JwtWebApi.AuthHandler.ValidateToken C# (CSharp) Méthode

        private static ClaimsPrincipal ValidateToken(string token, string secret, bool checkExpiration)
        {
            var jsonSerializer = new JavaScriptSerializer();
            var payloadJson = JsonWebToken.Decode(token, secret);
            var payloadData = jsonSerializer.Deserialize<Dictionary<string, object>>(payloadJson);

            object exp;
            if (payloadData != null && (checkExpiration && payloadData.TryGetValue("exp", out exp)))
            {
                var validTo = FromUnixTime(long.Parse(exp.ToString()));
                if (DateTime.Compare(validTo, DateTime.UtcNow) <= 0)
                {
                    throw new Exception(
                        string.Format("Token is expired. Expiration: '{0}'. Current: '{1}'", validTo, DateTime.UtcNow));
                }
            }

            var subject = new ClaimsIdentity("Federation", ClaimTypes.Name, ClaimTypes.Role);

            var claims = new List<Claim>();

            if (payloadData != null)
                foreach (var pair in payloadData)
                {
                    var claimType = pair.Key;

                    var source = pair.Value as ArrayList;

                    if (source != null)
                    {
                        claims.AddRange(from object item in source
                                        select new Claim(claimType, item.ToString(), ClaimValueTypes.String));

                        continue;
                    }

                    switch (pair.Key)
                    {
                        case "name":
                            claims.Add(new Claim(ClaimTypes.Name, pair.Value.ToString(), ClaimValueTypes.String));
                            break;
                        case "surname":
                            claims.Add(new Claim(ClaimTypes.Surname, pair.Value.ToString(), ClaimValueTypes.String));
                            break;
                        case "email":
                            claims.Add(new Claim(ClaimTypes.Email, pair.Value.ToString(), ClaimValueTypes.Email));
                            break;
                        case "role":
                            claims.Add(new Claim(ClaimTypes.Role, pair.Value.ToString(), ClaimValueTypes.String));
                            break;
                        case "userId":
                            claims.Add(new Claim(ClaimTypes.UserData, pair.Value.ToString(), ClaimValueTypes.Integer));
                            break;
                        default:
                            claims.Add(new Claim(claimType, pair.Value.ToString(), ClaimValueTypes.String));
                            break;
                    }
                }

            subject.AddClaims(claims);
            return new ClaimsPrincipal(subject);
        }