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<?php |
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declare(strict_types=1); |
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namespace Facile\ZFLinkHeadersModule\Listener; |
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use Facile\ZFLinkHeadersModule\OptionsInterface; |
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use Zend\Http\PhpEnvironment\Response; |
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use Zend\Mvc\MvcEvent; |
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use Zend\View\Helper\HeadLink; |
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/** |
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* Class LinkHandler |
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*/ |
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final class LinkHandler extends AbstractLinkHandler |
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{ |
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const ALLOWED_RELS = [ |
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OptionsInterface::MODE_PRELOAD, |
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OptionsInterface::MODE_PREFETCH, |
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OptionsInterface::MODE_DNS_PREFETCH, |
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OptionsInterface::MODE_PRECONNECT, |
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OptionsInterface::MODE_PRERENDER, |
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]; |
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/** |
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* @var HeadLink |
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*/ |
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private $headLink; |
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/** |
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* @var OptionsInterface |
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*/ |
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private $options; |
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/** |
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* LinkHandler constructor. |
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* |
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* @param HeadLink $headLink |
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* @param OptionsInterface $options |
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*/ |
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public function __construct(HeadLink $headLink, OptionsInterface $options) |
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{ |
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$this->headLink = $headLink; |
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$this->options = $options; |
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} |
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/** |
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* @param MvcEvent $event |
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*/ |
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public function __invoke(MvcEvent $event) |
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{ |
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$response = $event->getResponse(); |
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if (! $response instanceof Response) { |
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return; |
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} |
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$values = []; |
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foreach ($this->headLink->getContainer() as $item) { |
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$attributes = \get_object_vars($item); |
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if (! $this->canInjectLink($attributes)) { |
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continue; |
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} |
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if (! $this->options->isHttp2PushEnabled()) { |
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$attributes['nopush'] = null; |
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} |
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$values[] = $this->createLinkHeaderValue($attributes); |
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} |
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$this->addLinkHeader($response, $values); |
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} |
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/** |
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* Whether the link is valid to be injected in headers |
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* |
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* @param array $attributes |
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* @return bool |
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*/ |
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private function canInjectLink(array $attributes): bool |
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{ |
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if (empty($attributes['href'] ?? '')) { |
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return false; |
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} |
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return \in_array($attributes['rel'] ?? '', self::ALLOWED_RELS, true); |
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} |
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} |
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facile-it /
zf-link-headers-module
