Koded\Stdlib\UUID::v1()

Complexity

Conditions	8
Paths	1

Size

Total Lines	89
Code Lines	44

Duplication

Lines	0
Ratio	0 %

Importance

Changes	6
Bugs	2	Features	0

<?php declare(strict_types=1);
    public static function v1($address = null): string
    {
        static $matches = [[null], [null]];

        /**
         * Get the hardware address as a 48-bit positive integer.
         *
         * @param string $node [optional]
         *
         * @return null|string
         * @throws InvalidArgumentException
         */
        $node = function($node = null) use (&$matches) {
            if (null === $node) {
                if (empty($matches[1][0])) {
                    // Get MAC address (Linux server LAN)
                    $info = `ifconfig 2>&1` ?: '';

                    // Cache the info in $matches
                    preg_match_all('~[^:]([a-f0-9]{2}([:-])[a-f0-9]{2}(\2[a-f0-9]{2}){4})[^:]~i',
                        $info,
                        $matches,
                        PREG_PATTERN_ORDER
                    );
                }

                $node = $matches[1][0] ?? null;

                // Cannot identify host, fallback as in http://tools.ietf.org/html/rfc4122#section-4.5
                if (empty($node)) {
                    // @codeCoverageIgnoreStart
                    $node = sprintf('%06x%06x', mt_rand(0, 1 << 24), mt_rand(0, 1 << 24));
                    // @codeCoverageIgnoreEnd
                }
            }

            $node = str_replace([':', '-'], '', $node);

            if (ctype_digit($node)) {
                $node = sprintf('%012x', $node);
            }

            if (ctype_xdigit($node) && strlen($node) <= 12) {
                $node = strtolower(sprintf('%012s', $node));
            } else {
                throw new InvalidArgumentException('UUID invalid node value');
            }

            return $node;
        }; // end $node

        $clockSeq = function() {
            // Random 14-bit sequence number, http://tools.ietf.org/html/rfc4122#section-4.2.1.1
            return mt_rand(0, 1 << 14);
        };

        $uuidTime = function() {
            // 0x01b21dd213814000 is a 100 nanoseconds interval between UUID epoch
            // and UNIX epoch datetime (15/10/1582 00:00:01 - 01/01/1970 00:00:01)
            $time = gettimeofday();
            $time = ($time['sec'] * 10000000) + ($time['usec'] * 10) + 0x01b21dd213814000;

            return [
                'low' => sprintf('%08x', $time & 0xffffffff),
                'mid' => sprintf('%04x', ($time >> 32) & 0xffff),
                'high' => sprintf('%04x', ($time >> 48) & 0x0fff)
            ];
        };

        $uuidTime = $uuidTime();
        $clockSeq = $clockSeq();

        // Set to version 1
        $version = hexdec($uuidTime['high']) & 0x0fff;
        $version &= ~(0xf000);
        $version |= 1 << 12;

        // RFC 4122
        $variant = ($clockSeq >> 8) & 0x3f;
        $variant &= ~(0xc0);
        $variant |= 0x80;

        return sprintf('%08s-%04s-%04x-%02x%02x-%012s',
            $uuidTime['low'],
            $uuidTime['mid'],
            $version,
            $variant,
            $clockSeq & 0xff,
            $node($address)
        );