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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 $string Text to extract urls and open graph infos from
* @return OpenGraphURLCollection containing the extracted urls
*/
public static function extract($string)
{
$collection = new OpenGraphURLCollection;
if (Config::get()->OPENGRAPH_ENABLE) {
$regexp = StudipCoreFormat::getStudipMarkup('links')['start'];
$matched = preg_match_all('/' . $regexp . '/ums', $string, $matches, PREG_SET_ORDER);
foreach ($matches as $match) {
$url = $match[2];
if (!$url) {
continue;
}
if (!isLinkIntern($url)) {
$og_url = OpenGraphURL::fromURL($url);
if ($og_url && !$collection->find($og_url->id)) {
$og_url->store();
$collection[] = $og_url;
}
}
}
}
return $collection;
}
}
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