php - 亚马逊产品广告API在php中无效的xml响应

Question

我正在使用 codeigniter 开发 Web 应用程序。过去 7 个月前，我使用此代码并从亚马逊获取产品，但上个月我没有使用此代码获得任何产品。我还联系了脚本作者，他还没有任何回应。任何人都可以告诉我问题出在哪里。有没有人有使用亚马逊产品广告 API 的代码。

aws_signed_request.php

function  aws_signed_request($region,$params,$public_key,$private_key,$associate_tag)
{

    $method = "GET";
    $host = "ecs.amazonaws.".$region; // must be in small case
    $uri = "/onca/xml";


    $params["Service"]          = "AWSECommerceService";
    $params["AWSAccessKeyId"]   = $public_key;
    $params["AssociateTag"]     = $associate_tag;
    $params["Timestamp"]        = gmdate("Y-m-d\TH:i:s\Z");
    $params["Version"]          = "2009-03-31";

    /* The params need to be sorted by the key, as Amazon does this at
      their end and then generates the hash of the same. If the params
      are not in order then the generated hash will be different thus
      failing the authetication process.
    */
    ksort($params);

    $canonicalized_query = array();

    foreach ($params as $param=>$value)
    {
        $param = str_replace("%7E", "~", rawurlencode($param));
        $value = str_replace("%7E", "~", rawurlencode($value));
        $canonicalized_query[] = $param."=".$value;
    }

    $canonicalized_query = implode("&", $canonicalized_query);

    $string_to_sign = $method."\n".$host."\n".$uri."\n".$canonicalized_query;

    /* calculate the signature using HMAC with SHA256 and base64-encoding.
       The 'hash_hmac' function is only available from PHP 5 >= 5.1.2.
    */
    $signature = base64_encode(hash_hmac("sha256", $string_to_sign, $private_key, True));

    /* encode the signature for the request */
    $signature = str_replace("%7E", "~", rawurlencode($signature));

    /* create request */
    $request = "http://".$host.$uri."?".$canonicalized_query."&Signature=".$signature;

    /* I prefer using CURL */
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL,$request);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($ch, CURLOPT_TIMEOUT, 15);
    curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);

    $xml_response = curl_exec($ch);

    /* If cURL doesn't work for you, then use the 'file_get_contents'
       function as given below.
    */

    if ($xml_response === False)
    {
        return False;
    }
    else
    {
        /* parse XML */
        $parsed_xml = @simplexml_load_string($xml_response);
        return ($parsed_xml === False) ? False : $parsed_xml;
    }
}

amazon_api_class.php

require_once 'aws_signed_request.php';

    class AmazonProductAPI
    {
        /**
         * Your Amazon Access Key Id
         * @access private
         * @var string
         */
        private $public_key     = "AKIAJF7UYAI77UYKXXXX";

        /**
         * Your Amazon Secret Access Key
         * @access private
         * @var string
         */
        private $private_key    = "ISEZ/SgZ9MV7OzTo5KRnkdhjotvp5tPCWnYLXXXX";

        /**
         * Your Amazon Associate Tag
         * Now required, effective from 25th Oct. 2011
         * @access private
         * @var string
         */
        private $associate_tag  = "uytuyerxpo1-20";

        /**
         * Constants for product types
         * @access public
         * @var string
         */

        /*
            Only three categories are listed here. 
            More categories can be found here:
            http://docs.amazonwebservices.com/AWSECommerceService/latest/DG/APPNDX_SearchIndexValues.html
        */
        const MUSIC = "Music";
        const DVD   = "DVD";
        const GAMES = "VideoGames";


        /**
         * Check if the xml received from Amazon is valid
         * 
         * @param mixed $response xml response to check
         * @return bool false if the xml is invalid
         * @return mixed the xml response if it is valid
         * @return exception if we could not connect to Amazon
         */
        private function verifyXmlResponse($response)
        {
            if ($response === False)
            {
                throw new Exception("Could not connect to Amazon");
            }
            else
            {
                if (isset($response->Items->Item->ItemAttributes->Title))
                {
                    return ($response);
                }
                else
                {
                    throw new Exception("Invalid xml response.");
                }
            }
        }


        /**
         * Query Amazon with the issued parameters
         * 
         * @param array $parameters parameters to query around
         * @return simpleXmlObject xml query response
         */
        private function queryAmazon($parameters)
        {
            return aws_signed_request("com", $parameters, $this->public_key, $this->private_key, $this->associate_tag);
        }


        /**
         * Return details of products searched by various types
         * 
         * @param string $search search term
         * @param string $category search category         
         * @param string $searchType type of search
         * @return mixed simpleXML object
         */
        public function searchProducts($search, $category, $searchType = "UPC")
        {
            $allowedTypes = array("UPC", "TITLE", "ARTIST", "KEYWORD");
            $allowedCategories = array("Music", "DVD", "VideoGames");

            switch($searchType) 
            {
                case "UPC" :    $parameters = array("Operation"     => "ItemLookup",
                                                    "ItemId"        => $search,
                                                    "SearchIndex"   => $category,
                                                    "IdType"        => "UPC",
                                                    "ResponseGroup" => "Medium");
                                break;

                case "TITLE" :  $parameters = array("Operation"     => "ItemSearch",
                                                    "Title"         => $search,
                                                    "SearchIndex"   => $category,
                                                    "ResponseGroup" => "Medium");
                                break;

            }

            $xml_response = $this->queryAmazon($parameters);

            return $this->verifyXmlResponse($xml_response);

        }


        /**
         * Return details of a product searched by UPC
         * 
         * @param int $upc_code UPC code of the product to search
         * @param string $product_type type of the product
         * @return mixed simpleXML object
         */
        public function getItemByUpc($upc_code, $product_type)
        {
            $parameters = array("Operation"     => "ItemLookup",
                                "ItemId"        => $upc_code,
                                "SearchIndex"   => $product_type,
                                "IdType"        => "UPC",
                                "ResponseGroup" => "Medium");

            $xml_response = $this->queryAmazon($parameters);

            return $this->verifyXmlResponse($xml_response);

        }


        /**
         * Return details of a product searched by ASIN
         * 
         * @param int $asin_code ASIN code of the product to search
         * @return mixed simpleXML object
         */
        public function getItemByAsin($asin_code)
        {
            $parameters = array("Operation"     => "ItemLookup",
                                "ItemId"        => $asin_code,
                                "ResponseGroup" => "Medium");

            $xml_response = $this->queryAmazon($parameters);

            return $this->verifyXmlResponse($xml_response);
        }


        /**
         * Return details of a product searched by keyword
         * 
         * @param string $keyword keyword to search
         * @param string $product_type type of the product
         * @return mixed simpleXML object
         */
        public function getItemByKeyword($keyword, $product_type)
        {
            $parameters = array("Operation"   => "ItemSearch",
                                "Keywords"    => $keyword,
                                "SearchIndex" => $product_type);

            $xml_response = $this->queryAmazon($parameters);

            return $this->verifyXmlResponse($xml_response);
        }

    }

?>

索引.php

 include("amazon_api_class.php");

    $obj = new AmazonProductAPI();

    try
    {
        $result = $obj->getItemByAsin("B018L25LPC");
    }
    catch(Exception $e)
    {
        echo $e->getMessage();
    }

    var_dump($result);

标签： phpxmlamazon-web-servicesamazon-s3