Dart Requires Chilkat v10.1.2+

Slack OAuth2

See more OAuth2 Examples

Slack OAuth2 Dart

import 'package:chilkat/chilkat.dart';

void main() {
  // For more information about the OAuth2, see OAuth 2.0 Authorization Flow

  final oauth2 = CkOAuth2();

  // This example is for desktop applicatons (it is not for code that runs on a web server).

  // Your applicaton must use your own public web server as an intermediate
  // to receive and forward the redirect to localhost.
  // See Using Your Web Server as an Intermediary for OAuth2 Redirect to localhost

  // This is the Redirect URL defined for your Slack App in the Slack developer portal, and contains the above PHP.
  oauth2.appCallbackUrl = 'https://yourwebserver.com/oauth2_redirect';
  oauth2.listenPort = 3017;

  oauth2.authorizationEndpoint = 'https://slack.com/oauth/authorize';
  oauth2.tokenEndpoint = 'https://slack.com/api/oauth.access';

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

  oauth2.scope = 'team:read users:read';

  // 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;
  }

  print('url = $url');

  // 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}');

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

  // The JSON response looks like this:

  // {
  //   "ok": true,
  //   "access_token": "xoxp-348475395242-348621810805-4768936228341-9f512b295124e7c9846ce63cb1464c4d",
  //   "scope": "identify,team:read,users:read",
  //   "user_id": "UA8HZRUPP",
  //   "team_id": "TA3DZBN74",
  //   "enterprise_id": null,
  //   "team_name": "Chilkat Testing"
  // }

  print(json.emit());

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