EzPublish Legacy Configuration Mapper

EzPublishLegacyConfigurationMapper.php

<?php
namespace EzPublish\AppBundle\EventListener;

use eZ\Publish\Core\MVC\Legacy\Event\PreBuildKernelEvent;
use eZ\Publish\Core\MVC\Legacy\LegacyEvents;
use Symfony\Component\EventDispatcher\EventSubscriberInterface;

class LegacyConfigurationMapper implements EventSubscriberInterface
{
    /**
     * Settings to inject into the legacy stack.
     *
     * @var array
     */
    protected $settings;

    /**
     * {@inheritdoc}
     *
     * @return array
     */
    public static function getSubscribedEvents()
    {
        return [
            LegacyEvents::PRE_BUILD_LEGACY_KERNEL => ["onBuildKernel", 128]
        ];
    }

    /**
     * Maps a setting to legacy stack configuration settings.
     *
     * @param string $namespace A full namespace (e.g. `site.ini/RegionalSettings/Locale`)
     * @param string $value Setting
     *
     * @return void
     */
    public function addSetting($namespace, $value)
    {
        $this->settings[$namespace] = $value;
    }

    /**
     * {@inheritdoc}
     *
     * @param  PreBuildKernelEvent $e
     *
     * @return void
     */
    public function onBuildKernel(PreBuildKernelEvent $e)
    {
        $e->getParameters()->set(
            "injected-settings",
            $this->settings+(array)$e->getParameters()->get("injected-settings")
        );
    }
}

services.yml

services:

    # Event Listeners
    ezpublish.event_listeners.legacy_configuration_mapper:
        class: EzPublish\AppBundle\EventListener\LegacyConfigurationMapper
        tags: [{ name: kernel.event_subscriber }]
        calls:
            - [addSetting, ["ezjscore.ini/Packer/CustomHosts", { 0: null, ".js": @=service('request_stack').getMasterRequest().getSchemeAndHttpHost() ~ "/" } ]]
            - [addSetting, ["acmecorp.ini/Settings/ContentRemoteId", %content.remote_id%]]