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 <?php
 /**
  * Zend Framework
  *
  * LICENSE
  *
  * This source file is subject to the new BSD license that is bundled
  * with this package in the file LICENSE.txt.
  * It is also available through the world-wide-web at this URL:
  * http://framework.zend.com/license/new-bsd
  * If you did not receive a copy of the license and are unable to
  * obtain it through the world-wide-web, please send an email
  * to license@zend.com so we can send you a copy immediately.
  *
  * @category   Zend
  * @package    Zend_Service_Amazon
  * @subpackage Authentication
  * @copyright  Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
  * @license    http://framework.zend.com/license/new-bsd     New BSD License
  */
 
 /**
  * @see Zend_Service_Amazon_Authentication
  */
 // require_once 'Zend/Service/Amazon/Authentication.php';
 
 /**
  * @see Zend_Crypt_Hmac
  */
 // require_once 'Zend/Crypt/Hmac.php';
 
 /**
  * @category   Zend
  * @package    Zend_Service_Amazon
  * @subpackage Authentication
  * @copyright  Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
  * @license    http://framework.zend.com/license/new-bsd     New BSD License
  */
 class Zend_Service_Amazon_Authentication_V2 extends Zend_Service_Amazon_Authentication
 {
     /**
      * Signature Version
      */
     protected $_signatureVersion = '2';
 
     /**
      * Signature Encoding Method
      */
     protected $_signatureMethod = 'HmacSHA256';
 
     /**
      * Type of http request
      * @var string
      */
     protected $_httpMethod = "POST";
 
     /**
      * Generate the required attributes for the signature
      * @param string $url
      * @param array $parameters
      * @return string
      */
     public function generateSignature($url, array &$parameters)
     {
         $parameters['AWSAccessKeyId']   = $this->_accessKey;
         $parameters['SignatureVersion'] = $this->_signatureVersion;
         $parameters['Version']          = $this->_apiVersion;
         $parameters['SignatureMethod']  = $this->_signatureMethod;
         if(!isset($parameters['Timestamp'])) {
             $parameters['Timestamp']    = gmdate('Y-m-d\TH:i:s\Z', time()+10);
         }
 
         $data = $this->_signParameters($url, $parameters);
 
         return $data;
     }
 
     /**
      * Set http request type to POST or GET
      * @param string $method
      */
     public function setHttpMethod($method = "POST") {
         $this->_httpMethod = strtoupper($method);
     }
 
     /**
      * Get the current http request type
      * @return string
      */
     public function getHttpMethod()
     {
         return $this->_httpMethod;
     }
 
     /**
      * Computes the RFC 2104-compliant HMAC signature for request parameters
      *
      * This implements the Amazon Web Services signature, as per the following
      * specification:
      *
      * 1. Sort all request parameters (including <tt>SignatureVersion</tt> and
      *    excluding <tt>Signature</tt>, the value of which is being created),
      *    ignoring case.
      *
      * 2. Iterate over the sorted list and append the parameter name (in its
      *    original case) and then its value. Do not URL-encode the parameter
      *    values before constructing this string. Do not use any separator
      *    characters when appending strings.
      *
      * @param  string $queue_url  Queue URL
      * @param  array  $parameters the parameters for which to get the signature.
      *
      * @return string the signed data.
      */
     protected function _signParameters($url, array &$paramaters)
     {
         $data = $this->_httpMethod . "\n";
         $data .= parse_url($url, PHP_URL_HOST) . "\n";
         $data .= ('' == $path = parse_url($url, PHP_URL_PATH)) ? '/' : $path;
         $data .= "\n";
 
         uksort($paramaters, 'strcmp');
         unset($paramaters['Signature']);
 
         $arrData = array();
         foreach($paramaters as $key => $value) {
             $arrData[] = $key . '=' . str_replace('%7E', '~', rawurlencode($value));
         }
 
         $data .= implode('&', $arrData);
 
         $hmac = Zend_Crypt_Hmac::compute($this->_secretKey, 'SHA256', $data, Zend_Crypt_Hmac::BINARY);
 
         $paramaters['Signature'] = base64_encode($hmac);
 
         return $data;
     }
 }