65 lines
1.7 KiB
PHP
65 lines
1.7 KiB
PHP
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<?php
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/*
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* This file is part of the Symfony package.
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*
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* (c) Fabien Potencier <fabien@symfony.com>
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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namespace Symfony\Component\WebLink;
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use Psr\Link\LinkInterface;
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/**
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* Serializes a list of Link instances to an HTTP Link header.
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*
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* @see https://tools.ietf.org/html/rfc5988
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*
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* @author Kévin Dunglas <dunglas@gmail.com>
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*/
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final class HttpHeaderSerializer
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{
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/**
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* Builds the value of the "Link" HTTP header.
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*
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* @param LinkInterface[]|\Traversable $links
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*/
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public function serialize(iterable $links): ?string
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{
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$elements = [];
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foreach ($links as $link) {
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if ($link->isTemplated()) {
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continue;
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}
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$attributesParts = ['', sprintf('rel="%s"', implode(' ', $link->getRels()))];
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foreach ($link->getAttributes() as $key => $value) {
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if (\is_array($value)) {
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foreach ($value as $v) {
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$attributesParts[] = sprintf('%s="%s"', $key, preg_replace('/(?<!\\\\)"/', '\"', $v));
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}
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continue;
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}
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if (!\is_bool($value)) {
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$attributesParts[] = sprintf('%s="%s"', $key, preg_replace('/(?<!\\\\)"/', '\"', $value));
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continue;
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}
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if (true === $value) {
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$attributesParts[] = $key;
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}
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}
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$elements[] = sprintf('<%s>%s', $link->getHref(), implode('; ', $attributesParts));
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}
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return $elements ? implode(',', $elements) : null;
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}
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}
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