bool get_cache_expiration_time()

in src/dcap_provider.cpp [341:387]

• 46 lines of code
• 5 McCabe index (conditional complexity)

bool get_cache_expiration_time(const string& cache_control, const string& url, time_t& expiration_time)
{
    time_t max_age = 0;
    tm* max_age_s = localtime(&max_age);
    size_t index = cache_control.find(CACHE_CONTROL_MAX_AGE);
    int cache_time_seconds = 0;
    constexpr int MAX_CACHE_TIME_SECONDS = 86400;
    if (index != string::npos)
    {
        try
        {
            cache_time_seconds = stoi(cache_control.substr(index + CACHE_CONTROL_MAX_AGE.length()));
            if (cache_time_seconds > MAX_CACHE_TIME_SECONDS)
            {
                log(SGX_QL_LOG_ERROR,
                    "Caching control '%d' larger than maximum '%d' seconds. Collateral will not be cached",
                    cache_time_seconds,
                    MAX_CACHE_TIME_SECONDS);
                return false;
            }
        }
        catch (const std::invalid_argument& e)
        {
            log(SGX_QL_LOG_ERROR,
                "Invalid argument thrown when parsing cache-control. Header text: '%s' Error: '%s'. Collateral will not be cached",
                cache_control.c_str(),
                e.what());
            return false;
        }
        catch (const std::out_of_range& e)
        {
            log(SGX_QL_LOG_ERROR,
                "Invalid argument thrown when parsing cache-control. Header text: '%s' Error: '%s'. Collateral will not be cached",
                cache_control.c_str(),
                e.what());
            return false;
        }
    }

    max_age_s->tm_sec += cache_time_seconds;
    expiration_time = time(nullptr) + mktime(max_age_s);
    log(SGX_QL_LOG_INFO,
        "Caching collateral '%s' for '%d' seconds",
        url.c_str(),
        cache_time_seconds);
    return true;
}