Dart

Get Google API Access Token using P12 Service Account Key

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Demonstrates how to get a Google API access token using a P12 service account 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.

  // --------------------------------------------------------------------------------
  // For a step-by-step guide for setting up your Google Workspace service account,
  // see Setup Google Workspace Account for Sending SMTP GMail from a Service Account
  // --------------------------------------------------------------------------------

  // First load the PKCS12 (.p12 / .pfx) into a PFX object.
  final pfx = CkPfx();
  try {
    pfx.loadPfxFile('qa_data/pfx/chilkat25-cbd7b42afbd8.p12', 'notasecret');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  final gAuth = CkAuthGoogle();
  gAuth.setP12(pfx);

  // The ISS is your service account email address ending in gserviceaccount.com.
  final iss = 'chilkatsvc@chilkat25.iam.gserviceaccount.com';

  // The scope is always the following string:
  final scope = 'https://mail.google.com/';

  // The sub is your company email address
  final oauthSub = 'info@chilkat.xyz';

  // The access token is valid for this number of seconds.
  final numSec = 3600;

  gAuth.emailAddress = iss;
  gAuth.scope = scope;
  gAuth.expireNumSeconds = numSec;
  gAuth.subEmailAddress = oauthSub;

  // Connect to www.googleapis.com
  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}');
}