Core/Spells: Implemented SPELL_ATTR9_ITEM_PASSIVE_ON_CLIENT

Port From (https://github.com/TrinityCore/TrinityCore/commit/321161230fe557f930bb155729d9150c42c5758c)

Source/Framework/Constants/Spells/SpellConst.cs

@@ -1992,7 +1992,7 @@ namespace Framework.Constants
         JumpchargeNoFacingControl = 0x800000, // JumpCharge - no facing control
         IgnoreCasterHealingModifiers = 0x1000000, // Ignore Caster Healing Modifiers
         DontConsumeChargeIfItemDeleted = 0x2000000, // NYI - some sort of bugfix attribute to prevent double item deletion? // (Programmer Only) Don't consume charge if item deleted
-        Unk26 = 0x4000000, // 26
+        ItemPassiveOnClient = 0x4000000, // Item Passive On Client
         Unk27 = 0x8000000, // 27
         Unk28 = 0x10000000, // 28
         Unk29 = 0x20000000, // 29

Source/Game/Entities/Player/Player.Fields.cs

@@ -37,6 +37,7 @@ namespace Game.Entities
         public List<ItemSetEffect> ItemSetEff = new();
         List<EnchantDuration> m_enchantDuration = new();
         List<Item> m_itemDuration = new();
+        List<uint> m_itemPassives = new();
         List<ObjectGuid> m_itemSoulboundTradeable = new();
         List<ObjectGuid> m_refundableItems = new();
         public List<Item> ItemUpdateQueue = new();

Source/Game/Entities/Player/Player.Items.cs

@@ -2419,6 +2419,17 @@ namespace Game.Entities
             }
             return true;
         }
+
+        void SendItemPassives()
+        {
+            if (m_itemPassives.Empty())
+                return;
+
+            SendItemPassives sendItemPassives = new();
+            sendItemPassives.SpellID.AddRange(m_itemPassives);
+            SendPacket(sendItemPassives);
+        }
+
         public void SendNewItem(Item item, uint quantity, bool pushed, bool created, bool broadcast = false, uint dungeonEncounterId = 0)
         {
             if (item == null) // prevent crash
@@ -3785,6 +3796,17 @@ namespace Game.Entities
 
                 Log.outDebug(LogFilter.Player, "WORLD: cast {0} Equip spellId - {1}", (item != null ? "item" : "itemset"), spellInfo.Id);
 
+                if (spellInfo.HasAttribute(SpellAttr9.ItemPassiveOnClient))
+                {
+                    m_itemPassives.Add(spellInfo.Id);
+                    if (IsInWorld)
+                    {
+                        AddItemPassive addItemPassive = new();
+                        addItemPassive.SpellID = spellInfo.Id;
+                        SendPacket(addItemPassive);
+                    }
+                }
+
                 CastSpell(this, spellInfo.Id, new CastSpellExtraArgs(item));
             }
             else
@@ -3796,6 +3818,17 @@ namespace Game.Entities
                         return;                                     // and remove only not compatible at form change
                 }
 
+                if (spellInfo.HasAttribute(SpellAttr9.ItemPassiveOnClient))
+                {
+                    m_itemPassives.Remove(spellInfo.Id);
+                    if (IsInWorld)
+                    {
+                        RemoveItemPassive removeItemPassive = new();
+                        removeItemPassive.SpellID = spellInfo.Id;
+                        SendPacket(removeItemPassive);
+                    }
+                }
+
                 if (item != null)
                     RemoveAurasDueToItemSpell(spellInfo.Id, item.GetGUID());  // un-apply all spells, not only at-equipped
                 else

Source/Game/Entities/Player/Player.cs

@@ -5798,6 +5798,7 @@ namespace Game.Entities
             SendAurasForTarget(this);
             SendEnchantmentDurations();                             // must be after add to map
             SendItemDurations();                                    // must be after add to map
+            SendItemPassives();                                     // must be after add to map
 
             // raid downscaling - send difficulty to player
             if (GetMap().IsRaid())

Source/Game/Networking/Packets/ItemPackets.cs

@@ -751,6 +751,45 @@ namespace Game.Networking.Packets
         }
     }
 
+    class AddItemPassive : ServerPacket
+    {
+        public uint SpellID;
+
+        public AddItemPassive() : base(ServerOpcodes.AddItemPassive, ConnectionType.Instance) { }
+
+        public override void Write()
+        {
+            _worldPacket.WriteUInt32(SpellID);
+        }
+    }
+
+    class RemoveItemPassive : ServerPacket
+    {
+        public uint SpellID;
+
+        public RemoveItemPassive() : base(ServerOpcodes.RemoveItemPassive, ConnectionType.Instance) { }
+
+        public override void Write()
+        {
+            _worldPacket.WriteUInt32(SpellID);
+        }
+    }
+
+    class SendItemPassives : ServerPacket
+    {
+        public List<uint> SpellID = new();
+
+        public SendItemPassives() : base(ServerOpcodes.SendItemPassives, ConnectionType.Instance) { }
+
+        public override void Write()
+        {
+            _worldPacket.WriteInt32(SpellID.Count);
+            if (!SpellID.Empty())
+                foreach (uint id in SpellID)
+                    _worldPacket.WriteUInt32(id);
+        }
+    }
+
     //Structs
     public class ItemBonuses
     {