Password manager tools like Keepassx offer an option to clear
the clipboard/selection after some time, e.g. 10 seconds,
after the password was copied to the clipboard. This works fine,
but unfortunately the password isn't removed from Klipper's
history. This is a great security risk, which may make the use
of password managers impossible.
This patch changes Klipper::applyClipChanges(const QMimeData* clipData)
where clipboard data is inserted into history. If the data has an
additional mime type 'x-kde-passwordManagerHint', it is not inserted
into history.
For this to work as designed, password managers should add the
additional mime type 'x-kde-passwordManagerHint' to the mimeData
like following when copying a password to the clipboard:
QMimeData* mimeDataClipboard = new QMimeData();
const QString secretStr = "secret";
QByteArray secretBa = secretStr.toUtf8();
mimeDataClipboard->setText(password); // this is the password to copy
mimeDataClipboard->setData("x-kde-passwordManagerHint", secretBa);
clipboard->setMimeData(mimeDataClipboard, QClipboard::Clipboard);
if (clipboard->supportsSelection()) {
// we cannot use the same QMimedata, it's already owned by clipboard
QMimeData* mimeDataSelection = new QMimeData();
mimeDataSelection->setText(password); // this is the password to copy
mimeDataSelection->setData("x-kde-passwordManagerHint", secretBa);
clipboard->setMimeData(mimeDataSelection, QClipboard::Selection);
}