next.config.ts

import type { NextConfig } from "next";

const supabaseUrl = process.env.NEXT_PUBLIC_SUPABASE_URL;
const isProduction = process.env.NODE_ENV === "production";

const csp = [
  "default-src 'self'",
  "base-uri 'self'",
  "object-src 'none'",
  "frame-ancestors 'none'",
  "form-action 'self'",
  "img-src 'self' data: blob:",
  "font-src 'self' data:",
  "style-src 'self' 'unsafe-inline'",
  "script-src 'self' 'unsafe-inline' 'unsafe-eval'",
  `connect-src 'self' https://*.supabase.co wss://*.supabase.co${supabaseUrl ? ` ${supabaseUrl}` : ""}`,
  isProduction ? "upgrade-insecure-requests" : "",
]
  .filter(Boolean)
  .join("; ");

const securityHeaders = [
  {
    key: "Content-Security-Policy",
    value: csp,
  },
  {
    key: "X-Content-Type-Options",
    value: "nosniff",
  },
  {
    key: "Referrer-Policy",
    value: "strict-origin-when-cross-origin",
  },
  {
    key: "X-Frame-Options",
    value: "DENY",
  },
  {
    key: "Permissions-Policy",
    value: "camera=(), microphone=(), geolocation=(), payment=()",
  },
  ...(isProduction
    ? [
        {
          key: "Strict-Transport-Security",
          value: "max-age=63072000; includeSubDomains; preload",
        },
      ]
    : []),
];

const nextConfig: NextConfig = {
  async headers() {
    return [
      {
        source: "/:path*",
        headers: securityHeaders,
      },
    ];
  },
};

export default nextConfig;