ASP.NET CORE 3.1 如何從 HandleRequirementAsync 重定向

Question

我正在使用 ASP.NET Core 3.1 和context.Resource作為AuthorizationFilterContext不能用於訪問routeValues或queryString 。 我必須使用IHttpContextAccessor來獲取routeValues["id"]但IHttpContextAccessor沒有Result屬性來設置RedirectToPage("/View", new {id = "...."})

public class NoEditOrDeleteSuperUserHandler : AuthorizationHandler<ManageSuperAdminRequirement>
{
    private readonly IHttpContextAccessor _httpContextAccessor;
    private readonly UserManager<ApplicationUser> _userManager;        

    public NoEditOrDeleteSuperUserHandler(IHttpContextAccessor httpContextAccessor, UserManager<ApplicationUser> userManager)
    {
        this._httpContextAccessor = httpContextAccessor;
        this._userManager = userManager;            
    }
    
    protected override Task HandleRequirementAsync(AuthorizationHandlerContext context, ManageSuperAdminRequirement requirement)
    {
        var userId =  _httpContextAccessor.HttpContext.Request.RouteValues["id"].ToString();
        
        var selectedUser = _userManager.FindByIdAsync(userId).GetAwaiter().GetResult();
        
        
        if (_userManager.IsInRoleAsync(selectedUser,"SuperAdmin").GetAwaiter().GetResult() == false)
        {
            context.Succeed(requirement);
            return Task.CompletedTask;
        }

        context.Fail();
        var Response = _httpContextAccessor.HttpContext.Response;
        var message= Encoding.UTF8.GetBytes("User with Super Admin role cannot be edited");
        
        
        **// return RedirectToPage("/View", new {id = id});**

        Response.OnStarting(async () =>
        {
            _httpContextAccessor.HttpContext.Response.StatusCode = 429;
            await Response.Body.WriteAsync(message, 0, message.Length);
        });
        
        return Task.CompletedTask;
    }
}

我正在使用自定義策略授權，當授權失敗時，我想將用戶重定向到returnUrl而不是訪問被拒絕頁面

Answer 1

我找到了解決上述問題的方法，即在自定義授權檢查失敗后如何將用戶重定向到引用頁面。

請如果有任何更好的方法來做到這一點，請指導我。

1 - 我從HandleRequirementAsync中刪除了以下代碼，並讓它重定向到 AccessDenied Page。

    var Response = _httpContextAccessor.HttpContext.Response;
    var message= Encoding.UTF8.GetBytes("User with Super Admin role cannot be edited");


    **// return RedirectToPage("/View", new {id = id});**

    Response.OnStarting(async () =>
    {
        _httpContextAccessor.HttpContext.Response.StatusCode = 429;
        await Response.Body.WriteAsync(message, 0, message.Length);
    });

2 - 在 AccessDeniedModel class 我添加了以下代碼：

    [TempData]
    public string Message { get; set; }

    public void OnGet()
    {
        Message = "Access Denied: You do not have access to this resource.";
        HttpContext.Response.Redirect(HttpContext.Request.Headers["Referer"]);
    }

4 - 在 /User/Roles/View.cshtml.cs 我定義了一個 model 公共屬性

    [TempData]
    public string Message { get; set; }

3 - 在 /User/Roles/View.cshtml 我添加了<p>@Model.Message</p>以向用戶顯示消息。