chore: copy ep_products and ep_theme from EP/website@9593cc8

Copied unchanged from public/typo3conf/ext/ of EP/website at
9593cc8631354f8a363d6609de8b7433f669a9a0 (Git-tracked files only).
History stays in the old repository. Only composer.json files are
added so the extensions install as path packages.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

packages/ep_theme/Classes/Middleware/ReferrerMiddleware.php

@@ -0,0 +1,43 @@
+<?php
+
+namespace EP\EpTheme\Middleware;
+
+use Psr\Http\Message\ResponseInterface;
+use Psr\Http\Message\ServerRequestInterface;
+use Psr\Http\Server\MiddlewareInterface;
+use Psr\Http\Server\RequestHandlerInterface;
+use TYPO3\CMS\Core\Exception\SiteNotFoundException;
+use TYPO3\CMS\Core\Site\SiteFinder;
+use TYPO3\CMS\Core\Utility\GeneralUtility;
+
+class ReferrerMiddleware implements MiddlewareInterface
+{
+    public function process(ServerRequestInterface $request, RequestHandlerInterface $handler): ResponseInterface
+    {
+        $queryParams = $request->getQueryParams();
+
+        if (!array_key_exists('ref', $queryParams)) {
+            return $handler->handle($request);
+        }
+
+        $ref = $queryParams['ref'];
+
+        if (false === is_numeric($ref)) {
+            return $handler->handle($request);
+        }
+
+        /** @var SiteFinder $siteFinder */
+        $siteFinder = GeneralUtility::makeInstance(SiteFinder::class);
+
+        try {
+            $site = $siteFinder->getSiteByPageId((int) $ref);
+            $url = $site->getRouter()->generateUri($ref);
+            $GLOBALS['TSFE']->fe_user->setKey('ses', 'referrer', $url);
+            $GLOBALS['TSFE']->fe_user->storeSessionData();
+        }
+        catch (SiteNotFoundException $exception) {
+        }
+
+        return $handler->handle($request);
+    }
+}