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<?php |
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namespace LeKoala\Encrypt; |
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use SilverStripe\Forms\HiddenField; |
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use ParagonIE\CipherSweet\JsonFieldMap; |
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use ParagonIE\CipherSweet\EncryptedJsonField; |
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/** |
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* A simple extension over EncryptedDBText that supports json |
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* as a datastructure |
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* The data is stored in a text field |
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* |
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* If you want to access array stuff, you need to use |
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* $model->dbObject('myField')->toArray() or any other method |
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* |
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* This field is a great way to store serialized encrypted data |
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*/ |
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class EncryptedDBJson extends EncryptedDBText |
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{ |
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/** |
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* @return string |
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*/ |
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public function getJsonMap() |
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{ |
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if (array_key_exists('map', $this->options)) { |
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return $this->options['map']; |
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} |
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return null; |
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} |
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/** |
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* We cannot search on json fields |
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* |
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* @param string $title |
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* @return HiddenField |
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*/ |
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public function scaffoldSearchField($title = null) |
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{ |
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return HiddenField::create($this->getName()); |
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} |
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/** |
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* Json data is not easily displayed |
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* |
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* @param string $title |
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* @param string $params |
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* @return HiddenField |
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*/ |
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public function scaffoldFormField($title = null, $params = null) |
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{ |
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return HiddenField::create($this->getName()); |
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} |
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/** |
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* @return mixed |
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*/ |
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public function decode() |
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{ |
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if (!$this->value) { |
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return false; |
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} |
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return json_decode($this->value); |
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} |
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/** |
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* @return array |
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*/ |
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public function decodeArray() |
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{ |
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if (!$this->value) { |
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return []; |
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} |
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return json_decode($this->value, JSON_OBJECT_AS_ARRAY); |
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} |
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/** |
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* @return array |
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*/ |
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public function toArray() |
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{ |
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return $this->decodeArray(); |
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} |
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/** |
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* @return string |
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*/ |
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public function pretty() |
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{ |
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return json_encode(json_decode($this->value), JSON_PRETTY_PRINT); |
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} |
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/** |
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* @inheritDoc |
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*/ |
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public function saveInto($dataObject) |
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{ |
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if ($this->value && is_array($this->value)) { |
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$this->value = json_encode($this->value); |
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} |
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parent::saveInto($dataObject); |
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} |
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/** |
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* Add a value |
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* |
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* @link https://stackoverflow.com/questions/7851590/array-set-value-using-dot-notation |
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* @param string|array $key |
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* @param string $value |
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* @return $this |
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*/ |
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public function addValue($key, $value) |
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{ |
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$currentValue = $this->decodeArray(); |
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if (!is_array($key)) { |
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$key = [$key]; |
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} |
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$arr = &$currentValue; |
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foreach ($key as $idx) { |
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if (!isset($arr[$idx])) { |
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$arr[$idx] = []; |
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} |
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$arr = &$arr[$idx]; |
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} |
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$arr = $value; |
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return $this->setValue($currentValue); |
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} |
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/** |
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* Internally, the value is always a json string |
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* |
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* @param mixed $value |
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* @param DataObject $record |
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* @param boolean $markChanged |
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* @return $this |
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*/ |
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public function setValue($value, $record = null, $markChanged = true) |
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{ |
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$this->setEncryptionAad($record); |
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// Not supported, we need decrypted values for methods to work properly |
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// Return early if we keep encrypted value in memory |
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// if (!EncryptHelper::getAutomaticDecryption()) { |
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// $this->value = $value; |
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// return $this; |
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// } |
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// Decrypt first if needed |
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if ($this->getJsonMap() && $value && is_string($value)) { |
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if (EncryptHelper::isJsonEncrypted($value)) { |
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$aad = $this->encryptionAad; |
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$value = json_encode($this->getEncryptedJsonField()->decryptJson($value, $aad)); |
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} |
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} |
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// Internally, we use a string |
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if (is_array($value)) { |
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$value = json_encode($value); |
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} |
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return parent::setValue($value, $record, $markChanged); |
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} |
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/** |
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* @inheritDoc |
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*/ |
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public function prepValueForDB($value) |
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{ |
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// We need an array to encrypt |
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if ($this->getJsonMap() && $value && is_string($value)) { |
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$value = $this->toArray(); |
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} |
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if (is_array($value)) { |
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if ($this->getJsonMap()) { |
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$aad = $this->encryptionAad; |
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$value = $this->getEncryptedJsonField()->encryptJson($value, $aad); |
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return $value; // return early |
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} else { |
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$value = json_encode($value); |
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} |
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} |
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return parent::prepValueForDB($value); |
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} |
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/** |
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* We return false because we can accept array and convert it to string |
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* @return boolean |
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*/ |
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public function scalarValueOnly() |
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{ |
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return false; |
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} |
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/** |
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* @param CipherSweet $engine |
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* @param JsonFieldMap $map |
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* @return EncryptedJsonField |
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*/ |
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public function getEncryptedJsonField($engine = null, $map = null) |
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{ |
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if ($engine === null) { |
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$engine = EncryptHelper::getCipherSweet(); |
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} |
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if ($map === null) { |
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$mapString = $this->getJsonMap(); |
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$map = JsonFieldMap::fromString($mapString); |
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} |
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$encryptedField = EncryptedJsonField::create($engine, $map, $this->tableName, $this->name); |
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return $encryptedField; |
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} |
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} |
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