lekoala /
silverstripe-encrypt
| Total Complexity | 62 |
| Total Lines | 401 |
| Duplicated Lines | 0 % |
| Changes | 2 | ||
| Bugs | 0 | 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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| 17 | class EncryptedDBField extends DBComposite |
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| 18 | { |
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| 19 | use HasBaseEncryption; |
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| 20 | |||
| 21 | const LARGE_INDEX_SIZE = 32; |
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| 22 | const SMALL_INDEX_SIZE = 16; |
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| 23 | const VALUE_SUFFIX = "Value"; |
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| 24 | const INDEX_SUFFIX = "BlindIndex"; |
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| 25 | |||
| 26 | /** |
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| 27 | * @config |
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| 28 | * @var int |
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| 29 | */ |
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| 30 | private static $output_size = 15; |
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introduced
by
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| 31 | |||
| 32 | /** |
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| 33 | * @config |
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| 34 | * @var int |
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| 35 | */ |
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| 36 | private static $domain_size = 127; |
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| 37 | |||
| 38 | /** |
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| 39 | * @param array |
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| 40 | */ |
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| 41 | private static $composite_db = array( |
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| 42 | "Value" => "Varchar(191)", |
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| 43 | "BlindIndex" => 'Varchar(32)', |
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| 44 | ); |
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| 45 | |||
| 46 | /** |
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| 47 | * Output size is the number of bits (not bytes) of a blind index. |
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| 48 | * Eg: 4 for a 4 digits year |
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| 49 | * Note: the larger the output size, the smaller the index should be |
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| 50 | * @return int |
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| 51 | */ |
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| 52 | public function getOutputSize() |
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| 53 | { |
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| 54 | if (array_key_exists('output_size', $this->options)) { |
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| 55 | $outputSize = $this->options['output_size']; |
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| 56 | } else { |
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| 57 | $outputSize = static::config()->get('output_size'); |
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| 58 | } |
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| 59 | return $outputSize; |
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| 60 | } |
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| 61 | |||
| 62 | /** |
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| 63 | * Input domain is the set of all possible distinct inputs. |
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| 64 | * 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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| 65 | * @return int |
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| 66 | */ |
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| 67 | public function getDomainSize() |
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| 68 | { |
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| 69 | if (array_key_exists('domain_size', $this->options)) { |
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| 70 | $domainSize = $this->options['domain_size']; |
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| 71 | } else { |
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| 72 | $domainSize = static::config()->get('domain_size'); |
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| 73 | } |
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| 74 | return $domainSize; |
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| 75 | } |
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| 76 | |||
| 77 | /** |
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| 78 | * @param int $default |
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| 79 | * @return int |
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| 80 | */ |
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| 81 | public function getIndexSize($default = null) |
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| 82 | { |
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| 83 | if (array_key_exists('index_size', $this->options)) { |
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| 84 | return $this->options['index_size']; |
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| 85 | } |
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| 86 | if ($default) { |
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| 87 | return $default; |
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| 88 | } |
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| 89 | return self::LARGE_INDEX_SIZE; |
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| 90 | } |
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| 91 | |||
| 92 | /** |
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| 93 | * @return string |
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| 94 | */ |
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| 95 | public function getValueField() |
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| 96 | { |
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| 97 | return $this->getField(self::VALUE_SUFFIX); |
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| 98 | } |
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| 99 | |||
| 100 | /** |
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| 101 | * @return $this |
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| 102 | */ |
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| 103 | public function setValueField($value, $markChanged = true) |
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| 106 | } |
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| 107 | |||
| 108 | /** |
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| 109 | * @return string |
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| 110 | */ |
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| 111 | public function getBlindIndexField() |
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| 114 | } |
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| 115 | |||
| 116 | /** |
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| 117 | * @return $this |
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| 118 | */ |
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| 119 | public function setBlindIndexField($value, $markChanged = true) |
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| 122 | } |
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| 123 | |||
| 124 | /** |
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| 125 | * @param CipherSweet $engine |
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| 126 | * @param bool $fashHash |
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| 127 | * @return EncryptedField |
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| 128 | */ |
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| 129 | public function getEncryptedField($engine = null, $fashHash = null) |
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| 130 | { |
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| 131 | if ($engine === null) { |
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| 132 | $engine = EncryptHelper::getCipherSweet(); |
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| 133 | } |
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| 134 | if ($fashHash === null) { |
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| 135 | $fashHash = EncryptHelper::getFashHash(); |
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| 136 | } |
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| 137 | $indexSize = $this->getIndexSize(self::LARGE_INDEX_SIZE); |
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| 138 | // fieldName needs to match exact db name for row rotator to work properly |
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| 139 | $encryptedField = (new EncryptedField($engine, $this->tableName, $this->name . self::VALUE_SUFFIX)) |
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| 140 | ->addBlindIndex(new BlindIndex($this->name . self::INDEX_SUFFIX, [], $indexSize, $fashHash)); |
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| 141 | return $encryptedField; |
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| 142 | } |
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| 143 | |||
| 144 | /** |
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| 145 | * This is not called anymore, we rely on saveInto for now |
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| 146 | * @link https://github.com/silverstripe/silverstripe-framework/issues/8800 |
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| 147 | * @param array $manipulation |
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| 148 | * @return void |
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| 149 | */ |
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| 150 | public function writeToManipulation(&$manipulation) |
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| 151 | { |
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| 152 | $encryptedField = $this->getEncryptedField(); |
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| 153 | $aad = $this->encryptionAad; |
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| 154 | if ($this->value) { |
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| 155 | $dataForStorage = $encryptedField->prepareForStorage($this->value, $aad); |
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| 156 | $encryptedValue = $this->prepValueForDB($dataForStorage[0]); |
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| 157 | $blindIndexes = $dataForStorage[1]; |
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| 158 | } else { |
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| 159 | $encryptedValue = null; |
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| 160 | $blindIndexes = []; |
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| 161 | } |
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| 162 | |||
| 163 | $manipulation['fields'][$this->name . self::VALUE_SUFFIX] = $encryptedValue; |
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| 164 | foreach ($blindIndexes as $blindIndexName => $blindIndexValue) { |
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| 165 | $manipulation['fields'][$blindIndexName] = $blindIndexValue; |
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| 166 | } |
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| 167 | } |
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| 168 | |||
| 169 | /** |
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| 170 | * @param SQLSelect $query |
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| 171 | */ |
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| 172 | public function addToQuery(&$query) |
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| 173 | { |
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| 174 | parent::addToQuery($query); |
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| 175 | $query->selectField(sprintf('"%s' . self::VALUE_SUFFIX . '"', $this->name)); |
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| 176 | $query->selectField(sprintf('"%s' . self::INDEX_SUFFIX . '"', $this->name)); |
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| 177 | } |
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| 178 | |||
| 179 | /** |
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| 180 | * Return the blind index value to search in the database |
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| 181 | * |
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| 182 | * @param string $val The unencrypted value |
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| 183 | * @param string $indexSuffix The blind index. Defaults to full index |
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| 184 | * @return string |
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| 185 | */ |
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| 186 | public function getSearchValue($val, $indexSuffix = null) |
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| 187 | { |
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| 188 | if (!$this->tableName && $this->record) { |
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| 189 | $this->tableName = DataObject::getSchema()->tableName(get_class($this->record)); |
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| 190 | } |
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| 191 | if (!$this->tableName) { |
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| 192 | throw new Exception("Table name not set for search value. Please set a dataobject."); |
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| 193 | } |
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| 194 | if (!$this->name) { |
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| 195 | throw new Exception("Name not set for search value"); |
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| 196 | } |
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| 197 | if ($indexSuffix === null) { |
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| 198 | $indexSuffix = self::INDEX_SUFFIX; |
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| 199 | } |
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| 200 | $field = $this->getEncryptedField(); |
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| 201 | $index = $field->getBlindIndex($val, $this->name . $indexSuffix); |
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| 202 | return $index; |
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| 203 | } |
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| 204 | |||
| 205 | /** |
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| 206 | * Return a ready to use array params for a where clause |
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| 207 | * |
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| 208 | * @param string $val The unencrypted value |
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| 209 | * @param string $indexSuffix The blind index. Defaults to full index |
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| 210 | * @return array |
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| 211 | */ |
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| 212 | public function getSearchParams($val, $indexSuffix = null) |
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| 213 | { |
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| 214 | if (!$indexSuffix) { |
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| 215 | $indexSuffix = self::INDEX_SUFFIX; |
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| 216 | } |
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| 217 | $searchValue = $this->getSearchValue($val, $indexSuffix); |
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| 218 | $blindIndexField = $this->name . $indexSuffix; |
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| 219 | return array($blindIndexField . ' = ?' => $searchValue); |
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| 220 | } |
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| 221 | |||
| 222 | /** |
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| 223 | * @param string $val The unencrypted value |
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| 224 | * @param string $indexSuffix The blind index. Defaults to full index |
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| 225 | * @return DataList |
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| 226 | */ |
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| 227 | public function fetchDataList($val, $indexSuffix = null) |
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| 242 | } |
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| 243 | |||
| 244 | /** |
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| 245 | * @param string $val The unencrypted value |
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| 246 | * @param string $indexSuffix The blind index. Defaults to full index |
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| 247 | * @return DataObject |
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| 248 | */ |
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| 249 | public function fetchRecord($val, $indexSuffix = null) |
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| 271 | } |
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| 272 | |||
| 273 | public function setValue($value, $record = null, $markChanged = true) |
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| 274 | { |
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| 275 | $this->setEncryptionAad($record); |
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| 276 | |||
| 277 | // Return early if we keep encrypted value in memory |
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| 278 | if (!EncryptHelper::getAutomaticDecryption()) { |
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| 279 | parent::setValue($value, $record, $markChanged); |
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| 280 | return $this; |
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| 281 | } |
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| 282 | |||
| 283 | if ($markChanged) { |
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| 284 | $this->isChanged = true; |
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| 285 | } |
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| 286 | |||
| 287 | // When given a dataobject, bind this field to that |
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| 288 | if ($record instanceof DataObject) { |
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| 289 | $this->bindTo($record); |
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| 290 | } |
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| 291 | |||
| 292 | // Convert an object to an array |
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| 293 | if ($record && $record instanceof DataObject) { |
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| 294 | $record = $record->getQueriedDatabaseFields(); |
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| 295 | if (!$record) { |
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| 296 | throw new Exception("Could not convert record to array"); |
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| 297 | } |
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| 298 | } |
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| 299 | |||
| 300 | // Set the table name if it was not set earlier |
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| 301 | if (!$this->tableName && $record) { |
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| 302 | $class = is_array($record) && isset($record['ClassName']) ? $record['ClassName'] : get_class($record); |
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| 303 | $this->tableName = DataObject::getSchema()->tableName($class); |
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| 304 | if (!$this->tableName) { |
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| 305 | throw new Exception("Could not get table name from record from " . gettype($record)); |
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| 306 | } |
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| 307 | } |
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| 308 | |||
| 309 | // Value will store the decrypted value |
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| 310 | if ($value instanceof EncryptedDBField) { |
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| 311 | $this->value = $value->getValue(); |
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| 312 | } elseif ($record && isset($record[$this->name . self::VALUE_SUFFIX])) { |
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| 313 | // In that case, the value come from the database and might be encrypted |
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| 314 | $encryptedValue = $record[$this->name . self::VALUE_SUFFIX]; |
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| 315 | $this->value = $this->decryptValue($encryptedValue); |
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| 316 | } elseif (is_array($value)) { |
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| 317 | if (array_key_exists(self::VALUE_SUFFIX, $value)) { |
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| 318 | $this->value = $value; |
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| 319 | } |
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| 320 | } elseif (is_string($value) || !$value) { |
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| 321 | $this->value = $value; |
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| 322 | } else { |
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| 323 | throw new Exception("Unexcepted value of type " . gettype($value)); |
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| 324 | } |
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| 325 | |||
| 326 | // Forward changes since writeToManipulation are not called |
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| 327 | // $this->setValueField($value, $markChanged); |
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| 328 | |||
| 329 | return $this; |
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| 330 | } |
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| 331 | |||
| 332 | /** |
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| 333 | * @return string |
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| 334 | */ |
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| 335 | public function Nice($options = array()) |
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| 336 | { |
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| 337 | return $this->getValue(); |
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| 338 | } |
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| 339 | |||
| 340 | /** |
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| 341 | * @return boolean |
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| 342 | */ |
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| 343 | public function exists() |
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| 344 | { |
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| 345 | return strlen($this->value ?? '') > 0; |
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| 346 | } |
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| 347 | |||
| 348 | /** |
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| 349 | * This is called by getChangedFields() to check if a field is changed |
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| 350 | * |
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| 351 | * @return boolean |
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| 352 | */ |
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| 353 | public function isChanged() |
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| 354 | { |
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| 355 | return $this->isChanged; |
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| 356 | } |
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| 357 | |||
| 358 | /** |
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| 359 | * If we pass a DBField to the setField method, it will |
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| 360 | * trigger this method |
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| 361 | * |
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| 362 | * We save encrypted value on sub fields. They will be collected |
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| 363 | * by write() operation by prepareManipulationTable |
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| 364 | * |
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| 365 | * Currently prepareManipulationTable ignores composite fields |
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| 366 | * so we rely on the sub field mechanisms |
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| 367 | * |
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| 368 | * @param DataObject $dataObject |
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| 369 | * @return void |
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| 370 | */ |
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| 371 | public function saveInto($dataObject) |
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| 372 | { |
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| 373 | $encryptedField = $this->getEncryptedField(); |
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| 374 | $aad = $this->encryptionAad; |
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| 375 | if ($this->value) { |
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| 376 | $dataForStorage = $encryptedField->prepareForStorage($this->value, $aad); |
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| 377 | $encryptedValue = $this->prepValueForDB($dataForStorage[0]); |
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| 378 | $blindIndexes = $dataForStorage[1]; |
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| 379 | } else { |
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| 380 | $encryptedValue = null; |
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| 381 | $blindIndexes = []; |
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| 382 | } |
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| 383 | |||
| 384 | // This cause infinite loops |
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| 385 | // $dataObject->setField($this->getName(), $this->value); |
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| 386 | |||
| 387 | // Encrypt value |
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| 388 | $key = $this->getName() . self::VALUE_SUFFIX; |
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| 389 | $dataObject->setField($key, $encryptedValue); |
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| 390 | |||
| 391 | // Build blind indexes |
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| 392 | foreach ($blindIndexes as $blindIndexName => $blindIndexValue) { |
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| 393 | $dataObject->setField($blindIndexName, $blindIndexValue); |
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| 394 | } |
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| 395 | } |
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| 396 | |||
| 397 | /** |
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| 398 | * @param string $title Optional. Localized title of the generated instance |
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| 399 | * @return FormField |
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| 400 | */ |
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| 401 | public function scaffoldFormField($title = null, $params = null) |
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| 405 | } |
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| 406 | |||
| 407 | /** |
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| 408 | * Returns the string value |
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| 409 | */ |
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| 410 | public function __toString() |
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| 413 | } |
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| 414 | |||
| 415 | public function scalarValueOnly() |
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| 418 | } |
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| 419 | } |
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| 420 |
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