ContentValidator.php

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<?php
namespace Magento\Downloadable\Model\Sample;

use Magento\Downloadable\Api\Data\SampleInterface;
use Magento\Downloadable\Model\File\ContentValidator as FileContentValidator;
use Magento\Framework\Exception\InputException;
use Magento\Framework\Url\Validator as UrlValidator;

class ContentValidator
{
    protected $urlValidator;

    protected $fileContentValidator;

    public function __construct(
        FileContentValidator $fileContentValidator,
        UrlValidator $urlValidator
    ) {
        $this->fileContentValidator = $fileContentValidator;
        $this->urlValidator = $urlValidator;
    }

    public function isValid(SampleInterface $sample, $validateSampleContent = true)
    {
        if (filter_var($sample->getSortOrder(), FILTER_VALIDATE_INT) === false || $sample->getSortOrder() < 0) {
            throw new InputException(__('Sort order must be a positive integer.'));
        }

        if ($validateSampleContent) {
            $this->validateSampleResource($sample);
        }
        return true;
    }

    protected function validateSampleResource(SampleInterface $sample)
    {
        $sampleFile = $sample->getSampleFileContent();
        if ($sample->getSampleType() == 'file'
            && (!$sampleFile || !$this->fileContentValidator->isValid($sampleFile))
        ) {
            throw new InputException(__('Provided file content must be valid base64 encoded data.'));
        }

        if ($sample->getSampleType() == 'url'
            && !$this->urlValidator->isValid($sample->getSampleUrl())
        ) {
            throw new InputException(__('Sample URL must have valid format.'));
        }
    }
}