private FormUrlEncodedContent CreateHttpContent(IKrakenRequest requestData, long nonce, string uriPath)
{
var pathBytes = Encoding.UTF8.GetBytes($"/0/private/{uriPath}");
var props = "nonce=" + nonce + string.Join("", requestData.FormData.Select(x => $"&{x.Key}={x.Value}"));
var np = nonce + Convert.ToChar(0) + props;
var hash = Sha256(np);
var z = new byte[pathBytes.Length + hash.Length];
pathBytes.CopyTo(z, 0);
hash.CopyTo(z, pathBytes.Length);
var signature = HmacSha512(Convert.FromBase64String(apiPrivateKey), z);
var sigString = Convert.ToBase64String(signature);
var data = new List <KeyValuePair <string, string> >();
data.Add(new KeyValuePair <string, string>("nonce", nonce.ToString()));
data.AddRange(requestData.FormData);
var content = new FormUrlEncodedContent(data);
content.Headers.Add(ApiKeyHeader, new [] { apiKey });
content.Headers.Add(ApiSignHeader, new [] { sigString });
return(content);
}
private async Task <T> MakePostRequestAsync <T>(string url, IKrakenRequest request, TranslatedSignalTableEntity translatedSignal, CancellationToken cancellationToken)
{
try
{
var now = DateTime.UtcNow;
if ((now - lastRequestTime).TotalSeconds <= 2)
{
await Task.Delay(TimeSpan.FromSeconds(2), cancellationToken);
}
lastRequestTime = DateTime.UtcNow;
var content = CreateHttpContent(request, nonceProvider.GetNonce(), url);
var response = await apiClient.MakePostRequestAsync <ResponseBase <T> >($"{endpointUrl}/{url}", content,
translatedSignal.RequestSent, translatedSignal.ResponseReceived, cancellationToken);
if (response.Error.Any())
{
if (response.Error.Any(x => x == "EOrder:Insufficient funds"))
{
throw new InsufficientFundsException();
}
else
{
throw new ApiException(string.Join("; ", response.Error));
}
}
return(response.Result);
}
catch (Exception e)
{
translatedSignal?.Failure(e);
throw;
}
}
