lekoala /
silverstripe-encrypt
| Total Complexity | 72 |
| Total Lines | 462 |
| Duplicated Lines | 0 % |
| Changes | 4 | ||
| Bugs | 1 | Features | 0 |
Complex classes like EncryptedDBField 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 EncryptedDBField, and based on these observations, apply Extract Interface, too.
| 1 | <?php |
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| 20 | class EncryptedDBField extends DBComposite |
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| 21 | { |
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| 22 | use HasBaseEncryption; |
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| 23 | |||
| 24 | const LARGE_INDEX_SIZE = 32; |
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| 25 | const SMALL_INDEX_SIZE = 16; |
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| 26 | const VALUE_SUFFIX = "Value"; |
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| 27 | const INDEX_SUFFIX = "BlindIndex"; |
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| 28 | |||
| 29 | /** |
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| 30 | * @config |
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| 31 | * @var int |
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| 32 | */ |
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| 33 | private static $output_size = 15; |
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introduced
by
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| 34 | |||
| 35 | /** |
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| 36 | * @config |
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| 37 | * @var int |
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| 38 | */ |
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| 39 | private static $domain_size = 127; |
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| 40 | |||
| 41 | /** |
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| 42 | * @var array<string,string> |
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| 43 | */ |
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| 44 | private static $composite_db = array( |
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| 45 | "Value" => "Varchar(191)", |
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| 46 | "BlindIndex" => 'Varchar(32)', |
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| 47 | ); |
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| 48 | |||
| 49 | /** |
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| 50 | * Output size is the number of bits (not bytes) of a blind index. |
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| 51 | * Eg: 4 for a 4 digits year |
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| 52 | * Note: the larger the output size, the smaller the index should be |
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| 53 | * @return int |
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| 54 | */ |
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| 55 | public function getOutputSize() |
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| 56 | { |
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| 57 | if (array_key_exists('output_size', $this->options)) { |
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| 58 | $outputSize = $this->options['output_size']; |
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| 59 | } else { |
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| 60 | $outputSize = static::config()->get('output_size'); |
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| 61 | } |
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| 62 | return $outputSize; |
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| 63 | } |
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| 64 | |||
| 65 | /** |
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| 66 | * Input domain is the set of all possible distinct inputs. |
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| 67 | * Eg : 4 digits have 10,000 possible values (10^4). The log (base 2) of 10,000 is 13.2877; you would want to always round up (so 14). |
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| 68 | * @return int |
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| 69 | */ |
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| 70 | public function getDomainSize() |
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| 71 | { |
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| 72 | if (array_key_exists('domain_size', $this->options)) { |
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| 73 | $domainSize = $this->options['domain_size']; |
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| 74 | } else { |
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| 75 | $domainSize = static::config()->get('domain_size'); |
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| 76 | } |
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| 77 | return $domainSize; |
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| 78 | } |
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| 79 | |||
| 80 | /** |
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| 81 | * @param int $default |
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| 82 | * @return int |
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| 83 | */ |
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| 84 | public function getIndexSize($default = null) |
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| 85 | { |
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| 86 | if (array_key_exists('index_size', $this->options)) { |
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| 87 | return $this->options['index_size']; |
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| 88 | } |
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| 89 | if ($default !== null) { |
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| 90 | return $default; |
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| 91 | } |
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| 92 | return self::LARGE_INDEX_SIZE; |
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| 93 | } |
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| 94 | |||
| 95 | /** |
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| 96 | * @return string |
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| 97 | */ |
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| 98 | public function getValueField() |
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| 99 | { |
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| 100 | return $this->getField(self::VALUE_SUFFIX); |
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| 101 | } |
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| 102 | |||
| 103 | /** |
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| 104 | * @param mixed $value |
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| 105 | * @param bool $markChanged |
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| 106 | * @return $this |
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| 107 | */ |
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| 108 | public function setValueField($value, $markChanged = true) |
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| 111 | } |
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| 112 | |||
| 113 | /** |
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| 114 | * @return string |
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| 115 | */ |
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| 116 | public function getBlindIndexField() |
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| 119 | } |
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| 120 | |||
| 121 | /** |
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| 122 | * @param mixed $value |
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| 123 | * @param bool $markChanged |
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| 124 | * @return $this |
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| 125 | */ |
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| 126 | public function setBlindIndexField($value, $markChanged = true) |
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| 129 | } |
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| 130 | |||
| 131 | /** |
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| 132 | * @param CipherSweet $engine |
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| 133 | * @param bool $fashHash |
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| 134 | * @return EncryptedField |
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| 135 | */ |
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| 136 | public function getEncryptedField($engine = null, $fashHash = null) |
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| 154 | } |
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| 155 | |||
| 156 | /** |
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| 157 | * Depending on your version, this may or may not be called |
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| 158 | * When not called, it works thanks to saveInto |
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| 159 | * @link https://github.com/silverstripe/silverstripe-framework/issues/8800 |
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| 160 | * @link https://github.com/silverstripe/silverstripe-framework/pull/10913 |
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| 161 | * @param array<string,mixed> $manipulation |
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| 162 | * @return void |
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| 163 | */ |
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| 164 | public function writeToManipulation(&$manipulation) |
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| 165 | { |
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| 166 | $encryptedField = $this->getEncryptedField(); |
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| 167 | $aad = $this->encryptionAad; |
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| 168 | if ($this->value) { |
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| 169 | $dataForStorage = $encryptedField->prepareForStorage($this->value, $aad); |
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| 170 | $encryptedValue = $this->prepValueForDB($dataForStorage[0]); |
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| 171 | /** @var array<string,string> $blindIndexes */ |
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| 172 | $blindIndexes = $dataForStorage[1]; |
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| 173 | } else { |
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| 174 | $encryptedValue = null; |
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| 175 | $blindIndexes = []; |
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| 176 | } |
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| 177 | |||
| 178 | $manipulation['fields'][$this->name . self::VALUE_SUFFIX] = $encryptedValue; |
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| 179 | foreach ($blindIndexes as $blindIndexName => $blindIndexValue) { |
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| 180 | $iv = $encryptedValue ? $blindIndexValue : null; |
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| 181 | $manipulation['fields'][$blindIndexName] = $iv; |
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| 182 | } |
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| 183 | } |
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| 184 | |||
| 185 | /** |
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| 186 | * @param SQLSelect $query |
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| 187 | * @return void |
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| 188 | */ |
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| 189 | // public function addToQuery(&$query) |
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| 190 | // { |
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| 191 | // parent::addToQuery($query); |
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| 192 | // $query->selectField(sprintf('"%s' . self::VALUE_SUFFIX . '"', $this->name)); |
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| 193 | // $query->selectField(sprintf('"%s' . self::INDEX_SUFFIX . '"', $this->name)); |
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| 194 | // } |
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| 195 | |||
| 196 | /** |
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| 197 | * Return the blind index value to search in the database |
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| 198 | * |
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| 199 | * @param string $val The unencrypted value |
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| 200 | * @param string $indexSuffix The blind index. Defaults to full index |
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| 201 | * @return string |
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| 202 | */ |
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| 203 | public function getSearchValue($val, $indexSuffix = null) |
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| 204 | { |
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| 205 | if (!$this->tableName && $this->record && is_object($this->record)) { |
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| 206 | $this->tableName = DataObject::getSchema()->tableName(get_class($this->record)); |
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| 207 | } |
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| 208 | if (!$this->tableName) { |
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| 209 | throw new Exception("Table name not set for search value. Please set a dataobject."); |
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| 210 | } |
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| 211 | if (!$this->name) { |
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| 212 | throw new Exception("Name not set for search value"); |
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| 213 | } |
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| 214 | if (!$val) { |
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| 215 | throw new Exception("Cannot search an empty value"); |
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| 216 | } |
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| 217 | if ($indexSuffix === null) { |
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| 218 | $indexSuffix = self::INDEX_SUFFIX; |
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| 219 | } |
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| 220 | $field = $this->getEncryptedField(); |
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| 221 | $index = $field->getBlindIndex($val, $this->name . $indexSuffix); |
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| 222 | if (is_array($index)) { |
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| 223 | return $index['value']; |
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| 224 | } |
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| 225 | return $index; |
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| 226 | } |
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| 227 | |||
| 228 | /** |
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| 229 | * Return a ready to use array params for a where clause |
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| 230 | * |
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| 231 | * @param string $val The unencrypted value |
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| 232 | * @param string $indexSuffix The blind index. Defaults to full index |
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| 233 | * @return array<string,string> |
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| 234 | */ |
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| 235 | public function getSearchParams($val, $indexSuffix = null) |
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| 236 | { |
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| 237 | if (!$indexSuffix) { |
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| 238 | $indexSuffix = self::INDEX_SUFFIX; |
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| 239 | } |
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| 240 | $searchValue = $this->getSearchValue($val, $indexSuffix); |
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| 241 | $blindIndexField = $this->name . $indexSuffix; |
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| 242 | return array($blindIndexField . ' = ?' => $searchValue); |
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| 243 | } |
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| 244 | |||
| 245 | /** |
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| 246 | * @param string $val The unencrypted value |
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| 247 | * @param string $indexSuffix The blind index. Defaults to full index |
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| 248 | * @param ?array $where Extra where parameters |
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| 249 | * @return DataList |
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| 250 | */ |
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| 251 | public function fetchDataList($val, $indexSuffix = null, $where = null) |
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| 271 | } |
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| 272 | |||
| 273 | /** |
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| 274 | * @param string $val The unencrypted value |
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| 275 | * @param string $indexSuffix The blind index. Defaults to full index |
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| 276 | * @param string|array|null $ignoreID Allows to ignore one id or a list of ids |
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| 277 | * @param array|null Extra where parameters |
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| 278 | * @return DataObject|false |
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| 279 | */ |
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| 280 | public function fetchRecord($val, $indexSuffix = null, $ignoreID = null, $where = null) |
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| 325 | } |
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| 326 | |||
| 327 | public function setValue($value, $record = null, $markChanged = true) |
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| 328 | { |
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| 329 | $this->setEncryptionAad($record); |
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| 330 | |||
| 331 | // Return early if we keep encrypted value in memory |
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| 332 | if (!EncryptHelper::getAutomaticDecryption()) { |
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| 333 | parent::setValue($value, $record, $markChanged); |
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| 334 | return $this; |
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| 335 | } |
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| 336 | |||
| 337 | if ($markChanged) { |
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| 338 | $this->isChanged = true; |
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| 339 | } |
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| 340 | |||
| 341 | // When given a dataobject, bind this field to that |
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| 342 | if ($record instanceof DataObject) { |
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| 343 | $this->bindTo($record); |
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| 344 | } |
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| 345 | |||
| 346 | // Convert an object to an array |
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| 347 | if ($record && $record instanceof DataObject) { |
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| 348 | $record = $record->getQueriedDatabaseFields(); |
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| 349 | if (!$record) { |
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| 350 | throw new Exception("Could not convert record to array"); |
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| 351 | } |
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| 352 | } |
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| 353 | |||
| 354 | // Set the table name if it was not set earlier |
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| 355 | if (!$this->tableName && $record) { |
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| 356 | $class = is_array($record) && isset($record['ClassName']) ? $record['ClassName'] : get_class($record); |
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| 357 | $this->tableName = DataObject::getSchema()->tableName($class); |
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| 358 | if (!$this->tableName) { |
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| 359 | throw new Exception("Could not get table name from record from " . gettype($record)); |
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| 360 | } |
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| 361 | } |
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| 362 | |||
| 363 | // Value will store the decrypted value |
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| 364 | if ($value instanceof EncryptedDBField) { |
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| 365 | $this->value = $value->getValue(); |
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| 366 | } elseif ($record && isset($record[$this->name . self::VALUE_SUFFIX])) { |
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| 367 | // In that case, the value come from the database and might be encrypted |
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| 368 | $encryptedValue = $record[$this->name . self::VALUE_SUFFIX]; |
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| 369 | $this->value = $this->decryptValue($encryptedValue); |
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| 370 | } elseif (is_array($value)) { |
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| 371 | if (array_key_exists(self::VALUE_SUFFIX, $value)) { |
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| 372 | $this->value = $value; |
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| 373 | } |
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| 374 | } elseif (is_string($value) || !$value) { |
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| 375 | $this->value = $value; |
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| 376 | } else { |
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| 377 | throw new Exception("Unexcepted value of type " . gettype($value)); |
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| 378 | } |
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| 379 | |||
| 380 | if (!$this->value) { |
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| 381 | // Forward changes otherwise old value may get restored from record |
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| 382 | // Can also help if manipulations are not executed properly |
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| 383 | $this->setValueField(null, $markChanged); |
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| 384 | |||
| 385 | // Make sure blind index gets nullified |
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| 386 | $this->setBlindIndexField(null); |
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| 387 | } |
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| 388 | |||
| 389 | return $this; |
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| 390 | } |
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| 391 | |||
| 392 | /** |
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| 393 | * @param array<string,mixed> $options |
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| 394 | * @return string |
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| 395 | */ |
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| 396 | public function Nice($options = array()) |
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| 397 | { |
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| 398 | return $this->getValue(); |
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| 399 | } |
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| 400 | |||
| 401 | /** |
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| 402 | * @return boolean |
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| 403 | */ |
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| 404 | public function exists() |
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| 405 | { |
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| 406 | return strlen($this->value ?? '') > 0; |
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| 407 | } |
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| 408 | |||
| 409 | /** |
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| 410 | * This is called by getChangedFields() to check if a field is changed |
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| 411 | * |
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| 412 | * @return boolean |
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| 413 | */ |
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| 414 | public function isChanged() |
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| 415 | { |
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| 416 | return $this->isChanged; |
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| 417 | } |
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| 418 | |||
| 419 | /** |
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| 420 | * If we pass a DBField to the setField method, it will |
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| 421 | * trigger this method |
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| 422 | * |
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| 423 | * We save encrypted value on sub fields. They will be collected |
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| 424 | * by write() operation by prepareManipulationTable |
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| 425 | * |
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| 426 | * Currently prepareManipulationTable ignores composite fields |
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| 427 | * so we rely on the sub field mechanisms |
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| 428 | * |
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| 429 | * @param DataObject $dataObject |
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| 430 | * @return void |
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| 431 | */ |
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| 432 | public function saveInto($dataObject) |
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| 433 | { |
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| 434 | $encryptedField = $this->getEncryptedField(); |
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| 435 | $aad = $this->encryptionAad; |
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| 436 | if ($this->value) { |
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| 437 | $dataForStorage = $encryptedField->prepareForStorage($this->value, $aad); |
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| 438 | $encryptedValue = $this->prepValueForDB($dataForStorage[0]); |
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| 439 | /** @var array<string,string> $blindIndexes */ |
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| 440 | $blindIndexes = $dataForStorage[1]; |
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| 441 | } else { |
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| 442 | $encryptedValue = null; |
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| 443 | $blindIndexes = []; |
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| 444 | } |
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| 445 | |||
| 446 | // This cause infinite loops |
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| 447 | // $dataObject->setField($this->getName(), $this->value); |
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| 448 | |||
| 449 | // Encrypt value |
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| 450 | $key = $this->getName() . self::VALUE_SUFFIX; |
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| 451 | $dataObject->setField($key, $encryptedValue); |
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| 452 | |||
| 453 | // Build blind indexes |
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| 454 | foreach ($blindIndexes as $blindIndexName => $blindIndexValue) { |
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| 455 | $iv = $this->value ? $blindIndexValue : null; |
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| 456 | $dataObject->setField($blindIndexName, $iv); |
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| 457 | } |
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| 458 | } |
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| 459 | |||
| 460 | /** |
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| 461 | * @param string $title Optional. Localized title of the generated instance |
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| 462 | * @param array<mixed> $params |
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| 463 | * @return FormField |
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| 464 | */ |
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| 465 | public function scaffoldFormField($title = null, $params = null) |
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| 469 | } |
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| 470 | |||
| 471 | /** |
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| 472 | * Returns the string value |
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| 473 | */ |
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| 474 | public function __toString() |
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| 477 | } |
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| 478 | |||
| 479 | public function scalarValueOnly() |
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| 482 | } |
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| 483 | } |
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| 484 |
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