fix(Core/Groups): Level restriction on allowing raid groups (#12110)

src/server/game/Groups/Group.cpp

@@ -18,6 +18,7 @@
 #include "Group.h"
 #include "Battleground.h"
 #include "BattlegroundMgr.h"
+#include "Config.h"
 #include "DatabaseEnv.h"
 #include "GameTime.h"
 #include "GroupMgr.h"
@@ -278,6 +279,16 @@ void Group::ConvertToLFG(bool restricted /*= true*/)
     SendUpdate();
 }
 
+bool Group::CheckLevelForRaid()
+{
+    for (member_citerator citr = m_memberSlots.begin(); citr != m_memberSlots.end(); ++citr)
+        if (Player* player = ObjectAccessor::FindPlayer(citr->guid))
+            if (player->getLevel() < sConfigMgr->GetOption<int32>("Group.Raid.LevelRestriction", 10))
+                return true;
+
+    return false;
+}
+
 void Group::ConvertToRaid()
 {
     m_groupType = GroupType(m_groupType | GROUPTYPE_RAID);

src/server/game/Groups/Group.h

@@ -245,6 +245,7 @@ public:
     uint8 GetMemberGroup(ObjectGuid guid) const;
 
     void ConvertToLFG(bool restricted = true);
+    bool CheckLevelForRaid();
     void ConvertToRaid();
 
     void SetBattlegroundGroup(Battleground* bg);

src/server/game/Handlers/GroupHandler.cpp

@@ -621,6 +621,12 @@ void WorldSession::HandleGroupRaidConvertOpcode(WorldPacket& /*recvData*/)
         return;
 
     /** error handling **/
+    if (group->CheckLevelForRaid())
+    {
+        SendPartyResult(PARTY_OP_INVITE, "", ERR_RAID_DISALLOWED_BY_LEVEL);
+        return;
+    }
+
     if (!group->IsLeader(GetPlayer()->GetGUID()) || group->GetMembersCount() < 2 || group->isLFGGroup()) // pussywizard: not allowed for lfg groups, it is either raid from the beginning or not!
         return;
     /********************/