C#多部分表单数据httpclient上传CSV服务 [英] C# multipart form data httpclient upload csv service

问题描述

我有一个Windows服务，该服务正在C#中上传多部分数据表单.它正在上载带有身份验证变量的csv，格式为:密钥，上下文和uuid.变量在自定义令牌类中设置.每次尝试上传时，都会出现403错误.

I have a windows service that is uploading a multipart data form in C#. It is uploading a csv with authentication variables in the form: a key, a context, and a uuid. The variables are set in a custom Token class. Each time I try to upload, I get a 403 error.

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net;
using System.Net.Http;
using System.Net.Http.Headers;
using System.Text;
using System.Threading;
using System.Threading.Tasks;

namespace UploadScheduler.Service
{
    class UploadHttp
    {
        // HttpClient is instantiated once per application
        static readonly HttpClient client = new HttpClient();
        //myUserKey and myUuid are redacted values
        public static string userKey = "myUserKey";
        public static string uuid = "myUuid";

        public static void UploadFile(FileInfo file, Token token, DateTime lwt, DateTime nwt)
        {
            FileInfo fi = new FileInfo(file.FullName);
            string fileName = fi.Name;
            byte[] fileContents = File.ReadAllBytes(fi.FullName);
            Uri webService = new Uri(token.Url);
            HttpRequestMessage requestMessage = new HttpRequestMessage(HttpMethod.Post, webService);
            requestMessage.Headers.ExpectContinue = false;
            HttpWebRequest webRequest = WebRequest.CreateHttp(token.Url);
            webRequest.ServicePoint.Expect100Continue = false;
            MultipartFormDataContent multiPartContent = new MultipartFormDataContent();
            ByteArrayContent byteArrayContent = new ByteArrayContent(fileContents);
            byteArrayContent.Headers.Add("Content-Type", "text/csv");
            multiPartContent.Add(byteArrayContent, "file", fileName);
            multiPartContent.Add(new StringContent(token.Key), "key");
            multiPartContent.Add(new StringContent(token.Context), "context");
            multiPartContent.Add(new StringContent(token.Uuid), "uuid");
            requestMessage.Content = multiPartContent;

            try
            {
                //Task<HttpResponseMessage> httpRequest = client.SendAsync(requestMessage, HttpCompletionOption.ResponseContentRead, CancellationToken.None);
                Task<HttpResponseMessage> httpRequest = client.PostAsync(token.Url, multiPartContent, CancellationToken.None);
                HttpResponseMessage httpResponse = httpRequest.Result;
                HttpStatusCode statusCode = httpResponse.StatusCode;
                HttpContent responseContent = httpResponse.Content;

                if (responseContent != null)
                {
                    Task<String> stringContentsTask = responseContent.ReadAsStringAsync();
                    String stringContents = stringContentsTask.Result;
                    Library.RecordUpload(file, lwt, nwt);
                }
            }
            catch (Exception ex)
            {
                Library.WriteLog("Upload Error: " + file.Name + " " + ex.Message);
                //Library.WriteLog(ex.StackTrace);
            }
        }
    }
}

我正在尝试上传到Amazon S3存储桶，该存储桶是通过第三方处理的.有人告诉我我的请求格式不正确；但是，当我在 http://www.webhook.com 中尝试此操作时，它会成功上传并显示表单输入的值.

I am trying to upload to an Amazon S3 Bucket, and the bucket is handled through a third party. I have been told that my request is malformed; however, when I try this in http://www.webhook.com, it successfully uploads and shows the form values as entered.

我的代码中是否缺少某些内容?还是来自第三方的政策/许可问题?此多部分数据&httpclient对我来说是新手，所以我不会缺少我想要的东西.

Is there something that I am missing in my code? Or is it a policy/permission issue from the third party? This multipartformdata & httpclient is new to me, so I don't what I'm missing, if anything.

原始代码: https://dotnetcodr.com/2013/01/10/how-to-post-a-multipart-http-message-to-a-web-service-in-c-handle-with-java/

AWS S3错误: https://aws.amazon.com/premiumsupport/knowledge-center/s3-403-forbidden-error/

AWS S3 Errors: https://aws.amazon.com/premiumsupport/knowledge-center/s3-403-forbidden-error/

在开发过程中，我确实创建了自己的S3存储桶，并添加了NuGet AWS S3类，该类能够成功上传文件.现在，我正在上传到第3方存储分区，但我一直收到403错误.谢谢！

In my development process, I did create my own S3 bucket and I added the NuGet AWS S3 class, which was able to upload files successfully. Now that I am uploading to a 3rd party bucket, I keep getting a 403 error. Thanks!

推荐答案

我走了使用Postman创建请求的路线，然后使用RestSharp NuGet软件包获得了C#的生成代码.

I went the route of using Postman to create my request, then got the generated code for C# with the RestSharp NuGet Package.

public static void UploadFile(FileInfo file, Token token, DateTime lwt, DateTime nwt)
        {
            string status = "";
            string reason = "";
            try
            {
                var client = new RestClient(token.Url);
                client.Timeout = -1;
                var request = new RestRequest(Method.POST);
                request.AddParameter("key", token.Key);
                request.AddParameter("uuid", token.Uuid);
                request.AddParameter("context", token.Context);
                request.AddFile("file", file.FullName);
                IRestResponse response = client.Execute(request);
                status = response.StatusCode.ToString();
                reason = response.ErrorMessage.ToString();
                Library.RecordUploadSuccess(file, lwt, nwt);
            }
            catch (Exception ex)
            {
                Library.RecordUploadError(file, status, reason);
                //Library.RecordUploadError(file, ex.Message, ex.StackTrace);
            }
        }

强烈建议您采用多份表格数据的方法.

Highly recommend going that route for multipart form-data.

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