Core/Spells: implement reputation requirements for spells (mostly used in guild spells such as Guild Page)

src/server/game/Spells/Spell.cpp

@@ -5916,6 +5916,11 @@ SpellCastResult Spell::CheckCast(bool strict, uint32* param1 /*= nullptr*/, uint
             return SPELL_FAILED_REQUIRES_SPELL_FOCUS;
     }
 
+    // check reputation
+    if (m_spellInfo->MinFactionId && m_spellInfo->MinReputation && m_caster->IsPlayer())
+        if (m_caster->ToPlayer()->GetReputationRank(m_spellInfo->MinFactionId) < static_cast<ReputationRank>(m_spellInfo->MinReputation))
+            return SPELL_FAILED_REPUTATION;
+
     SpellCastResult castResult = SPELL_CAST_OK;
 
     // always (except passive spells) check items (only player related checks)