From 250dee5be948e96bac656cb72e580026d39105cd Mon Sep 17 00:00:00 2001
From: Meltie2013 <Meltie2013@users.noreply.github.com>
Date: Fri, 29 Oct 2021 08:32:19 -0500
Subject: [PATCH] feat(Core): implement world availability option (#8755)

---
 src/server/game/Handlers/CharacterHandler.cpp | 20 ++++++++++++-------
 src/server/game/World/IWorld.h                |  1 +
 src/server/game/World/World.cpp               |  3 +++
 src/server/shared/SharedDefines.h             | 13 ++++++++++++
 src/server/worldserver/worldserver.conf.dist  |  9 +++++++++
 5 files changed, 39 insertions(+), 7 deletions(-)

diff --git a/src/server/game/Handlers/CharacterHandler.cpp b/src/server/game/Handlers/CharacterHandler.cpp
index 1c9308d3e..2807097d5 100644
--- a/src/server/game/Handlers/CharacterHandler.cpp
+++ b/src/server/game/Handlers/CharacterHandler.cpp
@@ -665,17 +665,23 @@ void WorldSession::HandleCharDeleteOpcode(WorldPacket& recvData)
 
 void WorldSession::HandlePlayerLoginOpcode(WorldPacket& recvData)
 {
-    if (PlayerLoading() || GetPlayer() != nullptr)
-    {
-        LOG_ERROR("network", "Player tries to login again, AccountId = %d", GetAccountId());
-        KickPlayer("WorldSession::HandlePlayerLoginOpcode Another client logging in");
-        return;
-    }
-
     m_playerLoading = true;
     ObjectGuid playerGuid;
     recvData >> playerGuid;
 
+    if (PlayerLoading() || GetPlayer() != nullptr || !playerGuid.IsPlayer())
+    {
+        // limit player interaction with the world
+        if (!sWorld->getBoolConfig(CONFIG_REALM_LOGIN_ENABLED))
+        {
+            WorldPacket data(SMSG_CHARACTER_LOGIN_FAILED, 1);
+            // see LoginFailureReason enum for more reasons
+            data << uint8(LoginFailureReason::NoWorld);
+            SendPacket(&data);
+            return;
+        }
+    }
+
     if (!playerGuid.IsPlayer() || !IsLegitCharacterForAccount(playerGuid))
     {
         LOG_ERROR("network", "Account (%u) can't login with that character (%s).", GetAccountId(), playerGuid.ToString().c_str());
diff --git a/src/server/game/World/IWorld.h b/src/server/game/World/IWorld.h
index fc080d96e..b404541e6 100644
--- a/src/server/game/World/IWorld.h
+++ b/src/server/game/World/IWorld.h
@@ -170,6 +170,7 @@ enum WorldBoolConfigs
     CONFIG_REGEN_HP_CANNOT_REACH_TARGET_IN_RAID,
     CONFIG_SET_BOP_ITEM_TRADEABLE,
     CONFIG_ALLOW_LOGGING_IP_ADDRESSES_IN_DATABASE,
+    CONFIG_REALM_LOGIN_ENABLED,
     BOOL_CONFIG_VALUE_COUNT
 };
 
diff --git a/src/server/game/World/World.cpp b/src/server/game/World/World.cpp
index d776ed3f1..884620d85 100644
--- a/src/server/game/World/World.cpp
+++ b/src/server/game/World/World.cpp
@@ -1436,6 +1436,9 @@ void World::LoadConfigSettings(bool reload)
         LOG_ERROR("server.loading", "LFG.KickPreventionTimer can't be higher than 15 minutes.");
     }
 
+    // Realm Availability
+    m_bool_configs[CONFIG_REALM_LOGIN_ENABLED] = sConfigMgr->GetOption<bool>("World.RealmAvailability", false);
+
     // call ScriptMgr if we're reloading the configuration
     sScriptMgr->OnAfterConfigLoad(reload);
 }
diff --git a/src/server/shared/SharedDefines.h b/src/server/shared/SharedDefines.h
index 521416fa4..9a2e019d1 100644
--- a/src/server/shared/SharedDefines.h
+++ b/src/server/shared/SharedDefines.h
@@ -3597,6 +3597,19 @@ enum ServerProcessTypes
     NUM_SERVER_PROCESS_TYPES
 };
 
+// Login Failure Reasons
+enum class LoginFailureReason : uint8
+{
+    Failed             = 0,
+    NoWorld            = 1,
+    DuplicateCharacter = 2,
+    NoInstances        = 3,
+    Disabled           = 4,
+    NoCharacter        = 5,
+    LockedForTransfer  = 6,
+    LockedByBilling    = 7
+};
+
 namespace Acore::Impl
 {
     struct AC_SHARED_API CurrentServerProcessHolder
diff --git a/src/server/worldserver/worldserver.conf.dist b/src/server/worldserver/worldserver.conf.dist
index 7a524d420..b335ce738 100644
--- a/src/server/worldserver/worldserver.conf.dist
+++ b/src/server/worldserver/worldserver.conf.dist
@@ -3587,6 +3587,15 @@ LFG.MaxKickCount = 2
 
 LFG.KickPreventionTimer = 900
 
+#
+#    World.RealmAvailability
+#        Description: If enabled, players will enter the realm normally.
+#                     Character creation will still be possible even when realm is disabled.
+#        Default:     1 - (Enabled)
+#                     0 - (Disabled)
+
+World.RealmAvailability = 1
+
 #
 ###################################################################################################