squad-rain-ops-mini/Hubs/ChatHub.cs

using Microsoft.AspNetCore.SignalR;
using System.Threading.Tasks;

namespace RainOpsMini.Hubs
{
    public class ChatHub : Hub
    {
        public async Task SendMessage(string user, string message)
        {
            var principal = Context.User;
            if (principal == null || 
               (!principal.HasClaim("Permission", "chat") && 
                !principal.HasClaim("Permission", "all") && 
                principal.FindFirst("IsSuperAdmin")?.Value != "true"))
            {
                throw new HubException("访问被拒绝：权限不足。");
            }

            await Clients.All.SendAsync("ReceiveMessage", user, message);
        }
    }
}