55 lines
1.5 KiB
PHP
55 lines
1.5 KiB
PHP
<?php
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declare(strict_types=1);
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namespace Modules\Plugins;
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use CodeIgniter\HTTP\URI;
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use League\CommonMark\Environment\EnvironmentInterface;
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use League\CommonMark\Event\DocumentParsedEvent;
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use League\CommonMark\Extension\CommonMark\Node\Inline\Link;
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class ExternalLinkProcessor
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{
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private EnvironmentInterface $environment;
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public function __construct(EnvironmentInterface $environment)
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{
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$this->environment = $environment;
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}
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public function onDocumentParsed(DocumentParsedEvent $event): void
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{
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$document = $event->getDocument();
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$walker = $document->walker();
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while ($event = $walker->next()) {
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$node = $event->getNode();
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// Only stop at Link nodes when we first encounter them
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if (! ($node instanceof Link) || ! $event->isEntering()) {
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continue;
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}
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$url = $node->getUrl();
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if ($this->isUrlExternal($url)) {
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$node->data->append('attributes/target', '_blank');
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$node->data->append('attributes/rel', 'noopener noreferrer');
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}
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}
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}
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private function isUrlExternal(string $url): bool
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{
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// Only look at http and https URLs
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if (! preg_match('/^https?:\/\//', $url)) {
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return false;
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}
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$host = parse_url($url, PHP_URL_HOST);
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// TODO: load from environment's config
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// return $host != $this->environment->getConfiguration()->get('host');
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return $host !== (new URI(base_url()))->getHost();
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}
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}
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