如何检查密码重置令牌是否已过期？

我正在使用 ASP.NET Identity，并且具有基本的忘记密码/重置密码功能。

当您填写忘记密码的表单时，它会使用以下命令创建一个重置令牌_userManager.GeneratePasswordResetTokenAsync(user)

[HttpPost]
[AllowAnonymous]
[ValidateAntiForgeryToken]
public async Task<IActionResult> ForgotPassword(ForgotPasswordViewModel model)
{
    if (ModelState.IsValid)
    {
        var user = await _userManager.FindByNameAsync(model.Email);
        if (user == null || !(await _userManager.IsEmailConfirmedAsync(user)))
        {
            return View("ForgotPasswordConfirmation");
        }

        var code = await _userManager.GeneratePasswordResetTokenAsync(user);
        var callbackUrl = Url.Action("ResetPassword", "Account", new { userId = user.Id, code = code }, protocol: HttpContext.Request.Scheme);
        await _emailSender.SendEmailAsync(model.Email, "Reset Password",
               $"Please reset your password by clicking here: <a href='{callbackUrl}'>link</a>");
        return View("ForgotPasswordConfirmation");
    }

    // If we got this far, something failed, redisplay form
    return View(model);
}

我注意到重置密码页面的唯一验证是检查代码是否为空，而不是检查它是否仍然有效或未过期。

[HttpGet]
[AllowAnonymous]
public IActionResult ResetPassword(string code = null)
{
    if (code == null)
    {
        throw new Exception("A code must be supplied for password reset.");
    }
    var model = new ResetPasswordViewModel { Code = code };
    return View(model);
}

它实际上不会检查令牌是否有效，直到您尝试重置密码并调用_userManager.ResetPasswordAsync(user, model.Code, model.Password)

我希望能够验证当他们点击“重置密码”页面向用户显示消息时代码仍然有效，而不是在他们尝试重置密码后。

有没有办法检查是否有效？

以下代码可验证重置令牌是否有效：

1. 创建代码并将其发送给用户

var code = await this._userManager.GeneratePasswordResetTokenAsync(user);

2. 验证令牌

[HttpGet]
public async Task<IActionResult> ResetPassword(string UserId, string token)
{
    ...

    ApplicationUser user = //get user;


    if(!await this._userManager.VerifyUserTokenAsync(user,this._userManager.Options.Tokens.PasswordResetTokenProvider, "ResetPassword", token)){
        ViewBag.Message = this._localizer["tokenNotValid"].Value;
    }

    ...
}

查看UserManager代码：https://github.com/aspnet/Identity/blob/rel/2.0.0/src/Microsoft.Extensions.Identity.Core/UserManager.cs#L29 https://github.com/aspnet/Identity/blob/rel/2.0.0/src/Microsoft.Extensions.Identity.Core/UserManager.cs#L29