Node.js

OAuth2 for a GMail using a P12 Service Account Key

See more GMail REST API Examples

Demonstrates how to use GMail with OAuth2 for a service account within a Google Workspace Account where your email domain is custom (e.g., @yourcompany.com).

Note: This example does not work for Personal Google Accounts where the email domain is @gmail.com

Node.js

NODEJS_PRELUDE

function chilkatExample() {

    var success = false;

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

    var http = new chilkat.Http();

    //  --------------------------------------------------------------------------------
    //  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 chilkat.Cert();
    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.

    //  -----------------------------------------------------------------------
    var mailman = new chilkat.MailMan();

    //  Set the properties for the GMail SMTP server:
    mailman.SmtpHost = "smtp.gmail.com";
    mailman.SmtpPort = 587;
    mailman.StartTLS = true;

    mailman.SmtpUsername = "bob@yourcompany.com";
    mailman.OAuth2AccessToken = accessToken;

    //  Create a new email object
    var email = new chilkat.Email();

    email.Subject = "This is a test";
    email.Body = "This is a test";
    email.From = "Bob <bob@yourcompany.com>";
    success = email.AddTo("Recipient","recipient@example.com");
    //  To add more recipients, call AddTo, AddCC, or AddBcc once per recipient.

    success = mailman.SendEmail(email);
    if (success !== true) {
        console.log(mailman.LastErrorText);
        return;
    }

    success = mailman.CloseSmtpConnection();
    if (success !== true) {
        console.log("Connection to SMTP server not closed cleanly.");
    }

    console.log("Successfully sent email using Gmail with a service account key.");

}

chilkatExample();