✨ Typing indicator, mark as read server-side

DysonNetwork.Sphere/Connection/Handlers/MessageTypingHandler.cs

@@ -0,0 +1,74 @@
+using System.Net.WebSockets;
+using DysonNetwork.Sphere.Chat;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.Extensions.Caching.Memory;
+
+namespace DysonNetwork.Sphere.Connection.Handlers;
+
+public class MessageTypingHandler(AppDatabase db, ChatRoomService crs, IMemoryCache cache) : IWebSocketPacketHandler
+{
+    public string PacketType => "messages.typing";
+
+    public async Task HandleAsync(
+        Account.Account currentUser,
+        string deviceId,
+        WebSocketPacket packet,
+        WebSocket socket,
+        WebSocketService srv
+    )
+    {
+        var request = packet.GetData<ChatController.TypingMessageRequest>();
+        if (request is null)
+        {
+            await socket.SendAsync(
+                new ArraySegment<byte>(new WebSocketPacket
+                {
+                    Type = WebSocketPacketType.Error,
+                    ErrorMessage = "Mark message as read requires you provide the ChatRoomId"
+                }.ToBytes()),
+                WebSocketMessageType.Binary,
+                true,
+                CancellationToken.None
+            );
+            return;
+        }
+
+        ChatMember? sender = null;
+        var cacheKey = string.Format(MessageReadHandler.ChatMemberCacheKey, currentUser.Id, request.ChatRoomId);
+        if (cache.TryGetValue(cacheKey, out ChatMember? cachedMember))
+            sender = cachedMember;
+        else
+        {
+            sender = await db.ChatMembers
+                .Where(m => m.AccountId == currentUser.Id && m.ChatRoomId == request.ChatRoomId)
+                .FirstOrDefaultAsync();
+
+            if (sender != null)
+            {
+                var cacheOptions = new MemoryCacheEntryOptions()
+                    .SetAbsoluteExpiration(TimeSpan.FromMinutes(5));
+                cache.Set(cacheKey, sender, cacheOptions);
+            }
+        }
+
+        if (sender is null)
+        {
+            await socket.SendAsync(
+                new ArraySegment<byte>(new WebSocketPacket
+                {
+                    Type = WebSocketPacketType.Error,
+                    ErrorMessage = "User is not a member of the chat room."
+                }.ToBytes()),
+                WebSocketMessageType.Binary,
+                true,
+                CancellationToken.None
+            );
+            return;
+        }
+
+        // Broadcast read statuses
+        var otherMembers = (await crs.ListRoomMembers(request.ChatRoomId)).Select(m => m.AccountId).ToList();
+        foreach (var member in otherMembers)
+            srv.SendPacketToAccount(member, packet);
+    }
+}