cinny/docker-nginx.conf

server {
  listen 80;
  listen [::]:80;

  # ── Gitea #95 / #44 — shipped image had no security headers at all.
  # `always` so these are sent on error responses too, not just 200s.
  #
  # Content-Security-Policy, directive by directive:
  #   default-src 'self'          baseline: same-origin unless a directive below opens it up
  #   script-src  'self' 'wasm-unsafe-eval'
  #                                app code is same-origin only; 'wasm-unsafe-eval' is required
  #                                for the wasm modules used for E2EE crypto and audio denoise
  #   style-src   'self' 'unsafe-inline'
  #                                vanilla-extract (the app's CSS-in-JS) emits inline <style>,
  #                                so 'unsafe-inline' is required — no remote stylesheets needed
  #   img-src     * data: blob:   avatars/media/previews come from whichever homeserver or
  #                                media repo the user points the client at — not knowable
  #                                ahead of time — plus data: URIs and blob: for local previews
  #   media-src   * blob:         same reasoning as img-src, for audio/video attachments
  #   connect-src *                the Matrix homeserver is user-chosen at runtime, so this
  #                                can't be pinned to a fixed origin
  #   worker-src  'self' blob:    service worker + blob: web workers (crypto/denoise) are
  #                                same-origin or created from in-memory blobs, never remote
  #   frame-src   ...             the rich link-preview embeds in
  #                                src/app/utils/videoEmbed.ts, one entry per provider:
  #                                YouTube, Vimeo, Dailymotion, Streamable, Twitch, Spotify,
  #                                SoundCloud, Apple Music, Tidal, Mixcloud, Deezer,
  #                                Instagram, Reddit, Bluesky, Loom, Kick, TikTok, Steam —
  #                                plus 'self' (no first-party iframes today, cheap to allow)
  #   object-src  'none'          no <object>/<embed> plugin content is used anywhere
  #   base-uri    'self'          blocks a <base> tag injection from redirecting relative URLs
  #   frame-ancestors 'none'      this app must never be framed by another site (clickjacking)
  #
  # Shipped config — verify against chat.lotusguild.org's live headers before
  # enabling this in the production nginx config; this file is currently only
  # exercised by the CI `docker` smoke-test job, not by the live deploy path.
  add_header Content-Security-Policy "default-src 'self'; script-src 'self' 'wasm-unsafe-eval'; style-src 'self' 'unsafe-inline'; img-src * data: blob:; media-src * blob:; connect-src *; worker-src 'self' blob:; frame-src 'self' https://www.youtube-nocookie.com https://player.vimeo.com https://geo.dailymotion.com https://streamable.com https://clips.twitch.tv https://player.twitch.tv https://open.spotify.com https://w.soundcloud.com https://embed.music.apple.com https://embed.tidal.com https://www.mixcloud.com https://widget.deezer.com https://www.instagram.com https://embed.reddit.com https://embed.bsky.app https://www.loom.com https://player.kick.com https://www.tiktok.com https://store.steampowered.com; object-src 'none'; base-uri 'self'; frame-ancestors 'none'" always;
  add_header Referrer-Policy "no-referrer" always;
  add_header X-Content-Type-Options "nosniff" always;

  location / {
    root /usr/share/nginx/html;

    rewrite ^/config.json$ /config.json break;
    rewrite ^/manifest.json$ /manifest.json break;

    rewrite ^/sw.js$ /sw.js break;
    rewrite ^/pdf.worker.min.js$ /pdf.worker.min.js break;

    rewrite ^/public/(.*)$ /public/$1 break;
    rewrite ^/assets/(.*)$ /assets/$1 break;

    rewrite ^(.+)$ /index.html break;
  }
}