hook before a player buys something

src/game/Entities/Player/Player.cpp

@@ -73,6 +73,7 @@
 #include "PoolMgr.h"
 #include "SavingSystem.h"
 #include "TicketMgr.h"
+#include "ScriptMgr.h"
 
 #define ZONE_UPDATE_INTERVAL (2*IN_MILLISECONDS)
 
@@ -21573,6 +21574,12 @@ inline bool Player::_StoreOrEquipNewItem(uint32 vendorslot, uint32 item, uint8 c
 // Return true is the bought item has a max count to force refresh of window by caller
 bool Player::BuyItemFromVendorSlot(uint64 vendorguid, uint32 vendorslot, uint32 item, uint8 count, uint8 bag, uint8 slot)
 { 
+    sScriptMgr->OnBeforeBuyItemFromVendor(this, vendorguid,vendorslot,item,count,bag,slot);
+
+    // this check can be used from the hook to implement a custom vendor process
+    if (item == 0)
+        return true;
+
     // cheating attempt
     if (count < 1) count = 1;
 

src/game/Scripting/ScriptMgr.cpp

@@ -1530,6 +1530,11 @@ void ScriptMgr::OnPlayerMove(Player* player, MovementInfo movementInfo, uint32 o
     FOREACH_SCRIPT(MovementHandlerScript)->OnPlayerMove(player, movementInfo, opcode);
 }
 
+void ScriptMgr::OnBeforeBuyItemFromVendor(Player* player, uint64 vendorguid, uint32 vendorslot, uint32 item, uint8 count, uint8 bag, uint8 slot)
+{
+    FOREACH_SCRIPT(PlayerScript)->OnBeforeBuyItemFromVendor(player, vendorguid, vendorslot, item, count, bag, slot);;
+}
+
 AllMapScript::AllMapScript(const char* name)
     : ScriptObject(name)
 {

src/game/Scripting/ScriptMgr.h

@@ -882,6 +882,9 @@ class PlayerScript : public ScriptObject
         //After receiving item as a quest reward
         virtual void OnQuestRewardItem(Player* player, Item* item, uint32 count) { }
 
+        //Before buying something from any vendor
+        virtual void OnBeforeBuyItemFromVendor(Player* player, uint64 vendorguid, uint32 vendorslot, uint32 item, uint8 count, uint8 bag, uint8 slot);
+
 };
 
 class GuildScript : public ScriptObject
@@ -1191,6 +1194,7 @@ class ScriptMgr
         void OnLootItem(Player* player, Item* item, uint32 count, uint64 lootguid);
         void OnCreateItem(Player* player, Item* item, uint32 count);
         void OnQuestRewardItem(Player* player, Item* item, uint32 count);
+        void OnBeforeBuyItemFromVendor(Player* player, uint64 vendorguid, uint32 vendorslot, uint32 item, uint8 count, uint8 bag, uint8 slot);
 
     public: /* GuildScript */