(Perl) Get Google API Access Token using P12 Service Account Key

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

Chilkat Perl Downloads Perl Module for Windows, MacOS, Linux, Alpine Linux

use chilkat();

# 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.
$pfx = chilkat::CkPfx->new();
$success = $pfx->LoadPfxFile("qa_data/pfx/chilkat25-cbd7b42afbd8.p12","notasecret");
if ($success != 1) {
    print $pfx->lastErrorText() . "\r\n";
    exit;
}

$gAuth = chilkat::CkAuthGoogle->new();
$success = $gAuth->SetP12($pfx);

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

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

# The sub is your company email address
$oauth_sub = 'info@chilkat.xyz';

# The access token is valid for this number of seconds.
$numSec = 3600;

$gAuth->put_EmailAddress($iss);
$gAuth->put_Scope($scope);
$gAuth->put_ExpireNumSeconds($numSec);
$gAuth->put_SubEmailAddress($oauth_sub);

# Connect to www.googleapis.com
$tlsSock = chilkat::CkSocket->new();
$success = $tlsSock->Connect("www.googleapis.com",443,1,5000);
if ($success != 1) {
    print $tlsSock->lastErrorText() . "\r\n";
    exit;
}

# Send the request to obtain the access token.
$success = $gAuth->ObtainAccessToken($tlsSock);
if ($success != 1) {
    print $gAuth->lastErrorText() . "\r\n";
    exit;
}

# Examine the access token:
print "Access Token: " . $gAuth->accessToken() . "\r\n";