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feat: save locale in cookies

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This commit is contained in:
Henry Li
2026-01-20 16:00:39 +08:00
parent 32a45eb043
commit faba2784e1
7 changed files with 131 additions and 38 deletions
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8
frontend/src/app/layout.tsx
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@@ -4,6 +4,8 @@ import { type Metadata } from "next";
import { Geist } from "next/font/google"; import { Geist } from "next/font/google";
import { ThemeProvider } from "@/components/theme-provider"; import { ThemeProvider } from "@/components/theme-provider";
import { I18nProvider } from "@/core/i18n/context";
import { detectLocaleServer } from "@/core/i18n/server";
export const metadata: Metadata = { export const metadata: Metadata = {
title: "Welcome to DeerFlow", title: "Welcome to DeerFlow",
@@ -16,11 +18,13 @@ const geist = Geist({
variable: "--font-geist-sans", variable: "--font-geist-sans",
}); });
export default function RootLayout({ export default async function RootLayout({
children, children,
}: Readonly<{ children: React.ReactNode }>) { }: Readonly<{ children: React.ReactNode }>) {
const locale = await detectLocaleServer();
return ( return (
<html <html
lang={locale}
className={geist.variable} className={geist.variable}
suppressContentEditableWarning suppressContentEditableWarning
suppressHydrationWarning suppressHydrationWarning
@@ -32,7 +36,7 @@ export default function RootLayout({
enableSystem enableSystem
disableTransitionOnChange disableTransitionOnChange
> >
{children} <I18nProvider initialLocale={locale}>{children}</I18nProvider>
</ThemeProvider> </ThemeProvider>
</body> </body>
</html> </html>

2
frontend/src/components/workspace/workspace-sidebar.tsx
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@@ -1,3 +1,5 @@
"use client";
import { SettingsIcon } from "lucide-react"; import { SettingsIcon } from "lucide-react";
import { import {

41
frontend/src/core/i18n/context.tsx Normal file
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@@ -0,0 +1,41 @@
"use client";
import { createContext, useContext, useState, type ReactNode } from "react";
import type { Locale } from "@/core/i18n";
export interface I18nContextType {
locale: Locale;
setLocale: (locale: Locale) => void;
}
export const I18nContext = createContext<I18nContextType | null>(null);
export function I18nProvider({
children,
initialLocale,
}: {
children: ReactNode;
initialLocale: Locale;
}) {
const [locale, setLocale] = useState<Locale>(initialLocale);
const handleSetLocale = (newLocale: Locale) => {
setLocale(newLocale);
document.cookie = `locale=${newLocale}; path=/; max-age=31536000`;
};
return (
<I18nContext.Provider value={{ locale, setLocale: handleSetLocale }}>
{children}
</I18nContext.Provider>
);
}
export function useI18nContext() {
const context = useContext(I18nContext);
if (!context) {
throw new Error("useI18n must be used within I18nProvider");
}
return context;
}

52
frontend/src/core/i18n/cookies.ts Normal file
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@@ -0,0 +1,52 @@
/**
* Cookie utilities for locale management
* Works on both client and server side
*/
const LOCALE_COOKIE_NAME = "locale";
/**
* Get locale from cookie (client-side)
*/
export function getLocaleFromCookie(): string | null {
if (typeof document === "undefined") {
return null;
}
const cookies = document.cookie.split(";");
for (const cookie of cookies) {
const [name, value] = cookie.trim().split("=");
if (name === LOCALE_COOKIE_NAME) {
return decodeURIComponent(value ?? "");
}
}
return null;
}
/**
* Set locale in cookie (client-side)
*/
export function setLocaleInCookie(locale: string): void {
if (typeof document === "undefined") {
return;
}
// Set cookie with 1 year expiration
const maxAge = 365 * 24 * 60 * 60; // 1 year in seconds
document.cookie = `${LOCALE_COOKIE_NAME}=${encodeURIComponent(locale)}; max-age=${maxAge}; path=/; SameSite=Lax`;
}
/**
* Get locale from cookie (server-side)
* Use this in server components or API routes
*/
export async function getLocaleFromCookieServer(): Promise<string | null> {
try {
const { cookies } = await import("next/headers");
const cookieStore = await cookies();
return cookieStore.get(LOCALE_COOKIE_NAME)?.value ?? null;
} catch {
// Fallback if cookies() is not available (e.g., in middleware)
return null;
}
}

31
frontend/src/core/i18n/hooks.ts
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@@ -1,7 +1,9 @@
"use client"; "use client";
import { useEffect, useState } from "react"; import { useEffect } from "react";
import { useI18nContext } from "./context";
import { getLocaleFromCookie, setLocaleInCookie } from "./cookies";
import { enUS } from "./locales/en-US"; import { enUS } from "./locales/en-US";
import { zhCN } from "./locales/zh-CN"; import { zhCN } from "./locales/zh-CN";
@@ -13,41 +15,24 @@ const translations: Record<Locale, Translations> = {
}; };
export function useI18n() { export function useI18n() {
const [locale, setLocale] = useState<Locale>(() => { const { locale, setLocale } = useI18nContext();
if (typeof window === "undefined") {
return "en-US";
}
// Try to get from localStorage first
const saved = localStorage.getItem("locale") as Locale | null;
if (saved && (saved === "en-US" || saved === "zh-CN")) {
return saved;
}
// Otherwise detect from browser
return detectLocale();
});
const t = translations[locale]; const t = translations[locale];
const changeLocale = (newLocale: Locale) => { const changeLocale = (newLocale: Locale) => {
setLocale(newLocale); setLocale(newLocale);
if (typeof window !== "undefined") { setLocaleInCookie(newLocale);
localStorage.setItem("locale", newLocale);
}
}; };
// Initialize locale on mount // Initialize locale on mount
useEffect(() => { useEffect(() => {
if (typeof window !== "undefined") { const saved = getLocaleFromCookie() as Locale | null;
const saved = localStorage.getItem("locale") as Locale | null;
if (!saved) { if (!saved) {
const detected = detectLocale(); const detected = detectLocale();
setLocale(detected); setLocale(detected);
localStorage.setItem("locale", detected); setLocaleInCookie(detected);
} }
} }, [setLocale]);
}, []);
return { return {
locale, locale,

20
frontend/src/core/i18n/index.ts
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@@ -6,18 +6,18 @@ export type Locale = "en-US" | "zh-CN";
// Helper function to detect browser locale // Helper function to detect browser locale
export function detectLocale(): Locale { export function detectLocale(): Locale {
// if (typeof window === "undefined") { if (typeof window === "undefined") {
// return "en-US"; return "en-US";
// } }
// const browserLang = const browserLang =
// navigator.language || navigator.language ||
// (navigator as unknown as { userLanguage: string }).userLanguage; (navigator as unknown as { userLanguage: string }).userLanguage;
// // Check if browser language is Chinese (zh, zh-CN, zh-TW, etc.) // Check if browser language is Chinese (zh, zh-CN, zh-TW, etc.)
// if (browserLang.toLowerCase().startsWith("zh")) { if (browserLang.toLowerCase().startsWith("zh")) {
// return "zh-CN"; return "zh-CN";
// } }
return "en-US"; return "en-US";
} }

9
frontend/src/core/i18n/server.ts Normal file
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@@ -0,0 +1,9 @@
import { cookies } from "next/headers";
export type Locale = "en-US" | "zh-CN";
export async function detectLocaleServer(): Promise<Locale> {
const cookieStore = await cookies();
const locale = cookieStore.get("locale")?.value ?? "en-US";
return locale as Locale;
}