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libraries/vendor/symfony/web-link/HttpHeaderSerializer.php

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+<?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\WebLink;
+
+use Psr\Link\LinkInterface;
+
+/**
+ * Serializes a list of Link instances to an HTTP Link header.
+ *
+ * @see https://tools.ietf.org/html/rfc5988
+ *
+ * @author Kévin Dunglas <dunglas@gmail.com>
+ */
+final class HttpHeaderSerializer
+{
+    /**
+     * Builds the value of the "Link" HTTP header.
+     *
+     * @param LinkInterface[]|\Traversable $links
+     */
+    public function serialize(iterable $links): ?string
+    {
+        $elements = [];
+        foreach ($links as $link) {
+            if ($link->isTemplated()) {
+                continue;
+            }
+
+            $attributesParts = ['', sprintf('rel="%s"', implode(' ', $link->getRels()))];
+            foreach ($link->getAttributes() as $key => $value) {
+                if (\is_array($value)) {
+                    foreach ($value as $v) {
+                        $attributesParts[] = sprintf('%s="%s"', $key, preg_replace('/(?<!\\\\)"/', '\"', $v));
+                    }
+
+                    continue;
+                }
+
+                if (!\is_bool($value)) {
+                    $attributesParts[] = sprintf('%s="%s"', $key, preg_replace('/(?<!\\\\)"/', '\"', $value));
+
+                    continue;
+                }
+
+                if (true === $value) {
+                    $attributesParts[] = $key;
+                }
+            }
+
+            $elements[] = sprintf('<%s>%s', $link->getHref(), implode('; ', $attributesParts));
+        }
+
+        return $elements ? implode(',', $elements) : null;
+    }
+}