Dart

Google Drive Refresh Access Token

See more Google Drive Examples

Demonstrates how to automatically refresh the access token when it expires. 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.

  // This example uses a previously obtained access token having permission for the 
  // Google Drive scope.

  // The access token (and refresh token) was previously saved to a JSON file with this format:
  // See Get Google Drive OAuth2 Access Token

  // {
  //   "access_token": "ya29.Gls-BsdxTWuenChv ... yzVIrXikkLxu5T6dy4I6GjADFardoz4Lruw",
  //   "expires_in": 3600,
  //   "refresh_token": "1/tMBJ ... 27D-Hk6rpQYBA",
  //   "scope": "https://www.googleapis.com/auth/drive",
  //   "token_type": "Bearer"
  // }

  final json = CkJsonObject();
  final tokenFilePath = 'qa_data/tokens/googleDrive.json';
  json.loadFile(tokenFilePath);

  final oauth2 = CkOAuth2();
  oauth2.accessToken = json.stringOf('access_token');
  oauth2.refreshToken = json.stringOf('refresh_token');

  oauth2.authorizationEndpoint = 'https://accounts.google.com/o/oauth2/v2/auth';
  oauth2.tokenEndpoint = 'https://www.googleapis.com/oauth2/v4/token';

  //  Replace these with actual values.
  oauth2.clientId = 'GOOGLE-CLIENT-ID';
  oauth2.clientSecret = 'GOOGLE-CLIENT-SECRET';
  oauth2.scope = 'https://www.googleapis.com/auth/drive';

  // Use OAuth2 to refresh the access token.
  try {
    oauth2.refreshAccessToken();
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  print(oauth2.accessTokenResponse);

  // Save the new access token to our JSON file (so we can refresh it again when needed).
  json.updateString('access_token', oauth2.accessToken);

  final fac = CkFileAccess();
  fac.writeEntireTextFile(tokenFilePath, json.emit(), 'utf-8', false);

  print('Access Token Refreshed!');
}