add api get message

Author: TranHuyThang9999

Features/Messages/Commands/SendMessageCommandHandler.cs

@@ -42,6 +42,22 @@ public SendMessageCommandHandler(
 
     public async Task<ApiResponse<Message>> Handle(SendMessageCommand request, CancellationToken cancellationToken)
     {
-        throw new NotImplementedException();
+        try
+        {
+            var message = new Message
+            {
+                ChannelId = request.ChannelId,
+                SenderId = _currentUser.Id,
+                Content = request.Content?.Trim()
+            };
+            _messageWriteRepository.AddAsync(message);
+            _messageWriteRepository.CommitAsync();
+
+            return ApiResponse<Message>.Success(message);
+        }
+        catch (Exception e)
+        {
+            return ApiResponse<Message>.InternalServerError();
+        }
     }
 }