parserchain.php

<?php
 
namespace Bitrix\Main\UrlPreview;
 
use Bitrix\Main\ArgumentException;
use Bitrix\Main\Web\Uri;
 
class ParserChain
{
    protected static $metadataParsers =  array(
        'Bitrix\Main\UrlPreview\Parser\OpenGraph',
        'Bitrix\Main\UrlPreview\Parser\SchemaOrg',
        'Bitrix\Main\UrlPreview\Parser\Oembed',
        'Bitrix\Main\UrlPreview\Parser\Common'
    );
 
    protected  static $metadataParsersByHost = [
        'vk.com' => 'Bitrix\Main\UrlPreview\Parser\Vk',
        'www.facebook.com' => 'Bitrix\Main\UrlPreview\Parser\Facebook',
        'www.instagram.com' => 'Bitrix\Main\UrlPreview\Parser\Instagram',
        'maps.apple.com' => 'Bitrix\Main\UrlPreview\Parser\AppleMaps',
        'rutube.ru' => 'Bitrix\Main\UrlPreview\Parser\RuTube',
    ];
 
    protected static function getParserChain(Uri $uri)
    {
        $result = array();
        if(isset(static::$metadataParsersByHost[$uri->getHost()]))
        {
            $result[] = static::$metadataParsersByHost[$uri->getHost()];
        }
 
        $result = array_merge($result, static::$metadataParsers);
 
        return $result;
    }
 
    public static function extractMetadata(HtmlDocument $document)
    {
        foreach(static::getParserChain($document->getUri()) as $parserClassName)
        {
            if(class_exists($parserClassName))
            {
                $parser = new $parserClassName();
                if ($parser instanceof Parser)
                {
                    $parser->handle($document);
                }
            }
            if($document->checkMetadata())
            {
                break;
            }
        }
    }
 
    public static function registerMetadataParser($host, $parserClassName)
    {
        if(!class_exists($parserClassName) || !is_subclass_of($parserClassName, '\Bitrix\Main\UrlPreview\Parser'))
        {
            throw new ArgumentException('Parser class must extend \Bitrix\Main\UrlPreview\Parser', 'parserClassName');
        }
 
        static::$metadataParsersByHost[$host] = $parserClassName;
    }
}