middleware.ts

import { NextResponse } from 'next/server'
import type { NextRequest } from 'next/server'

export function middleware(request: NextRequest) {
  const response = NextResponse.next()

  // Security Headers
  
  // Prevent clickjacking
  response.headers.set('X-Frame-Options', 'DENY')
  
  // Prevent MIME sniffing
  response.headers.set('X-Content-Type-Options', 'nosniff')
  
  // XSS Protection
  response.headers.set('X-XSS-Protection', '1; mode=block')
  
  // Referrer Policy
  response.headers.set('Referrer-Policy', 'strict-origin-when-cross-origin')
  
  // HSTS (force HTTPS)
  response.headers.set(
    'Strict-Transport-Security',
    'max-age=31536000; includeSubDomains; preload'
  )
  
  // Permissions Policy
  response.headers.set(
    'Permissions-Policy',
    'camera=(), microphone=(), geolocation=()'
  )
  
  // Content Security Policy
  response.headers.set(
    'Content-Security-Policy',
    [
      "default-src 'self'",
      "script-src 'self' 'unsafe-inline' 'unsafe-eval' https://js.stripe.com",
      "style-src 'self' 'unsafe-inline'",
      "img-src 'self' data: https: blob:",
      "connect-src 'self' https://api.stripe.com https://*.supabase.co",
      "font-src 'self' data:",
      "frame-src 'self' https://js.stripe.com https://hooks.stripe.com",
      "object-src 'none'",
      "base-uri 'self'",
      "form-action 'self'",
      "frame-ancestors 'none'",
    ].join('; ')
  )
  
  return response
}

// Apply middleware to all routes
export const config = {
  matcher: [
    /*
     * Match all request paths except:
     * - _next/static (static files)
     * - _next/image (image optimization files)
     * - favicon.ico (favicon file)
     * - public folder
     */
    '/((?!_next/static|_next/image|favicon.ico|.*\\.(?:svg|png|jpg|jpeg|gif|webp)$).*)',
  ],
}