/**
* Generate a base string for a RSA-SHA1 signature
* based on the given a url, method, and any parameters.
*
* @param Url $url
* @param string $method
* @param array $parameters
*
* @return string
*/
protected function baseString(Url $url, $method = 'POST', array $parameters = [])
{
$baseString = rawurlencode($method) . '&';
$schemeHostPath = Url::buildUrl(['scheme' => $url->getScheme(), 'host' => $url->getHost(), 'port' => $url->getPort(), 'path' => $url->getPath()]);
$baseString .= rawurlencode($schemeHostPath) . '&';
$data = [];
parse_str($url->getQuery(), $query);
foreach (array_merge($query, $parameters) as $key => $value) {
$data[rawurlencode($key)] = rawurlencode($value);
}
ksort($data);
array_walk($data, function (&$value, $key) {
$value = $key . '=' . $value;
});
$baseString .= rawurlencode(implode('&', $data));
return $baseString;
}
