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1 |
1 | <?php |
2 | |
3 | namespace MediaWiki\WikispeechSpeechDataCollector; |
4 | |
5 | /** |
6 | * @file |
7 | * @ingroup Extensions |
8 | * @license GPL-2.0-or-later |
9 | */ |
10 | |
11 | use InvalidArgumentException; |
12 | |
13 | /** |
14 | * UUID helper methods. |
15 | * |
16 | * @since 0.1.0 |
17 | */ |
18 | class Uuid { |
19 | |
20 | /** |
21 | * V4, pseudo-random UUID. |
22 | * |
23 | * @return string |
24 | * @see Uuid::v4HexFactory() |
25 | * @since 0.1.0 |
26 | */ |
27 | public static function v4BytesFactory() { |
28 | return self::hexToBytes( self::v4HexFactory() ); |
29 | } |
30 | |
31 | /** |
32 | * Return a UUID (version 4) using random bytes |
33 | * Note that version 4 follows the format: |
34 | * xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx |
35 | * where y is one of: [8, 9, A, B] |
36 | * |
37 | * We use (random_bytes(1) & 0x0F) | 0x40 to force |
38 | * the first character of hex value to always be 4 |
39 | * in the appropriate position. |
40 | * |
41 | * For 4: http://3v4l.org/q2JN9 |
42 | * For Y: http://3v4l.org/EsGSU |
43 | * For the whole shebang: https://3v4l.org/LNgJb |
44 | * |
45 | * https://stackoverflow.com/a/31460273/2224584 |
46 | * https://paragonie.com/b/JvICXzh_jhLyt4y3 |
47 | * |
48 | * @param bool $addDashes If true then '-' is added after byte 4, 6, 8 and 10. |
49 | * @return string |
50 | * @since 0.1.0 |
51 | */ |
52 | public static function v4HexFactory( bool $addDashes = false ) { |
53 | return implode( $addDashes ? '-' : '', [ |
54 | bin2hex( random_bytes( 4 ) ), |
55 | bin2hex( random_bytes( 2 ) ), |
56 | bin2hex( chr( ( ord( random_bytes( 1 ) ) & 0x0F ) | 0x40 ) ) . bin2hex( random_bytes( 1 ) ), |
57 | bin2hex( chr( ( ord( random_bytes( 1 ) ) & 0x3F ) | 0x80 ) ) . bin2hex( random_bytes( 1 ) ), |
58 | bin2hex( random_bytes( 6 ) ) |
59 | ] ); |
60 | } |
61 | |
62 | /** |
63 | * @param string|null $input A valid UUID as bytes or in hex form, or null. |
64 | * @return string|null |
65 | * @throws InvalidArgumentException If not null nor a valid UUID. |
66 | * @since 0.1.0 |
67 | */ |
68 | public static function asBytes( ?string $input ): ?string { |
69 | if ( $input === null ) { |
70 | return null; |
71 | } elseif ( self::isBytes( $input ) ) { |
72 | return $input; |
73 | } elseif ( self::isHex( $input ) ) { |
74 | return self::hexToBytes( $input ); |
75 | } |
76 | throw new InvalidArgumentException( "Not a valid v4 UUID: $input" ); |
77 | } |
78 | |
79 | /** |
80 | * @param string|null $input A valid UUID as bytes or in hex form, or null. |
81 | * @param bool $addDashes If true then '-' is added after byte 4, 6, 8 and 10. |
82 | * @return string|null |
83 | * @throws InvalidArgumentException If not null nor a valid UUID. |
84 | * @since 0.1.0 |
85 | */ |
86 | public static function asHex( ?string $input, bool $addDashes = false ): ?string { |
87 | if ( $input === null ) { |
88 | return null; |
89 | } elseif ( self::isBytes( $input ) ) { |
90 | return self::bytesToHex( $input, $addDashes ); |
91 | } elseif ( self::isHex( $input ) ) { |
92 | return self::hexToHex( $input, $addDashes ); |
93 | } |
94 | throw new InvalidArgumentException( "Not a valid v4 UUID: $input" ); |
95 | } |
96 | |
97 | /** |
98 | * @param string $input |
99 | * @param bool $addDashes If true then '-' is added after byte 4, 6, 8 and 10. |
100 | * @return string |
101 | * @since 0.1.0 |
102 | */ |
103 | private static function bytesToHex( string $input, bool $addDashes = false ): string { |
104 | $hex = bin2hex( $input ); |
105 | if ( !$addDashes ) { |
106 | return $hex; |
107 | } |
108 | return substr( $hex, 0, 8 ) . '-' . |
109 | substr( $hex, 8, 4 ) . '-' . |
110 | substr( $hex, 12, 4 ) . '-' . |
111 | substr( $hex, 16, 4 ) . '-' . |
112 | substr( $hex, 20, 12 ); |
113 | } |
114 | |
115 | /** |
116 | * @param string $input |
117 | * @param bool $addDashes If true then '-' is added after byte 4, 6, 8 and 10. |
118 | * @return string |
119 | * @since 0.1.0 |
120 | */ |
121 | private static function hexToHex( string $input, bool $addDashes = false ): string { |
122 | return self::bytesToHex( self::hexToBytes( $input ), $addDashes ); |
123 | } |
124 | |
125 | /** |
126 | * @param string $input |
127 | * @return string |
128 | * @since 0.1.0 |
129 | */ |
130 | private static function hexToBytes( string $input ): string { |
131 | $numberOfBytes = strlen( $input ); |
132 | if ( $numberOfBytes === 32 ) { |
133 | return hex2bin( $input ); |
134 | } |
135 | // only private internals call to this method, should be safe |
136 | // elseif ( $numberOfBytes == 36 ) { |
137 | $hex = substr( $input, 0, 8 ) . |
138 | substr( $input, 9, 4 ) . |
139 | substr( $input, 14, 4 ) . |
140 | substr( $input, 19, 4 ) . |
141 | substr( $input, 24, 12 ); |
142 | return hex2bin( $hex ); |
143 | } |
144 | |
145 | /** |
146 | * @param string $input |
147 | * @return bool True if input is a valid raw 16 byte UUID V4. |
148 | * @since 0.1.0 |
149 | */ |
150 | public static function isBytes( string $input ): bool { |
151 | return strlen( $input ) === 16 |
152 | && self::isHex( self::bytesToHex( $input, true ) ); |
153 | } |
154 | |
155 | /** |
156 | * @param string $input |
157 | * @return bool True if input is a valid hex formatted UUID V4 with or without dashes. |
158 | * @since 0.1.0 |
159 | */ |
160 | public static function isHex( string $input ): bool { |
161 | return preg_match( |
162 | '/^[0-9A-F]{8}(-?)[0-9A-F]{4}(\1)4[0-9A-F]{3}(\1)[89AB][0-9A-F]{3}(\1)[0-9A-F]{12}$/i', |
163 | $input |
164 | ); |
165 | } |
166 | |
167 | } |