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Security headers bounty #109

Request

Implement the open $35 security-headers bounty for Lilly-Protocol/lily-frontend, validate the change, and prepare a pull request while keeping GitHub and payment information private.

Scope and decision

  • Target: Lilly-Protocol/lily-frontend#109.
  • Scope was limited to the issue's requested response headers and documentation.
  • The CSP allows the current Next.js shell's inline scripts/styles, keeps production free of unsafe-eval, and permits only same-origin resources plus data:/blob: assets needed by the current app.
  • No third-party hosts, payment details, credentials, or private messages were added to the repository.

Changes

  • Added a headers() rule in next.config.ts for /:path*.
  • Added Content-Security-Policy, Referrer-Policy, X-Content-Type-Options, and X-Frame-Options.
  • Added a unit test covering the route matcher and required directives.
  • Documented the policy and future third-party integration considerations in README.md.

Verification

  • npm ci completed on Node v24.14.0 / npm 11.9.0.
  • npm run lint passed.
  • npm run typecheck passed.
  • npm run test:run passed: 6 files, 10 tests; coverage 96.29% statements, 90% branches, 100% functions, 96% lines.
  • npm run build passed with Next.js 16.2.6; 28 routes generated.
  • npm run check passed.
  • Production server response checks passed for /, /signin, /app, /security, and /robots.txt; all four required headers and the CSP were present.
  • git diff --check passed.

Open risks and follow-up

  • npm ci reported 9 dependency audit findings (1 low, 8 high) from the existing dependency graph; these were not changed because they are outside issue #109.
  • If a future feature adds analytics, APIs, remote fonts, embeds, or external images, the CSP must be reviewed and narrowed to the exact required hosts.
  • GitHub maintainer review, merge, bounty approval, and payment are external gates and remain pending.
  • The PR's Vercel status is currently failing at an authorization URL owned by the repository's deployment integration; this is an external deployment gate and does not contradict the passing local production build or header checks.

Useful paths and commands

  • Branch: security-headers-109
  • Config: next.config.ts
  • Test: src/config/security-headers.test.ts
  • Docs: README.md
  • Quality record: .planning/security-headers-109/quality-gates.json
  • Verify locally: npm run check