Method resolveEntry

launcher/net/HttpMetaCache.cpp:85–142

}

auto HttpMetaCache::resolveEntry(QString base, QString resource_path, QString expected_etag) -> MetaEntryPtr
{
    resource_path = FS::RemoveInvalidPathChars(resource_path);
    auto entry = getEntry(base, resource_path);
    // it's not present? generate a default stale entry
    if (!entry) {
        return staleEntry(base, resource_path);
    }

    auto& selected_base = m_entries[base];
    QString real_path = FS::PathCombine(selected_base.base_path, resource_path);
    QFileInfo finfo(real_path);

    // is the file really there? if not -> stale
    if (!finfo.isFile() || !finfo.isReadable()) {
        // if the file doesn't exist, we disown the entry
        selected_base.entry_list.remove(resource_path);
        return staleEntry(base, resource_path);
    }

    if (!expected_etag.isEmpty() && expected_etag != entry->m_etag) {
        // if the etag doesn't match expected, we disown the entry
        selected_base.entry_list.remove(resource_path);
        return staleEntry(base, resource_path);
    }

    // if the file changed, check md5sum
    qint64 file_last_changed = finfo.lastModified().toUTC().toMSecsSinceEpoch();
    if (file_last_changed != entry->m_local_changed_timestamp) {
        QFile input(real_path);
        if (!input.open(QIODevice::ReadOnly)) {
            qWarning() << "Failed to open file" << input.fileName() << "for reading:" << input.errorString();
            return staleEntry(base, resource_path);
        }
        QString md5sum = QCryptographicHash::hash(input.readAll(), QCryptographicHash::Md5).toHex().constData();
        if (entry->m_md5sum != md5sum) {
            selected_base.entry_list.remove(resource_path);
            return staleEntry(base, resource_path);
        }

        // md5sums matched... keep entry and save the new state to file
        entry->m_local_changed_timestamp = file_last_changed;
        SaveEventually();
    }

    // Get rid of old entries, to prevent cache problems
    auto current_time = QDateTime::currentSecsSinceEpoch();
    if (entry->isExpired(current_time - (file_last_changed / 1000))) {
        qCWarning(taskNetLogC) << "[HttpMetaCache]"
                               << "Removing cache entry because of old age!";
        selected_base.entry_list.remove(resource_path);
        return staleEntry(base, resource_path);
    }

    // entry passed all the checks we cared about.
    entry->m_basePath = getBasePath(base);
    return entry;
}