(JavaScript) Get XOAUTH2 Access Token from Google OAuth 2.0 Authorization Server

Obtains an OAUTH2 access token from the Google OAuth 2.0 Authorization Server. This is for Server to server applications using Google API's that need an access token. See https://developers.google.com/accounts/docs/OAuth2ServiceAccount

Note

This example is intended for running within a Chilkat.Js embedded JavaScript engine. All Chilkat JavaScript examples require Chilkat v11.4.0 or greater.

var success = false;

// This example assumes the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

var http = new CkHttp();

// --------------------------------------------------------------------------------
// 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
// --------------------------------------------------------------------------------
// Begin by loading your Google service account key (.p12)
var cert = new CkCert();
success = cert.LoadPfxFile("c:/someDirectory/keys/chilkat25-cbd7b42afbd8.p12","notasecret");
if (success !== true) {
    console.log(cert.LastErrorText);
    return;
}

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

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

// The sub is your company email address
var oauth_sub = "bob@yourcompany.com";

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

var accessToken = http.G_SvcOauthAccessToken(iss,scope,oauth_sub,numSec,cert);
if (http.LastMethodSuccess !== true) {
    console.log(http.LastErrorText);
    return;
}
else {
    console.log("access token: " + accessToken);
}

// The access token allows us to send unlimited emails while it's valid. Once it expires, we must obtain and use a new one.