带有F#的Kraken私有API返回EGeneral:无效的参数

时间:2016-04-17 16:48:17

标签: rest f# http-post f#-data

我正在尝试使用F#访问Kraken私有API。访问公共API的代码运行得非常好,但是当我尝试访问私有API时,我总是收到错误" EGeneral:无效的参数"。

#r "FSharp.Data.dll"

open FSharp.Data
open System
open System.Text
open System.Security.Cryptography

let baseUri = "https://api.kraken.com"
let key = MY_KRAKEN_API_KEY
let secret = MY_KRAKEN_API_SECRET
let path = "/0/private/Balance"
let nonce = DateTime.UtcNow.Ticks
let bodyText = "nonce=" + nonce.ToString()

let hmac (key : byte []) (data : byte[]) =
    use hmac = new HMACSHA512(key)
    hmac.ComputeHash(data)

let sha256 (data : string) =
    use sha = SHA256Managed.Create()
    sha.ComputeHash(Encoding.UTF8.GetBytes(data))

let createSignature (nonce : int64) body (path : string) secret =
    let shaSum = nonce.ToString() + body |> sha256
    let data = Array.append (Encoding.UTF8.GetBytes path) shaSum
    let key = Convert.FromBase64String secret
    hmac key data |> Convert.ToBase64String

let signature = createSignature nonce bodyText path secret

let response = Http.RequestString (
    url = baseUri + path,
    httpMethod = "POST",
    headers = ([("API-Key", key); ("API-Sign", signature)] |> Seq.ofList),
    body = TextRequest bodyText
)

有人看到我做错了吗?

编辑: Kraken.com API文档可在此处获取:https://www.kraken.com/help/api

我认为标题签名不正确。该文档要求在标题中提交以下两个值:

  

API-Key = API密钥API-Sign =使用HMAC-SHA512的消息签名   (URI路径+ SHA256(nonce + POST数据))和base64解码的秘密API   键

编辑2: 其余参数需要使用POST方法传输。就我而言,这只是" nonce" HTTP请求的正文部分中的值。

1 个答案:

答案 0 :(得分:4)

我在为Kraken编写C#库时遇到了同样的错误,我发现了这个问题的解决方案:

如果API密钥或标志错误或缺失,则不会出现此错误。问题是您没有为您的请求添加mediatype。我不知道它在F#中是如何工作的,但请看这个例子:

using (var client = new HttpClient())
{
    string address = String.Format("{0}/{1}/public/{2}", _url, _version, method);
    // Does not work with this:
    // var content = new StringContent(postData, Encoding.UTF8);
    var content = new StringContent(postData, Encoding.UTF8, "application/x-www-form-urlencoded");

    var response = await client.PostAsync(address, content);

    return await response.Content.ReadAsStringAsync();
}

" application / x-www-form-urlencoded" 是关键路径。如果您没有发送请求,则会得到" EGeneral:无效参数" -error。有了它,一切正常。至少在我的情况下。