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
|
<?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\Generator;
use Ramsey\Uuid\Converter\NumberConverterInterface;
use Ramsey\Uuid\Exception\DceSecurityException;
use Ramsey\Uuid\Provider\DceSecurityProviderInterface;
use Ramsey\Uuid\Type\Hexadecimal;
use Ramsey\Uuid\Type\Integer as IntegerObject;
use Ramsey\Uuid\Uuid;
use function hex2bin;
use function in_array;
use function pack;
use function str_pad;
use function strlen;
use function substr_replace;
use const STR_PAD_LEFT;
/**
* DceSecurityGenerator generates strings of binary data based on a local
* domain, local identifier, node ID, clock sequence, and the current time
*/
class DceSecurityGenerator implements DceSecurityGeneratorInterface
{
private const DOMAINS = [
Uuid::DCE_DOMAIN_PERSON,
Uuid::DCE_DOMAIN_GROUP,
Uuid::DCE_DOMAIN_ORG,
];
/**
* Upper bounds for the clock sequence in DCE Security UUIDs.
*/
private const CLOCK_SEQ_HIGH = 63;
/**
* Lower bounds for the clock sequence in DCE Security UUIDs.
*/
private const CLOCK_SEQ_LOW = 0;
/**
* @var NumberConverterInterface
*/
private $numberConverter;
/**
* @var TimeGeneratorInterface
*/
private $timeGenerator;
/**
* @var DceSecurityProviderInterface
*/
private $dceSecurityProvider;
public function __construct(
NumberConverterInterface $numberConverter,
TimeGeneratorInterface $timeGenerator,
DceSecurityProviderInterface $dceSecurityProvider
) {
$this->numberConverter = $numberConverter;
$this->timeGenerator = $timeGenerator;
$this->dceSecurityProvider = $dceSecurityProvider;
}
public function generate(
int $localDomain,
?IntegerObject $localIdentifier = null,
?Hexadecimal $node = null,
?int $clockSeq = null
): string {
if (!in_array($localDomain, self::DOMAINS)) {
throw new DceSecurityException(
'Local domain must be a valid DCE Security domain'
);
}
if ($localIdentifier && $localIdentifier->isNegative()) {
throw new DceSecurityException(
'Local identifier out of bounds; it must be a value between 0 and 4294967295'
);
}
if ($clockSeq > self::CLOCK_SEQ_HIGH || $clockSeq < self::CLOCK_SEQ_LOW) {
throw new DceSecurityException(
'Clock sequence out of bounds; it must be a value between 0 and 63'
);
}
switch ($localDomain) {
case Uuid::DCE_DOMAIN_ORG:
if ($localIdentifier === null) {
throw new DceSecurityException(
'A local identifier must be provided for the org domain'
);
}
break;
case Uuid::DCE_DOMAIN_PERSON:
if ($localIdentifier === null) {
$localIdentifier = $this->dceSecurityProvider->getUid();
}
break;
case Uuid::DCE_DOMAIN_GROUP:
default:
if ($localIdentifier === null) {
$localIdentifier = $this->dceSecurityProvider->getGid();
}
break;
}
$identifierHex = $this->numberConverter->toHex($localIdentifier->toString());
// The maximum value for the local identifier is 0xffffffff, or
// 4294967295. This is 8 hexadecimal digits, so if the length of
// hexadecimal digits is greater than 8, we know the value is greater
// than 0xffffffff.
if (strlen($identifierHex) > 8) {
throw new DceSecurityException(
'Local identifier out of bounds; it must be a value between 0 and 4294967295'
);
}
$domainByte = pack('n', $localDomain)[1];
$identifierBytes = (string) hex2bin(str_pad($identifierHex, 8, '0', STR_PAD_LEFT));
if ($node instanceof Hexadecimal) {
$node = $node->toString();
}
// Shift the clock sequence 8 bits to the left, so it matches 0x3f00.
if ($clockSeq !== null) {
$clockSeq = $clockSeq << 8;
}
$bytes = $this->timeGenerator->generate($node, $clockSeq);
// Replace bytes in the time-based UUID with DCE Security values.
$bytes = substr_replace($bytes, $identifierBytes, 0, 4);
$bytes = substr_replace($bytes, $domainByte, 9, 1);
return $bytes;
}
}
|
