/library/Zend/Service/Amazon/Authentication/V2.php

  1<?php
  2/**
  3 * Zend Framework
  4 *
  5 * LICENSE
  6 *
  7 * This source file is subject to the new BSD license that is bundled
  8 * with this package in the file LICENSE.txt.
  9 * It is also available through the world-wide-web at this URL:
 10 * http://framework.zend.com/license/new-bsd
 11 * If you did not receive a copy of the license and are unable to
 12 * obtain it through the world-wide-web, please send an email
 13 * to license@zend.com so we can send you a copy immediately.
 14 *
 15 * @category   Zend
 16 * @package    Zend_Service_Amazon
 17 * @subpackage Authentication
 18 * @copyright  Copyright (c) 2005-2012 Zend Technologies USA Inc. (http://www.zend.com)
 19 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 20 */
 21
 22/**
 23 * @see Zend_Service_Amazon_Authentication
 24 */
 25require_once 'Zend/Service/Amazon/Authentication.php';
 26
 27/**
 28 * @see Zend_Crypt_Hmac
 29 */
 30require_once 'Zend/Crypt/Hmac.php';
 31
 32/**
 33 * @category   Zend
 34 * @package    Zend_Service_Amazon
 35 * @subpackage Authentication
 36 * @copyright  Copyright (c) 2005-2012 Zend Technologies USA Inc. (http://www.zend.com)
 37 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 38 */
 39class Zend_Service_Amazon_Authentication_V2 extends Zend_Service_Amazon_Authentication
 40{
 41    /**
 42     * Signature Version
 43     */
 44    protected $_signatureVersion = '2';
 45
 46    /**
 47     * Signature Encoding Method
 48     */
 49    protected $_signatureMethod = 'HmacSHA256';
 50
 51    /**
 52     * Type of http request
 53     * @var string
 54     */
 55    protected $_httpMethod = "POST";
 56
 57    /**
 58     * Generate the required attributes for the signature
 59     * @param string $url
 60     * @param array $parameters
 61     * @return string
 62     */
 63    public function generateSignature($url, array &$parameters)
 64    {
 65        $parameters['AWSAccessKeyId']   = $this->_accessKey;
 66        $parameters['SignatureVersion'] = $this->_signatureVersion;
 67        $parameters['Version']          = $this->_apiVersion;
 68        $parameters['SignatureMethod']  = $this->_signatureMethod;
 69        if(!isset($parameters['Timestamp'])) {
 70            $parameters['Timestamp']    = gmdate('Y-m-d\TH:i:s\Z', time()+10);
 71        }
 72
 73        $data = $this->_signParameters($url, $parameters);
 74
 75        return $data;
 76    }
 77
 78    /**
 79     * Set http request type to POST or GET
 80     * @param string $method
 81     */
 82    public function setHttpMethod($method = "POST") {
 83        $this->_httpMethod = strtoupper($method);
 84    }
 85
 86    /**
 87     * Get the current http request type
 88     * @return string
 89     */
 90    public function getHttpMethod()
 91    {
 92        return $this->_httpMethod;
 93    }
 94
 95    /**
 96     * Computes the RFC 2104-compliant HMAC signature for request parameters
 97     *
 98     * This implements the Amazon Web Services signature, as per the following
 99     * specification:
100     *
101     * 1. Sort all request parameters (including <tt>SignatureVersion</tt> and
102     *    excluding <tt>Signature</tt>, the value of which is being created),
103     *    ignoring case.
104     *
105     * 2. Iterate over the sorted list and append the parameter name (in its
106     *    original case) and then its value. Do not URL-encode the parameter
107     *    values before constructing this string. Do not use any separator
108     *    characters when appending strings.
109     *
110     * @param  string $queue_url  Queue URL
111     * @param  array  $parameters the parameters for which to get the signature.
112     *
113     * @return string the signed data.
114     */
115    protected function _signParameters($url, array &$paramaters)
116    {
117        $data = $this->_httpMethod . "\n";
118        $data .= parse_url($url, PHP_URL_HOST) . "\n";
119        $data .= ('' == $path = parse_url($url, PHP_URL_PATH)) ? '/' : $path;
120        $data .= "\n";
121
122        uksort($paramaters, 'strcmp');
123        unset($paramaters['Signature']);
124
125        $arrData = array();
126        foreach($paramaters as $key => $value) {
127            $arrData[] = $key . '=' . str_replace('%7E', '~', rawurlencode($value));
128        }
129
130        $data .= implode('&', $arrData);
131
132        $hmac = Zend_Crypt_Hmac::compute($this->_secretKey, 'SHA256', $data, Zend_Crypt_Hmac::BINARY);
133
134        $paramaters['Signature'] = base64_encode($hmac);
135
136        return $data;
137    }
138}