e = MAX_GETPW_R_BUF_SIZE;
++    }
++
++    for (const auto& [uid, groups] : usersGroups)
++    {
++        nlohmann::json groupNames = nlohmann::json::array();
++
++        for (const auto& gid : groups)
++        {
++            struct group grp;
++            struct group* grpResult = nullptr;
++            auto groupBuf = std::make_unique<char[]>(bufSize);
++
++            if (m_groupWrapper->getgrgid_r(gid, &grp, groupBuf.get(), bufSize, &grpResult) == 0 && grpResult != nullptr)
++            {
++                groupNames.push_back(grpResult->gr_name);
++            }
++        }
++
++        if (singleUid)
++        {
++            result = groupNames;
++        }
++        else
++        {
++            result[std::to_string(uid)] = groupNames;
++        }
++    }
++
++    return result;
++}
++
++nlohmann::json UserGroupsProvider::getUserNamesByGid(const std::set<gid_t>& gids)
++{
++    const bool allGroups = gids.empty();
++    const bool singleGid = (!allGroups && gids.size() == 1);
++    nlohmann::json result = singleGid ? nlohmann::json::array() : nlohmann::json::object();
++
++    size_t bufSize = sysconf(_SC_GETPW_R_SIZE_MAX);
++
++    if (bufSize > MAX_GETPW_R_BUF_SIZE)
++    {
++        bufSize = MAX_GETPW_R_BUF_SIZE;
++    }
++
++    std::map<gid_t, std::set<std::string>> gidToUsernames;
++
++    if (allGroups)
++    {
++        struct group* grp = nullptr;
++        m_groupWrapper->setgrent();
++
++        while ((grp = m_groupWrapper->getgrent()) != nullptr)
++        {
++            gid_t gid = grp->gr_gid;
++            char** members = grp->gr_mem;
++
++            while (members && *members)
++            {
++                gidToUsernames[gid].insert(*members);
++                ++members;
++            }
++        }
++
++        m_groupWrapper->endgrent();
++    }
++    else
++    {
++        for (const auto& gid : gids)
++        {
++            struct group grp;
++            struct group* grpResult = nullptr;
++            auto groupBuf = std::make_unique<char[]>(bufSize);
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