ai_gallery/src/middleware.js

// middleware.js
import { NextResponse } from 'next/server';

const LOCALES = ['en', 'zh'];

function getPreferredLocale(request) {
  // 检查 cookie
  const localeCookie = request.cookies.get('NEXT_LOCALE')?.value;
  if (localeCookie && LOCALES.includes(localeCookie)) {
    return localeCookie;
  }

  // 检查 Accept-Language 头
  const acceptLanguage = request.headers.get('Accept-Language');
  if (acceptLanguage) {
    const preferredLocale = acceptLanguage.split(',')[0].split('-')[0];
    if (LOCALES.includes(preferredLocale)) {
      return preferredLocale;
    }
  }

  // 默认语言
  return 'en';
}

export function middleware(request) {
  const pathname = request.nextUrl.pathname;

  // 首先检查是否为静态文件
  if (
    pathname.endsWith('.xml') ||
    pathname.endsWith('.js') ||
    pathname.endsWith('.json') ||
    pathname.endsWith('.csv') ||
    pathname.endsWith('.xlsx') ||
    pathname.endsWith('.docx') ||
    pathname.endsWith('.txt') ||
    pathname.endsWith('.ico')
  ) {
    // 对于静态文件，直接返回，不做任何处理
    return NextResponse.next();
  }

  let response;
  // 处理根路径
  if (pathname === '/') {
    const preferredLocale = getPreferredLocale(request);
    response = NextResponse.redirect(new URL(`/${preferredLocale}/games`, request.url));
  } else {
    // 处理缺少语言前缀的路径
    const pathnameIsMissingLocale = LOCALES.every(
      (locale) => !pathname.startsWith(`/${locale}/`) && pathname !== `/${locale}`
    );
    if (pathnameIsMissingLocale) {
      const preferredLocale = getPreferredLocale(request);
      response = NextResponse.redirect(new URL(`/${preferredLocale}${pathname}/`, request.url));
    } else {
      response = NextResponse.next();
    }
  }

  // 添加自定义 header
  if (response) {
    response.headers.set('x-pathname', pathname);
  } else {
    response = NextResponse.next();
    response.headers.set('x-pathname', pathname);
  }

  response.headers.set('X-Robots-Tag', 'index,follow');
  return response;
}

export const config = {
  matcher: [
    /*
     * Match all request paths except for the ones starting with:
     * - api (API routes)
     * - _next/static (static files)
     * - _next/image (image optimization files)
     */
    '/((?!api|_next/static|_next/image|robots.txt).*)',
  ],
};