public function fetchKeys($iss)
{
$url = "{$iss}.well-known/jwks.json";
if (($secret = $this->cache->get($url)) === null) {
$secret = [];
$request = new RequestBuilder(array('domain' => $iss, 'basePath' => '.well-known/jwks.json', 'method' => 'GET', 'guzzleOptions' => $this->guzzleOptions));
$jwks = $request->call();
foreach ($jwks['keys'] as $key) {
$secret[$key['kid']] = $this->convertCertToPem($key['x5c'][0]);
}
$this->cache->set($url, $secret);
}
return $secret;
}
