platine-php /
webauthn
| Total Complexity | 43 |
| Total Lines | 261 |
| Duplicated Lines | 0 % |
| Changes | 1 | ||
| Bugs | 0 | Features | 0 |
Complex classes like CborDecoder often do a lot of different things. To break such a class down, we need to identify a cohesive component within that class. A common approach to find such a component is to look for fields/methods that share the same prefixes, or suffixes.
Once you have determined the fields that belong together, you can apply the Extract Class refactoring. If the component makes sense as a sub-class, Extract Subclass is also a candidate, and is often faster.
While breaking up the class, it is a good idea to analyze how other classes use CborDecoder, and based on these observations, apply Extract Interface, too.
| 1 | <?php |
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| 42 | class CborDecoder |
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| 43 | { |
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| 44 | public const CBOR_MAJOR_UNSIGNED_INT = 0; |
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| 45 | public const CBOR_MAJOR_NEGATIVE_INT = 1; |
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| 46 | public const CBOR_MAJOR_BYTE_STRING = 2; |
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| 47 | public const CBOR_MAJOR_TEXT_STRING = 3; |
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| 48 | public const CBOR_MAJOR_ARRAY = 4; |
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| 49 | public const CBOR_MAJOR_MAP = 5; |
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| 50 | public const CBOR_MAJOR_TAG = 6; |
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| 51 | public const CBOR_MAJOR_FLOAT_SIMPLE = 7; |
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| 52 | |||
| 53 | /** |
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| 54 | * Decode the given data |
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| 55 | * @param ByteBuffer|string $data |
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| 56 | * @return mixed |
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| 57 | */ |
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| 58 | public static function decode($data) |
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| 59 | { |
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| 60 | if (is_string($data)) { |
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| 61 | $data = new ByteBuffer($data); |
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| 62 | } |
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| 63 | |||
| 64 | $offset = 0; |
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| 65 | $result = self::parseItem($data, $offset); |
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| 66 | if ($offset !== $data->getLength()) { |
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| 67 | throw new WebauthnException(sprintf( |
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| 68 | 'There still unsed bytes [%d] after parse data', |
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| 69 | abs($offset - $data->getLength()) |
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| 70 | )); |
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| 71 | } |
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| 72 | |||
| 73 | return $result; |
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| 74 | } |
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| 75 | |||
| 76 | /** |
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| 77 | * Decode the data using custom start and end offset |
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| 78 | * @param ByteBuffer|string $data |
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| 79 | * @param int $startoffset |
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| 80 | * @param int|null $endOffset |
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| 81 | * @return mixed |
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| 82 | */ |
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| 83 | public static function decodeInPlace($data, int $startoffset, ?int $endOffset = null) |
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| 84 | { |
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| 85 | if (is_string($data)) { |
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| 86 | $data = new ByteBuffer($data); |
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| 87 | } |
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| 88 | |||
| 89 | $offset = $startoffset; |
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| 90 | $result = self::parseItem($data, $offset); |
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| 91 | $endOffset = $offset; |
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| 92 | |||
| 93 | return $result; |
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| 94 | } |
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| 95 | |||
| 96 | /** |
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| 97 | * Parse the item in the given offset |
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| 98 | * @param ByteBuffer $buffer |
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| 99 | * @param int $offset |
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| 100 | * @return mixed |
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| 101 | */ |
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| 102 | protected static function parseItem(ByteBuffer $buffer, int &$offset) |
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| 103 | { |
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| 104 | $first = $buffer->getByteValue($offset++); |
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| 105 | $type = $first >> 5; |
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| 106 | $value = $first & 0b11111; |
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| 107 | if ($type === self::CBOR_MAJOR_FLOAT_SIMPLE) { |
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| 108 | return self::parseSimpleFloat($value, $buffer, $offset); |
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| 109 | } |
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| 110 | |||
| 111 | $val = self::extractLength($value, $buffer, $offset); |
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| 112 | |||
| 113 | return self::parseItemData($type, $val, $buffer, $offset); |
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| 114 | } |
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| 115 | |||
| 116 | /** |
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| 117 | * Parse the simple float value |
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| 118 | * @param int $value |
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| 119 | * @param ByteBuffer $buffer |
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| 120 | * @param int $offset |
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| 121 | * @return mixed |
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| 122 | */ |
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| 123 | protected static function parseSimpleFloat(int $value, ByteBuffer $buffer, int &$offset) |
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| 124 | { |
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| 125 | switch ($value) { |
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| 126 | case 24: |
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| 127 | $value = $buffer->getByteValue($offset); |
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| 128 | $offset++; |
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| 129 | return self::parseSimpleValue($value); |
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| 130 | |||
| 131 | case 25: |
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| 132 | $floatValue = $buffer->getHalfFloatValue($offset); |
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| 133 | $offset += 2; |
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| 134 | |||
| 135 | return $floatValue; |
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| 136 | |||
| 137 | case 26: |
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| 138 | $floatValue = $buffer->getFloatValue($offset); |
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| 139 | $offset += 4; |
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| 140 | |||
| 141 | return $floatValue; |
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| 142 | |||
| 143 | case 27: |
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| 144 | $floatValue = $buffer->getDoubleValue($offset); |
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| 145 | $offset += 8; |
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| 146 | |||
| 147 | return $floatValue; |
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| 148 | |||
| 149 | case 28: |
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| 150 | case 29: |
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| 151 | case 30: |
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| 152 | throw new WebauthnException(sprintf('Reserved value [%d] used', $value)); |
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| 153 | |||
| 154 | case 31: |
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| 155 | throw new WebauthnException(sprintf('Indefinite value [%d] length is not supported', $value)); |
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| 156 | } |
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| 157 | |||
| 158 | return self::parseSimpleValue($value); |
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| 159 | } |
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| 160 | |||
| 161 | /** |
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| 162 | * Parse simple value |
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| 163 | * @param int $value |
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| 164 | * @return bool|null |
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| 165 | */ |
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| 166 | protected static function parseSimpleValue(int $value): ?bool |
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| 167 | { |
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| 168 | if ($value === 20) { |
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| 169 | return false; |
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| 170 | } |
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| 171 | |||
| 172 | if ($value === 21) { |
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| 173 | return true; |
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| 174 | } |
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| 175 | |||
| 176 | if ($value === 23) { |
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| 177 | return null; |
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| 178 | } |
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| 179 | |||
| 180 | throw new WebauthnException(sprintf('Unsupported simple value [%d]', $value)); |
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| 181 | } |
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| 182 | |||
| 183 | /** |
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| 184 | * Parse the item data |
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| 185 | * @param int $type |
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| 186 | * @param int $value |
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| 187 | * @param ByteBuffer $buffer |
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| 188 | * @param int $offset |
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| 189 | * @return mixed |
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| 190 | */ |
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| 191 | protected static function parseItemData(int $type, int $value, ByteBuffer $buffer, int &$offset) |
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| 192 | { |
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| 193 | switch ($type) { |
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| 194 | case self::CBOR_MAJOR_UNSIGNED_INT: |
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| 195 | return $value; |
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| 196 | |||
| 197 | case self::CBOR_MAJOR_NEGATIVE_INT: |
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| 198 | return -1 - $value; |
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| 199 | |||
| 200 | case self::CBOR_MAJOR_BYTE_STRING: |
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| 201 | $data = $buffer->getBytes($offset, $value); |
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| 202 | $offset += $value; |
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| 203 | return new ByteBuffer($data); // bytes |
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| 204 | |||
| 205 | case self::CBOR_MAJOR_TEXT_STRING: |
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| 206 | $data = $buffer->getBytes($offset, $value); |
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| 207 | $offset += $value; |
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| 208 | return $data; // UTF-8 |
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| 209 | |||
| 210 | case self::CBOR_MAJOR_ARRAY: |
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| 211 | return self::parseArray($buffer, $offset, $value); |
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| 212 | |||
| 213 | case self::CBOR_MAJOR_MAP: |
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| 214 | return self::parseMap($buffer, $offset, $value); |
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| 215 | |||
| 216 | case self::CBOR_MAJOR_TAG: |
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| 217 | return self::parseItem($buffer, $offset); // 1 embedded data item |
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| 218 | } |
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| 219 | |||
| 220 | throw new WebauthnException(sprintf('Unsupported major type [%d]', $type)); |
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| 221 | } |
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| 222 | |||
| 223 | /** |
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| 224 | * Parse an array of values |
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| 225 | * @param ByteBuffer $buffer |
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| 226 | * @param int $offset |
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| 227 | * @param int $count |
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| 228 | * @return array<mixed> |
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| 229 | */ |
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| 230 | protected static function parseArray(ByteBuffer $buffer, int &$offset, int $count): array |
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| 231 | { |
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| 232 | $arr = []; |
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| 233 | for ($i = 0; $i < $count; $i++) { |
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| 234 | $arr[] = self::parseItem($buffer, $offset); |
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| 235 | } |
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| 236 | |||
| 237 | return $arr; |
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| 238 | } |
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| 239 | |||
| 240 | /** |
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| 241 | * Parse map of values |
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| 242 | * @param ByteBuffer $buffer |
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| 243 | * @param int $offset |
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| 244 | * @param int $count |
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| 245 | * @return array<string|int, mixed> |
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| 246 | */ |
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| 247 | protected static function parseMap(ByteBuffer $buffer, int &$offset, int $count): array |
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| 261 | } |
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| 262 | |||
| 263 | /** |
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| 264 | * |
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| 265 | * @param int $value |
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| 266 | * @param ByteBuffer $buffer |
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| 267 | * @param int $offset |
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| 268 | * @return int |
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| 269 | */ |
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| 270 | protected static function extractLength(int $value, ByteBuffer $buffer, int &$offset): int |
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| 303 | } |
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| 304 | } |
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| 305 |
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