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<?php
declare(strict_types=1);
/**
* SPDX-FileCopyrightText: 2022 Nextcloud GmbH and Nextcloud contributors
* SPDX-License-Identifier: AGPL-3.0-or-later
*/
namespace OCA\User_LDAP\Migration;
use Closure;
use OCP\DB\ISchemaWrapper;
use OCP\DB\QueryBuilder\IQueryBuilder;
use OCP\IDBConnection;
use OCP\Migration\IOutput;
use OCP\Migration\SimpleMigrationStep;
class Version1141Date20220323143801 extends SimpleMigrationStep {
private IDBConnection $dbc;
public function __construct(IDBConnection $dbc) {
$this->dbc = $dbc;
}
/**
* @param IOutput $output
* @param Closure $schemaClosure The `\Closure` returns a `ISchemaWrapper`
* @param array $options
*/
public function preSchemaChange(IOutput $output, Closure $schemaClosure, array $options): void {
foreach (['ldap_user_mapping', 'ldap_group_mapping'] as $tableName) {
$qb = $this->dbc->getQueryBuilder();
$qb->select('ldap_dn')
->from($tableName)
->where($qb->expr()->gt($qb->func()->octetLength('ldap_dn'), $qb->createNamedParameter('4000'), IQueryBuilder::PARAM_INT));
$dnsTooLong = [];
$result = $qb->executeQuery();
while (($dn = $result->fetchOne()) !== false) {
$dnsTooLong[] = $dn;
}
$result->closeCursor();
$this->shortenDNs($dnsTooLong, $tableName);
}
}
protected function shortenDNs(array $dns, string $table): void {
$qb = $this->dbc->getQueryBuilder();
$qb->update($table)
->set('ldap_dn', $qb->createParameter('shortenedDn'))
->where($qb->expr()->eq('ldap_dn', $qb->createParameter('originalDn')));
$pageSize = 1000;
$page = 0;
do {
$subset = array_slice($dns, $page * $pageSize, $pageSize);
try {
$this->dbc->beginTransaction();
foreach ($subset as $dn) {
$shortenedDN = mb_substr($dn, 0, 4000);
$qb->setParameter('shortenedDn', $shortenedDN);
$qb->setParameter('originalDn', $dn);
$qb->executeStatement();
}
$this->dbc->commit();
} catch (\Throwable $t) {
$this->dbc->rollBack();
throw $t;
}
$page++;
} while (count($subset) === $pageSize);
}
/**
* @param IOutput $output
* @param Closure $schemaClosure The `\Closure` returns a `ISchemaWrapper`
* @param array $options
* @return null|ISchemaWrapper
*/
public function changeSchema(IOutput $output, Closure $schemaClosure, array $options): ?ISchemaWrapper {
/** @var ISchemaWrapper $schema */
$schema = $schemaClosure();
foreach (['ldap_user_mapping', 'ldap_group_mapping'] as $tableName) {
$table = $schema->getTable($tableName);
$column = $table->getColumn('ldap_dn');
if ($column->getLength() > 4000) {
$column->setLength(4000);
}
}
return $schema;
}
}
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