Content Security Policy Headers

// next.config.ts
import type { NextConfig } from 'next';

const cspHeader = `
  default-src 'self';
  script-src 'self' 'unsafe-inline' 'unsafe-eval' https://www.googletagmanager.com https://pagead2.googlesyndication.com;
  style-src 'self' 'unsafe-inline';
  img-src 'self' blob: data: https:;
  font-src 'self' https://fonts.gstatic.com;
  connect-src 'self' https://www.google-analytics.com https://vitals.vercel-insights.com;
  frame-src 'self' https://googleads.g.doubleclick.net;
  object-src 'none';
  base-uri 'self';
  form-action 'self';
  frame-ancestors 'none';
  upgrade-insecure-requests;
`.replace(/\n/g, '');

const nextConfig: NextConfig = {
  async headers() {
    return [
      {
        source: '/(.*)',
        headers: [
          {
            key: 'Content-Security-Policy',
            value: cspHeader,
          },
          {
            key: 'Strict-Transport-Security',
            value: 'max-age=63072000; includeSubDomains; preload',
          },
          {
            key: 'X-Content-Type-Options',
            value: 'nosniff',
          },
          {
            key: 'X-Frame-Options',
            value: 'DENY',
          },
          {
            key: 'X-XSS-Protection',
            value: '1; mode=block',
          },
          {
            key: 'Referrer-Policy',
            value: 'strict-origin-when-cross-origin',
          },
          {
            key: 'Permissions-Policy',
            value: 'camera=(), microphone=(), geolocation=()',
          },
        ],
      },
    ];
  },
};

export default nextConfig;