SignalR - Sending a message to a specific user using IUserIdProvider NEW 2 0 0

Question

In the latest version of Asp Net SignalR  was added a new way of sending a message to a specific user  using the interface  IUserIdProvider    public interface IUserIdProvider      string GetUserId IRequest request      public class MyHub   Hub      public void Send string userId  string message             Clients User userId  send message            My question is  How do I know to whom I am sending my message  The explanation of this new method is very superficial  And the draft Statement of SignalR 2 0 0 with this bug and does not compile  Has anyone implemented this feature   More Info   http   www asp net signalr overview signalr-20 hubs-api mapping-users-to-connections IUserIdProvider  Hugs

User · Answer

Old thread  but just came across this in a sample  services AddSignalR                AddAzureSignalR options   gt                        options ClaimsProvider   context   gt  new                                 new Claim ClaimTypes NameIdentifier  context Request Query  quot username quot

User · Answer

Look at SignalR Tests for the feature   Test  SendToUser  takes automatically the user identity passed by using a regular owin authentication library   The scenario is you have a user who has connected from multiple devices browsers and you want to push a message to all his active connections

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Here s a start   Open to suggestions improvements   Server  public class ChatHub   Hub       public void SendChatMessage string who  string message                string name   Context User Identity Name          Clients Group name  addChatMessage name  message           Clients Group  2 2 com   addChatMessage name  message              public override Task OnConnected                 string name   Context User Identity Name          Groups Add Context ConnectionId  name            return base OnConnected              JavaScript   Notice how addChatMessage and sendChatMessage are also methods in the server code above         function             Declare a proxy to reference the hub      var chat     connection chatHub         Create a function that the hub can call to broadcast messages      chat client addChatMessage   function  who  message               Html encode display name and message          var encodedName       lt div   gt    text who  html            var encodedMsg       lt div   gt    text message  html               Add the message to the page              chat   append   lt li gt  lt strong gt     encodedName                 lt  strong gt   amp nbsp  amp nbsp     encodedMsg     lt  li gt                    Start the connection        connection hub start   done function                  sendmessage   click function                     Call the Send method on the hub              chat server sendChatMessage     displayname   val        message   val                    Clear text box and reset focus for next comment                  message   val     focus                              Testing

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For anyone trying to do this in asp net core  You can use claims  public class CustomEmailProvider   IUserIdProvider       public virtual string GetUserId HubConnectionContext connection                return connection User  FindFirst ClaimTypes Email   Value           Any identifier can be used  but it must be unique  If you use a name identifier for example  it means if there are multiple users with the same name as the recipient  the message would be delivered to them as well  I have chosen email because it is unique to every user  Then register the service in the startup class  services AddSingleton lt IUserIdProvider  CustomEmailProvider gt      Next  Add the claims during user registration  var result   await  userManager CreateAsync user  Model Password   if  result Succeeded        await  userManager AddClaimAsync user  new Claim ClaimTypes Email  Model Email       To send message to the specific user  public class ChatHub   Hub       public async Task SendMessage string receiver  string message                await Clients User receiver  SendAsync  quot ReceiveMessage quot   message            Note  The message sender won t be notified the message is sent  If you want a notification on the sender s end  Change the SendMessage method to this  public async Task SendMessage string sender  string receiver  string message        await Clients Users sender  receiver  SendAsync  quot ReceiveMessage quot   message      These steps are only necessary if you need to change the default identifier  Otherwise  skip to the last step where you can simply send messages by passing userIds or connectionIds to SendMessage  For more

User · Answer

This is how use SignarR in order to target a specific user  without using any provider     private static ConcurrentDictionary lt string  string gt  clients   new ConcurrentDictionary lt string  string gt       public string Login string username          clients TryAdd Context ConnectionId  username                    return username         The variable  contextIdClient  is equal to Context ConnectionId of the user      once logged in  You have to store that  id  inside a dictionaty for example    Clients Client contextIdClient  send  Hello

User · Answer

SignalR provides ConnectionId for each connection  To find which connection belongs to whom  the user   we need to create a mapping between the connection and the user  This depends on how you identify a user in your application   In SignalR 2 0  this is done by using the inbuilt IPrincipal Identity Name  which is the logged in user identifier as set during the ASP NET authentication   However  you may need to map the connection with the user using a different identifier instead of using the Identity Name  For this purpose this new provider can be used with your custom implementation for mapping user with the connection   Example of Mapping SignalR Users to Connections using IUserIdProvider  Lets assume our application uses a userId to identify each user  Now  we need to send message to a specific user  We have userId and message  but SignalR must also know the mapping between our userId and the connection   To achieve this  first we need to create a new class which implements IUserIdProvider   public class CustomUserIdProvider   IUserIdProvider        public string GetUserId IRequest request                   your logic to fetch a user identifier goes here              for example           var userId   MyCustomUserClass FindUserId request User Identity Name           return userId ToString              The second step is to tell SignalR to use our CustomUserIdProvider instead of the default implementation  This can be done in the Startup cs while initializing the hub configuration   public class Startup       public void Configuration IAppBuilder app                var idProvider   new CustomUserIdProvider             GlobalHost DependencyResolver Register typeof IUserIdProvider        gt  idProvider                         Any connection or hub wire up and configuration should go here         app MapSignalR              Now  you can send message to a specific user using his userId as mentioned in the documentation  like    public class MyHub   Hub      public void Send string userId  string message             Clients User userId  send message            Hope this helps

[asp.net] SignalR - Sending a message to a specific user using (IUserIdProvider) NEW 2.0.0

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[asp.net] SignalR - Sending a message to a specific user using (IUserIdProvider) *NEW 2.0.0*

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[asp.net] SignalR - Sending a message to a specific user using (IUserIdProvider) NEW 2.0.0