LinkOgData.php

<?php

namespace Statamic\Addons\LinkOgData;

use Statamic\Extend\Extensible;
use GuzzleHttp\Client;
use GuzzleHttp\Psr7\Request;
use Symfony\Component\DomCrawler\Crawler;

class LinkOgData
{
    public function getOgData($url) {
	// Remove all illegal characters from a url
	$url = filter_var($url, FILTER_SANITIZE_URL);

    // Are we looking at a url on this server?
    if (preg_match("/^\//", $url))
    {
        $url = $_SERVER['HTTP_HOST'] . $url;
    }

    // // Make sure we have a protocol
    if (!preg_match("/^http(s)?:\/\//", $url))
    {
        $url = 'http://' . $url;
    }

	if (!filter_var($url, FILTER_VALIDATE_URL))
	{
            return [];
	}

    if (!isset(parse_url($url)['host']) ||
            (!checkdnsrr(parse_url($url)['host'], 'A') &&
            !checkdnsrr(parse_url($url)['host'], 'CNAME')))
        {
            return [];
        }

        // create http client instance
        $client = new Client(['http_errors' => false]);

        // Make an async request
        $request = new Request('GET', $url);
        $result = [
            'og' => [],
            'twitter' => [],
        ];

        try {
            $response = $client->send($request);
        } catch (\Exception $ex) {
            return [];
        }

        if ($response->getStatusCode() != 200)
        {
            return [];
        }

        $crawler = new Crawler(mb_convert_encoding($response->getBody()->getContents(), 'HTML-ENTITIES', "UTF-8"));

	// Title
        $result['title'] = ($crawler->filter('title')->count() > 0) ? $crawler->filter('title')->text() : '';

	// Other meta tags including description, keywords and author
        $meta = $crawler->filter('meta[name="description"], meta[name="keywords"], meta[name="author"]');
        foreach ($meta as $i => $tag) {
            $result[$tag->getAttribute('name')] = $tag->getAttribute('content');
        }

	// OG Tags
        $og_tags = $crawler->filter('meta[property^="og"]');
        foreach ($og_tags as $i => $tag) {
            // extract the values needed
            // get the name of the property, removing `og:` and replacing any remaining `:` with `_`
            $property = preg_replace('/:/', '_', preg_replace('/^og:/', '', $tag->getAttribute('property')));
            // get the value of the property
            $value = $tag->getAttribute('content');
            // add the property to the array
            $result['og'][$property] = $value;
        }

	// Twitter Tags
        $twitter_tags = $crawler->filter('meta[name^="twitter"]');
        foreach ($twitter_tags as $i => $tag) {
            // extract the values needed
            // get the name of the property, removing `og:` and replacing any remaining `:` with `_`
            $property = preg_replace('/:/', '_', preg_replace('/^twitter:/', '', $tag->getAttribute('name')));
            // get the value of the property
            $value = $tag->getAttribute('content');
            // add the property to the array
            $result['twitter'][$property] = $value;
        }

        return $result;
    }
}