README

Fixes Hyvä CSP state leaking across requests when running Magento 2 under FrankenPHP worker mode.

The problem

Hyvä's HyvaCsp ViewModel caches two values after its first call per request — the collected CSP fetch policies ($memoizedPolicies) and the current area code ($memoizedAreaCode). Under normal PHP-FPM, this is fine: the process resets on every request. Under FrankenPHP worker mode, the process is long-lived and HyvaCsp is a shared singleton, so those cached values persist into the next request.

This causes a subtle but severe bug: if any request runs under a strict CSP (e.g. the checkout page, which doesn't allow unsafe-eval), $memoizedPolicies is set without unsafe-eval. Every subsequent request then sees isEvalAllowed() = false and loads alpine3-csp.min.js (the CSP Alpine build) instead of the standard Alpine. The CSP Alpine build cannot evaluate string expressions, so every Alpine component on every page throws an error until the worker process is recycled.

The stale $memoizedAreaCode causes a second issue: isAreaCodeSet() short-circuits to the wrong area, suppressing nonce/hash handling on pages running under a different area.

The fix

This module subclasses HyvaCsp and implements ResetAfterRequestInterface. The _resetState() method nullifies both private parent properties via reflection at the end of each request, so the next request starts with a clean slate.

Requirements

Installation

composer require reessolutions/module-worker-mode-hyva
bin/magento module:enable Reessolutions_WorkerModeHyva
bin/magento setup:upgrade

How it works

etc/di.xml registers a preference that replaces Hyva\Theme\ViewModel\HyvaCsp with Reessolutions\WorkerModeHyva\ViewModel\HyvaCsp. The subclass adds only one method:

public function _resetState(): void
{
    // nullifies $memoizedPolicies and $memoizedAreaCode on the parent via reflection
}

Magento's object manager calls _resetState() on every class that implements ResetAfterRequestInterface at the end of each worker-mode request.

License

OSL-3.0 — see LICENSE.