public object Post(
            [FromBody] User usuario,
            [FromServices] UserDatabase usersDAO,
            [FromServices] SigningConfigurations signingConfigurations,
            [FromServices] TokenConfigurations tokenConfigurations)
        {
            bool credenciaisValidas = false;

            if (usuario != null && !String.IsNullOrWhiteSpace(usuario.UserID))
            {
                var usuarioBase = usersDAO.Find(usuario.UserID);
                credenciaisValidas = (usuarioBase != null &&
                                      usuario.UserID == usuarioBase.UserID &&
                                      usuario.AccessKey == usuarioBase.AccessKey);
            }

            if (credenciaisValidas)
            {
                ClaimsIdentity identity = new ClaimsIdentity(
                    new GenericIdentity(usuario.UserID, "Login"),
                    new[] {
                    new Claim(JwtRegisteredClaimNames.Jti, Guid.NewGuid().ToString("N")),
                    new Claim(JwtRegisteredClaimNames.UniqueName, usuario.UserID)
                }
                    );

                DateTime dataCriacao   = DateTime.Now;
                DateTime dataExpiracao = dataCriacao +
                                         TimeSpan.FromSeconds(tokenConfigurations.Seconds);

                var handler       = new JwtSecurityTokenHandler();
                var securityToken = handler.CreateToken(new SecurityTokenDescriptor
                {
                    Issuer             = tokenConfigurations.Issuer,
                    Audience           = tokenConfigurations.Audience,
                    SigningCredentials = signingConfigurations.SigningCredentials,
                    Subject            = identity,
                    NotBefore          = dataCriacao,
                    Expires            = dataExpiracao
                });
                var token = handler.WriteToken(securityToken);

                return(new
                {
                    authenticated = true,
                    created = dataCriacao.ToString("yyyy-MM-dd HH:mm:ss"),
                    expiration = dataExpiracao.ToString("yyyy-MM-dd HH:mm:ss"),
                    accessToken = token,
                    message = "OK"
                });
            }
            else
            {
                return(new
                {
                    authenticated = false,
                    message = "Falha ao autenticar"
                });
            }
        }