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<?php
/**
* Open Graph class that extracts open graph urls from a given string.
*
* @author Jan-Hendrik Willms <tleilax+studip@gmail.com>
* @license GPL2 or any later version
* @since Stud.IP 3.4
*/
class OpenGraph
{
/**
* Extracts urls and their according open graph infos from a given string
*
* @param string|null $string Text to extract urls and open graph infos from
* @return OpenGraphURLCollection containing the extracted urls
*/
public static function extract(?string $string): OpenGraphURLCollection
{
$collection = new OpenGraphURLCollection();
if (!Config::get()->OPENGRAPH_ENABLE || !$string) {
return $collection;
}
if (Studip\Markup::isHtml($string)) {
$urls = self::extractUrlsFromHtml($string);
} else {
$urls = self::extractUrlsFromText($string);
}
foreach ($urls as $url) {
$og_url = OpenGraphURL::fromURL($url);
if ($og_url && !$collection->find($og_url->id)) {
$og_url->store();
$collection[] = $og_url;
}
}
return $collection;
}
public static function filterURLs(array $urls): array
{
return array_filter($urls, function (string $url): bool {
if (!$url) {
return false;
}
return !isLinkIntern($url);
});
}
public static function extractUrlsFromText(string $text): array
{
$regexp = StudipCoreFormat::getStudipMarkup('links')['start'];
preg_match_all('/' . $regexp . '/ums', $text, $matches, PREG_SET_ORDER);
$urls = array_column($matches, 2);
return self::filterURLs($urls);
}
public static function extractUrlsFromHtml(string $html): array
{
$document = new DOMDocument();
$document->loadHTML($html, LIBXML_NOWARNING | LIBXML_NOERROR);
$elements = $document->getElementsByTagName('a');
$urls = [];
foreach ($elements as $element) {
if (!$element->hasAttribute('href')) {
continue;
}
$urls[] = $element->getAttribute('href');
}
return self::filterURLs($urls);
}
}
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