public function signUrl($url)
{
$urlParts = parse_url($url);
$pathAndQuery = $urlParts['path'] . (empty($urlParts['query']) ? "" : "?" . $urlParts['query']);
$signature = base64_encode(hash_hmac("sha1", APIClient::encodeURI($pathAndQuery), $this->privateKey, true));
if (substr($signature, -1) == '=') {
$signature = substr($signature, 0, -1);
}
$url = $url . (empty($urlParts['query']) ? '?' : '&') . 'signature=' . APIClient::encodeURIComponent($signature);
return $url;
}
