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<?php |
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/** |
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* TechDivision\Import\Utils\ColumnSanitizer |
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* |
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* NOTICE OF LICENSE |
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* |
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* This source file is subject to the Open Software License (OSL 3.0) |
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* that is available through the world-wide-web at this URL: |
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* http://opensource.org/licenses/osl-3.0.php |
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* |
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* PHP version 7 |
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* |
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* @author Team CSI <[email protected]> |
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* @copyright 2020 TechDivision GmbH <[email protected]> |
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* @license http://opensource.org/licenses/osl-3.0.php Open Software License (OSL 3.0) |
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* @link https://github.com/techdivision/import |
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* @link http://www.techdivision.com |
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*/ |
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namespace TechDivision\Import\Utils; |
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/** |
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* Utility class for statement query sanitizing. |
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* |
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* @author Team CSI <[email protected]> |
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* @copyright 2020 TechDivision GmbH <[email protected]> |
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* @license http://opensource.org/licenses/osl-3.0.php Open Software License (OSL 3.0) |
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* @link https://github.com/techdivision/import |
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* @link http://www.techdivision.com |
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*/ |
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class ColumnSanitizer implements SanitizerInterface |
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{ |
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/** |
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* Holds already processed statement column data. |
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* |
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* @var array |
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*/ |
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protected $queryCache = []; |
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/** |
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* @inheritDoc |
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*/ |
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public function execute(array $row, \PDOStatement $statement) |
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{ |
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$allowedColumns = $this->getAllowedColumns($statement); |
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return array_intersect_key($row, $allowedColumns); |
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} |
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/** |
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* Determines allowed columns for current statement. |
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* |
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* @param \PDOStatement $statement |
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* @return array The allowed columns for this statement |
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*/ |
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protected function getAllowedColumns(\PDOStatement $statement): array |
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{ |
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$sql = $statement->queryString; |
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$queryCacheKey = $this->getKey($sql); |
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if (!isset($this->queryCache[$queryCacheKey])) { |
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$statementColumns = $this->extractAllowedColumns($sql); |
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$allowedColumns = array_merge($statementColumns, $this->getProtectedColumns()); |
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$this->queryCache[$queryCacheKey] = array_combine($allowedColumns, $allowedColumns); |
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} |
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return $this->queryCache[$queryCacheKey]; |
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} |
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/** |
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* Calculate internal cache key. |
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* |
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* crc32 is used as performance is more important than cryptographic safety. |
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* |
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* @param string $statement |
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* @return int |
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*/ |
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protected function getKey(string $statement) |
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{ |
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return crc32($statement); |
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} |
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/** |
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* Extract allowed columns from statement |
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* |
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* @param string $sql |
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* @return array |
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*/ |
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protected function extractAllowedColumns(string $sql) |
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{ |
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$matches = []; |
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preg_match_all('/:([^,\n )]*)/', $sql, $matches); |
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return $matches[1]; |
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} |
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/** |
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* Return special column names, that are necessary additionally to statement columns. |
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* |
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* @return array |
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*/ |
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protected function getProtectedColumns() |
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{ |
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return [EntityStatus::MEMBER_NAME]; |
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} |
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} |
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techdivision /
import
