package security

import "net/http"

// SecureHeaders adds a baseline of security headers.
// CSP is intentionally conservative; adjust if you add external assets.
func SecureHeaders(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", "no-referrer")
		w.Header().Set("Permissions-Policy", "geolocation=(), microphone=(), camera=()")
		w.Header().Set("Cross-Origin-Opener-Policy", "same-origin")
		w.Header().Set("Cross-Origin-Resource-Policy", "same-origin")
		w.Header().Set("Cross-Origin-Embedder-Policy", "require-corp")
		w.Header().Set("Content-Security-Policy",
			"default-src 'self'; "+
				"script-src 'self'; "+
				"style-src 'self'; "+
				"img-src 'self' data:; "+
				"object-src 'none'; "+
				"base-uri 'none'; "+
				"frame-ancestors 'none'; "+
				"form-action 'self'")
		next.ServeHTTP(w, r)
	})
}