Battleground/Arena: Properly check RBAC arena join permission before allowing queue.

Port From (https://github.com/TrinityCore/TrinityCore/commit/a69a061d76fe4e142e84c775230e2fcbd6ddb9d4)

Source/Game/Entities/Player/Player.PvP.cs

@@ -751,22 +751,17 @@ namespace Game.Entities
             }
         }
 
+        public bool IsDeserter() { return HasAura(26013); }
+        
         public bool CanJoinToBattleground(Battleground bg)
         {
-            // check Deserter debuff
-            if (HasAura(26013))
-                return false;
+            RBACPermissions perm = RBACPermissions.JoinNormalBg;
+            if (bg.IsArena())
+                perm = RBACPermissions.JoinArenas;
+            else if (bg.IsRandom())
+                perm = RBACPermissions.JoinRandomBg;
 
-            if (bg.IsArena() && !GetSession().HasPermission(RBACPermissions.JoinArenas))
-                return false;
-
-            if (bg.IsRandom() && !GetSession().HasPermission(RBACPermissions.JoinRandomBg))
-                return false;
-
-            if (!GetSession().HasPermission(RBACPermissions.JoinNormalBg))
-                return false;
-
-            return true;
+            return GetSession().HasPermission(perm);
         }
 
         public void ClearAfkReports() { m_bgData.bgAfkReporter.Clear(); }

Source/Game/Groups/Group.cs

@@ -1825,6 +1825,9 @@ namespace Game.Groups
                 // offline member? don't let join
                 if (!member)
                     return GroupJoinBattlegroundResult.JoinFailed;
+                // rbac permissions
+                if (!member.CanJoinToBattleground(bgOrTemplate))
+                    return GroupJoinBattlegroundResult.JoinTimedOut;
                 // don't allow cross-faction join as group
                 if (member.GetTeam() != team)
                 {
@@ -1850,7 +1853,7 @@ namespace Game.Groups
                 if ((bgOrTemplate.GetTypeID() == BattlegroundTypeId.RB || bgOrTemplate.GetTypeID() == BattlegroundTypeId.RandomEpic) && member.InBattlegroundQueue(true) && !isInRandomBgQueue)
                     return GroupJoinBattlegroundResult.InNonRandomBg;
                 // check for deserter debuff in case not arena queue
-                if (bgOrTemplate.GetTypeID() != BattlegroundTypeId.AA && !member.CanJoinToBattleground(bgOrTemplate))
+                if (bgOrTemplate.GetTypeID() != BattlegroundTypeId.AA && member.IsDeserter())
                     return GroupJoinBattlegroundResult.Deserters;
                 // check if member can join any more Battleground queues
                 if (!member.HasFreeBattlegroundQueueId())

Source/Game/Handlers/BattleGroundHandler.cs

@@ -110,14 +110,22 @@ namespace Game
                     return;
                 }
 
-                // check Deserter debuff
+                // check RBAC permissions
                 if (!GetPlayer().CanJoinToBattleground(bg))
+                {
+                    Global.BattlegroundMgr.BuildBattlegroundStatusFailed(out battlefieldStatusFailed, bgQueueTypeId, GetPlayer(), 0, GroupJoinBattlegroundResult.JoinTimedOut);
+                    SendPacket(battlefieldStatusFailed);
+                    return;
+                }
+
+                // check Deserter debuff
+                if (GetPlayer().IsDeserter())
                 {
                     Global.BattlegroundMgr.BuildBattlegroundStatusFailed(out battlefieldStatusFailed, bgQueueTypeId, GetPlayer(), 0, GroupJoinBattlegroundResult.Deserters);
                     SendPacket(battlefieldStatusFailed);
                     return;
                 }
-
+                
                 bool isInRandomBgQueue = _player.InBattlegroundQueueForBattlegroundQueueType(Global.BattlegroundMgr.BGQueueTypeId((ushort)BattlegroundTypeId.RB, BattlegroundQueueIdType.Battleground, false, 0))
                     || _player.InBattlegroundQueueForBattlegroundQueueType(Global.BattlegroundMgr.BGQueueTypeId((ushort)BattlegroundTypeId.RandomEpic, BattlegroundQueueIdType.Battleground, false, 0));
                 if (bgTypeId != BattlegroundTypeId.RB && bgTypeId != BattlegroundTypeId.RandomEpic && isInRandomBgQueue)
@@ -308,7 +316,7 @@ namespace Game
             if (battlefieldPort.AcceptedInvite && bgQueue.GetQueueId().TeamSize == 0)
             {
                 //if player is trying to enter Battleground(not arena!) and he has deserter debuff, we must just remove him from queue
-                if (!GetPlayer().CanJoinToBattleground(bg))
+                if (!GetPlayer().IsDeserter())
                 {
                     // send bg command result to show nice message
                     BattlefieldStatusFailed battlefieldStatus;
@@ -547,6 +555,14 @@ namespace Game
                     continue;
                 }
 
+                if (!GetPlayer().CanJoinToBattleground(bg))
+                {
+                    BattlefieldStatusFailed battlefieldStatus;
+                    Global.BattlegroundMgr.BuildBattlegroundStatusFailed(out battlefieldStatus, bgQueueTypeId, GetPlayer(), 0, GroupJoinBattlegroundResult.JoinFailed, errorGuid);
+                    member.SendPacket(battlefieldStatus);
+                    return;
+                }
+
                 // add to queue
                 uint queueSlot = member.AddBattlegroundQueueId(bgQueueTypeId);