C# Amazon SP API CreateFeedDocument 不起作用

问题描述

通过 Amazon SP API 上传 Feed 有 3 个步骤，第一个是通过 createFeedDocument API 获取 Feed 加密信息。但我收到 Bad Request 作为响应，内容如下：

{
  "errors": [
    {
      "code": "InvalidInput","message": "Invalid Input","details": ""
    }
  ]
}

C# 代码

        private async Task<IRestResponse> CreateFeedDocument()
        {
            IRestRequest restRequest = new RestRequest("Feeds/2020-09-04/documents",Method.POST);
            restRequest.AddParameter("contentType","application/xml; charset=UTF-8",ParameterType.RequestBody);
            restRequest.AddQueryParameter("MarketplaceIds","A21TJRUUN4KGV");
            restClient = new RestClient(live_url_base);
            restRequest = await signRequest(restRequest,restClient);
            return restClient.Execute(restRequest);
        }

        private async Task<IRestRequest> signRequest(IRestRequest restRequest,RestClient restClient)
        {
            var roleAcccess = await GetAssumeRoletokenDetail();
            restRequest.AddHeader("x-amz-access-token",accesstoken);

            AWSAuthenticationCredentials AWSCredentials = new AWSAuthenticationCredentials();
            AWSCredentials.AccessKeyId = roleAcccess.Credentials.AccessKeyId;
            AWSCredentials.SecretKey = roleAcccess.Credentials.SecretAccessKey;
            AWSCredentials.Region = region;

            restRequest.AddHeader("X-Amz-Security-Token",roleAcccess.Credentials.SessionToken);
            return new AWSsigv4Signer(AWSCredentials).Sign(restRequest,restClient.BaseUrl.Host);
        }

我怀疑我没有正确使用 restRequest.AddParameter，但我不确定。

我一直在关注以下链接：
https://github.com/amzn/selling-partner-api-docs/blob/main/references/feeds-api/feeds_2020-09-04.md#createfeeddocument

https://github.com/amzn/selling-partner-api-docs/blob/main/guides/en-US/use-case-guides/feeds-api-use-case-guide/feeds-api-use-case-guide-2020-09-04.md#step-1-create-a-feed-document

How to Encrypt and upload data using selling-partner-api in Amzon using .net

更新 我也尝试替换下面的行
restRequest.AddParameter("contentType",ParameterType.RequestBody);
与
restRequest.AddJsonBody(new { contentType = "text/xml; charset=UTF-8" });

但后来我收到了 InvalidSignature 错误，如下所示：

{
  "errors": [
    {
      "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.

The Canonical String for this request should have been
'POST
/Feeds/2020-09-04/documents

host:sellingpartnerapi-eu.amazon.com
x-amz-access-token:Atza|IwEBIA5KgrCsBbSXHmrXFS_figBTInh_xPAydLfi5q2P9xaFQf7p8Zl4NjqhHHxqRzUku__Q7GN1p2WQGRzuAoAa8oMkPLx57NJ05SqxEVXXG-fet3_XgKj8uBCU30HaGPsKltf4g2MD8Pqqt2OUrOXtkv4dAAjjCIxC-bFwVqOhvHktAur--NBv-bJaPZ608Av1GEu96GsNEV9eb0saVBwLaZD7NW3oOjzlCc8GPV9hdqHV5TUXY77QZgBLD1y94Vs1fSo54ShpyoMMOZebzbSr1K5gtf3wJZ.........................{ I hid it }...........................................
x-amz-date:20210524T175148Z
x-amz-security-token:FwoGZXIvYXdzEGsaDNUytY0xuP5/u61APiK2ARMZgv4IT+y2HLzdg5FjZOv6aL2bJ3baJPxBtCY2/7ASntTXfAF5s39P3/qspLLQfmqHPZiMGjweCE3Yf3aW5Q1mt+FLT2s2VUwuOawOQwDll51T2HB3wqyaDOSEpsWeR2Iym4TJXE2hbo7q5CQQBXissOo1Oruk5gcAp7uQHpnyuhCRCkfv/ErEpzdDA0JqfhMxdzmViVgsL1Kzalnbcy9lp+ACI4TL70iOl6j6xkyhFexe/aLXKLLPr4UGMi3Ver2CL6Q4kz.........................{ I hid it }...........................................

host;x-amz-access-token;x-amz-date;x-amz-security-token
4d719849acd655844ab5129f5e54a0ed16954c9580c7a9a737504faf42b309e2'

The String-to-Sign should have been
'AWS4-HMAC-SHA256
20210524T175148Z
20210524/eu-west-1/execute-api/aws4_request
a20e7ffe252dbf98d6a4b9213511ac1918f8bbad75ccbfd7ec46f5c9c1457b08'
","code": "InvalidSignature"
    }
  ]
}

注意：我删除了一些尾随的令牌字符并放置了......{我隐藏了它}.......

解决方法

试试这个

restRequest.AddJsonBody("{\"contentType\":\"text/tab-separated-values; charset=UTF-8\"}");

RestClient restClient = new RestClient("https://sandbox.sellingpartnerapi-eu.amazon.com/");

IRestRequest restRequest = new RestRequest("/feeds/2021-06-30/documents",Method.POST);

restRequest.AddJsonBody("{\"contentType\":\"text/tab-separated-values; charset=UTF-8\"}");