From b630267f33f560492475cc322cda9a7398a574ce Mon Sep 17 00:00:00 2001
From: Your Name <your.email@example.com>
Date: Thu, 30 Apr 2026 01:43:41 +0800
Subject: [PATCH] perf: cache scoped site settings

---
 app/api/site-settings/route.ts | 44 ++++++++++++++++++++++++++--------
 1 file changed, 34 insertions(+), 10 deletions(-)

diff --git a/app/api/site-settings/route.ts b/app/api/site-settings/route.ts
index 0b29662aa..bb200ed83 100644
--- a/app/api/site-settings/route.ts
+++ b/app/api/site-settings/route.ts
@@ -463,7 +463,22 @@ const PUBLIC_SITE_SETTINGS_SCOPES = new Set<string>([
   "home",
 ]);
 
-function createScopedSiteSettingsResponse(data: Record<string, unknown>) {
+const SCOPED_SITE_SETTINGS_SERVER_CACHE_TTL_MS = 30_000;
+const scopedSiteSettingsServerCache = new Map<
+  PublicSiteSettingsScope,
+  { data: Record<string, unknown>; expiresAt: number }
+>();
+
+function createScopedSiteSettingsResponse(
+  scope: PublicSiteSettingsScope,
+  data: Record<string, unknown>,
+  cacheStatus: "HIT" | "MISS" = "MISS"
+) {
+  scopedSiteSettingsServerCache.set(scope, {
+    data,
+    expiresAt: Date.now() + SCOPED_SITE_SETTINGS_SERVER_CACHE_TTL_MS,
+  });
+
   const response = NextResponse.json(data);
   // Lightweight public settings change rarely; keep them browser-local briefly
   // so page opens do not repeatedly wait on the large full settings endpoint.
@@ -471,6 +486,8 @@ function createScopedSiteSettingsResponse(data: Record<string, unknown>) {
     "Cache-Control",
     "private, max-age=30, stale-while-revalidate=120"
   );
+  response.headers.set("X-Site-Settings-Scope", scope);
+  response.headers.set("X-Site-Settings-Cache", cacheStatus);
   return response;
 }
 
@@ -509,7 +526,7 @@ async function getScopedPublicSiteSettings(scope: PublicSiteSettingsScope) {
     const { settings, valueByKey } = await readScopedSiteSettings([
       "login_notification",
     ]);
-    return createScopedSiteSettingsResponse({
+    return createScopedSiteSettingsResponse(scope, {
       ...createBrandingSettings(settings as Record<string, unknown> | undefined),
       notification: valueByKey.get("login_notification") || {
         enabled: false,
@@ -523,7 +540,7 @@ async function getScopedPublicSiteSettings(scope: PublicSiteSettingsScope) {
     const { valueByKey } = await readScopedSiteSettings([
       AGENT_WORKFLOW_BRAND_MODEL_CONFIG_KEY,
     ]);
-    return createScopedSiteSettingsResponse({
+    return createScopedSiteSettingsResponse(scope, {
       agentWorkflowBrandModelConfig: normalizeAgentWorkflowBrandModelConfig(
         valueByKey.get(AGENT_WORKFLOW_BRAND_MODEL_CONFIG_KEY)
       ),
@@ -535,7 +552,7 @@ async function getScopedPublicSiteSettings(scope: PublicSiteSettingsScope) {
       AGENT_PRESET_LIBRARY_CONFIG_KEY,
       AGENT_WORKFLOW_SHOWCASE_CONFIG_KEY,
     ]);
-    return createScopedSiteSettingsResponse({
+    return createScopedSiteSettingsResponse(scope, {
       agentPresetLibraryConfig: normalizeAgentPresetLibraryConfig(
         valueByKey.get(AGENT_PRESET_LIBRARY_CONFIG_KEY)
       ),
@@ -571,7 +588,7 @@ async function getScopedPublicSiteSettings(scope: PublicSiteSettingsScope) {
         valueByKey.get(AGENT_PSD_TEMPLATE_CATEGORY_TAG_CONFIG_KEY)
       );
 
-    return createScopedSiteSettingsResponse({
+    return createScopedSiteSettingsResponse(scope, {
       ...createBrandingSettings(typedSettings),
       agentEnabled: typedSettings?.agentEnabled ?? true,
       canvasAgentModeEnabled: normalizeCanvasAgentModeEnabled(
@@ -615,6 +632,7 @@ async function getScopedPublicSiteSettings(scope: PublicSiteSettingsScope) {
   if (scope === "branding") {
     const { settings } = await readScopedSiteSettings([]);
     return createScopedSiteSettingsResponse(
+      scope,
       createBrandingSettings(settings as Record<string, unknown> | undefined)
     );
   }
@@ -622,7 +640,7 @@ async function getScopedPublicSiteSettings(scope: PublicSiteSettingsScope) {
   if (scope === "chat") {
     const { settings } = await readScopedSiteSettings([]);
     const typedSettings = settings as Record<string, unknown> | undefined;
-    return createScopedSiteSettingsResponse({
+    return createScopedSiteSettingsResponse(scope, {
       ...createBrandingSettings(typedSettings),
       showAutoModel: typedSettings?.showAutoModel ?? true,
       usageTimeEnabled: typedSettings?.usageTimeEnabled ?? false,
@@ -648,7 +666,7 @@ async function getScopedPublicSiteSettings(scope: PublicSiteSettingsScope) {
       valueByKey.get(VIDEO_CANVAS_SIDEBAR_ENABLED_KEY)
     );
 
-    return createScopedSiteSettingsResponse({
+    return createScopedSiteSettingsResponse(scope, {
       ...createBrandingSettings(typedSettings),
       agentEnabled: typedSettings?.agentEnabled ?? true,
       canvasAgentModeEnabled: normalizeCanvasAgentModeEnabled(
@@ -685,7 +703,7 @@ async function getScopedPublicSiteSettings(scope: PublicSiteSettingsScope) {
     ]);
     const typedSettings = settings as Record<string, unknown> | undefined;
 
-    return createScopedSiteSettingsResponse({
+    return createScopedSiteSettingsResponse(scope, {
       ...createBrandingSettings(typedSettings),
       bannerEnabled: typedSettings?.bannerEnabled ?? true,
       bannerText:
@@ -726,7 +744,7 @@ async function getScopedPublicSiteSettings(scope: PublicSiteSettingsScope) {
   ]);
   const typedSettings = settings as Record<string, unknown> | undefined;
 
-  return createScopedSiteSettingsResponse({
+  return createScopedSiteSettingsResponse(scope, {
     ...createBrandingSettings(typedSettings),
     canvasDefaultModelId: typedSettings?.canvasDefaultModelId || null,
     lovartComposerPrefix: normalizeLovartComposerPrefix(
@@ -769,7 +787,13 @@ export async function GET(request: NextRequest) {
   try {
     const scope = request.nextUrl.searchParams.get("scope") || "";
     if (PUBLIC_SITE_SETTINGS_SCOPES.has(scope)) {
-      return getScopedPublicSiteSettings(scope as PublicSiteSettingsScope);
+      const scopedScope = scope as PublicSiteSettingsScope;
+      const cached = scopedSiteSettingsServerCache.get(scopedScope);
+      if (cached && cached.expiresAt > Date.now()) {
+        return createScopedSiteSettingsResponse(scopedScope, cached.data, "HIT");
+      }
+
+      return getScopedPublicSiteSettings(scopedScope);
     }
 
     const session = await auth().catch(() => null);