Oauth.php

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<?php
namespace Magento\Framework\Oauth\Helper;

class Oauth
{
    const LENGTH_TOKEN = 32;

    const LENGTH_TOKEN_SECRET = 32;

    const LENGTH_TOKEN_VERIFIER = 32;

    const LENGTH_CONSUMER_KEY = 32;

    const LENGTH_CONSUMER_SECRET = 32;

    const LENGTH_NONCE = 32;

    const CALLBACK_ESTABLISHED = 'oob';

    protected $_mathRandom;

    public function __construct(\Magento\Framework\Math\Random $mathRandom)
    {
        $this->_mathRandom = $mathRandom;
    }

    public function generateRandomString($length)
    {
        return $this->_mathRandom->getRandomString(
            $length,
            \Magento\Framework\Math\Random::CHARS_DIGITS . \Magento\Framework\Math\Random::CHARS_LOWERS
        );
    }

    public function generateToken()
    {
        return $this->generateRandomString(self::LENGTH_TOKEN);
    }

    public function generateTokenSecret()
    {
        return $this->generateRandomString(self::LENGTH_TOKEN_SECRET);
    }

    public function generateVerifier()
    {
        return $this->generateRandomString(self::LENGTH_TOKEN_VERIFIER);
    }

    public function generateConsumerKey()
    {
        return $this->generateRandomString(self::LENGTH_CONSUMER_KEY);
    }

    public function generateConsumerSecret()
    {
        return $this->generateRandomString(self::LENGTH_CONSUMER_SECRET);
    }
}