Add Lua interface to HTTPFetchRequest

This allows mods to perform both asynchronous and synchronous HTTP
requests. Mods are only granted access to HTTP APIs if either mod
security is disabled or if they are whitelisted in any of the
the secure.http_mods and secure.trusted_mods settings.

Adds httpfetch_caller_alloc_secure to generate random, non-predictable
caller IDs so that lua mods cannot spy on each others HTTP queries.

src/script/common/c_converter.cpp

@@ -517,6 +517,15 @@ bool getboolfield_default(lua_State *L, int table,
 	return result;
 }
 
+void setstringfield(lua_State *L, int table,
+		const char *fieldname, const char *value)
+{
+	lua_pushstring(L, value);
+	if(table < 0)
+		table -= 1;
+	lua_setfield(L, table, fieldname);
+}
+
 void setintfield(lua_State *L, int table,
 		const char *fieldname, int value)
 {

src/script/common/c_converter.h

@@ -69,6 +69,8 @@ bool               getfloatfield(lua_State *L, int table,
 std::string        checkstringfield(lua_State *L, int table,
                              const char *fieldname);
 
+void               setstringfield(lua_State *L, int table,
+                             const char *fieldname, const char *value);
 void               setintfield(lua_State *L, int table,
                              const char *fieldname, int value);
 void               setfloatfield(lua_State *L, int table,

src/script/lua_api/CMakeLists.txt

@@ -16,6 +16,7 @@ set(common_SCRIPT_LUA_API_SRCS
 	${CMAKE_CURRENT_SOURCE_DIR}/l_util.cpp
 	${CMAKE_CURRENT_SOURCE_DIR}/l_vmanip.cpp
 	${CMAKE_CURRENT_SOURCE_DIR}/l_settings.cpp
+	${CMAKE_CURRENT_SOURCE_DIR}/l_http.cpp
 	PARENT_SCOPE)
 
 set(client_SCRIPT_LUA_API_SRCS

src/script/lua_api/l_http.cpp

@@ -0,0 +1,176 @@
+/*
+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 "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;
+
+	// 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)) {
+		lua_pushnil(L);
+		return 1;
+	}
+
+	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
+}

src/script/lua_api/l_http.h

@@ -0,0 +1,50 @@
+/*
+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.
+*/
+
+#ifndef L_HTTP_H_
+#define L_HTTP_H_
+
+#include "lua_api/l_base.h"
+#include "config.h"
+
+struct HTTPFetchRequest;
+struct HTTPFetchResult;
+
+class ModApiHttp : public ModApiBase {
+private:
+#if USE_CURL
+	// Helpers for HTTP fetch functions
+	static void read_http_fetch_request(lua_State *L, HTTPFetchRequest &req);
+	static void push_http_fetch_result(lua_State *L, HTTPFetchResult &res, bool completed = true);
+
+	// http_fetch_async({url=, timeout=, post_data=})
+	static int l_http_fetch_async(lua_State *L);
+
+	// http_fetch_async_get(handle)
+	static int l_http_fetch_async_get(lua_State *L);
+
+	// request_http_api()
+	static int l_request_http_api(lua_State *L);
+#endif
+
+public:
+	static void Initialize(lua_State *L, int top);
+};
+
+#endif /* L_HTTP_H_ */

src/script/scripting_game.cpp

@@ -39,6 +39,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "lua_api/l_util.h"
 #include "lua_api/l_vmanip.h"
 #include "lua_api/l_settings.h"
+#include "lua_api/l_http.h"
 
 extern "C" {
 #include "lualib.h"
@@ -89,6 +90,7 @@ void GameScripting::InitializeModApi(lua_State *L, int top)
 	ModApiRollback::Initialize(L, top);
 	ModApiServer::Initialize(L, top);
 	ModApiUtil::Initialize(L, top);
+	ModApiHttp::Initialize(L, top);
 
 	// Register reference classes (userdata)
 	InvRef::Register(L);