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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 "lua_api/l_internal.h"
#include "common/c_converter.h"
#include "common/c_content.h"
#include "lua_api/l_http.h"
#include "httpfetch.h"
#include "settings.h"
#include "debug.h"
#include "log.h"
#include <algorithm>
#include <iomanip>
#include <cctype>
#define HTTP_API(name) \
lua_pushstring(L, #name); \
lua_pushcfunction(L, l_http_##name); \
lua_settable(L, -3);
#if USE_CURL
void ModApiHttp::read_http_fetch_request(lua_State *L, HTTPFetchRequest &req)
{
luaL_checktype(L, 1, LUA_TTABLE);
req.caller = httpfetch_caller_alloc_secure();
getstringfield(L, 1, "url", req.url);
lua_getfield(L, 1, "user_agent");
if (lua_isstring(L, -1))
req.useragent = getstringfield_default(L, 1, "user_agent", "");
lua_pop(L, 1);
req.multipart = getboolfield_default(L, 1, "multipart", false);
req.timeout = getintfield_default(L, 1, "timeout", 3) * 1000;
// post_data: if table, post form data, otherwise raw data
lua_getfield(L, 1, "post_data");
if (lua_istable(L, 2)) {
lua_pushnil(L);
while (lua_next(L, 2) != 0)
{
req.post_fields[luaL_checkstring(L, -2)] = luaL_checkstring(L, -1);
lua_pop(L, 1);
}
} else if (lua_isstring(L, 2)) {
req.post_data = lua_tostring(L, 2);
}
lua_pop(L, 1);
lua_getfield(L, 1, "extra_headers");
if (lua_istable(L, 2)) {
lua_pushnil(L);
while (lua_next(L, 2) != 0)
{
const char *header = luaL_checkstring(L, -1);
req.extra_headers.push_back(header);
lua_pop(L, 1);
}
}
lua_pop(L, 1);
}
void ModApiHttp::push_http_fetch_result(lua_State *L, HTTPFetchResult &res, bool completed)
{
lua_newtable(L);
setboolfield(L, -1, "succeeded", res.succeeded);
setboolfield(L, -1, "timeout", res.timeout);
setboolfield(L, -1, "completed", completed);
setintfield(L, -1, "code", res.response_code);
setstringfield(L, -1, "data", res.data.c_str());
}
// http_api.fetch_async(HTTPRequest definition)
int ModApiHttp::l_http_fetch_async(lua_State *L)
{
NO_MAP_LOCK_REQUIRED;
HTTPFetchRequest req;
read_http_fetch_request(L, req);
actionstream << "Mod performs HTTP request with URL " << req.url << std::endl;
httpfetch_async(req);
// Convert handle to hex string since lua can't handle 64-bit integers
std::stringstream handle_conversion_stream;
handle_conversion_stream << std::hex << req.caller;
std::string caller_handle(handle_conversion_stream.str());
lua_pushstring(L, caller_handle.c_str());
return 1;
}
// http_api.fetch_async_get(handle)
int ModApiHttp::l_http_fetch_async_get(lua_State *L)
{
NO_MAP_LOCK_REQUIRED;
std::string handle_str = luaL_checkstring(L, 1);
// Convert hex string back to 64-bit handle
u64 handle;
std::stringstream handle_conversion_stream;
handle_conversion_stream << std::hex << handle_str;
handle_conversion_stream >> handle;
HTTPFetchResult res;
bool completed = httpfetch_async_get(handle, res);
push_http_fetch_result(L, res, completed);
return 1;
}
int ModApiHttp::l_request_http_api(lua_State *L)
{
NO_MAP_LOCK_REQUIRED;
// We have to make sure that this function is being called directly by
// a mod, otherwise a malicious mod could override this function and
// steal its return value.
lua_Debug info;
// Make sure there's only one item below this function on the stack...
if (lua_getstack(L, 2, &info)) {
return 0;
}
FATAL_ERROR_IF(!lua_getstack(L, 1, &info), "lua_getstack() failed");
FATAL_ERROR_IF(!lua_getinfo(L, "S", &info), "lua_getinfo() failed");
// ...and that that item is the main file scope.
if (strcmp(info.what, "main") != 0) {
return 0;
}
// Mod must be listed in secure.http_mods or secure.trusted_mods
lua_rawgeti(L, LUA_REGISTRYINDEX, CUSTOM_RIDX_CURRENT_MOD_NAME);
if (!lua_isstring(L, -1)) {
return 0;
}
const char *mod_name = lua_tostring(L, -1);
std::string http_mods = g_settings->get("secure.http_mods");
http_mods.erase(std::remove(http_mods.begin(), http_mods.end(), ' '), http_mods.end());
std::vector<std::string> mod_list_http = str_split(http_mods, ',');
std::string trusted_mods = g_settings->get("secure.trusted_mods");
trusted_mods.erase(std::remove(trusted_mods.begin(), trusted_mods.end(), ' '), trusted_mods.end());
std::vector<std::string> mod_list_trusted = str_split(trusted_mods, ',');
mod_list_http.insert(mod_list_http.end(), mod_list_trusted.begin(), mod_list_trusted.end());
if (std::find(mod_list_http.begin(), mod_list_http.end(), mod_name) == mod_list_http.end()) {
lua_pushnil(L);
return 1;
}
lua_getglobal(L, "core");
lua_getfield(L, -1, "http_add_fetch");
lua_newtable(L);
HTTP_API(fetch_async);
HTTP_API(fetch_async_get);
// Stack now looks like this:
// <core.http_add_fetch> <table with fetch_async, fetch_async_get>
// Now call core.http_add_fetch to append .fetch(request, callback) to table
lua_call(L, 1, 1);
return 1;
}
#endif
void ModApiHttp::Initialize(lua_State *L, int top)
{
#if USE_CURL
API_FCT(request_http_api);
#endif
}
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