using System;

public class Program

{

    public static void Main()

    {

        ParseEncodedToken("vnoEqgAAAA1ldTEubG9yaW90LmlvsXM3cACDSpbi9-pi8RbHZQ==",1);

​

    }

    static void ParseEncodedToken(string Base64UrlEncodedString, int appId)

    {

        string Base64String = CleanBase64(Base64UrlEncodedString);

        byte[] data = System.Convert.FromBase64String(Base64String);

        string HexString = BitConverter.ToString(data).Replace("-", string.Empty);

        Console.WriteLine(HexString + "\n");

        string AppId = HexString.Substring(0,8);

        string ServerIdLengthHex = HexString.Substring(8,8);

        int ServerIdLength = (int)Convert.ToInt64(ServerIdLengthHex,16);

        string ServerUrl = Hex2String(HexString.Substring(16,ServerIdLength*2));

        string Token = HexString.Substring(16+ServerIdLength*2);

        Console.WriteLine("AppId: " + AppId + "\n");

        Console.WriteLine("ServerIdLengthHex: " + ServerIdLengthHex + "\n");

        Console.WriteLine("ServerIdLength: " + ServerIdLength + "\n");

        Console.WriteLine("ServerUrl: " + ServerUrl + "\n");

        Console.WriteLine("Token: " + Token + "\n");

    }

    static string CleanBase64(string Base64Url)

    {

            Base64Url = Base64Url.Replace("-","+");

            Base64Url = Base64Url.Replace("_","\\");

            return Base64Url;

    }

    public static string Hex2String(string hex)

    {

        string result = "";

        int count = hex.Length / 2;

        int s;

​

        for (s = 0; s < count; s++)

        {

            string zeichen = hex.Substring(s * 2, 2);

            result += (char)Convert.ToUInt16(zeichen, 16);

        }

        return result;

    }

}