feat(Core/Config): add option for LFG expansion (#7256)

src/server/game/DungeonFinding/LFGMgr.cpp

@@ -394,7 +394,7 @@ namespace lfg
             DungeonProgressionRequirements const* ar = sObjectMgr->GetAccessRequirement(dungeon->map, Difficulty(dungeon->difficulty));
 
             uint32 lockData = 0;
-            if (dungeon->expansion > expansion)
+            if (dungeon->expansion > expansion || dungeon->expansion > sWorld->getIntConfig(CONFIG_LFG_DUNGEON_FINDER_EXPANSION))
                 lockData = LFG_LOCKSTATUS_INSUFFICIENT_EXPANSION;
             else if (DisableMgr::IsDisabledFor(DISABLE_TYPE_MAP, dungeon->map, player))
                 lockData = LFG_LOCKSTATUS_RAID_LOCKED;

src/server/game/World/IWorld.h

@@ -329,6 +329,7 @@ enum WorldIntConfigs
     CONFIG_PRESERVE_CUSTOM_CHANNEL_DURATION,
     CONFIG_PERSISTENT_CHARACTER_CLEAN_FLAGS,
     CONFIG_LFG_OPTIONSMASK,
+    CONFIG_LFG_DUNGEON_FINDER_EXPANSION,
     CONFIG_MAX_INSTANCES_PER_HOUR,
     CONFIG_WINTERGRASP_PLR_MAX,
     CONFIG_WINTERGRASP_PLR_MIN,

src/server/game/World/World.cpp

@@ -1306,6 +1306,7 @@ void World::LoadConfigSettings(bool reload)
 
     // Dungeon finder
     m_int_configs[CONFIG_LFG_OPTIONSMASK] = sConfigMgr->GetOption<int32>("DungeonFinder.OptionsMask", 3);
+    m_int_configs[CONFIG_LFG_DUNGEON_FINDER_EXPANSION] = sConfigMgr->GetOption<int32>("DungeonFinder.Expansion", 2);
 
     // Max instances per hour
     m_int_configs[CONFIG_MAX_INSTANCES_PER_HOUR] = sConfigMgr->GetOption<int32>("AccountInstancesPerHour", 5);

src/server/worldserver/worldserver.conf.dist

@@ -1252,6 +1252,16 @@ DeletedCharacterTicketTrace = 0
 
 DungeonFinder.OptionsMask = 1
 
+#
+#     DungeonFinder.Expansion
+#        Description: Allow setting which expansion can be used in LFG
+#           2 - Wotlk (Default)
+#           1 - TBC
+#           0 - Classic
+#        Default:     2
+
+DungeonFinder.Expansion = 2
+
 #
 #   AccountInstancesPerHour
 #        Description: Controls the max amount of different instances player can enter within hour