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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 StylesheetHandler |
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*/ |
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final class StylesheetHandler extends AbstractLinkHandler |
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{ |
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const TYPE_STYLESHEET = 'stylesheet'; |
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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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* StylesheetHandler 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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if (! $this->options->isStylesheetEnabled()) { |
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return; |
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} |
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$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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$attributes = [ |
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'href' => $attributes['href'], |
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'rel' => $this->options->getStylesheetMode(), |
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'as' => 'script', |
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'type' => $attributes['type'] ?? null, |
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'media' => $attributes['media'] ?? null, |
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]; |
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$attributes = \array_filter($attributes); |
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$attributes['rel'] = $this->options->getStylesheetMode(); |
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$attributes['as'] = 'style'; |
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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 self::TYPE_STYLESHEET === ($attributes['rel'] ?? ''); |
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} |
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} |
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facile-it /
zf-link-headers-module
