perf(frontend): reduce api requests for non-logged-in enviroment (#15001)

* wip

* Update CHANGELOG.md

* wip

4 files changed, 60 insertions, 6 deletions

diff --git a/packages/frontend/src/pages/clip.vue b/packages/frontend/src/pages/clip.vue
index 7b1737fece..891d59d605 100644
--- a/packages/frontend/src/pages/clip.vue
+++ b/packages/frontend/src/pages/clip.vue
@@ -33,25 +33,28 @@ SPDX-License-Identifier: AGPL-3.0-only
 <script lang="ts" setup>
 import { computed, watch, provide, ref } from 'vue';
 import * as Misskey from 'misskey-js';
+import { url } from '@@/js/config.js';
+import type { MenuItem } from '@/types/menu.js';
 import MkNotes from '@/components/MkNotes.vue';
 import { $i } from '@/account.js';
 import { i18n } from '@/i18n.js';
 import * as os from '@/os.js';
 import { misskeyApi } from '@/scripts/misskey-api.js';
 import { definePageMetadata } from '@/scripts/page-metadata.js';
-import { url } from '@@/js/config.js';
 import MkButton from '@/components/MkButton.vue';
 import { clipsCache } from '@/cache.js';
 import { isSupportShare } from '@/scripts/navigator.js';
 import { copyToClipboard } from '@/scripts/copy-to-clipboard.js';
 import { genEmbedCode } from '@/scripts/get-embed-code.js';
-import type { MenuItem } from '@/types/menu.js';
+import { getServerContext } from '@/server-context.js';
+
+const CTX_CLIP = getServerContext('clip');
 
 const props = defineProps<{
 	clipId: string,
 }>();
 
-const clip = ref<Misskey.entities.Clip | null>(null);
+const clip = ref<Misskey.entities.Clip | null>(CTX_CLIP);
 const favorited = ref(false);
 const pagination = {
 	endpoint: 'clips/notes' as const,
@@ -64,6 +67,11 @@ const pagination = {
 const isOwned = computed<boolean | null>(() => $i && clip.value && ($i.id === clip.value.userId));
 
 watch(() => props.clipId, async () => {
+	if (CTX_CLIP && CTX_CLIP.id === props.clipId) {
+		clip.value = CTX_CLIP;
+		return;
+	}
+
 	clip.value = await misskeyApi('clips/show', {
 		clipId: props.clipId,
 	});
diff --git a/packages/frontend/src/pages/note.vue b/packages/frontend/src/pages/note.vue
index 454ee3c6bc..3e1d04bd6d 100644
--- a/packages/frontend/src/pages/note.vue
+++ b/packages/frontend/src/pages/note.vue
@@ -62,13 +62,16 @@ import { dateString } from '@/filters/date.js';
 import MkClipPreview from '@/components/MkClipPreview.vue';
 import { defaultStore } from '@/store.js';
 import { pleaseLogin } from '@/scripts/please-login.js';
+import { getServerContext } from '@/server-context.js';
+
+const CTX_NOTE = getServerContext('note');
 
 const props = defineProps<{
 	noteId: string;
 	initialTab?: string;
 }>();
 
-const note = ref<null | Misskey.entities.Note>();
+const note = ref<null | Misskey.entities.Note>(CTX_NOTE);
 const clips = ref<Misskey.entities.Clip[]>();
 const showPrev = ref<'user' | 'channel' | false>(false);
 const showNext = ref<'user' | 'channel' | false>(false);
@@ -116,6 +119,12 @@ function fetchNote() {
 	showPrev.value = false;
 	showNext.value = false;
 	note.value = null;
+
+	if (CTX_NOTE && CTX_NOTE.id === props.noteId) {
+		note.value = CTX_NOTE;
+		return;
+	}
+
 	misskeyApi('notes/show', {
 		noteId: props.noteId,
 	}).then(res => {
diff --git a/packages/frontend/src/pages/user/index.vue b/packages/frontend/src/pages/user/index.vue
index a6244e2a93..d862387401 100644
--- a/packages/frontend/src/pages/user/index.vue
+++ b/packages/frontend/src/pages/user/index.vue
@@ -39,6 +39,7 @@ import { definePageMetadata } from '@/scripts/page-metadata.js';
 import { i18n } from '@/i18n.js';
 import { $i } from '@/account.js';
 import MkHorizontalSwipe from '@/components/MkHorizontalSwipe.vue';
+import { getServerContext } from '@/server-context.js';
 
 const XHome = defineAsyncComponent(() => import('./home.vue'));
 const XTimeline = defineAsyncComponent(() => import('./index.timeline.vue'));
@@ -52,6 +53,8 @@ const XFlashs = defineAsyncComponent(() => import('./flashs.vue'));
 const XGallery = defineAsyncComponent(() => import('./gallery.vue'));
 const XRaw = defineAsyncComponent(() => import('./raw.vue'));
 
+const CTX_USER = getServerContext('user');
+
 const props = withDefaults(defineProps<{
 	acct: string;
 	page?: string;
@@ -61,13 +64,24 @@ const props = withDefaults(defineProps<{
 
 const tab = ref(props.page);
 
-const user = ref<null | Misskey.entities.UserDetailed>(null);
+const user = ref<null | Misskey.entities.UserDetailed>(CTX_USER);
 const error = ref<any>(null);
 
 function fetchUser(): void {
 	if (props.acct == null) return;
+
+	const { username, host } = Misskey.acct.parse(props.acct);
+
+	if (CTX_USER && CTX_USER.username === username && CTX_USER.host === host) {
+		user.value = CTX_USER;
+		return;
+	}
+
 	user.value = null;
-	misskeyApi('users/show', Misskey.acct.parse(props.acct)).then(u => {
+	misskeyApi('users/show', {
+		username,
+		host,
+	}).then(u => {
 		user.value = u;
 	}).catch(err => {
 		error.value = err;
diff --git a/packages/frontend/src/server-context.ts b/packages/frontend/src/server-context.ts
new file mode 100644
index 0000000000..aa44a10290
--- /dev/null
+++ b/packages/frontend/src/server-context.ts
@@ -0,0 +1,23 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+import * as Misskey from 'misskey-js';
+import { $i } from '@/account.js';
+
+const providedContextEl = document.getElementById('misskey_clientCtx');
+
+export type ServerContext = {
+	clip?: Misskey.entities.Clip;
+	note?: Misskey.entities.Note;
+	user?: Misskey.entities.UserLite;
+} | null;
+
+export const serverContext: ServerContext = (providedContextEl && providedContextEl.textContent) ? JSON.parse(providedContextEl.textContent) : null;
+
+export function getServerContext<K extends keyof NonNullable<ServerContext>>(entity: K): Required<Pick<NonNullable<ServerContext>, K>> | null {
+	// contextは非ログイン状態の情報しかないためログイン時は利用できない
+	if ($i) return null;
+
+	return serverContext ? (serverContext[entity] ?? null) : null;
+}