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
	* Copyright (C) 2021, 2022 g10 Code GmbH
	*
	* Written by Steffen Hansen <steffen@klaralvdalens-datakonsult.se>.
	* Modified by Andre Heinecke <aheinecke@intevation.de>
	* Software engineering by Ingo Klöcker <dev@ingo-kloecker.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+
	*/

	#ifdef HAVE_CONFIG_H
	# include "config.h"
	#endif

	#include "pinentrydialog.h"

	#include "accessibility.h"
	#include "capslock.h"
	#include "pinlineedit.h"
	#include "util.h"

	#include <QGridLayout>
	#include <QProgressBar>
	#include <QApplication>
	#include <QFontMetrics>
	#include <QStyle>
	#include <QPainter>
	#include <QPushButton>
	#include <QDialogButtonBox>
	#include <QKeyEvent>
	#include <QLabel>
	#include <QPalette>
	#include <QLineEdit>
	#include <QAction>
	#include <QCheckBox>
	#include <QHBoxLayout>
	#include <QVBoxLayout>
	#include <QMessageBox>
	#include <QRegularExpression>
	#include <QAccessible>

	#include <QDebug>

	#ifdef Q_OS_WIN
	#include <windows.h>
	#if QT_VERSION >= 0x050700
	#include <QtPlatformHeaders/QWindowsWindowFunctions>
	#endif
	#endif

	void raiseWindow(QWidget *w)
	{
	#ifdef Q_OS_WIN
	#if QT_VERSION >= 0x050700
	QWindowsWindowFunctions::setWindowActivationBehavior(
	QWindowsWindowFunctions::AlwaysActivateWindow);
	#endif
	#endif
	w->setWindowState((w->windowState() & ~Qt::WindowMinimized) \| Qt::WindowActive);
	w->activateWindow();
	w->raise();
	}

	QPixmap applicationIconPixmap(const QIcon &overlayIcon)
	{
	QPixmap pm = qApp->windowIcon().pixmap(48, 48);

	if (!overlayIcon.isNull()) {
	QPainter painter(&pm);
	const int emblemSize = 22;
	painter.drawPixmap(pm.width() - emblemSize, 0,
	overlayIcon.pixmap(emblemSize, emblemSize));
	}

	return pm;
	}

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

	PinEntryDialog::PinEntryDialog(pinentry_t pe, QWidget parent, const char name,
	bool modal,
	const QString &repeatString,
	const QString &visibilityTT,
	const QString &hideTT)
	: QDialog{parent}
	, _have_quality_bar{!!pe->quality_bar}
	, _pinentry_info{pe}
	, mVisibilityTT{visibilityTT}
	, mHideTT{hideTT}
	{
	Q_UNUSED(name)

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

	QPalette redTextPalette;
	redTextPalette.setColor(QPalette::WindowText, Qt::red);

	auto *const mainLayout = new QVBoxLayout{this};

	auto *const hbox = new QHBoxLayout;

	_icon = new QLabel(this);
	_icon->setPixmap(applicationIconPixmap());
	hbox->addWidget(_icon, 0, Qt::AlignVCenter \| Qt::AlignLeft);

	auto *const grid = new QGridLayout;
	int row = 1;

	_error = new QLabel{this};
	_error->setTextFormat(Qt::PlainText);
	_error->setTextInteractionFlags(Qt::TextSelectableByMouse);
	_error->setPalette(redTextPalette);
	_error->hide();
	grid->addWidget(_error, row, 1, 1, 2);

	row++;
	_desc = new QLabel{this};
	_desc->setTextFormat(Qt::PlainText);
	_desc->setTextInteractionFlags(Qt::TextSelectableByMouse);
	_desc->hide();
	grid->addWidget(_desc, row, 1, 1, 2);

	row++;
	mCapsLockHint = new QLabel{this};
	mCapsLockHint->setTextFormat(Qt::PlainText);
	mCapsLockHint->setTextInteractionFlags(Qt::TextSelectableByMouse);
	mCapsLockHint->setPalette(redTextPalette);
	mCapsLockHint->setAlignment(Qt::AlignCenter);
	mCapsLockHint->setVisible(false);
	grid->addWidget(mCapsLockHint, row, 1, 1, 2);

	row++;
	{
	_prompt = new QLabel(this);
	_prompt->setTextFormat(Qt::PlainText);
	_prompt->setTextInteractionFlags(Qt::TextSelectableByMouse);
	_prompt->hide();
	grid->addWidget(_prompt, row, 1);

	const auto l = new QHBoxLayout;
	_edit = new PinLineEdit(this);
	_edit->setMaxLength(256);
	_edit->setMinimumWidth(_edit->fontMetrics().averageCharWidth()*20 + 48);
	_edit->setEchoMode(QLineEdit::Password);
	_prompt->setBuddy(_edit);
	l->addWidget(_edit, 1);

	if (!repeatString.isNull()) {
	mGenerateButton = new QPushButton{this};
	mGenerateButton->setIcon(QIcon(QLatin1String(":/icons/password-generate")));
	mGenerateButton->setVisible(false);
	l->addWidget(mGenerateButton);
	}
	grid->addLayout(l, row, 2);
	}

	/* Set up the show password action */
	const QIcon visibilityIcon = QIcon(QLatin1String(":/icons/visibility.svg"));
	const QIcon hideIcon = QIcon(QLatin1String(":/icons/hint.svg"));
	#if QT_VERSION >= 0x050200
	if (!visibilityIcon.isNull() && !hideIcon.isNull()) {
	mVisiActionEdit = _edit->addAction(visibilityIcon, QLineEdit::TrailingPosition);
	mVisiActionEdit->setVisible(false);
	mVisiActionEdit->setToolTip(mVisibilityTT);
	} else
	#endif
	{
	if (!mVisibilityTT.isNull()) {
	row++;
	mVisiCB = new QCheckBox{mVisibilityTT, this};
	grid->addWidget(mVisiCB, row, 1, 1, 2, Qt::AlignLeft);
	}
	}

	row++;
	mConstraintsHint = new QLabel{this};
	mConstraintsHint->setTextFormat(Qt::PlainText);
	mConstraintsHint->setTextInteractionFlags(Qt::TextSelectableByMouse);
	mConstraintsHint->setVisible(false);
	grid->addWidget(mConstraintsHint, row, 2);

	row++;
	mFormattedPassphraseHintSpacer = new QLabel{this};
	mFormattedPassphraseHintSpacer->setVisible(false);
	mFormattedPassphraseHint = new QLabel{this};
	mFormattedPassphraseHint->setTextFormat(Qt::PlainText);
	mFormattedPassphraseHint->setTextInteractionFlags(Qt::TextSelectableByMouse);
	mFormattedPassphraseHint->setVisible(false);
	grid->addWidget(mFormattedPassphraseHintSpacer, row, 1);
	grid->addWidget(mFormattedPassphraseHint, row, 2);

	if (!repeatString.isNull()) {
	row++;
	auto repeatLabel = new QLabel{this};
	repeatLabel->setTextFormat(Qt::PlainText);
	repeatLabel->setTextInteractionFlags(Qt::TextSelectableByMouse);
	repeatLabel->setText(repeatString);
	grid->addWidget(repeatLabel, row, 1);

	mRepeat = new PinLineEdit(this);
	mRepeat->setMaxLength(256);
	mRepeat->setEchoMode(QLineEdit::Password);
	repeatLabel->setBuddy(mRepeat);
	grid->addWidget(mRepeat, row, 2);

	row++;
	mRepeatError = new QLabel{this};
	mRepeatError->setTextFormat(Qt::PlainText);
	mRepeatError->setTextInteractionFlags(Qt::TextSelectableByMouse);
	mRepeatError->setPalette(redTextPalette);
	mRepeatError->hide();
	grid->addWidget(mRepeatError, row, 2);
	}

	if (_have_quality_bar) {
	row++;
	_quality_bar_label = new QLabel(this);
	_quality_bar_label->setTextFormat(Qt::PlainText);
	_quality_bar_label->setTextInteractionFlags(Qt::TextSelectableByMouse);
	_quality_bar_label->setAlignment(Qt::AlignVCenter);
	grid->addWidget(_quality_bar_label, row, 1);

	_quality_bar = new QProgressBar(this);
	_quality_bar->setAlignment(Qt::AlignCenter);
	_quality_bar_label->setBuddy(_quality_bar);
	grid->addWidget(_quality_bar, row, 2);
	}

	++row;
	mSavePassphraseCB = new QCheckBox{this};
	mSavePassphraseCB->setVisible(false);
	mSavePassphraseCB->setCheckState(!!_pinentry_info->may_cache_password
	? Qt::Checked
	: Qt::Unchecked);
	#ifdef HAVE_LIBSECRET
	if (_pinentry_info->allow_external_password_cache && _pinentry_info->keyinfo) {
	mSavePassphraseCB->setVisible(true);
	}
	#endif
	grid->addWidget(mSavePassphraseCB, row, 1, 1, 2);

	hbox->addLayout(grid, 1);
	mainLayout->addLayout(hbox);

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

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

	mainLayout->addStretch(1);
	mainLayout->addWidget(buttons);
	mainLayout->setSizeConstraint(QLayout::SetFixedSize);

	if (_pinentry_info->timeout > 0) {
	_timer = new QTimer(this);
	connect(_timer, &QTimer::timeout, this, &PinEntryDialog::slotTimeout);
	_timer->start(_pinentry_info->timeout * 1000);
	}

	connect(buttons, &QDialogButtonBox::accepted,
	this, &PinEntryDialog::onAccept);
	connect(buttons, &QDialogButtonBox::rejected,
	this, &QDialog::reject);
	connect(_edit, &QLineEdit::textChanged,
	this, &PinEntryDialog::updateQuality);
	connect(_edit, &QLineEdit::textChanged,
	this, &PinEntryDialog::textChanged);
	connect(_edit, &PinLineEdit::backspacePressed,
	this, &PinEntryDialog::onBackspace);
	if (mGenerateButton) {
	connect(mGenerateButton, &QPushButton::clicked,
	this, &PinEntryDialog::generatePin);
	}
	if (mVisiActionEdit) {
	connect(mVisiActionEdit, &QAction::triggered,
	this, &PinEntryDialog::toggleVisibility);
	}
	if (mVisiCB) {
	connect(mVisiCB, &QCheckBox::toggled,
	this, &PinEntryDialog::toggleVisibility);
	}
	if (mRepeat) {
	connect(mRepeat, &QLineEdit::textChanged,
	this, &PinEntryDialog::textChanged);
	}
	connect(mSavePassphraseCB, &QCheckBox::toggled,
	this, &PinEntryDialog::togglePasswordCaching);

	auto capsLockWatcher = new CapsLockWatcher{this};
	connect(capsLockWatcher, &CapsLockWatcher::stateChanged,
	this, [this] (bool locked) {
	mCapsLockHint->setVisible(locked);
	});

	connect(qApp, &QApplication::focusChanged,
	this, &PinEntryDialog::focusChanged);
	connect(qApp, &QApplication::applicationStateChanged,
	this, &PinEntryDialog::checkCapsLock);
	checkCapsLock();

	#ifndef QT_NO_ACCESSIBILITY
	QAccessible::installActivationObserver(this);
	accessibilityActiveChanged(QAccessible::isActive());
	#endif

	#if QT_VERSION >= 0x050000
	/* This is mostly an issue on Windows where this results
	in the pinentry popping up nicely with an animation and
	comes to front. It is not ifdefed for Windows only since
	window managers on Linux like KWin can also have this
	result in an animation when the pinentry is shown and
	not just popping it up.
	*/
	if (qApp->platformName() != QLatin1String("wayland")) {
	setWindowState(Qt::WindowMinimized);
	QTimer::singleShot(0, this, [this] () {
	raiseWindow(this);
	});
	}
	#else
	activateWindow();
	raise();
	#endif
	}

	PinEntryDialog::~PinEntryDialog()
	{
	#ifndef QT_NO_ACCESSIBILITY
	QAccessible::removeActivationObserver(this);
	#endif
	}

	void PinEntryDialog::keyPressEvent(QKeyEvent *e)
	{
	const auto returnPressed =
	(!e->modifiers() && (e->key() == Qt::Key_Enter \|\| e->key() == Qt::Key_Return))
	\|\| (e->modifiers() & Qt::KeypadModifier && e->key() == Qt::Key_Enter);
	if (returnPressed && _edit->hasFocus() && mRepeat) {
	// if the user pressed Return in the first input field, then move the
	// focus to the repeat input field and prevent further event processing
	// by QDialog (which would trigger the default button)
	mRepeat->setFocus();
	e->ignore();
	return;
	}

	QDialog::keyPressEvent(e);
	}

	void PinEntryDialog::keyReleaseEvent(QKeyEvent *event)
	{
	QDialog::keyReleaseEvent(event);
	checkCapsLock();
	}

	void PinEntryDialog::showEvent(QShowEvent *event)
	{
	QDialog::showEvent(event);
	_edit->setFocus();
	}

	void PinEntryDialog::setDescription(const QString &txt)
	{
	_desc->setVisible(!txt.isEmpty());
	_desc->setText(txt);
	_icon->setPixmap(applicationIconPixmap());
	setError(QString());
	}

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

	void PinEntryDialog::setError(const QString &txt)
	{
	if (!txt.isNull()) {
	_icon->setPixmap(applicationIconPixmap(QIcon{QStringLiteral(":/icons/data-error.svg")}));
	}
	_error->setText(txt);
	_error->setVisible(!txt.isEmpty());
	}

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

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

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

	void PinEntryDialog::setPrompt(const QString &txt)
	{
	_prompt->setText(txt);
	_prompt->setVisible(!txt.isEmpty());
	if (txt.contains("PIN"))
	_disable_echo_allowed = false;
	}

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

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

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

	void PinEntryDialog::setQualityBar(const QString &txt)
	{
	if (_have_quality_bar) {
	_quality_bar_label->setText(txt);
	}
	}

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

	void PinEntryDialog::setGenpinLabel(const QString &txt)
	{
	if (!mGenerateButton) {
	return;
	}
	mGenerateButton->setVisible(!txt.isEmpty());
	if (!txt.isEmpty()) {
	Accessibility::setName(mGenerateButton, txt);
	}
	}

	void PinEntryDialog::setGenpinTT(const QString &txt)
	{
	if (mGenerateButton) {
	mGenerateButton->setToolTip(txt);
	}
	}

	void PinEntryDialog::setCapsLockHint(const QString &txt)
	{
	mCapsLockHint->setText(txt);
	}

	void PinEntryDialog::setFormattedPassphrase(const PinEntryDialog::FormattedPassphraseOptions &options)
	{
	mFormatPassphrase = options.formatPassphrase;
	mFormattedPassphraseHint->setTextFormat(Qt::RichText);
	mFormattedPassphraseHint->setText(QLatin1String("<html>") + options.hint.toHtmlEscaped() + QLatin1String("</html>"));
	Accessibility::setName(mFormattedPassphraseHint, options.hint);
	toggleFormattedPassphrase();
	}

	void PinEntryDialog::setConstraintsOptions(const ConstraintsOptions &options)
	{
	mEnforceConstraints = options.enforce;
	mConstraintsHint->setText(options.shortHint);
	if (!options.longHint.isEmpty()) {
	mConstraintsHint->setToolTip(QLatin1String("<html>") +
	options.longHint.toHtmlEscaped().replace(QLatin1String("\n\n"), QLatin1String("<br>")) +
	QLatin1String("</html>"));
	Accessibility::setDescription(mConstraintsHint, options.longHint);
	}
	mConstraintsErrorTitle = options.errorTitle;

	mConstraintsHint->setVisible(mEnforceConstraints && !options.shortHint.isEmpty());
	}

	void PinEntryDialog::toggleFormattedPassphrase()
	{
	const bool enableFormatting = mFormatPassphrase && _edit->echoMode() == QLineEdit::Normal;
	_edit->setFormattedPassphrase(enableFormatting);
	if (mRepeat) {
	mRepeat->setFormattedPassphrase(enableFormatting);
	const bool hintAboutToBeHidden = mFormattedPassphraseHint->isVisible() && !enableFormatting;
	if (hintAboutToBeHidden) {
	// set hint spacer to current height of hint label before hiding the hint
	mFormattedPassphraseHintSpacer->setMinimumHeight(mFormattedPassphraseHint->height());
	mFormattedPassphraseHintSpacer->setVisible(true);
	} else if (enableFormatting) {
	mFormattedPassphraseHintSpacer->setVisible(false);
	}
	mFormattedPassphraseHint->setVisible(enableFormatting);
	}
	}

	void PinEntryDialog::togglePasswordCaching(bool enabled)
	{
	_pinentry_info->may_cache_password = enabled;
	}

	void PinEntryDialog::onBackspace()
	{
	cancelTimeout();

	if (_disable_echo_allowed) {
	_edit->setEchoMode(QLineEdit::NoEcho);
	if (mRepeat) {
	mRepeat->setEchoMode(QLineEdit::NoEcho);
	}
	}
	}

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

	_disable_echo_allowed = false;

	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::setSavePassphraseCBText(const QString &text)
	{
	mSavePassphraseCB->setText(text);
	}

	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);

	cancelTimeout();

	if (mVisiActionEdit && sender() == _edit) {
	mVisiActionEdit->setVisible(!_edit->pin().isEmpty());
	}
	if (mGenerateButton) {
	mGenerateButton->setVisible(
	_edit->pin().isEmpty()
	#ifndef QT_NO_ACCESSIBILITY
	&& !mGenerateButton->accessibleName().isEmpty()
	#endif
	);
	}
	}

	void PinEntryDialog::generatePin()
	{
	unique_malloced_ptr<char> pin{pinentry_inq_genpin(_pinentry_info)};
	if (pin) {
	if (_edit->echoMode() == QLineEdit::Password) {
	if (mVisiActionEdit) {
	mVisiActionEdit->trigger();
	}
	if (mVisiCB) {
	mVisiCB->setChecked(true);
	}
	}
	const auto pinStr = QString::fromUtf8(pin.get());
	_edit->setPin(pinStr);
	mRepeat->setPin(pinStr);
	// explicitly focus the first input field and select the generated password
	_edit->setFocus();
	_edit->selectAll();
	}
	}

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

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

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

	void PinEntryDialog::setRepeatErrorText(const QString &err)
	{
	if (mRepeatError) {
	mRepeatError->setText(err);
	}
	}

	void PinEntryDialog::cancelTimeout()
	{
	if (_timer) {
	_timer->stop();
	}
	}

	void PinEntryDialog::checkCapsLock()
	{
	const auto state = capsLockState();
	if (state != LockState::Unknown) {
	mCapsLockHint->setVisible(state == LockState::On);
	}
	}

	void PinEntryDialog::onAccept()
	{
	cancelTimeout();

	if (mRepeat && mRepeat->pin() != _edit->pin()) {
	#ifndef QT_NO_ACCESSIBILITY
	if (QAccessible::isActive()) {
	QMessageBox::information(this, mRepeatError->text(), mRepeatError->text());
	} else
	#endif
	{
	mRepeatError->setVisible(true);
	}
	return;
	}

	const auto result = checkConstraints();
	if (result != PassphraseNotOk) {
	accept();
	}
	}

	#ifndef QT_NO_ACCESSIBILITY
	void PinEntryDialog::accessibilityActiveChanged(bool active)
	{
	// Allow text labels to get focus if accessibility is active
	const auto focusPolicy = active ? Qt::StrongFocus : Qt::ClickFocus;
	_error->setFocusPolicy(focusPolicy);
	_desc->setFocusPolicy(focusPolicy);
	mCapsLockHint->setFocusPolicy(focusPolicy);
	mConstraintsHint->setFocusPolicy(focusPolicy);
	mFormattedPassphraseHint->setFocusPolicy(focusPolicy);
	if (mRepeatError) {
	mRepeatError->setFocusPolicy(focusPolicy);
	}
	}
	#endif

	PinEntryDialog::PassphraseCheckResult PinEntryDialog::checkConstraints()
	{
	if (!mEnforceConstraints) {
	return PassphraseNotChecked;
	}

	const auto passphrase = _edit->pin().toUtf8();
	unique_malloced_ptr<char> error{pinentry_inq_checkpin(
	_pinentry_info, passphrase.constData(), passphrase.size())};

	if (!error) {
	return PassphraseOk;
	}

	const auto messageLines = QString::fromUtf8(QByteArray::fromPercentEncoding(error.get())).split(QChar{'\n'});
	if (messageLines.isEmpty()) {
	// shouldn't happen because pinentry_inq_checkpin() either returns NULL or a non-empty string
	return PassphraseOk;
	}
	const auto firstLine = messageLines.first();
	const auto indexOfFirstNonEmptyAdditionalLine = messageLines.indexOf(QRegularExpression{QStringLiteral(".\\S.")}, 1);
	const auto additionalLines = indexOfFirstNonEmptyAdditionalLine > 0 ? messageLines.mid(indexOfFirstNonEmptyAdditionalLine).join(QChar{'\n'}) : QString{};
	QMessageBox messageBox{this};
	messageBox.setIcon(QMessageBox::Information);
	messageBox.setWindowTitle(mConstraintsErrorTitle);
	messageBox.setText(firstLine);
	messageBox.setInformativeText(additionalLines);
	messageBox.setStandardButtons(QMessageBox::Ok);
	messageBox.exec();
	return PassphraseNotOk;
	}

	#include "pinentrydialog.moc"

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