Dart Requires Chilkat v10.1.3+

Datev OAuth2 Access Token

See more Datev Examples

Demonstrates how to get a Datev OAuth2 access token from a desktop application or script. Dart

import 'package:chilkat/chilkat.dart';

void main() {
  // To further clarify, see OAuth 2.0 Authorization Flow

  final oauth2 = CkOAuth2();

  // Your Datev app should use "http://localhost" (no trailing forward slash) for the redirect URL.
  oauth2.listenPort = 3017;

  // 

  oauth2.authorizationEndpoint = 'https://login.datev.de/openidsandbox/authorize';
  oauth2.tokenEndpoint = 'https://sandbox-api.datev.de/token';

  // Replace this with your actual client ID.
  oauth2.clientId = 'DATEV_CLIENT_ID';
  oauth2.clientSecret = 'DATEV_CLIENT_SECRET';

  oauth2.codeChallenge = true;
  oauth2.codeChallengeMethod = 'S256';

  oauth2.scope = 'openid profile email datev:accounting:clients accounting:documents datev:accounting:extf-files-import';

  // 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 interactive user to grant permission in the interactive browser session.
  // We'll wait for a max of 90 seconds.
  var numMsWaited = 0;
  while ((numMsWaited < 90000) && (oauth2.authFlowState < 3)) {
    oauth2.sleepMs(100);
    numMsWaited += 100;
  }

  // If there was no response from the browser within 90 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;
  }

  // Save the full JSON access token response to a file.
  final sbJson = CkStringBuilder();
  sbJson.append(oauth2.accessTokenResponse);
  sbJson.writeFile('qa_data/tokens/datev.json', 'utf-8', false);

  // The saved JSON response looks like this:

  // {
  // 	"refresh_token": "ZDA5Y .... FFhTXc9",
  // 	"refresh_token_expires_in": 39600,
  // 	"id_token": "eyJ .... Q9w",
  // 	"access_token": "MTM .... 1UDA9",
  // 	"token_type": "bearer",
  // 	"expires_in": 900		
  // }

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