using System;       

using System.Text;          

using System.Net;

using System.Globalization;

using System.Security.Cryptography;

​

public class Program

{

    public static void Main()

    {

        //Console.WriteLine(getSignature("vcbifeflj2q6hjf4uaj2eepk6dr3drbpm1ems3bs","2DGLUS2Q0BM18O728B5M"));

        try

            {

                string PATH = "/v1/ping";

                string response = doRequest("GET", PATH);

                Console.WriteLine(response);

            }

            catch (Exception ex)

            {

                throw ex;

            }

    }

    private static string doRequest(string httpMethod, string path, string contentType = null)

        {

            string contentMD5 = null;

            string responseText = null;

            DateTime requestDate = DateTime.UtcNow;            

            string authenticationUrl = "https://api.ninjarmm.com" + path;

            string stringToSign = getStringToSign(httpMethod, contentMD5, contentType, requestDate, path);

            Console.WriteLine("stringToSign : " + stringToSign);

            string signature = getSignature("vcbifeflj2q6hjf4uaj2eepk6dr3drbpm1ems3bs", stringToSign);

            Console.WriteLine("signature : " + signature);

            string authorizationHeaderValue = "NJ " + "2DGLUS2Q0BM18O728B5M" + ":" + signature;

            Console.WriteLine("authorizationHeaderValue : " + authorizationHeaderValue);

            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(authenticationUrl);

            request.Method = httpMethod;

            request.ContentType = contentType;

            request.Headers.Add("Authorization", authorizationHeaderValue);

            request.Headers.Add("x-nj-date", RFC1123_DATE_TIME_FORMATTER(requestDate));

            request.ProtocolVersion = HttpVersion.Version11;

            HttpWebResponse response = (HttpWebResponse)request.GetResponse();

​

            using (var reader = new System.IO.StreamReader(response.GetResponseStream()))

            {

                responseText = reader.ReadToEnd();

            }

​

            return responseText;

        }

    private static string RFC1123_DATE_TIME_FORMATTER(DateTime requestDate)

        {

            var usCulture = new CultureInfo("en-US");

            var str = requestDate.ToString("ddd, dd MMM yyyy HH:mm:ss \'GMT\'", usCulture);

            return str;

        }

    private static String getStringToSign(String httpMethod, String contentMD5, String contentType, DateTime requestDate, String canonicalPath)

        {

            StringBuilder stringBuilder = new StringBuilder();

            stringBuilder.Append((httpMethod + "\n"));

            stringBuilder.Append((contentMD5 != null ? contentMD5 + "\n" : "\n"));

            stringBuilder.Append((contentType != null ? contentType + "\n" : "\n"));

            stringBuilder.Append(RFC1123_DATE_TIME_FORMATTER(requestDate) + "\n");

            stringBuilder.Append(canonicalPath);

​

            return stringBuilder.ToString();

        }

     private static  String getSignature(String secretAccessKey, String stringToSign)

        {

            var enc = Encoding.UTF8;

​

            var stringToSignBytes = System.Text.Encoding.UTF8.GetBytes(stringToSign);

            string encodedString = System.Convert.ToBase64String(stringToSignBytes).Replace("\n", "").Replace("\r", "");

​

            HMACSHA1 hmac = new HMACSHA1(enc.GetBytes(secretAccessKey));

            hmac.Initialize();

​

            byte[] hmacBytes = hmac.ComputeHash(enc.GetBytes(encodedString));

​

            var signature = System.Convert.ToBase64String(hmacBytes).Replace("\n", "");

​

            return signature;

        }

}