next.config.js

const { get } = require('@vercel/edge-config');
const { withContentlayer } = require('next-contentlayer');

/** @type {import('next').NextConfig} */
const nextConfig = {
  experimental: {
    serverActions: true,
  },
  redirects() {
    try {
      return get('redirects');
    } catch {
      return [];
    }
  },
  headers() {
    return [
      {
        source: '/(.*)',
        headers: securityHeaders,
      },
    ];
  },
};

// https://nextjs.org/docs/advanced-features/security-headers
const ContentSecurityPolicy = `
    default-src 'self' vercel.live;
    script-src 'self' 'unsafe-eval' 'unsafe-inline' cdn.vercel-insights.com vercel.live;
    style-src 'self' 'unsafe-inline';
    frame-src 'self' https://www.youtube.com https://player.vimeo.com data:;
    img-src * blob: data:;
    media-src 'none';
    connect-src *;
    font-src 'self' data:;
`;

const securityHeaders = [
  // https://developer.mozilla.org/en-US/docs/Web/HTTP/CSP
  {
    key: 'Content-Security-Policy',
    value: ContentSecurityPolicy.replace(/\n/g, ''),
  },
  // https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Referrer-Policy
  {
    key: 'Referrer-Policy',
    value: 'origin-when-cross-origin',
  },
  // https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-Frame-Options
  // {
  //   key: 'X-Frame-Options',
  //   value: 'DENY',
  // },
  // https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-Content-Type-Options
  {
    key: 'X-Content-Type-Options',
    value: 'nosniff',
  },
  // https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-DNS-Prefetch-Control
  {
    key: 'X-DNS-Prefetch-Control',
    value: 'on',
  },
  // https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Strict-Transport-Security
  {
    key: 'Strict-Transport-Security',
    value: 'max-age=31536000; includeSubDomains; preload',
  },
  // https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Feature-Policy
  {
    key: 'Permissions-Policy',
    value: 'camera=(), microphone=(), geolocation=()',
  },
];

module.exports = withContentlayer(nextConfig);