[Server] Add sandboxed import() function

apps/openmw-mp/Script/luaUtils.cpp

@@ -21,6 +21,16 @@ sol::table str_split(const std::string &str, const sol::object &sepObj, sol::thi
     return tbl;
 }
 
+sol::object import(const std::string &name, sol::this_state ts, sol::this_environment te)
+{
+    sol::state_view state(ts);
+    sol::environment env(te);
+
+    sol::function res = state.load_file(name);
+    sol::set_environment(env, res);
+    return res.call();
+}
+
 void LuaUtils::Init(LuaState &lua)
 {
     sol::table strTable = (*lua.getState())["string"];
@@ -28,4 +38,5 @@ void LuaUtils::Init(LuaState &lua)
         throw std::runtime_error("string library not initialized");
 
     strTable.set_function("split", &str_split);
+    lua.getState()->set_function("import", &import);
 }