CodeCloud\Bundle\ShopifyBundle\Security\HmacSignature

Complexity

Total Complexity

6

Size/Duplication

Total Lines	64
Duplicated Lines	0 %

Importance

Changes

0

4 Methods

Rating	Name	Duplication	Size	Complexity
A	__construct()	0	3	1
A	isValid()	0	3	1
A	generateHmac()	0	15	3
A	generateParams()	0	10	1

<?php
namespace CodeCloud\Bundle\ShopifyBundle\Security;

class HmacSignature
{
    /**
     * @var string
     */
    private $sharedSecret;

    /**
     * @param string $sharedSecret
     */
    public function __construct(string $sharedSecret)
    {
        $this->sharedSecret = $sharedSecret;
    }

    /**
     * Check if the signature is correct
     * @param string $signature
     * @param array $params
     * @return bool
     */
    public function isValid($signature, array $params)
    {
        return $this->generateHmac($params) === $signature;
    }

    /**
     * Generate parameters to be used to authenticate subsequent requests
     * @param string $storeName
     * @return array
     */
    public function generateParams($storeName)
    {
        $timestamp = time();

        return array(
            'shop'      => (string)$storeName,
            'timestamp' => $timestamp,
            'hmac' => $this->generateHmac(array(
                'shop'      => (string)$storeName,
                'timestamp' => $timestamp
            ))
        );
    }

    /**
     * @param array $params
     * @return string
     */
    private function generateHmac($params)
    {
        $signatureParts = array();

        foreach ($params as $key => $value) {
            if (in_array($key, array('signature', 'hmac'))) {
                continue;
            }

            $signatureParts[] = $key . '=' . $value;
        }

        natsort($signatureParts);

        return hash_hmac('sha256', implode('&', $signatureParts), $this->sharedSecret);
    }
}