Configure Google Service Account Authentication for REST

See more REST Examples

Demonstrates Rest.SetAuthGoogle, which associates an AuthGoogle provider so Chilkat supplies a Google OAuth 2.0 bearer token on each request. The provider is configured with a service account JSON key and the required OAuth scope.

The file path is relative to the application's current working directory. An absolute path may also be used. Supply the path appropriate to your own environment.

program ChilkatDemo;

// Demonstrates using the Chilkat Pascal wrapper via the C bridge DLL.
// Builds as a console application under Lazarus (FPC) or Delphi.

{$IFDEF FPC}
  {$MODE DELPHI}
{$ENDIF}
{$APPTYPE CONSOLE}

uses
  {$IFDEF UNIX}
  cthreads,
  {$ENDIF}
  SysUtils,
  CkDllLoader,
  Chilkat.StringBuilder,
  Chilkat.AuthGoogle,
  Chilkat.Rest;

// ---------------------------------------------------------------------------

procedure RunDemo;
var
  success: Boolean;
  rest: TRest;
  bTls: Boolean;
  bAutoReconnect: Boolean;
  gAuth: TAuthGoogle;
  sbJsonKey: TStringBuilder;
  bLoaded: Boolean;
  jsonKey: string;
  responseText: string;

begin
  success := False;

  rest := TRest.Create;
  bTls := True;
  bAutoReconnect := True;
  success := rest.Connect('example.com',443,bTls,bAutoReconnect);
ERROR: "=" expected
ERROR: Undefined variable(CHECK_SUCCESS)

  //  Configure Google service-account authentication.  Load the service account JSON key and set the
  //  required OAuth scope(s).
  gAuth := TAuthGoogle.Create;

  sbJsonKey := TStringBuilder.Create;
  bLoaded := sbJsonKey.LoadFile('qa_data/service_account.json');
  if (bLoaded <> True) then
    begin
      WriteLn('Failed to load the service account JSON key.');
      Exit;
    end;
  jsonKey := sbJsonKey.GetAsString();
  if (sbJsonKey.LastMethodSuccess = False) then
    begin
      WriteLn(sbJsonKey.LastErrorText);
      Exit;
    end;
  gAuth.JsonKey := jsonKey;

  //  A space-delimited list of the requested permissions.
  gAuth.Scope := 'https://www.googleapis.com/auth/cloud-platform';

  //  Associate the provider so Chilkat supplies a Google bearer token on each request.
  success := rest.SetAuthGoogle(gAuth);
ERROR: "=" expected
ERROR: Undefined variable(CHECK_SUCCESS)

  responseText := rest.FullRequestNoBody('GET','/storage/v1/b?project=my-project');
ERROR: "=" expected
ERROR: Undefined variable(CHECK_LMS)

  WriteLn(responseText);


  rest.Free;
  gAuth.Free;
  sbJsonKey.Free;

end;

// ---------------------------------------------------------------------------

begin

  try
    RunDemo;
  except
    on E: Exception do
      WriteLn('Unhandled exception: ', E.ClassName, ': ', E.Message);
  end;

  WriteLn;
  {$IFDEF MSWINDOWS}
  WriteLn('Press Enter to exit...');
  ReadLn;
  {$ENDIF}
end.