Caddyfile

{
  admin off
  auto_https off
  persist_config off
  log default {
    output stderr
    format console
  }
  grace_period 10s
  shutdown_delay 30s
}

# Main server
:8080 {
  header {
    # https://cheatsheetseries.owasp.org/cheatsheets/HTTP_Headers_Cheat_Sheet.html

    # Remove headers which leak server information
    -Server
    -X-Powered-By

    # Add security headers
    X-Frame-Options "DENY"
    X-Content-Type-Options "nosniff"
    Referrer-Policy "strict-origin-when-cross-origin"
    Strict-Transport-Security "max-age=63072000; includeSubDomains"
    Cross-Origin-Opener-Policy "same-origin"
    Cross-Origin-Resource-Policy "same-site"
    Content-Security-Policy "default-src 'self'; connect-src 'self' {$CADDY_SUPABASE_URL} https://hcaptcha.com https://*.hcaptcha.com https://*.sentry.io; font-src 'self' data:; frame-src 'self' https://hcaptcha.com https://*.hcaptcha.com; img-src 'self' blob: https://*.basemaps.cartocdn.com; media-src 'self' blob:; script-src 'self' 'sha256-MS6/3FCg4WjP9gwgaBGwLpRCY6fZBgwmhVCdrPrNf3E=' 'sha256-tQjf8gvb2ROOMapIxFvFAYBeUJ0v1HCbOcSmDNXGtDo=' 'sha256-VA8O2hAdooB288EpSTrGLl7z3QikbWU9wwoebO/QaYk=' 'sha256-+5XkZFazzJo8n0iOP4ti/cLCMUudTf//Mzkb7xNPXIc=' https://hcaptcha.com https://*.hcaptcha.com; style-src 'self' 'unsafe-inline' https://hcaptcha.com https://*.hcaptcha.com; object-src 'none';"
    Permissions-Policy "accelerometer=(), ambient-light-sensor=(), autoplay=self, battery=(), bluetooth=(), browsing-topics=(), camera=(), display-capture=(), document-domain=(), encrypted-media=(), execution-while-not-rendered=(), execution-while-out-of-viewport=(), fullscreen=(), gamepad=(), geolocation=self, gyroscope=(), hid=(), identity-credentials-get=(), idle-detection=(), local-fonts=(), magnetometer=(), microphone=(), midi=(), otp-credentials=(), payment=(), picture-in-picture=(), publickey-credentials-create=self, publickey-credentials-get=self, screen-wake-lock=(), serial=(), speaker-selection=(), storage-access=(), usb=(), web-shared=(), window-management=(), xr-spatial-tracking=(), interest-cohort=()"
  }

  # Single Page Application (https://caddyserver.com/docs/caddyfile/patterns#single-page-apps-spas)
  handle {
    root * /usr/share/caddy
    encode gzip
    try_files {path} /index.html
    templates /runtime-vars.js {
      mime text/javascript
    }
    file_server
  }
}

# Internal health check
:8081 {
  # See https://caddyserver.com/docs/caddyfile/options#shutdown-delay
  handle {
    @goingDown vars {http.shutting_down} true
    respond @goingDown "Going down in {http.time_until_shutdown}" 503
    respond "OK" 200
  }
}