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/*
Minetest
Copyright (C) 2013 celeron55, Perttu Ahola <celeron55@gmail.com>

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 "cpp_api/s_base.h"
#include "cpp_api/s_internal.h"
#include "cpp_api/s_security.h"
#include "lua_api/l_object.h"
#include "serverobject.h"
#include "debug.h"
#include "filesys.h"
#include "log.h"
#include "mods.h"
#include "porting.h"
#include "util/string.h"


extern "C" {
#include "lualib.h"
#if USE_LUAJIT
	#include "luajit.h"
#endif
}

#include <stdio.h>
#include <cstdarg>


class ModNameStorer
{
private:
	lua_State *L;
public:
	ModNameStorer(lua_State *L_, const std::string &mod_name):
		L(L_)
	{
		// Store current mod name in registry
		lua_pushstring(L, mod_name.c_str());
		lua_setfield(L, LUA_REGISTRYINDEX, SCRIPT_MOD_NAME_FIELD);
	}
	~ModNameStorer()
	{
		// Clear current mod name from registry
		lua_pushnil(L);
		lua_setfield(L, LUA_REGISTRYINDEX, SCRIPT_MOD_NAME_FIELD);
	}
};


/*
	ScriptApiBase
*/

ScriptApiBase::ScriptApiBase()
{
	#ifdef SCRIPTAPI_LOCK_DEBUG
	m_locked = false;
	#endif

	m_luastack = luaL_newstate();
	FATAL_ERROR_IF(!m_luastack, "luaL_newstate() failed");

	luaL_openlibs(m_luastack);

	// Add and save an error handler
	lua_pushcfunction(m_luastack, script_error_handler);
	m_errorhandler = lua_gettop(m_luastack);

	// Make the ScriptApiBase* accessible to ModApiBase
	lua_pushlightuserdata(m_luastack, this);
	lua_setfield(m_luastack, LUA_REGISTRYINDEX, "scriptapi");

	// If we are using LuaJIT add a C++ wrapper function to catch
	// exceptions thrown in Lua -> C++ calls
#if USE_LUAJIT
	lua_pushlightuserdata(m_luastack, (void*) script_exception_wrapper);
	luaJIT_setmode(m_luastack, -1, LUAJIT_MODE_WRAPCFUNC | LUAJIT_MODE_ON);
	lua_pop(m_luastack, 1);
#endif

	// Add basic globals
	lua_newtable(m_luastack);
	lua_setglobal(m_luastack, "core");

	lua_pushstring(m_luastack, DIR_DELIM);
	lua_setglobal(m_luastack, "DIR_DELIM");

	lua_pushstring(m_luastack, porting::getPlatformName());
	lua_setglobal(m_luastack, "PLATFORM");

	// m_secure gets set to true inside
	// ScriptApiSecurity::initializeSecurity(), if neccessary.
	// Default to false otherwise
	m_secure = false;

	m_server = NULL;
	m_environment = NULL;
	m_guiengine = NULL;
}

ScriptApiBase::~ScriptApiBase()
{
	lua_close(m_luastack);
}

bool ScriptApiBase::loadMod(const std::string &script_path,
		const std::string &mod_name, std::string *error)
{
	ModNameStorer mod_name_storer(getStack(), mod_name);

	return loadScript(script_path, error);
}

bool ScriptApiBase::loadScript(const std::string &script_path, std::string *error)
{
	verbosestream << "Loading and running script from " << script_path << std::endl;

	lua_State *L = getStack();

	bool ok;
	if (m_secure) {
		ok = ScriptApiSecurity::safeLoadFile(L, script_path.c_str());
	} else {
		ok = !luaL_loadfile(L, script_path.c_str());
	}
	ok = ok && !lua_pcall(L, 0, 0, m_errorhandler);
	if (!ok) {
		std::string error_msg = lua_tostring(L, -1);
		if (error)
			*error = error_msg;
		errorstream << "========== ERROR FROM LUA ===========" << std::endl
			<< "Failed to load and run script from " << std::endl
			<< script_path << ":" << std::endl << std::endl
			<< error_msg << std::endl << std::endl
			<< "======= END OF ERROR FROM LUA ========" << std::endl;
		lua_pop(L, 1); // Pop error message from stack
		return false;
	}
	return true;
}

void ScriptApiBase::realityCheck()
{
	int top = lua_gettop(m_luastack);