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	diff --git a/packaging/GNU-Linux/appimage/build-unprivileged.sh b/packaging/GNU-Linux/appimage/build-unprivileged.sh
	new file mode 100755
	index 0000000..b23d1ec
	--- /dev/null
	+++ b/packaging/GNU-Linux/appimage/build-unprivileged.sh
	@@ -0,0 +1,9 @@
	+#!/bin/bash
	+
	+export XDG_RUNTIME_DIR=/run/user/test
	+
	+cmake .. -DCMAKE_INSTALL_PREFIX="$KAZV_INSTALL_DIR" \
	+ -DCMAKE_PREFIX_PATH="$LIBKAZV_INSTALL_DIR;$DEPS_INSTALL_DIR" -DCMAKE_BUILD_TYPE=$BUILD_TYPE -Dkazv_KF_QT_MAJOR_VERSION=$KF_VER -Dkazv_LINK_BREEZE_ICONS=ON && \
	+ make -j$JOBS && \
	+ make -j$JOBS DESTDIR=AppDir install && \
	+ dbus-launch --exit-with-session -- bash "$thisDir"/test.sh
	diff --git a/packaging/GNU-Linux/appimage/build.sh b/packaging/GNU-Linux/appimage/build.sh
	index 9146919..b47babe 100755
	--- a/packaging/GNU-Linux/appimage/build.sh
	+++ b/packaging/GNU-Linux/appimage/build.sh
	@@ -1,112 +1,111 @@
	#!/bin/bash

	set -x
	set -e

	+export thisDir="$(readlink -f "$(dirname "$(realpath "$0")")")"
	+
	# Collect deps
	wget https://raw.githubusercontent.com/KDE/docker-neon/Neon/stable/public.key && \
	apt-key add public.key && \
	rm public.key

	DEP_PACKAGES=(
	extra-cmake-modules
	wget
	weston
	dbus-x11
	libcmark-dev
	)

	if [[ $KF_VER == 5 ]]; then
	echo "Building on KF5 is no longer supported."
	exit 1
	else
	DEP_PACKAGES+=(
	qt6-base-dev
	qt6-declarative-dev
	qt6-multimedia-dev
	qt6-imageformats
	qml6-module-qtmultimedia
	libqt6concurrent6
	libqt6gui6
	libqt6svg6-dev
	libqt6quickcontrols2-6
	qml6-module-qtquick-controls
	qml6-module-qtquick-layouts
	qml6-module-qt-labs-qmlmodels
	kf6-kirigami2-dev
	libkf6config-dev
	qt6-gtk-platformtheme
	plasma-integration
	libkf6kio-dev
	qml6-module-qttest
	qml6-module-qt-labs-platform
	libkf6notifications-dev
	qml6-module-qtquick-dialogs
	qml6-module-org-kde-notification
	kf6-kirigami-addons-dev
	kf6-kcoreaddons-dev
	qml6-module-org-kde-qqc2desktopstyle
	kf6-qqc2-desktop-style-dev
	kf6-breeze-icon-theme-dev
	cmark
	)
	export QMAKE=qmake6
	cp -v packaging/GNU-Linux/appimage/kde-neon-jammy.list /etc/apt/sources.list.d/
	fi

	apt-get update && \
	apt-get -y upgrade && \
	DEBIAN_FRONTEND="noninteractive" \
	apt-get -y install aptitude && \
	aptitude -y install "${DEP_PACKAGES[@]}"

	-# Actual build
	-mkdir -pv /run/user/test
	-export XDG_RUNTIME_DIR=/run/user/test
	-
	-thisDir="$(readlink -f "$(dirname "$(realpath "$0")")")"
	-
	-BUILD_TYPE="$1"
	+export BUILD_TYPE="$1"
	if [[ ! "$BUILD_TYPE" ]]; then
	export BUILD_TYPE=Debug
	fi
	+
	+useradd -U builder
	+mkdir build
	+chown builder:builder build
	+cd build
	+
	export JOBS=${JOBS:-$(( $(nproc) / 2))} DEPS_INSTALL_DIR=/opt/libkazv-deps LIBKAZV_INSTALL_DIR=/opt/libkazv KAZV_INSTALL_DIR=/usr

	export LD_LIBRARY_PATH="$LIBKAZV_INSTALL_DIR/lib:$LIBKAZV_INSTALL_DIR/lib/x86_64-linux-gnu:$DEPS_INSTALL_DIR/lib:$DEPS_INSTALL_DIR/lib/x86_64-linux-gnu"

	-mkdir build && cd build && \
	- cmake .. -DCMAKE_INSTALL_PREFIX="$KAZV_INSTALL_DIR" \
	- -DCMAKE_PREFIX_PATH="$LIBKAZV_INSTALL_DIR;$DEPS_INSTALL_DIR" -DCMAKE_BUILD_TYPE=$BUILD_TYPE -Dkazv_KF_QT_MAJOR_VERSION=$KF_VER -Dkazv_LINK_BREEZE_ICONS=ON && \
	- make -j$JOBS && \
	- make -j$JOBS DESTDIR=AppDir install && \
	- dbus-launch --exit-with-session -- bash "$thisDir"/test.sh
	+mkdir -pv /run/user/test
	+chown builder:builder /run/user/test
	+su builder -c "$thisDir"/build-unprivileged.sh \|\| exit 1

	wget https://github.com/linuxdeploy/linuxdeploy/releases/download/continuous/linuxdeploy-x86_64.AppImage
	wget https://github.com/linuxdeploy/linuxdeploy-plugin-qt/releases/download/continuous/linuxdeploy-plugin-qt-x86_64.AppImage

	chmod +x linuxdeploy*.AppImage

	export QML_SOURCES_PATHS=../src
	./linuxdeploy-plugin-qt-x86_64.AppImage --appimage-extract
	./linuxdeploy-x86_64.AppImage --appimage-extract

	# https://github.com/linuxdeploy/linuxdeploy/issues/154
	mv -v ./linuxdeploy-plugin-qt-x86_64.AppImage ./linuxdeploy-notplugin-qt-x86_64.AppImage

	# Enable the appimage to use Plasma themes, linuxdeploy-plugin-qt will only copy the gtk3 plugin -((
	mkdir -pv AppDir/usr/plugins/platformthemes/
	cp /usr/lib/x86_64-linux-gnu/qt6/plugins/platformthemes/KDEPlasmaPlatformTheme6.so AppDir/usr/plugins/platformthemes/ \|\| true
	mkdir -pv AppDir/usr/qml/org/kde
	cp -rv /usr/lib/x86_64-linux-gnu/qt6/qml/org/kde/desktop AppDir/usr/qml/org/kde
	cp -rv /usr/lib/x86_64-linux-gnu/qt6/qml/org/kde/qqc2desktopstyle AppDir/usr/qml/org/kde
	mkdir -pv AppDir/usr/plugins/kf6/kirigami/platform
	cp -v /usr/lib/x86_64-linux-gnu/qt6/plugins/kf6/kirigami/platform/org.kde.desktop.so AppDir/usr/plugins/kf6/kirigami/platform/

	# Workaround "cannot mix incompatible qt versions" problem

	mkdir -pv AppDir/apprun-hooks/
	cp -v "$thisDir"/hooks/*.sh AppDir/apprun-hooks/

	./squashfs-root/AppRun --appdir AppDir -i ../icons/kazvlogo-256.png --plugin qt --output appimage # -l /lib/x86_64-linux-gnu/libstdc++.so.6

	cp kazv*.AppImage ../kazv-"$BUILD_TYPE".AppImage
	diff --git a/src/matrix-sdk.cpp b/src/matrix-sdk.cpp
	index 6988382..f3160e0 100644
	--- a/src/matrix-sdk.cpp
	+++ b/src/matrix-sdk.cpp
	@@ -1,757 +1,772 @@
	/*
	* This file is part of kazv.
	* SPDX-FileCopyrightText: 2020-2024 tusooa <tusooa@kazv.moe>
	* SPDX-License-Identifier: AGPL-3.0-or-later
	*/

	#include <kazv-defs.hpp>

	#include <boost/archive/text_oarchive.hpp>
	#include <boost/archive/text_iarchive.hpp>
	#include <fstream>
	#include <filesystem>
	#include <chrono>

	#include <QMutex>
	#include <QMutexLocker>
	#include <QtConcurrent>
	#include <QThreadPool>

	#include <KConfig>
	#include <KConfigGroup>

	#include <eventemitter/lagerstoreeventemitter.hpp>
	#include <client/sdk.hpp>
	#include <client/notification-handler.hpp>
	#include <crypto/base64.hpp>

	#include <zug/util.hpp>
	#include <lager/event_loop/qt.hpp>

	#include "matrix-sdk.hpp"
	#include "matrix-room-list.hpp"
	#include "matrix-promise.hpp"
	#include "matrix-event.hpp"
	#include "helper.hpp"
	#include "kazv-path-config.hpp"
	#include "kazv-version.hpp"
	#include "qt-json.hpp"
	#include "qt-rand-adapter.hpp"
	#include "qt-promise-handler.hpp"
	#include "qt-job-handler.hpp"
	#include "device-mgmt/matrix-device-list.hpp"
	#include "matrix-sticker-pack-list.hpp"
	#include "matrix-sticker-pack-list-p.hpp"
	#include "matrix-user-given-attrs-map.hpp"
	#include "kazv-log.hpp"
	#include "matrix-utils.hpp"
	#include "kazv-session-lock-guard.hpp"

	using namespace Qt::Literals::StringLiterals;
	using namespace Kazv;

	// Sdk with qt event loop, identity transform and no enhancers
	using SdkT =
	decltype(makeSdk(
	SdkModel{},
	detail::declref<JobInterface>(),
	detail::declref<EventInterface>(),
	QtPromiseHandler(detail::declref<QObject>()),
	zug::identity,
	withRandomGenerator(detail::declref<RandomInterface>())));

	struct QtEventLoop
	{
	QObject *m_obj;

	template<class Fn>
	void async(Fn &&) { throw std::runtime_error{"not implemented!"}; }

	template<class Fn>
	void post(Fn &&fn)
	{
	QMetaObject::invokeMethod(
	m_obj, std::forward<Fn>(fn), Qt::QueuedConnection
	);
	}

	void finish() {}
	void pause() { throw std::runtime_error{"not implemented!"}; }
	void resume() { throw std::runtime_error{"not implemented!"}; }
	};

	+std::filesystem::path sessionDirForUserAndDeviceId(std::filesystem::path userDataDir, std::string userId, std::string deviceId)
	+{
	+ auto encodedUserId = encodeBase64(userId, Base64Opts::urlSafe);
	+ auto sessionDir = userDataDir / "sessions"
	+ / encodedUserId / deviceId;
	+ return sessionDir;
	+}
	+
	struct MatrixSdkPrivate
	{
	MatrixSdkPrivate(MatrixSdk *q, bool testing, std::unique_ptr<KazvSessionLockGuard> lockGuard);
	MatrixSdkPrivate(MatrixSdk *q, bool testing, SdkModel model, std::unique_ptr<KazvSessionLockGuard> lockGuard);
	bool testing;
	std::string userDataDir;
	std::unique_ptr<KazvSessionLockGuard> lockGuard;
	RandomInterface randomGenerator;
	QThread *thread;
	QObject *obj;
	QtJobHandler *jobHandler;
	LagerStoreEventEmitter ee;
	LagerStoreEventEmitter::Watchable watchable;
	SdkT sdk;
	QTimer saveTimer;

	using SecondaryRootT = decltype(sdk.createSecondaryRoot(std::declval<lager::with_qt_event_loop>()));
	SecondaryRootT secondaryRoot;
	Client clientOnSecondaryRoot;
	NotificationHandler notificationHandler;
	void runIoContext() {
	thread->start();
	}
	void stopIoContext() {
	thread->quit();
	}

	void maybeSerialize()
	{
	if (!testing) {
	serializeClientToFile(clientOnSecondaryRoot);
	}
	}

	void serializeClientToFile(Client c);
	};

	// Cleaning up notes:
	// 0. Callback functions may store the context for an indefinite time
	// 1. The QThread event loop can be stopped
	// 2. QtJobHandler::submit() should only happen in the primary event loop thread
	// 3. QtJobHandler lives in the primary event loop thread
	// 4. QtJobs live in the primary event loop thread
	// 5. Job callbacks are called in the primary event loop thread
	// 6. QtPromise::then() callbacks are called in the primary event loop thread
	// 7. When the QThread event loop stops, no more callbacks will be executed (there is nothing to post to)
	// 8. The QThread should stop before obj is deleted
	class CleanupHelper : public QObject
	{
	Q_OBJECT
	public:
	explicit CleanupHelper(std::unique_ptr<MatrixSdkPrivate> d)
	: oldD(std::move(d))
	{
	}

	std::unique_ptr<MatrixSdkPrivate> oldD;

	void cleanup()
	{
	qCInfo(kazvLog) << "start to clean up everything";
	oldD->clientOnSecondaryRoot.stopSyncing()
	.then([obj=oldD->obj, thread=oldD->thread](auto &&) {
	qCDebug(kazvLog) << "stopped syncing";
	QMetaObject::invokeMethod(obj, [thread]() {
	thread->quit();
	});
	});
	oldD->thread->wait();
	oldD->thread->deleteLater();
	// After the thread's event loop is finished, we can delete the root object
	oldD->obj->deleteLater();
	this->deleteLater();
	qCInfo(kazvLog) << "thread is done";
	}
	};

	void MatrixSdkPrivate::serializeClientToFile(Client c)
	{
	using namespace Kazv::CursorOp;
	auto userId = +c.userId();
	auto deviceId = +c.deviceId();
	if (userId.empty() \|\| deviceId.empty()) {
	qDebug() << "Not logged in, nothing to serialize";
	return;
	}

	using StdPath = std::filesystem::path;
	auto userDataDir = StdPath(this->userDataDir);
	- auto encodedUserId = encodeBase64(userId, Base64Opts::urlSafe);
	- auto sessionDir = userDataDir / "sessions"
	- / encodedUserId / deviceId;
	+ auto sessionDir = sessionDirForUserAndDeviceId(userDataDir, userId, deviceId);

	auto storeFile = sessionDir / "store";
	+ auto storeFileNew = sessionDir / "store.new";

	auto metadataFile = sessionDir / "metadata";

	qDebug() << "storeFile=" << QString::fromStdString(storeFile.string());

	std::error_code err;
	if ((! std::filesystem::create_directories(sessionDir, err))
	&& err) {
	qDebug() << "Unable to create sessionDir";
	return;
	}

	if (!lockGuard) {
	try {
	lockGuard = std::make_unique<KazvSessionLockGuard>(sessionDir);
	} catch (const std::runtime_error &e) {
	qCWarning(kazvLog) << "Error locking session: " << e.what();
	return;
	}
	}

	- {
	- auto storeStream = std::ofstream(storeFile);
	+ try {
	+ auto storeStream = std::ofstream(storeFileNew);
	if (! storeStream) {
	- qDebug() << "Unable to open storeFile";
	+ qCWarning(kazvLog) << "Unable to open storeFile";
	return;
	}
	using OAr = boost::archive::text_oarchive;
	auto archive = OAr{storeStream};
	c.serializeTo(archive);
	- qDebug() << "Serialization done";
	+ } catch (const std::exception &e) {
	+ qCWarning(kazvLog) << "Cannot write to store file: " << e.what();
	+ return;
	}

	+ err.clear();
	+ std::filesystem::rename(storeFileNew, storeFile, err);
	+ if (err) {
	+ qCWarning(kazvLog) << "Cannot move storeFile into place: " << QString::fromStdString(err.message());
	+ return;
	+ }
	+ qDebug() << "Serialization done";
	+
	+
	// store metadata
	{
	KConfig metadata(QString::fromStdString(metadataFile.string()));
	KConfigGroup mdGroup(&metadata, u"Metadata"_s);
	mdGroup.writeEntry("kazvVersion", QString::fromStdString(kazvVersionString()));
	mdGroup.writeEntry("archiveFormat", "text");
	}
	}

	MatrixSdkPrivate::MatrixSdkPrivate(MatrixSdk *q, bool testing, std::unique_ptr<KazvSessionLockGuard> lockGuard)
	: testing(testing)
	, userDataDir{kazvUserDataDir().toStdString()}
	, lockGuard(std::move(lockGuard))
	, randomGenerator(QtRandAdapter{})
	, thread(new QThread())
	, obj(new QObject())
	, jobHandler(new QtJobHandler(obj))
	, ee{QtEventLoop{obj}}
	, watchable(ee.watchable())
	, sdk(makeDefaultSdkWithCryptoRandom(
	randomGenerator.generateRange<std::string>(makeDefaultSdkWithCryptoRandomSize()),
	static_cast<JobInterface &>(*jobHandler),
	static_cast<EventInterface &>(ee),
	QtPromiseHandler(*obj),
	zug::identity,
	withRandomGenerator(randomGenerator)))
	, secondaryRoot(sdk.createSecondaryRoot(QtEventLoop{q}))
	, clientOnSecondaryRoot(sdk.clientFromSecondaryRoot(secondaryRoot))
	, notificationHandler(clientOnSecondaryRoot.notificationHandler())
	{
	obj->moveToThread(thread);
	}

	MatrixSdkPrivate::MatrixSdkPrivate(MatrixSdk *q, bool testing, SdkModel model, std::unique_ptr<KazvSessionLockGuard> lockGuard)
	: testing(testing)
	, userDataDir{kazvUserDataDir().toStdString()}
	, lockGuard(std::move(lockGuard))
	, randomGenerator(QtRandAdapter{})
	, thread(new QThread())
	, obj(new QObject())
	, jobHandler(new QtJobHandler(obj))
	, ee{QtEventLoop{obj}}
	, watchable(ee.watchable())
	, sdk(makeSdk(
	model,
	static_cast<JobInterface &>(*jobHandler),
	static_cast<EventInterface &>(ee),
	QtPromiseHandler(*obj),
	zug::identity,
	withRandomGenerator(randomGenerator)))
	, secondaryRoot(sdk.createSecondaryRoot(QtEventLoop{q}, std::move(model)))
	, clientOnSecondaryRoot(sdk.clientFromSecondaryRoot(secondaryRoot))
	, notificationHandler(clientOnSecondaryRoot.notificationHandler())
	{
	obj->moveToThread(thread);
	}

	MatrixSdk::MatrixSdk(std::unique_ptr<MatrixSdkPrivate> d, QObject *parent)
	: QObject(parent)
	, m_userDataDir(kazvUserDataDir())
	, m_d(std::move(d))
	{
	init();
	connect(this, &MatrixSdk::trigger,
	this, [](KazvEvent e) {
	qDebug() << "receiving trigger:";
	if (std::holds_alternative<LoginSuccessful>(e)) {
	qDebug() << "Login successful";
	}
	});
	}

	void MatrixSdk::init()
	{
	LAGER_QT(serverUrl) = m_d->clientOnSecondaryRoot.serverUrl().xform(strToQt); Q_EMIT serverUrlChanged(serverUrl());
	LAGER_QT(userId) = m_d->clientOnSecondaryRoot.userId().xform(strToQt); Q_EMIT userIdChanged(userId());
	LAGER_QT(token) = m_d->clientOnSecondaryRoot.token().xform(strToQt); Q_EMIT tokenChanged(token());
	LAGER_QT(deviceId) = m_d->clientOnSecondaryRoot.deviceId().xform(strToQt); Q_EMIT deviceIdChanged(deviceId());

	m_d->watchable.afterAll(
	[this](KazvEvent e) {
	Q_EMIT this->trigger(e);
	});

	m_d->watchable.after<LoginSuccessful>(
	[this](LoginSuccessful e) {
	Q_EMIT this->loginSuccessful(e);
	});

	m_d->watchable.after<LoginFailed>(
	[this](LoginFailed e) {
	Q_EMIT this->loginFailed(
	QString::fromStdString(e.errorCode),
	QString::fromStdString(e.error)
	);
	});

	m_d->watchable.after<ReceivingRoomTimelineEvent>(
	[this](ReceivingRoomTimelineEvent e) {
	Q_EMIT this->receivedMessage(
	QString::fromStdString(e.roomId),
	QString::fromStdString(e.event.id())
	);
	});

	connect(&m_d->saveTimer, &QTimer::timeout, &m_d->saveTimer, [m_d=m_d.get()]() {
	m_d->maybeSerialize();
	});
	const int saveIntervalMs = 1000 * 60 * 5;
	m_d->saveTimer.start(std::chrono::milliseconds{saveIntervalMs});
	}

	MatrixSdk::MatrixSdk(QObject *parent)
	: MatrixSdk(std::make_unique<MatrixSdkPrivate>(this, /* testing = */ false, std::unique_ptr<KazvSessionLockGuard>()), parent)
	{
	}

	MatrixSdk::MatrixSdk(SdkModel model, bool testing, QObject *parent)
	: MatrixSdk(std::make_unique<MatrixSdkPrivate>(this, testing, std::move(model), std::unique_ptr<KazvSessionLockGuard>()), parent)
	{
	}

	static void cleanupDPointer(std::unique_ptr<MatrixSdkPrivate> oldD)
	{
	oldD->saveTimer.disconnect();
	oldD->saveTimer.stop();

	auto helper = new CleanupHelper(std::move(oldD));
	helper->cleanup();
	}

	MatrixSdk::~MatrixSdk()
	{
	if (m_d) {
	serializeToFile();
	cleanupDPointer(std::move(m_d));
	}
	}

	QString MatrixSdk::mxcUriToHttp(QString mxcUri) const
	{
	return QString::fromStdString(m_d->clientOnSecondaryRoot.mxcUriToHttp(mxcUri.toStdString()));
	}

	MatrixDeviceList *MatrixSdk::devicesOfUser(QString userId) const
	{
	return new MatrixDeviceList(m_d->clientOnSecondaryRoot.devicesOfUser(userId.toStdString()));
	}

	void MatrixSdk::login(const QString &userId, const QString &password)
	{
	m_d->clientOnSecondaryRoot
	.autoDiscover(userId.toStdString())
	.then([
	this,
	client=m_d->clientOnSecondaryRoot.toEventLoop(),
	userId,
	password
	](auto res) {
	if (!res.success()) {
	// FIXME use real error codes and msgs when available in libkazv
	Q_EMIT this->discoverFailed(u""_s, u""_s);
	return res;
	}

	auto serverUrl = res.dataStr("homeserverUrl");

	client.passwordLogin(
	serverUrl,
	userId.toStdString(),
	password.toStdString(),
	"kazv"
	);

	return res;
	});
	m_d->runIoContext();
	}
	void MatrixSdk::logout()
	{
	m_d->clientOnSecondaryRoot.logout()
	.then([&] (EffectStatus stat) {
	if (stat.success()) {
	m_d->stopIoContext();
	Q_EMIT this->logoutSuccessful();
	} else {
	Q_EMIT this->logoutFailed(QString::fromStdString(stat.dataStr("errorCode")), QString::fromStdString(stat.dataStr("error")));
	}
	});
	}

	MatrixRoomList *MatrixSdk::roomList() const
	{
	return new MatrixRoomList(m_d->clientOnSecondaryRoot);
	}

	void MatrixSdk::emplace(std::optional<SdkModel> model, std::unique_ptr<KazvSessionLockGuard> lockGuard)
	{
	auto testing = m_d->testing;
	auto userDataDir = m_d->userDataDir;

	if (m_d) {
	cleanupDPointer(std::move(m_d));
	}

	m_d = (model.has_value()
	? std::make_unique<MatrixSdkPrivate>(this, testing, std::move(model.value()), std::move(lockGuard))
	: std::make_unique<MatrixSdkPrivate>(this, testing, std::move(lockGuard)));
	m_d->userDataDir = userDataDir;

	// Re-initialize lager-qt cursors and watchable connections
	init();

	m_d->runIoContext();

	m_d->clientOnSecondaryRoot.startSyncing();

	Q_EMIT sessionChanged();
	}

	QStringList MatrixSdk::allSessions() const
	{
	using StdPath = std::filesystem::path;
	auto userDataDir = StdPath(m_d->userDataDir);
	auto allSessionsDir = userDataDir / "sessions";

	QStringList sessionNames;

	try {
	for (const auto &p : std::filesystem::directory_iterator(allSessionsDir)) {
	if (p.is_directory()) {
	auto maybeEncodedUserId = p.path().filename().string();
	auto userId = decodeBase64(maybeEncodedUserId, Base64Opts::urlSafe);
	if (userId.empty() \|\| userId[0] != '@') {
	continue;
	}
	for (const auto &q : std::filesystem::directory_iterator(p.path())) {
	auto path = q.path();
	auto deviceId = path.filename().string();
	std::error_code err;
	if (std::filesystem::exists(path / "store", err)) {
	sessionNames.append(QString::fromStdString(userId + "/" + deviceId));
	}
	}
	}
	}
	} catch (const std::filesystem::filesystem_error &) {
	qDebug() << "sessionDir not available, ignoring";
	}

	return sessionNames;
	}

	void MatrixSdk::serializeToFile() const
	{
	m_d->maybeSerialize();
	}

	auto MatrixSdk::loadSession(QString sessionName) -> LoadSessionResult
	{
	using StdPath = std::filesystem::path;
	std::unique_ptr<KazvSessionLockGuard> lockGuard;
	auto loadFromSession = [this, sessionName, &lockGuard](StdPath sessionDir) {
	auto storeFile = sessionDir / "store";

	auto metadataFile = sessionDir / "metadata";

	if (! std::filesystem::exists(storeFile)) {
	qDebug() << "storeFile does not exist, skip loading session " << sessionName;
	return SessionNotFound;
	}

	if (std::filesystem::exists(metadataFile)) {
	KConfig metadata(QString::fromStdString(metadataFile.string()));
	KConfigGroup mdGroup(&metadata, u"Metadata"_s);
	auto format = mdGroup.readEntry(u"archiveFormat"_s);
	if (format != QStringLiteral("text")) {
	qDebug() << "Unknown archive format:" << format;
	return SessionFormatUnknown;
	}
	auto version = mdGroup.readEntry(u"kazvVersion"_s);
	auto curVersion = kazvVersionString();
	if (version != QString::fromStdString(curVersion)) {
	qDebug() << "A different version from the current one, making a backup";
	std::error_code err;
	auto now = std::chrono::system_clock::now();
	auto backupName =
	std::to_string(std::chrono::duration_cast<std::chrono::seconds>(now.time_since_epoch()).count());
	auto backupDir = sessionDir / "backup" / backupName;
	if (! std::filesystem::create_directories(backupDir, err)
	&& err) {
	qDebug() << "Cannot create backup directory";
	return SessionCannotBackup;
	}
	std::filesystem::copy_file(storeFile, backupDir / "store");
	std::filesystem::copy_file(metadataFile, backupDir / "metadata");
	}
	}

	SdkModel model;
	try {
	auto storeStream = std::ifstream(storeFile);
	if (! storeStream) {
	qDebug() << "Unable to open storeFile";
	return SessionCannotOpenFile;
	}
	using IAr = boost::archive::text_iarchive;
	auto archive = IAr{storeStream};
	archive >> model;
	qDebug() << "Finished loading session";
	} catch (const std::exception &e) {
	qDebug() << "Error when loading session:" << QString::fromStdString(e.what());
	return SessionDeserializeFailed;
	}
	emplace(std::move(model), std::move(lockGuard));
	return SessionLoadSuccess;
	};

	qDebug() << "in loadSession(), sessionName=" << sessionName;
	auto userDataDir = StdPath(m_d->userDataDir);
	auto parts = sessionName.split(u'/');
	if (parts.size() == 2) {
	auto userId = parts[0].toStdString();
	- auto sessionId = parts[1].toStdString();
	- auto encodedUserId = encodeBase64(userId, Base64Opts::urlSafe);
	- auto sessionDir = userDataDir / "sessions" / encodedUserId / sessionId;
	+ auto deviceId = parts[1].toStdString();
	+ auto sessionDir = sessionDirForUserAndDeviceId(userDataDir, userId, deviceId);
	try {
	lockGuard = std::make_unique<KazvSessionLockGuard>(sessionDir);
	} catch (const std::runtime_error &e) {
	qCWarning(kazvLog) << "Error locking session: " << e.what();
	return SessionLockFailed;
	}
	return loadFromSession(sessionDir);
	}
	qDebug(kazvLog) << "no session found for" << sessionName;
	return SessionNotFound;
	}

	bool MatrixSdk::deleteSession(QString sessionName) {
	using StdPath = std::filesystem::path;
	qDebug() << "in deleteSession(), sessionName=" << sessionName;
	auto userDataDir = StdPath(kazvUserDataDir().toStdString());
	auto parts = sessionName.split(u'/');
	if (parts.size() == 2) {
	auto userId = parts[0].toStdString();
	- auto sessionId = parts[1].toStdString();
	- auto encodedUserId = encodeBase64(userId, Base64Opts::urlSafe);
	- qCDebug(kazvLog) << "trying new path";
	- auto sessionDir = userDataDir / "sessions" / encodedUserId / sessionId;
	+ auto deviceId = parts[1].toStdString();
	+ auto sessionDir = sessionDirForUserAndDeviceId(userDataDir, userId, deviceId);
	if (std::filesystem::exists(sessionDir)) {
	qCDebug(kazvLog) << "new path works";
	return std::filesystem::remove_all(sessionDir);
	}
	qCDebug(kazvLog) << "trying legacy path";
	- auto legacySessionDir = userDataDir / "sessions" / userId / sessionId;
	+ auto legacySessionDir = userDataDir / "sessions" / userId / deviceId;
	if (std::filesystem::exists(legacySessionDir)) {
	qCDebug(kazvLog) << "legacy path works";
	return std::filesystem::remove_all(legacySessionDir);
	}
	}
	qDebug(kazvLog) << "no session found for" << sessionName;
	return false;
	}

	bool MatrixSdk::startNewSession()
	{
	emplace(std::nullopt, std::unique_ptr<KazvSessionLockGuard>());
	return true;
	}

	static std::optional<std::string> optMaybe(QString s)
	{
	if (s.isEmpty()) {
	return std::nullopt;
	} else {
	return s.toStdString();
	}
	}

	MatrixPromise *MatrixSdk::createRoom(
	bool isPrivate,
	const QString &name,
	const QString &alias,
	const QStringList &invite,
	bool isDirect,
	bool allowFederate,
	const QString &topic,
	const QJsonValue &powerLevelContentOverride,
	CreateRoomPreset preset,
	bool encrypted
	)
	{
	immer::array<Event> initialState;

	if (encrypted) {
	initialState = {Event{json{
	{"type", "m.room.encryption"},
	{"state_key", ""},
	{"content", {
	{"algorithm", "m.megolm.v1.aes-sha2"},
	}},
	}}};
	}

	return new MatrixPromise(m_d->clientOnSecondaryRoot.createRoom(
	isPrivate ? Kazv::RoomVisibility::Private : Kazv::RoomVisibility::Public,
	optMaybe(name),
	optMaybe(alias),
	qStringListToStdF(invite),
	isDirect,
	allowFederate,
	optMaybe(topic),
	nlohmann::json(powerLevelContentOverride),
	static_cast<Kazv::CreateRoomPreset>(preset),
	initialState
	));
	}

	MatrixPromise *MatrixSdk::joinRoom(const QString &idOrAlias, const QStringList &servers)
	{
	return new MatrixPromise(m_d->clientOnSecondaryRoot.joinRoom(
	idOrAlias.toStdString(),
	qStringListToStdF(servers)
	));
	}

	MatrixPromise *MatrixSdk::setDeviceTrustLevel(QString userId, QString deviceId, QString trustLevel)
	{
	return new MatrixPromise(
	m_d->clientOnSecondaryRoot.setDeviceTrustLevel(
	userId.toStdString(),
	deviceId.toStdString(),
	qStringToTrustLevelFunc(trustLevel)
	)
	);
	}

	MatrixPromise *MatrixSdk::getSelfProfile()
	{
	return new MatrixPromise(
	m_d->clientOnSecondaryRoot.getProfile(userId().toStdString())
	);
	}

	MatrixPromise *MatrixSdk::setDisplayName(QString displayName)
	{
	return new MatrixPromise(
	m_d->clientOnSecondaryRoot.setDisplayName(
	displayName.isEmpty() ? std::nullopt : std::optional<std::string>(displayName.toStdString())
	)
	);
	}

	MatrixPromise *MatrixSdk::setAvatarUrl(QString avatarUrl)
	{
	return new MatrixPromise(
	m_d->clientOnSecondaryRoot.setAvatarUrl(
	avatarUrl.isEmpty() ? std::nullopt : std::optional<std::string>(avatarUrl.toStdString())
	)
	);
	}

	void MatrixSdk::startThread()
	{
	m_d->runIoContext();
	}

	RandomInterface &MatrixSdk::randomGenerator() const
	{
	return m_d->randomGenerator;
	}

	bool MatrixSdk::shouldNotify(MatrixEvent *event) const
	{
	// Do not notify own event
	if (event->sender() == userId()) {
	return false;
	}
	return m_d->notificationHandler.handleNotification(event->underlyingEvent()).shouldNotify;
	}

	bool MatrixSdk::shouldPlaySound(MatrixEvent *event) const
	{
	return m_d->notificationHandler.handleNotification(event->underlyingEvent()).sound.has_value();
	}

	MatrixStickerPackList *MatrixSdk::stickerPackList() const
	{
	return new MatrixStickerPackList(m_d->clientOnSecondaryRoot);
	}

	MatrixEvent *MatrixSdk::stickerRoomsEvent() const
	{
	return new MatrixEvent(m_d->clientOnSecondaryRoot.accountData()[imagePackRoomsEventType][lager::lenses::or_default]);
	}

	MatrixPromise *MatrixSdk::updateStickerPack(MatrixStickerPackSource source)
	{
	if (source.source == MatrixStickerPackSource::AccountData) {
	auto eventJson = std::move(source.event).raw().get();
	eventJson["type"] = source.eventType;
	return sendAccountDataImpl(Event(std::move(eventJson)));
	} else if (source.source == MatrixStickerPackSource::RoomState) {
	auto eventJson = std::move(source.event).raw().get();
	eventJson["type"] = source.eventType;
	eventJson["state_key"] = source.stateKey;
	return new MatrixPromise(
	m_d->clientOnSecondaryRoot
	.room(source.roomId)
	.sendStateEvent(Event(std::move(eventJson))));
	} else {
	return 0;
	}
	}

	MatrixUserGivenAttrsMap *MatrixSdk::userGivenNicknameMap() const
	{
	return new MatrixUserGivenAttrsMap(
	userGivenNicknameMapFor(m_d->clientOnSecondaryRoot),
	[client=m_d->clientOnSecondaryRoot](json content) {
	return client.setAccountData(json{
	{"type", USER_GIVEN_NICKNAME_EVENT_TYPES[0]},
	{"content", std::move(content)},
	});
	}
	);
	}

	MatrixPromise *MatrixSdk::sendAccountData(const QString &type, const QJsonObject &content)
	{
	Event e = json{
	{"type", type.toStdString()},
	{"content", content},
	};
	return sendAccountDataImpl(std::move(e));
	}

	MatrixPromise *MatrixSdk::sendAccountDataImpl(Event event)
	{
	return new MatrixPromise(m_d->clientOnSecondaryRoot.setAccountData(event));
	}

	void MatrixSdk::setUserDataDir(const std::string &userDataDir)
	{
	m_d->userDataDir = userDataDir;
	}

	#include "matrix-sdk.moc"
	diff --git a/src/matrix-sdk.hpp b/src/matrix-sdk.hpp
	index be74b02..666ba76 100644
	--- a/src/matrix-sdk.hpp
	+++ b/src/matrix-sdk.hpp
	@@ -1,288 +1,291 @@
	/*
	* This file is part of kazv.
	* SPDX-FileCopyrightText: 2020-2023 tusooa <tusooa@kazv.moe>
	* SPDX-License-Identifier: AGPL-3.0-or-later
	*/

	#pragma once
	#include <kazv-defs.hpp>

	#include <QObject>
	#include <QQmlEngine>
	#include <QString>

	#include <memory>
	+#include <filesystem>

	#include <lager/extra/qt.hpp>

	#include <sdk-model.hpp>
	#include <random-generator.hpp>

	#include "meta-types.hpp"
	Q_MOC_INCLUDE("matrix-room-list.hpp")
	Q_MOC_INCLUDE("matrix-device-list.hpp")
	Q_MOC_INCLUDE("matrix-promise.hpp")
	Q_MOC_INCLUDE("matrix-event.hpp")
	Q_MOC_INCLUDE("matrix-sticker-pack-list.hpp")
	Q_MOC_INCLUDE("matrix-user-given-attrs-map.hpp")

	class MatrixRoomList;
	class MatrixDeviceList;
	class MatrixPromise;
	class MatrixSdkTest;
	class MatrixSdkSessionsTest;
	class MatrixEvent;
	class MatrixStickerPackList;
	class MatrixUserGivenAttrsMap;
	class KazvSessionLockGuard;

	struct MatrixSdkPrivate;

	+std::filesystem::path sessionDirForUserAndDeviceId(std::filesystem::path userDataDir, std::string userId, std::string deviceId);
	+
	class MatrixSdk : public QObject
	{
	Q_OBJECT
	QML_ELEMENT

	QString m_userDataDir;
	std::unique_ptr<MatrixSdkPrivate> m_d;

	/// @param d A dynamically allocated d-pointer, whose ownership
	/// will be transferred to this MatrixSdk.
	explicit MatrixSdk(std::unique_ptr<MatrixSdkPrivate> d, QObject *parent);

	void init();

	public:
	enum CreateRoomPreset {
	PrivateChat = Kazv::CreateRoomPreset::PrivateChat,
	PublicChat = Kazv::CreateRoomPreset::PublicChat,
	TrustedPrivateChat = Kazv::CreateRoomPreset::TrustedPrivateChat,
	};

	Q_ENUM(CreateRoomPreset);

	enum LoadSessionResult {
	/// Successfully loaded the session
	SessionLoadSuccess,
	/// There is no store file
	SessionNotFound,
	/// The format of the store file is not supported
	SessionFormatUnknown,
	/// The store file cannot be backed up
	SessionCannotBackup,
	/// Cannot grab the lock on the session file
	SessionLockFailed,
	/// Cannot open store file
	SessionCannotOpenFile,
	/// Cannot deserialize the store file
	SessionDeserializeFailed,
	};

	Q_ENUM(LoadSessionResult);

	explicit MatrixSdk(QObject *parent = 0);
	~MatrixSdk() override;

	LAGER_QT_READER(QString, serverUrl);
	LAGER_QT_READER(QString, userId);
	LAGER_QT_READER(QString, token);
	LAGER_QT_READER(QString, deviceId);

	Q_INVOKABLE MatrixRoomList *roomList() const;

	Q_INVOKABLE QString mxcUriToHttp(QString mxcUri) const;

	Q_INVOKABLE MatrixDeviceList *devicesOfUser(QString userId) const;

	Kazv::RandomInterface &randomGenerator() const;

	private:
	// Replaces the store with another one
	void emplace(std::optional<Kazv::SdkModel> model, std::unique_ptr<KazvSessionLockGuard> lockGuard);

	Q_SIGNALS:
	void trigger(Kazv::KazvEvent e);

	void loginSuccessful(Kazv::KazvEvent e);
	void loginFailed(QString errorCode, QString errorMsg);
	void discoverFailed(QString errorCode, QString errorMsg);
	void logoutSuccessful();
	void logoutFailed(QString errorCode, QString errorMsg);

	void receivedMessage(QString roomId, QString eventId);

	void sessionChanged();

	public Q_SLOTS:
	void login(const QString &userId, const QString &password);
	void logout();

	/**
	* Serialize data to <AppDataDir>/sessions/<userid>/<deviceid>/
	*
	* If not logged in, do nothing.
	*/
	void serializeToFile() const;

	/**
	* Load session at <AppDataDir>/sessions/<sessionName> .
	*
	* @param sessionName A string in the form of <userid>/<deviceid> .
	*
	* @return true if successful, false otherwise.
	*/
	LoadSessionResult loadSession(QString sessionName);

	/**
	* Delete session at <AppDataDir>/sessions/<sessionName> .
	*
	* @param sessionName A string in the form of <userid>/<deviceid> .
	*
	* @return true if successful, false otherwise.
	*/
	bool deleteSession(QString sessionName);

	/**
	* Start an empty session.
	*
	* The new session is not logged in, and need to call login().
	*
	* @return true if successful, false otherwise.
	*/
	bool startNewSession();

	/**
	* Get all saved sessions.
	*
	* @return A list of session names in the form of <userid>/<deviceid> .
	*/
	QStringList allSessions() const;

	/**
	* Create a new room.
	*
	* @param isPrivate Whether the room is private.
	* @param name The room's name.
	* @param alias The alias of the room.
	* @param invite List of matrix ids of users to invite.
	* @param isDirect Whether it is a direct message room.
	* @param allowFederate Whether to allow users on other servers to join.
	* @param topic The topic of the room.
	* @param powerLevelContentOverride The content to override m.room.power_levels event.
	* @param preset The preset to create the room with.
	* @param encrypted Whether to enable encryption for this room.
	*/
	MatrixPromise *createRoom(
	bool isPrivate,
	const QString &name,
	const QString &alias,
	const QStringList &invite,
	bool isDirect,
	bool allowFederate,
	const QString &topic,
	const QJsonValue &powerLevelContentOverride,
	CreateRoomPreset preset,
	bool encrypted
	);

	/**
	* Join a room.
	* @param idOrAlias The id or alias of the room to join.
	* @param servers The servers to use when joining the room.
	*/
	MatrixPromise *joinRoom(
	const QString &idOrAlias,
	const QStringList &servers
	);

	/**
	* Change the trust level of a device.
	*
	* @param userId The user id that owns the device.
	* @param deviceId The device id to set the trust level.
	* @param trustLevel The trust level.
	*
	* @return A MatrixPromise representing the progress.
	*/
	MatrixPromise *setDeviceTrustLevel(QString userId, QString deviceId, QString trustLevel);

	/**
	* Get the profile of the current user.
	*
	* @return A MatrixPromise representing the progress.
	*/
	MatrixPromise *getSelfProfile();

	/**
	* Set the display name of the current user.
	*
	* @return A MatrixPromise representing the progress.
	*/
	MatrixPromise *setDisplayName(QString displayName);

	/**
	* Set the avatar url of the current user.
	*
	* @return A MatrixPromise representing the progress.
	*/
	MatrixPromise *setAvatarUrl(QString avatarUrl);

	/**
	* Check if an event should be notified.
	*
	* @param event The event to check.
	* @return Whether `event` should be notified.
	*/
	bool shouldNotify(MatrixEvent *event) const;

	/**
	* Check if an event should be notified with sound.
	*
	* You should only call this method when `shouldNotify(event)`
	* returns true.
	*
	* @param event The event to check.
	* @return Whether `event` should be notified with sound.
	*/
	bool shouldPlaySound(MatrixEvent *event) const;

	/**
	* Get the sticker pack list for the current account.
	*
	* @return A list of sticker packs associated with the current account.
	*/
	MatrixStickerPackList *stickerPackList() const;

	/**
	* Get the sticker rooms account data event for the current account.
	*
	* @return A MatrixEvent representing the sticker rooms account data event.
	*/
	MatrixEvent *stickerRoomsEvent() const;

	/**
	* Update the sticker pack from source.
	*
	* @param source The source of the sticker pack to update.
	* @return A promise that resolves when the sticker pack is updated,
	* or when there is an error.
	*/
	MatrixPromise *updateStickerPack(MatrixStickerPackSource source);

	MatrixUserGivenAttrsMap *userGivenNicknameMap() const;

	MatrixPromise *sendAccountData(const QString &type, const QJsonObject &content);

	private:
	MatrixPromise *sendAccountDataImpl(Kazv::Event event);

	private: // Testing
	friend MatrixSdkTest;
	friend MatrixSdkSessionsTest;
	friend MatrixSdk *makeTestSdk(Kazv::SdkModel model);

	void setUserDataDir(const std::string &userDataDir);

	explicit MatrixSdk(Kazv::SdkModel model, bool testing = false, QObject *parent = 0);
	void startThread();
	};
	diff --git a/src/tests/matrix-sdk-sessions-test.cpp b/src/tests/matrix-sdk-sessions-test.cpp
	index 422419d..4c19e3d 100644
	--- a/src/tests/matrix-sdk-sessions-test.cpp
	+++ b/src/tests/matrix-sdk-sessions-test.cpp
	@@ -1,141 +1,195 @@
	/*
	* This file is part of kazv.
	* SPDX-FileCopyrightText: 2024 tusooa <tusooa@kazv.moe>
	* SPDX-License-Identifier: AGPL-3.0-or-later
	*/

	#include <kazv-defs.hpp>
	#include <kazv-platform.hpp>
	#include <memory>
	#include <filesystem>
	#include <fstream>
	#include <QObject>
	#include <QtTest>
	#include <QProcess>
	#include <QCoreApplication>
	#include <crypto/base64.hpp>
	#include "test-temp.hpp"
	#include "matrix-sdk-sessions-test.hpp"

	using namespace Qt::Literals::StringLiterals;
	using namespace Kazv;
	namespace Fs = std::filesystem;
	using StdPath = Fs::path;

	void MatrixSdkSessionsTest::initTestCase()
	{
	auto dir = StdPath(kazvTestTempDir()) / "sessions-test";
	m_userDataDir = dir.string();
	}

	void MatrixSdkSessionsTest::clearDir()
	{
	QVERIFY(!m_userDataDir.empty());
	std::error_code ec;
	Fs::remove_all(StdPath(m_userDataDir), ec);
	QVERIFY(!ec);
	}

	void MatrixSdkSessionsTest::init() { clearDir(); }

	void MatrixSdkSessionsTest::cleanup() { clearDir(); }

	void MatrixSdkSessionsTest::createSession(std::string userId, std::string deviceId)
	{
	auto sessionsDir = StdPath(m_userDataDir) / "sessions";
	SdkModel model;
	model.client.userId = userId;
	model.client.deviceId = deviceId;
	{
	auto sdk = makeMatrixSdk(model, /* testing = */ false);
	sdk->serializeToFile();
	}
	// Not ideal, but this is the only way to wait for
	// MatrixSdkPravite to be destroyed.
	QTest::qWait(100);
	}

	void MatrixSdkSessionsTest::testListSessions()
	{
	createSession("@mew:example.com", "device1");
	createSession("@mew:example.com", "device2");
	createSession("@mew2:example.com", "device3");

	auto sdk = makeMatrixSdk();
	QSet<QString> expected{
	QStringLiteral("@mew:example.com/device1"),
	QStringLiteral("@mew:example.com/device2"),
	QStringLiteral("@mew2:example.com/device3"),
	};

	auto sessionList = sdk->allSessions();
	auto sessionSet = QSet<QString>(sessionList.begin(), sessionList.end());
	QCOMPARE(sessionSet, expected);
	}

	void MatrixSdkSessionsTest::testListLegacySessions()
	{
	// This test cannot be run on Windows, because the file name
	// there cannot contain ':'.
	#if KAZV_IS_WINDOWS
	QSKIP("Skipping because there are no legacy sessions on Windows");
	#endif

	createSession("@mew:example.com", "device1");
	auto legacySession = StdPath(m_userDataDir) / "sessions" / "@mew3:example.com" / "device4";
	{
	std::ofstream s{legacySession / "store"};
	s << "";
	}
	auto sdk = makeMatrixSdk();

	QStringList expected{
	QStringLiteral("@mew:example.com/device1"),
	};

	QCOMPARE(sdk->allSessions(), expected);
	}

	void MatrixSdkSessionsTest::testLoadSession()
	{
	createSession("@mew:example.com", "device4");

	auto sdk = makeMatrixSdk();
	auto res = sdk->loadSession(u"@mew:example.com/device4"_s);
	QCOMPARE(res, MatrixSdk::SessionLoadSuccess);
	QCOMPARE(sdk->userId(), QStringLiteral("@mew:example.com"));
	QCOMPARE(sdk->deviceId(), QStringLiteral("device4"));
	}

	void MatrixSdkSessionsTest::testSessionLock()
	{
	#if KAZV_IS_WINDOWS
	QSKIP("Skipping because session lock is not yet supported on Windows");
	#else
	createSession("@mew:example.com", "device5");

	auto program = QCoreApplication::applicationDirPath() + QStringLiteral("/matrix-sdk-session-loader");
	QProcess proc1;
	QStringList args{
	QString::fromStdString(m_userDataDir),
	QStringLiteral("@mew:example.com/device5"),
	};
	proc1.start(program, args);
	proc1.waitForReadyRead();
	auto line = proc1.readLine();
	QCOMPARE(line, QByteArray("loaded session\n"));

	QProcess proc2;
	proc2.start(program, args);
	auto res = proc2.waitForFinished();
	QVERIFY(res);
	QCOMPARE(proc2.exitStatus(), QProcess::NormalExit);
	QCOMPARE(proc2.exitCode(), 1);

	proc1.kill();
	#endif
	}

	+void MatrixSdkSessionsTest::testSaveSessionFailure()
	+{
	+#if KAZV_IS_WINDOWS
	+ QSKIP("Skipping because session the condition cannot be easily satisfied on Windows");
	+#endif
	+
	+ auto userId = std::string("@mew:example.com");
	+ auto deviceId = std::string("device1");
	+ createSession(userId, deviceId);
	+
	+ auto sessionDir = sessionDirForUserAndDeviceId(Fs::path(m_userDataDir), userId, deviceId);
	+ // there is store, metadata and lock under the sessionDir
	+
	+ std::error_code err;
	+ // make the sessionDir readonly, so that new file cannot be created
	+ Fs::permissions(
	+ sessionDir,
	+ Fs::perms::owner_read \| Fs::perms::owner_exec,
	+ Fs::perm_options::replace,
	+ err);
	+ QVERIFY(!err);
	+ err.clear();
	+
	+ // a model that is slightly different from the original one
	+ SdkModel model;
	+ model.client.userId = userId;
	+ model.client.deviceId = deviceId;
	+ model.client.serverUrl = "https://example.com";
	+
	+ {
	+ auto sdk = makeMatrixSdk(model, /* testing = */ false);
	+ // this should fail
	+ sdk->serializeToFile();
	+ }
	+ // Not ideal, but this is the only way to wait for
	+ // MatrixSdkPravite to be destroyed.
	+ QTest::qWait(100);
	+
	+ auto sdk = makeMatrixSdk();
	+ auto res = sdk->loadSession(QString::fromStdString(userId + "/" + deviceId));
	+ QCOMPARE(res, MatrixSdk::SessionLoadSuccess);
	+ // verify that the original data is kept
	+ QCOMPARE(sdk->serverUrl(), u""_s);
	+
	+ // before cleaning up, add write permissions back so the files can be removed
	+ Fs::permissions(
	+ sessionDir,
	+ Fs::perms::owner_read \| Fs::perms::owner_write \| Fs::perms::owner_exec,
	+ Fs::perm_options::replace,
	+ err);
	+ QVERIFY(!err);
	+ err.clear();
	+}
	+
	#ifndef MATRIX_SDK_SESSIONS_TEST_NO_MAIN
	QTEST_MAIN(MatrixSdkSessionsTest)
	#endif
	diff --git a/src/tests/matrix-sdk-sessions-test.hpp b/src/tests/matrix-sdk-sessions-test.hpp
	index db878c8..c282c6e 100644
	--- a/src/tests/matrix-sdk-sessions-test.hpp
	+++ b/src/tests/matrix-sdk-sessions-test.hpp
	@@ -1,47 +1,48 @@
	/*
	* This file is part of kazv.
	* SPDX-FileCopyrightText: 2024 tusooa <tusooa@kazv.moe>
	* SPDX-License-Identifier: AGPL-3.0-or-later
	*/

	#pragma once
	#include <kazv-defs.hpp>
	#include <memory>
	#include <QObject>
	#include <matrix-sdk.hpp>

	class MatrixSdkSessionsTest : public QObject
	{
	Q_OBJECT

	private:
	std::string m_userDataDir;

	void clearDir();
	void createSession(std::string userId, std::string deviceId);

	public:
	template<class ...Args>
	static std::unique_ptr<MatrixSdk> makeMatrixSdkImpl(std::string userDataDir, Args &&...args)
	{
	std::unique_ptr<MatrixSdk> sdk(new MatrixSdk(std::forward<Args>(args)...));
	sdk->setUserDataDir(userDataDir);
	return sdk;
	}

	template<class ...Args>
	std::unique_ptr<MatrixSdk> makeMatrixSdk(Args &&...args)
	{
	return makeMatrixSdkImpl(m_userDataDir, std::forward<Args>(args)...);
	}

	private Q_SLOTS:
	void initTestCase();
	void init();
	void cleanup();

	void testListSessions();
	void testListLegacySessions();
	void testLoadSession();
	void testSessionLock();
	+ void testSaveSessionFailure();
	};

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