AgreementsValidator.php

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<?php
namespace Magento\CheckoutAgreements\Model;

class AgreementsValidator implements \Magento\Checkout\Api\AgreementsValidatorInterface
{
    protected $agreementsProviders;

    public function __construct($list = null)
    {
        $this->agreementsProviders = (array) $list;
    }

    public function isValid($agreementIds = [])
    {
        $agreementIds = $agreementIds === null ? [] : $agreementIds;
        $requiredAgreements = [];
        foreach ($this->agreementsProviders as $agreementsProvider) {
            $requiredAgreements = array_merge($requiredAgreements, $agreementsProvider->getRequiredAgreementIds());
        }
        $agreementsDiff = array_diff($requiredAgreements, $agreementIds);
        return empty($agreementsDiff);
    }
}