(Delphi ActiveX) Get a Google Drive Access Token using a .p12 Private Key

Demonstrates how to get a Google Drive API access token using a .p12 private key.

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
gAuth: TChilkatAuthGoogle;
pfx: TChilkatPfx;
success: Integer;
tlsSock: TChilkatSocket;

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

gAuth := TChilkatAuthGoogle.Create(Self);

pfx := TChilkatPfx.Create(Self);
success := pfx.LoadPfxFile('qa_data/googleApi/ChilkatTest-5ba79ce39459.p12','notasecret');
if (success <> 1) then
  begin
    Memo1.Lines.Add(pfx.LastErrorText);
    Exit;
  end;

success := gAuth.SetP12(pfx.ControlInterface);
if (success <> 1) then
  begin
    Memo1.Lines.Add(gAuth.LastErrorText);
    Exit;
  end;

// Choose a scope.
gAuth.Scope := 'https://www.googleapis.com/auth/drive';

// Request an access token that is valid for this many seconds.
gAuth.ExpireNumSeconds := 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.)
gAuth.SubEmailAddress := 'support@chilkatcloud.com';

gAuth.EmailAddress := '597922945226-00rb0ppfg0snd9jo6bhvd4v17jtj2d3a@developer.gserviceaccount.com';

// 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 := TChilkatSocket.Create(Self);
success := tlsSock.Connect('www.googleapis.com',443,1,5000);
if (success <> 1) then
  begin
    Memo1.Lines.Add(tlsSock.LastErrorText);
    Exit;
  end;

// Send the request to obtain the access token.
success := gAuth.ObtainAccessToken(tlsSock.ControlInterface);
if (success <> 1) then
  begin
    Memo1.Lines.Add(gAuth.LastErrorText);
    Exit;
  end;

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