The next generation of the Teknik Services. Written in ASP.NET. https://www.teknik.io/
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using Newtonsoft.Json;
using Newtonsoft.Json.Linq;
using System;
using System.IO;
using System.Net;
using System.Text;
namespace Teknik.Utilities
{
public static class CurrencyHelper
{
private static decimal m_CurrentBTCPrice = 0;
private static DateTime m_LastBTCQuery = DateTime.MinValue;
private static TimeSpan m_MaxBTCQueryTime = new TimeSpan(1, 0, 0); // Max query of every hour
/// <summary>
/// Gets the exchange rate for a given currency relative to USD
/// </summary>
/// <param name="target"></param>
/// <returns></returns>
public static decimal GetExchangeRate(CurrencyType target)
{
decimal exchangeRate = 1;
switch (target)
{
case CurrencyType.USD:
exchangeRate = 1;
break;
case CurrencyType.BTC:
// get BTC usd price
exchangeRate = GetBTCPrice();
break;
}
return exchangeRate;
}
public static decimal GetBTCPrice()
{
DateTime curTime = DateTime.Now;
if (curTime - m_LastBTCQuery > m_MaxBTCQueryTime)
{
m_LastBTCQuery = curTime;
string url = "http://api.bitcoincharts.com/v1/weighted_prices.json";
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
try
{
WebResponse response = request.GetResponse();
using (Stream responseStream = response.GetResponseStream())
{
StreamReader reader = new StreamReader(responseStream, Encoding.UTF8);
string jsonResult = reader.ReadToEnd();
JObject result = JsonConvert.DeserializeObject<JObject>(jsonResult);
if (result["USD"] != null)
{
string priceStr = result["USD"]["24h"].ToString();
decimal.TryParse(priceStr, out m_CurrentBTCPrice);
}
}
}
catch (WebException ex)
{
WebResponse errorResponse = ex.Response;
using (Stream responseStream = errorResponse.GetResponseStream())
{
StreamReader reader = new StreamReader(responseStream, Encoding.GetEncoding("utf-8"));
String errorText = reader.ReadToEnd();
}
}
}
return m_CurrentBTCPrice;
}
}
}