Dart Requires Chilkat v11.0.0+

Calendar: Refresh Expired OAuth2 Access Token

See more Microsoft Calendar Examples

Refreshes an expired OAuth2 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.

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

  final req = CkHttpRequest();
  req.addParam('grant_type', 'refresh_token');
  req.addParam('redirect_uri', 'http://localhost:3017/');
  req.addParam('client_id', 'MICROSOFT-GRAPH-CLIENT-ID');
  req.addParam('client_secret', 'MICROSOFT-GRAPH-CLIENT-SECRET');
  req.addParam('refresh_token', json.stringOf('refresh_token'));
  req.addParam('scope', 'openid profile offline_access user.readwrite calendars.readwrite files.readwrite');

  final http = CkHttp();

  req.httpVerb = 'POST';
  req.contentType = 'application/x-www-form-urlencoded';

  final resp = CkHttpResponse();
  try {
    http.httpReq('https://login.microsoftonline.com/common/oauth2/v2.0/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/msGraphCalendar.json', json.emit(), 'utf-8', false);

  print('Success.');
}