Dart Requires Chilkat v10.1.2+

GeoOp OAuth2 Authorisation Code Grant (Public App)

See more OAuth2 Examples

Demonstrates how to get an access token for a GeoOp Third-Party Public Application using the Authorisation Code Grant flow. Dart

import 'package:chilkat/chilkat.dart';

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

  final oauth2 = CkOAuth2();

  // This should match the Site URL configured for your GeoOp (non-Server) Application, such as "http://localhost:3017/"
  oauth2.listenPort = 3017;

  oauth2.authorizationEndpoint = 'https://login.geoop.com/oauth2/code';
  oauth2.tokenEndpoint = 'https://login.geoop.com/oauth2/token';

  // Replace the client ID with an actual value.
  oauth2.clientId = 'GEOOP-APPLICATION-ID';
  // The ClientSecret should remain empty for a GeoOp public application
  oauth2.clientSecret = '';

  // We need a few special settings for GeoOp
  oauth2.scope = 'default';
  oauth2.codeChallenge = false;
  // Setting LocalHost equal to "none" prevents the "redirect_uri" query param from being sent in the initial HTTP request.
  // Note: The GeoOp Application should still have a redirect URL specified as "http://localhost:3017/", where the port
  // number matches the ListenPort above.
  oauth2.localHost = 'none';

  // Begin the OAuth2 Authorization code flow.  This returns a URL that should be loaded in a browser.
  final String url;
  try {
    url = oauth2.startAuth();
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // Launch the default browser on the system and navigate to the url.
  // The LaunchBrowser method was added in Chilkat v10.1.2.
  try {
    oauth2.launchBrowser(url);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // Wait for the user to approve or deny authorization in the browser.
  var numMsWaited = 0;
  while ((numMsWaited < 90000) && (oauth2.authFlowState < 3)) {
    oauth2.sleepMs(100);
    numMsWaited += 100;
  }

  // If the browser does not respond within the specified time, AuthFlowState will be:
  // 
  // 1: Waiting for Redirect – The OAuth2 background thread is waiting for the browser's redirect request.
  // 2: Waiting for Final Response – The thread is awaiting the final access token response.
  // In either case, cancel the background task initiated by StartAuth.

  if (oauth2.authFlowState < 3) {
    oauth2.cancel();
    print('No response from the browser!');
    return;
  }

  // Check AuthFlowState to determine if authorization was granted, denied, or failed:
  // 
  // 3: Success – OAuth2 flow completed, the background thread exited, and the successful response is in AccessTokenResponse.
  // 4: Access Denied – OAuth2 flow completed, the background thread exited, and the error response is in AccessTokenResponse.
  // 5: Failure – OAuth2 flow failed before completion, the background thread exited, and error details are in FailureInfo.

  if (oauth2.authFlowState == 5) {
    print('OAuth2 failed to complete.');
    print(oauth2.failureInfo);
    return;
  }

  if (oauth2.authFlowState == 4) {
    print('OAuth2 authorization was denied.');
    print(oauth2.accessTokenResponse);
    return;
  }

  if (oauth2.authFlowState != 3) {
    print('Unexpected AuthFlowState:${oauth2.authFlowState}');
    return;
  }

  print('OAuth2 authorization granted!');
  print('Access Token = ${oauth2.accessToken}');

  // Save the entire JSON response, which includes the access token, for future calls.
  // The JSON AccessTokenResponse looks like this:
  // {"access_token":"e6dqdG....mzjpT04w==","token_type":"Bearer","expires_in":2592000,"owner_id":984236}

  final fac = CkFileAccess();
  fac.writeEntireTextFile('qa_data/tokens/geoop.json', oauth2.accessTokenResponse, 'utf-8', false);

  print('Success.');
}