[OpenDocString] kdeconnect-kde (cpp)
kiokdeconnect.cpp
KIO::Error toKioError(const QDBusError::ErrorType type)
{
    switch (type) {
    case QDBusError::NoError:
        return KIO::Error(KJob::NoError);
    case QDBusError::NoMemory:
        return KIO::ERR_OUT_OF_MEMORY;
    case QDBusError::Timeout:
        return KIO::ERR_SERVER_TIMEOUT;
    case QDBusError::TimedOut:
        return KIO::ERR_SERVER_TIMEOUT;
    default:
        return KIO::ERR_WORKER_DEFINED;
    };
}
Converts a QDBusError object to a KIO error object. 
KioKdeconnect::KioKdeconnect(const QByteArray &pool, const QByteArray &app)
    : WorkerBase("kdeconnect", pool, app)
    , m_dbusInterface(new DaemonDbusInterface(this))
{
}
Constructs a kdeconnect object and assigns it to its internal state. 
KIO::WorkerResult KioKdeconnect::listAllDevices()
{
    infoMessage(i18n("Listing devices..."));

    // TODO: Change to all devices and show different icons for connected and disconnected?
    const QStringList devices = m_dbusInterface->devices(true, true);

    for (const QString &deviceId : devices) {
        DeviceDbusInterface interface(deviceId);

        if (!interface.hasPlugin(QStringLiteral("kdeconnect_sftp")))
            continue;

        const QString path = QStringLiteral("kdeconnect://").append(deviceId).append(QStringLiteral("/"));
        const QString name = interface.name();
        const QString icon = QStringLiteral("kdeconnect");

        KIO::UDSEntry entry;
        entry.reserve(6);
        entry.fastInsert(KIO::UDSEntry::UDS_NAME, name);
        entry.fastInsert(KIO::UDSEntry::UDS_ICON_NAME, icon);
        entry.fastInsert(KIO::UDSEntry::UDS_FILE_TYPE, QT_STAT_DIR);
        entry.fastInsert(KIO::UDSEntry::UDS_ACCESS,
                         QFileDevice::ReadOwner | QFileDevice::ExeOwner | QFileDevice::ReadGroup | QFileDevice::ExeGroup | QFileDevice::ReadOther
                             | QFileDevice::ExeOther);
        entry.fastInsert(KIO::UDSEntry::UDS_MIME_TYPE, QLatin1String(""));
        entry.fastInsert(KIO::UDSEntry::UDS_URL, path);
        listEntry(entry);
    }

    // We also need a non-null and writable UDSentry for "."
    KIO::UDSEntry entry;
    entry.reserve(4);
    entry.fastInsert(KIO::UDSEntry::UDS_NAME, QStringLiteral("."));
    entry.fastInsert(KIO::UDSEntry::UDS_FILE_TYPE, QT_STAT_DIR);
    entry.fastInsert(KIO::UDSEntry::UDS_SIZE, 0);
    entry.fastInsert(KIO::UDSEntry::UDS_ACCESS,
                     QFileDevice::ReadOwner | QFileDevice::WriteOwner | QFileDevice::ExeOwner | QFileDevice::ReadGroup | QFileDevice::WriteGroup
                         | QFileDevice::ExeGroup | QFileDevice::ReadOther | QFileDevice::ExeOther);
    listEntry(entry);

    infoMessage(QLatin1String(""));
    return KIO::WorkerResult::pass();
}
This lists all devices, which are connected and connected to each other. The function first retrieves the list of devices, and creates a UDSEntry object for each device. It also creates a file entry for the device name, icon and file type. 
KIO::WorkerResult KioKdeconnect::listDevice(const QString &device)
{
    infoMessage(i18n("Accessing device..."));

    qCDebug(KDECONNECT_KIO) << "ListDevice" << device;

    SftpDbusInterface interface(device);

    QDBusReply mountreply = interface.mountAndWait();

    if (mountreply.error().type() == QDBusError::UnknownObject) {
        DaemonDbusInterface daemon;

        auto devsRepl = daemon.devices(false, false);
        devsRepl.waitForFinished();

        if (!devsRepl.value().contains(device)) {
            return KIO::WorkerResult::fail(KIO::ERR_WORKER_DEFINED, i18n("No such device: %0").arg(device));
        }

        DeviceDbusInterface dev(device);

        if (!dev.isTrusted()) {
            return KIO::WorkerResult::fail(KIO::ERR_WORKER_DEFINED, i18n("%0 is not paired").arg(dev.name()));
        }

        if (!dev.isReachable()) {
            return KIO::WorkerResult::fail(KIO::ERR_WORKER_DEFINED, i18n("%0 is not connected").arg(dev.name()));
        }

        if (!dev.hasPlugin(QStringLiteral("kdeconnect_sftp"))) {
            return KIO::WorkerResult::fail(KIO::ERR_WORKER_DEFINED, i18n("%0 has no Remote Filesystem plugin").arg(dev.name()));
        }
    }

    if (auto result = handleDBusError(mountreply); !result.success()) {
        return result;
    }

    if (!mountreply.value()) {
        return KIO::WorkerResult::fail(KIO::ERR_WORKER_DEFINED, interface.getMountError());
    }

    QDBusReply urlreply = interface.getDirectories();

    if (auto result = handleDBusError(urlreply); !result.success()) {
        return result;
    }

    QVariantMap urls = urlreply.value();

    for (QVariantMap::iterator it = urls.begin(); it != urls.end(); ++it) {
        const QString path = it.key();
        const QString name = it.value().toString();
        const QString icon = QStringLiteral("folder");

        KIO::UDSEntry entry;
        entry.reserve(6);
        entry.fastInsert(KIO::UDSEntry::UDS_NAME, name);
        entry.fastInsert(KIO::UDSEntry::UDS_ICON_NAME, icon);
        entry.fastInsert(KIO::UDSEntry::UDS_FILE_TYPE, QT_STAT_DIR);
        entry.fastInsert(KIO::UDSEntry::UDS_ACCESS,
                         QFileDevice::ReadOwner | QFileDevice::ExeOwner | QFileDevice::ReadGroup | QFileDevice::ExeGroup | QFileDevice::ReadOther
                             | QFileDevice::ExeOther);
        entry.fastInsert(KIO::UDSEntry::UDS_MIME_TYPE, QLatin1String(""));
        entry.fastInsert(KIO::UDSEntry::UDS_URL, QUrl::fromLocalFile(path).toString());
        listEntry(entry);
    }

    // We also need a non-null and writable UDSentry for "."
    KIO::UDSEntry entry;
    entry.reserve(4);
    entry.fastInsert(KIO::UDSEntry::UDS_NAME, QStringLiteral("."));
    entry.fastInsert(KIO::UDSEntry::UDS_FILE_TYPE, QT_STAT_DIR);
    entry.fastInsert(KIO::UDSEntry::UDS_SIZE, 0);
    entry.fastInsert(KIO::UDSEntry::UDS_ACCESS,
                     QFileDevice::ReadOwner | QFileDevice::WriteOwner | QFileDevice::ExeOwner | QFileDevice::ReadGroup | QFileDevice::WriteGroup
                         | QFileDevice::ExeGroup | QFileDevice::ReadOther | QFileDevice::ExeOther);

    listEntry(entry);

    infoMessage(QLatin1String(""));
    return KIO::WorkerResult::pass();
}
This lists the devices of the given device. It first checks that the device is reachable, and if it is reachable, it constructs the directory entries, and writes the files to the appropriate UDS entries. 
KIO::WorkerResult KioKdeconnect::listDir(const QUrl &url)
{
    qCDebug(KDECONNECT_KIO) << "Listing..." << url;

    if (!m_dbusInterface->isValid()) {
        return KIO::WorkerResult::fail(KIO::Error::ERR_WORKER_DEFINED, i18n("Could not contact background service."));
    }

    QString currentDevice = url.host();

    if (currentDevice.isEmpty()) {
        return listAllDevices();
    } else {
        return listDevice(currentDevice);
    }
}
This lists the devices of the given url. It first checks that the DBus interface is valid and if it is empty, it lists all devices. 
KIO::WorkerResult KioKdeconnect::stat(const QUrl &url)
{
    qCDebug(KDECONNECT_KIO) << "Stat: " << url;

    KIO::UDSEntry entry;
    entry.fastInsert(KIO::UDSEntry::UDS_FILE_TYPE, QT_STAT_DIR);

    QString currentDevice = url.host();
    if (!currentDevice.isEmpty()) {
        SftpDbusInterface interface(currentDevice);

        if (interface.isValid()) {
            entry.fastInsert(KIO::UDSEntry::UDS_LOCAL_PATH, interface.mountPoint());

            if (!interface.isMounted()) {
                interface.mount();
            }
        }
    }

    statEntry(entry);

    return KIO::WorkerResult::pass();
}
This retrieves information about the given url, and creates an UDSEntry object. It takes the url of the file, and creates a statEntry call for each entry. 
KIO::WorkerResult KioKdeconnect::get(const QUrl &url)
{
    qCDebug(KDECONNECT_KIO) << "Get: " << url;
    mimeType(QLatin1String(""));
    return KIO::WorkerResult::pass();
}
This retrieves the content of the given url and sets the mime type to the mime type of the file.