1 files changed, 115 insertions, 0 deletions
diff --git a/vendor/symfony/http-kernel/HttpCache/Esi.php b/vendor/symfony/http-kernel/HttpCache/Esi.php
new file mode 100644
index 0000000000..d09907ea62
--- /dev/null
+++ b/vendor/symfony/http-kernel/HttpCache/Esi.php
@@ -0,0 +1,115 @@
+<?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;
+
+/**
+ * Esi implements the ESI capabilities to Request and Response instances.
+ *
+ * For more information, read the following W3C notes:
+ *
+ *  * ESI Language Specification 1.0 (http://www.w3.org/TR/esi-lang)
+ *
+ *  * Edge Architecture Specification (http://www.w3.org/TR/edge-arch)
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Esi extends AbstractSurrogate
+{
+    public function getName()
+    {
+        return 'esi';
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function addSurrogateControl(Response $response)
+    {
+        if (false !== strpos($response->getContent(), '<esi:include')) {
+            $response->headers->set('Surrogate-Control', 'content="ESI/1.0"');
+        }
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function renderIncludeTag($uri, $alt = null, $ignoreErrors = true, $comment = '')
+    {
+        $html = sprintf('<esi:include src="%s"%s%s />',
+            $uri,
+            $ignoreErrors ? ' onerror="continue"' : '',
+            $alt ? sprintf(' alt="%s"', $alt) : ''
+        );
+
+        if (!empty($comment)) {
+            return sprintf("<esi:comment text=\"%s\" />\n%s", $comment, $html);
+        }
+
+        return $html;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function process(Request $request, 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 ESI tags in a plain text response
+        $content = $response->getContent();
+        $content = preg_replace('#<esi\:remove>.*?</esi\:remove>#s', '', $content);
+        $content = preg_replace('#<esi\:comment[^>]+>#s', '', $content);
+
+        $chunks = preg_split('#<esi\:include\s+(.*?)\s*(?:/|</esi\:include)>#', $content, -1, PREG_SPLIT_DELIM_CAPTURE);
+        $chunks[0] = str_replace($this->phpEscapeMap[0], $this->phpEscapeMap[1], $chunks[0]);
+
+        $i = 1;
+        while (isset($chunks[$i])) {
+            $options = array();
+            preg_match_all('/(src|onerror|alt)="([^"]*?)"/', $chunks[$i], $matches, PREG_SET_ORDER);
+            foreach ($matches as $set) {
+                $options[$set[1]] = $set[2];
+            }
+
+            if (!isset($options['src'])) {
+                throw new \RuntimeException('Unable to process an ESI tag without a "src" attribute.');
+            }
+
+            $chunks[$i] = sprintf('<?php echo $this->surrogate->handle($this, %s, %s, %s) ?>'."\n",
+                var_export($options['src'], true),
+                var_export(isset($options['alt']) ? $options['alt'] : '', true),
+                isset($options['onerror']) && 'continue' === $options['onerror'] ? 'true' : 'false'
+            );
+            ++$i;
+            $chunks[$i] = str_replace($this->phpEscapeMap[0], $this->phpEscapeMap[1], $chunks[$i]);
+            ++$i;
+        }
+        $content = implode('', $chunks);
+
+        $response->setContent($content);
+        $response->headers->set('X-Body-Eval', 'ESI');
+
+        // remove ESI/1.0 from the Surrogate-Control header
+        $this->removeFromControl($response);
+    }
+}