使用 Restsharp PCL 上传到 Dropbox

Question

我正在尝试使用 RestSharp.Portable 使用 PCL 将文件上传到 Dropbox。我的代码是

public async Task<object> UploadFile(Stream fileStream, string fileName)
{
    var client = new RestClient("https://api-content.dropbox.com");
    client.ClearEncodings();
    client.AddEncoding("gzip", new GzipEncoding());

    var request = new RestRequest("1/files/dropbox/Apps/FileBolt", HttpMethod.Post);
    request.AddHeader("Authorization", string.Format("Bearer {0}", Token));
    request.AddParameter("file", fileName);

    byte[] bytes = null;
    long numBytes = fileStream.Length;

    using (var br = new BinaryReader(fileStream))
    {
        bytes = br.ReadBytes((int) numBytes);
    }

    request.AddFile(new FileParameter { ContentLength = numBytes, FileName = fileName, Name = "file", Value = bytes });

    var boxItemResponse = await client.Execute<Entities.Cloud.Dropbox.File>(request);
    if (boxItemResponse != null && boxItemResponse.Data != null)
    {
        return boxItemResponse.Data;
    }

    return null;
}

这是实际的 REST 调用

POST https://api-content.dropbox.com/1/files/dropbox/Apps/FileBolt HTTP/1.1
Authorization: Bearer XXXXXXXXXXXXXXXXXXXXXXXX
Accept: application/json, text/json, text/x-json, text/javascript, application/xml, text/xml
Accept-Encoding: gzip
Content-Type: multipart/form-data; boundary="0ab9510a-e347-4871-96c0-14b11b382435"
Host: api-content.dropbox.com
Content-Length: 20205
Expect: 100-continue

--0ab9510a-e347-4871-96c0-14b11b382435
Content-Type: text/plain; charset=utf-8
Content-Disposition: form-data; name=file

driver.png
--0ab9510a-e347-4871-96c0-14b11b382435
Content-Length: 19865
Content-Disposition: form-data; name=file; filename=driver.png; filename*=utf-8''driver.png

{BYTES}
--0ab9510a-e347-4871-96c0-14b11b382435--

以及来自 DropBox 的响应

HTTP/1.1 400 Bad Request
Server: nginx
Date: Sat, 22 Mar 2014 12:16:07 GMT
Content-Type: application/json
Transfer-Encoding: chunked
Connection: keep-alive

2e
{"error": {"file": "Expecting a file upload"}}
0

我还删除了 request.AddParameter("file", fileName); 并从 Dropbox 回复

{"error": "Forbidden"}

我在这里做错了什么？

注意：此实现需要位于 PCL 中，它将在 WP8、Xamarin.Android、Xamarin.IOS、Windows WPF 之间共享。

更新：

虽然我之前尝试过 PUT (files_put) api 调用，但我现在可以通过将路径更改为沙盒而不是保管箱，因为我的应用程序只能访问它自己的文件夹。这是可能对其他人有所帮助的代码。

public async Task<object> UploadFile(Stream fileStream, string fileName, string md5 = null)
{
    var client = new RestClient("https://api-content.dropbox.com");
    client.ClearEncodings();
    client.AddEncoding("gzip", new GzipEncoding());

    var request = new RestRequest(string.Format("1/files_put/sandbox/{0}", fileName), HttpMethod.Put);
    request.AddHeader("Authorization", string.Format("Bearer {0}", Token));

    byte[] bytes = null;
    long numBytes = fileStream.Length;

    using (var br = new BinaryReader(fileStream))
    {
        bytes = br.ReadBytes((int) numBytes);
    }

    var body = new Parameter
    {
        ContentType = new MediaTypeHeaderValue("application/octet-stream"),
        Name = "file",
        Value = bytes,
        Type = ParameterType.RequestBody,
        ValidateOnAdd = false
    };
    request.Parameters.Add(body);

    var response = await client.Execute<Entities.Cloud.Dropbox.File>(request);
    if (response != null && response.Data != null)
    {
        return response.Data;
    }

    return null;
}

这是响应实体

using System;
using Newtonsoft.Json;

namespace Entities.Cloud.Dropbox
{
    public class File
    {
        [JsonProperty(PropertyName = "size")]
        public string FriendlySize { get; set; }

        [JsonProperty(PropertyName = "bytes")]
        public int Size { get; set; }

        [JsonProperty(PropertyName = "path")]
        public string Path { get; set; }

        [JsonProperty(PropertyName = "is_dir")]
        public bool IsDirectory { get; set; }

        [JsonProperty(PropertyName = "is_deleted")]
        public bool IsDeleted { get; set; }

        [JsonProperty(PropertyName = "rev")]
        public string Revision { get; set; }

        [JsonProperty(PropertyName = "hash")]
        public string Hash { get; set; }

        [JsonProperty(PropertyName = "thumb_exists")]
        public bool ThumbnailExists { get; set; }

        [JsonProperty(PropertyName = "icon")]
        public string Icon { get; set; }

        [JsonProperty(PropertyName = "modified")]
        public DateTime Modified { get; set; }

        [JsonProperty(PropertyName = "root")]
        public string Root { get; set; }
    }
}

Answer 1

/files (POST) 不是多部分表单上传。正如文档所说“......整个 POST 正文将被视为文件”。

我会就如何构建正确的 HTTP 请求提供更多建议，但老实说，我什至从未使用过这个端点，我建议你也不要这样做。正如文档所说，“我们建议您使用/files_put，因为它的界面更简单。”我建议使用它并将文件内容添加为请求的正文。