next.config.ts

import type { NextConfig } from "next";

const nextConfig: NextConfig = {
  /* config options here */
  reactStrictMode: true,
  transpilePackages: ["next-auth", "lowlight"],
  async headers() {
    return [
      {
        source: "/",
        headers: securityHeaders,
      },
      {
        source: "/:path*",
        headers: securityHeaders,
      },
      {
        source: "/api/:path*",
        headers: [
          {
            key: "Cache-Control",
            value: "private, no-store",
          },
        ],
      },
    ];
  },
};

// https://securityheaders.com
const ContentSecurityPolicy = `
  default-src 'self';
  script-src 'self' 'unsafe-eval' 'unsafe-inline' *.youtube.com *.twitter.com va.vercel-scripts.com;
  child-src *.youtube.com *.google.com *.twitter.com *.loom.com *.figma.com;
  frame-src *.youtube.com *.twitter.com *.loom.com *.figma.com *.vimeo.com;
  style-src 'self' 'unsafe-inline' *.googleapis.com;
  img-src * blob: data: t3.gstatic.com;
  media-src 'self' *.youtube.com *.gstatic.com;
  connect-src *;
  font-src 'self' *.googleapis.com *.gstatic.com unpkg.com;
`;

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=()",
  },
];

export default nextConfig;