(JavaScript) Get a Google Drive Access Token using a JSON Private Key

Demonstrates how to get a Google Drive API access token using a JSON service account private key.

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

// First load the JSON key into a string.
var fac = new CkFileAccess();
var jsonKey = fac.ReadEntireTextFile("qa_data/googleApi/chilkatcloud-b8826e030499.json","utf-8");
if (fac.LastMethodSuccess !== true) {
    console.log(fac.LastErrorText);
    return;
}

var gAuth = new 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.
var tlsSock = new CkSocket();
success = tlsSock.Connect("www.googleapis.com",443,true,5000);
if (success !== true) {
    console.log(tlsSock.LastErrorText);
    return;
}

// Send the request to obtain the access token.
success = gAuth.ObtainAccessToken(tlsSock);
if (success !== true) {
    console.log(gAuth.LastErrorText);
    return;
}

// Examine the access token:
console.log("Access Token: " + gAuth.AccessToken);