gAuth,pfx);

// Set the client email address.
CkAuthGoogle_putEmailAddress(gAuth,'pip-563@chilkatcloud.iam.gserviceaccount.com');

// Choose a scope.
CkAuthGoogle_putScope(gAuth,'https://www.googleapis.com/auth/cloud-platform');

// Request an access token that is valid for this many seconds.
CkAuthGoogle_putExpireNumSeconds(gAuth,3600);

// If the application is requesting delegated access:
// The email address of the user for which the application is requesting delegated access,
// then set the email address here. (Otherwise leave it empty.)
CkAuthGoogle_putSubEmailAddress(gAuth,'');

// Connect to www.googleapis.com using TLS (TLS 1.2 is the default.)
// The Chilkat socket object is used so that the connection can be established
// through proxies or an SSH tunnel if desired.
tlsSock := CkSocket_Create();
success := CkSocket_Connect(tlsSock,'www.googleapis.com',443,True,5000);
if (success <> True) then
  begin
    Memo1.Lines.Add(CkSocket__lastErrorText(tlsSock));
    Exit;
  end;

// Send the request to obtain the access token.
success := CkAuthGoogle_ObtainAccessToken(gAuth,tlsSock);
if (success <> True) then
  begin
    Memo1.Lines.Add(CkAuthGoogle__lastErrorText(gAuth));
    Exit;
  end;

// Examine the access token:
Memo1.Lines.Add('Access Token: ' + CkAuthGoogle__accessToken(gAuth));

CkPfx_Dispose(pfx);
CkAuthGoogle_Dispose(gAuth);
CkSocket_Dispose(tlsSock);

end;