亚马逊产品会员REST API集成

Question

我正在尝试与亚马逊产品会员REST API集成，我拒绝使用SOAP集成，并且请不要在此提出肥皂，我想使用REST，我正在使用最新API版本，这是2013年8月1日我跟随的文档，不知何故，我总是回来一个403禁止的错误，我看遍了各地，我看到的唯一的事情是，对过时的样品在亚马逊，所以我感到沮丧，没有得到我的集成工作，这是我使用的规格。

VS 2015年 控制台应用程序针对.NET 4.5.2 亚马逊API版本2013年8月1日

，这里是我的代码库。

我有一个称为AmazonRestService 类，其具有所需的ItemLookup所有属性，

在构造

我设置一些特性，这是默认为每一个请求，那么我有一个称为SignAmazonRequest 方法，该方法需要一个AmazonRestService作为参数，和我确认有一个值的所有领域，我填满，将需要签名的字符串，

public class AmazonRestService 
 
    { 
 
     public string Url { get; set; } 
 
     public string Operation { get; set; } 
 
     public string AWSAccessKeyId { get; set; } 
 
     public string SecretKey { get; set; } 
 
     public string AssociateTag { get; set; } 
 
     public string ItemId { get; set; } 
 
     public string IdType { get; set; } 
 
     public string[] ResponseGroup { get; set; } 
 
     public string Timestamp { get; set; } 
 
     public string Signature { get; set; } 
 
     public string Version { get; set; } 
 

 
     public AmazonRestService() 
 
     { 
 
      Url = "http://webservices.amazon.com/onca/xml?Service=AWSECommerceService&"; 
 
      AWSAccessKeyId = "XXXXXXXXXXXXXXXXXXXXX"; 
 
      AssociateTag = "xxxx-xx"; 
 
      SecretKey = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"; 
 
      Timestamp = DateTime.UtcNow.ToString("yyyy-MM-ddTHH:mm:ssZ"); 
 
      Version = "2013-08-01"; 
 
     } 
 

 
     public AmazonRestService SignAmazonRequest(AmazonRestService service) 
 
     { 
 
      var stringToSign = ""; 
 
      stringToSign = stringToSign + "AssociateTag=" + service.AssociateTag; 
 
      if (!string.IsNullOrEmpty(service.Operation)) 
 
      { 
 
       stringToSign = stringToSign + "&Operation=" + service.Operation; 
 
      } 
 
      if (!string.IsNullOrEmpty(service.ItemId)) 
 
      { 
 
       stringToSign = stringToSign + "&ItemId=" + service.ItemId; 
 
      } 
 
      if (!string.IsNullOrEmpty(service.IdType)) 
 
      { 
 
       stringToSign = stringToSign + "&IdType=" + service.IdType; 
 
      } 
 
      if (service.ResponseGroup.Length > 0) 
 
      { 
 
       stringToSign = stringToSign + "&ResponseGroup="; 
 

 
       var lastResponse = service.ResponseGroup.Last(); 
 

 
       foreach (var response in service.ResponseGroup) 
 
       { 
 
        stringToSign = stringToSign + response; 
 
        if (response != lastResponse) 
 
        { 
 
         stringToSign = stringToSign + ","; 
 
        } 
 
       } 
 
      } 
 

 
      stringToSign = stringToSign + "&Version=" + service.Version; 
 
      stringToSign = stringToSign + "&AWSAccessKeyId=" + service.AWSAccessKeyId + "&Timestamp=" + service.Timestamp; 
 
      stringToSign = stringToSign.Replace(",", "%2C"); 
 
      stringToSign = stringToSign.Replace(":", "%3A"); 
 
      service.Url = service.Url + stringToSign; 
 
      stringToSign = stringToSign + "&Service=AWSECommerceService"; 
 
      service.Signature = HmacSha256.SignAmazonRequest(service.SecretKey, stringToSign);   
 
      service.Url = service.Url + "&Signature=" + service.Signature; 
 
      return service; 
 

 
     } 
 

 
    }

一旦字符串是准备要签名，我请了一个名为HmacSha256.SignAmazonRequest 在那里我通过我的秘密密钥和字符串将签署不同类的静态mehod，

public static class HmacSha256 
 
    { 
 
     public static string SignAmazonRequest(string secretKey, string request) 
 
     { 
 
      var stringToSign = PrepareSignatureEncryption(request); 
 
      var bytesToSign = Encoding.UTF8.GetBytes(stringToSign); 
 
      var secretKeyBytes = Encoding.UTF8.GetBytes(secretKey); 
 
      var hmacSha256 = new HMACSHA256(secretKeyBytes); 
 
      var hashBytes = hmacSha256.ComputeHash(bytesToSign); 
 

 
      return Convert.ToBase64String(hashBytes).Replace("+", "%2B").Replace("=", "%3D"); 
 
     } 
 

 
     private static string PrepareSignatureEncryption(string request) 
 
     {   
 

 
      var header = "GET" + Environment.NewLine 
 
         + "webservices.amazon.com" + Environment.NewLine 
 
         + "/once/xml" + Environment.NewLine; 
 

 
      var result = header + request; 
 
      return result; 
 
     } 
 
    }

里面的SignAmazonRequest方法，我第一次准备字符串为亚马逊想要它，

我有一个私人帮手方法称为PrepareSignatureEncryption 它需要str将其作为参数进行签名，并返回已准备格式化的字符串，如亚马逊在其文档中所示， 然后将字符串转换为字节， 我将密钥转换为字节， 基于密钥字节生成HMACSHA256， 与我计算的字符串散列签名， 我返回的字节转换为base64字符串，

现在与所有，这是我的代码在静态无效的主要。

class Program 
 
    { 
 
     static void Main(string[] args) 
 
     { 
 
      var restService = new AmazonRestService(); 
 
      restService.Operation = "ItemLookup"; 
 
      restService.IdType = "ASIN"; 
 
      restService.ItemId = "ASINTOLOOKUP"; 
 
      restService.ResponseGroup = new string[] { "BrowseNodes", "Images", "ItemAttributes", "Offers", "Reviews", "SalesRank" }; 
 

 
      var signedRequest = restService.SignAmazonRequest(restService); 
 

 
      Console.WriteLine(signedRequest.Url); 
 
      Console.ReadLine(); 
 

 
      try 
 
      { 
 
       var request = WebRequest.Create(signedRequest.Url); 
 
       var response = request.GetResponse(); 
 
       var doc = new XmlDocument(); 
 
       doc.Load(response.GetResponseStream()); 
 
       doc.Save("C:/data.xml"); 
 

 

 
      } 
 
      catch (Exception ex) 
 
      { 
 

 
       var msg = ex.Message; 
 
      } 
 
     } 
 
    }

我下面这个文档，https://aws.amazon.com/archives/Product-Advertising-API/8967000559514506

任何想法，我走到哪里错了？

Answer 1

亚马逊的文档不好。但是你可以使用这个库Nager。AmazonProductAdvertising可以用nuget和github

PM> Install-Package Nager.AmazonProductAdvertising 

例

var authentication = new AmazonAuthentication(); 
authentication.AccessKey = "accesskey"; 
authentication.SecretKey = "secretkey"; 

var wrapper = new AmazonWrapper(authentication, AmazonEndpoint.US); 
var result = wrapper.Search("canon eos", AmazonSearchIndex.Electronics, AmazonResponseGroup.Large);