Setting document sitehash based on the requested site

ModifyDocumentSiteHash.php

<?php

namespace Vendor\Solr\EventListener;

use ApacheSolrForTypo3\Solr\Event\Indexing\BeforeDocumentsAreIndexedEvent;

final class ModifyDocumentSiteHash
{
    public function __invoke(BeforeDocumentsAreIndexedEvent $event): void
    {
        $documents = [];

        foreach ($event->getDocuments() as $document) {
            $originalSiteHash = $document->siteHash;
            $originalId = $document->id;
            $siteIdentifier = $event->getSite()->getIdentifier();
            $newSiteHash = sha1($siteIdentifier . $GLOBALS['TYPO3_CONF_VARS']['SYS']['encryptionKey'] . 'tx_solr');
            $document->setField('id', str_replace($originalSiteHash, $newSiteHash, $originalId));
            $document->setField('site', $siteIdentifier);
            $document->setField('siteHash', $newSiteHash);

            $documents[] = $document;
        }

        $event->setDocuments($documents);
    }
}

ModifySearchQuerySiteHash.php

<?php

namespace Vendor\Solr\EventListener;

use ApacheSolrForTypo3\Solr\Event\Search\AfterSearchQueryHasBeenPreparedEvent;
use TYPO3\CMS\Core\Http\ServerRequest;

final class ModifySearchQuerySiteHash
{
    public function __invoke(AfterSearchQueryHasBeenPreparedEvent $event): void
    {
        /** @var ServerRequest $request */
        $request = $GLOBALS['TYPO3_REQUEST'];
        $site = $request->getAttribute('site');
        $siteIdentifier = $site->getIdentifier();
        $newSiteHash = sha1($siteIdentifier . $GLOBALS['TYPO3_CONF_VARS']['SYS']['encryptionKey'] . 'tx_solr');
        $query = $event->getQuery();
        $siteHashFilterQuery = $query->getFilterQuery('siteHash');
        $siteHashFilterQuery->setOptions([
            'query' => 'siteHash:"' . $newSiteHash . '"'
        ]);
    }
}

Services.yaml

services:
  _defaults:
    autowire: true
    autoconfigure: true
    public: false
  Vendor\Solr\:
    resource: '../Classes/*'

  Vendor\Solr\EventListener\ModifyDocumentSiteHash:
    tags:
      - name: event.listener
        identifier: 'Vendor/solr/modify-document-site-hash'

  Vendor\Solr\EventListener\ModifySearchQuerySiteHash:
    tags:
      - name: event.listener
        identifier: 'Vendor/solr/modify-search-query-site-hash'