From d846240633fd94e0d4a8a1235bedd451162dbf3a Mon Sep 17 00:00:00 2001
From: Claude <noreply@anthropic.com>
Date: Sun, 22 Feb 2026 23:00:24 +0000
Subject: [PATCH] Fix infinite decoration gift exploit at max Interior Design
 rank

At Rank 10, Home.GainExp() returned early without setting
DecorationRewardTimestamp, leaving it at the daily-reset value of 0.
The client saw timestamp=0 and kept showing the claim button as
available, allowing unlimited reward claims.

Fix: Move the timestamp update from GainExp into InteriorCheckIn and
add a server-side check that prevents claiming when the timestamp is
already set (non-zero) for the day.

https://claude.ai/code/session_01DPS5yXmeVMzpihRr6UKrjj
---
 Maple2.Model/Game/User/Home.cs               | 1 -
 Maple2.Server.Game/Manager/HousingManager.cs | 5 +++++
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/Maple2.Model/Game/User/Home.cs b/Maple2.Model/Game/User/Home.cs
index 870aae906..2e8f91ba9 100644
--- a/Maple2.Model/Game/User/Home.cs
+++ b/Maple2.Model/Game/User/Home.cs
@@ -158,7 +158,6 @@ public void GainExp(long exp, IReadOnlyDictionary<int, MasteryUgcHousingTable.En
             DecorationLevel++;
         }
 
-        DecorationRewardTimestamp = DateTimeOffset.UtcNow.ToUnixTimeSeconds();
         DecorationExp += exp;
     }
 
diff --git a/Maple2.Server.Game/Manager/HousingManager.cs b/Maple2.Server.Game/Manager/HousingManager.cs
index 560a80541..eafda1f3d 100644
--- a/Maple2.Server.Game/Manager/HousingManager.cs
+++ b/Maple2.Server.Game/Manager/HousingManager.cs
@@ -407,6 +407,10 @@ public void InitNewHome(string characterName, ExportedUgcMapMetadata? template)
     public void InteriorCheckIn(Plot plot) {
         if (session.Field is null) return;
 
+        if (Home.DecorationRewardTimestamp != 0) {
+            return;
+        }
+
         Dictionary<HousingCategory, int> decorationCurrent = plot.Cubes.Values
             .Where(plotCube => plotCube.Metadata.Housing != null)
             .GroupBy(plotCube => plotCube.Metadata.Housing!.HousingCategory)
@@ -468,6 +472,7 @@ public void InteriorCheckIn(Plot plot) {
         }
 
         Home.GainExp(decorationScore, tableMetadata.MasteryUgcHousingTable.Entries);
+        Home.DecorationRewardTimestamp = DateTimeOffset.UtcNow.ToUnixTimeSeconds();
         session.Send(CubePacket.DesignRankReward(Home));
     }