qgpgmeencryptjob.cpp
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	/*
	qgpgmeencryptjob.cpp

	This file is part of qgpgme, the Qt API binding for gpgme
	Copyright (c) 2004,2007,2008 Klarälvdalens Datakonsult AB
	Copyright (c) 2016 by Bundesamt für Sicherheit in der Informationstechnik
	Software engineering by Intevation GmbH
	Copyright (c) 2022,2023 g10 Code GmbH
	Software engineering by Ingo Klöcker <dev@ingo-kloecker.de>

	QGpgME 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.

	QGpgME 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, write to the Free Software Foundation, Inc.,
	51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

	In addition, as a special exception, the copyright holders give
	permission to link the code of this program with any edition of
	the Qt library by Trolltech AS, Norway (or with modified versions
	of Qt that use the same license as Qt), and distribute linked
	combinations including the two. You must obey the GNU General
	Public License in all respects for all of the code used other than
	Qt. If you modify this file, you may extend this exception to
	your version of the file, but you are not obligated to do so. If
	you do not wish to do so, delete this exception statement from
	your version.
	*/

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

	#include "qgpgmeencryptjob.h"

	#include "dataprovider.h"
	#include "encryptjob_p.h"
	#include "util.h"

	#include <gpgme++/context.h>
	#include <gpgme++/data.h>
	#include <gpgme++/encryptionresult.h>

	#include <QBuffer>
	#include <QFileInfo>

	#include <cassert>

	using namespace QGpgME;
	using namespace GpgME;

	namespace
	{

	class QGpgMEEncryptJobPrivate : public EncryptJobPrivate
	{
	QGpgMEEncryptJob *q = nullptr;

	public:
	QGpgMEEncryptJobPrivate(QGpgMEEncryptJob *qq)
	: q{qq}
	{
	}

	~QGpgMEEncryptJobPrivate() override = default;

	private:
	GpgME::Error startIt() override;

	void startNow() override
	{
	q->run();
	}
	};

	}

	QGpgMEEncryptJob::QGpgMEEncryptJob(Context *context)
	: mixin_type(context),
	mOutputIsBase64Encoded(false)
	{
	setJobPrivate(this, std::unique_ptr<QGpgMEEncryptJobPrivate>{new QGpgMEEncryptJobPrivate{this}});
	lateInitialization();
	}

	QGpgMEEncryptJob::~QGpgMEEncryptJob() {}

	void QGpgMEEncryptJob::setOutputIsBase64Encoded(bool on)
	{
	mOutputIsBase64Encoded = on;
	}

	static QGpgMEEncryptJob::result_type encrypt(Context ctx, QThread thread,
	const std::vector<Key> &recipients,
	const std::weak_ptr<QIODevice> &plainText_,
	const std::weak_ptr<QIODevice> &cipherText_,
	const Context::EncryptionFlags eflags,
	bool outputIsBsse64Encoded,
	Data::Encoding inputEncoding,
	const QString &fileName)
	{

	const std::shared_ptr<QIODevice> plainText = plainText_.lock();
	const std::shared_ptr<QIODevice> cipherText = cipherText_.lock();

	const _detail::ToThreadMover ctMover(cipherText, thread);
	const _detail::ToThreadMover ptMover(plainText, thread);

	QGpgME::QIODeviceDataProvider in(plainText);
	Data indata(&in);
	indata.setEncoding(inputEncoding);

	if (!plainText->isSequential()) {
	indata.setSizeHint(plainText->size());
	}

	const auto pureFileName = QFileInfo{fileName}.fileName().toStdString();
	if (!pureFileName.empty()) {
	indata.setFileName(pureFileName.c_str());
	}

	if (!cipherText) {
	QGpgME::QByteArrayDataProvider out;
	Data outdata(&out);

	if (outputIsBsse64Encoded) {
	outdata.setEncoding(Data::Base64Encoding);
	}

	const EncryptionResult res = ctx->encrypt(recipients, indata, outdata, eflags);
	Error ae;
	const QString log = _detail::audit_log_as_html(ctx, ae);
	return std::make_tuple(res, out.data(), log, ae);
	} else {
	QGpgME::QIODeviceDataProvider out(cipherText);
	Data outdata(&out);

	if (outputIsBsse64Encoded) {
	outdata.setEncoding(Data::Base64Encoding);
	}

	const EncryptionResult res = ctx->encrypt(recipients, indata, outdata, eflags);
	Error ae;
	const QString log = _detail::audit_log_as_html(ctx, ae);
	return std::make_tuple(res, QByteArray(), log, ae);
	}

	}

	static QGpgMEEncryptJob::result_type encrypt_qba(Context *ctx, const std::vector<Key> &recipients, const QByteArray &plainText, const Context::EncryptionFlags eflags, bool outputIsBsse64Encoded, Data::Encoding inputEncoding, const QString &fileName)
	{
	const std::shared_ptr<QBuffer> buffer(new QBuffer);
	buffer->setData(plainText);
	if (!buffer->open(QIODevice::ReadOnly)) {
	assert(!"This should never happen: QBuffer::open() failed");
	}
	return encrypt(ctx, nullptr, recipients, buffer, std::shared_ptr<QIODevice>(), eflags, outputIsBsse64Encoded, inputEncoding, fileName);
	}

	static QGpgMEEncryptJob::result_type encrypt_to_filename(Context *ctx,
	const std::vector<Key> &recipients,
	const QString &inputFilePath,
	const QString &outputFilePath,
	Context::EncryptionFlags flags)
	{
	Data indata;
	#ifdef Q_OS_WIN
	indata.setFileName(inputFilePath.toUtf8().constData());
	#else
	indata.setFileName(QFile::encodeName(inputFilePath).constData());
	#endif

	PartialFileGuard partFileGuard{outputFilePath};
	if (partFileGuard.tempFileName().isEmpty()) {
	return std::make_tuple(EncryptionResult{Error::fromCode(GPG_ERR_EEXIST)}, QByteArray{}, QString{}, Error{});
	}

	Data outdata;
	#ifdef Q_OS_WIN
	outdata.setFileName(partFileGuard.tempFileName().toUtf8().constData());
	#else
	outdata.setFileName(QFile::encodeName(partFileGuard.tempFileName()).constData());
	#endif

	flags = static_cast<Context::EncryptionFlags>(flags \| Context::EncryptFile);
	const auto encryptionResult = ctx->encrypt(recipients, indata, outdata, flags);

	if (!encryptionResult.error().code()) {
	// the operation succeeded -> save the result under the requested file name
	partFileGuard.commit();
	}

	Error ae;
	const QString log = _detail::audit_log_as_html(ctx, ae);
	return std::make_tuple(encryptionResult, QByteArray{}, log, ae);
	}

	Error QGpgMEEncryptJob::start(const std::vector<Key> &recipients, const QByteArray &plainText, bool alwaysTrust)
	{
	run(std::bind(&encrypt_qba, std::placeholders::_1, recipients, plainText,
	alwaysTrust ? Context::AlwaysTrust : Context::None, mOutputIsBase64Encoded, inputEncoding(), fileName()));
	return Error();
	}

	void QGpgMEEncryptJob::start(const std::vector<Key> &recipients, const std::shared_ptr<QIODevice> &plainText,
	const std::shared_ptr<QIODevice> &cipherText, const Context::EncryptionFlags eflags)
	{
	run(std::bind(&encrypt,
	std::placeholders::_1, std::placeholders::_2,
	recipients,
	std::placeholders::_3, std::placeholders::_4,
	eflags,
	mOutputIsBase64Encoded,
	inputEncoding(),
	fileName()),
	plainText, cipherText);
	}

	EncryptionResult QGpgMEEncryptJob::exec(const std::vector<Key> &recipients, const QByteArray &plainText,
	const Context::EncryptionFlags eflags, QByteArray &cipherText)
	{
	const result_type r = encrypt_qba(context(), recipients, plainText, eflags, mOutputIsBase64Encoded, inputEncoding(), fileName());
	cipherText = std::get<1>(r);
	return std::get<0>(r);
	}

	void QGpgMEEncryptJob::start(const std::vector<Key> &recipients, const std::shared_ptr<QIODevice> &plainText, const std::shared_ptr<QIODevice> &cipherText, bool alwaysTrust)
	{
	return start(recipients, plainText, cipherText, alwaysTrust ? Context::AlwaysTrust : Context::None);
	}

	EncryptionResult QGpgMEEncryptJob::exec(const std::vector<Key> &recipients, const QByteArray &plainText, bool alwaysTrust, QByteArray &cipherText)
	{
	return exec(recipients, plainText, alwaysTrust ? Context::AlwaysTrust : Context::None, cipherText);
	}

	GpgME::Error QGpgMEEncryptJobPrivate::startIt()
	{
	if (m_inputFilePath.isEmpty() \|\| m_outputFilePath.isEmpty()) {
	return Error::fromCode(GPG_ERR_INV_VALUE);
	}

	q->run([=](Context *ctx) {
	return encrypt_to_filename(ctx, m_recipients, m_inputFilePath, m_outputFilePath, m_encryptionFlags);
	});

	return {};
	}

	#include "qgpgmeencryptjob.moc"

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