SignalR Hub中的自定義原理

Question

我正在嘗試在SignalR Hub的OnConnected方法中使用我的自定義原則。 我嘗試了以下方法：

• Context.Request.GetHttpContext（）。用戶
• HttpContext.Current.User
• Thread.CurrentPrincipal中

但沒有運氣..

它不斷拋出錯誤：

Unable to cast object of type 'System.Web.Security.RolePrincipal' to type 'MVCSample.Biz.Profile.MyCustomPrincipal'.

SignalR集線器中是否無法訪問自定義原則？

謝謝！

這是我的集線器代碼：

[Authorize]
public class MBHub : Hub
{
    private readonly ILifetimeScope _hubLifetimeScope;
    private readonly IUserService _userService;        

    public MBHub(ILifetimeScope lifetimeScope)
    {
        _hubLifetimeScope = lifetimeScope.BeginLifetimeScope("AutofacWebRequest");
        _userService = _hubLifetimeScope.Resolve<IUserService>();
    }

    public override Task OnConnected()
    {
        //var idn = (MVCSample.Biz.Profile.MyCustomIdentity)Thread.CurrentPrincipal; <--- THIS DID NOT WORK

        //var idn = (MVCSample.Biz.Profile.MyCustomIdentity)HttpContext.Current.User; <--- THIS DID NOT WORK

        System.Web.HttpContextBase httpContext = Context.Request.GetHttpContext();

        var idn = (MVCSample.Biz.Profile.MyCustomIdentity)httpContext.User.Identity; // <--- THIS IS MY FINAL TRY, DID NOT WORK

        string userName = idn.Name;
        string city = idn.City;
        string connectionId = Context.ConnectionId;

        _userService.AddConnection(connectionId, userName, city, Context.Request.Headers["User-Agent"]);

        return base.OnConnected();
    }


    protected override void Dispose(bool disposing)
    {
        // Dipose the hub lifetime scope when the hub is disposed.
        if (disposing && _hubLifetimeScope != null)
            _hubLifetimeScope.Dispose();

        base.Dispose(disposing);
    }

}

Answer 1

您應該構建自己的Authorize屬性

public class MyAuthorizeAttribute : AuthorizeAttribute
{
    public override bool AuthorizeHubConnection(HubDescriptor hubDescriptor, IRequest request)
    {
        //put our custom user-principal into a magic "server.User" Owin variable
        request.Environment["server.User"] = new MyCustomPrincipal(); //<!-THIS!

        return base.AuthorizeHubConnection(hubDescriptor, request);
    }
}

然后將此屬性應用於您的Hub。

如果你想了解更多這方面的信息，我在這里寫了更多代碼示例