嗨，我是一个初级程序员，试图将API集成到我的移动应用程序中，这样我就可以从我的应用程序中查看亚马逊的项目。我遵循了这里所有的6个简单步骤，但示例不适合我，如下所示。
以下是我的amazon PHP代码:aws_signed_request.php
<?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
<?php
require_once 'aws_signed_request.php';
class AmazonProductAPI
{
/**
* Your Amazon Access Key Id
* @access private
* @var string
*/
private $public_key = "AKIAJETPMOLIUXXXXXXX";
/**
* Your Amazon Secret Access Key
* @access private
* @var string
*/
private $private_key = "eHpNEaUwsf+HXXXXXXXXXXQGg7Ic2w+K5Gb6rYa";
/**
* Your Amazon Associate Tag
* Now required, effective from 25th Oct. 2011
* @access private
* @var string
*/
private $associate_tag = "mpXXXX-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);
}
}
?>
Example.php
<?php
/* Example usage of the Amazon Product Advertising API */
include("amazon_api_class.php");
$obj = new AmazonProductAPI();
try
{
$result = $obj->searchProducts("X-Men Origins",
AmazonProductAPI::DVD,
"TITLE");
}
catch(Exception $e)
{
echo $e->getMessage();
}
print_r($result);
echo "Sales Rank : {$result->Items->Item->SalesRank}<br>";
echo "ASIN : {$result->Items->Item->ASIN}<br>";
echo "<br><img src='"" . $result->Items->Item->MediumImage->URL . "'" /><br>";
?>
同样，这是运行Example.php的结果。print_r($result);的结果是invalid xml respnse
对于我的情况，我的错误是InvalidClientTokenId, The X.509 certificate or AWS access key ID provided does not exist in our records.，我只是(非常小心地)用这个指南创建了一个新的访问和密钥，并参考这个指南来确认我的关联ID。
要找到您的错误，只需取消throw new Exception("Invalid xml response.");行并添加return ($response);并运行php页面。参考本页的错误列表