/**
* The Signature Base String is a consistent reproducible concatenation of the
* request elements into a single string. The string is used as an input in hashing or signing algorithms.
*
* The base string => $http_method&urlencode($Url without query params)&urlencode(normalized_request_parameters)
* (Basically HTTP method(GET/POST etc), the URL(scheme://host/path, doesnt include the query string), and the norlalized request parameters
* each urlencoded and the concated with &.)
*/
private function get_signature_base_string($http_method, $Url, $oAuthOptions)
{
// Get the Query String parameters. Example if the request is http://photos.example.net/photos.aspx?file=vacation.jpg&size=original
// then get the query string and create an array from it in form of key value pairs
// $qsArray Key Value
// file vacation.jpg
// size original
$parts = parse_url($Url);
$qs = $parts['query'];
parse_str($qs, $qsArray);
$signable_options = array_merge($oAuthOptions, $qsArray);
$signable_parameters = RequestSigner::get_normalized_request_parameters($signable_options);
$normalized_url = Util::get_normalized_http_url($Url);
if (AppConfig::$debug) {
print AppConfig::$lineBreak . '[----------START Parts to build base string from ' . $Url . '-----------]' . AppConfig::$lineBreak;
print AppConfig::$lineBreak . 'HTTP Method: ' . $http_method . AppConfig::$lineBreak;
print AppConfig::$lineBreak . 'Normalized Url: ' . $normalized_url . AppConfig::$lineBreak;
print AppConfig::$lineBreak . 'Signable Parameters: ' . $signable_parameters . AppConfig::$lineBreak;
print AppConfig::$lineBreak . 'Query String parameters: ' . $qs . AppConfig::$lineBreak;
print AppConfig::$lineBreak . '[----------END Parts to build base string-----------]' . AppConfig::$lineBreak;
}
$parts = array($http_method, $normalized_url, $signable_parameters);
// Url encode each of http method, Url(without query string), and the normalized parameters (oauth parameters, along with query string parameters)
$parts = Util::urlencode_rfc3986($parts);
// After url encoding, concatenate them with an &
return implode('&', $parts);
}
