55 lines
1.7 KiB
TypeScript
55 lines
1.7 KiB
TypeScript
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import { NextRequest, NextResponse } from 'next/server';
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import { locales, defaultLocale } from './lib/i18n';
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export function middleware(request: NextRequest) {
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// Check if there is any supported locale in the pathname
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const pathname = request.nextUrl.pathname;
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// Check if the pathname already includes a locale
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const pathnameIsMissingLocale = locales.every(
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(locale) => !pathname.startsWith(`/${locale}/`) && pathname !== `/${locale}`,
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);
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// Redirect if there is no locale
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if (pathnameIsMissingLocale) {
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// Try to get locale from Accept-Language header
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const locale = getLocale(request) || defaultLocale;
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return NextResponse.redirect(new URL(`/${locale}${pathname}`, request.url));
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}
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}
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function getLocale(request: NextRequest): string | undefined {
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// Get locale from Accept-Language header
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const acceptLanguage = request.headers.get('accept-language');
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if (!acceptLanguage) return undefined;
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// Parse Accept-Language header
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const languages = acceptLanguage.split(',').map((lang) => lang.split(';')[0].trim());
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// Find matching locale
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for (const lang of languages) {
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if (locales.includes(lang as any)) {
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return lang;
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}
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// Check for language without region (e.g., 'zh' matches 'zh-CN')
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const langWithoutRegion = lang.split('-')[0];
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const matchingLocale = locales.find((locale) => locale.startsWith(langWithoutRegion));
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if (matchingLocale) {
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return matchingLocale;
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}
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}
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return undefined;
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}
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export const config = {
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matcher: [
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// Skip all internal paths (_next)
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'/((?!_next|api|favicon.ico|.*\\..*).*)',
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],
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};
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