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	diff --git a/changelogs/65.add b/changelogs/65.add
	new file mode 100644
	index 0000000..013bef6
	--- /dev/null
	+++ b/changelogs/65.add
	@@ -0,0 +1 @@
	+Implement inviting user
	diff --git a/src/contents/ui/main.qml b/src/contents/ui/main.qml
	index c059b8b..0d5682d 100644
	--- a/src/contents/ui/main.qml
	+++ b/src/contents/ui/main.qml
	@@ -1,274 +1,280 @@
	/*
	* This file is part of kazv.
	* SPDX-FileCopyrightText: 2020-2023 tusooa <tusooa@kazv.moe>
	* SPDX-License-Identifier: AGPL-3.0-or-later
	*/

	import QtQuick 2.1
	import org.kde.kirigami 2.4 as Kirigami
	import QtQuick.Controls 2.0 as Controls
	import moe.kazv.mxc.kazv 0.0 as MK

	import '.' as Kazv
	import 'shortcuts' as KazvShortcuts

	import 'l10n.js' as L10n

	Kirigami.ApplicationWindow {
	id: root

	property var kazvIOManager: MK.KazvIOManager {
	cacheDirectory: kazvConfig.cacheDirectory
	}

	property var matrixSdk: MK.MatrixSdk {
	onLoginSuccessful: {
	switchToMainPage();
	recordLastSession();
	}
	onLoginFailed: {
	console.log("Login Failed");
	showPassiveNotification(l10n.get('login-page-request-failed-prompt', { errorCode, errorMsg }));
	}
	onDiscoverFailed: {
	console.log("Discover Failed");
	showPassiveNotification(l10n.get('login-page-discover-failed-prompt', { errorCode, errorMsg }));
	}
	onSessionChanged: {
	console.log('session changed');
	reloadSdkVariables();
	}
	}

	property var loggedIn: !!matrixSdk.token

	property var sdkVars: QtObject {
	property var roomList: matrixSdk.roomList()
	property string currentRoomId: ''
	}

	property var l10nProvider: MK.L10nProvider {
	}

	property var kazvConfig: MK.KazvConfig {
	}

	function initializeL10n () {
	const availableLocales = l10nProvider.availableLocaleCodes();
	console.log('available locales:', availableLocales);
	const desiredLanguages = [Qt.uiLanguage];
	console.log('ui language is: ', desiredLanguages);
	const defaultLocale = 'en';

	const wantedLocales = L10n.negotiateLanguages(desiredLanguages, availableLocales, defaultLocale);

	console.log('wanted locales:', wantedLocales);

	const bundles = L10n.generateBundles(wantedLocales, l10nProvider.getFtlData(wantedLocales));
	const provider = new L10n.FluentProvider(bundles);

	return provider;
	}

	property var l10n: initializeL10n();

	title: l10n.get('app-title')

	globalDrawer: Kirigami.GlobalDrawer {
	title: l10n.get('global-drawer-title')
	titleIcon: "applications-graphics"
	property var actionGroupName: 'global-drawer-actions'
	actions: [
	Kirigami.Action {
	objectName: 'switch-account'
	text: l10n.get('global-drawer-action-switch-account')
	iconName: 'system-switch-user'
	onTriggered: switchAccount()
	},
	Kirigami.Action {
	objectName: 'hard-logout'
	text: l10n.get('global-drawer-action-hard-logout')
	onTriggered: hardLogout()
	},
	Kirigami.Action {
	objectName: 'save'
	text: l10n.get('global-drawer-action-save-session')
	onTriggered: {
	recordLastSession()
	matrixSdk.serializeToFile()
	}
	},
	Kirigami.Action {
	objectName: 'configure-shortcuts'
	text: l10n.get('global-drawer-action-configure-shortcuts')
	onTriggered: {
	pushActionSettingsPage();
	}
	},
	Kirigami.Action {
	objectName: 'settings'
	text: l10n.get('global-drawer-action-settings')
	onTriggered: {
	pushSettingsPage();
	}
	},
	Kirigami.Action {
	objectName: 'create-room'
	enabled: root.loggedIn
	iconName: 'contact-new'
	text: l10n.get('global-drawer-action-create-room')
	onTriggered: {
	pushCreateRoomPage();
	}
	},
	Kirigami.Action {
	objectName: 'join-room'
	enabled: root.loggedIn
	text: l10n.get('global-drawer-action-join-room')
	onTriggered: {
	pushJoinRoomPage();
	}
	}
	]
	}

	contextDrawer: Kirigami.ContextDrawer {
	id: contextDrawer
	}

	property var actionCollection: KazvShortcuts.ActionCollection {
	id: globalActionCollection
	children: [
	root.globalDrawer,
	root.contextDrawer,
	]
	shortcutsConfig: kazvConfig
	}

	property var notifier: Kazv.Notifier {
	}

	pageStack.initialPage: Qt.resolvedUrl("LoginPage.qml")

	property var mainPage: Kazv.MainPage {
	id: mainPage
	}

	property var emptyPage: Kirigami.Page {
	title: l10n.get('empty-room-page-title')
	Controls.Label {
	text: l10n.get('empty-room-page-description')
	}
	}

	function activateRoomPage() {
	pageStack.push(Qt.resolvedUrl("RoomPage.qml"), {
	roomId: root.sdkVars.currentRoomId,
	});
	}

	function activateRoomSettingsPage(room) {
	pageStack.push(Qt.resolvedUrl("room-settings/RoomSettingsPage.qml"), {
	room
	});
	}

	+ function activateRoomInvitePage(room) {
	+ pageStack.push(Qt.resolvedUrl("room-settings/RoomInvitePage.qml"), {
	+ room
	+ });
	+ }
	+
	function activateUserPage(user, room) {
	pageStack.push(Qt.resolvedUrl("qrc:///UserPage.qml"), {
	userId: user.userId,
	user,
	room
	});
	}

	function switchToMainPage() {
	pageStack.replace([mainPage])
	pageStack.currentIndex = 0
	}

	function switchToLoginPage() {
	pageStack.replace([Qt.resolvedUrl("LoginPage.qml")])
	pageStack.currentIndex = 0
	}

	function pushLoginPage() {
	pageStack.push(Qt.resolvedUrl("LoginPage.qml"), {
	isSwitchingAccount: true,
	});
	}

	function pushActionSettingsPage() {
	pageStack.push(Qt.resolvedUrl("ActionSettingsPage.qml"), {
	actions: globalActionCollection.allActions(),
	});
	}

	function pushSettingsPage() {
	pageStack.push(Qt.resolvedUrl("SettingsPage.qml"));
	}

	function pushCreateRoomPage() {
	pageStack.push(Qt.resolvedUrl("CreateRoomPage.qml"), {});
	}

	function pushJoinRoomPage() {
	pageStack.push(Qt.resolvedUrl("JoinRoomPage.qml"), {});
	}

	function sessionNameFor(userId, deviceId) {
	return userId + '/' + deviceId;
	}

	function loadSession(sessionName) {
	const succ = matrixSdk.loadSession(sessionName);

	if (succ) {
	console.log('load session successful');
	switchToMainPage();
	recordLastSession();
	} else {
	console.log('load session failed');
	}
	return succ;
	}

	function loadLastSession() {
	console.log('last session is:', kazvConfig.lastSession);

	return loadSession(kazvConfig.lastSession);
	}

	function recordLastSession() {
	kazvConfig.lastSession = sessionNameFor(matrixSdk.userId, matrixSdk.deviceId);
	}

	function reloadSdkVariables() {
	sdkVars.roomList = matrixSdk.roomList();
	sdkVars.currentRoomId = '';
	}

	Connections {
	target: sdkVars
	function onCurrentRoomIdChanged() {
	if (sdkVars.currentRoomId.length) {
	activateRoomPage()
	}
	}
	}

	function switchAccount() {
	pushLoginPage();
	}

	function hardLogout() {
	}

	Component.onCompleted: {
	actionCollection.setupShortcuts();
	loadLastSession();
	}

	onClosing: {
	kazvIOManager.clearJobs()
	}
	}
	diff --git a/src/contents/ui/room-settings/RoomInvitePage.qml b/src/contents/ui/room-settings/RoomInvitePage.qml
	new file mode 100644
	index 0000000..826b854
	--- /dev/null
	+++ b/src/contents/ui/room-settings/RoomInvitePage.qml
	@@ -0,0 +1,58 @@
	+/*
	+ * This file is part of kazv.
	+ * SPDX-FileCopyrightText: 2023 tusooa <tusooa@kazv.moe>
	+ * SPDX-License-Identifier: AGPL-3.0-or-later
	+ */
	+
	+import QtQuick 2.15
	+import QtQuick.Layouts 1.15
	+import QtQuick.Controls 2.15
	+
	+import org.kde.kirigami 2.20 as Kirigami
	+
	+import '..' as Kazv
	+import '../matrix-helpers.js' as Helpers
	+
	+Kirigami.ScrollablePage {
	+ id: roomInvitePage
	+
	+ property var room
	+ property var roomDisplayName: Helpers.roomNameOrHeroes(room, l10n)
	+ property var inviting: false
	+
	+ title: l10n.get('room-invite-page-title', { room: roomDisplayName })
	+
	+ property var inviteUser: Kazv.AsyncHandler {
	+ trigger: () => {
	+ roomInvitePage.inviting = true;
	+ return room.inviteUser(inviteUserIdInput.text);
	+ }
	+ onResolved: {
	+ roomInvitePage.inviting = false;
	+ if (!success) {
	+ showPassiveNotification(l10n.get('room-invite-page-invite-failed-prompt', { errorCode: data.errorCode, errorMsg: data.error }));
	+ } else {
	+ pageStack.removePage(roomInvitePage);
	+ }
	+ }
	+ }
	+
	+ Kirigami.FormLayout {
	+ TextField {
	+ id: inviteUserIdInput
	+ objectName: 'inviteUserIdInput'
	+ placeholderText: l10n.get('room-invite-invitee-matrix-id-placeholder')
	+ Kirigami.FormData.label: l10n.get('room-invite-invitee-matrix-id-prompt')
	+ }
	+
	+ Button {
	+ objectName: 'inviteUserButton'
	+ text: l10n.get('room-invite-page-invite-button')
	+ enabled: !roomInvitePage.inviting
	+ Layout.fillWidth: true
	+ onClicked: {
	+ roomInvitePage.inviteUser.call();
	+ }
	+ }
	+ }
	+}
	diff --git a/src/contents/ui/room-settings/RoomSettingsPage.qml b/src/contents/ui/room-settings/RoomSettingsPage.qml
	index 42a02c1..7cef631 100644
	--- a/src/contents/ui/room-settings/RoomSettingsPage.qml
	+++ b/src/contents/ui/room-settings/RoomSettingsPage.qml
	@@ -1,136 +1,145 @@
	/*
	* This file is part of kazv.
	* SPDX-FileCopyrightText: 2023 tusooa <tusooa@kazv.moe>
	* SPDX-License-Identifier: AGPL-3.0-or-later
	*/

	import QtQuick 2.15
	import QtQuick.Layouts 1.15
	import QtQuick.Controls 2.15

	import org.kde.kirigami 2.13 as Kirigami

	import '../matrix-helpers.js' as Helpers

	import '..' as Kazv
	import '.' as RoomSettings

	Kirigami.ScrollablePage {
	id: roomSettingsPage

	property var room
	property var roomDisplayName: Helpers.roomNameOrHeroes(room, l10n)
	property var customTagIds: room.tagIds.filter(k => k.startsWith('u.'))

	title: l10n.get('room-settings-page-title', { room: roomDisplayName })

	function tagIdToName(tagId) {
	return tagId.slice(2);
	}

	property var tagHandler: RoomSettings.RoomTagHandler {
	room: roomSettingsPage.room
	}

	ColumnLayout {
	Button {
	text: l10n.get('room-settings-members-action')
	Layout.fillWidth: true
	onClicked: pageStack.push(Qt.resolvedUrl('qrc:/room-settings/RoomMemberListPage.qml'), { room: room, members: room.members() })
	}

	Button {
	text: l10n.get('room-settings-banned-members-action')
	Layout.fillWidth: true
	onClicked: pageStack.push(Qt.resolvedUrl('qrc:/room-settings/RoomMemberListPage.qml'), { room: room, members: room.bannedMembers() })
	}

	Label {
	text: l10n.get('room-settings-tags')
	Layout.fillWidth: true
	}

	CheckBox {
	text: l10n.get('room-settings-favourited')
	checkable: true
	checked: tagHandler.hasTag('m.favourite')
	enabled: tagHandler.available
	onToggled: tagHandler.toggleTag('m.favourite')
	}

	ListView {
	model: customTagIds.length
	Layout.fillWidth: true
	Layout.fillHeight: true
	Layout.minimumHeight: childrenRect.height
	delegate: Kirigami.SwipeListItem {
	required property var index
	Label {
	text: tagIdToName(customTagIds[index])
	}

	actions: [
	Kirigami.Action {
	enabled: tagHandler.available
	iconName: 'list-remove-symbolic'
	text: l10n.get('room-settings-remove-tag')
	onTriggered: tagHandler.toggleTag(customTagIds[index])
	}
	]
	}
	}

	RowLayout {
	TextField {
	id: newTagName
	enabled: tagHandler.available
	text: ''
	Layout.fillWidth: true
	}
	Button {
	enabled: tagHandler.available
	text: l10n.get('room-settings-add-tag')
	onClicked: {
	tagHandler.toggleTag('u.' + newTagName.text)
	}
	}
	Connections {
	target: tagHandler
	function onTagAdded(tagId) {
	if (tagId === 'u.' + newTagName.text) {
	newTagName.text = '';
	}
	}
	}
	}

	+ Button {
	+ text: l10n.get('room-invite-action')
	+ Layout.fillWidth: true
	+ onClicked: {
	+ activateRoomInvitePage(roomSettingsPage.room);
	+ }
	+ }
	+
	Button {
	text: l10n.get('room-leave-action')
	+ Layout.fillWidth: true
	onClicked: {
	confirmLeaveOverlay.open();
	}
	}
	}

	property var confirmLeaveOverlay: Kazv.ConfirmationOverlay {
	parent: roomSettingsPage.overlay
	title: l10n.get('room-leave-confirm-popup-title')
	message: l10n.get('room-leave-confirm-popup-message')
	confirmActionText: l10n.get('room-leave-confirm-popup-confirm-action')
	cancelActionText: l10n.get('room-leave-confirm-popup-cancel-action')

	onAccepted: leaveRoomHandler.call()
	}

	property var leaveRoomHandler: Kazv.AsyncHandler {
	trigger: () => room.leaveRoom()
	onResolved: {
	if (success) {
	showPassiveNotification(l10n.get('leave-room-success-prompt', { room: roomId }));
	inviteOverlay.close();
	} else {
	showPassiveNotification(l10n.get('leave-room-failed-prompt', { room: roomId, errorCode: data.errorCode, errorMsg: data.error }));
	}
	}
	}
	}
	diff --git a/src/l10n/cmn-Hans/100-ui.ftl b/src/l10n/cmn-Hans/100-ui.ftl
	index 61e0c18..2809607 100644
	--- a/src/l10n/cmn-Hans/100-ui.ftl
	+++ b/src/l10n/cmn-Hans/100-ui.ftl
	@@ -1,243 +1,251 @@
	### This file is part of kazv.
	### SPDX-FileCopyrightText: 2020-2023 tusooa <tusooa@kazv.moe>
	### SPDX-License-Identifier: AGPL-3.0-or-later

	app-title = { -kt-app-name }

	user-name-with-id = { $name } （{ $userId }）

	global-drawer-title = { -kt-app-name }
	global-drawer-action-switch-account = 切换账号
	global-drawer-action-hard-logout = 登出
	global-drawer-action-save-session = 保存当前会话
	global-drawer-action-configure-shortcuts = 配置快捷键
	global-drawer-action-settings = 设置
	global-drawer-action-create-room = 创建房间
	global-drawer-action-join-room = 加入房间

	action-settings-page-title = 配置快捷键
	action-settings-shortcut-prompt = 快捷键：{ $shortcut }
	action-settings-shortcut-none = （无）
	action-settings-shortcut-edit-action = 编辑
	action-settings-shortcut-remove-action = 清除
	action-settings-shortcut-conflict-modal-title = 冲突的快捷键
	action-settings-shortcut-conflict = 快捷键 { $shortcut } 跟别的指令有冲突。<br>若要继续，别的指令的快捷键会被清除。<br><br>冲突的指令有：<br>{ $conflictingAction }
	action-settings-shortcut-conflict-continue = 继续
	action-settings-shortcut-conflict-cancel = 取消

	empty-room-page-title = 没有选中房间
	empty-room-page-description = 当前没有选中的房间。

	login-page-title = 登录
	login-page-userid-prompt = 用户 id：
	login-page-userid-input-placeholder = 例如： @foo:example.org
	login-page-password-prompt = 密码：
	login-page-login-button = 登录
	login-page-close-button = 关闭
	login-page-existing-sessions-prompt = 从已有会话中选一个：
	login-page-alternative-password-login-prompt = 或者用用户 id 和密码启动新会话：
	login-page-restore-session-button = 恢复会话
	login-page-request-failed-prompt = 登录失败。错误代码：{ $errorCode }。错误讯息：{ $errorMsg }。
	login-page-discover-failed-prompt = 不能检测此用户所在的服务器，或者服务器不可用。错误代码：{ $errorCode }。错误讯息：{ $errorMsg }。

	main-page-title = { -kt-app-name } - { $userId }
	main-page-recent-tab-title = 最近
	main-page-favourites-tab-title = 最爱
	main-page-people-tab-title = 人们
	main-page-rooms-tab-title = 房间

	room-list-view-room-item-title-name = { $name }
	room-list-view-room-item-title-heroes = { $hero } { $otherNum ->
	[0] { "" }
	[1] 和 { $secondHero }
	*[other] 和别的 { $otherNum } 个人
	}
	room-list-view-room-item-title-id = 未命名房间（{ $roomId }）
	room-list-view-room-item-fav-action = 设为最爱
	room-tags-fav-action-notification = 把 { $name } 设为了最爱
	room-tags-fav-action-notification-failed = 不能把 { $name } 设为最爱。错误代码：{ $errorCode }。错误讯息：{ $errorMsg }。
	room-tags-unfav-action-notification = 把 { $name } 从最爱中移除了
	room-tags-unfav-action-notification-failed = 不能把 { $name } 从最爱中移除。错误代码：{ $errorCode }。错误讯息：{ $errorMsg }。
	room-tags-add-tag-action-notification = 把标签 { $tag } 添加到了 { $name }
	room-tags-add-tag-action-notification-failed = 不能把标签 { $tag } 添加到 { $name }。错误代码：{ $errorCode }。错误讯息：{ $errorMsg }。
	room-tags-remove-tag-action-notification = 把标签 { $tag } 从 { $name } 移除了
	room-tags-remove-tag-action-notification-failed = 不能把标签 { $tag } 从 { $name } 移除。错误代码：{ $errorCode }。错误讯息：{ $errorMsg }。
	room-list-view-room-item-more-action = 更多...
	room-list-view-room-item-invited = （邀请）
	room-list-view-room-item-left = （已离开）

	room-settings-action = 房间设置...
	room-settings-page-title = { $room } 的房间设置
	room-settings-tags = 房间标签
	room-settings-favourited = 设为最爱
	room-settings-remove-tag = 移除标签
	room-settings-add-tag = 添加标签
	room-settings-members-action = 房间成员...
	room-settings-banned-members-action = 被封禁的成员...

	room-member-list-page-title = { $room } 的成员

	room-leave-action = 离开房间
	room-leave-confirm-popup-title = 离开房间
	room-leave-confirm-popup-message = 你确定要离开这个房间吗？
	room-leave-confirm-popup-confirm-action = 离开
	room-leave-confirm-popup-cancel-action = 留下

	send-message-box-input-placeholder = 在此输入您的讯息...
	send-message-box-send = 发送
	send-message-box-send-file = 发送文件
	send-message-box-reply-to = 回复给
	send-message-box-remove-reply-to-action = 移除回复关系

	room-timeline-load-more-action = 加载更多

	room-invite-accept-action = 接受邀请
	room-invite-reject-action = 拒绝邀请
	room-invite-popup-title = 被邀请了
	room-invite-popup-text = 你被邀请到这个房间了。
	room-invite-popup-text-with-inviter = 你被 { $inviterName } 邀请到这个房间了。

	## 状态事件
	## 通用参数：
	## gender = 发送者的性别（male/female/neutral）
	## stateKeyUser = state key 用户的名字
	## stateKeyUserGender = state key 用户的性别
	member-state-joined-room = 加入了房间。
	member-state-changed-name-and-avatar = 修改了名字和头像。
	member-state-changed-name = 修改了名字。
	member-state-changed-avatar = 修改了头像。
	member-state-invited = 把 { $stateKeyUser } 邀请到了本房间。
	member-state-left = 离开了房间。
	member-state-kicked = 踢出了 { $stateKeyUser }。
	member-state-banned = 封禁了 { $stateKeyUser }。
	member-state-unbanned = 解封了 { $stateKeyUser }。

	state-room-created = 创建了房间。
	state-room-name-changed = 把房间名字改成了 { $newName }。
	state-room-topic-changed = 把房间话题改成了 { $newTopic }。
	state-room-avatar-changed = 修改了房间头像。
	state-room-pinned-events-changed = 修改了房间的置顶讯息。
	state-room-alias-changed = 修改了房间的别名。
	state-room-join-rules-changed = 修改了房间的加入规则。
	state-room-power-levels-changed = 修改了房间的权限。
	state-room-encryption-activated = 对本房间启用了加密。

	event-message-image-sent = 发送了图片「{ $body }」。
	event-message-file-sent = 发送了文件「{ $body }」。
	event-message-video-sent = 发送了视频「{ $body }」。
	event-message-audio-sent = 发送了音频「{ $body }」。
	event-message-audio-play-audio = 播放音频
	event-sending = 发送中...
	event-send-failed = 发送失败
	event-resend = 重试发送这个事件
	event-deleted = （已删除）
	event-delete = 删除
	event-delete-failed = 删除事件出错。错误码：{ $errorCode }。错误讯息：{ $errorMsg }。
	event-view-source = 查看源码...
	event-source-popup-title = 事件源码
	event-source-decrypted = 解密的事件源码
	event-source-original = 原始的事件源码
	event-reply-action = 回复
	event-popup-action = 更多关于这个事件...
	event-reacted-with = 回应了「{ $key }」
	event-react-action = 回应...
	event-react-popup-title = 回应一条消息
	event-react-accept-action = 回应
	event-react-cancel-action = 取消
	event-react-with-prompt = 回应以：
	event-encrypted = 这条消息已加密

	media-file-menu-option-view = 查看
	media-file-menu-option-save-as = 保存为

	kazv-io-download-success-prompt = 下载成功
	kazv-io-download-failure-prompt = 下载失败：{ $detail }
	kazv-io-failure-detail-user-cancel = 用户已取消
	kazv-io-failure-detail-network-error = 网络错误
	kazv-io-failure-detail-open-file-error = 打开文件错误
	kazv-io-failure-detail-write-file-error = 写入文件错误
	kazv-io-failure-detail-hash-error = 哈息值校验失败
	kazv-io-failure-detail-kazv-error = 未知错误，请将此报告为漏洞
	kazv-io-upload-failure-prompt = 上传失败：{ $detail }
	kazv-io-downloading-prompt = 正在下载：{ $fileName }
	kazv-io-uploading-prompt = 正在上传：{ $fileName }
	kazv-io-prompt-close = 好的
	kazv-io-pause = 暂停
	kazv-io-resume = 继续
	kazv-io-cancel = 取消

	create-room-page-title = 创建房间
	create-room-page-visibility-prompt = 房间可见性：
	create-room-page-visibility-public = 公开
	create-room-page-visibility-private = 私有
	create-room-page-name-prompt = 房间名称（可选）：
	create-room-page-name-placeholder = 无名
	create-room-page-alias-prompt = 房间别名（可选）：
	create-room-page-alias-placeholder = #foo:example.org
	create-room-page-topic-prompt = 房间主题（可选）：
	create-room-page-topic-placeholder = 无题
	create-room-page-allow-federate-prompt = 允许别的服务器上的用户加入
	create-room-page-action-create-room = 创建房间
	create-room-page-success-prompt = 房间已创建。
	create-room-page-failed-prompt = 无法创建房间。错误代码：{ $errorCode }。错误讯息：{ $errorMsg }。

	join-room-page-title = 加入房间
	join-room-page-id-or-alias-prompt = 房间 id 或别名：
	join-room-page-id-or-alias-placeholder = #foo:example.org 或 !abcdef:example.org
	join-room-page-servers-prompt = 经由服务器（可选，用换行分割）：
	join-room-page-servers-placeholder =
	example.org
	example.com
	join-room-page-action-join-room = 加入房间
	join-room-page-success-prompt = 成功加入房间 { $room }。
	join-room-page-failed-prompt = 无法加入房间 { $room }。错误代码：{ $errorCode }。错误讯息：{ $errorMsg }。

	leave-room-success-prompt = 成功离开房间 { $room }。
	leave-room-failed-prompt = 无法离开房间 { $room }。错误代码：{ $errorCode }。错误讯息：{ $errorMsg }。

	device-trust-level-unseen = 未曾见过
	device-trust-level-seen = 见过
	device-trust-level-verified = 已验证
	device-trust-level-blocked = 已屏蔽
	device-set-trust-level = 设置信任等级...
	device-set-trust-level-dialog-title = 设置信任等级
	device-set-trust-level-dialog-name-label = 设备名：{ $name }
	device-set-trust-level-dialog-id-label = 设备id：{ $id }
	device-set-trust-level-dialog-ed25519-key-label = Ed25519公钥：{ $key }
	device-set-trust-level-dialog-curve25519-key-label = Curve25519公钥：{ $key }
	device-set-trust-level-dialog-save = 保存
	device-set-trust-level-dialog-cancel = 取消

	settings-page-title = 设置
	settings-save = 保存设置
	settings-profile-load-failed-prompt = 无法加载用户资料。错误码：{ $errorCode }。错误讯息：{ $errorMsg }。
	settings-profile-change-avatar = 改变头像...
	settings-profile-display-name = 显示名：
	settings-profile-save-failed-prompt = 无法保存用户资料。错误码：{ $errorCode }。错误讯息：{ $errorMsg }。
	settings-cache-directory = 缓存目录：

	typing-indicator = { $typingUser } { $otherNum ->
	[0] 正在输入...
	[1] 和 { $secondTypingUser } 正在输入...
	*[other] 和另外 { $otherNum } 人正在输入...
	}

	notification-message = <b>{ $user }：</b> { $message }
	notification-message-no-content = <b>{ $user }</b> 给你发了一条讯息。

	user-page-power-level = 权限等级：{ $powerLevel }
	user-page-edit-power-level-action = 编辑
	user-page-save-power-level-action = 保存
	user-page-discard-power-level-action = 丢弃
	user-page-set-power-level-failed-prompt = 无法设置权限等级。错误码：{ $errorCode }。错误讯息：{ $errorMsg }。
	user-page-kick-user-action = 踢出
	user-page-kick-user-confirm-dialog-title = 踢出用户
	user-page-kick-user-confirm-dialog-content = 确定要把 { $name }（{ $userId }）踢出 { $roomName } 吗？
	user-page-kick-user-reason-prompt = 原因（可选）：
	+
	user-page-ban-user-action = 封禁
	user-page-ban-user-confirm-dialog-titile = 封禁用户
	user-page-ban-user-confirm-dialog-content = 确定要在 { $roomName } 中封禁 { $name }（{ $userId }）吗？
	user-page-ban-user-reason-prompt = 原因（可选）：
	user-page-ban-user-failed-prompt = 无法封禁用户。错误码：{ $error }。错误讯息：{ $errorMsg }。
	user-page-unban-user-action = 解禁
	user-page-unban-user-failed-prompt = 无法解禁用户。错误码：{ $error }。错误讯息：{ $errorMsg }。
	+
	+room-invite-page-title = 邀请用户到 { $room }
	+room-invite-page-invite-failed-prompt = 无法邀请用户。错误码：{ $errorCode }。错误讯息：{ $errorMsg }。
	+room-invite-invitee-matrix-id-placeholder = 用户的 Matrix id，比如 @foo:example.org
	+room-invite-invitee-matrix-id-prompt = 要邀请的用户：
	+room-invite-page-invite-button = 邀请
	+room-invite-action = 邀请到房间...
	diff --git a/src/l10n/en/100-ui.ftl b/src/l10n/en/100-ui.ftl
	index cd31927..0597909 100644
	--- a/src/l10n/en/100-ui.ftl
	+++ b/src/l10n/en/100-ui.ftl
	@@ -1,255 +1,263 @@
	### This file is part of kazv.
	### SPDX-FileCopyrightText: 2020-2023 tusooa <tusooa@kazv.moe>
	### SPDX-License-Identifier: AGPL-3.0-or-later

	app-title = { -kt-app-name }

	user-name-with-id = { $name } ({ $userId })

	global-drawer-title = { -kt-app-name }
	global-drawer-action-switch-account = Switch account
	global-drawer-action-hard-logout = Logout
	global-drawer-action-save-session = Save current session
	global-drawer-action-configure-shortcuts = Configure shortcuts
	global-drawer-action-settings = Settings
	global-drawer-action-create-room = Create room
	global-drawer-action-join-room = Join room

	action-settings-page-title = Configure shortcuts
	action-settings-shortcut-prompt = Shortcut: { $shortcut }
	action-settings-shortcut-none = (none)
	action-settings-shortcut-edit-action = Edit
	action-settings-shortcut-remove-action = Clear
	action-settings-shortcut-conflict-modal-title = Conflicting shortcuts
	action-settings-shortcut-conflict = The shortcut { $shortcut } has conflicts with other actions. <br>If you continue, the shortcuts for other actions will be cleared. <br><br>Conflicting actions: <br>{ $conflictingAction }
	action-settings-shortcut-conflict-continue = Continue
	action-settings-shortcut-conflict-cancel = Cancel

	empty-room-page-title = No rooms selected
	empty-room-page-description = There is no room selected now.

	login-page-title = Log in
	login-page-userid-prompt = User id:
	login-page-userid-input-placeholder = E.g.: @foo:example.org
	login-page-password-prompt = Password:
	login-page-login-button = Log in
	login-page-close-button = Close
	login-page-existing-sessions-prompt = Choose from one of the existing sessions:
	login-page-alternative-password-login-prompt = Or start a new session with user id and password:
	login-page-restore-session-button = Restore session
	login-page-request-failed-prompt = Login failed. Error code: { $errorCode }. Error message: { $errorMsg }.
	login-page-discover-failed-prompt = Unable to detect the server this user is on, or the server is unavailable. Error code: { $errorCode }. Error message: { $errorMsg }.

	main-page-title = { -kt-app-name } - { $userId }
	main-page-recent-tab-title = Recent
	main-page-favourites-tab-title = Favourites
	main-page-people-tab-title = People
	main-page-rooms-tab-title = Rooms

	room-list-view-room-item-title-name = { $name }
	room-list-view-room-item-title-heroes = { $hero } { $otherNum ->
	[0] { "" }
	[1] and { $secondHero }
	*[other] and { $otherNum } others
	}
	room-list-view-room-item-title-id = Unnamed room ({ $roomId })
	room-list-view-room-item-fav-action = Set as favourite
	room-tags-fav-action-notification = Set { $name } as favourite
	room-tags-fav-action-notification-failed = Cannot set { $name } as favourite. Error code: { $errorCode }. Error message: { $errorMsg }.
	room-tags-unfav-action-notification = Removed { $name } from favourites
	room-tags-unfav-action-notification-failed = Cannot remove { $name } from favourites. Error code: { $errorCode }. Error message: { $errorMsg }.
	room-tags-add-tag-action-notification = Added tag { $tag } to { $name }
	room-tags-add-tag-action-notification-failed = Cannot add tag { $tag } to { $name }. Error code: { $errorCode }. Error message: { $errorMsg }.
	room-tags-remove-tag-action-notification = Removed tag { $tag } from { $name }
	room-tags-remove-tag-action-notification-failed = Cannot remove tag { $tag } from { $name }. Error code: { $errorCode }. Error message: { $errorMsg }.
	room-list-view-room-item-more-action = More...
	room-list-view-room-item-invited = (Invited)
	room-list-view-room-item-left = (Left)

	room-settings-action = Room settings...
	room-settings-page-title = Room settings for { $room }
	room-settings-tags = Room tags
	room-settings-favourited = Set as favourite
	room-settings-remove-tag = Remove tag
	room-settings-add-tag = Add tag
	room-settings-members-action = Room members...
	room-settings-banned-members-action = Banned members...

	room-member-list-page-title = Members of { $room }

	room-leave-action = Leave room
	room-leave-confirm-popup-title = Leaving room
	room-leave-confirm-popup-message = Are you sure you want to leave this room?
	room-leave-confirm-popup-confirm-action = Leave
	room-leave-confirm-popup-cancel-action = Stay

	send-message-box-input-placeholder = Type your message here...
	send-message-box-send = Send
	send-message-box-send-file = Send file
	send-message-box-reply-to = Replying to
	send-message-box-remove-reply-to-action = Remove reply-to relationship

	room-timeline-load-more-action = Load more

	room-invite-accept-action = Accept invite
	room-invite-reject-action = Reject invite
	room-invite-popup-title = Invited
	room-invite-popup-text = You are invited to join this room.
	room-invite-popup-text-with-inviter = You are invited to join this room by { $inviterName }.

	## State events
	## Common parameters:
	## gender = gender of the sender (male/female/neutral)
	## stateKeyUser = name of the state key user
	## stateKeyUserGender = gender of the state key user
	member-state-joined-room = joined the room.
	member-state-changed-name-and-avatar = changed { $gender ->
	[male] his
	[female] her
	*[neutral] their
	} name and avatar.
	member-state-changed-name = changed { $gender ->
	[male] his
	[female] her
	*[neutral] their
	} name.
	member-state-changed-avatar = changed { $gender ->
	[male] his
	[female] her
	*[neutral] their
	} avatar.
	member-state-invited = invited { $stateKeyUser } to the room.
	member-state-left = left the room.
	member-state-kicked = kicked { $stateKeyUser }.
	member-state-banned = banned { $stateKeyUser }.
	member-state-unbanned = unbanned { $stateKeyUser }.

	state-room-created = created the room.
	state-room-name-changed = changed the name of the room to { $newName }.
	state-room-topic-changed = changed the topic of the room to { $newTopic }.
	state-room-avatar-changed = changed the avatar of the room.
	state-room-pinned-events-changed = changed the pinned events of the room.
	state-room-alias-changed = changed the aliases of the room.
	state-room-join-rules-changed = changed join rules of the room.
	state-room-power-levels-changed = changed power levels of the room.
	state-room-encryption-activated = enabled encryption for this room.

	event-message-image-sent = sent an image "{ $body }".
	event-message-file-sent = sent a file "{ $body }".
	event-message-video-sent = sent a video "{ $body }".
	event-message-audio-sent = sent an audio "{ $body }".
	event-message-audio-play-audio = Play audio
	event-sending = Sending...
	event-send-failed = Failed to send
	event-resend = Retry sending this event
	event-deleted = (Deleted)
	event-delete = Delete
	event-delete-failed = Error deleting event. Error code: { $errorCode }. Error message: { $errorMsg }.
	event-view-source = View source...
	event-source-popup-title = Event source
	event-source-decrypted = Decrypted event source
	event-source-original = Original event source
	event-reply-action = Reply
	event-popup-action = More about this event...
	event-reacted-with = Reacted with "{ $key }"
	event-react-action = React...
	event-react-popup-title = React to a message
	event-react-accept-action = React
	event-react-cancel-action = Cancel
	event-react-with-prompt = React with:
	event-encrypted = This message is encrypteed

	media-file-menu-option-view = View
	media-file-menu-option-save-as = Save as

	kazv-io-download-success-prompt = Download successful
	kazv-io-download-failure-prompt = Download failure: { $detail }
	kazv-io-failure-detail-user-cancel = User canceled
	kazv-io-failure-detail-network-error = Network error
	kazv-io-failure-detail-open-file-error = Open file error
	kazv-io-failure-detail-write-file-error = Write file error
	kazv-io-failure-detail-hash-error = Hash check error
	kazv-io-failure-detail-kazv-error = Unknow Error, please report this as bug.
	kazv-io-upload-failure-prompt = Upload failure: { $detail }
	kazv-io-downloading-prompt = Downloading: { $fileName }
	kazv-io-uploading-prompt = Uploading: { $fileName }
	kazv-io-prompt-close = Got it
	kazv-io-pause = Pause
	kazv-io-resume = Resume
	kazv-io-cancel = Cancel

	create-room-page-title = Create room
	create-room-page-visibility-prompt = Room visibility:
	create-room-page-visibility-public = Public
	create-room-page-visibility-private = Private
	create-room-page-name-prompt = Room name (optional):
	create-room-page-name-placeholder = No name
	create-room-page-alias-prompt = Room alias (optional):
	create-room-page-alias-placeholder = #foo:example.org
	create-room-page-topic-prompt = Room topic (optional):
	create-room-page-topic-placeholder = No topic
	create-room-page-allow-federate-prompt = Allow users from other servers to join
	create-room-page-action-create-room = Create room
	create-room-page-success-prompt = Room created.
	create-room-page-failed-prompt = Unable to create room. Error code: { $errorCode }. Error message: { $errorMsg }.

	join-room-page-title = Join room
	join-room-page-id-or-alias-prompt = Room id or alias:
	join-room-page-id-or-alias-placeholder = #foo:example.org or !abcdef:example.org
	join-room-page-servers-prompt = Via servers (optional, separated by newlines):
	join-room-page-servers-placeholder =
	example.org
	example.com
	join-room-page-action-join-room = Join room
	join-room-page-success-prompt = Successfully joined room { $room }.
	join-room-page-failed-prompt = Unable to join room { $room }. Error code: { $errorCode }. Error message: { $errorMsg }.

	leave-room-success-prompt = Successfully left room { $room }.
	leave-room-failed-prompt = Unable to leave room { $room }. Error code: { $errorCode }. Error message: { $errorMsg }.

	device-trust-level-unseen = Unseen
	device-trust-level-seen = Seen
	device-trust-level-verified = Verified
	device-trust-level-blocked = Blocked
	device-set-trust-level = Set trust level...
	device-set-trust-level-dialog-title = Set trust level
	device-set-trust-level-dialog-name-label = Device name: { $name }
	device-set-trust-level-dialog-id-label = Device id: { $id }
	device-set-trust-level-dialog-ed25519-key-label = Ed25519 public key: { $key }
	device-set-trust-level-dialog-curve25519-key-label = Curve25519 public key: { $key }
	device-set-trust-level-dialog-save = Save
	device-set-trust-level-dialog-cancel = Cancel

	settings-page-title = Settings
	settings-save = Save settings
	settings-profile-load-failed-prompt = Unable to load profile. Error code: { $errorCode }. Error message: { $errorMsg }.
	settings-profile-change-avatar = Change avatar...
	settings-profile-display-name = Display name:
	settings-profile-save-failed-prompt = Unable to save profile. Error code: { $errorCode }. Error message: { $errorMsg }.
	settings-cache-directory = Cache directory:

	typing-indicator = { $typingUser } { $otherNum ->
	[0] is typing...
	[1] and { $secondTypingUser } are typing...
	*[other] and { $otherNum } others are typing...
	}

	notification-message = <b>{ $user }:</b> { $message }
	notification-message-no-content = <b>{ $user }</b> sent you a message.

	user-page-power-level = Power level: { $powerLevel }
	user-page-edit-power-level-action = Edit
	user-page-save-power-level-action = Save
	user-page-discard-power-level-action = Discard
	user-page-set-power-level-failed-prompt = Unable to set power level. Error code: { $errorCode }. Error message: { $errorMsg }.
	user-page-kick-user-action = Kick
	user-page-kick-user-confirm-dialog-title = Kicking user
	user-page-kick-user-confirm-dialog-content = Are you sure you want to kick { $name } ({ $userId }) out of { $roomName }?
	user-page-kick-user-reason-prompt = Reason (optional):
	+
	user-page-ban-user-action = Ban
	user-page-ban-user-confirm-dialog-title = Banning user
	user-page-ban-user-confirm-dialog-content = Are you sure you want to ban { $name } ({ $userId }) in { $roomName }?
	user-page-ban-user-reason-prompt = Reason (optional):
	user-page-ban-user-failed-prompt = Unable to ban user. Error code: { $errorCode }. Error message: { $errorMsg }.
	user-page-unban-user-action = Unban
	user-page-unban-user-failed-prompt = Unable to unban user. Error code: { $errorCode }. Error message: { $errorMsg }.
	+
	+room-invite-page-title = Inviting user to { $room }
	+room-invite-page-invite-failed-prompt = Unable to invite user. Error code: { $errorCode }. Error message: { $errorMsg }.
	+room-invite-invitee-matrix-id-placeholder = Matrix id of the user, e.g. @foo:example.org
	+room-invite-invitee-matrix-id-prompt = User to invite:
	+room-invite-page-invite-button = Invite
	+room-invite-action = Invite to room...
	diff --git a/src/matrix-room.cpp b/src/matrix-room.cpp
	index 85bee1a..d8dfb24 100644
	--- a/src/matrix-room.cpp
	+++ b/src/matrix-room.cpp
	@@ -1,389 +1,394 @@
	/*
	* This file is part of kazv.
	* SPDX-FileCopyrightText: 2020-2024 tusooa <tusooa@kazv.moe>
	* SPDX-License-Identifier: AGPL-3.0-or-later
	*/
	#include <libkazv-config.hpp>

	#include <immer/config.hpp> // https://github.com/arximboldi/immer/issues/168

	#include <lager/setter.hpp>
	#include <nlohmann/json.hpp>
	#include <event.hpp>

	#include <QFile>
	#include <QMimeDatabase>

	#include "kazv-log.hpp"
	#include "matrix-room.hpp"
	#include "matrix-room-timeline.hpp"
	#include "matrix-room-member.hpp"
	#include "matrix-room-member-list-model.hpp"
	#include "matrix-promise.hpp"
	#include "matrix-event.hpp"

	#include "qfunctionutils.hpp"

	#include "helper.hpp"

	using namespace Kazv;

	static const int typingDebounceMs = 500;
	static const int saveDraftDebounceMs = 5000;
	static const int typingTimeoutMs = 1000;

	MatrixRoom::MatrixRoom(Kazv::Room room, lager::reader<std::string> selfUserId, QObject *parent)
	: QObject(parent)
	, m_room(room)
	, m_selfUserId(selfUserId)
	, m_memberNames(m_room.members())
	, m_powerLevels(m_room.powerLevels())
	, LAGER_QT(roomId)(m_room.roomId().xform(strToQt))
	, LAGER_QT(name)(m_room.nameOpt()[lager::lenses::or_default].xform(strToQt))
	, LAGER_QT(heroNames)(m_room.heroDisplayNames().xform(strListToQt))
	, LAGER_QT(avatarMxcUri)(m_room.avatarMxcUri().xform(strToQt))
	, LAGER_QT(roomOrHeroAvatarMxcUri)(lager::with(m_room.heroMemberEvents(), m_room.avatarMxcUri())
	.map([](const auto &heroes, const auto &roomAvatar) {
	if (!roomAvatar.empty()) {
	return roomAvatar;
	}
	if (heroes.size() == 1) {
	return zug::reduce(roomMemberToAvatar(zug::last), std::string(), heroes);
	}
	return std::string();
	})
	.xform(strToQt))
	, LAGER_QT(localDraft)(m_room.localDraft().xform(strToQt))
	, LAGER_QT(encrypted)(m_room.encrypted())
	, LAGER_QT(memberNames)(m_memberNames.xform(strListToQt))
	, LAGER_QT(tagIds)(m_room.tags().map([](const auto &tagsMap) {
	return zug::into(
	QStringList(),
	zug::map([](const auto pair) {
	return QString::fromStdString(pair.first);
	}),
	tagsMap);
	}))
	, LAGER_QT(membership)(m_room.membership().map([](const auto &membership) { return static_cast<Membership>(membership); }))
	, m_setTypingThrottled(QFunctionUtils::Throttle([self=QPointer<MatrixRoom>(this)]() {
	if (self) {
	self->setTypingImpl();
	}
	}, typingDebounceMs))
	, m_updateLocalDraftDebounced(QFunctionUtils::Debounce([self=QPointer<MatrixRoom>(this)]() {
	if (self) {
	self->updateLocalDraftNow();
	}
	}, saveDraftDebounceMs))
	, m_internalLocalDraft(std::nullopt)
	{
	lager::watch(m_powerLevels, [this](auto &&) {
	powerLevelsChanged();
	});
	}

	MatrixRoom::~MatrixRoom() {
	updateLocalDraftNow();
	}

	MatrixRoomTimeline *MatrixRoom::timeline() const
	{
	return new MatrixRoomTimeline(m_room);
	}

	static nlohmann::json makeTextMessageJson(QString text, QString replyTo)
	{
	auto msg = nlohmann::json{
	{"type", "m.room.message"},
	{"content", {
	{"msgtype", "m.text"},
	{"body", text},
	}},
	};

	if (!replyTo.isEmpty()) {
	msg["content"]["m.relates_to"] = nlohmann::json{
	{"m.in_reply_to", {
	{"event_id", replyTo},
	}},
	};
	}

	return msg;
	}

	void MatrixRoom::sendTextMessage(QString text, QString replyTo) const
	{
	auto j = makeTextMessageJson(text, replyTo);
	m_room.sendMessage(Event(j));
	}

	void MatrixRoom::sendMediaFileMessage(QString fileName, QString mimeType, qint64 fileSize, QString mxcUri) const
	{
	auto j = makeMediaFileMessageJson(fileName, mimeType, fileSize, mxcUri);
	Kazv::Event e{j};
	m_room.sendMessage(e);
	}

	void MatrixRoom::sendEncryptedFileMessage(const QString &fileName, const QString &mimeType,
	const qint64 fileSize, const QString &mxcUri,
	const QString &key, const QString &iv, const QByteArray &hash) const
	{
	auto j = makeEncryptedFileMessageJson(fileName, mimeType, fileSize, mxcUri, key, iv, hash);
	Kazv::Event e{j};
	m_room.sendMessage(e);
	}

	static nlohmann::json makeReactionJson(QString text, QString relatedTo)
	{
	auto msg = nlohmann::json{
	{"type", "m.reaction"},
	{"content", {
	{"m.relates_to", {
	{"rel_type", "m.annotation"},
	{"event_id", relatedTo.toStdString()},
	{"key", text.toStdString()},
	}},
	}},
	};

	return msg;
	}

	void MatrixRoom::sendReaction(QString text, QString relatedTo) const
	{
	auto j = makeReactionJson(text, relatedTo);
	m_room.sendMessage(Event(j));
	}

	void MatrixRoom::resendMessage(QString txnId) const
	{
	m_room.resendMessage(txnId.toStdString());
	}

	nlohmann::json MatrixRoom::makeMediaFileMessageJson(QString fileName, QString mimeType, qint64 fileSize, QString mxcUri) const
	{
	static auto available_msgtype = std::array<std::string, 3>{"m.audio", "m.video", "m.image"};
	auto try_msgtype = std::find(available_msgtype.begin(), available_msgtype.end(),
	QStringLiteral("m.").append(mimeType.split(QChar('/'))[0]).toStdString());
	std::string msgtype;
	if (try_msgtype == available_msgtype.end()) {
	msgtype = "m.file";
	} else {
	msgtype = *try_msgtype;
	}
	return nlohmann::json {
	{"type", "m.room.message"},
	{"content", {
	{"msgtype", msgtype},
	{"body", fileName.toStdString()},
	{"url", mxcUri.toStdString()},
	{"info", {
	{"size", fileSize},
	{"mimetype", mimeType.toStdString()}
	}}
	}}
	};
	}

	nlohmann::json MatrixRoom::makeEncryptedFileMessageJson(const QString &fileName, const QString &mimeType,
	const qint64 fileSize, const QString &mxcUri,
	const QString &key, const QString &iv, const QByteArray &hash) const
	{
	static auto available_msgtype = std::array<std::string, 3>{"m.audio", "m.video", "m.image"};
	auto try_msgtype = std::find(available_msgtype.begin(), available_msgtype.end(),
	QStringLiteral("m.").append(mimeType.split(QChar('/'))[0]).toStdString());
	std::string msgtype;
	if (try_msgtype == available_msgtype.end()) {
	msgtype = "m.file";
	} else {
	msgtype = *try_msgtype;
	}
	return nlohmann::json {
	{"type", "m.room.message"},
	{"content", {
	{"msgtype", msgtype},
	{"body", fileName.toStdString()},
	{"file", {
	{"url", mxcUri.toStdString()},
	{"key", {
	{"kty", "oct"},
	{"key_ops", nlohmann::json::array({"encrypt", "decrypt"})},
	{"alg", "A256CTR"},
	{"k", key.toStdString()},
	{"ext", true}
	}},
	{"iv", iv.toStdString()},
	{"hashes", {
	{"sha256", hash.toStdString()}
	}},
	{"v", "v2"}
	}},
	{"info", {
	{"size", fileSize},
	{"mimetype", mimeType.toStdString()}
	}}
	}}
	};
	}

	MatrixPromise *MatrixRoom::redactEvent(QString eventId, QString reason) const
	{
	qCInfo(kazvLog) << "redactEvent(" << eventId << ", " << reason << ")";
	return new MatrixPromise(m_room.redactEvent(
	eventId.toStdString(),
	reason.isEmpty() ? std::nullopt : std::optional<std::string>(reason.toStdString())
	));
	}

	MatrixPromise *MatrixRoom::addOrSetTag(QString tagId) const
	{
	return new MatrixPromise(m_room.addOrSetTag(tagId.toStdString()));
	}

	MatrixPromise *MatrixRoom::removeTag(QString tagId) const
	{
	return new MatrixPromise(m_room.removeTag(tagId.toStdString()));
	}

	MatrixPromise *MatrixRoom::paginateBackFrom(QString eventId) const
	{
	return new MatrixPromise(m_room.paginateBackFromEvent(eventId.toStdString()));
	}

	MatrixPromise *MatrixRoom::leaveRoom() const
	{
	return new MatrixPromise(m_room.leave());
	}

	MatrixRoomMember *MatrixRoom::memberAt(int index) const
	{
	return new MatrixRoomMember(m_room.memberEventByCursor(
	m_memberNames[index][lager::lenses::or_default]));
	}

	MatrixRoomMember *MatrixRoom::member(QString userId) const
	{
	return new MatrixRoomMember(m_room.memberEventFor(userId.toStdString()));
	}

	MatrixEvent *MatrixRoom::messageById(QString eventId) const
	{
	return new MatrixEvent(
	m_room.message(lager::make_constant(eventId.toStdString()))
	.map([](const auto &e) -> std::variant<Kazv::Event, Kazv::LocalEchoDesc> { return e; })
	);
	}

	MatrixRoomMemberListModel *MatrixRoom::typingUsers() const
	{
	return new MatrixRoomMemberListModel(
	m_room.typingMemberEvents()
	.xform(containerMap(EventList{}, zug::filter([self=m_selfUserId.make().get()](const auto &e) {
	return e.stateKey() != self;
	})))
	);
	}

	void MatrixRoom::setTyping(bool typing)
	{
	if (typing) {
	m_setTypingThrottled();
	} else {
	m_room.setTyping(false, std::nullopt);
	}
	}

	void MatrixRoom::setTypingImpl()
	{
	m_room.setTyping(true, typingTimeoutMs);
	}

	void MatrixRoom::setLocalDraft(QString localDraft)
	{
	// To avoid heavy computations when updating the local draft again
	// and again, we only set our internal state. **Assume only
	// one MatrixRoom can deal with the local draft** at the same time,
	// it is safe to update it debounced and when we are destructed.
	// See also the destructor.
	m_internalLocalDraft = localDraft;
	m_updateLocalDraftDebounced();
	}

	void MatrixRoom::updateLocalDraftNow()
	{
	if (m_internalLocalDraft.has_value()) {
	m_room.setLocalDraft(m_internalLocalDraft.value().toStdString());
	m_internalLocalDraft = std::nullopt;
	}
	}

	MatrixRoomMemberListModel *MatrixRoom::members() const
	{
	return new MatrixRoomMemberListModel(
	m_room.joinedMemberEvents()
	);
	}

	MatrixRoomMemberListModel *MatrixRoom::bannedMembers() const
	{
	return new MatrixRoomMemberListModel(
	m_room.bannedMemberEvents()
	);
	}

	qint64 MatrixRoom::userPowerLevel(const QString &userId) const
	{
	auto e = m_powerLevels.get().normalizedEvent().content().get();
	auto userIdStd = userId.toStdString();
	return e.at("users").contains(userIdStd)
	? e.at("users")[userIdStd].template get<Kazv::PowerLevel>()
	: e.at("users_default").template get<Kazv::PowerLevel>();
	}

	MatrixPromise *MatrixRoom::setUserPowerLevel(const QString &userId, qint64 powerLevel) const
	{
	auto next = m_powerLevels.get().setUser(userId.toStdString(), powerLevel);
	return new MatrixPromise(m_room.sendStateEvent(next.originalEvent()));
	}

	MatrixPromise *MatrixRoom::unsetUserPowerLevel(const QString &userId) const
	{
	auto next = m_powerLevels.get().setUser(userId.toStdString(), std::nullopt);
	return new MatrixPromise(m_room.sendStateEvent(next.originalEvent()));
	}

	MatrixPromise *MatrixRoom::getStateEvent(const QString &type, const QString &stateKey) const
	{
	return new MatrixPromise(m_room.getStateEvent(
	type.toStdString(), stateKey.toStdString()
	));
	}

	MatrixPromise *MatrixRoom::ensureStateEvent(const QString &type, const QString &stateKey) const
	{
	if (m_room
	.stateOpt({type.toStdString(), stateKey.toStdString()})
	.make()
	.get()
	.has_value()) {
	return MatrixPromise::createResolved(true, QJsonObject());
	} else {
	return getStateEvent(type, stateKey);
	}
	}

	MatrixPromise *MatrixRoom::kickUser(const QString &userId, const QString &reason) const
	{
	return new MatrixPromise(m_room.kick(userId.toStdString(), reason.toStdString()));
	}

	MatrixPromise *MatrixRoom::banUser(const QString &userId, const QString &reason) const
	{
	return new MatrixPromise(m_room.ban(userId.toStdString(), reason.toStdString()));
	}

	MatrixPromise *MatrixRoom::unbanUser(const QString &userId) const
	{
	return new MatrixPromise(m_room.unban(userId.toStdString()));
	}
	+
	+MatrixPromise *MatrixRoom::inviteUser(const QString &userId) const
	+{
	+ return new MatrixPromise(m_room.invite(userId.toStdString()));
	+}
	diff --git a/src/matrix-room.hpp b/src/matrix-room.hpp
	index 3251030..17798a0 100644
	--- a/src/matrix-room.hpp
	+++ b/src/matrix-room.hpp
	@@ -1,137 +1,139 @@
	/*
	* This file is part of kazv.
	* SPDX-FileCopyrightText: 2020-2024 tusooa <tusooa@kazv.moe>
	* SPDX-License-Identifier: AGPL-3.0-or-later
	*/

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

	#include <immer/config.hpp> // https://github.com/arximboldi/immer/issues/168

	#include <QObject>
	#include <QQmlEngine>
	#include <QUrl>
	#include <QTimer>

	#include <lager/extra/qt.hpp>

	#include <client/room/room.hpp>

	class MatrixRoomTimeline;
	class MatrixRoomMember;
	class MatrixPromise;
	class MatrixRoomMemberListModel;
	class MatrixEvent;

	class MatrixRoom : public QObject
	{
	Q_OBJECT
	QML_ELEMENT
	QML_UNCREATABLE("")

	Kazv::Room m_room;
	lager::reader<std::string> m_selfUserId;
	lager::reader<immer::flex_vector<std::string>> m_memberNames;
	lager::reader<Kazv::PowerLevelsDesc> m_powerLevels;

	public:
	enum Membership {
	Invite = Kazv::RoomMembership::Invite,
	Join = Kazv::RoomMembership::Join,
	Leave = Kazv::RoomMembership::Leave,
	};
	Q_ENUM(Membership);

	explicit MatrixRoom(Kazv::Room room, lager::reader<std::string> selfUserId, QObject *parent = 0);
	~MatrixRoom() override;

	LAGER_QT_READER(QString, roomId);
	LAGER_QT_READER(QString, name);
	LAGER_QT_READER(QStringList, heroNames);
	LAGER_QT_READER(QString, avatarMxcUri);
	LAGER_QT_READER(QString, roomOrHeroAvatarMxcUri);
	LAGER_QT_READER(QString, localDraft);
	LAGER_QT_READER(bool, encrypted);

	LAGER_QT_READER(QStringList, memberNames);
	LAGER_QT_READER(QStringList, tagIds);
	LAGER_QT_READER(Membership, membership);

	Q_INVOKABLE MatrixRoomMember *memberAt(int index) const;

	Q_INVOKABLE MatrixRoomMember *member(QString userId) const;

	Q_INVOKABLE MatrixRoomTimeline *timeline() const;

	Q_INVOKABLE MatrixEvent *messageById(QString eventId) const;

	Q_INVOKABLE void sendTextMessage(QString text, QString replyTo) const;

	Q_INVOKABLE void sendMediaFileMessage(QString fileName, QString mimeType,
	qint64 fileSize, QString mxcUri) const;

	Q_INVOKABLE void sendEncryptedFileMessage(const QString &fileName, const QString& mimeType,
	const qint64 fileSize, const QString& mxcUri,
	const QString &key, const QString &iv, const QByteArray &hash) const;

	Q_INVOKABLE void sendReaction(QString text, QString relatedTo) const;

	Q_INVOKABLE void resendMessage(QString txnId) const;

	Q_INVOKABLE MatrixPromise *redactEvent(QString eventId, QString reason) const;

	Q_INVOKABLE MatrixRoomMemberListModel *typingUsers() const;

	Q_INVOKABLE void setTyping(bool typing);

	Q_INVOKABLE void setLocalDraft(QString localDraft);

	Q_INVOKABLE void updateLocalDraftNow();

	Q_INVOKABLE MatrixPromise *addOrSetTag(QString tagId) const;

	Q_INVOKABLE MatrixPromise *removeTag(QString tagId) const;

	Q_INVOKABLE MatrixPromise *paginateBackFrom(QString eventId) const;

	Q_INVOKABLE MatrixPromise *leaveRoom() const;

	Q_INVOKABLE MatrixRoomMemberListModel *members() const;

	Q_INVOKABLE MatrixRoomMemberListModel *bannedMembers() const;

	Q_INVOKABLE qint64 userPowerLevel(const QString &userId) const;

	Q_INVOKABLE MatrixPromise *setUserPowerLevel(const QString &userId, qint64 powerLevel) const;

	Q_INVOKABLE MatrixPromise *unsetUserPowerLevel(const QString &userId) const;

	Q_INVOKABLE MatrixPromise *getStateEvent(const QString &type, const QString &stateKey) const;

	Q_INVOKABLE MatrixPromise *ensureStateEvent(const QString &type, const QString &stateKey) const;

	Q_INVOKABLE MatrixPromise *kickUser(const QString &userId, const QString &reason) const;

	Q_INVOKABLE MatrixPromise *banUser(const QString &userId, const QString &reason = "") const;

	Q_INVOKABLE MatrixPromise *unbanUser(const QString &userId) const;

	+ Q_INVOKABLE MatrixPromise *inviteUser(const QString &userId) const;
	+
	Q_SIGNALS:
	void powerLevelsChanged();

	protected:
	nlohmann::json makeMediaFileMessageJson(QString fileName, QString mimeType,
	qint64 fileSize, QString mxcUri) const;
	nlohmann::json makeEncryptedFileMessageJson(const QString &fileName, const QString &mimeType,
	const qint64 fileSize, const QString &mxcUri,
	const QString &key, const QString &iv, const QByteArray &hash) const;

	private Q_SLOTS:
	void setTypingImpl();

	private:
	std::function<void()> m_setTypingThrottled;
	std::function<void()> m_updateLocalDraftDebounced;
	std::optional<QString> m_internalLocalDraft;
	};
	diff --git a/src/resources.qrc b/src/resources.qrc
	index 28f7391..7ee135a 100644
	--- a/src/resources.qrc
	+++ b/src/resources.qrc
	@@ -1,76 +1,77 @@
	<RCC>
	<qresource prefix="/">
	<file alias="main.qml">contents/ui/main.qml</file>
	<file alias="LoginPage.qml">contents/ui/LoginPage.qml</file>
	<file alias="MainPage.qml">contents/ui/MainPage.qml</file>
	<file alias="TabView.qml">contents/ui/TabView.qml</file>
	<file alias="Tab.qml">contents/ui/Tab.qml</file>
	<file alias="RoomListView.qml">contents/ui/RoomListView.qml</file>
	<file alias="RoomListViewItemDelegate.qml">contents/ui/RoomListViewItemDelegate.qml</file>
	<file alias="RoomPage.qml">contents/ui/RoomPage.qml</file>
	<file alias="RoomTimelineView.qml">contents/ui/RoomTimelineView.qml</file>
	<file alias="SendMessageBox.qml">contents/ui/SendMessageBox.qml</file>
	<file alias="EventView.qml">contents/ui/EventView.qml</file>
	<file alias="EventViewWrapper.qml">contents/ui/EventViewWrapper.qml</file>
	<file alias="EventViewCompact.qml">contents/ui/EventViewCompact.qml</file>
	<file alias="EventSourceView.qml">contents/ui/EventSourceView.qml</file>
	<file alias="Bubble.qml">contents/ui/Bubble.qml</file>
	<file alias="MediaFileMenu.qml">contents/ui/MediaFileMenu.qml</file>
	<file alias="KazvIOMenu.qml">contents/ui/KazvIOMenu.qml</file>
	<file alias="ConfirmationOverlay.qml">contents/ui/ConfirmationOverlay.qml</file>
	<file alias="event-types/Simple.qml">contents/ui/event-types/Simple.qml</file>
	<file alias="event-types/Text.qml">contents/ui/event-types/Text.qml</file>
	<file alias="event-types/Emote.qml">contents/ui/event-types/Emote.qml</file>
	<file alias="event-types/Notice.qml">contents/ui/event-types/Notice.qml</file>
	<file alias="event-types/State.qml">contents/ui/event-types/State.qml</file>
	<file alias="event-types/TextTemplate.qml">contents/ui/event-types/TextTemplate.qml</file>
	<file alias="event-types/Image.qml">contents/ui/event-types/Image.qml</file>
	<file alias="event-types/File.qml">contents/ui/event-types/File.qml</file>
	<file alias="event-types/Video.qml">contents/ui/event-types/Video.qml</file>
	<file alias="event-types/Audio.qml">contents/ui/event-types/Audio.qml</file>
	<file alias="event-types/MediaBubble.qml">contents/ui/event-types/MediaBubble.qml</file>
	<file alias="event-types/Redacted.qml">contents/ui/event-types/Redacted.qml</file>
	<file alias="event-types/Reaction.qml">contents/ui/event-types/Reaction.qml</file>
	<file alias="TypingIndicator.qml">contents/ui/TypingIndicator.qml</file>
	<file alias="SelectableText.qml">contents/ui/SelectableText.qml</file>
	<file alias="ReactToEventPopup.qml">contents/ui/ReactToEventPopup.qml</file>
	<file alias="FileHandler.qml">contents/ui/FileHandler.qml</file>

	<file alias="ActionSettingsPage.qml">contents/ui/ActionSettingsPage.qml</file>
	<file alias="CreateRoomPage.qml">contents/ui/CreateRoomPage.qml</file>
	<file alias="JoinRoomPage.qml">contents/ui/JoinRoomPage.qml</file>
	<file alias="RoomMemberListView.qml">contents/ui/RoomMemberListView.qml</file>
	<file alias="RoomMemberListViewItemDelegate.qml">contents/ui/RoomMemberListViewItemDelegate.qml</file>

	<file alias="AsyncHandler.qml">contents/ui/AsyncHandler.qml</file>
	<file alias="UploadFileHelper.qml">contents/ui/UploadFileHelper.qml</file>
	<file alias="SettingsPage.qml">contents/ui/SettingsPage.qml</file>
	<file alias="settings/ProfileSettings.qml">contents/ui/settings/ProfileSettings.qml</file>
	<file alias="settings/CacheSettings.qml">contents/ui/settings/CacheSettings.qml</file>

	<file alias="room-settings/RoomSettingsPage.qml">contents/ui/room-settings/RoomSettingsPage.qml</file>
	<file alias="room-settings/RoomTagHandler.qml">contents/ui/room-settings/RoomTagHandler.qml</file>
	<file alias="room-settings/RoomMemberListPage.qml">contents/ui/room-settings/RoomMemberListPage.qml</file>
	+ <file alias="room-settings/RoomInvitePage.qml">contents/ui/room-settings/RoomInvitePage.qml</file>

	<file alias="device-mgmt/Device.qml">contents/ui/device-mgmt/Device.qml</file>
	<file alias="device-mgmt/DeviceList.qml">contents/ui/device-mgmt/DeviceList.qml</file>

	<file alias="UserPage.qml">contents/ui/UserPage.qml</file>

	<file alias="shortcuts/ActionCollection.qml">contents/ui/shortcuts/ActionCollection.qml</file>
	<file alias="shortcuts/ActionItem.qml">contents/ui/shortcuts/ActionItem.qml</file>
	<file alias="shortcuts/ActionSettings.qml">contents/ui/shortcuts/ActionSettings.qml</file>
	<file alias="shortcuts/ShortcutInput.qml">contents/ui/shortcuts/ShortcutInput.qml</file>

	<file alias="MessageNotification.qml">contents/ui/MessageNotification.qml</file>
	<file alias="Notifier.qml">contents/ui/Notifier.qml</file>

	<file alias="l10n.js">js/l10n.js</file>
	<file alias="fluent-bundle.js">js/transformed-libs/fluent-bundle.js</file>
	<file alias="fluent-sequence.js">js/transformed-libs/fluent-sequence.js</file>
	<file alias="fluent-langneg.js">js/transformed-libs/fluent-langneg.js</file>
	<file alias="bundled-deps.js">js/transformed-libs/bundled-deps.js</file>
	<file alias="global-this.js">js/global-this.js</file>
	<file alias="matrix-helpers.js">js/matrix-helpers.js</file>
	</qresource>
	</RCC>
	diff --git a/src/tests/quick-tests/tst_RoomInvitePage.qml b/src/tests/quick-tests/tst_RoomInvitePage.qml
	new file mode 100644
	index 0000000..e62ba15
	--- /dev/null
	+++ b/src/tests/quick-tests/tst_RoomInvitePage.qml
	@@ -0,0 +1,97 @@
	+/*
	+ * This file is part of kazv.
	+ * SPDX-FileCopyrightText: 2023 tusooa <tusooa@kazv.moe>
	+ * SPDX-License-Identifier: AGPL-3.0-or-later
	+ */
	+
	+import QtQuick 2.15
	+import QtQuick.Layouts 1.15
	+import QtTest 1.0
	+
	+import '../../contents/ui/room-settings' as RoomSettings
	+import 'test-helpers.js' as Helpers
	+import 'test-helpers' as TestHelpers
	+
	+Item {
	+ id: item
	+ width: 800
	+ height: 600
	+
	+ property var promiseComp: Component {
	+ TestHelpers.MatrixPromiseMock {
	+ }
	+ }
	+
	+ property var showPassiveNotification: (() => {})
	+ property var pageStack: ({
	+ removePage (page) {
	+ ++item.pageStack._removePageCalled;
	+ },
	+ _removePageCalled: 0,
	+ })
	+
	+ property var room: ({
	+ name: 'room',
	+ inviteUser (userId) {
	+ ++item.room._inviteUserCalled;
	+ item.room._inviteUserUserId = userId;
	+ const promise = promiseComp.createObject(item.room);
	+ item.room._inviteUserPromise = promise;
	+ return promise;
	+ },
	+ _inviteUserCalled: 0,
	+ _inviteUserUserId: undefined,
	+ _inviteUserPromise: undefined,
	+ })
	+ property var l10n: Helpers.fluentMock
	+ property var matrixSdk: TestHelpers.MatrixSdkMock {}
	+ property var sdkVars: ({})
	+
	+ RoomSettings.RoomInvitePage {
	+ id: roomInvitePage
	+ room: item.room
	+ }
	+
	+ TestCase {
	+ id: roomInvitePageTest
	+ name: 'RoomInvitePageTest'
	+ when: windowShown
	+
	+ function cleanup() {
	+ item.room._inviteUserCalled = 0;
	+ item.room._inviteUserPromise = undefined;
	+ item.room._inviteUserUserId = undefined;
	+ item.pageStack._removePageCalled = 0;
	+ }
	+
	+ function test_roomInvitePage() {
	+ const input = findChild(roomInvitePage, 'inviteUserIdInput');
	+ input.text = '@mew:example.com';
	+
	+ const button = findChild(roomInvitePage, 'inviteUserButton');
	+ mouseClick(button);
	+ tryVerify(() => item.room._inviteUserCalled, 1000);
	+ verify(item.room._inviteUserPromise);
	+ verify(item.room._inviteUserUserId == '@mew:example.com');
	+ verify(!button.enabled);
	+ const promise = item.room._inviteUserPromise;
	+ promise.resolve(true, {});
	+ tryVerify(() => button.enabled, 1000);
	+ tryVerify(() => item.pageStack._removePageCalled, 1000);
	+ }
	+
	+ function test_roomInvitePageFailed() {
	+ const input = findChild(roomInvitePage, 'inviteUserIdInput');
	+ input.text = '@mew:example.com';
	+
	+ const button = findChild(roomInvitePage, 'inviteUserButton');
	+ mouseClick(button);
	+ tryVerify(() => item.room._inviteUserCalled, 1000);
	+ verify(item.room._inviteUserPromise);
	+ const promise = item.room._inviteUserPromise;
	+ promise.resolve(false, {});
	+ tryVerify(() => button.enabled, 1000);
	+ verify(!item.pageStack._removePageCalled);
	+ }
	+ }
	+}

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