ExistingValidate.php

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<?php
declare(strict_types=1);

namespace Magento\Catalog\Model\Product\Option\Type\File;

class ExistingValidate extends \Zend_Validate
{
    public function isValid($value, string $originalName = null)
    {
        $this->_messages = [];
        $this->_errors = [];

        if (!is_string($value)) {
            $this->_messages[] = __('Full file path is expected.')->render();
            return false;
        }

        $result = true;
        $fileInfo = null;
        if ($originalName) {
            $fileInfo = ['name' => $originalName];
        }
        foreach ($this->_validators as $element) {
            $validator = $element['instance'];
            if ($validator->isValid($value, $fileInfo)) {
                continue;
            }
            $result = false;
            $messages = $validator->getMessages();
            $this->_messages = array_merge($this->_messages, $messages);
            $this->_errors = array_merge($this->_errors, array_keys($messages));
            if ($element['breakChainOnFailure']) {
                break;
            }
        }
        return $result;
    }
}