middleware.ts

import createMiddleware from "next-intl/middleware";
import { routing } from "./i18n/routing";
import { NextRequest, NextResponse } from "next/server";

// 创建国际化中间件
const handleI18nRouting = createMiddleware(routing);

export default function middleware(request: NextRequest) {
  // 首先处理国际化路由
  const response = handleI18nRouting(request);
  
  // 添加SEO和性能优化头部
  response.headers.set('X-DNS-Prefetch-Control', 'on');
  response.headers.set('X-Content-Type-Options', 'nosniff');
  response.headers.set('Referrer-Policy', 'origin-when-cross-origin');
  response.headers.set('X-Frame-Options', 'DENY');
  
  // 性能优化缓存策略
  const { pathname } = request.nextUrl;
  
  if (pathname.startsWith('/imgs/') || pathname.startsWith('/icons/') || pathname.endsWith('.svg') || pathname.endsWith('.png') || pathname.endsWith('.jpg')) {
    response.headers.set('Cache-Control', 'public, max-age=31536000, immutable');
  } else if (pathname === '/' || pathname.startsWith('/create') || pathname.startsWith('/video/')) {
    // 对主要页面设置适当的缓存
    response.headers.set('Cache-Control', 'public, s-maxage=3600, stale-while-revalidate=86400');
  }
  
  return response;
}

export const config = {
  matcher: [
    "/",
    "/(en|en-US|zh|zh-CN|zh-TW|zh-HK|zh-MO|ja|ko|ru|fr|de|ar|es|it)/:path*",
    "/((?!privacy-policy|terms-of-service|api/|_next|_vercel|.*\\..*).*)",
  ],
};