Dart

Get Access Token for Google Tasks using Service Account JSON Key

See more Google Tasks Examples

Demonstrates how to get an access token for the Google Tasks API using a Service Account JSON key. 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.

  // First load the JSON key into a string.
  final fac = CkFileAccess();
  final String jsonKey;
  try {
    jsonKey = fac.readEntireTextFile('qa_data/googleSvcAccountKeys/ChilkatCloud-48f7737c7505.json', 'utf-8');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // A JSON private key should look like this:

  // {
  //   "type": "service_account",
  //   "project_id": "chilkatcloud",
  //   "private_key_id": "48f7737c7505bb88eee6a20d09993e10605d466e",
  //   "private_key": "-----BEGIN PRIVATE KEY----- ... -----END PRIVATE KEY-----\n",
  //   "client_email": "pip-564@chilkatcloud.iam.gserviceaccount.com",
  //   "client_id": "109982228323456925225",
  //   "auth_uri": "https://accounts.google.com/o/oauth2/auth",
  //   "token_uri": "https://oauth2.googleapis.com/token",
  //   "auth_provider_x509_cert_url": "https://www.googleapis.com/oauth2/v1/certs",
  //   "client_x509_cert_url": "https://www.googleapis.com/robot/v1/metadata/x509/pip-564%40chilkatcloud.iam.gserviceaccount.com"
  // }

  final gAuth = CkAuthGoogle();
  gAuth.jsonKey = jsonKey;

  // Choose the scope for read/write access.
  gAuth.scope = 'https://www.googleapis.com/auth/tasks';

  // Request an access token that is valid for this many seconds.
  gAuth.expireNumSeconds = 3600;

  gAuth.subEmailAddress = '';

  // Connect to www.googleapis.com using TLS
  final tlsSock = CkSocket();
  try {
    tlsSock.connect('www.googleapis.com', 443, true, 5000);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // Send the request to obtain the access token.
  try {
    gAuth.obtainAccessToken(tlsSock);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // Examine the access token:
  print('Access Token: ${gAuth.accessToken}');

  // Save our access token to a file.
  fac.writeEntireTextFile('qa_data/tokens/googleTasks.txt', gAuth.accessToken, 'utf-8', false);
}