Commercetools\Core\Helper\Uuid

Complexity

Total Complexity

2

Size/Duplication

Total Lines	40
Duplicated Lines	0 %

Coupling/Cohesion

Components	0
Dependencies	0

Test Coverage

Coverage

100%

Importance

Changes	1
Bugs	0	Features	0

2 Methods

Rating	Name	Duplication	Size	Complexity
A	active()	0	4	1
A	uuidv4()	0	10	1

<?php

namespace Commercetools\Core\Helper;

class Uuid
{
    /**
     * return bool
     */
    public static function active()
    {
        return function_exists('random_bytes');
    }

    /**
     * Return a UUID (version 4) using random bytes
     * Note that version 4 follows the format:
     *     xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx
     * where y is one of: [8, 9, A, B]
     *
     * We use (random_bytes(1) & 0x0F) | 0x40 to force
     * the first character of hex value to always be 4
     * in the appropriate position.
     *
     * For 4: http://3v4l.org/q2JN9
     * For Y: http://3v4l.org/EsGSU
     * For the whole shebang: http://3v4l.org/BkjBc
     *
     * @link https://paragonie.com/b/JvICXzh_jhLyt4y3
     * @link https://creativecommons.org/licenses/by-sa/4.0/
     *
     * @return string
     */
    public static function uuidv4()
    {
        return implode('-', [
            bin2hex(random_bytes(4)),
            bin2hex(random_bytes(2)),
            bin2hex(chr((ord(random_bytes(1)) & 0x0F) | 0x40)) . bin2hex(random_bytes(1)),
            bin2hex(chr((ord(random_bytes(1)) & 0x3F) | 0x80)) . bin2hex(random_bytes(1)),
            bin2hex(random_bytes(6))
        ]);
    }
}