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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
  * @subpackage Amazon
  * @copyright  Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
  * @license    http://framework.zend.com/license/new-bsd     New BSD License
  * @version    $Id$
  */
 
 /**
  * @see Zend_Rest_Client
  */
 // require_once 'Zend/Rest/Client.php';
 
 /** @see Zend_Xml_Security */
 // require_once 'Zend/Xml/Security.php';
 
 /**
  * @category   Zend
  * @package    Zend_Service
  * @subpackage Amazon
  * @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
 {
     /**
      * Amazon Web Services Access Key ID
      *
      * @var string
      */
     public $appId;
 
     /**
      * @var string
      */
     protected $_secretKey = null;
 
     /**
      * @var string
      */
     protected $_baseUri = null;
 
     /**
      * List of Amazon Web Service base URLs, indexed by country code
      *
      * @var array
      */
     protected $_baseUriList = array('US' => 'http://webservices.amazon.com',
                                     'UK' => 'http://webservices.amazon.co.uk',
                                     'DE' => 'http://webservices.amazon.de',
                                     'JP' => 'http://webservices.amazon.co.jp',
                                     'FR' => 'http://webservices.amazon.fr',
                                     'CA' => 'http://webservices.amazon.ca');
 
     /**
      * Reference to REST client object
      *
      * @var Zend_Rest_Client
      */
     protected $_rest = null;
 
 
     /**
      * Constructs a new Amazon Web Services Client
      *
      * @param  string $appId       Developer's Amazon appid
      * @param  string $countryCode Country code for Amazon service; may be US, UK, DE, JP, FR, CA
      * @throws Zend_Service_Exception
      * @return Zend_Service_Amazon
      */
     public function __construct($appId, $countryCode = 'US', $secretKey = null)
     {
         $this->appId = (string) $appId;
         $this->_secretKey = $secretKey;
 
         $countryCode = (string) $countryCode;
         if (!isset($this->_baseUriList[$countryCode])) {
             /**
              * @see Zend_Service_Exception
              */
             // require_once 'Zend/Service/Exception.php';
             throw new Zend_Service_Exception("Unknown country code: $countryCode");
         }
 
         $this->_baseUri = $this->_baseUriList[$countryCode];
     }
 
 
     /**
      * Search for Items
      *
      * @param  array $options Options to use for the Search Query
      * @throws Zend_Service_Exception
      * @return Zend_Service_Amazon_ResultSet
      * @see http://www.amazon.com/gp/aws/sdk/main.html/102-9041115-9057709?s=AWSEcommerceService&v=2011-08-01&p=ApiReference/ItemSearchOperation
      */
     public function itemSearch(array $options)
     {
         $client = $this->getRestClient();
         $client->setUri($this->_baseUri);
 
         $defaultOptions = array('ResponseGroup' => 'Small');
         $options = $this->_prepareOptions('ItemSearch', $options, $defaultOptions);
         $client->getHttpClient()->resetParameters();
         $response = $client->restGet('/onca/xml', $options);
 
         if ($response->isError()) {
             /**
              * @see Zend_Service_Exception
              */
             // require_once 'Zend/Service/Exception.php';
             throw new Zend_Service_Exception('An error occurred sending request. Status code: '
                                            . $response->getStatus());
         }
 
         $dom = new DOMDocument();
         $dom = Zend_Xml_Security::scan($response->getBody(), $dom);
         self::_checkErrors($dom);
 
         /**
          * @see Zend_Service_Amazon_ResultSet
          */
         // require_once 'Zend/Service/Amazon/ResultSet.php';
         return new Zend_Service_Amazon_ResultSet($dom);
     }
 
 
     /**
      * Look up item(s) by ASIN
      *
      * @param  string $asin    Amazon ASIN ID
      * @param  array  $options Query Options
      * @see http://www.amazon.com/gp/aws/sdk/main.html/102-9041115-9057709?s=AWSEcommerceService&v=2011-08-01&p=ApiReference/ItemLookupOperation
      * @throws Zend_Service_Exception
      * @return Zend_Service_Amazon_Item|Zend_Service_Amazon_ResultSet
      */
     public function itemLookup($asin, array $options = array())
     {
         $client = $this->getRestClient();
         $client->setUri($this->_baseUri);
         $client->getHttpClient()->resetParameters();
 
         $defaultOptions = array('ResponseGroup' => 'Small');
         $options['ItemId'] = (string) $asin;
         $options = $this->_prepareOptions('ItemLookup', $options, $defaultOptions);
         $response = $client->restGet('/onca/xml', $options);
 
         if ($response->isError()) {
             /**
              * @see Zend_Service_Exception
              */
             // require_once 'Zend/Service/Exception.php';
             throw new Zend_Service_Exception(
                 'An error occurred sending request. Status code: ' . $response->getStatus()
             );
         }
 
         $dom = new DOMDocument();
         $dom = Zend_Xml_Security::scan($response->getBody(), $dom);
         self::_checkErrors($dom);
         $xpath = new DOMXPath($dom);
         $xpath->registerNamespace('az', 'http://webservices.amazon.com/AWSECommerceService/2011-08-01');
         $items = $xpath->query('//az:Items/az:Item');
 
         if ($items->length == 1) {
             /**
              * @see Zend_Service_Amazon_Item
              */
             // require_once 'Zend/Service/Amazon/Item.php';
             return new Zend_Service_Amazon_Item($items->item(0));
         }
 
         /**
          * @see Zend_Service_Amazon_ResultSet
          */
         // require_once 'Zend/Service/Amazon/ResultSet.php';
         return new Zend_Service_Amazon_ResultSet($dom);
     }
 
 
     /**
      * Returns a reference to the REST client
      *
      * @return Zend_Rest_Client
      */
     public function getRestClient()
     {
         if($this->_rest === null) {
             $this->_rest = new Zend_Rest_Client();
         }
         return $this->_rest;
     }
 
     /**
      * Set REST client
      *
      * @param Zend_Rest_Client
      * @return Zend_Service_Amazon
      */
     public function setRestClient(Zend_Rest_Client $client)
     {
         $this->_rest = $client;
         return $this;
     }
 
 
     /**
      * Prepare options for request
      *
      * @param  string $query          Action to perform
      * @param  array  $options        User supplied options
      * @param  array  $defaultOptions Default options
      * @return array
      */
     protected function _prepareOptions($query, array $options, array $defaultOptions)
     {
         $options['AWSAccessKeyId'] = $this->appId;
         $options['Service']        = 'AWSECommerceService';
         $options['Operation']      = (string) $query;
         $options['Version']        = '2011-08-01';
 
         // de-canonicalize out sort key
         if (isset($options['ResponseGroup'])) {
             $responseGroup = explode(',', $options['ResponseGroup']);
 
             if (!in_array('Request', $responseGroup)) {
                 $responseGroup[] = 'Request';
                 $options['ResponseGroup'] = implode(',', $responseGroup);
             }
         }
 
         $options = array_merge($defaultOptions, $options);
 
         if($this->_secretKey !== null) {
             $options['Timestamp'] = gmdate("Y-m-d\TH:i:s\Z");;
             ksort($options);
             $options['Signature'] = self::computeSignature($this->_baseUri, $this->_secretKey, $options);
         }
 
         return $options;
     }
 
     /**
      * Compute Signature for Authentication with Amazon Product Advertising Webservices
      *
      * @param  string $baseUri
      * @param  string $secretKey
      * @param  array $options
      * @return string
      */
     static public function computeSignature($baseUri, $secretKey, array $options)
     {
         // require_once "Zend/Crypt/Hmac.php";
 
         $signature = self::buildRawSignature($baseUri, $options);
         return base64_encode(
             Zend_Crypt_Hmac::compute($secretKey, 'sha256', $signature, Zend_Crypt_Hmac::BINARY)
         );
     }
 
     /**
      * Build the Raw Signature Text
      *
      * @param  string $baseUri
      * @param  array $options
      * @return string
      */
     static public function buildRawSignature($baseUri, $options)
     {
         ksort($options);
         $params = array();
         foreach($options AS $k => $v) {
             $params[] = $k."=".rawurlencode($v);
         }
 
         return sprintf("GET\n%s\n/onca/xml\n%s",
             str_replace('http://', '', $baseUri),
             implode("&", $params)
         );
     }
 
 
     /**
      * Check result for errors
      *
      * @param  DOMDocument $dom
      * @throws Zend_Service_Exception
      * @return void
      */
     protected static function _checkErrors(DOMDocument $dom)
     {
         $xpath = new DOMXPath($dom);
         $xpath->registerNamespace('az', 'http://webservices.amazon.com/AWSECommerceService/2011-08-01');
 
         if ($xpath->query('//az:Error')->length >= 1) {
             $code = $xpath->query('//az:Error/az:Code/text()')->item(0)->data;
             $message = $xpath->query('//az:Error/az:Message/text()')->item(0)->data;
 
             switch($code) {
                 case 'AWS.ECommerceService.NoExactMatches':
                     break;
                 default:
                     /**
                      * @see Zend_Service_Exception
                      */
                     // require_once 'Zend/Service/Exception.php';
                     throw new Zend_Service_Exception("$message ($code)");
             }
         }
     }
 }