Edge Runtime

// Next.js Edge Middleware 예제
// middleware.ts
import { NextResponse } from 'next/server';
import type { NextRequest } from 'next/server';

export const config = {
  matcher: ['/api/:path*', '/dashboard/:path*'],
};

export function middleware(request: NextRequest) {
  // 1. 지역 기반 라우팅
  const country = request.geo?.country || 'US';

  if (request.nextUrl.pathname === '/') {
    return NextResponse.redirect(
      new URL(`/${country.toLowerCase()}`, request.url)
    );
  }

  // 2. 인증 토큰 검증 (엣지에서 즉시 처리)
  const token = request.cookies.get('auth-token');

  if (request.nextUrl.pathname.startsWith('/dashboard')) {
    if (!token) {
      return NextResponse.redirect(new URL('/login', request.url));
    }

    // 토큰 유효성 간단 검증 (무거운 검증은 API에서)
    try {
      const payload = JSON.parse(atob(token.value.split('.')[1]));
      if (payload.exp < Date.now() / 1000) {
        return NextResponse.redirect(new URL('/login', request.url));
      }
    } catch {
      return NextResponse.redirect(new URL('/login', request.url));
    }
  }

  // 3. A/B 테스트 쿠키 설정
  const response = NextResponse.next();
  if (!request.cookies.has('ab-variant')) {
    response.cookies.set('ab-variant', Math.random() > 0.5 ? 'A' : 'B');
  }

  return response;
}