minetest.git - modified minetest for gpcfs purposes

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Diffstat (limited to 'src/map_settings_manager.cpp')

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/*
Minetest
Copyright (C) 2013 PilzAdam <pilzadam@minetest.net>

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 "lua_api/l_settings.h"
#include "lua_api/l_internal.h"
#include "cpp_api/s_security.h"
#include "threading/mutex_auto_lock.h"
#include "util/string.h" // FlagDesc
#include "settings.h"
#include "noise.h"
#include "log.h"


/* This protects:
 * 'secure.*' settings from being set
 * some mapgen settings from being set
 *   (not security-criticial, just to avoid messing up user configs)
 */
#define CHECK_SETTING_SECURITY(L, name) \
	if (o->m_settings == g_settings) { \
		if (checkSettingSecurity(L, name) == -1) \
			return 0; \
	}

static inline int checkSettingSecurity(lua_State* L, const std::string &name)
{
	if (ScriptApiSecurity::isSecure(L) && name.compare(0, 7, "secure.") == 0)
		throw LuaError("Attempt to set secure setting.");

	bool is_mainmenu = false;
#ifndef SERVER
	is_mainmenu = ModApiBase::getGuiEngine(L) != nullptr;
#endif
	if (!is_mainmenu && (name == "mg_name" || name == "mg_flags")) {
		errorstream << "Tried to set global setting " << name << ", ignoring. "
			"minetest.set_mapgen_setting() should be used instead." << std::endl;
		infostream << script_get_backtrace(L) << std::endl;
		return -1;
	}

	return 0;
}

LuaSettings::LuaSettings(Settings *settings, const std::string &filename) :
	m_settings(settings),
	m_filename(filename)
{
}

LuaSettings::LuaSettings(const std::string &filename, bool write_allowed) :
	m_filename(filename),
	m_is_own_settings(true),
	m_write_allowed(write_allowed)
{
	m_settings = new Settings();
	m_settings->readConfigFile(filename.c_str());
}

LuaSettings::~LuaSettings()
{
	if (m_is_own_settings)
		delete m_settings;
}


void LuaSettings::create(lua_State *L, Settings *settings,
		const std::string &filename)
{
	LuaSettings *o = new LuaSettings(settings, filename);
	*(void **)(lua_newuserdata(L, sizeof(void *))) = o;
	luaL_getmetatable(L, className);
	lua_setmetatable(L, -2);
}


// garbage collector
int LuaSettings::gc_object(lua_State* L)
{
	LuaSettings* o = *(LuaSettings **)(lua_touserdata(L, 1));
	delete o;
	return 0;
}


// get(self, key) -> value
int LuaSettings::l_get(lua_State* L)
{
	NO_MAP_LOCK_REQUIRED;
	LuaSettings* o = checkobject(L, 1);

	std::string key = std::string(luaL_checkstring(L, 2));
	if (o->m_settings->exists(key)) {
		std::string value = o->m_settings->get(key);
		lua_pushstring(L, value.c_str());
	} else {
		lua_pushnil(L);
	}

	return 1;
}

// get_bool(self, key) -> boolean
int LuaSettings::l_get_bool(lua_State* L)
{
	NO_MAP_LOCK_REQUIRED;
	LuaSettings* o = checkobject(L, 1);

	std::string key = std::string(luaL_checkstring(L, 2));
	if (o->m_settings->exists(key)) {
		bool value = o->m_settings->getBool(key);
		lua_pushboolean(L, value);
	} else {
		// Push default value
		if (lua_isboolean(L, 3))
			lua_pushboolean(L, readParam<bool>(L, 3));
		else
			lua_pushnil(L);
	}

	return 1;
}

// get_np_group(self, key) -> value
int LuaSettings::l_get_np_group(lua_State *L)
{
	NO_MAP_LOCK_REQUIRED;
	LuaSettings *o = checkobject(L, 1);

	std::string key = std::string(luaL_checkstring(L, 2));
	if (o->m_settings->exists(key)) {
		NoiseParams np;
		o->m_settings->getNoiseParams(key, np);
		push_noiseparams(L, &np);
	} else {
		lua_pushnil(L);
	}

	return 1;
}

// get_flags(self, key) -> table or nil
int LuaSettings::l_get_flags(lua_State *L)
{
	NO_MAP_LOCK_REQUIRED;
	LuaSettings *o = checkobject(L, 1);
	std::string key = std::string(luaL_checkstring(L, 2));

	u32 flags = 0;
	auto flagdesc = o->m_settings->getFlagDescFallback(key);
	if (o->m_settings->getFlagStrNoEx(key, flags, flagdesc)) {
		lua_newtable(L);
		int table = lua_gettop(L);
		for (size_t i = 0; flagdesc[i].name; ++i) {
			lua_pushboolean(L, flags & flagdesc[i].flag);
			lua_setfield(L, table, flagdesc[i].name);
		}
		lua_pushvalue(L, table);
	} else {
		lua_pushnil(L);
	}

	return 1;
}

// set(self, key, value)


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