Dart Requires Chilkat v11.5.0+

Box: Authorize a User with OAuth 2.0

See more Box Examples

Interactive local-development example using a browser and a loopback callback. Register exactly http://localhost:3017/ in the Box User app. Run this in a trusted environment that can hold the client secret. A deployed web app must handle its registered HTTPS callback on the server.

See the Box API guide for setup and the complete workflow.

Dart

import 'package:chilkat/chilkat.dart';

void main() {
  // Requires Chilkat 11.5.0 or later and a previously unlocked Chilkat bundle.
  // See Global Unlock Sample.
  // Guide: Box API Guide.

  final oauth2 = CkOAuth2();
  oauth2.listenPort = 3017;
  oauth2.authorizationEndpoint = 'https://account.box.com/api/oauth2/authorize';
  oauth2.tokenEndpoint = 'https://api.box.com/oauth2/token';
  oauth2.clientId = 'BOX_CLIENT_ID';
  oauth2.clientSecret = 'BOX_CLIENT_SECRET';
  // Use Box's documented confidential-client authorization-code flow.
  oauth2.codeChallenge = false;
  final String url;
  try {
    url = oauth2.startAuth();
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  try {
    oauth2.launchBrowser(url);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  var elapsedMs = 0;
  while ((elapsedMs < 120000) && (oauth2.authFlowState < 3)) {
    oauth2.sleepMs(100);
    elapsedMs += 100;
  }

  if (oauth2.authFlowState < 3) {
    oauth2.cancel();
    print('Authorization timed out.');
    return;
  }

  if (oauth2.authFlowState != 3) {
    print('Authorization was denied or failed. State: ${oauth2.authFlowState}');
    return;
  }

  // Retain both tokens in your application's protected token store.
  // The variables below are deliberately not printed.
  final accessToken = oauth2.accessToken;
  final refreshToken = oauth2.refreshToken;
  // For this local-development example only, save in a directory restricted to this user.
  // Create qa_data/tokens before running; never put this file under a web root.
  final tokens = CkJsonObject();
  try {
    tokens.load(oauth2.accessTokenResponse);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  try {
    tokens.writeFile('qa_data/tokens/box_oauth.json');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  print('Authorization complete; token response saved in the protected local token file.');
}