Core/GameEvent: weekend xp rate

Port From (https://github.com/TrinityCore/TrinityCore/commit/c44650502cf7e7285e3e504d238638ac0ccc7ec6)

Source/Framework/Constants/SharedConst.cs

@@ -1658,6 +1658,7 @@ namespace Framework.Constants
         RateXpGuildModifier,
         RateXpKill,
         RateXpBgKill,
+        RateXpBoost,
         RateXpQuest,
         RealmZone,
         ResetDuelCooldowns,
@@ -1736,7 +1737,8 @@ namespace Framework.Constants
         WintergraspPlrMin,
         WintergraspPlrMinLvl,
         WintergraspRestartAfterCrash,
-        WorldBossLevelDiff
+        WorldBossLevelDiff,
+        XpBoostDaymask
     }
 
     public enum TimerType

Source/Scripts/World/BoostedXp.cs

@@ -0,0 +1,44 @@
+/*
+ * Copyright (C) 2012-2020 CypherCore <http://github.com/CypherCore>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+using Framework.Constants;
+using Game;
+using Game.Entities;
+using Game.Scripting;
+
+namespace Scripts.World
+{
+    class xp_boost_PlayerScript : PlayerScript
+    {
+        public xp_boost_PlayerScript() : base("xp_boost_PlayerScript") { }
+
+        void OnGiveXP(Player player, ref uint amount, Unit unit)
+        {
+            if (IsXPBoostActive())
+                amount *= (uint)WorldConfig.GetFloatValue(WorldCfg.RateXpBoost);
+        }
+
+        bool IsXPBoostActive()
+        {
+            var now = Time.UnixTimeToDateTime(GameTime.GetGameTime()));
+            uint weekdayMaskBoosted = WorldConfig.GetUIntValue(WorldCfg.XpBoostDaymask);
+            uint weekdayMask = (1u << now.Day);
+            bool currentDayBoosted = (weekdayMask & weekdayMaskBoosted) != 0;
+            return currentDayBoosted;
+        }
+    }
+}

Source/WorldServer/WorldServer.conf.dist

@@ -2960,6 +2960,30 @@ AllowTrackBothResources = 0
 
 PlayerStart.AllReputation = 0
 
+#
+#    XP.Boost.Daymask
+#        Description: Enables experience boost during the defined days. This field is a bitmask.
+#
+#        Default:     0 - (Disabled)
+#                     1 - (Sunday)
+#                     2 - (Monday)
+#                     4 - (Tuesday)
+#                     8 - (Wednesday)
+#                     16 - (Thrusday)
+#                     32 - (Friday)
+#                     64 - (Saturday)
+#                     65 - (Weekend only)
+#                     127 - (Always active)
+
+XP.Boost.Daymask = 0
+
+#
+#    XP.Boost.Rate
+#        Description: The boost multiplier for experience gain during XP boosted days.
+#        Default:     2.0 - (Double experience)
+
+XP.Boost.Rate = 2.0
+
 #
 #    PlayerStart.AllSpells
 #        Description: If enabled, players will start with all their class spells (not talents).