vakata /
asn1
| Total Complexity | 83 |
| Total Lines | 228 |
| Duplicated Lines | 0 % |
| Changes | 5 | ||
| Bugs | 2 | Features | 1 |
Complex classes like Encoder 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 Encoder, and based on these observations, apply Extract Interface, too.
| 1 | <?php |
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| 11 | class Encoder |
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| 12 | { |
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| 13 | /** |
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| 14 | * Encode some data to DER using a mapping array. |
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| 15 | * @param mixed $source the data to convert |
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| 16 | * @param array $mapping rules to convert by (check the example on https://github.com/vakata/asn1) |
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| 17 | * @return mixed raw DER output (base64_encode if needed), false on failure |
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| 18 | */ |
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| 19 | public static function encode($source, $mapping) |
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| 20 | { |
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| 21 | if (isset($mapping['default']) && $source === $mapping['default']) { |
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| 22 | return ''; |
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| 23 | } |
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| 24 | |||
| 25 | $tag = $mapping['tag']; |
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| 26 | if (isset($mapping['raw']) && $mapping['raw']) { |
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| 27 | $value = $source ?? ''; |
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| 28 | } else { |
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| 29 | switch ($tag) { |
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| 30 | case ASN1::TYPE_SET: |
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| 31 | case ASN1::TYPE_SEQUENCE: |
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| 32 | $tag |= 0x20; // set the constructed bit |
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| 33 | $value = ''; |
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| 34 | if (isset($mapping['min']) && isset($mapping['max'])) { |
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| 35 | $child = $mapping['children']; |
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| 36 | foreach ($source as $content) { |
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| 37 | $temp = static::encode($content, $child); |
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| 38 | if ($temp === false) { |
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| 39 | return false; |
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| 40 | } |
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| 41 | $value .= $temp; |
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| 42 | } |
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| 43 | break; |
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| 44 | } |
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| 45 | if (isset($mapping['repeat'])) { |
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| 46 | foreach ($source as $content) { |
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| 47 | $temp = static::encode($content, $mapping['repeat']); |
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| 48 | if ($temp === false) { |
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| 49 | return false; |
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| 50 | } |
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| 51 | $value .= $temp; |
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| 52 | } |
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| 53 | } else { |
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| 54 | foreach ($mapping['children'] as $key => $child) { |
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| 55 | if (!array_key_exists($key, $source)) { |
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| 56 | if (!isset($child['optional'])) { |
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| 57 | return false; |
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| 58 | } |
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| 59 | continue; |
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| 60 | } |
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| 61 | $temp = static::encode($source[$key], $child); |
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| 62 | if ($temp === false) { |
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| 63 | return false; |
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| 64 | } |
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| 65 | if ($temp === '') { |
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| 66 | continue; |
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| 67 | } |
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| 68 | $value .= $temp; |
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| 69 | } |
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| 70 | } |
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| 71 | break; |
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| 72 | case ASN1::TYPE_CHOICE: |
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| 73 | $temp = false; |
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| 74 | foreach ($mapping['children'] as $key => $child) { |
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| 75 | if (!isset($source[$key])) { |
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| 76 | continue; |
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| 77 | } |
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| 78 | $temp = static::encode($source[$key], $child); |
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| 79 | if ($temp === false) { |
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| 80 | return false; |
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| 81 | } |
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| 82 | if ($temp === '') { |
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| 83 | continue; |
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| 84 | } |
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| 85 | } |
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| 86 | return $temp; |
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| 87 | case ASN1::TYPE_INTEGER: |
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| 88 | case ASN1::TYPE_ENUMERATED: |
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| 89 | if (!isset($mapping['map']) && isset($mapping['base']) && $mapping['base'] === 16) { |
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| 90 | if (strlen($source) % 2 == 1) { |
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| 91 | $source = '0' . $source; |
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| 92 | } |
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| 93 | $value = hex2bin($source); |
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| 94 | } else { |
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| 95 | if (!isset($mapping['map'])) { |
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| 96 | $value = ASN1::toBase256($source, isset($mapping['base']) ? $mapping['base'] : 10); |
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| 97 | } else { |
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| 98 | $value = array_search($source, $mapping['map']); |
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| 99 | if ($value === false) { |
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| 100 | return false; |
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| 101 | } |
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| 102 | $value = ASN1::toBase256($value, isset($mapping['base']) ? (int)$mapping['base'] : 10); |
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| 103 | } |
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| 104 | } |
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| 105 | if (!strlen($value)) { |
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| 106 | $value = chr(0); |
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| 107 | } |
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| 108 | break; |
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| 109 | case ASN1::TYPE_UTC_TIME: |
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| 110 | case ASN1::TYPE_GENERALIZED_TIME: |
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| 111 | $format = $mapping['tag'] == ASN1::TYPE_UTC_TIME ? 'y' : 'Y'; |
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| 112 | $format.= 'mdHis'; |
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| 113 | $value = @gmdate($format, strtotime($source)) . 'Z'; |
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| 114 | break; |
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| 115 | case ASN1::TYPE_BIT_STRING: |
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| 116 | if (isset($mapping['map'])) { |
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| 117 | $mcnt = count($mapping['map']); |
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| 118 | $bits = array_fill(0, $mcnt, 0); |
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| 119 | $size = 0; |
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| 120 | for ($i = 0; $i < $mcnt; $i++) { |
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| 121 | if (in_array($mapping['map'][$i], $source)) { |
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| 122 | $bits[$i] = 1; |
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| 123 | $size = $i; |
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| 124 | } |
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| 125 | } |
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| 126 | |||
| 127 | if (isset($mapping['min']) && $mapping['min'] >= 1 && $size < $mapping['min']) { |
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| 128 | $size = $mapping['min'] - 1; |
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| 129 | } |
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| 130 | |||
| 131 | $offset = 8 - (($size + 1) & 7); |
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| 132 | $offset = $offset !== 8 ? $offset : 0; |
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| 133 | |||
| 134 | $value = chr($offset); |
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| 135 | |||
| 136 | for ($i = $size + 1; $i < $mcnt; $i++) { |
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| 137 | unset($bits[$i]); |
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| 138 | } |
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| 139 | |||
| 140 | $bits = implode('', array_pad($bits, $size + $offset + 1, 0)); |
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| 141 | $bytes = explode(' ', rtrim(chunk_split($bits, 8, ' '))); |
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| 142 | foreach ($bytes as $byte) { |
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| 143 | $value.= chr((int)bindec($byte)); |
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| 144 | } |
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| 145 | |||
| 146 | break; |
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| 147 | } |
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| 148 | // default to octet string if no mapping is present |
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| 149 | case ASN1::TYPE_OCTET_STRING: |
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| 150 | $value = base64_decode($source); |
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| 151 | break; |
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| 152 | case ASN1::TYPE_OBJECT_IDENTIFIER: |
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| 153 | if (!isset($source) && $mapping['optional']) { |
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| 154 | return; |
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| 155 | } |
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| 156 | $oid = preg_match('(^(\d+\.?)+$)', $source) ? $source : ASN1::TextToOID($source); |
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| 157 | if (!preg_match('(^(\d+\.?)+$)', $oid)) { |
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| 158 | throw new ASN1Exception('Invalid OID'); |
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| 159 | } |
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| 160 | $parts = explode('.', $oid); |
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| 161 | $value = chr(40 * $parts[0] + $parts[1]); |
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| 162 | $pcnt = count($parts); |
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| 163 | for ($i = 2; $i < $pcnt; $i++) { |
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| 164 | $temp = ''; |
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| 165 | if (!$parts[$i]) { |
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| 166 | $temp = "\0"; |
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| 167 | } else { |
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| 168 | while ($parts[$i]) { |
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| 169 | $temp = chr(0x80 | ($parts[$i] & 0x7F)) . $temp; |
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| 170 | $parts[$i] >>= 7; |
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| 171 | } |
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| 172 | $temp[strlen($temp) - 1] = $temp[strlen($temp) - 1] & chr(0x7F); |
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| 173 | } |
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| 174 | $value.= $temp; |
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| 175 | } |
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| 176 | break; |
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| 177 | case ASN1::TYPE_ANY: |
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| 178 | switch (true) { |
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| 179 | case !isset($source): |
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| 180 | return static::encode(null, array('tag' => ASN1::TYPE_NULL) + $mapping); |
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| 181 | case is_int($source): |
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| 182 | return static::encode($source, array('tag' => ASN1::TYPE_INTEGER) + $mapping); |
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| 183 | case is_float($source): |
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| 184 | return static::encode($source, array('tag' => ASN1::TYPE_REAL) + $mapping); |
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| 185 | case is_bool($source): |
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| 186 | return static::encode($source, array('tag' => ASN1::TYPE_BOOLEAN) + $mapping); |
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| 187 | case is_string($source) && preg_match('(^(\d+\.?)+$)', $source): |
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| 188 | return static::encode($source, array('tag' => ASN1::TYPE_OBJECT_IDENTIFIER) + $mapping); |
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| 189 | default: |
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| 190 | throw new ASN1Exception('Unrecognized type'); |
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| 191 | } |
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| 192 | break; |
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| 193 | case ASN1::TYPE_NULL: |
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| 194 | $value = ''; |
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| 195 | break; |
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| 196 | case ASN1::TYPE_NUMERIC_STRING: |
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| 197 | case ASN1::TYPE_TELETEX_STRING: |
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| 198 | case ASN1::TYPE_PRINTABLE_STRING: |
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| 199 | case ASN1::TYPE_UNIVERSAL_STRING: |
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| 200 | case ASN1::TYPE_UTF8_STRING: |
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| 201 | case ASN1::TYPE_BMP_STRING: |
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| 202 | case ASN1::TYPE_IA5_STRING: |
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| 203 | case ASN1::TYPE_VISIBLE_STRING: |
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| 204 | case ASN1::TYPE_VIDEOTEX_STRING: |
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| 205 | case ASN1::TYPE_GRAPHIC_STRING: |
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| 206 | case ASN1::TYPE_GENERAL_STRING: |
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| 207 | $value = $source; |
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| 208 | break; |
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| 209 | case ASN1::TYPE_BOOLEAN: |
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| 210 | $value = $source ? "\xFF" : "\x00"; |
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| 211 | break; |
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| 212 | default: |
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| 213 | throw new ASN1Exception('Mapping provides no type definition'); |
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| 214 | } |
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| 215 | } |
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| 216 | |||
| 217 | $length = static::length(strlen($value)); |
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| 218 | if (isset($mapping['name'])) { |
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| 219 | if (isset($mapping['implicit']) && $mapping['implicit']) { |
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| 220 | $tag = ((ASN1::CLASS_CONTEXT_SPECIFIC ?? 2) << 6) | (ord($value[0]) & 0x20) | $mapping['name']; |
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| 221 | return chr($tag) . $length . $value; |
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| 222 | } else { |
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| 223 | $value = chr($tag) . $length . $value; |
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| 224 | return chr(((ASN1::CLASS_CONTEXT_SPECIFIC ?? 2) << 6) | 0x20 | $mapping['name']) . |
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| 225 | static::length(strlen($value)) . |
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| 226 | $value; |
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| 227 | } |
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| 228 | } |
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| 229 | return chr($tag) . $length . $value; |
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| 230 | } |
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| 231 | |||
| 232 | protected static function length($length) |
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| 239 | } |
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| 240 | } |
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| 241 |
