ContainsHtmlValidator.php

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<?php
 
declare(strict_types=1);
 
namespace ILIAS\WebDAV\Mount;
 
use DOMDocument;
use Exception;
use Throwable;
use RecursiveIteratorIterator;
use ilHtmlDomNodeIterator;
 
class ContainsHtmlValidator
{
    public function __construct(private string $text)
    {
    }
 
    public function isValid(): bool
    {
        if (!preg_match('/<[^>]+?>/', $this->text)) {
            return false;
        }
 
        try {
            $dom = new DOMDocument();
            if (!$dom->loadHTML($this->text)) {
                return false;
            }
 
            $iter = new RecursiveIteratorIterator(
                new ilHtmlDomNodeIterator($dom),
                RecursiveIteratorIterator::SELF_FIRST
            );
            foreach ($iter as $element) {
                if (strtolower((string) $element->nodeName) === 'body') {
                    continue;
                }
 
                if ($element->nodeType === XML_ELEMENT_NODE) {
                    return true;
                }
            }
        } catch (Exception | Throwable) {
            return false;
        }
 
        return false;
    }
}