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| 1 | <?php |
| 2 | |
| 3 | declare(strict_types=1); |
| 4 | |
| 5 | /** @license For full copyright and license information, please see the LICENSE.md file. */ |
| 6 | |
| 7 | namespace App\Core\Audit\Application\Service; |
| 8 | |
| 9 | defined('AMMONLY_APP') || exit('Direct script access is forbidden.'); |
| 10 | |
| 11 | use PDO; |
| 12 | |
| 13 | /** |
| 14 | * Audit Log Retention and Pruning Service. |
| 15 | * |
| 16 | * Implements NIST SP 800-53 AU-4 (Audit Storage Capacity and Retention Management) |
| 17 | * by securely purging expired audit logs in non-locking batches. |
| 18 | * |
| 19 | * @package App\Core\Audit\Application\Service |
| 20 | */ |
| 21 | readonly class AuditRetentionService |
| 22 | { |
| 23 | /** |
| 24 | * Date format for SQL timestamp comparisons. |
| 25 | */ |
| 26 | private const string DATE_FORMAT = 'Y-m-d H:i:s'; |
| 27 | |
| 28 | /** |
| 29 | * AuditRetentionService constructor. |
| 30 | * |
| 31 | * @param PDO $pdo Database connection. |
| 32 | * @param string $prefix Table prefix. |
| 33 | */ |
| 34 | public function __construct( |
| 35 | private PDO $pdo, |
| 36 | private string $prefix = 'a_', |
| 37 | ) { |
| 38 | } |
| 39 | |
| 40 | /** |
| 41 | * Prunes expired audit, security, and auth logs according to retention policies. |
| 42 | * |
| 43 | * @param int $auditRetentionDays Retention days for CRUD audit tables. |
| 44 | * @param int $securityRetentionDays Retention days for security alert logs. |
| 45 | * @param int $authRetentionDays Retention days for user auth logs. |
| 46 | * @return array<string, int> Map of table name to number of pruned records. |
| 47 | */ |
| 48 | public function pruneExpiredLogs( |
| 49 | int $auditRetentionDays = 180, |
| 50 | int $securityRetentionDays = 365, |
| 51 | int $authRetentionDays = 90 |
| 52 | ): array { |
| 53 | $auditCutoff = date(self::DATE_FORMAT, strtotime("-{$auditRetentionDays} days")); |
| 54 | $securityCutoff = date(self::DATE_FORMAT, strtotime("-{$securityRetentionDays} days")); |
| 55 | $authCutoff = date(self::DATE_FORMAT, strtotime("-{$authRetentionDays} days")); |
| 56 | |
| 57 | $pruned = []; |
| 58 | |
| 59 | $auditTables = [ |
| 60 | 'logs_audit_create_records', |
| 61 | 'logs_audit_read_records', |
| 62 | 'logs_audit_update_records', |
| 63 | 'logs_audit_delete_records', |
| 64 | ]; |
| 65 | |
| 66 | foreach ($auditTables as $table) { |
| 67 | $pruned[$table] = $this->pruneTable($table, $auditCutoff); |
| 68 | } |
| 69 | |
| 70 | $pruned['logs_security_records'] = $this->pruneTable('logs_security_records', $securityCutoff); |
| 71 | $pruned['logs_user_auth_records'] = $this->pruneTable('logs_user_auth_records', $authCutoff); |
| 72 | |
| 73 | return $pruned; |
| 74 | } |
| 75 | |
| 76 | /** |
| 77 | * Prunes rows in a given table older than cutoff date. |
| 78 | * |
| 79 | * @param string $table Unprefixed table name. |
| 80 | * @param string $cutoffDate ISO-8601 / MySQL datetime string. |
| 81 | * @return int Total deleted rows. |
| 82 | */ |
| 83 | private function pruneTable(string $table, string $cutoffDate): int |
| 84 | { |
| 85 | $fullTable = $this->prefix . $table; |
| 86 | $totalDeleted = 0; |
| 87 | $batchSize = 1000; |
| 88 | |
| 89 | try { |
| 90 | $isSqlite = $this->pdo->getAttribute(PDO::ATTR_DRIVER_NAME) === 'sqlite'; |
| 91 | $sql = $isSqlite |
| 92 | ? "DELETE FROM `{$fullTable}` WHERE `created_at` < :cutoff" |
| 93 | : "DELETE FROM `{$fullTable}` WHERE `created_at` < :cutoff LIMIT {$batchSize}"; |
| 94 | |
| 95 | do { |
| 96 | $stmt = $this->pdo->prepare($sql); |
| 97 | $stmt->execute([':cutoff' => $cutoffDate]); |
| 98 | $deleted = $stmt->rowCount(); |
| 99 | $totalDeleted += $deleted; |
| 100 | } while (!$isSqlite && $deleted === $batchSize); |
| 101 | } catch (\Throwable) { |
| 102 | // Failsafe execution: do not interrupt runtime if table does not exist |
| 103 | } |
| 104 | |
| 105 | return $totalDeleted; |
| 106 | } |
| 107 | } |