General.php

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<?php
namespace Magento\Customer\Model\Address\Validator;

use Magento\Customer\Model\Address\AbstractAddress;
use Magento\Customer\Model\Address\ValidatorInterface;

class General implements ValidatorInterface
{
    private $eavConfig;

    private $directoryData;

    public function __construct(
        \Magento\Eav\Model\Config $eavConfig,
        \Magento\Directory\Helper\Data $directoryData
    ) {
        $this->eavConfig = $eavConfig;
        $this->directoryData = $directoryData;
    }

    public function validate(AbstractAddress $address)
    {
        $errors = array_merge(
            $this->checkRequredFields($address),
            $this->checkOptionalFields($address)
        );

        return $errors;
    }

    private function checkRequredFields(AbstractAddress $address)
    {
        $errors = [];
        if (!\Zend_Validate::is($address->getFirstname(), 'NotEmpty')) {
            $errors[] = __('"%fieldName" is required. Enter and try again.', ['fieldName' => 'firstname']);
        }

        if (!\Zend_Validate::is($address->getLastname(), 'NotEmpty')) {
            $errors[] = __('"%fieldName" is required. Enter and try again.', ['fieldName' => 'lastname']);
        }

        if (!\Zend_Validate::is($address->getStreetLine(1), 'NotEmpty')) {
            $errors[] = __('"%fieldName" is required. Enter and try again.', ['fieldName' => 'street']);
        }

        if (!\Zend_Validate::is($address->getCity(), 'NotEmpty')) {
            $errors[] = __('"%fieldName" is required. Enter and try again.', ['fieldName' => 'city']);
        }

        return $errors;
    }

    private function checkOptionalFields(AbstractAddress $address)
    {
        $errors = [];
        if ($this->isTelephoneRequired()
            && !\Zend_Validate::is($address->getTelephone(), 'NotEmpty')
        ) {
            $errors[] = __('"%fieldName" is required. Enter and try again.', ['fieldName' => 'telephone']);
        }

        if ($this->isFaxRequired()
            && !\Zend_Validate::is($address->getFax(), 'NotEmpty')
        ) {
            $errors[] = __('"%fieldName" is required. Enter and try again.', ['fieldName' => 'fax']);
        }

        if ($this->isCompanyRequired()
            && !\Zend_Validate::is($address->getCompany(), 'NotEmpty')
        ) {
            $errors[] = __('"%fieldName" is required. Enter and try again.', ['fieldName' => 'company']);
        }

        $havingOptionalZip = $this->directoryData->getCountriesWithOptionalZip();
        if (!in_array($address->getCountryId(), $havingOptionalZip)
            && !\Zend_Validate::is($address->getPostcode(), 'NotEmpty')
        ) {
            $errors[] = __('"%fieldName" is required. Enter and try again.', ['fieldName' => 'postcode']);
        }

        return $errors;
    }

    private function isCompanyRequired()
    {
        return $this->eavConfig->getAttribute('customer_address', 'company')->getIsRequired();
    }

    private function isTelephoneRequired()
    {
        return $this->eavConfig->getAttribute('customer_address', 'telephone')->getIsRequired();
    }

    private function isFaxRequired()
    {
        return $this->eavConfig->getAttribute('customer_address', 'fax')->getIsRequired();
    }
}