owncloud/core

<?php
/**
 * @author Thomas Müller <thomas.mueller@tmit.eu>
 * @author Vincent Petry <pvince81@owncloud.com>
 *
 * @copyright Copyright (c) 2018, ownCloud GmbH
 * @license AGPL-3.0
 *
 * This code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License, version 3,
 * as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License, version 3,
 * along with this program.  If not, see <http://www.gnu.org/licenses/>
 *
 */

namespace OC\Repair;

use Doctrine\DBAL\Platforms\SqlitePlatform;
use Doctrine\DBAL\Schema\SchemaException;
use Doctrine\DBAL\Schema\SchemaDiff;
use Doctrine\DBAL\Schema\TableDiff;
use Doctrine\DBAL\Schema\ColumnDiff;
use OCP\Migration\IOutput;
use OCP\Migration\IRepairStep;

/**
 * Fixes Sqlite autoincrement by forcing the SQLite table schemas to be
 * altered in order to retrigger SQL schema generation through OCSqlitePlatform.
 */
class SqliteAutoincrement implements IRepairStep {
    /**
     * @var \OC\DB\Connection
     */
    protected $connection;

    /**
     * @param \OC\DB\Connection $connection
     */
    public function __construct($connection) {
        $this->connection = $connection;
    }

    public function getName() {
        return 'Repair SQLite autoincrement';
    }

    /**
     * Fix mime types
     */
    public function run(IOutput $out) {
        if (!$this->connection->getDatabasePlatform() instanceof SqlitePlatform) {
            return;
        }

        $sourceSchema = $this->connection->getSchemaManager()->createSchema();

        $schemaDiff = new SchemaDiff();

        foreach ($sourceSchema->getTables() as $tableSchema) {
            $primaryKey = $tableSchema->getPrimaryKey();
            if (!$primaryKey) {
                continue;
            }

            $columnNames = $primaryKey->getColumns();

            // add a column diff for every primary key column,
            // but do not actually change anything, this will
            // force the generation of SQL statements to alter
            // those tables, which will then trigger the
            // specific SQL code from OCSqlitePlatform
            try {
                $tableDiff = new TableDiff($tableSchema->getName());
                $tableDiff->fromTable = $tableSchema;
                foreach ($columnNames as $columnName) {
                    $columnSchema = $tableSchema->getColumn($columnName);
                    $columnDiff = new ColumnDiff($columnSchema->getName(), $columnSchema);
                    $tableDiff->changedColumns[] = $columnDiff;
                    $schemaDiff->changedTables[] = $tableDiff;
                }
            } catch (SchemaException $e) {
                // ignore
            }
        }

        $this->connection->beginTransaction();
        foreach ($schemaDiff->toSql($this->connection->getDatabasePlatform()) as $sql) {
            $this->connection->query($sql);
        }
        $this->connection->commit();
    }
}