Dart

Rabobank Refresh OAuth2 Access Token

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Demonstrates how to refresh an expired Rabobank OAuth2 access token. (No interactive user interaction is required to refresh an access token.) Dart

import 'package:chilkat/chilkat.dart';

void main() {
  // 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

  final json = CkJsonObject();
  try {
    json.loadFile('qa_data/tokens/rabobank.json');
  } on ChilkatException {
    return;
  }

  // {
  //   "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

  final req = CkHttpRequest();
  req.addParam('grant_type', 'refresh_token');
  req.addParam('refresh_token', json.stringOf('refresh_token'));

  final http = CkHttp();

  // 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';

  final resp = CkHttpResponse();
  try {
    http.httpReq('https://api-sandbox.rabobank.nl/openapi/sandbox/oauth2/token', req, resp);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // Load the JSON response.
  json.load(resp.bodyStr);
  json.emitCompact = false;

  // Show the JSON response.
  print(json.emit());

  print('Response status code: ${resp.statusCode}');

  // If the response status code is not 200, then it's an error.
  if (resp.statusCode != 200) {
    return;
  }

  // Save the refreshed access token JSON to a file for future requests.
  final fac = CkFileAccess();
  fac.writeEntireTextFile('qa_data/tokens/rabobank.json', json.emit(), 'utf-8', false);
}