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| 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 | } |