JWTHelper

public class JWTHelper
    {
        public static string IssueJwt(TokenModelJwt tokenModel)
        {
            string iss = AppSettings.app(new string[] { "Audience", "Issuer" });
            string aud = AppSettings.app(new string[] { "Audience", "Audience" });
            string secret = AppSettings.app(new string[] { "Audience", "Secret" });
            var claims = new List<Claim> {
                new Claim(JwtRegisteredClaimNames.Jti,  tokenModel.Uid.ToString()),
                new Claim(JwtRegisteredClaimNames.Iat,$"{new DateTimeOffset(DateTime.Now).ToUnixTimeSeconds()}"),
                new Claim(JwtRegisteredClaimNames.Nbf,$"{new DateTimeOffset(DateTime.Now).ToUnixTimeSeconds()}"),
                new Claim(JwtRegisteredClaimNames.Exp,$"{new DateTimeOffset(DateTime.Now.AddSeconds(1000)).ToUnixTimeSeconds()}"),
                new Claim(ClaimTypes.Expiration,DateTime.Now.AddSeconds(1000).ToString()),
                new Claim(JwtRegisteredClaimNames.Iss,iss),
                new Claim(JwtRegisteredClaimNames.Aud,aud)
            };
            claims.AddRange(tokenModel.Role.Split(',').Select(s => new Claim(ClaimTypes.Role, s)));
            var key = new SymmetricSecurityKey(Encoding.UTF8.GetBytes(secret));
            var creds = new SigningCredentials(key, SecurityAlgorithms.HmacSha256);

            var jwt = new JwtSecurityToken(issuer: iss, claims: claims, signingCredentials: creds);
            var jwtHandler = new JwtSecurityTokenHandler();
            var encodedJwt = jwtHandler.WriteToken(jwt);
            return encodedJwt;
        }

        public static TokenModelJwt SerializeJwt(string jwtStr)
        {
            var jwtHandler = new JwtSecurityTokenHandler();
            TokenModelJwt tokenModelJwt = new TokenModelJwt();
            if (!string.IsNullOrEmpty(jwtStr) && jwtHandler.CanReadToken(jwtStr))
            {
                JwtSecurityToken jwtToken = jwtHandler.ReadJwtToken(jwtStr);
                object role;
                jwtToken.Payload.TryGetValue(ClaimTypes.Role, out role);
                tokenModelJwt = new TokenModelJwt
                {
                    Uid = Convert.ToInt32(jwtToken.Id),
                    Role = role == null ? "" : role.ToString()
                };
            }
            return tokenModelJwt;
        }

    }

  public class TokenModelJwt
    {
        public int Uid { get; set; }
        public string Role { get; set; }
        public string Work { get; set; }
    }