/**
* Makes a signed_request blob using the given data.
*
* @param array $data The data array.
* @param string $appSecret
* @throws InvalidArgumentException
* @return string The signed request.
*/
public static function encode($data, $appSecret)
{
if (!is_array($data)) {
throw new InvalidArgumentException(__METHOD__ . ' expects an array, but given ' . print_r($data, TRUE));
}
$data['algorithm'] = Configuration::SIGNED_REQUEST_ALGORITHM;
$data['issued_at'] = time();
$b64 = Helpers::base64UrlEncode(Json::encode($data));
$raw_sig = hash_hmac('sha256', $b64, $appSecret, $raw = TRUE);
$sig = Helpers::base64UrlEncode($raw_sig);
return $sig . '.' . $b64;
}
