minetest/src/script/cpp_api/s_server.cpp

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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_server.h"
#include "cpp_api/s_internal.h"
#include "common/c_converter.h"
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#include "util/numeric.h" // myrand
bool ScriptApiServer::getAuth(const std::string &playername,
std::string *dst_password,
std::set<std::string> *dst_privs,
s64 *dst_last_login)
{
SCRIPTAPI_PRECHECKHEADER
int error_handler = PUSH_ERROR_HANDLER(L);
getAuthHandler();
lua_getfield(L, -1, "get_auth");
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if (lua_type(L, -1) != LUA_TFUNCTION)
throw LuaError("Authentication handler missing get_auth");
lua_pushstring(L, playername.c_str());
PCALL_RES(lua_pcall(L, 1, 1, error_handler));
lua_remove(L, -2); // Remove auth handler
lua_remove(L, error_handler);
// nil = login not allowed
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if (lua_isnil(L, -1))
return false;
luaL_checktype(L, -1, LUA_TTABLE);
std::string password;
if (!getstringfield(L, -1, "password", password))
throw LuaError("Authentication handler didn't return password");
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if (dst_password)
*dst_password = password;
lua_getfield(L, -1, "privileges");
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if (!lua_istable(L, -1))
throw LuaError("Authentication handler didn't return privilege table");
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if (dst_privs)
readPrivileges(-1, *dst_privs);
lua_pop(L, 1); // Remove key from privs table
s64 last_login;
if(!getintfield(L, -1, "last_login", last_login))
throw LuaError("Authentication handler didn't return last_login");
if (dst_last_login)
*dst_last_login = (s64)last_login;
return true;
}
void ScriptApiServer::getAuthHandler()
{
lua_State *L = getStack();
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lua_getglobal(L, "core");
lua_getfield(L, -1, "registered_auth_handler");
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if (lua_isnil(L, -1)){
lua_pop(L, 1);
lua_getfield(L, -1, "builtin_auth_handler");
}
setOriginFromTable(-1);
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lua_remove(L, -2); // Remove core
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if (lua_type(L, -1) != LUA_TTABLE)
throw LuaError("Authentication handler table not valid");
}
void ScriptApiServer::readPrivileges(int index, std::set<std::string> &result)
{
lua_State *L = getStack();
result.clear();
lua_pushnil(L);
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if (index < 0)
index -= 1;
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while (lua_next(L, index) != 0) {
// key at index -2 and value at index -1
std::string key = luaL_checkstring(L, -2);
bool value = readParam<bool>(L, -1);
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if (value)
result.insert(key);
// removes value, keeps key for next iteration
lua_pop(L, 1);
}
}
void ScriptApiServer::createAuth(const std::string &playername,
const std::string &password)
{
SCRIPTAPI_PRECHECKHEADER
int error_handler = PUSH_ERROR_HANDLER(L);
getAuthHandler();
lua_getfield(L, -1, "create_auth");
lua_remove(L, -2); // Remove auth handler
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if (lua_type(L, -1) != LUA_TFUNCTION)
throw LuaError("Authentication handler missing create_auth");
lua_pushstring(L, playername.c_str());
lua_pushstring(L, password.c_str());
PCALL_RES(lua_pcall(L, 2, 0, error_handler));
lua_pop(L, 1); // Pop error handler
}
bool ScriptApiServer::setPassword(const std::string &playername,
const std::string &password)
{
SCRIPTAPI_PRECHECKHEADER
int error_handler = PUSH_ERROR_HANDLER(L);
getAuthHandler();
lua_getfield(L, -1, "set_password");
lua_remove(L, -2); // Remove auth handler
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if (lua_type(L, -1) != LUA_TFUNCTION)
throw LuaError("Authentication handler missing set_password");
lua_pushstring(L, playername.c_str());
lua_pushstring(L, password.c_str());
PCALL_RES(lua_pcall(L, 2, 1, error_handler));
lua_remove(L, error_handler);
return lua_toboolean(L, -1);
}
bool ScriptApiServer::on_chat_message(const std::string &name,
const std::string &message)
{
SCRIPTAPI_PRECHECKHEADER
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// Get core.registered_on_chat_messages
lua_getglobal(L, "core");
lua_getfield(L, -1, "registered_on_chat_messages");
// Call callbacks
lua_pushstring(L, name.c_str());
lua_pushstring(L, message.c_str());
runCallbacks(2, RUN_CALLBACKS_MODE_OR_SC);
return readParam<bool>(L, -1);
}
void ScriptApiServer::on_mods_loaded()
{
SCRIPTAPI_PRECHECKHEADER
// Get registered shutdown hooks
lua_getglobal(L, "core");
lua_getfield(L, -1, "registered_on_mods_loaded");
// Call callbacks
runCallbacks(0, RUN_CALLBACKS_MODE_FIRST);
}
void ScriptApiServer::on_shutdown()
{
SCRIPTAPI_PRECHECKHEADER
// Get registered shutdown hooks
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lua_getglobal(L, "core");
lua_getfield(L, -1, "registered_on_shutdown");
// Call callbacks
runCallbacks(0, RUN_CALLBACKS_MODE_FIRST);
}
std::string ScriptApiServer::formatChatMessage(const std::string &name,
const std::string &message)
{
SCRIPTAPI_PRECHECKHEADER
// Push function onto stack
lua_getglobal(L, "core");
lua_getfield(L, -1, "format_chat_message");
// Push arguments onto stack
lua_pushstring(L, name.c_str());
lua_pushstring(L, message.c_str());
// Actually call the function
lua_call(L, 2, 1);
// Fetch return value
std::string ret = lua_tostring(L, -1);
lua_pop(L, 1);
return ret;
}
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u32 ScriptApiServer::allocateDynamicMediaCallback(int f_idx)
{
lua_State *L = getStack();
if (f_idx < 0)
f_idx = lua_gettop(L) + f_idx + 1;
lua_getglobal(L, "core");
lua_getfield(L, -1, "dynamic_media_callbacks");
luaL_checktype(L, -1, LUA_TTABLE);
// Find a randomly generated token that doesn't exist yet
int tries = 100;
u32 token;
while (1) {
token = myrand();
lua_rawgeti(L, -2, token);
bool is_free = lua_isnil(L, -1);
lua_pop(L, 1);
if (is_free)
break;
if (--tries < 0)
FATAL_ERROR("Ran out of callbacks IDs?!");
}
// core.dynamic_media_callbacks[token] = callback_func
lua_pushvalue(L, f_idx);
lua_rawseti(L, -2, token);
lua_pop(L, 2);
verbosestream << "allocateDynamicMediaCallback() = " << token << std::endl;
return token;
}
void ScriptApiServer::freeDynamicMediaCallback(u32 token)
{
lua_State *L = getStack();
verbosestream << "freeDynamicMediaCallback(" << token << ")" << std::endl;
// core.dynamic_media_callbacks[token] = nil
lua_getglobal(L, "core");
lua_getfield(L, -1, "dynamic_media_callbacks");
luaL_checktype(L, -1, LUA_TTABLE);
lua_pushnil(L);
lua_rawseti(L, -2, token);
lua_pop(L, 2);
}
void ScriptApiServer::on_dynamic_media_added(u32 token, const char *playername)
{
SCRIPTAPI_PRECHECKHEADER
int error_handler = PUSH_ERROR_HANDLER(L);
lua_getglobal(L, "core");
lua_getfield(L, -1, "dynamic_media_callbacks");
luaL_checktype(L, -1, LUA_TTABLE);
lua_rawgeti(L, -1, token);
luaL_checktype(L, -1, LUA_TFUNCTION);
lua_pushstring(L, playername);
PCALL_RES(lua_pcall(L, 1, 0, error_handler));
}