c# - SignalR Hub 中的自定义原则

Question

我正在尝试在我的 SignalR Hub 的 OnConnected 方法中使用我的自定义原则。我尝试了以下方法:

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

但运气不好..

它不断抛出错误:

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

是否无法访问 SignalR 中心中的自定义原则？

谢谢!

这是我的中心代码:

[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

您应该构建自己的授权属性

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);
    }
}

然后将此属性应用到您的 Hub。

如果您想了解更多信息，我写了关于此的博客 here更多代码示例