在.NET Core 1.0 MVC中的视图中使用授权策略的任何方法？

Question

我知道在控制器中,您可以[Authorize("policyName")]毫无问题地编写,但有没有办法在视图中使用策略？我不想User.IsInRole(...)每次都想要授权一些HTML.

编辑:

这是一些代码

Startup.cs - 政策声明

    services.AddAuthorization(options =>
    {
        options.AddPolicy("testPolicy", policy =>
        {
            policy.RequireAuthenticatedUser()
                  .RequireRole("RoleOne", "RoleTwo", "RoleThree")
                  .RequireClaim(ClaimTypes.Email);
        });
    });

管理控制器

[Authorize("testPolicy")]
public class AdminController : Controller
{
    public IActionResult Index()
    {
        return View();
    }
}

导航HTML

<div class="navbar navbar-inverse navbar-fixed-top">
            <div class="container">
                <div class="navbar-collapse collapse">
                    <ul class="nav navbar-nav">
                        <li><a asp-controller="Home" asp-action="Index">Home</a></li> 

                        <!-- I want to implement my policy here. -->
                        @if (User.IsInRole("..."))
                        {
                            <li><a asp-controller="Admin" asp-action="Index">Admin</a></li>
                        }
                    </ul>
                    @await Html.PartialAsync("_LoginPartial")
                </div>
            </div>

Answer 1

我发现此链接可能会有所帮助:https://docs.asp.net/en/latest/security/authorization/views.html

该页面的示例:

@if (await AuthorizationService.AuthorizeAsync(User, "PolicyName"))
{
    <p>This paragraph is displayed because you fulfilled PolicyName.</p>
}

在某些情况下,资源将是您的视图模型,您可以使用与在基于资源的授权期间检查的方式完全相同的方式调用AuthorizeAsync;

@if (await AuthorizationService.AuthorizeAsync(User, Model, Operations.Edit))
{
    <p><a class="btn btn-default" role="button"
        href="@Url.Action("Edit", "Document", new {id= Model.Id})">Edit</a></p>
}

Answer 2

我最终创建了一个标记助手来有条件地隐藏与之关联的元素.

[HtmlTargetElement(Attributes = "policy")]
public class PolicyTagHelper : TagHelper
{
    private readonly IAuthorizationService _authService;
    private readonly ClaimsPrincipal _principal;

    public PolicyTagHelper(IAuthorizationService authService, IHttpContextAccessor httpContextAccessor)
    {
        _authService = authService;
        _principal = httpContextAccessor.HttpContext.User;
    }

    public string Policy { get; set; }

    public override async Task ProcessAsync(TagHelperContext context, TagHelperOutput output)
    {
        // if (!await _authService.AuthorizeAsync(_principal, Policy)) ASP.NET Core 1.x
        if (!(await _authService.AuthorizeAsync(_principal, Policy)).Succeeded)
            output.SuppressOutput();
    }
}

用法

<li policy="testPolicy"><a asp-controller="Admin" asp-action="Index">Admin</a></li>