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<?php
/*
* This file is part of the league/commonmark package.
*
* (c) Colin O'Dell <colinodell@gmail.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace League\CommonMark\Extension\ExternalLink;
use League\CommonMark\EnvironmentInterface;
use League\CommonMark\Event\DocumentParsedEvent;
use League\CommonMark\Inline\Element\Link;
final class ExternalLinkProcessor
{
/** @var EnvironmentInterface */
private $environment;
public function __construct(EnvironmentInterface $environment)
{
$this->environment = $environment;
}
/**
* @param DocumentParsedEvent $e
*
* @return void
*/
public function __invoke(DocumentParsedEvent $e)
{
$internalHosts = $this->environment->getConfig('external_link/internal_hosts', []);
$openInNewWindow = $this->environment->getConfig('external_link/open_in_new_window', false);
$classes = $this->environment->getConfig('external_link/html_class', '');
$walker = $e->getDocument()->walker();
while ($event = $walker->next()) {
if ($event->isEntering() && $event->getNode() instanceof Link) {
/** @var Link $link */
$link = $event->getNode();
$host = parse_url($link->getUrl(), PHP_URL_HOST);
if (empty($host)) {
// Something is terribly wrong with this URL
continue;
}
if (self::hostMatches($host, $internalHosts)) {
$link->data['external'] = false;
continue;
}
// Host does not match our list
$this->markLinkAsExternal($link, $openInNewWindow, $classes);
}
}
}
private function markLinkAsExternal(Link $link, bool $openInNewWindow, string $classes): void
{
$link->data['external'] = true;
$link->data['attributes'] = $link->getData('attributes', []);
$link->data['attributes']['rel'] = 'noopener noreferrer';
if ($openInNewWindow) {
$link->data['attributes']['target'] = '_blank';
}
if (!empty($classes)) {
$link->data['attributes']['class'] = trim(($link->data['attributes']['class'] ?? '') . ' ' . $classes);
}
}
/**
* @param string $host
* @param mixed $compareTo
*
* @return bool
*
* @internal This method is only public so we can easily test it. DO NOT USE THIS OUTSIDE OF THIS EXTENSION!
*/
public static function hostMatches(string $host, $compareTo)
{
foreach ((array) $compareTo as $c) {
if (strpos($c, '/') === 0) {
if (preg_match($c, $host)) {
return true;
}
} elseif ($c === $host) {
return true;
}
}
return false;
}
}
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