向特定用户发送 Signalr 消息

Question

In my project I have SignalR set up where messages are getting sent to every user that connects to my site. I'm in the process of changing this so my messages only go to those users that generated them. However, I am unable to get my users identity and I was hoping someone would be able to tell me what I've done wrong/missing.

In my StartUp class I have the following lines inside of ConfigureServices :

services.AddSignalR();
services.AddSingleton<IUserIdProvider, NameUserIdProvider>();
services.AddMvc(); 
services.AddAuthentication();

Then in my Configure I have the following lines:

app.UseAuthentication();
app.UseAuthorization();
app.UseWebSockets();
app.UseEndpoints(endpoints =>
{
  endpoints.MapHub<UserErrorHub>("/UserErrorHub", options =>
  {
    options.Transports =
       HttpTransportType.WebSockets |
       HttpTransportType.LongPolling;
  });
  endpoints.MapControllerRoute("default", "{controller=Home}/{action=Index}/{id?}");
});

Next, my view has the following connection string set up in a <script> block:

 var url = "@Url.Content("~/UserErrorHub")";

    var connection = new signalR.HubConnectionBuilder()
        .withUrl(url, { transport: signalR.HttpTransportType.WebSockets | signalR.HttpTransportType.LongPolling}, options =>
        {
            options.UseDefaultCredentials = true;     
        }
        .configureLogging(signalR.LogLevel.Information)
        .build();

And finally I have the following classes in my hub:

public class UserErrorHub : Hub
{
    public async override Task OnConnectedAsync()
    {
        string name;
        var user = Context.User;
        if (user.Identity.IsAuthenticated)
        {
            name = user.Identity.Name;
        }
        else
        {
            name = "anonymous";
        }
        await Clients.All.SendAsync("Message",  "hello there!" + name);
    }

    public async Task Message( string message)
    {
        await Clients.All.SendAsync("ReceiveMessage", message);
    }
}

public class NameUserIdProvider : IUserIdProvider
{
    public string GetUserId(HubConnectionContext connection)
    {
        return connection.User?.Identity?.Name;
    }
}

When I run my project, I am unable to get my Username to appear when I connect, instead all "anonymous" appearing which isn't what I want. Could someone please tell me what it is I'm doing wrong?

Answer 1

For my scenario I had to remove the singalR Endpoints and use the older depriecated way

        app.UseSignalR(builder =>
        {
            builder.MapHub<UserErrorHub >("/userErrorHub");
        });

Don't forget the Authorize attribute on the hub

       [Authorize]

Answer 2

In my project I have SignalR set up where messages are getting sent to every user that connects to my site. I'm in the process of changing this so my messages only go to those users that generated them. However, I am unable to get my users identity and I was hoping someone would be able to tell me what I've done wrong/missing.

In my StartUp class I have the following lines inside of ConfigureServices :

services.AddSignalR();
services.AddSingleton<IUserIdProvider, NameUserIdProvider>();
services.AddMvc(); 
services.AddAuthentication();

Then in my Configure I have the following lines:

app.UseAuthentication();
app.UseAuthorization();
app.UseWebSockets();
app.UseEndpoints(endpoints =>
{
  endpoints.MapHub<UserErrorHub>("/UserErrorHub", options =>
  {
    options.Transports =
       HttpTransportType.WebSockets |
       HttpTransportType.LongPolling;
  });
  endpoints.MapControllerRoute("default", "{controller=Home}/{action=Index}/{id?}");
});

Next, my view has the following connection string set up in a <script> block:

 var url = "@Url.Content("~/UserErrorHub")";

    var connection = new signalR.HubConnectionBuilder()
        .withUrl(url, { transport: signalR.HttpTransportType.WebSockets | signalR.HttpTransportType.LongPolling}, options =>
        {
            options.UseDefaultCredentials = true;     
        }
        .configureLogging(signalR.LogLevel.Information)
        .build();

And finally I have the following classes in my hub:

public class UserErrorHub : Hub
{
    public async override Task OnConnectedAsync()
    {
        string name;
        var user = Context.User;
        if (user.Identity.IsAuthenticated)
        {
            name = user.Identity.Name;
        }
        else
        {
            name = "anonymous";
        }
        await Clients.All.SendAsync("Message",  "hello there!" + name);
    }

    public async Task Message( string message)
    {
        await Clients.All.SendAsync("ReceiveMessage", message);
    }
}

public class NameUserIdProvider : IUserIdProvider
{
    public string GetUserId(HubConnectionContext connection)
    {
        return connection.User?.Identity?.Name;
    }
}

When I run my project, I am unable to get my Username to appear when I connect, instead all "anonymous" appearing which isn't what I want. Could someone please tell me what it is I'm doing wrong?