meds-processor, part/4, snippet #15

AuthTokenOptions.cs

using System;
using System.Text;
using Microsoft.IdentityModel.Tokens;

namespace MedsProcessor.WebAPI.Infrastructure
{
  public class AuthTokenOptions
  {
    public string Secret { get; set; }
    public string Issuer { get; set; }
    public string Audience { get; set; }
    public DateTime NotBefore => DateTime.UtcNow;
    DateTime IssuedAt => DateTime.UtcNow;
    public long IssuedAtAsUnixEpoch => ToUnixEpochDate(IssuedAt);
    public DateTime Expiration => IssuedAt.Add(ValidFor);
    public TimeSpan ValidFor => TimeSpan.FromSeconds(ValidForSeconds);
    public int ValidForSeconds { get; set; }
    public SymmetricSecurityKey Key => new SymmetricSecurityKey(Encoding.ASCII.GetBytes(Secret));
    public SigningCredentials SigningCredentials =>
      new SigningCredentials(Key, SecurityAlgorithms.HmacSha256);

    private static long ToUnixEpochDate(DateTime date) =>
      (long) Math.Round(
        (date.ToUniversalTime() - new DateTimeOffset(1970, 1, 1, 0, 0, 0, TimeSpan.Zero))
        .TotalSeconds);
  }
}