wikimedia/mediawiki-core

<?php
/**
 * Check that pages marked as being redirects really are.
 *
 * 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\Revision\SlotRecord;
use MediaWiki\Title\Title;

require_once __DIR__ . '/Maintenance.php';

/**
 * Maintenance script to check that pages marked as being redirects really are.
 *
 * @ingroup Maintenance
 */
class CheckBadRedirects extends Maintenance {
    public function __construct() {
        parent::__construct();
        $this->addDescription( 'Check for bad redirects' );
    }

    public function execute() {
        $this->output( "Fetching redirects...\n" );
        $dbr = $this->getReplicaDB();
        $result = $dbr->newSelectQueryBuilder()
            ->select( [ 'page_namespace', 'page_title', 'page_latest' ] )
            ->from( 'page' )
            ->where( [ 'page_is_redirect' => 1 ] )
            ->caller( __METHOD__ )
            ->fetchResultSet();

        $count = $result->numRows();
        $this->output( "Found $count redirects.\n" .
            "Checking for bad redirects:\n\n" );

        $revLookup = $this->getServiceContainer()->getRevisionLookup();
        foreach ( $result as $row ) {
            $title = Title::makeTitle( $row->page_namespace, $row->page_title );
            $revRecord = $revLookup->getRevisionById( $row->page_latest );
            if ( $revRecord ) {
                $target = $revRecord->getContent( SlotRecord::MAIN )->getRedirectTarget();
                if ( !$target ) {
                    $this->output( $title->getPrefixedText() . "\n" );
                }
            }
        }
        $this->output( "\nDone.\n" );
    }
}

$maintClass = CheckBadRedirects::class;
require_once RUN_MAINTENANCE_IF_MAIN;