src/script/lua_api/l_settings.cpp


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/* sha1.h

Copyright (c) 2005 Michael D. Leonhard

http://tamale.net/

Permission is hereby granted, free of charge, to any person obtaining a copy of
this software and associated documentation files (the "Software"), to deal in
the Software without restriction, including without limitation the rights to
use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
of the Software, and to permit persons to whom the Software is furnished to do
so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

*/

#ifndef SHA1_HEADER
typedef unsigned int Uint32;

class SHA1
{
	private:
		// fields
		Uint32 H0, H1, H2, H3, H4;
		unsigned char bytes[64];
		int unprocessedBytes;
		Uint32 size;
		void process();
	public:
		SHA1();
		~SHA1();
		void addBytes( const char* data, int num );
		unsigned char* getDigest();
		// utility methods
		static Uint32 lrot( Uint32 x, int bits );
		static void storeBigEndianUint32( unsigned char* byte, Uint32 num );
		static void hexPrinter( unsigned char* c, int l );
};

#define SHA1_HEADER
#endif
/*
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 "settings.h"
#include "log.h"

// 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 {
		lua_pushnil(L);
	}

	return 1;
}

// set(self, key, value)
int LuaSettings::l_set(lua_State* L)
{
	NO_MAP_LOCK_REQUIRED;
	LuaSettings* o = checkobject(L, 1);

	std::string key = std::string(luaL_checkstring(L, 2));
	const char* value = luaL_checkstring(L, 3);

	if (!o->m_settings->set(key, value))
		throw LuaError("Invalid sequence found in setting parameters");

	return 0;
}

// remove(self, key) -> success
int LuaSettings::l_remove(lua_State* L)
{
	NO_MAP_LOCK_REQUIRED;
	LuaSettings* o = checkobject(L, 1);

	std::string key = std::string(luaL_checkstring(L, 2));

	bool success = o->m_settings->remove(key);
	lua_pushboolean(L, success);

	return 1;
}

// get_names(self) -> {key1, ...}
int LuaSettings::l_get_names(lua_State* L)
{
	NO_MAP_LOCK_REQUIRED;
	LuaSettings* o = checkobject(L, 1);

	std::vector<std::string> keys = o->m_settings->getNames();

	lua_newtable(L);
	for (unsigned int i=0; i < keys.size(); i++)
	{
		lua_pushstring(L, keys[i].c_str());
		lua_rawseti(L, -2, i + 1);
	}

	return 1;
}

// write(self) -> success
int LuaSettings::l_write(lua_State* L)
{
	NO_MAP_LOCK_REQUIRED;
	LuaSettings* o = checkobject(L, 1);

	if (!o->m_write_allowed) {
		throw LuaError("Settings: writing " + o->m_filename +
				" not allowed with mod security on.");
	}

	bool success = o->m_settings->updateConfigFile(o->m_filename.c_str());
	lua_pushboolean(L, success);

	return 1;
}

// to_table(self) -> {[key1]=value1,...}
int LuaSettings::l_to_table(lua_State* L)
{
	NO_MAP_LOCK_REQUIRED;
	LuaSettings* o = checkobject(L, 1);

	std::vector<std::string> keys = o->m_settings->getNames();

	lua_newtable(L);
	for (unsigned int i=0; i < keys.size(); i++)
	{
		lua_pushstring(L, o->m_settings->get(keys[i]).c_str());
		lua_setfield(L, -2, keys[i].c_str());
	}

	return 1;
}

LuaSettings::LuaSettings(const char* filename, bool write_allowed)
{
	m_write_allowed = write_allowed;
	m_filename = std::string(filename);

	m_settings = new Settings();
	m_settings->readConfigFile(m_filename.c_str());
}

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

void LuaSettings::Register(lua_State* L)
{
	lua_newtable(L);
	int methodtable = lua_gettop(L);
	luaL_newmetatable(L, className);
	int metatable = lua_gettop(L);

	lua_pushliteral(L, "__metatable");
	lua_pushvalue(L, methodtable);
	lua_settable(L, metatable);  // hide metatable from Lua getmetatable()

	lua_pushliteral(L, "__index");
	lua_pushvalue(L, methodtable);
	lua_settable(L, metatable);

	lua_pushliteral(L, "__gc");
	lua_pushcfunction(L, gc_object);
	lua_settable(L, metatable);

	lua_pop(L, 1);  // drop metatable

	luaL_openlib(L, 0, methods, 0);  // fill methodtable
	lua_pop(L, 1);  // drop methodtable

	// Can be created from Lua (Settings(filename))
	lua_register(L, className, create_object);
}

// LuaSettings(filename)
// Creates an LuaSettings and leaves it on top of stack
int LuaSettings::create_object(lua_State* L)
{
	NO_MAP_LOCK_REQUIRED;
	bool write_allowed = true;
	const char* filename = luaL_checkstring(L, 1);
	CHECK_SECURE_PATH_POSSIBLE_WRITE(L, filename, &write_allowed);
	LuaSettings* o = new LuaSettings(filename, write_allowed);
	*(void **)(lua_newuserdata(L, sizeof(void *))) = o;
	luaL_getmetatable(L, className);
	lua_setmetatable(L, -2);
	return 1;
}

LuaSettings* LuaSettings::checkobject(lua_State* L, int narg)
{
	NO_MAP_LOCK_REQUIRED;
	luaL_checktype(L, narg, LUA_TUSERDATA);
	void *ud = luaL_checkudata(L, narg, className);
	if(!ud) luaL_typerror(L, narg, className);
	return *(LuaSettings**)ud;  // unbox pointer
}

const char LuaSettings::className[] = "Settings";
const luaL_reg LuaSettings::methods[] = {
	luamethod(LuaSettings, get),
	luamethod(LuaSettings, get_bool),
	luamethod(LuaSettings, set),
	luamethod(LuaSettings, remove),
	luamethod(LuaSettings, get_names),
	luamethod(LuaSettings, write),
	luamethod(LuaSettings, to_table),
	{0,0}
};