亚马逊产品查询签名不匹配

时间:2019-01-24 20:20:37

标签: api request amazon signature

这是我得到的响应:我们计算出的请求签名与您提供的签名不匹配。

这是我用来生成签名的代码:

static byte[] HmacSHA256(String data, byte[] key)
{
    String algorithm = "HmacSHA256";
    KeyedHashAlgorithm kha = KeyedHashAlgorithm.Create(algorithm);
    kha.Key = key;

    return kha.ComputeHash(Encoding.UTF8.GetBytes(data));
}

static byte[] getSignatureKey(String key, String dateStamp, String regionName, String serviceName)
{
    byte[] kSecret = Encoding.UTF8.GetBytes(("AWS4" + key).ToCharArray());
    byte[] kDate = HmacSHA256(dateStamp, kSecret);
    byte[] kRegion = HmacSHA256(regionName, kDate);
    byte[] kService = HmacSHA256(serviceName, kRegion);
    byte[] kSigning = HmacSHA256("aws4_request", kService);

    return kSigning;
}

使用Amazon的测试设置时,我会获得正确的签名

key = 'wJalrXUtnFEMI/K7MDENG+bPxRfiCYEXAMPLEKEY'
dateStamp = '20120215'
regionName = 'us-east-1'
serviceName = 'iam'

但是,当我输入实时设置时,会出现不匹配的错误。

这是我用来获取我的签名的东西:

var reqSig = getSignatureKey("[my secret key]", dateStamp, "us-west-2","AWSECommerceService");

这就是我要提交的内容(目前,我只是在浏览器中对其进行测试):

ecs.amazonaws.com/onca/xml?Service=AWSECommerceService&AWSAccessKeyId=[my
access key that corresponds with the secret
key]&Operation=ItemLookup&IdType=UPC&ItemId=635753490879&Timestamp=2019-01-24T19:14:55.2644840Z&Signature=32BA07ECE67F3177BF2EA02923E624D612A45FAA144ED0E43BDDC0DF6574EAC3

我不确定这是否与该地区有关(在我的情况下为us-west-2),因为请求该地区没有地方。我不确定如果我无法指定它是哪个区域并且我已经使用该区域来计算签名,那么Amazon可以如何针对我的参数测试我的签名。

我想念什么?

1 个答案:

答案 0 :(得分:0)

好的。花了几天时间后,这就是我要做的事情:

/*

    DOCUMENTATION: https://docs.aws.amazon.com/AWSECommerceService/latest/DG/rest-signature.html#rest_detailedexample
*/

    var itemID = "0679722769";
    var accessKeyID = "AKIAIOSFODNN7EXAMPLE";
    var timeStamp = DateTime.UtcNow.ToString("o");
    var req = $"Service=AWSECommerceService&AWSAccessKeyId={accessKeyID}&Operation=ItemLookup&IdType=UPC&ItemId={itemID}&Version=2013-08-01&Timestamp={timeStamp}";
    req = req.Replace(":", "%3A").Replace(",", "%2C"); //UrlDecode certain characters
    var reqlist = req.Split('&').ToArray(); //we need to sort our key/value pairs
    Array.Sort(reqlist);
    req = String.Join("&", reqlist); //join everything back
    var reqToSign = $@"GET
webservices.amazon.com
/onca/xml
{req}".Replace("\r", ""); //create the request for signing. We need to replace microsofts's crlf with just a lf; Make sure there are no leading spaces after the linefeeds.

    var signage = getSignatureKey("1234567890",reqToSign);
    req = $"http://webservices.amazon.com/onca/xml?{req}&Signature={signage}"; //create our request with the signature appended.
    return req;
}

private static byte[] HmacSHA256(String data, byte[] key)
{
    String algorithm = "HmacSHA256";
    KeyedHashAlgorithm kha = KeyedHashAlgorithm.Create(algorithm);
    kha.Key = key;

    return kha.ComputeHash(Encoding.UTF8.GetBytes(data));
}


private static string getSignatureKey(string key, string stringToSign)
{
    byte[] kSecret = Encoding.UTF8.GetBytes(key.ToCharArray());
    byte[] kSigning = HmacSHA256(stringToSign, kSecret);
    return WebUtility.UrlEncode(Convert.ToBase64String(kSigning));
}

与在此和其他地方找到的大多数答案相反,这是唯一有效的方法。必须对整个请求进行哈希处理,而不仅仅是特定的参数。我无法与其他Amazon服务通话,但是Commerce Service必须像这样完成。

相当多的答案引用了以下内容:https://docs.aws.amazon.com/general/latest/gr/sigv4-calculate-signature.html或以下内容:Amazon API generating a request signature in C# .NET

正如我在问题中所述,这当然是不正确的。如果您没有传递region参数,那么Amazon如何创建相同的签名,因为它没有所有信息。

无论如何,这现在可行。