enhance(frontend): コントロールパネルのユーザ検索で入力された情報をページ遷移で損なわないように (#15438)

* enhance(frontend): コントロールパネルのユーザ検索で入力された情報をページ遷移で損なわないように

* sessionStorageよりも更に短命な方法で持つように変更

* add comment

---------

Co-authored-by: syuilo <4439005+syuilo@users.noreply.github.com>

4 files changed, 100 insertions, 7 deletions

diff --git a/CHANGELOG.md b/CHANGELOG.md
index d51369f4bb..940a4309bc 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -13,6 +13,7 @@
 - Enhance: 開発者モードでメニューからファイルIDをコピー出来るように `#15441'
 - Enhance: ノートに埋め込まれたメディアのコンテキストメニューから管理者用のファイル管理画面を開けるように ( #15440 )
 - Enhance: リアクションする際に確認ダイアログを表示できるように
+- Enhance: コントロールパネルのユーザ検索で入力された情報をページ遷移で損なわないように `#15437`
 - Enhance: CWの注釈で入力済みの文字数を表示
 - Fix: ノートページで、クリップ一覧が表示されないことがある問題を修正
 - Fix: コンディショナルロールを手動で割り当てできる導線を削除 `#13529`
diff --git a/packages/frontend/src/account.ts b/packages/frontend/src/account.ts
index 9006150bc8..17d690cd3a 100644
--- a/packages/frontend/src/account.ts
+++ b/packages/frontend/src/account.ts
@@ -7,6 +7,7 @@ import { defineAsyncComponent, reactive, ref } from 'vue';
 import * as Misskey from 'misskey-js';
 import { apiUrl } from '@@/js/config.js';
 import type { MenuItem, MenuButton } from '@/types/menu.js';
+import { defaultMemoryStorage } from '@/memory-storage';
 import { showSuspendedDialog } from '@/scripts/show-suspended-dialog.js';
 import { i18n } from '@/i18n.js';
 import { miLocalStorage } from '@/local-storage.js';
@@ -40,6 +41,8 @@ export function incNotesCount() {
 export async function signout() {
 	if (!$i) return;
 
+	defaultMemoryStorage.clear();
+
 	waiting();
 	document.cookie.split(';').forEach((cookie) => {
 		const cookieName = cookie.split('=')[0].trim();
@@ -107,7 +110,7 @@ export async function removeAccount(idOrToken: Account['id']) {
 }
 
 function fetchAccount(token: string, id?: string, forceShowDialog?: boolean): Promise<Account> {
-	document.cookie = "token=; path=/; max-age=0";
+	document.cookie = 'token=; path=/; max-age=0';
 	document.cookie = `token=${token}; path=/queue; max-age=86400; SameSite=Strict; Secure`; // bull dashboardの認証とかで使う
 
 	return new Promise((done, fail) => {
diff --git a/packages/frontend/src/memory-storage.ts b/packages/frontend/src/memory-storage.ts
new file mode 100644
index 0000000000..df0dc1308f
--- /dev/null
+++ b/packages/frontend/src/memory-storage.ts
@@ -0,0 +1,57 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+export type MemoryStorage = {
+	has: (key: string) => boolean;
+	getItem: <T>(key: string) => T | null;
+	setItem: (key: string, value: unknown) => void;
+	removeItem: (key: string) => void;
+	clear: () => void;
+	size: number;
+};
+
+class MemoryStorageImpl implements MemoryStorage {
+	private readonly storage: Map<string, unknown>;
+
+	constructor() {
+		this.storage = new Map();
+	}
+
+	has(key: string): boolean {
+		return this.storage.has(key);
+	}
+
+	getItem<T>(key: string): T | null {
+		return this.storage.has(key) ? this.storage.get(key) as T : null;
+	}
+
+	setItem(key: string, value: unknown): void {
+		this.storage.set(key, value);
+	}
+
+	removeItem(key: string): void {
+		this.storage.delete(key);
+	}
+
+	clear(): void {
+		this.storage.clear();
+	}
+
+	get size(): number {
+		return this.storage.size;
+	}
+}
+
+export function createMemoryStorage(): MemoryStorage {
+	return new MemoryStorageImpl();
+}
+
+/**
+ * SessionStorageよりも更に短い期間でクリアされるストレージです
+ * - ブラウザの再読み込みやタブの閉じると内容が揮発します
+ * - このストレージは他のタブと共有されません
+ * - アカウント切り替えやログアウトを行うと内容が揮発します
+ */
+export const defaultMemoryStorage: MemoryStorage = createMemoryStorage();
diff --git a/packages/frontend/src/pages/admin/users.vue b/packages/frontend/src/pages/admin/users.vue
index 870c3ce88b..91104b676d 100644
--- a/packages/frontend/src/pages/admin/users.vue
+++ b/packages/frontend/src/pages/admin/users.vue
@@ -10,6 +10,9 @@ SPDX-License-Identifier: AGPL-3.0-only
 		<MkSpacer :contentMax="900">
 			<div class="_gaps">
 				<div :class="$style.inputs">
+					<MkButton style="margin-left: auto" @click="resetQuery">{{ i18n.ts.reset }}</MkButton>
+				</div>
+				<div :class="$style.inputs">
 					<MkSelect v-model="sort" style="flex: 1;">
 						<template #label>{{ i18n.ts.sort }}</template>
 						<option value="-createdAt">{{ i18n.ts.registeredDate }} ({{ i18n.ts.ascendingOrder }})</option>
@@ -57,8 +60,10 @@ SPDX-License-Identifier: AGPL-3.0-only
 </template>
 
 <script lang="ts" setup>
-import { computed, shallowRef, ref } from 'vue';
+import { computed, shallowRef, ref, watchEffect } from 'vue';
 import XHeader from './_header_.vue';
+import { defaultMemoryStorage } from '@/memory-storage';
+import MkButton from '@/components/MkButton.vue';
 import MkInput from '@/components/MkInput.vue';
 import MkSelect from '@/components/MkSelect.vue';
 import MkPagination from '@/components/MkPagination.vue';
@@ -69,13 +74,22 @@ import { definePageMetadata } from '@/scripts/page-metadata.js';
 import MkUserCardMini from '@/components/MkUserCardMini.vue';
 import { dateString } from '@/filters/date.js';
 
+type SearchQuery = {
+	sort?: string;
+	state?: string;
+	origin?: string;
+	username?: string;
+	hostname?: string;
+};
+
 const paginationComponent = shallowRef<InstanceType<typeof MkPagination>>();
+const storedQuery = JSON.parse(defaultMemoryStorage.getItem('admin-users-query') ?? '{}') as SearchQuery;
 
-const sort = ref('+createdAt');
-const state = ref('all');
-const origin = ref('local');
-const searchUsername = ref('');
-const searchHost = ref('');
+const sort = ref(storedQuery.sort ?? '+createdAt');
+const state = ref(storedQuery.state ?? 'all');
+const origin = ref(storedQuery.origin ?? 'local');
+const searchUsername = ref(storedQuery.username ?? '');
+const searchHost = ref(storedQuery.hostname ?? '');
 const pagination = {
 	endpoint: 'admin/show-users' as const,
 	limit: 10,
@@ -119,6 +133,14 @@ function show(user) {
 	os.pageWindow(`/admin/user/${user.id}`);
 }
 
+function resetQuery() {
+	sort.value = '+createdAt';
+	state.value = 'all';
+	origin.value = 'local';
+	searchUsername.value = '';
+	searchHost.value = '';
+}
+
 const headerActions = computed(() => [{
 	icon: 'ti ti-search',
 	text: i18n.ts.search,
@@ -137,6 +159,16 @@ const headerActions = computed(() => [{
 
 const headerTabs = computed(() => []);
 
+watchEffect(() => {
+	defaultMemoryStorage.setItem('admin-users-query', JSON.stringify({
+		sort: sort.value,
+		state: state.value,
+		origin: origin.value,
+		username: searchUsername.value,
+		hostname: searchHost.value,
+	}));
+});
+
 definePageMetadata(() => ({
 	title: i18n.ts.users,
 	icon: 'ti ti-users',