Core/Quests: Fix quests that require player to be dead

Closes #1441

src/server/game/Entities/Player/Player.cpp

@@ -2648,6 +2648,24 @@ void Player::ResetAllPowers()
     }
 }
 
+bool Player::CanInteractWithQuestGiver(Object* questGiver)
+{
+    switch (questGiver->GetTypeId())
+    {
+        case TYPEID_UNIT:
+            return GetNPCIfCanInteractWith(questGiver->GetGUID(), UNIT_NPC_FLAG_QUESTGIVER) != NULL;
+        case TYPEID_GAMEOBJECT:
+            return GetGameObjectIfCanInteractWith(questGiver->GetGUID(), GAMEOBJECT_TYPE_QUESTGIVER) != NULL;
+        case TYPEID_PLAYER:
+            return isAlive() && questGiver->ToPlayer()->isAlive();
+        case TYPEID_ITEM:
+            return isAlive();
+        default:
+            break;
+    }
+    return false;
+}
+
 Creature* Player::GetNPCIfCanInteractWith(uint64 guid, uint32 npcflagmask)
 {
     // unit checks

src/server/game/Entities/Player/Player.h

@@ -1081,6 +1081,7 @@ class Player : public Unit, public GridObject<Player>
         void SendTransferAborted(uint32 mapid, TransferAbortReason reason, uint8 arg = 0);
         void SendInstanceResetWarning(uint32 mapid, Difficulty difficulty, uint32 time);
 
+        bool CanInteractWithQuestGiver(Object* questGiver);
         Creature* GetNPCIfCanInteractWith(uint64 guid, uint32 npcflagmask);
         GameObject* GetGameObjectIfCanInteractWith(uint64 guid, GameobjectTypes type) const;
 

src/server/game/Server/Protocol/Handlers/QuestHandler.cpp

@@ -119,9 +119,6 @@ void WorldSession::HandleQuestgiverAcceptQuestOpcode(WorldPacket & recv_data)
     uint32 unk1;
     recv_data >> guid >> quest >> unk1;
 
-    if (!GetPlayer()->isAlive())
-        return;
-
     sLog->outDebug(LOG_FILTER_NETWORKIO, "WORLD: Received CMSG_QUESTGIVER_ACCEPT_QUEST npc = %u, quest = %u, unk1 = %u", uint32(GUID_LOPART(guid)), quest, unk1);
 
     Object* pObject = ObjectAccessor::GetObjectByTypeMask(*_player, guid, TYPEMASK_UNIT|TYPEMASK_GAMEOBJECT|TYPEMASK_ITEM|TYPEMASK_PLAYER);
@@ -135,6 +132,10 @@ void WorldSession::HandleQuestgiverAcceptQuestOpcode(WorldPacket & recv_data)
         return;
     }
 
+    // some kind of WPE protection
+    if (!_player->CanInteractWithQuestGiver(pObject))
+        return;
+
     Quest const* qInfo = sObjectMgr->GetQuestTemplate(quest);
     if (qInfo)
     {
@@ -294,16 +295,14 @@ void WorldSession::HandleQuestgiverChooseRewardOpcode(WorldPacket & recv_data)
         return;
     }
 
-    if (!GetPlayer()->isAlive())
-        return;
-
     sLog->outDebug(LOG_FILTER_NETWORKIO, "WORLD: Received CMSG_QUESTGIVER_CHOOSE_REWARD npc = %u, quest = %u, reward = %u", uint32(GUID_LOPART(guid)), quest, reward);
 
     Object* pObject = ObjectAccessor::GetObjectByTypeMask(*_player, guid, TYPEMASK_UNIT|TYPEMASK_GAMEOBJECT);
-    if (!pObject)
+    if (!pObject || !pObject->hasInvolvedQuest(quest))
         return;
 
-    if (!pObject->hasInvolvedQuest(quest))
+    // some kind of WPE protection
+    if (!_player->CanInteractWithQuestGiver(pObject))
         return;
 
     Quest const *pQuest = sObjectMgr->GetQuestTemplate(quest);
@@ -349,15 +348,16 @@ void WorldSession::HandleQuestgiverRequestRewardOpcode(WorldPacket & recv_data)
     uint64 guid;
     recv_data >> guid >> quest;
 
-    if (!GetPlayer()->isAlive())
-        return;
-
     sLog->outDebug(LOG_FILTER_NETWORKIO, "WORLD: Received CMSG_QUESTGIVER_REQUEST_REWARD npc = %u, quest = %u", uint32(GUID_LOPART(guid)), quest);
 
     Object* pObject = ObjectAccessor::GetObjectByTypeMask(*_player, guid, TYPEMASK_UNIT|TYPEMASK_GAMEOBJECT);
     if (!pObject || !pObject->hasInvolvedQuest(quest))
         return;
 
+    // some kind of WPE protection
+    if (!_player->CanInteractWithQuestGiver(pObject))
+        return;
+
     if (_player->CanCompleteQuest(quest))
         _player->CompleteQuest(quest);
 
@@ -462,10 +462,15 @@ void WorldSession::HandleQuestgiverCompleteQuest(WorldPacket& recv_data)
     uint64 guid;
     recv_data >> guid >> quest;
 
-    if (!_player->isAlive())
+    sLog->outDebug(LOG_FILTER_NETWORKIO, "WORLD: Received CMSG_QUESTGIVER_COMPLETE_QUEST npc = %u, quest = %u", uint32(GUID_LOPART(guid)), quest);
+
+    Object* pObject = ObjectAccessor::GetObjectByTypeMask(*_player, guid, TYPEMASK_UNIT|TYPEMASK_GAMEOBJECT);
+    if (!pObject || !pObject->hasInvolvedQuest(quest))
         return;
 
-    sLog->outDebug(LOG_FILTER_NETWORKIO, "WORLD: Received CMSG_QUESTGIVER_COMPLETE_QUEST npc = %u, quest = %u", uint32(GUID_LOPART(guid)), quest);
+    // some kind of WPE protection
+    if (!_player->CanInteractWithQuestGiver(pObject))
+        return;
 
     Quest const *pQuest = sObjectMgr->GetQuestTemplate(quest);
     if (pQuest)