weboftrustwidget.cpp
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weboftrustwidget.cpp
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	/*
	This file is part of Kleopatra, the KDE keymanager
	SPDX-FileCopyrightText: 2017 Intevation GmbH
	SPDX-FileCopyrightText: 2020 g10 Code GmbH
	SPDX-FileContributor: Ingo Klöcker <dev@ingo-kloecker.de>

	SPDX-License-Identifier: GPL-2.0-or-later
	*/

	#include "weboftrustwidget.h"

	#include "commands/certifycertificatecommand.h"
	#include "commands/importcertificatefromkeyservercommand.h"
	#include "commands/revokecertificationcommand.h"

	#include <Libkleo/Formatting>
	#include <Libkleo/KeyCache>
	#include <Libkleo/KeyHelpers>
	#include <Libkleo/TreeView>
	#include <Libkleo/UserIDListModel>
	#include <Libkleo/UserIDListProxyModel>

	#include <KLocalizedString>
	#include <KMessageBox>
	#include <KSeparator>

	#include <QCheckBox>
	#include <QDialogButtonBox>
	#include <QHeaderView>
	#include <QLabel>
	#include <QMenu>
	#include <QPushButton>
	#include <QVBoxLayout>

	#include <QGpgME/KeyListJob>
	#include <QGpgME/Protocol>

	#include <gpgme++/key.h>
	#include <gpgme++/keylistresult.h>

	#include "kleopatra_debug.h"

	using namespace Kleo;

	namespace
	{
	void addActionButton(QLayout buttonBox, QAction action)
	{
	if (!action) {
	return;
	}
	auto button = new QPushButton(buttonBox->parentWidget());
	button->setText(action->text());
	buttonBox->addWidget(button);
	button->setEnabled(action->isEnabled());
	QObject::connect(action, &QAction::changed, button, [action, button]() {
	button->setEnabled(action->isEnabled());
	});
	QObject::connect(button, &QPushButton::clicked, action, &QAction::trigger);
	}
	}

	class WebOfTrustWidget::Private
	{
	friend class ::Kleo::WebOfTrustWidget;
	WebOfTrustWidget *const q;

	private:
	GpgME::Key key;
	UserIDListModel certificationsModel;
	UserIDListProxyModel proxyModel;
	QGpgME::KeyListJob *keyListJob = nullptr;
	TreeView *certificationsTV = nullptr;
	QAction *detailsAction = nullptr;
	QAction *certifyAction = nullptr;
	QAction *revokeAction = nullptr;
	QAction *fetchAction = nullptr;
	QLabel *notAvailableLabel = nullptr;
	QPushButton *moreButton = nullptr;
	QCheckBox *showOnlyOwnCheck = nullptr;

	public:
	Private(WebOfTrustWidget *qq)
	: q{qq}
	{
	certificationsModel.enableRemarks(true);
	auto vLay = new QVBoxLayout(q);
	vLay->setContentsMargins({});

	proxyModel.setSourceModel(&certificationsModel);

	certificationsTV = new TreeView{q};
	certificationsTV->setAccessibleName(i18n("User IDs and certifications"));
	certificationsTV->setModel(&proxyModel);
	certificationsTV->setAllColumnsShowFocus(false);
	certificationsTV->setSelectionMode(QAbstractItemView::SingleSelection);
	vLay->addWidget(certificationsTV);

	notAvailableLabel = new QLabel(i18nc("@info", "Certifications are not available before the certificate is imported."));
	notAvailableLabel->setAlignment(Qt::AlignHCenter);
	notAvailableLabel->setVisible(false);
	vLay->addWidget(notAvailableLabel);

	detailsAction = new QAction{QIcon::fromTheme(QStringLiteral("info")), i18nc("@action", "Show Certificate Details"), q};
	connect(detailsAction, &QAction::triggered, q, [this]() {
	showCertificateDetails();
	});

	certifyAction = new QAction{QIcon::fromTheme(QStringLiteral("view-certificate-sign")), i18nc("@action", "Add Certification"), q};
	connect(certifyAction, &QAction::triggered, q, [this]() {
	addCertification();
	});

	if (Kleo::Commands::RevokeCertificationCommand::isSupported()) {
	revokeAction = new QAction{QIcon::fromTheme(QStringLiteral("view-certificate-revoke")), i18nc("@action", "Revoke Certification"), q};
	connect(revokeAction, &QAction::triggered, q, [this]() {
	revokeCertification();
	});
	}

	fetchAction = new QAction(QIcon::fromTheme(QStringLiteral("download")), i18nc("@action:button", "Fetch Missing Keys"));
	fetchAction->setToolTip(i18nc("@info:tooltip", "Look up and import all keys that were used to certify the user IDs of this key"));
	connect(fetchAction, &QAction::triggered, q, [this]() {
	fetchMissingKeys();
	});

	auto bbox = new QHBoxLayout;

	addActionButton(bbox, certifyAction);
	addActionButton(bbox, revokeAction);

	moreButton = new QPushButton(QIcon::fromTheme(QStringLiteral("application-menu")), {});
	moreButton->setToolTip(i18nc("@info:tooltip", "Show more options"));
	bbox->addWidget(moreButton);
	connect(moreButton, &QPushButton::clicked, q, [this]() {
	auto menu = new QMenu(q);
	menu->addAction(detailsAction);
	menu->addAction(fetchAction);
	menu->popup(moreButton->mapToGlobal(QPoint()));
	});

	showOnlyOwnCheck = new QCheckBox(i18nc("label:checkbox", "Show only my own certifications"));
	bbox->addWidget(showOnlyOwnCheck);
	connect(showOnlyOwnCheck, &QCheckBox::toggled, &proxyModel, &UserIDListProxyModel::setShowOnlyOwnCertifications);

	bbox->addStretch(1);

	vLay->addLayout(bbox);

	connect(certificationsTV, &QAbstractItemView::doubleClicked, q, [this]() {
	certificationDblClicked();
	});
	certificationsTV->setContextMenuPolicy(Qt::CustomContextMenu);
	connect(certificationsTV, &QWidget::customContextMenuRequested, q, [this](const QPoint &p) {
	contextMenuRequested(p);
	});
	connect(certificationsTV->selectionModel(), &QItemSelectionModel::currentRowChanged, q, [this]() {
	updateActions();
	});
	updateActions();
	}

	GpgME::UserID selectedUserID()
	{
	return proxyModel.userID(certificationsTV->currentIndex());
	}

	GpgME::UserID::Signature selectedCertification()
	{
	return proxyModel.signature(certificationsTV->currentIndex());
	}

	void certificationDblClicked()
	{
	showCertificateDetails();
	}

	void showCertificateDetails()
	{
	const auto signature = selectedCertification();
	if (signature.isNull()) {
	qCDebug(KLEOPATRA_LOG) << __func__ << "- no certification selected";
	return;
	}
	auto cmd = Command::commandForQuery(QString::fromUtf8(signature.signerKeyID()));
	cmd->setParentWidget(q->window());
	cmd->start();
	}

	void addCertification()
	{
	auto userID = selectedUserID();
	if (userID.isNull()) {
	userID = selectedCertification().parent();
	}
	if (userID.isNull()) {
	qCDebug(KLEOPATRA_LOG) << __func__ << "- no user ID or certification selected";
	return;
	}
	auto cmd = new Kleo::Commands::CertifyCertificateCommand(userID);
	cmd->setParentWidget(q);
	certificationsTV->setEnabled(false);
	connect(cmd, &Kleo::Commands::CertifyCertificateCommand::finished, q, [this]() {
	certificationsTV->setEnabled(true);
	// Trigger an update when done
	q->setKey(key);
	});
	cmd->start();
	}

	void revokeCertification()
	{
	Command *cmd = nullptr;
	if (const auto signature = selectedCertification(); !signature.isNull()) {
	cmd = new Kleo::Commands::RevokeCertificationCommand(signature);
	} else if (const auto userID = selectedUserID(); !userID.isNull()) {
	cmd = new Kleo::Commands::RevokeCertificationCommand(userID);
	} else {
	qCDebug(KLEOPATRA_LOG) << __func__ << "- no user ID or certification selected";
	return;
	}
	cmd->setParentWidget(q);
	certificationsTV->setEnabled(false);
	connect(cmd, &Kleo::Commands::RevokeCertificationCommand::finished, q, [this]() {
	certificationsTV->setEnabled(true);
	// Trigger an update when done
	q->setKey(key);
	});
	cmd->start();
	}

	void addActionsForUserID(QMenu *menu)
	{
	menu->addAction(certifyAction);
	if (revokeAction) {
	menu->addAction(revokeAction);
	}
	}

	void addActionsForSignature(QMenu *menu)
	{
	menu->addAction(detailsAction);
	if (revokeAction) {
	menu->addAction(revokeAction);
	if (!revokeAction->isEnabled()) {
	menu->setToolTipsVisible(true);
	}
	}
	}

	void updateActions()
	{
	const auto userCanSignUserIDs = userHasCertificationKey();
	const auto keyCanBeCertified = Kleo::canBeCertified(key);
	const auto userID = selectedUserID();
	const auto signature = selectedCertification();
	detailsAction->setEnabled(!signature.isNull());
	certifyAction->setEnabled(keyCanBeCertified && userCanSignUserIDs && !userID.isNull());
	if (revokeAction) {
	revokeAction->setToolTip({});
	if (!signature.isNull()) {
	const auto revocationFeasibility = userCanRevokeCertification(signature);
	revokeAction->setEnabled(revocationFeasibility == CertificationCanBeRevoked);
	switch (revocationFeasibility) {
	case CertificationCanBeRevoked:
	break;
	case CertificationNotMadeWithOwnKey:
	revokeAction->setToolTip(
	i18n("You cannot revoke this certification because it wasn't made with one of your keys (or the required secret key is missing)."));
	break;
	case CertificationIsSelfSignature:
	revokeAction->setToolTip(i18nc("@info:tooltip", "Revocation of self-certifications is currently not possible."));
	break;
	case CertificationIsRevocation:
	revokeAction->setToolTip(
	i18nc("@info:tooltip", "You cannot revoke this revocation certification. (But you can re-certify the corresponding user ID.)"));
	break;
	case CertificationIsExpired:
	revokeAction->setToolTip(i18nc("@info:tooltip", "You cannot revoke this expired certification."));
	break;
	case CertificationIsInvalid:
	revokeAction->setToolTip(i18nc("@info:tooltip", "You cannot revoke this invalid certification."));
	break;
	case CertificationKeyNotAvailable:
	revokeAction->setToolTip(i18nc("@info:tooltip", "You cannot revoke this certification because the required secret key is not available."));
	break;
	};
	} else if (!userID.isNull()) {
	const bool canRevokeCertification = userCanRevokeCertifications(userID);
	revokeAction->setEnabled(canRevokeCertification);
	if (!canRevokeCertification) {
	revokeAction->setToolTip(
	i18n("You cannot revoke any of the certifications of this user ID. Select any of the certifications for details."));
	}
	} else {
	revokeAction->setEnabled(false);
	}
	}
	}

	void contextMenuRequested(const QPoint &p)
	{
	const auto userID = proxyModel.userID(certificationsTV->indexAt(p));
	const auto signature = proxyModel.signature(certificationsTV->indexAt(p));

	if (userID.isNull() && signature.isNull()) {
	return;
	}

	auto menu = new QMenu(q);
	if (!userID.isNull()) {
	addActionsForUserID(menu);
	} else if (!signature.isNull()) {
	addActionsForSignature(menu);
	}
	connect(menu, &QMenu::aboutToHide, menu, &QObject::deleteLater);
	menu->popup(certificationsTV->viewport()->mapToGlobal(p));
	}

	void startSignatureListing()
	{
	if (keyListJob) {
	return;
	}
	QGpgME::KeyListJob const job = QGpgME::openpgp()->keyListJob(/remote/ false, /includeSigs/ true, /validate*/ true);
	if (!job) {
	return;
	}

	job->addMode(GpgME::SignatureNotations);

	connect(job, &QGpgME::KeyListJob::result, q, &WebOfTrustWidget::signatureListingDone);

	connect(job, &QGpgME::KeyListJob::nextKey, q, &WebOfTrustWidget::signatureListingNextKey);

	job->start(QStringList(QString::fromLatin1(key.primaryFingerprint())));
	keyListJob = job;
	}

	void fetchMissingKeys()
	{
	if (q->key().isNull()) {
	return;
	}
	const auto missingSignerKeyIds = Kleo::getMissingSignerKeyIds(q->key().userIDs());

	auto cmd = new Kleo::ImportCertificateFromKeyserverCommand{QStringList{std::begin(missingSignerKeyIds), std::end(missingSignerKeyIds)}};
	cmd->setParentWidget(q);
	fetchAction->setEnabled(false);
	connect(cmd, &Kleo::ImportCertificateFromKeyserverCommand::finished, q, [this]() {
	// Trigger an update when done
	q->setKey(q->key());
	fetchAction->setEnabled(true);
	});
	cmd->start();
	}
	};

	WebOfTrustWidget::WebOfTrustWidget(QWidget *parent)
	: QWidget{parent}
	, d{std::make_unique<Private>(this)}
	{
	}

	WebOfTrustWidget::~WebOfTrustWidget() = default;

	QAction *WebOfTrustWidget::detailsAction() const
	{
	return d->detailsAction;
	}

	QAction *WebOfTrustWidget::certifyAction() const
	{
	return d->certifyAction;
	}

	QAction *WebOfTrustWidget::revokeAction() const
	{
	return d->revokeAction;
	}

	GpgME::Key WebOfTrustWidget::key() const
	{
	return d->key;
	}

	void WebOfTrustWidget::setKey(const GpgME::Key &key)
	{
	if (key.protocol() != GpgME::OpenPGP) {
	qCDebug(KLEOPATRA_LOG) << "List of Certifications is only supported for OpenPGP keys";
	return;
	}

	if (isRemoteKey(key)) {
	d->certificationsTV->setVisible(false);
	d->notAvailableLabel->setVisible(true);
	d->moreButton->setEnabled(false);
	}

	d->key = key;
	d->certificationsModel.setKey(key);
	d->updateActions();
	d->certificationsTV->expandAll();
	d->startSignatureListing();
	if (!d->certificationsTV->restoreColumnLayout(QStringLiteral("WebOfTrustWidget"))) {
	d->certificationsTV->resizeToContentsLimited();
	}
	d->fetchAction->setEnabled(!key.isBad());
	}

	void WebOfTrustWidget::signatureListingNextKey(const GpgME::Key &key)
	{
	GpgME::Key merged = key;
	merged.mergeWith(d->key);
	setKey(merged);
	}

	void WebOfTrustWidget::signatureListingDone(const GpgME::KeyListResult &result)
	{
	if (result.error()) {
	KMessageBox::information(this,
	xi18nc("@info",
	"<para>An error occurred while loading the certifications: "
	"<message>%1</message></para>",
	Formatting::errorAsString(result.error())),
	i18nc("@title", "Certifications Loading Failed"));
	}
	d->keyListJob = nullptr;
	}

	#include "moc_weboftrustwidget.cpp"

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