Pascal (Lazarus/Delphi)

Salesforce OAuth2 Refresh Access Token

See more OAuth2 Examples

Demonstrates how to refresh a Salesforce Access Token.

Note: Use Chilkat v10.1.2 or later for this example.

Pascal (Lazarus/Delphi)

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.OAuth2,
  Chilkat.StringBuilder,
  Chilkat.JsonObject;

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

procedure RunDemo;
var
  success: Boolean;
  jsonToken: TJsonObject;
  oauth2: TOAuth2;
  sbJson: TStringBuilder;

begin
  success := False;

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

  //  It is assumed we previously obtained an OAuth2 access token.
  //  This example loads the JSON access token file 
  //  saved by this example: Get SalesForce OAuth2 Access Token via Authorization Flow

  jsonToken := TJsonObject.Create;
  success := jsonToken.LoadFile('qa_data/tokens/_salesforce.json');
  if (success <> True) then
    begin
      WriteLn('Failed to load _salesforce.json');
      Exit;
    end;

  //  This is an example of a Salesforce OAuth2 access token to be refreshed:

  //  {
  //    "access_token": "00D41000....uLZBpT6",
  //    "refresh_token": "5Aep....25xdGgkrV",
  //    "signature": "cjTbSc5DvcKpaMoRTzuQTJLb1tcMw8LEO01flq4aMD4=",
  //    "scope": "refresh_token id",
  //    "instance_url": "https://d41000000f8a0eak-dev-ed.my.salesforce.com",
  //    "id": "https://login.salesforce.com/id/00D41000000F8A0EAK/005410000....xAAE",
  //    "token_type": "Bearer",
  //    "issued_at": "1738348388166"
  //  }

  oauth2 := TOAuth2.Create;

  oauth2.TokenEndpoint := 'https://login.salesforce.com/services/oauth2/token';

  //  Replace this with your actual client ID (Consumer Key)
  oauth2.ClientId := 'CLIENT_ID';

  //  Note: The client secret is not required because we configured our Connected App
  //  to not require it for the refresh flow.  See the screenshot below.

  //  Get the "refresh_token"
  oauth2.RefreshToken := jsonToken.StringOf('refresh_token');

  //  Send the HTTP POST to refresh the access token..
  success := oauth2.RefreshAccessToken();
  if (success <> True) then
    begin
      WriteLn(oauth2.LastErrorText);
      Exit;
    end;

  //  The response contains a new access token, but we must keep
  //  our existing refresh token for when we need to refresh again in the future.
  jsonToken.UpdateString('access_token',oauth2.AccessToken);

  //  Save the new JSON access token response to a file.
  sbJson := TStringBuilder.Create;
  jsonToken.EmitCompact := False;
  jsonToken.EmitSb(sbJson);
  sbJson.WriteFile('qa_data/tokens/_salesforce.json','utf-8',False);

  WriteLn('OAuth2 authorization granted!');
  WriteLn('New Access Token = ' + oauth2.AccessToken);

  //  --------------------------------------------------------------------------
  //  Here's a screenshot of a Salesforce Connected App 
  //  which does not requires the secret for the authorization or refresh flow.
  //  


  jsonToken.Free;
  oauth2.Free;
  sbJson.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.