前端：

1、完善创建群聊逻辑
后端：
1、完善群聊相关接口

backend/IM_API/Application/EventHandlers/GroupRequestHandler/GroupRequestSignalRHandler.cs

@@ -1,13 +1,17 @@
 using IM_API.Domain.Events;
+using IM_API.Hubs;
 using MassTransit;
+using Microsoft.AspNetCore.SignalR;
 
 namespace IM_API.Application.EventHandlers.GroupRequestHandler
 {
-    public class GroupRequestSignalRHandler : IConsumer<GroupRequestEvent>
+    public class GroupRequestSignalRHandler(IHubContext<ChatHub> hubContext) : IConsumer<GroupRequestEvent>
     {
-        Task IConsumer<GroupRequestEvent>.Consume(ConsumeContext<GroupRequestEvent> context)
+        private readonly IHubContext<ChatHub> _hub = hubContext;
+
+        public async Task Consume(ConsumeContext<GroupRequestEvent> context)
         {
-            throw new NotImplementedException();
+
         }
     }
 }

backend/IM_API/Application/EventHandlers/GroupRequestHandler/NextEventHandler.cs

@@ -0,0 +1,31 @@
+using IM_API.Domain.Events;
+using MassTransit;
+
+namespace IM_API.Application.EventHandlers.GroupRequestHandler
+{
+    public class NextEventHandler : IConsumer<GroupRequestEvent>
+    {
+        private readonly IPublishEndpoint _endpoint;
+        public NextEventHandler(IPublishEndpoint endpoint)
+        {
+            _endpoint = endpoint;
+        }
+
+        public async Task Consume(ConsumeContext<GroupRequestEvent> context)
+        {
+            var @event = context.Message;
+            if(@event.Action == Models.GroupRequestState.Passed)
+            {
+                await _endpoint.Publish(new GroupJoinEvent
+                {
+                    AggregateId = @event.AggregateId,
+                    OccurredAt = @event.OccurredAt,
+                    EventId = Guid.NewGuid(),
+                    GroupId = @event.GroupId,
+                    OperatorId = @event.OperatorId,
+                    UserId = @event.UserId
+                });
+            }
+        }
+    }
+}