first commit

vendor/symfony/http-kernel/HttpCache/Ssi.php

@@ -0,0 +1,86 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\HttpKernel\HttpCache;
+
+use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpFoundation\Response;
+
+/**
+ * Ssi implements the SSI capabilities to Request and Response instances.
+ *
+ * @author Sebastian Krebs <krebs.seb@gmail.com>
+ */
+class Ssi extends AbstractSurrogate
+{
+    public function getName(): string
+    {
+        return 'ssi';
+    }
+
+    /**
+     * @return void
+     */
+    public function addSurrogateControl(Response $response)
+    {
+        if (str_contains($response->getContent(), '<!--#include')) {
+            $response->headers->set('Surrogate-Control', 'content="SSI/1.0"');
+        }
+    }
+
+    public function renderIncludeTag(string $uri, ?string $alt = null, bool $ignoreErrors = true, string $comment = ''): string
+    {
+        return sprintf('<!--#include virtual="%s" -->', $uri);
+    }
+
+    public function process(Request $request, Response $response): Response
+    {
+        $type = $response->headers->get('Content-Type');
+        if (empty($type)) {
+            $type = 'text/html';
+        }
+
+        $parts = explode(';', $type);
+        if (!\in_array($parts[0], $this->contentTypes)) {
+            return $response;
+        }
+
+        // we don't use a proper XML parser here as we can have SSI tags in a plain text response
+        $content = $response->getContent();
+        $boundary = self::generateBodyEvalBoundary();
+        $chunks = preg_split('#<!--\#include\s+(.*?)\s*-->#', $content, -1, \PREG_SPLIT_DELIM_CAPTURE);
+
+        $i = 1;
+        while (isset($chunks[$i])) {
+            $options = [];
+            preg_match_all('/(virtual)="([^"]*?)"/', $chunks[$i], $matches, \PREG_SET_ORDER);
+            foreach ($matches as $set) {
+                $options[$set[1]] = $set[2];
+            }
+
+            if (!isset($options['virtual'])) {
+                throw new \RuntimeException('Unable to process an SSI tag without a "virtual" attribute.');
+            }
+
+            $chunks[$i] = $boundary.$options['virtual']."\n\n\n";
+            $i += 2;
+        }
+        $content = $boundary.implode('', $chunks).$boundary;
+
+        $response->setContent($content);
+        $response->headers->set('X-Body-Eval', 'SSI');
+
+        // remove SSI/1.0 from the Surrogate-Control header
+        $this->removeFromControl($response);
+
+        return $response;
+    }
+}