wikimedia/mediawiki-core

<?php
/**
 * Delete self-references to $wgServer from the externallinks table.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 * http://www.gnu.org/copyleft/gpl.html
 *
 * @file
 * @ingroup Maintenance
 */

use MediaWiki\ExternalLinks\LinkFilter;
use MediaWiki\MainConfigNames;

// @codeCoverageIgnoreStart
require_once __DIR__ . '/Maintenance.php';
// @codeCoverageIgnoreEnd

/**
 * Maintenance script that deletes self-references to $wgServer
 * from the externallinks table.
 *
 * @ingroup Maintenance
 */
class DeleteSelfExternals extends Maintenance {
    public function __construct() {
        parent::__construct();
        $this->addDescription( 'Delete self-references to $wgServer from externallinks' );
        $this->setBatchSize( 1000 );
    }

    public function execute() {
        // Extract the host and scheme from $wgServer
        $server = $this->getConfig()->get( MainConfigNames::Server );
        $bits = $this->getServiceContainer()->getUrlUtils()->parse( $server );
        if ( !$bits ) {
            $this->fatalError( 'Could not parse $wgServer' );
        }

        $this->output( "Deleting self externals from $server\n" );
        $db = $this->getPrimaryDB();

        // If it's protocol-relative, we need to do both http and https.
        // Otherwise, just do the specified scheme.
        $host = $bits['host'];
        if ( isset( $bits['port'] ) ) {
            $host .= ':' . $bits['port'];
        }
        if ( $bits['scheme'] != '' ) {
            $conds = [ LinkFilter::getQueryConditions( $host, [ 'protocol' => $bits['scheme'] . '://' ] ) ];
        } else {
            $conds = [
                LinkFilter::getQueryConditions( $host, [ 'protocol' => 'http://' ] ),
                LinkFilter::getQueryConditions( $host, [ 'protocol' => 'https://' ] ),
            ];
        }

        // Convert the array of $conds into an IExpression object for use in the DELETE query
        // The use of array_filter is just there for a sanity check, as LinkFilter::getQueryConditions
        // only returns false if the host was invalid (we have already validated this above).
        $conds = array_map( static function ( $cond ) use ( $db ) {
            return $db->andExpr( $cond );
        }, array_filter( $conds ) );
        $domainExpr = $db->orExpr( $conds );

        $totalRows = 0;
        $batchStart = 0;
        $batchEnd = $batchStart + $this->getBatchSize();
        do {
            $this->output( "Deleting self-externals with el_id $batchStart to $batchEnd\n" );

            $db->newDeleteQueryBuilder()
                ->deleteFrom( 'externallinks' )
                ->where( $domainExpr )
                ->andWhere( $db->expr( 'el_id', '>', $batchStart ) )
                ->andWhere( $db->expr( 'el_id', '<=', $batchEnd ) )
                ->caller( __METHOD__ )
                ->execute();
            $rowsDeletedInThisBatch = $db->affectedRows();
            $totalRows += $rowsDeletedInThisBatch;

            $batchStart += $this->getBatchSize();
            $batchEnd += $this->getBatchSize();
            $this->waitForReplication();
        } while ( $rowsDeletedInThisBatch );

        $this->output( "done; deleted $totalRows rows\n" );
    }
}

// @codeCoverageIgnoreStart
$maintClass = DeleteSelfExternals::class;
require_once RUN_MAINTENANCE_IF_MAIN;
// @codeCoverageIgnoreEnd