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pinentrydialog.cpp
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	/* pinentrydialog.cpp - A (not yet) secure Qt 4 dialog for PIN entry.
	* Copyright (C) 2002, 2008 Klarälvdalens Datakonsult AB (KDAB)
	* Copyright 2007 Ingo Klöcker
	* Copyright 2016 Intevation GmbH
	*
	* Written by Steffen Hansen <steffen@klaralvdalens-datakonsult.se>.
	* Modified by Andre Heinecke <aheinecke@intevation.de>
	*
	* This program is free software; you can redistribute it and/or
	* modify it under the terms of the GNU General Public License as
	* published by the Free Software Foundation; either version 2 of the
	* License, or (at your option) any later version.
	*
	* This program is distributed in the hope that it will be useful, but
	* WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	* General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, see <https://www.gnu.org/licenses/>.
	* SPDX-License-Identifier: GPL-2.0+
	*/

	#include "pinentrydialog.h"
	#include <QGridLayout>

	#include <QProgressBar>
	#include <QApplication>
	#include <QStyle>
	#include <QPainter>
	#include <QPushButton>
	#include <QDialogButtonBox>
	#include <QKeyEvent>
	#include <QLabel>
	#include <QPalette>
	#include <QLineEdit>
	#include <QAction>
	#include <QCheckBox>

	#ifdef Q_OS_WIN
	#include <windows.h>
	#endif

	/* I [wk] have no idea for what this code was supposed to do.
	Foregrounding a window is heavily restricted by modern Windows
	versions. This is the reason why gpg-agent employs its
	AllowSetForegroundWindow callback machinery to ask the supposed to
	be be calling process to allow a pinentry to go into the
	foreground.

	[ah] This is a Hack to workaround the fact that Foregrounding
	a Window is so restricted that it AllowSetForegroundWindow
	does not always work (e.g. when the ForegroundWindow timeout
	has not expired.

	[ah 2018-03-05] Disabled this again in favor of using
	windows stays on top hint. The code that is in main
	setup_foreground_window. Additionally the setFocus
	now works because it is posted after the window is shown
	and our raise window also activates the pinentry window.
	*/
	#if 0
	WINBOOL SetForegroundWindowEx(HWND hWnd)
	{
	//Attach foreground window thread to our thread
	const DWORD ForeGroundID = GetWindowThreadProcessId(::GetForegroundWindow(), NULL);
	const DWORD CurrentID = GetCurrentThreadId();
	WINBOOL retval;

	AttachThreadInput(ForeGroundID, CurrentID, TRUE);
	//Do our stuff here
	HWND hLastActivePopupWnd = GetLastActivePopup(hWnd);
	retval = SetForegroundWindow(hLastActivePopupWnd);

	//Detach the attached thread
	AttachThreadInput(ForeGroundID, CurrentID, FALSE);
	return retval;
	}// End SetForegroundWindowEx
	#endif

	void raiseWindow(QWidget *w)
	{
	w->activateWindow();
	w->raise();
	#if 0
	HWND wid = (HWND)w->effectiveWinId();
	/* In the meantime we do our own attention grabbing */
	if (!SetForegroundWindow(wid) && !SetForegroundWindowEx(wid)) {
	OutputDebugString("SetForegroundWindow (ex) failed");
	/* Yet another fallback which will not work on some
	* versions and is not recommended by msdn */
	if (!ShowWindow(wid, SW_SHOWNORMAL)) {
	OutputDebugString("ShowWindow failed.");
	}
	}
	/* Even if SetForgeoundWindow / SetForegroundWinowEx don't fail
	* we sometimes are still not in the foreground. So we try yet
	* another hack by using SetWindowPos */
	if (!SetWindowPos(wid, HWND_TOPMOST, 0, 0, 0, 0,
	SWP_NOMOVE \| SWP_NOSIZE \| SWP_SHOWWINDOW)) {
	OutputDebugString("SetWindowPos failed.");
	} else {
	/* Without moving back to NOTOPMOST we just stay on top.
	* Even if the user changes focus. */
	SetWindowPos(wid, HWND_NOTOPMOST, 0, 0, 0, 0,
	SWP_NOMOVE \| SWP_NOSIZE \| SWP_SHOWWINDOW);
	}
	#endif
	}

	QPixmap icon(QStyle::StandardPixmap which)
	{
	QPixmap pm = qApp->windowIcon().pixmap(48, 48);

	if (which != QStyle::SP_CustomBase) {
	const QIcon ic = qApp->style()->standardIcon(which);
	QPainter painter(&pm);
	const int emblemSize = 22;
	painter.drawPixmap(pm.width() - emblemSize, 0,
	ic.pixmap(emblemSize, emblemSize));
	}

	return pm;
	}

	void PinEntryDialog::slotTimeout()
	{
	_timed_out = true;
	reject();
	}

	PinEntryDialog::PinEntryDialog(QWidget parent, const char name,
	int timeout, bool modal, bool enable_quality_bar,
	const QString &repeatString,
	const QString &visibilityTT,
	const QString &hideTT)
	: QDialog(parent),
	mRepeat(NULL),
	_grabbed(false),
	mVisibilityTT(visibilityTT),
	mHideTT(hideTT),
	mVisiActionEdit(NULL),
	mVisiCB(NULL)
	{
	_timed_out = false;

	if (modal) {
	setWindowModality(Qt::ApplicationModal);
	}

	_icon = new QLabel(this);
	_icon->setPixmap(icon());

	_error = new QLabel(this);
	QPalette pal;
	pal.setColor(QPalette::WindowText, Qt::red);
	_error->setPalette(pal);
	_error->hide();

	_desc = new QLabel(this);
	_desc->hide();

	_prompt = new QLabel(this);
	_prompt->hide();

	_edit = new QLineEdit(this);
	_edit->setMaxLength(256);
	_edit->setEchoMode(QLineEdit::Password);

	_prompt->setBuddy(_edit);

	if (enable_quality_bar) {
	_quality_bar_label = new QLabel(this);
	_quality_bar_label->setAlignment(Qt::AlignVCenter);
	_quality_bar = new QProgressBar(this);
	_quality_bar->setAlignment(Qt::AlignCenter);
	_have_quality_bar = true;
	} else {
	_have_quality_bar = false;
	}

	QDialogButtonBox *const buttons = new QDialogButtonBox(this);
	buttons->setStandardButtons(QDialogButtonBox::Ok \| QDialogButtonBox::Cancel);
	_ok = buttons->button(QDialogButtonBox::Ok);
	_cancel = buttons->button(QDialogButtonBox::Cancel);

	_ok->setDefault(true);

	if (style()->styleHint(QStyle::SH_DialogButtonBox_ButtonsHaveIcons)) {
	_ok->setIcon(style()->standardIcon(QStyle::SP_DialogOkButton));
	_cancel->setIcon(style()->standardIcon(QStyle::SP_DialogCancelButton));
	}

	if (timeout > 0) {
	_timer = new QTimer(this);
	connect(_timer, SIGNAL(timeout()), this, SLOT(slotTimeout()));
	_timer->start(timeout * 1000);
	} else {
	_timer = NULL;
	}

	connect(buttons, SIGNAL(accepted()), this, SLOT(accept()));
	connect(buttons, SIGNAL(rejected()), this, SLOT(reject()));
	connect(_edit, SIGNAL(textChanged(QString)),
	this, SLOT(updateQuality(QString)));
	connect(_edit, SIGNAL(textChanged(QString)),
	this, SLOT(textChanged(QString)));

	QTimer::singleShot(0, _edit, SLOT(setFocus()));

	QGridLayout *const grid = new QGridLayout(this);
	int row = 1;
	grid->addWidget(_error, row++, 1, 1, 2);
	grid->addWidget(_desc, row++, 1, 1, 2);
	//grid->addItem( new QSpacerItem( 0, _edit->height() / 10, QSizePolicy::Minimum, QSizePolicy::Fixed ), 1, 1 );
	grid->addWidget(_prompt, row, 1);
	grid->addWidget(_edit, row++, 2);
	if (!repeatString.isNull()) {
	mRepeat = new QLineEdit;
	mRepeat->setMaxLength(256);
	mRepeat->setEchoMode(QLineEdit::Password);
	connect(mRepeat, SIGNAL(textChanged(QString)),
	this, SLOT(textChanged(QString)));
	QLabel *repeatLabel = new QLabel(repeatString);
	repeatLabel->setBuddy(mRepeat);
	grid->addWidget(repeatLabel, row, 1);
	grid->addWidget(mRepeat, row++, 2);
	setTabOrder(_edit, mRepeat);
	setTabOrder(mRepeat, _ok);
	}
	if (enable_quality_bar) {
	grid->addWidget(_quality_bar_label, row, 1);
	grid->addWidget(_quality_bar, row++, 2);
	}
	/* Set up the show password action */
	const QIcon visibilityIcon = QIcon::fromTheme(QLatin1String("visibility"));
	const QIcon hideIcon = QIcon::fromTheme(QLatin1String("hint"));
	#if QT_VERSION >= 0x050200
	if (!visibilityIcon.isNull() && !hideIcon.isNull()) {
	mVisiActionEdit = _edit->addAction(visibilityIcon, QLineEdit::TrailingPosition);
	mVisiActionEdit->setVisible(false);
	mVisiActionEdit->setToolTip(mVisibilityTT);
	connect(mVisiActionEdit, SIGNAL(triggered()), this, SLOT(toggleVisibility()));
	} else
	#endif
	{
	if (!mVisibilityTT.isNull()) {
	mVisiCB = new QCheckBox(mVisibilityTT);
	connect(mVisiCB, SIGNAL(toggled(bool)), this, SLOT(toggleVisibility()));
	grid->addWidget(mVisiCB, row++, 1, 1, 2, Qt::AlignLeft);
	}
	}
	grid->addWidget(buttons, ++row, 0, 1, 3);

	grid->addWidget(_icon, 0, 0, row - 1, 1, Qt::AlignVCenter \| Qt::AlignLeft);

	grid->setSizeConstraint(QLayout::SetFixedSize);


	connect(qApp, SIGNAL(focusChanged(QWidget , QWidget )),
	this, SLOT(focusChanged(QWidget , QWidget )));
	}

	void PinEntryDialog::showEvent(QShowEvent *event)
	{
	QDialog::showEvent(event);
	raiseWindow(this);
	}

	void PinEntryDialog::setDescription(const QString &txt)
	{
	_desc->setVisible(!txt.isEmpty());
	_desc->setText(txt);
	#ifndef QT_NO_ACCESSIBILITY
	_desc->setAccessibleDescription(txt);
	#endif
	_icon->setPixmap(icon());
	setError(QString::null);
	}

	QString PinEntryDialog::description() const
	{
	return _desc->text();
	}

	void PinEntryDialog::setError(const QString &txt)
	{
	if (!txt.isNull()) {
	_icon->setPixmap(icon(QStyle::SP_MessageBoxCritical));
	}
	_error->setText(txt);
	#ifndef QT_NO_ACCESSIBILITY
	_error->setAccessibleDescription(txt);
	#endif
	_error->setVisible(!txt.isEmpty());
	}

	QString PinEntryDialog::error() const
	{
	return _error->text();
	}

	void PinEntryDialog::setPin(const QString &txt)
	{
	_edit->setText(txt);
	}

	QString PinEntryDialog::pin() const
	{
	return _edit->text();
	}

	void PinEntryDialog::setPrompt(const QString &txt)
	{
	_prompt->setText(txt);
	_prompt->setVisible(!txt.isEmpty());
	}

	QString PinEntryDialog::prompt() const
	{
	return _prompt->text();
	}

	void PinEntryDialog::setOkText(const QString &txt)
	{
	_ok->setText(txt);
	#ifndef QT_NO_ACCESSIBILITY
	_ok->setAccessibleDescription(txt);
	#endif
	_ok->setVisible(!txt.isEmpty());
	}

	void PinEntryDialog::setCancelText(const QString &txt)
	{
	_cancel->setText(txt);
	#ifndef QT_NO_ACCESSIBILITY
	_cancel->setAccessibleDescription(txt);
	#endif
	_cancel->setVisible(!txt.isEmpty());
	}

	void PinEntryDialog::setQualityBar(const QString &txt)
	{
	if (_have_quality_bar) {
	_quality_bar_label->setText(txt);
	#ifndef QT_NO_ACCESSIBILITY
	_quality_bar_label->setAccessibleDescription(txt);
	#endif
	}
	}

	void PinEntryDialog::setQualityBarTT(const QString &txt)
	{
	if (_have_quality_bar) {
	_quality_bar->setToolTip(txt);
	}
	}

	void PinEntryDialog::updateQuality(const QString &txt)
	{
	int length;
	int percent;
	QPalette pal;

	if (_timer) {
	_timer->stop();
	}

	if (!_have_quality_bar \|\| !_pinentry_info) {
	return;
	}
	const QByteArray utf8_pin = txt.toUtf8();
	const char *pin = utf8_pin.constData();
	length = strlen(pin);
	percent = length ? pinentry_inq_quality(_pinentry_info, pin, length) : 0;
	if (!length) {
	_quality_bar->reset();
	} else {
	pal = _quality_bar->palette();
	if (percent < 0) {
	pal.setColor(QPalette::Highlight, QColor("red"));
	percent = -percent;
	} else {
	pal.setColor(QPalette::Highlight, QColor("green"));
	}
	_quality_bar->setPalette(pal);
	_quality_bar->setValue(percent);
	}
	}

	void PinEntryDialog::setPinentryInfo(pinentry_t peinfo)
	{
	_pinentry_info = peinfo;
	}

	void PinEntryDialog::focusChanged(QWidget old, QWidget now)
	{
	// Grab keyboard. It might be a little weird to do it here, but it works!
	// Previously this code was in showEvent, but that did not work in Qt4.
	if (!_pinentry_info \|\| _pinentry_info->grab) {
	if (_grabbed && old && (old == _edit \|\| old == mRepeat)) {
	old->releaseKeyboard();
	_grabbed = false;
	}
	if (!_grabbed && now && (now == _edit \|\| now == mRepeat)) {
	now->grabKeyboard();
	_grabbed = true;
	}
	}

	}

	void PinEntryDialog::textChanged(const QString &text)
	{
	Q_UNUSED(text);
	if (mRepeat && mRepeat->text() == _edit->text()) {
	_ok->setEnabled(true);
	_ok->setToolTip(QString());
	} else if (mRepeat) {
	_ok->setEnabled(false);
	_ok->setToolTip(mRepeatError);
	}

	if (mVisiActionEdit && sender() == _edit) {
	mVisiActionEdit->setVisible(!_edit->text().isEmpty());
	}
	}

	void PinEntryDialog::toggleVisibility()
	{
	if (sender() == mVisiActionEdit) {
	if (_edit->echoMode() == QLineEdit::Password) {
	mVisiActionEdit->setIcon(QIcon::fromTheme(QLatin1String("hint")));
	mVisiActionEdit->setToolTip(mHideTT);
	_edit->setEchoMode(QLineEdit::Normal);
	if (mRepeat) {
	mRepeat->setEchoMode(QLineEdit::Normal);
	}
	} else {
	mVisiActionEdit->setIcon(QIcon::fromTheme(QLatin1String("visibility")));
	mVisiActionEdit->setToolTip(mVisibilityTT);
	_edit->setEchoMode(QLineEdit::Password);
	if (mRepeat) {
	mRepeat->setEchoMode(QLineEdit::Password);
	}
	}
	}
	if (sender() == mVisiCB) {
	if (mVisiCB->isChecked()) {
	if (mRepeat) {
	mRepeat->setEchoMode(QLineEdit::Normal);
	}
	_edit->setEchoMode(QLineEdit::Normal);
	} else {
	if (mRepeat) {
	mRepeat->setEchoMode(QLineEdit::Password);
	}
	_edit->setEchoMode(QLineEdit::Password);
	}
	}
	}

	QString PinEntryDialog::repeatedPin() const
	{
	if (mRepeat) {
	return mRepeat->text();
	}
	return QString();
	}

	bool PinEntryDialog::timedOut() const
	{
	return _timed_out;
	}

	void PinEntryDialog::setRepeatErrorText(const QString &err)
	{
	mRepeatError = err;
	}
	#include "pinentrydialog.moc"

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