From c61ac08dd3e18d2cebb0fb8a91ad96e538c56bac Mon Sep 17 00:00:00 2001
From: Kei-Luna <touhousetsuna@gmail.com>
Date: Wed, 29 Apr 2026 09:01:20 +0900
Subject: [PATCH] Fixed a critical issue with in-game chat.

---
 GameServer/Command/CommandSender.cs         |  4 +--
 GameServer/Game/Player/ChatMessageHelper.cs | 27 +++++++++++++++++++++
 GameServer/Game/Player/PlayerInstance.cs    |  4 +--
 3 files changed, 31 insertions(+), 4 deletions(-)
 create mode 100644 GameServer/Game/Player/ChatMessageHelper.cs

diff --git a/GameServer/Command/CommandSender.cs b/GameServer/Command/CommandSender.cs
index 0486421..e74e794 100644
--- a/GameServer/Command/CommandSender.cs
+++ b/GameServer/Command/CommandSender.cs
@@ -38,9 +38,9 @@ public class PlayerCommandSender(PlayerInstance player) : ICommandSender
             Type = ChatType.Friend,
             Sender = (uint)ConfigManager.Config.ServerOption.ServerProfile.Uid,
             Recver = (uint)Player.Uid,
-            Text = msg,
+            Text = ChatMessageHelper.NormalizeForClient(msg),
             Profile = Player.ToServerFriendProto(),
-            TimeStamp = (uint)Extensions.GetUnixMs()
+            TimeStamp = ChatMessageHelper.BuildClientTimestamp()
         };
         await Player.SendPacket(CmdIds.NtfFriendChat, data);
     }
diff --git a/GameServer/Game/Player/ChatMessageHelper.cs b/GameServer/Game/Player/ChatMessageHelper.cs
new file mode 100644
index 0000000..bebdf46
--- /dev/null
+++ b/GameServer/Game/Player/ChatMessageHelper.cs
@@ -0,0 +1,27 @@
+using System.Text.RegularExpressions;
+
+namespace MikuSB.GameServer.Game.Player;
+
+public static partial class ChatMessageHelper
+{
+    [GeneratedRegex(@"\s+")]
+    private static partial Regex MultiWhitespaceRegex();
+
+    public static uint BuildClientTimestamp()
+    {
+        return (uint)MikuSB.Util.Extensions.Extensions.GetUnixSec();
+    }
+
+    public static string NormalizeForClient(string? text)
+    {
+        if (string.IsNullOrWhiteSpace(text))
+            return string.Empty;
+
+        var normalized = text
+            .Replace("\r\n", " ")
+            .Replace('\r', ' ')
+            .Replace('\n', ' ');
+
+        return MultiWhitespaceRegex().Replace(normalized, " ").Trim();
+    }
+}
diff --git a/GameServer/Game/Player/PlayerInstance.cs b/GameServer/Game/Player/PlayerInstance.cs
index 1dc1137..a424c18 100644
--- a/GameServer/Game/Player/PlayerInstance.cs
+++ b/GameServer/Game/Player/PlayerInstance.cs
@@ -160,9 +160,9 @@ public class PlayerInstance(PlayerGameData data)
             Sender = sendUid,
             Recver = recvUid,
             Emoji = emojiId ?? 0,
-            Text = message ?? "",
+            Text = ChatMessageHelper.NormalizeForClient(message),
             Profile = Data.ToProfileProto(),
-            TimeStamp = (uint)Extensions.GetUnixMs()
+            TimeStamp = ChatMessageHelper.BuildClientTimestamp()
         };
 
         await SendPacket(CmdIds.NtfFriendChat, data);