asp.net-mvc-3 - 具有 MVC3、ASP.NET 成员资格的多用户应用程序 - 用户身份验证/数据分离

Question

我正在使用 ASP.NET MVC3 和 EF4、一个数据库、一个代码库构建一个简单的多用户( Multi-Tenancy ？)应用程序，所有用户都使用相同的 URL 访问该应用程序。一旦用户登录，他们应该只能访问他们的数据，我使用默认的 asp.NET 成员资格提供程序，并在每个数据表上添加了一个“UserId”Guid 字段。显然我不希望用户 A 对用户 B 的数据有任何访问权限，所以我几乎在我的 Controller 上的每个操作中都添加了以下内容。

public ActionResult EditStatus(int id)
    {
        if (!Request.IsAuthenticated)
            return RedirectToAction("Index", "Home");

        var status = sService.GetStatusById(id);

        // check if the logged in user has access to this status
        if (status.UserId != GetUserId())
            return RedirectToAction("Index", "Home");
    .
    .
    .
    }

    private Guid GetUserId()
    {
        if (Membership.GetUser() != null)
        {
            MembershipUser member = Membership.GetUser();
            Guid id = new Guid(member.ProviderUserKey.ToString());
            return id;
        }
        return Guid.Empty;
    }

这种重复肯定感觉不对，必须有一种更优雅的方式来确保我的用户无法访问彼此的数据——我错过了什么？

Answer 1

what am I missing?

自定义模型绑定(bind)器:

public class StatusModelBinder : DefaultModelBinder
{
    public override object BindModel(ControllerContext controllerContext, ModelBindingContext bindingContext)
    {
        // Fetch the id from the RouteData
        var id = controllerContext.RouteData.Values["id"] as string;

        // TODO: Use constructor injection to pass the service here
        var status = sService.GetStatusById(id);

        // Compare whether the id passed in the request belongs to 
        // the currently logged in user
        if (status.UserId != GetUserId())
        {
            throw new HttpException(403, "Forbidden");
        }
        return status;
    }

    private Guid GetUserId()
    {
        if (Membership.GetUser() != null)
        {
            MembershipUser member = Membership.GetUser();
            Guid id = new Guid(member.ProviderUserKey.ToString());
            return id;
        }
        return Guid.Empty;
    }
}

然后您将在 Application_Start 中注册此模型绑定(bind)器:

// Could use constructor injection to pass the repository to the model binder
ModelBinders.Binders.Add(typeof(Status), new StatusModelBinder());

最后

// The authorize attribute ensures that a user is authenticated. 
// If you want it to redirect to /Home/Index as in your original
// example if the user is not authenticated you could write a custom
// Authorize attribute and do the job there
[Authorize]
public ActionResult EditStatus(Status status)
{
    // if we got that far it means that the user has access to this resource
    // TODO: do something with the status and return some view
    ...
}

结论:我们已经让这个 Controller 节食，这是 Controller 应该的方式:-)