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	diff --git a/src/client/actions/auth.cpp b/src/client/actions/auth.cpp
	index 057c4d4..c98b622 100644
	--- a/src/client/actions/auth.cpp
	+++ b/src/client/actions/auth.cpp
	@@ -1,146 +1,172 @@
	/*
	* Copyright (C) 2020-2022 Tusooa Zhu <tusooa@kazv.moe>
	*
	* This file is part of libkazv.
	*
	* libkazv is free software: you can redistribute it and/or modify
	* it under the terms of the GNU Affero General Public License as
	* published by the Free Software Foundation, either version 3 of the
	* License, or (at your option) any later version.
	*
	* libkazv 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 Affero General Public License for more details.
	*
	* You should have received a copy of the GNU Affero General Public License
	* along with libkazv. If not, see <https://www.gnu.org/licenses/>.
	*/

	#include <libkazv-config.hpp>

	#include <debug.hpp>
	#include <jobinterface.hpp>
	#include <eventinterface.hpp>

	#include "auth.hpp"
	#include "status-utils.hpp"

	namespace Kazv
	{
	ClientResult updateClient(ClientModel m, LoginAction a)
	{
	m.addJob(LoginJob{a.serverUrl,
	"m.login.password"s, // type
	UserIdentifier{ "m.id.user"s, json{{"user", a.username}} }, // identifier
	a.password,
	{}, // token, not used
	{}, // device id, not used
	a.deviceName.value_or("libkazv")}
	.withData(json{
	{"serverUrl", a.serverUrl},
	}));
	return { m, lager::noop };
	}

	ClientResult processResponse(ClientModel m, LoginResponse r)
	{
	if (! r.success()) {
	m.addTrigger(LoginFailed{r.errorCode(), r.errorMessage()});
	return { std::move(m), simpleFail };
	}

	kzo.client.dbg() << "Job success" << std::endl;
	const json &j = r.jsonBody().get();
	// TODO: replace this with r.wellKnown()
	std::string serverUrl = j.contains("well_known")
	? j.at("well_known").at("m.homeserver").at("base_url").get<std::string>()
	: r.dataStr("serverUrl");

	// Synapse will return the server url with trailing slash
	// and not recognize double slashes in the middle
	while (serverUrl.back() == '/') {
	serverUrl.pop_back();
	}

	m.serverUrl = serverUrl;
	m.userId = r.userId().value_or(DEFVAL);
	m.token = r.accessToken().value_or(DEFVAL);
	m.deviceId = r.deviceId().value_or(DEFVAL);
	m.loggedIn = true;

	m.addTrigger(LoginSuccessful{});

	return { std::move(m), lager::noop };
	}

	ClientResult updateClient(ClientModel m, TokenLoginAction a)
	{
	m.serverUrl = a.serverUrl;
	m.userId = a.username;
	m.token = a.token;
	m.deviceId = a.deviceId;
	m.loggedIn = true;

	m.addTrigger(LoginSuccessful{});
	return { std::move(m), lager::noop };
	}


	ClientResult updateClient(ClientModel m, LogoutAction)
	{
	// Note: this only performs a soft-logout.
	m.serverUrl = "";
	m.userId = "";
	m.token = "";
	m.deviceId = "";
	m.loggedIn = false;

	return { std::move(m), lager::noop };
	}

	ClientResult updateClient(ClientModel m, GetWellknownAction a)
	{
	auto pos = a.userId.find(':');
	if (pos == std::string::npos) {
	return { std::move(m), simpleFail };
	}

	auto serverUrl = "https://" + a.userId.substr(pos);

	m.addJob(GetWellknownJob{serverUrl}
	.withData(json{{"serverUrl", serverUrl}}));
	return { m, lager::noop };
	}

	ClientResult processResponse(ClientModel m, GetWellknownResponse r)
	{
	auto success = r.success() \|\| r.statusCode == 404;
	auto error = std::string();

	std::string serverUrl = r.dataStr("serverUrl");

	if (r.success()) {
	auto data = r.data();
	if (data.homeserver.baseUrl.empty()) {
	success = false;
	error = "FAIL_PROMPT";
	} else {
	serverUrl = data.homeserver.baseUrl;
	}
	} else {
	error = "FAIL_PROMPT";
	}

	return {
	std::move(m),
	[success, serverUrl, error](auto &&) {
	auto data = json{
	{"homeserverUrl", serverUrl},
	{"error", error},
	};
	return EffectStatus(success, data);
	}
	};
	}
	+
	+ ClientResult updateClient(ClientModel m, GetVersionsAction a)
	+ {
	+ m.addJob(GetVersionsJob{a.serverUrl});
	+ return { std::move(m), lager::noop };
	+ }
	+
	+ ClientResult processResponse(ClientModel m, GetVersionsResponse r)
	+ {
	+ return {
	+ std::move(m),
	+ [r](auto &&) {
	+ if (r.success()) {
	+ return EffectStatus(r.success(), json{
	+ {"versions", r.versions()},
	+ });
	+ } else {
	+ return EffectStatus(r.success(), json{
	+ {"errorCode", r.errorCode()},
	+ {"error", r.errorMessage()},
	+ });
	+ }
	+ }
	+ };
	+ }
	+
	}
	diff --git a/src/client/actions/auth.hpp b/src/client/actions/auth.hpp
	index e39f045..55c6f85 100644
	--- a/src/client/actions/auth.hpp
	+++ b/src/client/actions/auth.hpp
	@@ -1,37 +1,41 @@
	/*
	* Copyright (C) 2020-2022 Tusooa Zhu <tusooa@kazv.moe>
	*
	* This file is part of libkazv.
	*
	* libkazv is free software: you can redistribute it and/or modify
	* it under the terms of the GNU Affero General Public License as
	* published by the Free Software Foundation, either version 3 of the
	* License, or (at your option) any later version.
	*
	* libkazv 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 Affero General Public License for more details.
	*
	* You should have received a copy of the GNU Affero General Public License
	* along with libkazv. If not, see <https://www.gnu.org/licenses/>.
	*/

	#pragma once
	#include <libkazv-config.hpp>

	#include <csapi/login.hpp>
	#include <csapi/wellknown.hpp>
	+#include <csapi/versions.hpp>

	#include "client-model.hpp"

	namespace Kazv
	{
	ClientResult updateClient(ClientModel m, LoginAction a);
	ClientResult updateClient(ClientModel m, TokenLoginAction a);
	ClientResult processResponse(ClientModel m, LoginResponse r);
	ClientResult updateClient(ClientModel m, LogoutAction a);

	ClientResult updateClient(ClientModel m, GetWellknownAction a);
	ClientResult processResponse(ClientModel m, GetWellknownResponse r);
	+
	+ ClientResult updateClient(ClientModel m, GetVersionsAction a);
	+ ClientResult processResponse(ClientModel m, GetVersionsResponse r);
	}
	diff --git a/src/client/client-model.cpp b/src/client/client-model.cpp
	index 9ef2e66..18f26fe 100644
	--- a/src/client/client-model.cpp
	+++ b/src/client/client-model.cpp
	@@ -1,309 +1,310 @@
	/*
	* Copyright (C) 2020 Tusooa Zhu <tusooa@vista.aero>
	*
	* This file is part of libkazv.
	*
	* libkazv is free software: you can redistribute it and/or modify
	* it under the terms of the GNU Affero General Public License as
	* published by the Free Software Foundation, either version 3 of the
	* License, or (at your option) any later version.
	*
	* libkazv 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 Affero General Public License for more details.
	*
	* You should have received a copy of the GNU Affero General Public License
	* along with libkazv. If not, see <https://www.gnu.org/licenses/>.
	*/

	#include <libkazv-config.hpp>

	#include <immer/algorithm.hpp>
	#include <lager/util.hpp>
	#include <lager/context.hpp>
	#include <functional>

	#include <zug/transducer/filter.hpp>

	#include <immer/flex_vector_transient.hpp>

	#include "debug.hpp"

	#include "client-model.hpp"

	#include "actions/states.hpp"
	#include "actions/auth.hpp"
	#include "actions/membership.hpp"
	#include "actions/paginate.hpp"
	#include "actions/send.hpp"
	#include "actions/states.hpp"
	#include "actions/sync.hpp"
	#include "actions/ephemeral.hpp"
	#include "actions/content.hpp"
	#include "actions/encryption.hpp"

	namespace Kazv
	{
	auto ClientModel::update(ClientModel m, Action a) -> Result
	{
	auto oldDeviceLists = m.deviceLists;

	auto [newClient, effect] = lager::match(std::move(a))(
	[&](RoomListAction a) -> Result {
	m.roomList = RoomListModel::update(std::move(m.roomList), a);
	return {std::move(m), lager::noop};
	},
	[&](ResubmitJobAction a) -> Result {
	m.addJob(std::move(a.job));
	return { std::move(m), lager::noop };
	},
	[&](auto a) -> decltype(updateClient(m, a)) {
	return updateClient(m, a);
	},
	#define RESPONSE_FOR(_jobId) \
	if (r.jobId() == #_jobId) { \
	return processResponse(m, _jobId##Response{std::move(r)}); \
	}

	[&](ProcessResponseAction a) -> Result {
	auto r = std::move(a.response);

	// auth
	RESPONSE_FOR(Login);
	RESPONSE_FOR(GetWellknown);
	+ RESPONSE_FOR(GetVersions);
	// paginate
	RESPONSE_FOR(GetRoomEvents);
	// sync
	RESPONSE_FOR(Sync);
	RESPONSE_FOR(DefineFilter);
	// membership
	RESPONSE_FOR(CreateRoom);
	RESPONSE_FOR(InviteUser);
	RESPONSE_FOR(JoinRoomById);
	RESPONSE_FOR(JoinRoom);
	RESPONSE_FOR(LeaveRoom);
	RESPONSE_FOR(ForgetRoom);
	// send
	RESPONSE_FOR(SendMessage);
	RESPONSE_FOR(SendToDevice);
	// states
	RESPONSE_FOR(GetRoomState);
	RESPONSE_FOR(SetRoomStateWithKey);
	RESPONSE_FOR(GetRoomStateWithKey);
	// ephemeral
	RESPONSE_FOR(SetTyping);
	RESPONSE_FOR(PostReceipt);
	RESPONSE_FOR(SetReadMarker);
	// content
	RESPONSE_FOR(UploadContent);
	RESPONSE_FOR(GetContent);
	RESPONSE_FOR(GetContentThumbnail);
	// encryption
	RESPONSE_FOR(UploadKeys);
	RESPONSE_FOR(QueryKeys);
	RESPONSE_FOR(ClaimKeys);

	m.addTrigger(UnrecognizedResponse{std::move(r)});
	return { std::move(m), lager::noop };
	}

	#undef RESPONSE_FOR
	);

	// Rotate megolm keys for rooms whose users' device list has changed
	auto changedUsers = newClient.deviceLists.diff(oldDeviceLists);
	if (! changedUsers.empty()) {
	auto rooms = newClient.roomList.rooms;
	for (auto [roomId, room] : rooms) {
	auto it = std::find_if(changedUsers.begin(), changedUsers.end(),
	[=](auto userId) { return room.hasUser(userId); });
	if (it != changedUsers.end()) {
	newClient.roomList.rooms =
	std::move(newClient.roomList.rooms)
	.update(roomId, [](auto room) {
	room.shouldRotateSessionKey = true;
	return room;
	});
	}
	}
	}

	return { std::move(newClient), std::move(effect) };
	}

	std::pair<Event, std::optional<std::string>> ClientModel::megOlmEncrypt(
	Event e, std::string roomId, Timestamp timeMs, RandomData random)
	{
	if (!crypto) {
	kzo.client.dbg() << "We do not have e2ee, so do not encrypt events" << std::endl;
	return { e, std::nullopt };
	}

	if (e.encrypted()) {
	kzo.client.dbg() << "The event is already encrypted. Ignoring it." << std::endl;
	return { e, std::nullopt };
	}

	auto &c = crypto.value();

	auto j = e.originalJson().get();
	auto r = roomList[roomId];

	if (! r.encrypted) {
	kzo.client.dbg() << "The room " << roomId
	<< " is not encrypted, so do not encrypt events" << std::endl;
	return { e, std::nullopt };
	}

	auto desc = r.sessionRotateDesc();

	auto keyOpt = std::optional<std::string>{};
	if (r.shouldRotateSessionKey) {
	kzo.client.dbg() << "We should rotate this session." << std::endl;
	keyOpt = c.rotateMegOlmSessionWithRandom(random, timeMs, roomId);
	} else {
	keyOpt = c.rotateMegOlmSessionWithRandomIfNeeded(random, timeMs, roomId, desc);
	}

	// we no longer need to rotate session
	// until next time a device change happens
	roomList.rooms = std::move(roomList.rooms)
	.update(roomId, [](auto r) { r.shouldRotateSessionKey = false; return r; });

	// so that Crypto::encryptMegOlm() can find room id
	j["room_id"] = roomId;

	auto content = c.encryptMegOlm(j);
	j["type"] = "m.room.encrypted";
	j["content"] = std::move(content);
	j["content"]["device_id"] = deviceId;

	kzo.client.dbg() << "Encrypted json is " << j.dump() << std::endl;
	kzo.client.dbg() << "Session key is " << (keyOpt ? keyOpt.value() : "<not rotated>") << std::endl;

	return { Event(JsonWrap(j)), keyOpt };
	}

	Event ClientModel::olmEncrypt(Event e,
	immer::map<std::string, immer::flex_vector<std::string>> userIdToDeviceIdMap, RandomData random)
	{
	if (!crypto) {
	kzo.client.dbg() << "We do not have e2ee, so do not encrypt events" << std::endl;
	return e;
	}

	if (e.encrypted()) {
	kzo.client.dbg() << "The event is already encrypted. Ignoring it." << std::endl;
	return e;
	}

	auto &c = crypto.value();

	auto origJson = e.originalJson().get();

	auto encJson = json::object();
	encJson["content"] = json{
	{"algorithm", CryptoConstants::olmAlgo},
	{"ciphertext", json::object()},
	{"sender_key", c.curve25519IdentityKey()},
	};

	encJson["type"] = "m.room.encrypted";

	for (auto [userId, devices] : userIdToDeviceIdMap) {
	for (auto dev : devices) {
	auto devInfoOpt = deviceLists.get(userId, dev);
	if (! devInfoOpt) {
	continue;
	}
	auto devInfo = devInfoOpt.value();
	auto jsonForThisDevice = origJson;
	jsonForThisDevice["sender"] = this->userId;
	jsonForThisDevice["recipient"] = userId;
	jsonForThisDevice["recipient_keys"] = json{
	{CryptoConstants::ed25519, devInfo.ed25519Key}
	};
	jsonForThisDevice["keys"] = json{
	{CryptoConstants::ed25519, c.ed25519IdentityKey()}
	};
	encJson["content"]["ciphertext"]
	.merge_patch(c.encryptOlmWithRandom(random, jsonForThisDevice, devInfo.curve25519Key));
	random.erase(0, Crypto::encryptOlmMaxRandomSize());
	}
	}

	return Event(JsonWrap(encJson));
	}

	immer::flex_vector<std::string /* deviceId */> ClientModel::devicesToSendKeys(std::string userId) const
	{
	auto trustLevelNeeded = DeviceTrustLevel::Unseen;

	// XXX: preliminary approach
	auto shouldSendP = [=](auto deviceInfo, auto /* deviceMap */) {
	return deviceInfo.trustLevel >= trustLevelNeeded;
	};


	auto devices = deviceLists.devicesFor(userId);

	return intoImmer(
	immer::flex_vector<std::string>{},
	zug::filter([=](auto n) {
	auto [id, dev] = n;
	return shouldSendP(dev, devices);
	})
	\| zug::map([=](auto n) {
	return n.first;
	}),
	devices);
	}

	std::size_t ClientModel::numOneTimeKeysNeeded() const
	{
	auto &crypto = this->crypto.value();

	// Keep half of max supported number of keys
	int numUploadedKeys = crypto.uploadedOneTimeKeysCount(CryptoConstants::signedCurve25519);
	int numKeysNeeded = crypto.maxNumberOfOneTimeKeys() / 2
	- numUploadedKeys;

	// Subtract the number of existing one-time keys, in case
	// the previous upload was not successful.
	int numKeysToGenerate = numKeysNeeded - crypto.numUnpublishedOneTimeKeys();

	return numKeysToGenerate;
	}

	std::size_t EncryptMegOlmEventAction::maxRandomSize()
	{
	return Crypto::rotateMegOlmSessionRandomSize();
	}

	std::size_t EncryptMegOlmEventAction::minRandomSize()
	{
	return 0;
	}

	std::size_t EncryptOlmEventAction::randomSize(EncryptOlmEventAction::UserIdToDeviceIdMap devices)
	{
	auto singleRandomSize = Crypto::encryptOlmMaxRandomSize();
	auto deviceNum = accumulate(devices, std::size_t{},
	[](auto counter, auto pair) { return counter + pair.second.size(); });
	return deviceNum * singleRandomSize;
	}

	std::size_t GenerateAndUploadOneTimeKeysAction::randomSize(std::size_t numToGen)
	{
	return Crypto::genOneTimeKeysRandomSize(numToGen);
	}

	std::size_t ClaimKeysAction::randomSize(immer::map<std::string, immer::flex_vector<std::string>> devicesToSend)
	{
	auto singleRandomSize = Crypto::createOutboundSessionRandomSize();
	auto deviceNum = accumulate(devicesToSend, std::size_t{},
	[](auto counter, auto pair) { return counter + pair.second.size(); });
	return deviceNum * singleRandomSize;
	}
	}
	diff --git a/src/client/client-model.hpp b/src/client/client-model.hpp
	index 01537c9..d0e4eeb 100644
	--- a/src/client/client-model.hpp
	+++ b/src/client/client-model.hpp
	@@ -1,471 +1,476 @@
	/*
	* Copyright (C) 2020-2021 Tusooa Zhu <tusooa@kazv.moe>
	*
	* This file is part of libkazv.
	*
	* libkazv is free software: you can redistribute it and/or modify
	* it under the terms of the GNU Affero General Public License as
	* published by the Free Software Foundation, either version 3 of the
	* License, or (at your option) any later version.
	*
	* libkazv 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 Affero General Public License for more details.
	*
	* You should have received a copy of the GNU Affero General Public License
	* along with libkazv. If not, see <https://www.gnu.org/licenses/>.
	*/


	#pragma once
	#include <libkazv-config.hpp>

	#include <tuple>
	#include <variant>
	#include <string>
	#include <optional>

	#include <lager/context.hpp>
	#include <boost/hana.hpp>
	#include <serialization/std-optional.hpp>


	#include <csapi/sync.hpp>

	#include <file-desc.hpp>
	#include <crypto.hpp>

	#include <serialization/immer-flex-vector.hpp>
	#include <serialization/immer-box.hpp>
	#include <serialization/immer-map.hpp>
	#include <serialization/immer-array.hpp>

	#include "clientfwd.hpp"
	#include "device-list-tracker.hpp"
	#include "room/room-model.hpp"

	namespace Kazv
	{
	inline const std::string DEFTXNID{"0"};

	enum RoomVisibility
	{
	Private,
	Public,
	};

	enum CreateRoomPreset
	{
	PrivateChat,
	PublicChat,
	TrustedPrivateChat,
	};

	enum ThumbnailResizingMethod
	{
	Crop,
	Scale,
	};

	struct ClientModel
	{
	std::string serverUrl;
	std::string userId;
	std::string token;
	std::string deviceId;
	bool loggedIn{false};

	bool syncing{false};
	bool shouldSync{true};
	int firstRetryMs{1000};
	int retryTimeFactor{2};
	int maxRetryMs{30 * 1000};
	int syncTimeoutMs{20000};
	std::string initialSyncFilterId;
	std::string incrementalSyncFilterId;
	std::optional<std::string> syncToken;

	RoomListModel roomList;
	immer::map<std::string /* sender */, Event> presence;
	immer::map<std::string /* type */, Event> accountData;

	std::string nextTxnId{DEFTXNID};
	immer::flex_vector<BaseJob> nextJobs;
	immer::flex_vector<KazvEvent> nextTriggers;

	EventList toDevice;
	std::optional<Crypto> crypto;
	bool identityKeysUploaded{false};

	DeviceListTracker deviceLists;

	immer::flex_vector<std::string /* deviceId */> devicesToSendKeys(std::string userId) const;

	std::pair<Event, std::optional<std::string> /* sessionKey */>
	megOlmEncrypt(Event e, std::string roomId, Timestamp timeMs, RandomData random);
	/// precondition: the one-time keys for those devices must already be claimed
	Event olmEncrypt(Event e, immer::map<std::string, immer::flex_vector<std::string>> userIdToDeviceIdMap, RandomData random);

	/// @return number of one-time keys we need to generate
	std::size_t numOneTimeKeysNeeded() const;

	// helpers
	template<class Job>
	struct MakeJobT
	{
	template<class ...Args>
	constexpr auto make(Args &&...args) const {
	if constexpr (Job::needsAuth()) {
	return Job(
	serverUrl,
	token,
	std::forward<Args>(args)...);
	} else {
	return Job(
	serverUrl,
	std::forward<Args>(args)...);
	}
	}

	std::string serverUrl;
	std::string token;
	};

	template<class Job>
	constexpr auto job() const {
	return MakeJobT<Job>{serverUrl, token};
	}

	inline void addJob(BaseJob j) {
	nextJobs = std::move(nextJobs).push_back(std::move(j));
	}

	inline auto popAllJobs() {
	auto jobs = std::move(nextJobs);
	nextJobs = DEFVAL;
	return jobs;
	};

	inline void addTrigger(KazvEvent t) {
	addTriggers({t});
	}

	inline void addTriggers(immer::flex_vector<KazvEvent> c) {
	nextTriggers = std::move(nextTriggers) + c;
	}

	inline auto popAllTriggers() {
	auto triggers = std::move(nextTriggers);
	nextTriggers = DEFVAL;
	return triggers;
	}

	using Action = ClientAction;
	using Effect = ClientEffect;
	using Result = ClientResult;

	static Result update(ClientModel m, Action a);
	};

	// actions:
	struct LoginAction {
	std::string serverUrl;
	std::string username;
	std::string password;
	std::optional<std::string> deviceName;
	};

	struct TokenLoginAction
	{
	std::string serverUrl;
	std::string username;
	std::string token;
	std::string deviceId;
	};

	struct LogoutAction {};

	struct GetWellknownAction
	{
	std::string userId;
	};

	+ struct GetVersionsAction
	+ {
	+ std::string serverUrl;
	+ };
	+
	struct SyncAction {};

	struct SetShouldSyncAction
	{
	bool shouldSync;
	};

	struct PaginateTimelineAction
	{
	std::string roomId;
	/// Must be where the Gap is
	std::string fromEventId;
	std::optional<int> limit;
	};

	struct SendMessageAction
	{
	std::string roomId;
	Event event;
	};

	struct SendStateEventAction
	{
	std::string roomId;
	Event event;
	};

	struct CreateRoomAction
	{
	using Visibility = RoomVisibility;
	using Preset = CreateRoomPreset;
	Visibility visibility;
	std::optional<std::string> roomAliasName;
	std::optional<std::string> name;
	std::optional<std::string> topic;
	immer::array<std::string> invite;
	//immer::array<Invite3pid> invite3pid;
	std::optional<std::string> roomVersion;
	JsonWrap creationContent;
	immer::array<Event> initialState;
	std::optional<Preset> preset;
	std::optional<bool> isDirect;
	JsonWrap powerLevelContentOverride;
	};

	struct GetRoomStatesAction
	{
	std::string roomId;
	};

	struct GetStateEventAction
	{
	std::string roomId;
	std::string type;
	std::string stateKey;
	};

	struct InviteToRoomAction
	{
	std::string roomId;
	std::string userId;
	};

	struct JoinRoomByIdAction
	{
	std::string roomId;
	};

	struct JoinRoomAction
	{
	std::string roomIdOrAlias;
	immer::array<std::string> serverName;
	};

	struct LeaveRoomAction
	{
	std::string roomId;
	};

	struct ForgetRoomAction
	{
	std::string roomId;
	};


	struct SetTypingAction
	{
	std::string roomId;
	bool typing;
	std::optional<int> timeoutMs;
	};

	struct PostReceiptAction
	{
	std::string roomId;
	std::string eventId;
	};

	struct SetReadMarkerAction
	{
	std::string roomId;
	std::string eventId;
	};

	struct UploadContentAction
	{
	FileDesc content;
	std::optional<std::string> filename;
	std::optional<std::string> contentType;
	std::string uploadId; // to be used by library users
	};

	struct DownloadContentAction
	{
	std::string mxcUri;
	std::optional<FileDesc> downloadTo;
	};

	struct DownloadThumbnailAction
	{
	std::string mxcUri;
	int width;
	int height;
	std::optional<ThumbnailResizingMethod> method;
	std::optional<bool> allowRemote;
	std::optional<FileDesc> downloadTo;
	};

	struct ResubmitJobAction
	{
	BaseJob job;
	};

	struct ProcessResponseAction
	{
	Response response;
	};

	struct PostInitialFiltersAction
	{
	};

	struct SendToDeviceMessageAction
	{
	Event event;
	immer::map<std::string, immer::flex_vector<std::string>> devicesToSend;
	};

	struct UploadIdentityKeysAction
	{
	};

	/**
	* The action to generate one-time keys.
	*
	* `random.size()` must be at least `randomSize(numToGen)`.
	*
	* This action will not generate keys exceeding the local limit of olm.
	*/
	struct GenerateAndUploadOneTimeKeysAction
	{
	/// @return The size of random needed to generate
	/// `numToGen` one-time keys
	static std::size_t randomSize(std::size_t numToGen);
	/// The number of keys to generate
	std::size_t numToGen;
	/// The random data used to generate keys
	RandomData random;
	};

	struct QueryKeysAction
	{
	bool isInitialSync;
	};

	struct ClaimKeysAction
	{
	static std::size_t randomSize(immer::map<std::string, immer::flex_vector<std::string>> devicesToSend);
	std::string roomId;
	std::string sessionId;
	std::string sessionKey;
	immer::map<std::string, immer::flex_vector<std::string>> devicesToSend;
	RandomData random;
	};

	/**
	* The action to encrypt an megolm event for a room.
	*
	* If the action is successful, the result `r` will
	* be such that `r.dataJson("encrypted")` contains the encrypted event json.
	*
	* If the megolm session is rotated, `r.dataStr("key")` will contain the key
	* of the megolm session. Otherwise, `r.data().contains("key")` will be false.
	*
	* The Action may fail due to insufficient random data,
	* when the megolm session needs to be rotated.
	* In this case, the reducer for the Action will fail,
	* and its result `r` will be such that
	* `r.dataStr("reason") == "NotEnoughRandom"`.
	* The user needs to provide random data of
	* at least size `maxRandomSize()`.
	*
	*/
	struct EncryptMegOlmEventAction
	{
	static std::size_t maxRandomSize();
	static std::size_t minRandomSize();

	/// The id of the room to encrypt for.
	std::string roomId;
	/// The event to encrypt.
	Event e;
	/// The timestamp, to determine whether the session should expire.
	Timestamp timeMs;
	/// Random data for the operation. Must be of at least size
	/// `minRandomSize()`. If this is a retry of the previous operation
	/// due to NotEnoughRandom, it must be of at least size `maxRandomSize()`.
	RandomData random;
	};

	/**
	* The action to encrypt events with olm for multiple devices.
	*
	* If the action is successful,
	* The result `r` will be such that `r.dataJson("encrypted")`
	* contains the json of the encrypted event.
	*/
	struct EncryptOlmEventAction
	{
	using UserIdToDeviceIdMap = immer::map<std::string, immer::flex_vector<std::string>>;
	static std::size_t randomSize(UserIdToDeviceIdMap devices);

	/// Devices to encrypt for.
	UserIdToDeviceIdMap devices;
	/// The event to encrypt.
	Event e;
	/// The random data for the encryption. Must be of at least
	/// size `randomSize(devices)`.
	RandomData random;
	};


	template<class Archive>
	void serialize(Archive &ar, ClientModel &m, std::uint32_t const /version/)
	{
	bool dummySyncing{false};
	ar
	& m.serverUrl
	& m.userId
	& m.token
	& m.deviceId
	& m.loggedIn

	& dummySyncing
	& m.firstRetryMs
	& m.retryTimeFactor
	& m.maxRetryMs
	& m.syncTimeoutMs
	& m.initialSyncFilterId
	& m.incrementalSyncFilterId
	& m.syncToken

	& m.roomList
	& m.presence
	& m.accountData

	& m.nextTxnId

	& m.toDevice
	& m.crypto
	& m.identityKeysUploaded

	& m.deviceLists
	;
	}
	}

	BOOST_CLASS_VERSION(Kazv::ClientModel, 0)
	diff --git a/src/client/client.cpp b/src/client/client.cpp
	index 3ea2a60..4bfa7c5 100644
	--- a/src/client/client.cpp
	+++ b/src/client/client.cpp
	@@ -1,359 +1,372 @@
	/*
	* Copyright (C) 2020-2021 Tusooa Zhu <tusooa@kazv.moe>
	*
	* This file is part of libkazv.
	*
	* libkazv is free software: you can redistribute it and/or modify
	* it under the terms of the GNU Affero General Public License as
	* published by the Free Software Foundation, either version 3 of the
	* License, or (at your option) any later version.
	*
	* libkazv 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 Affero General Public License for more details.
	*
	* You should have received a copy of the GNU Affero General Public License
	* along with libkazv. If not, see <https://www.gnu.org/licenses/>.
	*/

	#include <libkazv-config.hpp>

	#include <filesystem>

	#include <lager/constant.hpp>

	#include "client.hpp"

	namespace Kazv
	{
	Client::Client(lager::reader<SdkModel> sdk,
	ContextT ctx, std::nullopt_t)
	: m_sdk(sdk)
	, m_client(sdk.map(&SdkModel::c))
	, m_ctx(std::move(ctx))
	{
	}

	Client::Client(lager::reader<SdkModel> sdk,
	ContextWithDepsT ctx)
	: m_sdk(sdk)
	, m_client(sdk.map(&SdkModel::c))
	, m_ctx(ctx)
	, m_deps(std::move(ctx))
	{
	}

	Client::Client(InEventLoopTag,
	ContextWithDepsT ctx)
	: m_sdk(std::nullopt)
	, m_client(std::nullopt)
	, m_ctx(ctx)
	, m_deps(std::move(ctx))
	#ifdef KAZV_USE_THREAD_SAFETY_HELPER
	, KAZV_ON_EVENT_LOOP_VAR(true)
	#endif
	{
	}

	Client::Client(InEventLoopTag,
	ContextT ctx, DepsT deps)
	: m_sdk(std::nullopt)
	, m_client(std::nullopt)
	, m_ctx(std::move(ctx))
	, m_deps(std::move(deps))
	#ifdef KAZV_USE_THREAD_SAFETY_HELPER
	, KAZV_ON_EVENT_LOOP_VAR(true)
	#endif
	{
	}


	Client Client::toEventLoop() const
	{
	return Client(InEventLoopTag{}, m_ctx, m_deps.value());
	}


	Room Client::room(std::string id) const
	{
	if (m_deps.has_value()) {
	return Room(sdkCursor(), lager::make_constant(id), m_ctx, m_deps.value());
	} else {
	return Room(sdkCursor(), lager::make_constant(id), m_ctx);
	}
	}

	Room Client::roomByCursor(lager::reader<std::string> id) const
	{
	if (m_deps.has_value()) {
	return Room(sdkCursor(), id, m_ctx, m_deps.value());
	} else {
	return Room(sdkCursor(), id, m_ctx);
	}
	}

	auto Client::passwordLogin(std::string homeserver, std::string username,
	std::string password, std::string deviceName) const
	-> PromiseT
	{
	auto p1 = m_ctx.dispatch(LoginAction{
	homeserver, username, password, deviceName});
	p1
	.then([that=toEventLoop()](auto stat) {
	if (! stat.success()) {
	return;
	}
	// It is meaningless to wait for it in a Promise
	// that is never exposed to the user.
	that.startSyncing();
	});

	return p1;
	}

	auto Client::tokenLogin(std::string homeserver, std::string username,
	std::string token, std::string deviceId) const
	-> PromiseT
	{
	auto p1 = m_ctx.dispatch(TokenLoginAction{
	homeserver, username, token, deviceId});
	p1
	.then([that=toEventLoop()](auto stat) {
	if (! stat.success()) {
	return;
	}
	that.startSyncing();
	});

	return p1;
	}

	auto Client::autoDiscover(std::string userId) const
	-> PromiseT
	{
	- return m_ctx.dispatch(GetWellknownAction{userId});
	+ return m_ctx.dispatch(GetWellknownAction{userId})
	+ .then([that=toEventLoop()](auto stat) {
	+ if (!stat.success()) {
	+ return that.m_ctx.createResolvedPromise(stat);
	+ }
	+ return that.m_ctx.dispatch(GetVersionsAction{stat.dataStr("serverUrl")})
	+ .then([that, stat](auto stat2) {
	+ if (!stat2.success()) {
	+ return stat2;
	+ } else {
	+ return stat;
	+ }
	+ });
	+ });
	}

	auto Client::createRoom(RoomVisibility v,
	std::optional<std::string> name,
	std::optional<std::string> alias,
	immer::array<std::string> invite,
	std::optional<bool> isDirect,
	bool allowFederate,
	std::optional<std::string> topic,
	JsonWrap powerLevelContentOverride) const
	-> PromiseT
	{
	CreateRoomAction a;
	a.visibility = v;
	a.name = name;
	a.roomAliasName = alias;
	a.invite = invite;
	a.isDirect = isDirect;
	a.topic = topic;
	a.powerLevelContentOverride = powerLevelContentOverride;
	// Synapse won't buy it if we do not provide
	// a creationContent object.
	a.creationContent = json{
	{"m.federate", allowFederate}
	};
	return m_ctx.dispatch(std::move(a));
	}

	auto Client::joinRoomById(std::string roomId) const -> PromiseT
	{
	return m_ctx.dispatch(JoinRoomByIdAction{roomId});
	}

	auto Client::joinRoom(std::string roomId, immer::array<std::string> serverName) const
	-> PromiseT
	{
	return m_ctx.dispatch(JoinRoomAction{roomId, serverName});
	}

	auto Client::uploadContent(immer::box<Bytes> content,
	std::string uploadId,
	std::optional<std::string> filename,
	std::optional<std::string> contentType) const
	-> PromiseT
	{
	return m_ctx.dispatch(UploadContentAction{
	FileDesc(FileContent{content.get().begin(), content.get().end()}),
	filename, contentType, uploadId});
	}

	auto Client::uploadContent(FileDesc file) const
	-> PromiseT
	{
	auto basename = file.name()
	? std::optional(std::filesystem::path(file.name().value()).filename().native())
	: std::nullopt;
	return m_ctx.dispatch(UploadContentAction{
	file,
	// use only basename to prevent path info being leaked
	basename,
	file.contentType(),
	// uploadId unused
	std::string{}});
	}

	auto Client::downloadContent(std::string mxcUri, std::optional<FileDesc> downloadTo) const
	-> PromiseT
	{
	return m_ctx.dispatch(DownloadContentAction{mxcUri, downloadTo});
	}

	auto Client::downloadThumbnail(
	std::string mxcUri,
	int width,
	int height,
	std::optional<ThumbnailResizingMethod> method,
	std::optional<FileDesc> downloadTo) const
	-> PromiseT
	{
	return m_ctx.dispatch(DownloadThumbnailAction{mxcUri, width, height, method, std::nullopt, downloadTo});
	}

	auto Client::startSyncing() const -> PromiseT
	{
	KAZV_VERIFY_THREAD_ID();
	using namespace Kazv::CursorOp;

	if (+syncing()) {
	return m_ctx.createResolvedPromise(true);
	}

	auto p1 = m_ctx.createResolvedPromise(true)
	.then([that=toEventLoop()](auto) {
	// post filters, if filters are incomplete
	if ((+that.clientCursor()[&ClientModel::initialSyncFilterId]).empty()
	\|\| (+that.clientCursor()[&ClientModel::incrementalSyncFilterId]).empty()) {
	return that.m_ctx.dispatch(PostInitialFiltersAction{});
	}
	return that.m_ctx.createResolvedPromise(true);
	})
	.then([that=toEventLoop()](auto stat) {
	if (! stat.success()) {
	return that.m_ctx.createResolvedPromise(stat);
	}
	// Upload identity keys if we need to
	if (+that.clientCursor()[&ClientModel::crypto]
	&& ! +that.clientCursor()[&ClientModel::identityKeysUploaded]) {
	return that.m_ctx.dispatch(UploadIdentityKeysAction{});
	} else {
	return that.m_ctx.createResolvedPromise(true);
	}
	});

	p1
	.then([m_ctx=m_ctx](auto stat) {
	m_ctx.dispatch(SetShouldSyncAction{true});
	return stat;
	})
	.then([that=toEventLoop()](auto stat) {
	if (stat.success()) {
	that.syncForever();
	}
	});

	return p1;
	}

	auto Client::syncForever(std::optional<int> retryTime) const -> void
	{
	KAZV_VERIFY_THREAD_ID();

	// assert (m_deps);
	using namespace CursorOp;

	bool isInitialSync = ! (+clientCursor()[&ClientModel::syncToken]).has_value();

	bool shouldSync = +clientCursor()[&ClientModel::shouldSync];

	if (! shouldSync) {
	return;
	}
	//

	auto syncRes = m_ctx.dispatch(SyncAction{});

	auto uploadOneTimeKeysRes = syncRes
	.then([that=toEventLoop()](auto stat) {
	if (! stat.success()) {
	return that.m_ctx.createResolvedPromise(stat);
	}
	auto &rg = lager::get<RandomInterface &>(that.m_deps.value());
	bool hasCrypto{+that.clientCursor()[&ClientModel::crypto]};
	if (! hasCrypto) {
	return that.m_ctx.createResolvedPromise(true);
	}
	auto numKeysToGenerate = (+that.clientCursor()).numOneTimeKeysNeeded();
	return that.m_ctx.dispatch(GenerateAndUploadOneTimeKeysAction{
	numKeysToGenerate,
	rg.generateRange<RandomData>(GenerateAndUploadOneTimeKeysAction::randomSize(numKeysToGenerate))
	});
	});

	auto queryKeysRes = syncRes
	.then([that=toEventLoop(), isInitialSync](auto stat) {
	if (! stat.success()) {
	return that.m_ctx.createResolvedPromise(stat);
	}
	bool hasCrypto{+that.clientCursor()[&ClientModel::crypto]};
	return hasCrypto
	? that.m_ctx.dispatch(QueryKeysAction{isInitialSync})
	: that.m_ctx.createResolvedPromise(true);
	});

	m_ctx.promiseInterface()
	.all(std::vector<PromiseT>{uploadOneTimeKeysRes, queryKeysRes})
	.then([that=toEventLoop(), retryTime](auto stat) {
	if (stat.success()) {
	that.syncForever(); // reset retry time
	} else {
	auto firstRetryTime = +that.clientCursor()[&ClientModel::firstRetryMs];
	auto retryTimeFactor = +that.clientCursor()[&ClientModel::retryTimeFactor];
	auto maxRetryTime = +that.clientCursor()[&ClientModel::maxRetryMs];
	auto curRetryTime = retryTime ? retryTime.value() : firstRetryTime;
	if (curRetryTime > maxRetryTime) { curRetryTime = maxRetryTime; }
	auto nextRetryTime = curRetryTime * retryTimeFactor;

	kzo.client.warn() << "Sync failed, retrying in " << curRetryTime << "ms" << std::endl;
	auto &jh = getJobHandler(that.m_deps.value());
	jh.setTimeout([that=that.toEventLoop(), nextRetryTime]() { that.syncForever(nextRetryTime); },
	curRetryTime);
	}
	});
	}

	void Client::stopSyncing() const
	{
	m_ctx.dispatch(SetShouldSyncAction{false});
	}

	lager::reader<ClientModel> Client::clientCursor() const
	{
	KAZV_VERIFY_THREAD_ID();

	if (m_client.has_value()) {
	return m_client.value();
	} else {
	assert(m_deps.has_value());
	return lager::get<SdkModelCursorKey>(m_deps.value())->map(&SdkModel::c);
	}
	}

	const lager::reader<SdkModel> &Client::sdkCursor() const
	{
	KAZV_VERIFY_THREAD_ID();

	if (m_sdk.has_value()) {
	return m_sdk.value();
	} else {
	assert(m_deps.has_value());
	return *(lager::get<SdkModelCursorKey>(m_deps.value()));
	}
	}

	}
	diff --git a/src/client/clientfwd.hpp b/src/client/clientfwd.hpp
	index d9a3f08..3b76ede 100644
	--- a/src/client/clientfwd.hpp
	+++ b/src/client/clientfwd.hpp
	@@ -1,129 +1,131 @@
	/*
	* Copyright (C) 2020-2021 Tusooa Zhu <tusooa@kazv.moe>
	*
	* This file is part of libkazv.
	*
	* libkazv is free software: you can redistribute it and/or modify
	* it under the terms of the GNU Affero General Public License as
	* published by the Free Software Foundation, either version 3 of the
	* License, or (at your option) any later version.
	*
	* libkazv 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 Affero General Public License for more details.
	*
	* You should have received a copy of the GNU Affero General Public License
	* along with libkazv. If not, see <https://www.gnu.org/licenses/>.
	*/

	#pragma once
	#include <libkazv-config.hpp>

	#include <tuple>
	#include <variant>

	#include <lager/context.hpp>
	#include <context.hpp>

	#include "room/room-model.hpp"

	namespace Kazv
	{
	using namespace Api;
	class JobInterface;
	class EventInterface;

	struct LoginAction;
	struct TokenLoginAction;
	struct LogoutAction;
	struct GetWellknownAction;
	+ struct GetVersionsAction;
	struct SyncAction;
	struct SetShouldSyncAction;
	struct PostInitialFiltersAction;
	struct PaginateTimelineAction;
	struct SendMessageAction;
	struct SendStateEventAction;
	struct CreateRoomAction;
	struct GetRoomStatesAction;
	struct GetStateEventAction;
	struct InviteToRoomAction;
	struct JoinRoomByIdAction;
	struct EmitKazvEventsAction;
	struct JoinRoomAction;
	struct LeaveRoomAction;
	struct ForgetRoomAction;

	struct ProcessResponseAction;
	struct SetTypingAction;
	struct PostReceiptAction;
	struct SetReadMarkerAction;

	struct UploadContentAction;
	struct DownloadContentAction;
	struct DownloadThumbnailAction;

	struct SendToDeviceMessageAction;

	struct UploadIdentityKeysAction;
	struct GenerateAndUploadOneTimeKeysAction;
	struct QueryKeysAction;
	struct ClaimKeysAction;
	struct EncryptMegOlmEventAction;
	struct EncryptOlmEventAction;

	struct ResubmitJobAction;

	struct ClientModel;

	using ClientAction = std::variant<
	RoomListAction,

	LoginAction,
	TokenLoginAction,
	LogoutAction,
	GetWellknownAction,
	+ GetVersionsAction,

	SyncAction,
	SetShouldSyncAction,
	PostInitialFiltersAction,

	PaginateTimelineAction,
	SendMessageAction,
	SendStateEventAction,
	CreateRoomAction,
	GetRoomStatesAction,
	GetStateEventAction,
	InviteToRoomAction,
	JoinRoomByIdAction,

	JoinRoomAction,
	LeaveRoomAction,
	ForgetRoomAction,

	ProcessResponseAction,

	SetTypingAction,
	PostReceiptAction,
	SetReadMarkerAction,

	UploadContentAction,
	DownloadContentAction,
	DownloadThumbnailAction,

	SendToDeviceMessageAction,

	UploadIdentityKeysAction,
	GenerateAndUploadOneTimeKeysAction,
	QueryKeysAction,
	ClaimKeysAction,
	EncryptMegOlmEventAction,
	EncryptOlmEventAction,

	ResubmitJobAction
	>;

	using ClientEffect = Effect<ClientAction, lager::deps<>>;

	using ClientResult = std::pair<ClientModel, ClientEffect>;
	}
	diff --git a/src/tests/client/discovery-test.cpp b/src/tests/client/discovery-test.cpp
	index 70ed58d..c3a1643 100644
	--- a/src/tests/client/discovery-test.cpp
	+++ b/src/tests/client/discovery-test.cpp
	@@ -1,94 +1,151 @@
	/*
	* This file is part of libkazv.
	* SPDX-FileCopyrightText: 2022 Tusooa Zhu <tusooa@kazv.moe>
	* SPDX-License-Identifier: AGPL-3.0-or-later
	*/

	#include <libkazv-config.hpp>

	#include <catch2/catch.hpp>

	#include <boost/asio.hpp>

	#include <asio-promise-handler.hpp>
	#include <cursorutil.hpp>
	#include <sdk-model.hpp>
	#include <client/client.hpp>

	#include "client-test-util.hpp"

	static const json wellKnownResponseJson = R"({
	"m.homeserver": {
	"base_url": "https://matrix.example.com"
	},
	"m.identity_server": {
	"base_url": "https://identity.example.com"
	},
	"org.example.custom.property": {
	"app_url": "https://custom.app.example.org"
	}
	})"_json;

	+static const json versionsResponseJson = R"({
	+ "unstable_features": {
	+ "org.example.my_feature": true
	+ },
	+ "versions": [
	+ "r0.0.1",
	+ "v1.1"
	+ ]
	+})"_json;
	+
	+
	TEST_CASE("Auto-discovery tests", "[client][discovery]")
	{
	using namespace Kazv::CursorOp;

	boost::asio::io_context io;
	AsioPromiseHandler ph{io.get_executor()};

	auto store = createTestClientStore(ph);

	WHEN("We got a successful response")
	{
	auto resp = createResponse("GetWellknown", wellKnownResponseJson,
	json{{"serverUrl", "https://example.com"}});

	THEN("We should return the server url in the response")
	{
	store.dispatch(ProcessResponseAction{resp})
	.then([](auto stat) {
	REQUIRE(stat.success());
	auto data = stat.dataStr("homeserverUrl");
	REQUIRE(data == std::string("https://matrix.example.com"));
	});
	}
	}

	WHEN("We got 404")
	{
	auto resp = createResponse("GetWellknown", wellKnownResponseJson,
	json{{"serverUrl", "https://example.com"}});

	resp.statusCode = 404;

	THEN("We should return the server in the user id")
	{
	store.dispatch(ProcessResponseAction{resp})
	.then([](auto stat) {
	REQUIRE(stat.success());
	auto data = stat.dataStr("homeserverUrl");
	REQUIRE(data == std::string("https://example.com"));
	});
	}
	}

	WHEN("We got other error codes")
	{
	auto resp = createResponse("GetWellknown", wellKnownResponseJson,
	json{{"serverUrl", "https://example.com"}});

	resp.statusCode = 500;

	THEN("We should FAIL_PROMPT")
	{
	store.dispatch(ProcessResponseAction{resp})
	.then([](auto stat) {
	REQUIRE(!stat.success());
	auto data = stat.dataStr("error");
	REQUIRE(data == std::string("FAIL_PROMPT"));
	});
	}
	}

	io.run();
	}
	+
	+TEST_CASE("GetVersions", "[client][discovery]")
	+{
	+ using namespace Kazv::CursorOp;
	+
	+ boost::asio::io_context io;
	+ AsioPromiseHandler ph{io.get_executor()};
	+
	+ auto store = createTestClientStore(ph);
	+
	+ WHEN("We got a successful response")
	+ {
	+ auto resp = createResponse("GetVersions", versionsResponseJson);
	+
	+ THEN("We should return the versions supported")
	+ {
	+ store.dispatch(ProcessResponseAction{resp})
	+ .then([](auto stat) {
	+ REQUIRE(stat.success());
	+ auto data = stat.dataJson("versions");
	+ REQUIRE(data == immer::flex_vector<std::string>{
	+ "r0.0.1",
	+ "v1.1"
	+ });
	+ });
	+ }
	+ }
	+
	+ WHEN("We got an error")
	+ {
	+ auto resp = createResponse("GetVersions", json());
	+
	+ resp.statusCode = 400;
	+
	+ THEN("We should fail")
	+ {
	+ store.dispatch(ProcessResponseAction{resp})
	+ .then([](auto stat) {
	+ REQUIRE(!stat.success());
	+ REQUIRE(stat.dataJson("errorCode") == "400");
	+ });
	+ }
	+ }
	+
	+ io.run();
	+}

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