php – Amazon Product API返回“SignatureDoesNotMatch”

我想写一个应用程序,通过ISBN获取书籍封面(用于慈善计划).所以我决定使用亚马逊产品API.我有访问密钥和密钥.我得到了一个生成密钥的代码我通过了URL但是返回了那样

<?xml version="1.0"?>
<ItemLookupErrorResponse xmlns="http://ecs.amazonaws.com/doc/2005-10-05/">
<Error><Code>SignatureDoesNotMatch</Code><Message>The request signature we calculated
does not match the signature you provided. 
Check your AWS Secret Access Key and signing method. 
Consult the service documentation for details.     
</Message></Error><RequestID>6c60b8b7-8b78-4f21-bb7c-3d5d3a26dc48</RequestID>
</ItemLookupErrorResponse>

这是代码

<?PHP
$AWSAccessKeyId = "*******ACCESS KEY***************";



    $signature = base64_encode(hash_hmac('sha256',$string_to_sign,"******SECRET KEY*******",true));
    // encode any plus (+), equal (=), or other reserved characters in $signature
    $signature = str_replace('%7E','~',rawurlencode($signature));

    $url = "http://ecs.amazonaws.com/onca/xml?AWSAccessKeyId=".$AWSAccessKeyId."&IdType=ASIN&ItemId=1933988355&Operation=ItemLookup&ResponseGroup=Medium%2COffers&Service=AWSECommerceService&Timestamp=".gmdate('Y-m-d\TH:i:s\Z')."&Signature=".$signature;

echo $url;
?>

代码有什么问题？

更新：

我尝试使用相同的时间戳.仍然没有运气.这是示例代码.

$method = "GET";
$host = "ecs.amazonaws.".$region;
$uri = "/onca/xml";

// additional parameters
$params["Service"] = "AWSECommerceService";
$params["AWSAccessKeyId"] = $public_key;
// GMT timestamp
$params["Timestamp"] = gmdate("Y-m-d\TH:i:s\Z");
// API version
$params["Version"] = "2009-03-31";

// sort the parameters
ksort($params);

// create the canonicalized query
$canonicalized_query = array();
foreach ($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);

// create the string to sign
$string_to_sign = $method."\n".$host."\n".$uri."\n".$canonicalized_query;

// calculate HMAC with SHA256 and base64-encoding
$signature = base64_encode(hash_hmac("sha256", $string_to_sign, $private_key, True));

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

解决方法:

从时间戳创建一个变量,在$string_to_sign和url-parameter中使用它,否则可能会发生两个时间戳不同的情况.要提供更多帮助,您需要显示$string_to_sign的创建.

此外：Timestamp参数也需要进行urlencoded编码.

也许这对你有用：http://mierendo.com/software/aws_signed_query/

php – Amazon Product API返回“SignatureDoesNotMatch”

相关文章