cache token to bypass future auth requests

cache_token.php

use OpenCloud\Rackspace;
 
$client = new Rackspace(Rackspace::US_IDENTITY_ENDPOINT, array(
  'username' => 'foo',
  'apiKey'   => 'bar'
));

$cacheFile = __DIR__ . '/.opencloudToken';

$token = $client->getTokenObject();

if (!$token || ($token && $token->hasExpired())) {
  $client->authenticate();
  $data = array(
    'id'      => $token->getId(), 
    'expires' => $token->getExpires()
  );
  file_put_contents($cacheFile, serialize($data));
}
		
if (file_exists($cacheFile)) {
  $data = unserialize(file_get_contents($cacheFile));
  $client->setToken($data);
}