[CSM] Client side modding

* rename GameScripting to ServerScripting
* Make getBuiltinLuaPath static serverside
* Add on_shutdown callback
* Add on_receiving_chat_message & on_sending_chat_message callbacks
* ScriptApiBase: use IGameDef instead of Server
  This permits to share common attribute between client & server
* Enable mod security in client side modding without conditions

37 files changed, 488 insertions, 64 deletions

diff --git a/builtin/client/init.lua b/builtin/client/init.lua
new file mode 100644
index 000000000..d14301ade
--- /dev/null
+++ b/builtin/client/init.lua
@@ -0,0 +1,22 @@
+-- Minetest: builtin/client/init.lua
+local scriptpath = core.get_builtin_path()..DIR_DELIM
+local clientpath = scriptpath.."client"..DIR_DELIM
+
+dofile(clientpath .. "register.lua")
+
+-- This is an example function to ensure it's working properly, should be removed before merge
+core.register_on_shutdown(function()
+	print("shutdown client")
+end)
+
+-- This is an example function to ensure it's working properly, should be removed before merge
+core.register_on_receiving_chat_messages(function(message)
+	print("Received message " .. message)
+	return false
+end)
+
+-- This is an example function to ensure it's working properly, should be removed before merge
+core.register_on_sending_chat_messages(function(message)
+	print("Sending message " .. message)
+	return false
+end)
diff --git a/builtin/client/register.lua b/builtin/client/register.lua
new file mode 100644
index 000000000..c793195a1
--- /dev/null
+++ b/builtin/client/register.lua
@@ -0,0 +1,62 @@
+
+core.callback_origins = {}
+
+function core.run_callbacks(callbacks, mode, ...)
+	assert(type(callbacks) == "table")
+	local cb_len = #callbacks
+	if cb_len == 0 then
+		if mode == 2 or mode == 3 then
+			return true
+		elseif mode == 4 or mode == 5 then
+			return false
+		end
+	end
+	local ret
+	for i = 1, cb_len do
+		local cb_ret = callbacks[i](...)
+
+		if mode == 0 and i == 1 or mode == 1 and i == cb_len then
+			ret = cb_ret
+		elseif mode == 2 then
+			if not cb_ret or i == 1 then
+				ret = cb_ret
+			end
+		elseif mode == 3 then
+			if cb_ret then
+				return cb_ret
+			end
+			ret = cb_ret
+		elseif mode == 4 then
+			if (cb_ret and not ret) or i == 1 then
+				ret = cb_ret
+			end
+		elseif mode == 5 and cb_ret then
+			return cb_ret
+		end
+	end
+	return ret
+end
+
+--
+-- Callback registration
+--
+
+local function make_registration()
+	local t = {}
+	local registerfunc = function(func)
+		t[#t + 1] = func
+		core.callback_origins[func] = {
+			mod = core.get_current_modname() or "??",
+			name = debug.getinfo(1, "n").name or "??"
+		}
+		--local origin = core.callback_origins[func]
+		--print(origin.name .. ": " .. origin.mod .. " registering cbk " .. tostring(func))
+	end
+	return t, registerfunc
+end
+
+core.registered_on_shutdown, core.register_on_shutdown = make_registration()
+core.registered_on_receiving_chat_messages, core.register_on_receiving_chat_messages = make_registration()
+core.registered_on_sending_chat_messages, core.register_on_sending_chat_messages = make_registration()
+
+
diff --git a/builtin/init.lua b/builtin/init.lua
index b34ad14a0..590f7fa8c 100644
--- a/builtin/init.lua
+++ b/builtin/init.lua
@@ -27,6 +27,7 @@ minetest = core
 -- Load other files
 local scriptdir = core.get_builtin_path() .. DIR_DELIM
 local gamepath = scriptdir .. "game" .. DIR_DELIM
+local clientpath = scriptdir .. "client" .. DIR_DELIM
 local commonpath = scriptdir .. "common" .. DIR_DELIM
 local asyncpath = scriptdir .. "async" .. DIR_DELIM
 
@@ -45,6 +46,8 @@ elseif INIT == "mainmenu" then
 	end
 elseif INIT == "async" then
 	dofile(asyncpath .. "init.lua")
+elseif INIT == "client" then
+	dofile(clientpath .. "init.lua")
 else
 	error(("Unrecognized builtin initialization type %s!"):format(tostring(INIT)))
 end
diff --git a/src/client.cpp b/src/client.cpp
index 30058a2b0..faf454b35 100644
--- a/src/client.cpp
+++ b/src/client.cpp
@@ -32,28 +32,20 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "client.h"
 #include "network/clientopcodes.h"
 #include "filesys.h"
-#include "porting.h"
 #include "mapblock_mesh.h"
 #include "mapblock.h"
 #include "minimap.h"
-#include "settings.h"
+#include "mods.h"
 #include "profiler.h"
 #include "gettext.h"
-#include "log.h"
-#include "nodemetadata.h"
-#include "itemdef.h"
-#include "shader.h"
 #include "clientmap.h"
 #include "clientmedia.h"
-#include "sound.h"
-#include "IMeshCache.h"
-#include "config.h"
 #include "version.h"
 #include "drawscene.h"
 #include "database-sqlite3.h"
 #include "serialization.h"
 #include "guiscalingfilter.h"
-#include "raycast.h"
+#include "script/clientscripting.h"
 
 extern gui::IGUIEnvironment* guienv;
 
@@ -269,10 +261,36 @@ Client::Client(
 	m_cache_use_tangent_vertices = m_cache_enable_shaders && (
 		g_settings->getBool("enable_bumpmapping") ||
 		g_settings->getBool("enable_parallax_occlusion"));
+
+	m_script = new ClientScripting(this);
+}
+
+void Client::initMods()
+{
+	std::string script_path = getBuiltinLuaPath() + DIR_DELIM "init.lua";
+
+	m_script->loadMod(script_path, BUILTIN_MOD_NAME);
+}
+
+const std::string Client::getBuiltinLuaPath()
+{
+	return porting::path_share + DIR_DELIM + "builtin";
+}
+
+const std::vector<ModSpec>& Client::getMods() const
+{
+	static std::vector<ModSpec> client_modspec_temp;
+	return client_modspec_temp;
+}
+
+const ModSpec* Client::getModSpec(const std::string &modname) const
+{
+	return NULL;
 }
 
 void Client::Stop()
 {
+	m_script->on_shutdown();
 	//request all client managed threads to stop
 	m_mesh_update_thread.stop();
 	// Save local server map
@@ -280,6 +298,8 @@ void Client::Stop()
 		infostream << "Local map saving ended." << std::endl;
 		m_localdb->endSave();
 	}
+
+	delete m_script;
 }
 
 bool Client::isShutdown()
@@ -1553,6 +1573,11 @@ void Client::typeChatMessage(const std::wstring &message)
 	if(message == L"")
 		return;
 
+	// If message was ate by script API, don't send it to server
+	if (m_script->on_sending_message(wide_to_utf8(message))) {
+		return;
+	}
+
 	// Send to others
 	sendChatMessage(message);
 
diff --git a/src/client.h b/src/client.h
index b33358d94..2fdade61a 100644
--- a/src/client.h
+++ b/src/client.h
@@ -305,6 +305,8 @@ private:
 	std::map<u16, u16> m_packets;
 };
 
+class ClientScripting;
+
 class Client : public con::PeerHandler, public InventoryManager, public IGameDef
 {
 public:
@@ -328,6 +330,8 @@ public:
 
 	~Client();
 
+	void initMods();
+
 	/*
 	 request all threads managed by client to be stopped
 	 */
@@ -428,6 +432,10 @@ public:
 	ClientEnvironment& getEnv() { return m_env; }
 	ITextureSource *tsrc() { return getTextureSource(); }
 	ISoundManager *sound() { return getSoundManager(); }
+	static const std::string getBuiltinLuaPath();
+
+	virtual const std::vector<ModSpec> &getMods() const;
+	virtual const ModSpec* getModSpec(const std::string &modname) const;
 
 	// Causes urgent mesh updates (unlike Map::add/removeNodeWithEvent)
 	void removeNode(v3s16 p);
@@ -692,6 +700,8 @@ private:
 	bool m_cache_enable_shaders;
 	bool m_cache_use_tangent_vertices;
 
+	ClientScripting *m_script;
+
 	DISABLE_CLASS_COPY(Client);
 };
 
diff --git a/src/content_abm.cpp b/src/content_abm.cpp
index ee444ae77..2ab3a968c 100644
--- a/src/content_abm.cpp
+++ b/src/content_abm.cpp
@@ -26,7 +26,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "settings.h"
 #include "mapblock.h" // For getNodeBlockPos
 #include "map.h"
-#include "scripting_game.h"
+#include "serverscripting.h"
 #include "log.h"
 
 void add_legacy_abms(ServerEnvironment *env, INodeDefManager *nodedef) {
diff --git a/src/content_sao.cpp b/src/content_sao.cpp
index d4a218505..93662b035 100644
--- a/src/content_sao.cpp
+++ b/src/content_sao.cpp
@@ -26,7 +26,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "nodedef.h"
 #include "remoteplayer.h"
 #include "server.h"
-#include "scripting_game.h"
+#include "serverscripting.h"
 #include "genericobject.h"
 
 std::map<u16, ServerActiveObject::Factory> ServerActiveObject::m_types;
diff --git a/src/emerge.cpp b/src/emerge.cpp
index 1c9719c48..8719a9eb3 100644
--- a/src/emerge.cpp
+++ b/src/emerge.cpp
@@ -40,7 +40,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "mg_schematic.h"
 #include "nodedef.h"
 #include "profiler.h"
-#include "scripting_game.h"
+#include "serverscripting.h"
 #include "server.h"
 #include "serverobject.h"
 #include "settings.h"
diff --git a/src/environment.cpp b/src/environment.cpp
index 8c1aad9d3..737d93ecd 100644
--- a/src/environment.cpp
+++ b/src/environment.cpp
@@ -21,7 +21,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "environment.h"
 #include "collision.h"
 #include "serverobject.h"
-#include "scripting_game.h"
+#include "serverscripting.h"
 #include "server.h"
 #include "daynightratio.h"
 #include "emerge.h"
diff --git a/src/game.cpp b/src/game.cpp
index 55b2ccec9..9868142f7 100644
--- a/src/game.cpp
+++ b/src/game.cpp
@@ -2222,6 +2222,8 @@ bool Game::connectToServer(const std::string &playername,
 
 		fps_control.last_time = device->getTimer()->getTime();
 
+		client->initMods();
+
 		while (device->run()) {
 
 			limitFps(&fps_control, &dtime);
diff --git a/src/gamedef.h b/src/gamedef.h
index cb624bd6a..16b53e24f 100644
--- a/src/gamedef.h
+++ b/src/gamedef.h
@@ -39,6 +39,7 @@ namespace irr { namespace scene {
 	class ISceneManager;
 }}
 
+struct ModSpec;
 /*
 	An interface for fetching game-global definitions like tool and
 	mapnode properties
@@ -68,7 +69,11 @@ public:
 	ICraftDefManager *cdef()     { return getCraftDefManager(); }
 
 	MtEventManager   *event()    { return getEventManager(); }
-	IRollbackManager *rollback() { return getRollbackManager();}
+	IRollbackManager *rollback() { return getRollbackManager(); }
+
+	virtual const std::vector<ModSpec> &getMods() const = 0;
+	virtual const ModSpec* getModSpec(const std::string &modname) const = 0;
+	virtual std::string getWorldPath() const { return ""; }
 };
 
 #endif
diff --git a/src/guiFormSpecMenu.cpp b/src/guiFormSpecMenu.cpp
index ae3fad7c6..19cac6241 100644
--- a/src/guiFormSpecMenu.cpp
+++ b/src/guiFormSpecMenu.cpp
@@ -42,7 +42,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "filesys.h"
 #include "gettime.h"
 #include "gettext.h"
-#include "scripting_game.h"
+#include "serverscripting.h"
 #include "porting.h"
 #include "settings.h"
 #include "client.h"
diff --git a/src/inventorymanager.cpp b/src/inventorymanager.cpp
index 469e7396b..6ebc2994b 100644
--- a/src/inventorymanager.cpp
+++ b/src/inventorymanager.cpp
@@ -20,7 +20,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "inventorymanager.h"
 #include "log.h"
 #include "serverenvironment.h"
-#include "scripting_game.h"
+#include "serverscripting.h"
 #include "serverobject.h"
 #include "settings.h"
 #include "craftdef.h"
diff --git a/src/network/clientpackethandler.cpp b/src/network/clientpackethandler.cpp
index b11f73e86..f1c44c7d8 100644
--- a/src/network/clientpackethandler.cpp
+++ b/src/network/clientpackethandler.cpp
@@ -30,6 +30,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "server.h"
 #include "util/strfnd.h"
 #include "network/clientopcodes.h"
+#include "script/clientscripting.h"
 #include "util/serialize.h"
 #include "util/srp.h"
 #include "tileanimation.h"
@@ -411,7 +412,10 @@ void Client::handleCommand_ChatMessage(NetworkPacket* pkt)
 		message += (wchar_t)read_wchar;
 	}
 
-	m_chat_queue.push(message);
+	// If chat message not consummed by client lua API
+	if (!m_script->on_receiving_message(wide_to_utf8(message))) {
+		m_chat_queue.push(message);
+	}
 }
 
 void Client::handleCommand_ActiveObjectRemoveAdd(NetworkPacket* pkt)
diff --git a/src/network/serverpackethandler.cpp b/src/network/serverpackethandler.cpp
index ac428e8ed..b707c6fad 100644
--- a/src/network/serverpackethandler.cpp
+++ b/src/network/serverpackethandler.cpp
@@ -27,7 +27,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "nodedef.h"
 #include "player.h"
 #include "rollback_interface.h"
-#include "scripting_game.h"
+#include "serverscripting.h"
 #include "settings.h"
 #include "tool.h"
 #include "version.h"
diff --git a/src/script/CMakeLists.txt b/src/script/CMakeLists.txt
index 5ef672ca9..c96ccc816 100644
--- a/src/script/CMakeLists.txt
+++ b/src/script/CMakeLists.txt
@@ -3,16 +3,17 @@ add_subdirectory(cpp_api)
 add_subdirectory(lua_api)
 
 # Used by server and client
-set(common_SCRIPT_SRCS 
-	${CMAKE_CURRENT_SOURCE_DIR}/scripting_game.cpp
+set(common_SCRIPT_SRCS
+	${CMAKE_CURRENT_SOURCE_DIR}/serverscripting.cpp
 	${common_SCRIPT_COMMON_SRCS}
 	${common_SCRIPT_CPP_API_SRCS}
 	${common_SCRIPT_LUA_API_SRCS}
 	PARENT_SCOPE)
 
 # Used by client only
-set(client_SCRIPT_SRCS 
+set(client_SCRIPT_SRCS
 	${CMAKE_CURRENT_SOURCE_DIR}/scripting_mainmenu.cpp
+	${CMAKE_CURRENT_SOURCE_DIR}/clientscripting.cpp
 	${client_SCRIPT_COMMON_SRCS}
 	${client_SCRIPT_CPP_API_SRCS}
 	${client_SCRIPT_LUA_API_SRCS}
diff --git a/src/script/clientscripting.cpp b/src/script/clientscripting.cpp
new file mode 100644
index 000000000..43bc6f94e
--- /dev/null
+++ b/src/script/clientscripting.cpp
@@ -0,0 +1,54 @@
+/*
+Minetest
+Copyright (C) 2013 celeron55, Perttu Ahola <celeron55@gmail.com>
+Copyright (C) 2017 nerzhul, Loic Blot <loic.blot@unix-experience.fr>
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU Lesser General Public License as published by
+the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public License along
+with this program; if not, write to the Free Software Foundation, Inc.,
+51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
+#include "clientscripting.h"
+#include "client.h"
+#include "cpp_api/s_internal.h"
+#include "lua_api/l_client.h"
+#include "lua_api/l_util.h"
+
+ClientScripting::ClientScripting(Client *client):
+	ScriptApiBase()
+{
+	setGameDef(client);
+
+	SCRIPTAPI_PRECHECKHEADER
+
+	// Security is mandatory client side
+	initializeSecurity();
+
+	lua_getglobal(L, "core");
+	int top = lua_gettop(L);
+
+	InitializeModApi(L, top);
+	lua_pop(L, 1);
+
+	// Push builtin initialization type
+	lua_pushstring(L, "client");
+	lua_setglobal(L, "INIT");
+
+	infostream << "SCRIPTAPI: Initialized client game modules" << std::endl;
+}
+
+void ClientScripting::InitializeModApi(lua_State *L, int top)
+{
+	ModApiUtil::Initialize(L, top);
+	ModApiClient::Initialize(L, top);
+}
diff --git a/src/script/clientscripting.h b/src/script/clientscripting.h
new file mode 100644
index 000000000..e2a91f695
--- /dev/null
+++ b/src/script/clientscripting.h
@@ -0,0 +1,40 @@
+/*
+Minetest
+Copyright (C) 2013 celeron55, Perttu Ahola <celeron55@gmail.com>
+Copyright (C) 2017 nerzhul, Loic Blot <loic.blot@unix-experience.fr>
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU Lesser General Public License as published by
+the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public License along
+with this program; if not, write to the Free Software Foundation, Inc.,
+51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
+#ifndef CLIENT_SCRIPTING_H_
+#define CLIENT_SCRIPTING_H_
+
+#include "cpp_api/s_base.h"
+#include "cpp_api/s_client.h"
+#include "cpp_api/s_security.h"
+
+class Client;
+class ClientScripting:
+	virtual public ScriptApiBase,
+	public ScriptApiSecurity,
+	public ScriptApiClient
+{
+public:
+	ClientScripting(Client *client);
+
+private:
+	virtual void InitializeModApi(lua_State *L, int top);
+};
+#endif
diff --git a/src/script/cpp_api/CMakeLists.txt b/src/script/cpp_api/CMakeLists.txt
index be4d0131e..4b13356a8 100644
--- a/src/script/cpp_api/CMakeLists.txt
+++ b/src/script/cpp_api/CMakeLists.txt
@@ -13,6 +13,7 @@ set(common_SCRIPT_CPP_API_SRCS
 	PARENT_SCOPE)
 
 set(client_SCRIPT_CPP_API_SRCS
+	${CMAKE_CURRENT_SOURCE_DIR}/s_client.cpp
 	${CMAKE_CURRENT_SOURCE_DIR}/s_mainmenu.cpp
 	PARENT_SCOPE)
 
diff --git a/src/script/cpp_api/s_base.cpp b/src/script/cpp_api/s_base.cpp
index cbe5735a7..6a843810f 100644
--- a/src/script/cpp_api/s_base.cpp
+++ b/src/script/cpp_api/s_base.cpp
@@ -23,12 +23,14 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "lua_api/l_object.h"
 #include "common/c_converter.h"
 #include "serverobject.h"
-#include "debug.h"
 #include "filesys.h"
-#include "log.h"
 #include "mods.h"
 #include "porting.h"
 #include "util/string.h"
+#include "server.h"
+#ifndef SERVER
+#include "client.h"
+#endif
 
 
 extern "C" {
@@ -69,7 +71,8 @@ public:
 */
 
 ScriptApiBase::ScriptApiBase() :
-	m_luastackmutex()
+	m_luastackmutex(),
+	m_gamedef(NULL)
 {
 #ifdef SCRIPTAPI_LOCK_DEBUG
 	m_lock_recursion_count = 0;
@@ -113,7 +116,6 @@ ScriptApiBase::ScriptApiBase() :
 	// Default to false otherwise
 	m_secure = false;
 
-	m_server = NULL;
 	m_environment = NULL;
 	m_guiengine = NULL;
 }
@@ -333,3 +335,14 @@ void ScriptApiBase::objectrefGet(lua_State *L, u16 id)
 	lua_remove(L, -2); // object_refs
 	lua_remove(L, -2); // core
 }
+
+Server* ScriptApiBase::getServer()
+{
+	return dynamic_cast<Server *>(m_gamedef);
+}
+#ifndef SERVER
+Client* ScriptApiBase::getClient()
+{
+	return dynamic_cast<Client *>(m_gamedef);
+}
+#endif
diff --git a/src/script/cpp_api/s_base.h b/src/script/cpp_api/s_base.h
index c27235255..19d71df65 100644
--- a/src/script/cpp_api/s_base.h
+++ b/src/script/cpp_api/s_base.h
@@ -55,6 +55,10 @@ extern "C" {
 	setOriginFromTableRaw(index, __FUNCTION__)
 
 class Server;
+#ifndef SERVER
+class Client;
+#endif
+class IGameDef;
 class Environment;
 class GUIEngine;
 class ServerActiveObject;
@@ -75,7 +79,11 @@ public:
 	void addObjectReference(ServerActiveObject *cobj);
 	void removeObjectReference(ServerActiveObject *cobj);
 
-	Server* getServer() { return m_server; }
+	IGameDef *getGameDef() { return m_gamedef; }
+	Server* getServer();
+#ifndef SERVER
+	Client* getClient();
+#endif
 
 	std::string getOrigin() { return m_last_run_mod; }
 	void setOriginDirect(const char *origin);
@@ -98,7 +106,7 @@ protected:
 	void scriptError(int result, const char *fxn);
 	void stackDump(std::ostream &o);
 
-	void setServer(Server* server) { m_server = server; }
+	void setGameDef(IGameDef* gamedef) { m_gamedef = gamedef; }
 
 	Environment* getEnv() { return m_environment; }
 	void setEnv(Environment* env) { m_environment = env; }
@@ -122,7 +130,7 @@ private:
 
 	lua_State*      m_luastack;
 
-	Server*         m_server;
+	IGameDef*       m_gamedef;
 	Environment*    m_environment;
 	GUIEngine*      m_guiengine;
 };
diff --git a/src/script/cpp_api/s_client.cpp b/src/script/cpp_api/s_client.cpp
new file mode 100644
index 000000000..08af8ebdc
--- /dev/null
+++ b/src/script/cpp_api/s_client.cpp
@@ -0,0 +1,61 @@
+/*
+Minetest
+Copyright (C) 2013 celeron55, Perttu Ahola <celeron55@gmail.com>
+Copyright (C) 2017 nerzhul, Loic Blot <loic.blot@unix-experience.fr>
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU Lesser General Public License as published by
+the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public License along
+with this program; if not, write to the Free Software Foundation, Inc.,
+51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
+#include "s_client.h"
+#include "s_internal.h"
+
+void ScriptApiClient::on_shutdown()
+{
+	SCRIPTAPI_PRECHECKHEADER
+
+	// Get registered shutdown hooks
+	lua_getglobal(L, "core");
+	lua_getfield(L, -1, "registered_on_shutdown");
+	// Call callbacks
+	runCallbacks(0, RUN_CALLBACKS_MODE_FIRST);
+}
+
+bool ScriptApiClient::on_sending_message(const std::string &message)
+{
+	SCRIPTAPI_PRECHECKHEADER
+
+	// Get core.registered_on_chat_messages
+	lua_getglobal(L, "core");
+	lua_getfield(L, -1, "registered_on_sending_chat_messages");
+	// Call callbacks
+	lua_pushstring(L, message.c_str());
+	runCallbacks(1, RUN_CALLBACKS_MODE_OR_SC);
+	bool ate = lua_toboolean(L, -1);
+	return ate;
+}
+
+bool ScriptApiClient::on_receiving_message(const std::string &message)
+{
+	SCRIPTAPI_PRECHECKHEADER
+
+	// Get core.registered_on_chat_messages
+	lua_getglobal(L, "core");
+	lua_getfield(L, -1, "registered_on_receiving_chat_messages");
+	// Call callbacks
+	lua_pushstring(L, message.c_str());
+	runCallbacks(1, RUN_CALLBACKS_MODE_OR_SC);
+	bool ate = lua_toboolean(L, -1);
+	return ate;
+}
diff --git a/src/script/cpp_api/s_client.h b/src/script/cpp_api/s_client.h
new file mode 100644
index 000000000..08fdd8fc0
--- /dev/null
+++ b/src/script/cpp_api/s_client.h
@@ -0,0 +1,36 @@
+/*
+Minetest
+Copyright (C) 2013 celeron55, Perttu Ahola <celeron55@gmail.com>
+Copyright (C) 2017 nerzhul, Loic Blot <loic.blot@unix-experience.fr>
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU Lesser General Public License as published by
+the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public License along
+with this program; if not, write to the Free Software Foundation, Inc.,
+51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
+#ifndef S_CLIENT_H_
+#define S_CLIENT_H_
+
+#include "cpp_api/s_base.h"
+
+class ScriptApiClient: virtual public ScriptApiBase
+{
+public:
+	// Calls on_shutdown handlers
+	void on_shutdown();
+
+	// Chat message handlers
+	bool on_sending_message(const std::string &message);
+	bool on_receiving_message(const std::string &message);
+};
+#endif
diff --git a/src/script/cpp_api/s_security.cpp b/src/script/cpp_api/s_security.cpp
index be2b884cc..f85cd0c9c 100644
--- a/src/script/cpp_api/s_security.cpp
+++ b/src/script/cpp_api/s_security.cpp
@@ -382,9 +382,9 @@ bool ScriptApiSecurity::checkPath(lua_State *L, const char *path,
 	lua_rawgeti(L, LUA_REGISTRYINDEX, CUSTOM_RIDX_SCRIPTAPI);
 	ScriptApiBase *script = (ScriptApiBase *) lua_touserdata(L, -1);
 	lua_pop(L, 1);
-	const Server *server = script->getServer();
-
-	if (!server) return false;
+	const IGameDef *gamedef = script->getGameDef();
+	if (!gamedef)
+		return false;
 
 	// Get mod name
 	lua_rawgeti(L, LUA_REGISTRYINDEX, CUSTOM_RIDX_CURRENT_MOD_NAME);
@@ -400,7 +400,7 @@ bool ScriptApiSecurity::checkPath(lua_State *L, const char *path,
 		// Allow paths in mod path
 		// Don't bother if write access isn't important, since it will be handled later
 		if (write_required || write_allowed != NULL) {
-			const ModSpec *mod = server->getModSpec(mod_name);
+			const ModSpec *mod = gamedef->getModSpec(mod_name);
 			if (mod) {
 				str = fs::AbsolutePath(mod->path);
 				if (!str.empty() && fs::PathStartsWith(abs_path, str)) {
@@ -414,7 +414,7 @@ bool ScriptApiSecurity::checkPath(lua_State *L, const char *path,
 
 	// Allow read-only access to all mod directories
 	if (!write_required) {
-		const std::vector<ModSpec> mods = server->getMods();
+		const std::vector<ModSpec> mods = gamedef->getMods();
 		for (size_t i = 0; i < mods.size(); ++i) {
 			str = fs::AbsolutePath(mods[i].path);
 			if (!str.empty() && fs::PathStartsWith(abs_path, str)) {
@@ -423,7 +423,7 @@ bool ScriptApiSecurity::checkPath(lua_State *L, const char *path,
 		}
 	}
 
-	str = fs::AbsolutePath(server->getWorldPath());
+	str = fs::AbsolutePath(gamedef->getWorldPath());
 	if (!str.empty()) {
 		// Don't allow access to other paths in the world mod/game path.
 		// These have to be blocked so you can't override a trusted mod
diff --git a/src/script/lua_api/CMakeLists.txt b/src/script/lua_api/CMakeLists.txt
index e82560696..ea3d75ffa 100644
--- a/src/script/lua_api/CMakeLists.txt
+++ b/src/script/lua_api/CMakeLists.txt
@@ -23,5 +23,6 @@ set(common_SCRIPT_LUA_API_SRCS
 	PARENT_SCOPE)
 
 set(client_SCRIPT_LUA_API_SRCS
+	${CMAKE_CURRENT_SOURCE_DIR}/l_client.cpp
 	${CMAKE_CURRENT_SOURCE_DIR}/l_mainmenu.cpp
 	PARENT_SCOPE)
diff --git a/src/script/lua_api/l_client.cpp b/src/script/lua_api/l_client.cpp
new file mode 100644
index 000000000..9c478602a
--- /dev/null
+++ b/src/script/lua_api/l_client.cpp
@@ -0,0 +1,33 @@
+/*
+Minetest
+Copyright (C) 2013 celeron55, Perttu Ahola <celeron55@gmail.com>
+Copyright (C) 2017 nerzhul, Loic Blot <loic.blot@unix-experience.fr>
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU Lesser General Public License as published by
+the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public License along
+with this program; if not, write to the Free Software Foundation, Inc.,
+51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
+#include "l_client.h"
+#include "l_internal.h"
+
+int ModApiClient::l_get_current_modname(lua_State *L)
+{
+	lua_rawgeti(L, LUA_REGISTRYINDEX, CUSTOM_RIDX_CURRENT_MOD_NAME);
+	return 1;
+}
+
+void ModApiClient::Initialize(lua_State *L, int top)
+{
+	API_FCT(get_current_modname);
+}
diff --git a/src/script/lua_api/l_client.h b/src/script/lua_api/l_client.h
new file mode 100644
index 000000000..332f00132
--- /dev/null
+++ b/src/script/lua_api/l_client.h
@@ -0,0 +1,36 @@
+/*
+Minetest
+Copyright (C) 2013 celeron55, Perttu Ahola <celeron55@gmail.com>
+Copyright (C) 2017 nerzhul, Loic Blot <loic.blot@unix-experience.fr>
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU Lesser General Public License as published by
+the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public License along
+with this program; if not, write to the Free Software Foundation, Inc.,
+51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
+#ifndef L_CLIENT_H_
+#define L_CLIENT_H_
+
+#include "lua_api/l_base.h"
+
+class ModApiClient : public ModApiBase
+{
+private:
+	// get_current_modname()
+	static int l_get_current_modname(lua_State *L);
+
+public:
+	static void Initialize(lua_State *L, int top);
+};
+
+#endif
diff --git a/src/script/lua_api/l_env.cpp b/src/script/lua_api/l_env.cpp
index 2722e35a4..442c4b99a 100644
--- a/src/script/lua_api/l_env.cpp
+++ b/src/script/lua_api/l_env.cpp
@@ -25,7 +25,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "lua_api/l_vmanip.h"
 #include "common/c_converter.h"
 #include "common/c_content.h"
-#include "scripting_game.h"
+#include "serverscripting.h"
 #include "environment.h"
 #include "server.h"
 #include "nodedef.h"
@@ -49,7 +49,7 @@ struct EnumString ModApiEnvMod::es_ClearObjectsMode[] =
 void LuaABM::trigger(ServerEnvironment *env, v3s16 p, MapNode n,
 		u32 active_object_count, u32 active_object_count_wider)
 {
-	GameScripting *scriptIface = env->getScriptIface();
+	ServerScripting *scriptIface = env->getScriptIface();
 	scriptIface->realityCheck();
 
 	lua_State *L = scriptIface->getStack();
@@ -92,7 +92,7 @@ void LuaABM::trigger(ServerEnvironment *env, v3s16 p, MapNode n,
 
 void LuaLBM::trigger(ServerEnvironment *env, v3s16 p, MapNode n)
 {
-	GameScripting *scriptIface = env->getScriptIface();
+	ServerScripting *scriptIface = env->getScriptIface();
 	scriptIface->realityCheck();
 
 	lua_State *L = scriptIface->getStack();
diff --git a/src/script/lua_api/l_env.h b/src/script/lua_api/l_env.h
index 21b235f84..322959411 100644
--- a/src/script/lua_api/l_env.h
+++ b/src/script/lua_api/l_env.h
@@ -242,7 +242,7 @@ public:
 };
 
 struct ScriptCallbackState {
-	GameScripting *script;
+	ServerScripting *script;
 	int callback_ref;
 	int args_ref;
 	unsigned int refcount;
diff --git a/src/script/lua_api/l_object.cpp b/src/script/lua_api/l_object.cpp
index 9352812ab..be454ad45 100644
--- a/src/script/lua_api/l_object.cpp
+++ b/src/script/lua_api/l_object.cpp
@@ -29,7 +29,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "content_sao.h"
 #include "server.h"
 #include "hud.h"
-#include "scripting_game.h"
+#include "serverscripting.h"
 
 struct EnumString es_HudElementType[] =
 {
diff --git a/src/script/scripting_game.cpp b/src/script/serverscripting.cpp
index 4da752263..215b2cfd7 100644
--- a/src/script/scripting_game.cpp
+++ b/src/script/serverscripting.cpp
@@ -17,7 +17,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */
 
-#include "scripting_game.h"
+#include "serverscripting.h"
 #include "server.h"
 #include "log.h"
 #include "settings.h"
@@ -47,9 +47,9 @@ extern "C" {
 #include "lualib.h"
 }
 
-GameScripting::GameScripting(Server* server)
+ServerScripting::ServerScripting(Server* server)
 {
-	setServer(server);
+	setGameDef(server);
 
 	// setEnv(env) is called by ScriptApiEnv::initializeEnvironment()
 	// once the environment has been created
@@ -80,7 +80,7 @@ GameScripting::GameScripting(Server* server)
 	infostream << "SCRIPTAPI: Initialized game modules" << std::endl;
 }
 
-void GameScripting::InitializeModApi(lua_State *L, int top)
+void ServerScripting::InitializeModApi(lua_State *L, int top)
 {
 	// Initialize mod api modules
 	ModApiCraft::Initialize(L, top);
diff --git a/src/script/scripting_game.h b/src/script/serverscripting.h
index 970b3e80d..fd97ea40b 100644
--- a/src/script/scripting_game.h
+++ b/src/script/serverscripting.h
@@ -17,8 +17,8 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */
 
-#ifndef SCRIPTING_GAME_H_
-#define SCRIPTING_GAME_H_
+#ifndef SERVER_SCRIPTING_H_
+#define SERVER_SCRIPTING_H_
 
 #include "cpp_api/s_base.h"
 #include "cpp_api/s_entity.h"
@@ -30,10 +30,10 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "cpp_api/s_security.h"
 
 /*****************************************************************************/
-/* Scripting <-> Game Interface                                              */
+/* Scripting <-> Server Game Interface                                       */
 /*****************************************************************************/
 
-class GameScripting :
+class ServerScripting:
 		virtual public ScriptApiBase,
 		public ScriptApiDetached,
 		public ScriptApiEntity,
@@ -44,7 +44,7 @@ class GameScripting :
 		public ScriptApiSecurity
 {
 public:
-	GameScripting(Server* server);
+	ServerScripting(Server* server);
 
 	// use ScriptApiBase::loadMod() to load mods
 
diff --git a/src/server.cpp b/src/server.cpp
index 8b9f46f85..3adbf40cc 100644
--- a/src/server.cpp
+++ b/src/server.cpp
@@ -38,7 +38,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "settings.h"
 #include "profiler.h"
 #include "log.h"
-#include "scripting_game.h"
+#include "serverscripting.h"
 #include "nodedef.h"
 #include "itemdef.h"
 #include "craftdef.h"
@@ -269,7 +269,7 @@ Server::Server(
 	// Initialize scripting
 	infostream<<"Server: Initializing Lua"<<std::endl;
 
-	m_script = new GameScripting(this);
+	m_script = new ServerScripting(this);
 
 	std::string script_path = getBuiltinLuaPath() + DIR_DELIM "init.lua";
 
@@ -3411,7 +3411,7 @@ void Server::getModNames(std::vector<std::string> &modlist)
 		modlist.push_back(it->name);
 }
 
-std::string Server::getBuiltinLuaPath()
+const std::string Server::getBuiltinLuaPath()
 {
 	return porting::path_share + DIR_DELIM + "builtin";
 }
diff --git a/src/server.h b/src/server.h
index 3eee67b78..417d31bd8 100644
--- a/src/server.h
+++ b/src/server.h
@@ -53,7 +53,7 @@ class PlayerSAO;
 class IRollbackManager;
 struct RollbackAction;
 class EmergeManager;
-class GameScripting;
+class ServerScripting;
 class ServerEnvironment;
 struct SimpleSoundSpec;
 class ServerThread;
@@ -274,7 +274,7 @@ public:
 	Inventory* createDetachedInventory(const std::string &name, const std::string &player="");
 
 	// Envlock and conlock should be locked when using scriptapi
-	GameScripting *getScriptIface(){ return m_script; }
+	ServerScripting *getScriptIface(){ return m_script; }
 
 	// actions: time-reversed list
 	// Return value: success/failure
@@ -295,8 +295,8 @@ public:
 	IWritableNodeDefManager* getWritableNodeDefManager();
 	IWritableCraftDefManager* getWritableCraftDefManager();
 
-	const std::vector<ModSpec> &getMods() const { return m_mods; }
-	const ModSpec* getModSpec(const std::string &modname) const;
+	virtual const std::vector<ModSpec> &getMods() const { return m_mods; }
+	virtual const ModSpec* getModSpec(const std::string &modname) const;
 	void getModNames(std::vector<std::string> &modlist);
 	std::string getBuiltinLuaPath();
 	inline const std::string &getWorldPath() const { return m_path_world; }
@@ -540,7 +540,7 @@ private:
 
 	// Scripting
 	// Envlock and conlock should be locked when using Lua
-	GameScripting *m_script;
+	ServerScripting *m_script;
 
 	// Item definition manager
 	IWritableItemDefManager *m_itemdef;
diff --git a/src/serverenvironment.cpp b/src/serverenvironment.cpp
index f3f489092..ecc7c3150 100644
--- a/src/serverenvironment.cpp
+++ b/src/serverenvironment.cpp
@@ -28,7 +28,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "profiler.h"
 #include "raycast.h"
 #include "remoteplayer.h"
-#include "scripting_game.h"
+#include "serverscripting.h"
 #include "server.h"
 #include "voxelalgorithms.h"
 #include "util/serialize.h"
@@ -352,7 +352,7 @@ void ActiveBlockList::update(std::vector<v3s16> &active_positions,
 */
 
 ServerEnvironment::ServerEnvironment(ServerMap *map,
-	GameScripting *scriptIface, Server *server,
+	ServerScripting *scriptIface, Server *server,
 	const std::string &path_world) :
 	m_map(map),
 	m_script(scriptIface),
diff --git a/src/serverenvironment.h b/src/serverenvironment.h
index b7056c00c..b7796b5f1 100644
--- a/src/serverenvironment.h
+++ b/src/serverenvironment.h
@@ -33,7 +33,7 @@ class ServerEnvironment;
 class ActiveBlockModifier;
 class ServerActiveObject;
 class Server;
-class GameScripting;
+class ServerScripting;
 
 /*
 	{Active, Loading} block modifier interface.
@@ -194,7 +194,7 @@ typedef UNORDERED_MAP<u16, ServerActiveObject *> ActiveObjectMap;
 class ServerEnvironment : public Environment
 {
 public:
-	ServerEnvironment(ServerMap *map, GameScripting *scriptIface,
+	ServerEnvironment(ServerMap *map, ServerScripting *scriptIface,
 		Server *server, const std::string &path_world);
 	~ServerEnvironment();
 
@@ -203,7 +203,7 @@ public:
 	ServerMap & getServerMap();
 
 	//TODO find way to remove this fct!
-	GameScripting* getScriptIface()
+	ServerScripting* getScriptIface()
 	{ return m_script; }
 
 	Server *getGameDef()
@@ -381,7 +381,7 @@ private:
 	// The map
 	ServerMap *m_map;
 	// Lua state
-	GameScripting* m_script;
+	ServerScripting* m_script;
 	// Server definition
 	Server *m_server;
 	// World path
diff --git a/src/unittest/test.cpp b/src/unittest/test.cpp
index 41ccf0d2d..9beb0afa6 100644
--- a/src/unittest/test.cpp
+++ b/src/unittest/test.cpp
@@ -19,10 +19,10 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 
 #include "test.h"
 
-#include "log.h"
 #include "nodedef.h"
 #include "itemdef.h"
 #include "gamedef.h"
+#include "mods.h"
 
 content_t t_CONTENT_STONE;
 content_t t_CONTENT_GRASS;
@@ -59,6 +59,13 @@ public:
 
 	void defineSomeNodes();
 
+	virtual const std::vector<ModSpec> &getMods() const
+	{
+		static std::vector<ModSpec> testmodspec;
+		return testmodspec;
+	}
+	virtual const ModSpec* getModSpec(const std::string &modname) const { return NULL; }
+
 private:
 	IItemDefManager *m_itemdef;
 	INodeDefManager *m_nodedef;