(PHP ActiveX) 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 ActiveX Downloads ActiveX for 32-bit and 64-bit Windows Note: The php_com_dotnet.dll may need to be enabled inside of php.ini.

<?php

// 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 = new COM("Chilkat.Pfx");
$success = $pfx->LoadPfxFile('qa_data/pfx/chilkat25-cbd7b42afbd8.p12','notasecret');
if ($success != 1) {
    print $pfx->LastErrorText . "\n";
    exit;
}

$gAuth = new COM("Chilkat.AuthGoogle");
$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->EmailAddress = $iss;
$gAuth->Scope = $scope;
$gAuth->ExpireNumSeconds = $numSec;
$gAuth->SubEmailAddress = $oauth_sub;

// Connect to www.googleapis.com
$tlsSock = new COM("Chilkat.Socket");
$success = $tlsSock->Connect('www.googleapis.com',443,1,5000);
if ($success != 1) {
    print $tlsSock->LastErrorText . "\n";
    exit;
}

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

// Examine the access token:
print 'Access Token: ' . $gAuth->AccessToken . "\n";

?>