package middleware

import "net/http"

// SecurityHeaders returns middleware that sets common security headers on
// every response. HSTS is intentionally omitted here because Caddy handles
// it at the reverse-proxy layer.
func SecurityHeaders(next http.Handler) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.Header().Set("X-Content-Type-Options", "nosniff")
		w.Header().Set("X-Frame-Options", "DENY")
		w.Header().Set("Referrer-Policy", "strict-origin-when-cross-origin")
		w.Header().Set("Content-Security-Policy",
			"default-src 'self'; script-src 'self'; style-src 'self' 'unsafe-inline'; "+
				"img-src 'self' https: data:; connect-src 'self' wss: ws:; font-src 'self';")
		w.Header().Set("Permissions-Policy", "camera=(), microphone=(self), geolocation=()")
		next.ServeHTTP(w, r)
	})
}
