Dart

Get a Google Drive Access Token using a JSON Private Key

See more Google Drive Examples

Demonstrates how to get a Google Drive API access token using a JSON service account private 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/googleApi/chilkatcloud-b8826e030499.json', 'utf-8');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

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

  // Choose a scope.
  gAuth.scope = 'https://www.googleapis.com/auth/drive';

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

  // If the application is requesting delegated access:
  // The email address of the user for which the application is requesting delegated access,
  // then set the email address here. (Otherwise leave it empty.)
  gAuth.subEmailAddress = '';

  // Connect to www.googleapis.com using TLS (TLS 1.2 is the default.)
  // The Chilkat socket object is used so that the connection can be established
  // through proxies or an SSH tunnel if desired.
  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}');
}