ChatkitGenerateTokenHelperUtility.cs

// Install-Package jose-rt

using System;
using System.Text;
using System.Collections.Generic;
using Jose;

public class Program
{
	public static void Main()
	{
		Console.WriteLine("Hello World");
		var token = GenerateToken("Charlie", "+uhKzPz1I0dYnoToAhkj+DCR51exCybpJ8MlI6LjdQI=", "072d42ca-bcc6-4b19-bfe3-926a1e7d04db", "2a5bc257-0f82-4dd1-83fc-9ab039186a13");
		Console.WriteLine(token);
	}
	
	public static long ToTimestamp(DateTime time)
	{
		var timeSpan = (time - new DateTime(1970, 1, 1, 0, 0, 0));
		return (long)timeSpan.TotalSeconds;
	}
	
	private static string GenerateToken(string userId, string secretKey, string instance, string publicKey) {

		var exp  = ToTimestamp(DateTime.UtcNow.AddMinutes(120));
		var iat = ToTimestamp(DateTime.UtcNow);
		
		var payload = new Dictionary<string, object>()
		{
			{ "sub", userId },
			{ "exp", exp },
			{ "iat", iat },
			{ "instance", instance },
			{ "su", true },
			{ "iss", "api_keys/" + publicKey }
		};
		// 
		byte[] encodedKey = Encoding.ASCII.GetBytes(secretKey);
		return Jose.JWT.Encode(payload, encodedKey, JwsAlgorithm.HS256);
	}
}