/**
* createSignature
* oauth 1.0a refference #9
*
* parameters
* url -- connection url
* method -- 'GET', 'POST' or 'DELETE'
* params -- request parameters oauth and post-field
*
* return
* response of request
*/
protected function createSignature($url, $method, $params)
{
/* normalize */
ksort($params);
$query = EDAssist::params2Query($params);
/* collect key and base string */
$key = $this->consumer_secret . '&' . $this->oauth_token_secret;
$base_string = $method . '&' . rawurlencode($url) . '&' . rawurlencode($query);
$signature = rawurlencode(base64_encode(hash_hmac(EDAssist::$hash_algo, $base_string, $key, true)));
return $signature;
}
