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<?php
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/**
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* This file is part of the ramsey/uuid library
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*
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* @copyright Copyright (c) Ben Ramsey <ben@benramsey.com>
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* @license http://opensource.org/licenses/MIT MIT
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*/
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declare(strict_types=1);
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namespace Ramsey\Uuid\Provider\Node;
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use Ramsey\Uuid\Exception\InvalidArgumentException;
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use Ramsey\Uuid\Provider\NodeProviderInterface;
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use Ramsey\Uuid\Type\Hexadecimal;
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use function dechex;
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use function hexdec;
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use function str_pad;
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use function substr;
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use const STR_PAD_LEFT;
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/**
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* StaticNodeProvider provides a static node value with the multicast bit set
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*
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* @link http://tools.ietf.org/html/rfc4122#section-4.5 RFC 4122, § 4.5: Node IDs that Do Not Identify the Host
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*/
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class StaticNodeProvider implements NodeProviderInterface
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{
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private Hexadecimal $node;
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/**
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* @param Hexadecimal $node The static node value to use
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*/
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public function __construct(Hexadecimal $node)
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{
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if (strlen($node->toString()) > 12) {
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throw new InvalidArgumentException(
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'Static node value cannot be greater than 12 hexadecimal characters'
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);
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}
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$this->node = $this->setMulticastBit($node);
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}
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public function getNode(): Hexadecimal
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{
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return $this->node;
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}
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/**
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* Set the multicast bit for the static node value
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*/
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private function setMulticastBit(Hexadecimal $node): Hexadecimal
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{
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$nodeHex = str_pad($node->toString(), 12, '0', STR_PAD_LEFT);
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$firstOctet = substr($nodeHex, 0, 2);
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$firstOctet = str_pad(
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dechex(hexdec($firstOctet) | 0x01),
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2,
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'0',
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STR_PAD_LEFT
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);
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return new Hexadecimal($firstOctet . substr($nodeHex, 2));
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}
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}
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