using System;

using Jose;

using System.Collections.Generic;

using System.Text;

​

public class Program

{

    public static readonly DateTime UnixEpoch = new DateTime(1970, 1, 1, 0, 0, 0, 0, DateTimeKind.Utc);

    public static void Main()

    {

        var now = DateTime.UtcNow;

        var secretClear = "47289671-e13c-4c95-990a-f63f79c0def7";

        var encodedSecret = GetSecretKeyAsBytes(secretClear);

        string token = Jose.JWT.Encode(GetPayload(now), encodedSecret, JwsAlgorithm.HS256);

        Console.WriteLine("nbf = " + GetNbf(now));

        Console.WriteLine("token = " + token);

    }

​

    private static Dictionary<string, object> GetPayload(DateTime utcNow)

    {

        //var user = "corp\\lee.western";

        var payload = new Dictionary<string, object>()

        {

            {

                "iat",

                GetNbf(utcNow)

            }

        };

        return payload;

    }

​

    private static byte[] GetSecretKeyAsBytes(string secret)

    {

        return Encoding.UTF8.GetBytes(secret);

    }

​

    public static string SecretAsBase64Encoded(string secret)

    {

        return Convert.ToBase64String(GetSecretKeyAsBytes(secret));

    }

​

    private static long GetNbf(DateTime utcNow)

    {

        return GetEpochDateTimeAsInt(utcNow); /* nbf */

    }

​

    private static long GetExp(DateTime utcNow)

    {

        var tokenValidFor = TimeSpan.FromDays(200);

        var expiry = utcNow.Add(tokenValidFor);

        return GetEpochDateTimeAsInt(expiry); // exp    

    }

​

    public static long GetEpochDateTimeAsInt(DateTime datetime)

    {

        DateTime dateTime = datetime;

        if (datetime.Kind != DateTimeKind.Utc)

            dateTime = datetime.ToUniversalTime();

        if (dateTime.ToUniversalTime() <= UnixEpoch)

            return 0;

        return (long)(dateTime - UnixEpoch).TotalSeconds;

    }

}