Core/Spells: Implemented SPELL_ATTR7_IS_CHEAT_SPELL serverside checks and allow GMs to cast these spells

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

@@ -2782,6 +2782,7 @@ void Player::SetGameMaster(bool on)
         m_ExtraFlags |= PLAYER_EXTRA_GM_ON;
         setFaction(35);
         SetFlag(PLAYER_FLAGS, PLAYER_FLAGS_GM);
+        SetFlag(UNIT_FIELD_FLAGS_2, UNIT_FLAG2_ALLOW_CHEAT_SPELLS);
 
         if (Pet* pet = GetPet())
         {
@@ -2815,6 +2816,7 @@ void Player::SetGameMaster(bool on)
         m_ExtraFlags &= ~ PLAYER_EXTRA_GM_ON;
         setFactionForRace(getRace());
         RemoveFlag(PLAYER_FLAGS, PLAYER_FLAGS_GM);
+        RemoveFlag(UNIT_FIELD_FLAGS_2, UNIT_FLAG2_ALLOW_CHEAT_SPELLS);
 
         if (Pet* pet = GetPet())
         {

src/server/game/Entities/Unit/Unit.h

@@ -591,7 +591,8 @@ enum UnitFlags2
     UNIT_FLAG2_FORCE_MOVE           = 0x00000040,
     UNIT_FLAG2_DISARM_OFFHAND       = 0x00000080,
     UNIT_FLAG2_DISARM_RANGED        = 0x00000400,   // this does not disable ranged weapon display (maybe additional flag needed?)
-    UNIT_FLAG2_REGENERATE_POWER = 0x00000800
+    UNIT_FLAG2_REGENERATE_POWER     = 0x00000800,
+    UNIT_FLAG2_ALLOW_CHEAT_SPELLS   = 0x00040000,   // allows casting spells with AttributesEx7 & SPELL_ATTR7_DISABLED_CLIENT_SIDE
 };
 
 /// Non Player Character flags

src/server/game/Miscellaneous/SharedDefines.h

@@ -518,7 +518,7 @@ enum SpellAttr7
     SPELL_ATTR7_UNK0                             = 0x00000001, //  0 Shaman's new spells (Call of the ...), Feign Death.
     SPELL_ATTR7_UNK1                             = 0x00000002, //  1 Not set in 3.2.2a.
     SPELL_ATTR7_REACTIVATE_AT_RESURRECT          = 0x00000004, //  2 Paladin's auras and 65607 only.
-    SPELL_ATTR7_DISABLED_CLIENT_SIDE             = 0x00000008, //  3 used only by client to disable spells client-side. some sort of special player flag (0x40000) bypasses that restriction
+    SPELL_ATTR7_IS_CHEAT_SPELL                   = 0x00000008, //  3 Cannot cast if caster doesn't have UnitFlag2 & UNIT_FLAG2_ALLOW_CHEAT_SPELLS
     SPELL_ATTR7_UNK4                             = 0x00000010, //  4 Only 66109 test spell.
     SPELL_ATTR7_SUMMON_PLAYER_TOTEM              = 0x00000020, //  5 Only Shaman player totems.
     SPELL_ATTR7_UNK6                             = 0x00000040, //  6 Dark Surge, Surge of Light, Burning Breath triggers (boss spells).

src/server/game/Spells/Spell.cpp

@@ -4606,6 +4606,9 @@ SpellCastResult Spell::CheckCast(bool strict)
         }
     }
 
+    if (m_spellInfo->AttributesEx7 & SPELL_ATTR7_DISABLED_CLIENT_SIDE && !m_caster->HasFlag(UNIT_FIELD_FLAGS_2, UNIT_FLAG2_ALLOW_CHEAT_SPELLS))
+        return SPELL_FAILED_SPELL_UNAVAILABLE;
+
     // Check global cooldown
     if (strict && !m_IsTriggeredSpell && HasGlobalCooldown())
         return SPELL_FAILED_NOT_READY;