using System.Globalization; using System.Net.Http.Headers; using System.Security.Cryptography; using System.Text; namespace Manager.YouTube.Util; public static class AuthenticationUtilities { private const string HeaderScheme = "SAPISIDHASH"; // Dave Thomas @ https://stackoverflow.com/a/32065323/9948300 public static AuthenticationHeaderValue? GetSapisidHashHeader(string sapisid, string origin) { if (string.IsNullOrWhiteSpace(sapisid) || string.IsNullOrWhiteSpace(origin)) return null; var time = GetTime(); var sha1 = HashString($"{time} {sapisid} {origin}"); var completeHash = $"{time}_{sha1}"; return new AuthenticationHeaderValue(HeaderScheme, completeHash); } private static string HashString(string stringData) { var dataBytes = Encoding.ASCII.GetBytes(stringData); var hashData = SHA1.HashData(dataBytes); return hashData.Aggregate(string.Empty, (current, item) => current + item.ToString("x2")); } private static string GetTime() { var st = new DateTime(1970, 1, 1); var t = DateTime.Now.ToUniversalTime() - st; var time = (t.TotalMilliseconds + 0.5).ToString(CultureInfo.InvariantCulture); return time[..10]; } }