/**
* OAuth 协议的签名
*
* @param string $url
* @param string $method
* @param array $params
* @return string
*/
private function sign($url, $method, $params)
{
uksort($params, 'strcmp');
$pairs = array();
foreach ($params as $key => $value) {
$key = OpenSDK_Util::urlencode_rfc3986($key);
if (is_array($value)) {
// If two or more parameters share the same name, they are sorted by their value
// Ref: Spec: 9.1.1 (1)
natsort($value);
foreach ($value as $duplicate_value) {
$pairs[] = $key . '=' . OpenSDK_Util::urlencode_rfc3986($duplicate_value);
}
} else {
$pairs[] = $key . '=' . OpenSDK_Util::urlencode_rfc3986($value);
}
}
$sign_parts = OpenSDK_Util::urlencode_rfc3986(implode('&', $pairs));
$base_string = implode('&', array(strtoupper($method), OpenSDK_Util::urlencode_rfc3986($url), $sign_parts));
$key_parts = array(OpenSDK_Util::urlencode_rfc3986($this->_app_secret), OpenSDK_Util::urlencode_rfc3986($this->_token_secret));
$key = implode('&', $key_parts);
$sign = base64_encode(OpenSDK_Util::hash_hmac('sha1', $base_string, $key, true));
if ($this->_debug) {
echo 'base_string: ', $base_string, "\n";
echo 'sign key: ', $key, "\n";
echo 'sign: ', $sign, "\n";
}
return $sign;
}
