Dart

Constant Contact (v3) OAuth2 Access Token

See more Constant Contact Examples

Gets an OAuth2 access token for ConstantContact. 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 oauth2 = CkOAuth2();

  // This should be the port in the localhost callback URL for your app.  
  // The callback URL would look like "http://localhost:3017/" if the port number is 3017.
  // Make sure when defining your application (i.e. "My Applications" at  https://app.constantcontact.com/pages/dma/portal/)
  // that the Redirect URI is exactly this:  "http://localhost:3017/".   You may use any port number as long as it agrees
  // with the ListenPort here.  It is important to use "http" and not "https" in the callback URI.  The trailing "/" is also important.
  oauth2.listenPort = 3017;

  oauth2.authorizationEndpoint = 'https://api.cc.email/v3/idfed';
  oauth2.tokenEndpoint = 'https://idfed.constantcontact.com/as/token.oauth2';

  // Replace these with actual values.
  oauth2.clientId = 'CLIENT_KEY';
  oauth2.clientSecret = 'CLIENT_SECRET';

  // Add one or more SPACE separated scopes
  oauth2.scope = 'account_read account_update contact_data campaign_data';

  // Begin the OAuth2 three-legged 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;
  }

  print(url);

  // Launch the system's default browser navigated to the URL.
  try {
    oauth2.launchBrowser(url);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // Now wait for the authorization.
  // We'll wait for a max of 30 seconds.
  var numMsWaited = 0;
  while ((numMsWaited < 30000) && (oauth2.authFlowState < 3)) {
    oauth2.sleepMs(100);
    numMsWaited += 100;
  }

  // If there was no response from the browser within 30 seconds, then 
  // the AuthFlowState will be equal to 1 or 2.
  // 1: Waiting for Redirect. The OAuth2 background thread is waiting to receive the redirect HTTP request from the browser.
  // 2: Waiting for Final Response. The OAuth2 background thread is waiting for the final access token response.
  // In that case, cancel the background task started in the call to StartAuth.
  if (oauth2.authFlowState < 3) {
    oauth2.cancel();
    print('No response from the browser!');
    return;
  }

  // Check the AuthFlowState to see if authorization was granted, denied, or if some error occurred
  // The possible AuthFlowState values are:
  // 3: Completed with Success. The OAuth2 flow has completed, the background thread exited, and the successful JSON response is available in AccessTokenResponse property.
  // 4: Completed with Access Denied. The OAuth2 flow has completed, the background thread exited, and the error JSON is available in AccessTokenResponse property.
  // 5: Failed Prior to Completion. The OAuth2 flow failed to complete, the background thread exited, and the error information is available in the FailureInfo property.
  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}');

  // Get the full JSON response:
  final json = CkJsonObject();
  json.load(oauth2.accessTokenResponse);
  json.emitCompact = false;

  // The JSON response looks like this:

  // {
  //   "access_token": "aEr4czHReESHUGcc2LRknzsMxUbW",
  //   "refresh_token": "s2qH27ikM7r3Ia0LrZGDOIgKw0bubUotBdJ7fTtc7y",
  //   "token_type": "Bearer"
  // }

  print(json.emit());

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