(PHP Extension) 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.

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<?php

// The version number (9_5_0) should match version of the Chilkat extension used, omitting the micro-version number.
// For example, if using Chilkat v9.5.0.48, then include as shown here:
include("chilkat_9_5_0.php");

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

// First load the PKCS12 (.p12 / .pfx) into a PFX object.
$pfx = new CkPfx();
$success = $pfx->LoadPfxFile('qa_data/googleSvcAccountKeys/ChilkatCloud-6ba1b17d6d16.p12','notasecret');
if ($success != true) {
    print $pfx->lastErrorText() . "\n";
    exit;
}

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

// Set the client email address.
$gAuth->put_EmailAddress('pip-563@chilkatcloud.iam.gserviceaccount.com');

// Choose a scope.
$gAuth->put_Scope('https://www.googleapis.com/auth/cloud-platform');

// Request an access token that is valid for this many seconds.
$gAuth->put_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->put_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.
$tlsSock = new CkSocket();
$success = $tlsSock->Connect('www.googleapis.com',443,true,5000);
if ($success != true) {
    print $tlsSock->lastErrorText() . "\n";
    exit;
}

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

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

?>