Pascal (Lazarus/Delphi)

Rabobank Refresh OAuth2 Access Token

See more OAuth2 Examples

Demonstrates how to refresh an expired Rabobank OAuth2 access token. (No interactive user interaction is required to refresh an access token.) 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.Http,
  Chilkat.HttpRequest,
  Chilkat.HttpResponse,
  Chilkat.JsonObject,
  Chilkat.FileAccess;

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

procedure RunDemo;
var
  success: Boolean;
  json: TJsonObject;
  req: THttpRequest;
  http: THttp;
  resp: THttpResponse;
  fac: TFileAccess;

begin
  success := False;

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

  //  We previously obtained an access token and saved the JSON to a file using this example:
  //  Get Rabobank OAuth2 Access Token

  json := TJsonObject.Create;
  success := json.LoadFile('qa_data/tokens/rabobank.json');
  if (success <> True) then
    begin
      Exit;
    end;

  //  {
  //    "token_type": "Bearer",
  //    "access_token": "AAIkYTU0ZWM ... sxE0KL0HHWw",
  //    "expires_in": 3600,
  //    "consented_on": 1584641121,
  //    "scope": "ais.balances.read ais.transactions.read-90days ais.transactions.read-history",
  //    "refresh_token": "AAJXXSdN ... Uiblz9ILkxNBlytRGA",
  //    "refresh_token_expires_in": 157784760,
  //    "expires_on": "1584644722"
  //  }

  //  Refresh the access token by sending a POST like this:
  //  

  //  POST /oauth2/token
  //  Headers:
  //      Content-Type: application/x-www-form-urlencoded
  //      Authorization: Basic BASE64(CLIENT_ID + ":" + CLIENT_SECRET)
  //  
  //  Body (x-www-form-urlencoded):
  //      grant_type: refresh_token
  //      refresh_token: REFRESH_TOKEN

  req := THttpRequest.Create;
  req.AddParam('grant_type','refresh_token');
  req.AddParam('refresh_token',json.StringOf('refresh_token'));

  http := THttp.Create;

  //  Causes the "Authorization: Basic BASE64(CLIENT_ID + ":" + CLIENT_SECRET)" header to be added..
  http.BasicAuth := True;
  http.Login := 'YOUR_APP_CLIENT_ID';
  http.Password := 'YOUR_APP_CLIENT_SECRET';

  req.HttpVerb := 'POST';
  req.ContentType := 'application/x-www-form-urlencoded';

  resp := THttpResponse.Create;
  success := http.HttpReq('https://api-sandbox.rabobank.nl/openapi/sandbox/oauth2/token',req,resp);
  if (success = False) then
    begin
      WriteLn(http.LastErrorText);
      Exit;
    end;

  //  Load the JSON response.
  json.Load(resp.BodyStr);
  json.EmitCompact := False;

  //  Show the JSON response.
  WriteLn(json.Emit());

  WriteLn('Response status code: ' + resp.StatusCode);

  //  If the response status code is not 200, then it's an error.
  if (resp.StatusCode <> 200) then
    begin
      Exit;
    end;

  //  Save the refreshed access token JSON to a file for future requests.
  fac := TFileAccess.Create;
  fac.WriteEntireTextFile('qa_data/tokens/rabobank.json',json.Emit(),'utf-8',False);


  json.Free;
  req.Free;
  http.Free;
  resp.Free;
  fac.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.