Core/Quest:

Fixed self-completing quests without NPCs
no, wait
Fixed self-completing quests without NPCs, and fixed some issues with the AUTOCOMPLETE quest flag

src/server/game/Entities/Creature/GossipDef.cpp

@@ -513,7 +513,7 @@ void PlayerMenu::SendQuestQueryResponse(Quest const* quest) const
     data << uint32(quest->GetRewHonorAddition());
     data << float(quest->GetRewHonorMultiplier());
     data << uint32(quest->GetSrcItemId());                  // source item id
-    data << uint32(quest->GetFlags() & 0xFFFF);             // quest flags
+    data << uint32(quest->GetFlags());                      // quest flags
     data << uint32(quest->GetMinimapTargetMark());          // minimap target mark (skull, etc. missing enum)
     data << uint32(quest->GetCharTitleId());                // CharTitleId, new 2.4.0, player gets this title (id from CharTitles)
     data << uint32(quest->GetPlayersSlain());               // players slain

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

@@ -14863,7 +14863,7 @@ void Player::SendPreparedQuest(uint64 guid)
                 if (quest->IsAutoAccept() && CanAddQuest(quest, true) && CanTakeQuest(quest, true))
                     AddQuestAndCheckCompletion(quest, object);
 
-                if ((quest->IsAutoComplete() && quest->IsRepeatable() && !quest->IsDailyOrWeekly()) || quest->HasFlag(QUEST_FLAGS_AUTOCOMPLETE))
+                if (quest->IsAutoComplete() && quest->IsRepeatable() && !quest->IsDailyOrWeekly())
                     PlayerTalkClass->SendQuestGiverRequestItems(quest, guid, CanCompleteRepeatableQuest(quest), true);
                 else
                     PlayerTalkClass->SendQuestGiverQuestDetails(quest, guid, true);
@@ -14931,7 +14931,7 @@ Quest const* Player::GetNextQuest(uint64 guid, Quest const* quest)
     switch (GUID_HIPART(guid))
     {
         case HIGHGUID_PLAYER:
-            ASSERT(quest->HasFlag(QUEST_FLAGS_AUTO_SUBMIT));
+            ASSERT(quest->HasFlag(QUEST_FLAGS_AUTOCOMPLETE));
             return sObjectMgr->GetQuestTemplate(nextQuestID);
         case HIGHGUID_UNIT:
         case HIGHGUID_PET:
@@ -15032,7 +15032,7 @@ bool Player::CanCompleteQuest(uint32 quest_id)
             return false;                                   // not allow re-complete quest
 
         // auto complete quest
-        if ((qInfo->IsAutoComplete() || qInfo->GetFlags() & QUEST_FLAGS_AUTOCOMPLETE) && CanTakeQuest(qInfo, false))
+        if (qInfo->IsAutoComplete() && CanTakeQuest(qInfo, false))
             return true;
 
         QuestStatusMap::iterator itr = m_QuestStatus.find(quest_id);
@@ -15112,7 +15112,7 @@ bool Player::CanCompleteRepeatableQuest(Quest const* quest)
 bool Player::CanRewardQuest(Quest const* quest, bool msg)
 {
     // not auto complete quest and not completed quest (only cheating case, then ignore without message)
-    if (!quest->IsDFQuest() && !quest->IsAutoComplete() && !(quest->GetFlags() & QUEST_FLAGS_AUTOCOMPLETE) && GetQuestStatus(quest->GetQuestId()) != QUEST_STATUS_COMPLETE)
+    if (!quest->IsDFQuest() && !quest->IsAutoComplete() && GetQuestStatus(quest->GetQuestId()) != QUEST_STATUS_COMPLETE)
         return false;
 
     // daily quest can't be rewarded (25 daily quest already completed)

src/server/game/Handlers/QuestHandler.cpp

@@ -273,7 +273,7 @@ void WorldSession::HandleQuestgiverChooseRewardOpcode(WorldPacket& recvData)
 
     Object* object = _player;
 
-    if (!quest->HasFlag(QUEST_FLAGS_AUTO_SUBMIT))
+    if (!quest->HasFlag(QUEST_FLAGS_AUTOCOMPLETE))
     {
         object = ObjectAccessor::GetObjectByTypeMask(*_player, guid, TYPEMASK_UNIT|TYPEMASK_GAMEOBJECT);
         if (!object || !object->hasInvolvedQuest(questId))
@@ -469,26 +469,43 @@ void WorldSession::HandleQuestConfirmAccept(WorldPacket& recvData)
 void WorldSession::HandleQuestgiverCompleteQuest(WorldPacket& recvData)
 {
     uint32 questId;
-    uint64 playerGuid;
+    uint64 guid; // NPC / GameObject guid for normal quest completion. Player guid for self-completed quests
     bool autoCompleteMode;      // 0 - standart complete quest mode with npc, 1 - auto-complete mode
-    recvData >> playerGuid >> questId >> autoCompleteMode;
+    recvData >> guid >> questId >> autoCompleteMode;
 
-    TC_LOG_DEBUG("network", "WORLD: Received CMSG_QUESTGIVER_COMPLETE_QUEST npc = %u, questId = %u", uint32(GUID_LOPART(playerGuid)), questId);
+    TC_LOG_DEBUG("network", "WORLD: Received CMSG_QUESTGIVER_COMPLETE_QUEST npc = %u, questId = %u self-complete: %u", uint32(GUID_LOPART(guid)), questId, autoCompleteMode ? 1 : 0);
 
     Quest const* quest = sObjectMgr->GetQuestTemplate(questId);
     if (!quest)
         return;
 
-    Object* object = ObjectAccessor::GetObjectByTypeMask(*_player, playerGuid, TYPEMASK_UNIT | TYPEMASK_GAMEOBJECT);
-    if (!object || !object->hasInvolvedQuest(questId))
+    if (autoCompleteMode && !quest->HasFlag(QUEST_FLAGS_AUTOCOMPLETE))
+        return;
+
+    Object* object = nullptr;
+    if (autoCompleteMode)
+        object = _player;
+    else
+        object = ObjectAccessor::GetObjectByTypeMask(*_player, guid, TYPEMASK_UNIT | TYPEMASK_GAMEOBJECT);
+    
+    if (!object)
         return;
 
     if (autoCompleteMode == 0)
     {
+        if (!object->hasInvolvedQuest(questId))
+            return;
+
         // some kind of WPE protection
         if (!_player->CanInteractWithQuestGiver(object))
             return;
     }
+    else
+    {
+        // Do not allow completing quests on other players.
+        if (guid != _player->GetGUID())
+            return;
+    }
 
     if (!_player->CanSeeStartQuest(quest) && _player->GetQuestStatus(questId) == QUEST_STATUS_NONE)
     {
@@ -503,16 +520,16 @@ void WorldSession::HandleQuestgiverCompleteQuest(WorldPacket& recvData)
     if (_player->GetQuestStatus(questId) != QUEST_STATUS_COMPLETE)
     {
         if (quest->IsRepeatable())
-            _player->PlayerTalkClass->SendQuestGiverRequestItems(quest, playerGuid, _player->CanCompleteRepeatableQuest(quest), false);
+            _player->PlayerTalkClass->SendQuestGiverRequestItems(quest, guid, _player->CanCompleteRepeatableQuest(quest), false);
         else
-            _player->PlayerTalkClass->SendQuestGiverRequestItems(quest, playerGuid, _player->CanRewardQuest(quest, false), false);
+            _player->PlayerTalkClass->SendQuestGiverRequestItems(quest, guid, _player->CanRewardQuest(quest, false), false);
     }
     else
     {
         if (quest->GetReqItemsCount())                  // some items required
-            _player->PlayerTalkClass->SendQuestGiverRequestItems(quest, playerGuid, _player->CanRewardQuest(quest, false), false);
+            _player->PlayerTalkClass->SendQuestGiverRequestItems(quest, guid, _player->CanRewardQuest(quest, false), false);
         else                                            // no items required
-            _player->PlayerTalkClass->SendQuestGiverOfferReward(quest, playerGuid, true);
+            _player->PlayerTalkClass->SendQuestGiverOfferReward(quest, guid, true);
     }
 
     if (Creature* creature = object->ToCreature())
@@ -586,7 +603,7 @@ void WorldSession::HandlePushQuestToParty(WorldPacket& recvPacket)
         if (quest->IsAutoAccept() && receiver->CanAddQuest(quest, true) && receiver->CanTakeQuest(quest, true))
             receiver->AddQuestAndCheckCompletion(quest, sender);
 
-        if ((quest->IsAutoComplete() && quest->IsRepeatable() && !quest->IsDailyOrWeekly()) || quest->HasFlag(QUEST_FLAGS_AUTOCOMPLETE))
+        if (quest->IsAutoComplete() && quest->IsRepeatable() && !quest->IsDailyOrWeekly())
             receiver->PlayerTalkClass->SendQuestGiverRequestItems(quest, sender->GetGUID(), receiver->CanCompleteRepeatableQuest(quest), true);
         else
         {

src/server/game/Quests/QuestDef.cpp

@@ -326,7 +326,7 @@ bool Quest::IsAutoAccept() const
 
 bool Quest::IsAutoComplete() const
 {
-    return sWorld->getBoolConfig(CONFIG_QUEST_IGNORE_AUTO_COMPLETE) ? false : (Method == 0 || HasFlag(QUEST_FLAGS_AUTOCOMPLETE));
+    return sWorld->getBoolConfig(CONFIG_QUEST_IGNORE_AUTO_COMPLETE) || (Method == 0);
 }
 
 bool Quest::IsRaidQuest(Difficulty difficulty) const

src/server/game/Quests/QuestDef.h

@@ -147,11 +147,11 @@ enum QuestFlags
     QUEST_FLAGS_FLAGS_PVP               = 0x00002000,   // Having this quest in log forces PvP flag
     QUEST_FLAGS_UNAVAILABLE             = 0x00004000,   // Used on quests that are not generically available
     QUEST_FLAGS_WEEKLY                  = 0x00008000,
-    QUEST_FLAGS_AUTOCOMPLETE            = 0x00010000,   // auto complete
+    QUEST_FLAGS_AUTOCOMPLETE            = 0x00010000,   // Quests with this flag player submit automatically by special button in player gui
     QUEST_FLAGS_DISPLAY_ITEM_IN_TRACKER = 0x00020000,   // Displays usable item in quest tracker
     QUEST_FLAGS_OBJ_TEXT                = 0x00040000,   // use Objective text as Complete text
     QUEST_FLAGS_AUTO_ACCEPT             = 0x00080000,   // The client recognizes this flag as auto-accept. However, NONE of the current quests (3.3.5a) have this flag. Maybe blizz used to use it, or will use it in the future.
-    QUEST_FLAGS_AUTO_SUBMIT             = 0x00100000,   // Quests with this flag player submit automatically by special button in player gui
+    QUEST_FLAGS_UNK1                    = 0x00100000,   // 
     QUEST_FLAGS_AUTO_TAKE               = 0x00200000,   // Automatically suggestion of accepting quest. Not from npc.
     //QUEST_FLAGS_UNK2                    = 0x00400000,
     //QUEST_FLAGS_UNK3                    = 0x00800000,   // Found in quest 14069