如何解决亚马逊产品广告api-项目查找请求工作示例
| 有人会举一个亚马逊ITEMLOOKUP
string ISBN = \"0393326381\";
string ASIN = \"\";
if (!(string.IsNullOrEmpty(ISBN) && string.IsNullOrEmpty(ASIN)))
{
AWSECommerceServicePortTypeChannel service = new AWSECommerceServicePortTypeChannel();
ItemLookup lookup = new ItemLookup();
ItemLookupRequest request = new ItemLookupRequest();
lookup.AssociateTag = secretKey;
lookup.AWSAccessKeyId = accessKeyId;
if (string.IsNullOrEmpty(ASIN))
{
request.IdType = ItemLookupRequestIdType.ISBN;
request.ItemId = new string[] { ISBN.Replace(\"-\",\"\") };
}
else
{
request.IdType = ItemLookupRequestIdType.ASIN;
request.ItemId = new string[] { ASIN };
}
request.ResponseGroup = new string[] { \"OfferSummary\" };
lookup.Request = new ItemLookupRequest[] { request };
response = service.ItemLookup(lookup);
if (response.Items.Length > 0 && response.Items[0].Item.Length > 0)
{
Item item = response.Items[0].Item[0];
if (item.MediumImage == null)
{
//bookImageHyperlink.Visible = false;
}
else
{
//bookImageHyperlink.ImageUrl = item.MediumImage.URL;
}
//bookImageHyperlink.NavigateUrl = item.DetailPageURL;
//bookTitleHyperlink.Text = item.ItemAttributes.Title;
//bookTitleHyperlink.NavigateUrl = item.DetailPageURL;
if (item.OfferSummary.LowestNewPrice == null)
{
if (item.OfferSummary.LowestUsedPrice == null)
{
//priceHyperlink.Visible = false;
}
else
{
//priceHyperlink.Text = string.Format(\"Buy used {0}\",item.OfferSummary.LowestUsedPrice.FormattedPrice);
//priceHyperlink.NavigateUrl = item.DetailPageURL;
}
}
else
{
//priceHyperlink.Text = string.Format(\"Buy new {0}\",item.OfferSummary.LowestNewPrice.FormattedPrice);
//priceHyperlink.NavigateUrl = item.DetailPageURL;
}
if (item.ItemAttributes.Author != null)
{
//authorLabel.Text = string.Format(\"By {0}\",string.Join(\",\",item.ItemAttributes.Author));
}
else
{
//authorLabel.Text = string.Format(\"By {0}\",item.ItemAttributes.Creator.Select(c => c.Value).ToArray()));
}
/*
ItemLink link = item.ItemLinks.Where(i => i.Description.Contains(\"Wishlist\")).FirstOrDefault();
if (link == null)
{
//wishListHyperlink.Visible = false;
}
else
{
//wishListHyperlink.NavigateUrl = link.URL;
}
* */
}
}
}
解决方法
说，这些代码看起来很熟悉。从端点切换到要求您添加消息签名的过程中，您就缺少了端点签名。您需要在客户端上添加行为。这是上面代码的更改：
if (!(string.IsNullOrEmpty(ISBN) && string.IsNullOrEmpty(ASIN)))
{
AWSECommerceServicePortTypeClient client = new AWSECommerceServicePortTypeClient();
client.ChannelFactory.Endpoint.Behaviors.Add(
new Amazon.AmazonSigningEndpointBehavior(
accessKeyId,secretKey);
ItemLookup lookup = new ItemLookup();
ItemLookupRequest request = new ItemLookupRequest();
lookup.AssociateTag = accessKeyId;
lookup.AWSAccessKeyId = secretKey;
//... etc.
namespace Amazon
{
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.MessageInspectors.Add(new AmazonSigningMessageInspector(accessKeyId,secretKey));
}
public void ApplyDispatchBehavior(ServiceEndpoint serviceEndpoint,EndpointDispatcher endpointDispatcher) { return; }
public void Validate(ServiceEndpoint serviceEndpoint) { return; }
public void AddBindingParameters(ServiceEndpoint serviceEndpoint,BindingParameterCollection bindingParameters) { return; }
}
}
namespace Amazon
{
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 Message request,IClientChannel channel) {
// prepare the data to sign
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);
// sign the data
byte[] secretKeyBytes = Encoding.UTF8.GetBytes(secretKey);
HMAC hmacSha256 = new HMACSHA256(secretKeyBytes);
byte[] hashBytes = hmacSha256.ComputeHash(bytesToSign);
string signature = Convert.ToBase64String(hashBytes);
// add the signature information to the request headers
request.Headers.Add(new AmazonHeader(\"AWSAccessKeyId\",accessKeyId));
request.Headers.Add(new AmazonHeader(\"Timestamp\",timestamp));
request.Headers.Add(new AmazonHeader(\"Signature\",signature));
return null;
}
public void AfterReceiveReply(ref Message reply,object correlationState) { }
}
}
namespace Amazon
{
public class AmazonHeader : MessageHeader
{
private string name;
private string value;
public AmazonHeader(string name,string value)
{
this.name = name;
this.value = value;
}
public override string Name { get { return name; } }
public override string Namespace { get { return \"http://security.amazonaws.com/doc/2007-01-01/\"; } }
protected override void OnWriteHeaderContents(XmlDictionaryWriter xmlDictionaryWriter,MessageVersion messageVersion)
{
xmlDictionaryWriter.WriteString(value);
}
}
}
PM> Install-Package Nager.AmazonProductAdvertising
var authentication = new AmazonAuthentication();
authentication.AccessKey = \"accesskey\";
authentication.SecretKey = \"secretkey\";
var wrapper = new AmazonWrapper(authentication,AmazonEndpoint.DE);
var result = wrapper.Lookup(\"0393326381\",AmazonResponseGroup.OfferSummary);
var request = new ItemLookupRequest();
request.ItemId = new[] {upcCode};
request.IdType = ItemLookupRequestIdType.UPC;
request.IdTypeSpecified = true;
request.SearchIndex = \"All\";
var item = client.LookupByAsin(\"B0037X9N5U\");
double? price = item.GetLowestPrice();
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