public async Task <IActionResult> SignInxAsync(string code = null)
        {
            var result = await CoreService.Authentication(code);

            if (!result.IsAuthenticated)
            {
                return(RedirectToPage("/index"));
            }


            var claims = new List <Claim>
            {
                new Claim(ClaimTypes.Name, result.User.Name),
                new Claim("AvatarId", result.User.AvatarId),
                new Claim("DiscordId", result.User.DiscordId.ToString()),
            };

            if (StaticSettings.AdminDiscordId == result.User.DiscordId ||
                StaticSettings.DeveloperDiscordId == result.User.DiscordId)
            {
                claims.Add(new Claim("AdminUSer", ""));
            }

            //   claims.Add(new Claim("AdminUSer", ""));

            //必要に応じてUserを作る

            var claimsIdentity = new ClaimsIdentity(
                claims, CookieAuthenticationDefaults.AuthenticationScheme);

            var authProperties = new AuthenticationProperties
            {
                IsPersistent = true,
                ExpiresUtc   = DateTime.UtcNow.AddDays(10)
            };

            await HttpContext.SignInAsync(
                CookieAuthenticationDefaults.AuthenticationScheme,
                new ClaimsPrincipal(claimsIdentity),
                authProperties);

            return(RedirectToPage("/index"));
        }