9 files changed, 172 insertions, 0 deletions

diff --git a/MCServer/Plugins/APIDump/Hooks/OnEntityChangeWorld.lua b/MCServer/Plugins/APIDump/Hooks/OnEntityChangeWorld.lua
new file mode 100644
index 000000000..25072ca5c
--- /dev/null
+++ b/MCServer/Plugins/APIDump/Hooks/OnEntityChangeWorld.lua
@@ -0,0 +1,29 @@
+return
+{
+	HOOK_ENTITY_CHANGE_WORLD =
+	{
+		CalledWhen = "Before a entity is changing the world.",
+		DefaultFnName = "OnEntityChangeWorld",  -- also used as pagename
+		Desc = [[
+			This hook is called before the server moves the {{cEntity|entity}} to the given world. Plugins may
+			refuse the changing of the entity to the new world.<p>
+			See also the {{OnEntityChangedWorld|HOOK_ENTITY_CHANGED_WORLD}} hook for a similar hook is called after the
+			entity has been moved to the world.
+		]],
+		Params =
+		{
+			{ Name = "Entity", Type = "{{cEntity}}", Notes = "The entity that wants to change the world" },
+			{ Name = "World", Type = "{{cWorld}}", Notes = "The world to which the entity wants to change" },
+		},
+		Returns = [[
+			If the function returns false or no value, the next plugin's callback is called. If the function
+			returns true, no other callback is called for this event and the change of the entity to the world is
+			cancelled.
+		]],
+	},  -- HOOK_ENTITY_CHANGE_WORLD
+}
+
+
+
+
+
diff --git a/MCServer/Plugins/APIDump/Hooks/OnEntityChangedWorld.lua b/MCServer/Plugins/APIDump/Hooks/OnEntityChangedWorld.lua
new file mode 100644
index 000000000..00645c152
--- /dev/null
+++ b/MCServer/Plugins/APIDump/Hooks/OnEntityChangedWorld.lua
@@ -0,0 +1,28 @@
+return
+{
+	HOOK_ENTITY_CHANGED_WORLD =
+	{
+		CalledWhen = "After a entity has changed the world.",
+		DefaultFnName = "OnEntityChangedWorld",  -- also used as pagename
+		Desc = [[
+			This hook is called after the server has moved the {{cEntity|entity}} to the given world. This is an information-only
+			callback, the entity is already in the new world.<p>
+			See also the {{OnEntityChangeWorld|HOOK_ENTITY_CHANGE_WORLD}} hook for a similar hook called before the
+			entity is moved to the new world.
+		]],
+		Params =
+		{
+			{ Name = "Entity", Type = "{{cEntity}}", Notes = "The entity that has changed the world" },
+			{ Name = "World", Type = "{{cWorld}}", Notes = "The world from which the entity has come" },
+		},
+		Returns = [[
+			If the function returns false or no value, the next plugin's callback is called. If the function
+			returns true, no other callback is called for this event.
+		]],
+	},  -- HOOK_ENTITY_CHANGED_WORLD
+}
+
+
+
+
+
diff --git a/src/Bindings/Plugin.h b/src/Bindings/Plugin.h
index d0c2bcefa..b4bbfd802 100644
--- a/src/Bindings/Plugin.h
+++ b/src/Bindings/Plugin.h
@@ -56,6 +56,8 @@ public:
 	virtual bool OnDisconnect               (cClientHandle & a_Client, const AString & a_Reason) = 0;
 	virtual bool OnEntityAddEffect          (cEntity & a_Entity, int a_EffectType, int a_EffectDurationTicks, int a_EffectIntensity, double a_DistanceModifier) = 0;
 	virtual bool OnEntityTeleport           (cEntity & a_Entity, const Vector3d & a_OldPosition, const Vector3d & a_NewPosition) = 0;
+	virtual bool OnEntityChangeWorld        (cEntity & a_Entity, cWorld & a_World) = 0;
+	virtual bool OnEntityChangedWorld       (cEntity & a_Entity, cWorld & a_World) = 0;
 	virtual bool OnExecuteCommand           (cPlayer * a_Player, const AStringVector & a_Split, const AString & a_EntireCommand, cPluginManager::CommandResult & a_Result) = 0;
 	virtual bool OnExploded                 (cWorld & a_World, double a_ExplosionSize,   bool a_CanCauseFire,   double a_X, double a_Y, double a_Z, eExplosionSource a_Source, void * a_SourceData) = 0;
 	virtual bool OnExploding                (cWorld & a_World, double & a_ExplosionSize, bool & a_CanCauseFire, double a_X, double a_Y, double a_Z, eExplosionSource a_Source, void * a_SourceData) = 0;
diff --git a/src/Bindings/PluginLua.cpp b/src/Bindings/PluginLua.cpp
index 76d3557a4..a8be26f71 100644
--- a/src/Bindings/PluginLua.cpp
+++ b/src/Bindings/PluginLua.cpp
@@ -534,6 +534,54 @@ bool cPluginLua::OnEntityAddEffect(cEntity & a_Entity, int a_EffectType, int a_E
 
 
 
+bool cPluginLua::OnEntityChangeWorld(cEntity & a_Entity, cWorld & a_World)
+{
+	cCSLock Lock(m_CriticalSection);
+	if (!m_LuaState.IsValid())
+	{
+		return false;
+	}
+	bool res = false;
+	cLuaRefs & Refs = m_HookMap[cPluginManager::HOOK_ENTITY_CHANGE_WORLD];
+	for (cLuaRefs::iterator itr = Refs.begin(), end = Refs.end(); itr != end; ++itr)
+	{
+		m_LuaState.Call((int)(**itr), &a_Entity, &a_World, cLuaState::Return, res);
+		if (res)
+		{
+			return true;
+		}
+	}
+	return false;
+}
+
+
+
+
+
+bool cPluginLua::OnEntityChangedWorld(cEntity & a_Entity, cWorld & a_World)
+{
+	cCSLock Lock(m_CriticalSection);
+	if (!m_LuaState.IsValid())
+	{
+		return false;
+	}
+	bool res = false;
+	cLuaRefs & Refs = m_HookMap[cPluginManager::HOOK_ENTITY_CHANGED_WORLD];
+	for (cLuaRefs::iterator itr = Refs.begin(), end = Refs.end(); itr != end; ++itr)
+	{
+		m_LuaState.Call((int)(**itr), &a_Entity, &a_World, res);
+		if (res)
+		{
+			return true;
+		}
+	}
+	return false;
+}
+
+
+
+
+
 bool cPluginLua::OnExecuteCommand(cPlayer * a_Player, const AStringVector & a_Split, const AString & a_EntireCommand, cPluginManager::CommandResult & a_Result)
 {
 	cCSLock Lock(m_CriticalSection);
@@ -1884,6 +1932,8 @@ const char * cPluginLua::GetHookFnName(int a_HookType)
 		case cPluginManager::HOOK_DISCONNECT:                   return "OnDisconnect";
 		case cPluginManager::HOOK_PLAYER_ANIMATION:             return "OnPlayerAnimation";
 		case cPluginManager::HOOK_ENTITY_ADD_EFFECT:            return "OnEntityAddEffect";
+		case cPluginManager::HOOK_ENTITY_CHANGE_WORLD:          return "OnEntityChangeWorld";
+		case cPluginManager::HOOK_ENTITY_CHANGED_WORLD:         return "OnEntityChangedWorld";
 		case cPluginManager::HOOK_ENTITY_TELEPORT:              return "OnEntityTeleport";
 		case cPluginManager::HOOK_EXECUTE_COMMAND:              return "OnExecuteCommand";
 		case cPluginManager::HOOK_HANDSHAKE:                    return "OnHandshake";
diff --git a/src/Bindings/PluginLua.h b/src/Bindings/PluginLua.h
index 524c249b0..533dc0331 100644
--- a/src/Bindings/PluginLua.h
+++ b/src/Bindings/PluginLua.h
@@ -115,6 +115,8 @@ public:
 	virtual bool OnCraftingNoRecipe         (cPlayer & a_Player, cCraftingGrid & a_Grid, cCraftingRecipe & a_Recipe) override;
 	virtual bool OnDisconnect               (cClientHandle & a_Client, const AString & a_Reason) override;
 	virtual bool OnEntityAddEffect          (cEntity & a_Entity, int a_EffectType, int a_EffectDurationTicks, int a_EffectIntensity, double a_DistanceModifier) override;
+	virtual bool OnEntityChangeWorld        (cEntity & a_Entity, cWorld & a_World) override;
+	virtual bool OnEntityChangedWorld       (cEntity & a_Entity, cWorld & a_World) override;
 	virtual bool OnExecuteCommand           (cPlayer * a_Player, const AStringVector & a_Split, const AString & a_EntireCommand, cPluginManager::CommandResult & a_Result) override;
 	virtual bool OnExploded                 (cWorld & a_World, double a_ExplosionSize,   bool a_CanCauseFire,   double a_X, double a_Y, double a_Z, eExplosionSource a_Source, void * a_SourceData) override;
 	virtual bool OnExploding                (cWorld & a_World, double & a_ExplosionSize, bool & a_CanCauseFire, double a_X, double a_Y, double a_Z, eExplosionSource a_Source, void * a_SourceData) override;
diff --git a/src/Bindings/PluginManager.cpp b/src/Bindings/PluginManager.cpp
index db2493955..cc74c8372 100644
--- a/src/Bindings/PluginManager.cpp
+++ b/src/Bindings/PluginManager.cpp
@@ -525,6 +525,42 @@ bool cPluginManager::CallHookEntityTeleport(cEntity & a_Entity, const Vector3d &
 
 
 
+bool cPluginManager::CallHookEntityChangeWorld(cEntity & a_Entity, cWorld & a_World)
+{
+	FIND_HOOK(HOOK_ENTITY_CHANGE_WORLD);
+	VERIFY_HOOK;
+
+	for (PluginList::iterator itr = Plugins->second.begin(); itr != Plugins->second.end(); ++itr)
+	{
+		if ((*itr)->OnEntityChangeWorld(a_Entity, a_World))
+		{
+			return true;
+		}
+	}
+	return false;
+}
+
+
+
+
+bool cPluginManager::CallHookEntityChangedWorld(cEntity & a_Entity, cWorld & a_World)
+{
+	FIND_HOOK(HOOK_ENTITY_CHANGED_WORLD);
+	VERIFY_HOOK;
+
+	for (PluginList::iterator itr = Plugins->second.begin(); itr != Plugins->second.end(); ++itr)
+	{
+		if ((*itr)->OnEntityChangedWorld(a_Entity, a_World))
+		{
+			return true;
+		}
+	}
+	return false;
+}
+
+
+
+
 bool cPluginManager::CallHookExecuteCommand(cPlayer * a_Player, const AStringVector & a_Split, const AString & a_EntireCommand, CommandResult & a_Result)
 {
 	FIND_HOOK(HOOK_EXECUTE_COMMAND);
diff --git a/src/Bindings/PluginManager.h b/src/Bindings/PluginManager.h
index d8c886b62..2c3eaa75f 100644
--- a/src/Bindings/PluginManager.h
+++ b/src/Bindings/PluginManager.h
@@ -85,6 +85,8 @@ public:
 		HOOK_DISCONNECT,
 		HOOK_PLAYER_ANIMATION,
 		HOOK_ENTITY_ADD_EFFECT,
+		HOOK_ENTITY_CHANGE_WORLD,
+		HOOK_ENTITY_CHANGED_WORLD,
 		HOOK_EXECUTE_COMMAND,
 		HOOK_EXPLODED,
 		HOOK_EXPLODING,
@@ -200,6 +202,8 @@ public:
 	bool CallHookDisconnect               (cClientHandle & a_Client, const AString & a_Reason);
 	bool CallHookEntityAddEffect          (cEntity & a_Entity, int a_EffectType, int a_EffectDurationTicks, int a_EffectIntensity, double a_DistanceModifier);
 	bool CallHookEntityTeleport           (cEntity & a_Entity, const Vector3d & a_OldPosition, const Vector3d & a_NewPosition);
+	bool CallHookEntityChangeWorld        (cEntity & a_Entity, cWorld & a_World);
+	bool CallHookEntityChangedWorld       (cEntity & a_Entity, cWorld & a_World);
 	bool CallHookExecuteCommand           (cPlayer * a_Player, const AStringVector & a_Split, const AString & a_EntireCommand, CommandResult & a_Result);  // If a_Player == nullptr, it is a console cmd
 	bool CallHookExploded                 (cWorld & a_World, double a_ExplosionSize,   bool a_CanCauseFire,   double a_X, double a_Y, double a_Z, eExplosionSource a_Source, void * a_SourceData);
 	bool CallHookExploding                (cWorld & a_World, double & a_ExplosionSize, bool & a_CanCauseFire, double a_X, double a_Y, double a_Z, eExplosionSource a_Source, void * a_SourceData);
diff --git a/src/Entities/Entity.cpp b/src/Entities/Entity.cpp
index 4a909a1fd..bc2b3e93e 100644
--- a/src/Entities/Entity.cpp
+++ b/src/Entities/Entity.cpp
@@ -1403,14 +1403,25 @@ bool cEntity::DoMoveToWorld(cWorld * a_World, bool a_ShouldSendRespawn)
 		return false;
 	}
 
+	//  Ask the plugins if the entity is allowed to change the world
+	if (cRoot::Get()->GetPluginManager()->CallHookEntityChangeWorld(*this, *a_World))
+	{
+		// A Plugin doesn't allow the entity to change the world
+		return false;
+	}
+
 	// Remove all links to the old world
 	SetWorldTravellingFrom(GetWorld());  // cChunk::Tick() handles entity removal
 	GetWorld()->BroadcastDestroyEntity(*this);
 
 	// Queue add to new world
 	a_World->AddEntity(this);
+	cWorld * OldWorld = cRoot::Get()->GetWorld(GetWorld()->GetName());  // Required for the hook HOOK_ENTITY_CHANGED_WORLD
 	SetWorld(a_World);
 
+	// Entity changed the world, call the hook
+	cRoot::Get()->GetPluginManager()->CallHookEntityChangedWorld(*this, *OldWorld);
+
 	return true;
 }
 
diff --git a/src/Entities/Player.cpp b/src/Entities/Player.cpp
index 607a663de..01ad26297 100644
--- a/src/Entities/Player.cpp
+++ b/src/Entities/Player.cpp
@@ -1606,6 +1606,12 @@ bool cPlayer::DoMoveToWorld(cWorld * a_World, bool a_ShouldSendRespawn)
 		return false;
 	}
 	
+	if (cRoot::Get()->GetPluginManager()->CallHookEntityChangeWorld(*this, *a_World))
+	{
+		// A Plugin doesn't allow the player to change the world
+		return false;
+	}
+
 	// Send the respawn packet:
 	if (a_ShouldSendRespawn && (m_ClientHandle != nullptr))
 	{
@@ -1621,6 +1627,7 @@ bool cPlayer::DoMoveToWorld(cWorld * a_World, bool a_ShouldSendRespawn)
 
 	// Queue adding player to the new world, including all the necessary adjustments to the object
 	a_World->AddPlayer(this);
+	cWorld * OldWorld = cRoot::Get()->GetWorld(GetWorld()->GetName());  // Required for the hook HOOK_ENTITY_CHANGED_WORLD
 	SetWorld(a_World);  // Chunks may be streamed before cWorld::AddPlayer() sets the world to the new value
 
 	// Update the view distance.
@@ -1635,6 +1642,9 @@ bool cPlayer::DoMoveToWorld(cWorld * a_World, bool a_ShouldSendRespawn)
 	// Broadcast the player into the new world.
 	a_World->BroadcastSpawnEntity(*this);
 	
+	// Player changed the world, call the hook
+	cRoot::Get()->GetPluginManager()->CallHookEntityChangedWorld(*this, *OldWorld);
+
 	return true;
 }