public static class JwtOptions
    {
        public const string Issuer = "EvaSys Issuer"; // издатель токенов
        public const string Audience = "EvaSys Client"; // потребитель токена
        const string Key = "1qwedsaf894DFskg0564";


        public static SymmetricSecurityKey GetSymmetricSecurityKey()
        {
            return new SymmetricSecurityKey(Encoding.ASCII.GetBytes(Key));
        }
    }
///////////////



private AuthResultModel GenerateAuthResultForUser(UserModel userModel)
        {
            var key = JwtOptions.GetSymmetricSecurityKey();
            var signingCredentials = new SigningCredentials(key, SecurityAlgorithms.HmacSha256Signature);

            var tokenHandler = new JwtSecurityTokenHandler();
            var tokenDescriptor = new SecurityTokenDescriptor
            {
                Subject = new ClaimsIdentity(new[]
                {
                    new Claim("UserName", userModel.UserName),
                    new Claim(JwtRegisteredClaimNames.Jti, Guid.NewGuid().ToString()),
                    new Claim(JwtRegisteredClaimNames.Email, userModel.Email),
                    new Claim("Role", userModel.Role),
                    new Claim("id", userModel.Id),
                }),
                Expires = DateTime.UtcNow.AddHours(2),

                SigningCredentials = signingCredentials
            };

            var token = tokenHandler.CreateToken(tokenDescriptor);


            return new AuthResultModel
            {
                Token = tokenHandler.WriteToken(token),
                Success = true,
                UserFirstName = userModel.FirstName,
                UserSecondName = userModel.SecondName,
                UserMiddleName = userModel.MiddleName,
                AvatarImage = userModel.AvatarImage,
                UserRole = userModel.Role,
                Username = userModel.UserName,
            };

        }