Likely a dead end

src/Transcriptor/Response/SingleCookiePassTranscriptor.php

@@ -0,0 +1,26 @@
+<?php
+
+declare(strict_types=1);
+
+namespace brnc\Symfony1\Message\Transcriptor\Response;
+
+use brnc\Symfony1\Message\Exception\LogicException;
+use Psr\Http\Message\ResponseInterface;
+
+/**
+ * Pass-through for a single `Set-Cookie` header.
+ *
+ * Be careful! Mind encoding, multiple cookies with the same name,
+ * esp. conflicts with cookies already staged in Symfony1 (and sent via `setrawcookie()`)
+ */
+class SingleCookiePassTranscriptor implements CookieTranscriptorInterface
+{
+    public function transcribeCookies(ResponseInterface $psrResponse, \sfWebResponse $sfWebResponse): void
+    {
+        $setCookies = $psrResponse->getHeader('Set-Cookie');
+        if (count($setCookies) > 1) {
+            LogicException::throwCookieTranscriptionUnsupported();
+        }
+        $sfWebResponse->setHttpHeader('Set-Cookie', $setCookies[0], true);
+    }
+}