using System;

using System.Linq;

using System.Security.Cryptography;

public static class _configurationManager

{

    public static string LLNWMediaVaultBaseURL = "https://cdn41.academy.ca";

    public static string LLNWMediaVaultPathPattern = "/s/CSA.Film/PROD/{mediaId}.mp4/";

    public static string LLNWMediaVaultManifest = "manifest.m3u8";

    public static string LLNWMediaVaultSecret = ""; // Use our secret here

    public static int LLNWMediaVaultTimeToLiveInMinutes = 720;

}

​

public class Program

{

    public static void Main()

    {

        string url = "";

        // What we got from the manifest response - should generate https://cdn41.academy.ca/s/CSA.Film/PROD/10378.mp4/manifest.m3u8?p=51&e=1540963291&cf=1540963291&h=fa0b41a026d32f35467a2049aac2b60d

        url = GetLLNWMediaVaultStreamingLink(10378, DateTime.Parse("2018-10-30T17:21:31+00:00"));

        Console.WriteLine($"Streaming URL is: {url}");

    }

    public static int ToUnixTimeSeconds(DateTime datTime)

    {

        return (int)datTime.Subtract(new DateTime(1970, 1, 1)).TotalSeconds;

    }

    private static string GetLLNWMediaVaultStreamingLink(int mediaId, DateTime dateTime)

    {

        var baseUrl = _configurationManager.LLNWMediaVaultBaseURL;

        var path = _configurationManager.LLNWMediaVaultPathPattern.Replace("{mediaId}", mediaId.ToString());

​

        var manifest = _configurationManager.LLNWMediaVaultManifest;

        var hashSecret = _configurationManager.LLNWMediaVaultSecret;

​

        var ttlInMinutes = _configurationManager.LLNWMediaVaultTimeToLiveInMinutes;

​

        var e = ToUnixTimeSeconds(dateTime.AddMinutes(ttlInMinutes));

        var cf = ToUnixTimeSeconds(dateTime.AddMinutes(ttlInMinutes));

​

        var params_ = $"?p={(baseUrl + path).Length}&e={e}&cf={cf}";

​

        var link = GenerateLLHWLink(baseUrl, params_, path, manifest, hashSecret);

​

        return link;

    }

    private static string GenerateLLHWLink(string baseUrl, string param, string path, string mani, string secret)

    {

        var md5InputUrl = $"{secret}{baseUrl}{path}{param}";

​

        var md5hash = CreateMD5(md5InputUrl);

​

        var authUrl = $"{baseUrl}{path}{mani}{param}&h={md5hash}";

​

        return authUrl;

    }

    private static string CreateMD5(string input)

    {

        // Use input string to calculate MD5 hash

        using (var md5 = MD5.Create())

        {

            var inputBytes = System.Text.Encoding.ASCII.GetBytes(input);

            var hashBytes = md5.ComputeHash(inputBytes);

​

            // Convert the byte array to hexadecimal string

            return string.Join("", hashBytes.Select(x => x.ToString("x2")));

        }

    }

}