UpgradeHashAlgorithmCommand.php

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<?php
namespace Magento\Customer\Console\Command;

use Magento\Customer\Model\Customer;
use Magento\Framework\Encryption\Encryptor;
use Magento\Customer\Model\ResourceModel\Customer\Collection;
use Magento\Customer\Model\ResourceModel\Customer\CollectionFactory;
use Symfony\Component\Console\Command\Command;
use Symfony\Component\Console\Input\InputInterface;
use Symfony\Component\Console\Output\OutputInterface;

class UpgradeHashAlgorithmCommand extends Command
{
    private $customerCollectionFactory;

    private $collection;

    private $encryptor;

    public function __construct(
        CollectionFactory $customerCollectionFactory,
        Encryptor $encryptor
    ) {
        parent::__construct();
        $this->customerCollectionFactory = $customerCollectionFactory;
        $this->encryptor = $encryptor;
    }

    protected function configure()
    {
        $this->setName('customer:hash:upgrade')
            ->setDescription('Upgrade customer\'s hash according to the latest algorithm');
    }

    protected function execute(InputInterface $input, OutputInterface $output)
    {
        $this->collection = $this->customerCollectionFactory->create();
        $this->collection->addAttributeToSelect('*');
        $customerCollection = $this->collection->getItems();
        foreach ($customerCollection as $customer) {
            $customer->load($customer->getId());
            if (!$this->encryptor->validateHashVersion($customer->getPasswordHash())) {
                list($hash, $salt, $version) = explode(Encryptor::DELIMITER, $customer->getPasswordHash(), 3);
                $version .= Encryptor::DELIMITER . Encryptor::HASH_VERSION_LATEST;
                $customer->setPasswordHash($this->encryptor->getHash($hash, $salt, $version));
                $customer->save();
                $output->write(".");
            }
        }
        $output->writeln(".");
        $output->writeln("<info>Finished</info>");
    }
}