Codegenerator.php

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<?php
namespace Magento\SalesRule\Model\Coupon;

class Codegenerator extends \Magento\Framework\DataObject implements CodegeneratorInterface
{
    const DEFAULT_LENGTH_MIN = 16;

    const DEFAULT_LENGTH_MAX = 32;

    const SYMBOLS_COLLECTION = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';

    const DEFAULT_DELIMITER = '-';

    public function generateCode()
    {
        $alphabet = $this->getAlphabet() ? $this->getAlphabet() : static::SYMBOLS_COLLECTION;
        $length = $this->getActualLength();
        $code = '';
        for ($i = 0, $indexMax = strlen($alphabet) - 1; $i < $length; ++$i) {
            $code .= substr($alphabet, random_int(0, $indexMax), 1);
        }

        return $code;
    }

    protected function getActualLength()
    {
        $lengthMin = $this->getLengthMin() ? $this->getLengthMin() : static::DEFAULT_LENGTH_MIN;
        $lengthMax = $this->getLengthMax() ? $this->getLengthMax() : static::DEFAULT_LENGTH_MAX;

        return $this->getLength() ? $this->getLength() : random_int($lengthMin, $lengthMax);
    }

    public function getDelimiter()
    {
        return $this->hasData('delimiter') ? $this->getData('delimiter') : static::DEFAULT_DELIMITER;
    }
}