aboutsummaryrefslogtreecommitdiffstats
path: root/vendor/ramsey/uuid/src/Rfc4122/Fields.php
blob: 9acf810c21496f4e29db3b570c1c01e0839d253e (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
<?php

/**
 * This file is part of the ramsey/uuid library
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 *
 * @copyright Copyright (c) Ben Ramsey <ben@benramsey.com>
 * @license http://opensource.org/licenses/MIT MIT
 */

declare(strict_types=1);

namespace Ramsey\Uuid\Rfc4122;

use Ramsey\Uuid\Exception\InvalidArgumentException;
use Ramsey\Uuid\Fields\SerializableFieldsTrait;
use Ramsey\Uuid\Type\Hexadecimal;
use Ramsey\Uuid\Uuid;

use function bin2hex;
use function dechex;
use function hexdec;
use function sprintf;
use function str_pad;
use function strlen;
use function substr;
use function unpack;

use const STR_PAD_LEFT;

/**
 * RFC 4122 variant UUIDs are comprised of a set of named fields
 *
 * Internally, this class represents the fields together as a 16-byte binary
 * string.
 *
 * @psalm-immutable
 */
final class Fields implements FieldsInterface
{
    use MaxTrait;
    use NilTrait;
    use SerializableFieldsTrait;
    use VariantTrait;
    use VersionTrait;

    /**
     * @param string $bytes A 16-byte binary string representation of a UUID
     *
     * @throws InvalidArgumentException if the byte string is not exactly 16 bytes
     * @throws InvalidArgumentException if the byte string does not represent an RFC 4122 UUID
     * @throws InvalidArgumentException if the byte string does not contain a valid version
     */
    public function __construct(private string $bytes)
    {
        if (strlen($this->bytes) !== 16) {
            throw new InvalidArgumentException(
                'The byte string must be 16 bytes long; '
                . 'received ' . strlen($this->bytes) . ' bytes'
            );
        }

        if (!$this->isCorrectVariant()) {
            throw new InvalidArgumentException(
                'The byte string received does not conform to the RFC 4122 variant'
            );
        }

        if (!$this->isCorrectVersion()) {
            throw new InvalidArgumentException(
                'The byte string received does not contain a valid RFC 4122 version'
            );
        }
    }

    public function getBytes(): string
    {
        return $this->bytes;
    }

    public function getClockSeq(): Hexadecimal
    {
        if ($this->isMax()) {
            $clockSeq = 0xffff;
        } elseif ($this->isNil()) {
            $clockSeq = 0x0000;
        } else {
            $clockSeq = hexdec(bin2hex(substr($this->bytes, 8, 2))) & 0x3fff;
        }

        return new Hexadecimal(str_pad(dechex($clockSeq), 4, '0', STR_PAD_LEFT));
    }

    public function getClockSeqHiAndReserved(): Hexadecimal
    {
        return new Hexadecimal(bin2hex(substr($this->bytes, 8, 1)));
    }

    public function getClockSeqLow(): Hexadecimal
    {
        return new Hexadecimal(bin2hex(substr($this->bytes, 9, 1)));
    }

    public function getNode(): Hexadecimal
    {
        return new Hexadecimal(bin2hex(substr($this->bytes, 10)));
    }

    public function getTimeHiAndVersion(): Hexadecimal
    {
        return new Hexadecimal(bin2hex(substr($this->bytes, 6, 2)));
    }

    public function getTimeLow(): Hexadecimal
    {
        return new Hexadecimal(bin2hex(substr($this->bytes, 0, 4)));
    }

    public function getTimeMid(): Hexadecimal
    {
        return new Hexadecimal(bin2hex(substr($this->bytes, 4, 2)));
    }

    /**
     * Returns the full 60-bit timestamp, without the version
     *
     * For version 2 UUIDs, the time_low field is the local identifier and
     * should not be returned as part of the time. For this reason, we set the
     * bottom 32 bits of the timestamp to 0's. As a result, there is some loss
     * of fidelity of the timestamp, for version 2 UUIDs. The timestamp can be
     * off by a range of 0 to 429.4967295 seconds (or 7 minutes, 9 seconds, and
     * 496730 microseconds).
     *
     * For version 6 UUIDs, the timestamp order is reversed from the typical RFC
     * 4122 order (the time bits are in the correct bit order, so that it is
     * monotonically increasing). In returning the timestamp value, we put the
     * bits in the order: time_low + time_mid + time_hi.
     */
    public function getTimestamp(): Hexadecimal
    {
        $timestamp = match ($this->getVersion()) {
            Uuid::UUID_TYPE_DCE_SECURITY => sprintf(
                '%03x%04s%08s',
                hexdec($this->getTimeHiAndVersion()->toString()) & 0x0fff,
                $this->getTimeMid()->toString(),
                ''
            ),
            Uuid::UUID_TYPE_REORDERED_TIME => sprintf(
                '%08s%04s%03x',
                $this->getTimeLow()->toString(),
                $this->getTimeMid()->toString(),
                hexdec($this->getTimeHiAndVersion()->toString()) & 0x0fff
            ),
            // The Unix timestamp in version 7 UUIDs is a 48-bit number,
            // but for consistency, we will return a 60-bit number, padded
            // to the left with zeros.
            Uuid::UUID_TYPE_UNIX_TIME => sprintf(
                '%011s%04s',
                $this->getTimeLow()->toString(),
                $this->getTimeMid()->toString(),
            ),
            default => sprintf(
                '%03x%04s%08s',
                hexdec($this->getTimeHiAndVersion()->toString()) & 0x0fff,
                $this->getTimeMid()->toString(),
                $this->getTimeLow()->toString()
            ),
        };

        return new Hexadecimal($timestamp);
    }

    public function getVersion(): ?int
    {
        if ($this->isNil() || $this->isMax()) {
            return null;
        }

        /** @var int[] $parts */
        $parts = unpack('n*', $this->bytes);

        return $parts[4] >> 12;
    }

    private function isCorrectVariant(): bool
    {
        if ($this->isNil() || $this->isMax()) {
            return true;
        }

        return $this->getVariant() === Uuid::RFC_4122;
    }
}