c# - 亚马逊产品广告 API 签名问题

Question

我正在尝试使用以下发布在亚马逊网络服务示例代码页面中的代码在亚马逊产品数据库中进行搜索

AWSECommerceService ecs = new AWSECommerceService();

// Create ItemSearch wrapper
ItemSearch search = new ItemSearch();
search.AssociateTag = "ABC";
search.AWSAccessKeyId = "XYZ";

// Create a request object
ItemSearchRequest request = new ItemSearchRequest();

// Fill request object with request parameters
request.ResponseGroup = new string[] { "ItemAttributes" };

// Set SearchIndex and Keywords
request.SearchIndex = "All";
request.Keywords = "The Shawshank Redemption";

// Set the request on the search wrapper
search.Request = new ItemSearchRequest[] { request };

try
{
    //Send the request and store the response
    //in response

    ItemSearchResponse response = ecs.ItemSearch(search);
    gvRes.DataSource = response.Items;
}
catch (Exception ex) 
{
    divContent.InnerText = ex.Message;
}

出现以下错误

The request must contain the parameter Signature.

而且亚马逊的文档并不清楚如何签署请求。

知道如何让它工作吗？？？

谢谢

Answer 1

我转录了 this vb 代码，它对我有用

添加服务引用并将其命名为 Amazon

http://webservices.amazon.com/AWSECommerceService/AWSECommerceService.wsdl

进入托管项目的文件夹，打开服务引用文件夹并打开 Reference.cs，然后将出现的所有 [][] 替换为 []，然后打开 AWSECommerceService.wsdl 并找到

<xs:element minOccurs="0" maxOccurs="unbounded" name="ImageSets">

并替换为

<xs:element minOccurs="0" maxOccurs="1" name="ImageSets">

添加如下，需要手动引用一些dll

using System.Security.Cryptography;
using System.ServiceModel;
using System.ServiceModel.Channels;
using System.ServiceModel.Dispatcher;
using System.ServiceModel.Description;
using System.Text.RegularExpressions;
using System.Xml;
using System.IO;
using System.Runtime.Serialization;
using AmazonApiTest.Amazon; //instead of AmazonApiTest use your project name

首先各种接口(interface)实现

public class AmazonSigningMessageInspector : IClientMessageInspector
{
    private string accessKeyId = "";
    private string secretKey = "";

    public AmazonSigningMessageInspector(string accessKeyId, string secretKey)
    {
        this.accessKeyId = accessKeyId;
        this.secretKey = secretKey;
    }

    public Object BeforeSendRequest(ref System.ServiceModel.Channels.Message request, IClientChannel channel) 
    {
        string operation = Regex.Match(request.Headers.Action, "[^/]+$").ToString();
        DateTime now = DateTime.UtcNow;
        String timestamp = now.ToString("yyyy-MM-ddTHH:mm:ssZ");
        String signMe = operation + timestamp;
        Byte[] bytesToSign = Encoding.UTF8.GetBytes(signMe);

        Byte[] secretKeyBytes = Encoding.UTF8.GetBytes(secretKey);
        HMAC hmacSha256 = new HMACSHA256(secretKeyBytes);
        Byte[] hashBytes = hmacSha256.ComputeHash(bytesToSign);
        String signature = Convert.ToBase64String(hashBytes);

        request.Headers.Add(new AmazonHeader("AWSAccessKeyId", accessKeyId));
        request.Headers.Add(new AmazonHeader("Timestamp", timestamp));
        request.Headers.Add(new AmazonHeader("Signature", signature));
        return null;
    }

    void IClientMessageInspector.AfterReceiveReply(ref System.ServiceModel.Channels.Message Message, Object correlationState)
    {
    }
}

public class AmazonSigningEndpointBehavior : IEndpointBehavior
{
    private string accessKeyId = "";
    private string secretKey = "";

    public AmazonSigningEndpointBehavior(string accessKeyId, string secretKey)
    {
        this.accessKeyId = accessKeyId;
        this.secretKey = secretKey;
    }

    public void ApplyClientBehavior(ServiceEndpoint serviceEndpoint, ClientRuntime clientRuntime)
    {
        clientRuntime.ClientMessageInspectors.Add(new AmazonSigningMessageInspector(accessKeyId, secretKey));
    }

    public void ApplyDispatchBehavior(ServiceEndpoint serviceEndpoint, EndpointDispatcher endpointDispatched)
    {
    }

    public void Validate(ServiceEndpoint serviceEndpoint)
    {
    }

    public void AddBindingParameters(ServiceEndpoint serviceEndpoint, BindingParameterCollection bindingParemeters)
    {
    }
}

public class AmazonHeader : MessageHeader
{
    private string m_name;
    private string value;

    public AmazonHeader(string name, string value)
    {
        this.m_name = name;
        this.value = value;
    }

    public override string Name
    {
        get { return m_name; }
    }
    public override string Namespace
    {
        get { return "http://security.amazonaws.com/doc/2007-01-01/"; }
    }
    protected override void OnWriteHeaderContents(System.Xml.XmlDictionaryWriter writer, MessageVersion messageVersion)
    {
        writer.WriteString(value);
    }
}

现在你以这种方式使用生成的代码

ItemSearch search = new ItemSearch();
search.AssociateTag = "YOUR ASSOCIATE TAG";
search.AWSAccessKeyId = "YOUR AWS ACCESS KEY ID";           
ItemSearchRequest req = new ItemSearchRequest();
req.ResponseGroup = new string[] { "ItemAttributes" };
req.SearchIndex = "Books";
req.Author = "Lansdale";
req.Availability = ItemSearchRequestAvailability.Available;
search.Request = new ItemSearchRequest[]{req};

Amazon.AWSECommerceServicePortTypeClient amzwc = new Amazon.AWSECommerceServicePortTypeClient();
amzwc.ChannelFactory.Endpoint.EndpointBehaviors.Add(new AmazonSigningEndpointBehavior("ACCESS KEY", "SECRET KEY"));

ItemSearchResponse resp = amzwc.ItemSearch(search);

foreach (Item item in resp.Items[0].Item)
     Console.WriteLine(item.ItemAttributes.Author[0] + " - " + item.ItemAttributes.Title);