|
1
|
|
|
<?php |
|
2
|
|
|
/** |
|
3
|
|
|
* @author Marwan Al-Soltany <[email protected]> |
|
4
|
|
|
* @copyright Marwan Al-Soltany 2020 |
|
5
|
|
|
* For the full copyright and license information, please view |
|
6
|
|
|
* the LICENSE file that was distributed with this source code. |
|
7
|
|
|
*/ |
|
8
|
|
|
|
|
9
|
|
|
namespace MAKS\AmqpAgent\Helper; |
|
10
|
|
|
|
|
11
|
|
|
/** |
|
12
|
|
|
* A class containing miscellaneous helper functions. |
|
13
|
|
|
* @since 2.0.0 |
|
14
|
|
|
*/ |
|
15
|
|
|
final class IDGenerator |
|
16
|
|
|
{ |
|
17
|
|
|
/** |
|
18
|
|
|
* Generates an md5 hash from microtime and uniqid. |
|
19
|
|
|
* @param string $entropy [optional] Additional entropy. |
|
20
|
|
|
* @return string |
|
21
|
|
|
*/ |
|
22
|
4 |
|
public static function generateHash(string $entropy = 'maks-amqp-agent-id'): string |
|
23
|
|
|
{ |
|
24
|
4 |
|
$prefix = sprintf('-%s-[%d]-', $entropy, rand()); |
|
25
|
4 |
|
$symbol = microtime(true) . uniqid($prefix, true); |
|
26
|
|
|
|
|
27
|
4 |
|
return md5($symbol); |
|
28
|
|
|
} |
|
29
|
|
|
|
|
30
|
|
|
/** |
|
31
|
|
|
* Generates a crypto safe unique token. Note that this function is pretty expensive. |
|
32
|
|
|
* @param int $length The length of the token. If the token is hashed this will not be the length of the returned string. |
|
33
|
|
|
* @param string $charset [optional] A string of characters to generate the token from. Defaults to alphanumeric. |
|
34
|
|
|
* @param string $hashing [optional] A name of hashing algorithm to hash the generated token with. Defaults to no hashing. |
|
35
|
|
|
* @return string |
|
36
|
|
|
*/ |
|
37
|
2 |
|
public static function generateToken(int $length = 32, ?string $charset = null, ?string $hashing = null): string |
|
38
|
|
|
{ |
|
39
|
2 |
|
$token = ''; |
|
40
|
2 |
|
$charset = $charset ?? ( |
|
41
|
2 |
|
implode(range('A', 'Z')) . |
|
42
|
2 |
|
implode(range('a', 'z')) . |
|
43
|
2 |
|
implode(range(0, 9)) |
|
44
|
|
|
); |
|
45
|
2 |
|
$max = strlen($charset); |
|
46
|
|
|
|
|
47
|
2 |
|
for ($i = 0; $i < $length; $i++) { |
|
48
|
|
|
$token .= $charset[ |
|
49
|
2 |
|
self::generateCryptoSecureRandom(0, $max - 1) |
|
50
|
|
|
]; |
|
51
|
|
|
} |
|
52
|
|
|
|
|
53
|
2 |
|
return $hashing ? hash($hashing, $token) : $token; |
|
54
|
|
|
} |
|
55
|
|
|
|
|
56
|
|
|
/** |
|
57
|
|
|
* Generates a crypto secure random number. |
|
58
|
|
|
* @param int $min |
|
59
|
|
|
* @param int $max |
|
60
|
|
|
* @return int |
|
61
|
|
|
*/ |
|
62
|
2 |
|
protected static function generateCryptoSecureRandom(int $min, int $max): int |
|
63
|
|
|
{ |
|
64
|
2 |
|
$range = $max - $min; |
|
65
|
2 |
|
if ($range < 1) { |
|
66
|
1 |
|
return $min; |
|
67
|
|
|
} |
|
68
|
|
|
|
|
69
|
2 |
|
$log = ceil(log($range, 2)); |
|
70
|
2 |
|
$bytes = (int)(($log / 8) + 1); // length in bytes |
|
71
|
2 |
|
$bits = (int)($log + 1); // length in bits |
|
72
|
2 |
|
$filter = (int)((1 << $bits) - 1); // set all lower bits to 1 |
|
73
|
|
|
|
|
74
|
|
|
do { |
|
75
|
2 |
|
$random = PHP_VERSION >= 7 |
|
76
|
2 |
|
? random_bytes($bytes) |
|
77
|
2 |
|
: openssl_random_pseudo_bytes($bytes); |
|
78
|
2 |
|
$random = hexdec(bin2hex($random)); |
|
79
|
2 |
|
$random = $random & $filter; // discard irrelevant bits |
|
80
|
2 |
|
} while ($random > $range); |
|
81
|
|
|
|
|
82
|
2 |
|
return $min + $random; |
|
83
|
|
|
} |
|
84
|
|
|
} |
|
85
|
|
|
|
MarwanAlsoltany /
amqp-agent
