Dart

GeoOp Exchange Refresh Token for New Access Token

See more GeoOp Examples

Demonstrates how to use the /oauth2/token endpoint to exchange it for a new access token once the current access token has expired.

Note: This example requires Chilkat v9.5.0.65 or greater.

Dart

import 'package:chilkat/chilkat.dart';

void main() {
  // This example assumes the Chilkat API to have been previously unlocked.
  // See Global Unlock Sample for sample code.

  // This example also assumes that OAuth2 access and refresh tokens were previously fetched.
  // and saved in a JSON file.  

  // First get our previously obtained refresh token.
  // { .... "refresh_token":"e6dqdG....mzjpT04w==", .... }
  final jsonToken = CkJsonObject();
  jsonToken.loadFile('qa_data/tokens/geoop.json');

  final rest = CkRest();

  // Connect to GeoOp...
  final bAutoReconnect = true;
  try {
    rest.connect('login.geoop.com', 443, true, bAutoReconnect);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // Set the X-Version header.
  rest.addHeader('X-Version', '1.0');

  // Provide the required form params to get the new access token
  print('refresh_token = ${jsonToken.stringOf('refresh_token')}');
  rest.addQueryParam('refresh_token', jsonToken.stringOf('refresh_token'));
  rest.addQueryParam('grant_type', 'refresh_token');
  rest.addQueryParam('client_id', 'GEOOP-CLIENT-ID');
  rest.addQueryParam('client_secret', 'GEOOP-CLIENT-SECRET');

  final String responseBody;
  try {
    responseBody = rest.fullRequestFormUrlEncoded('POST', '/oauth2/token');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // If the response status code did not indicate success, then see what happened..
  if (rest.responseStatusCode != 200) {
    print('Request Header: ');
    print(rest.lastRequestHeader);
    print('----');
    print('Response StatusCode = ${rest.responseStatusCode}');
    print('Response StatusLine: ${rest.responseStatusText}');
    print('Response Header:');
    print(rest.responseHeader);
    print(responseBody);
    return;
  }

  final json = CkJsonObject();
  json.emitCompact = false;
  json.load(responseBody);

  // Show the full JSON response.  It should contain the new access token...
  print(json.emit());
}