<?php
/**
 * Reset the user_token for all users on the wiki. Useful if you believe
 * that your user table was acidentally leaked to an external source.
 *
 * 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
 * @author Daniel Friesen <mediawiki@danielfriesen.name>
 * @author Chris Steipp <csteipp@wikimedia.org>
 */

require_once __DIR__ . '/Maintenance.php';

/**
 * Maintenance script to reset the user_token for all users on the wiki.
 *
 * @ingroup Maintenance
 */
class ResetUserTokens extends Maintenance {
	public function __construct() {
		parent::__construct();
		$this->mDescription =
			"Reset the user_token of all users on the wiki. Note that this may log some of them out.";
		$this->addOption( 'nowarn', "Hides the 5 seconds warning", false, false );
		$this->addOption(
			'nulls',
			'Only reset tokens that are currently null (string of \x00\'s)',
			false,
			false
		);
		$this->setBatchSize( 1000 );
	}

	public function execute() {
		$this->nullsOnly = $this->getOption( 'nulls' );

		if ( !$this->getOption( 'nowarn' ) ) {
			if ( $this->nullsOnly ) {
				$this->output( "The script is about to reset the user_token "
					. "for USERS WITH NULL TOKENS in the database.\n" );
			} else {
				$this->output( "The script is about to reset the user_token for ALL USERS in the database.\n" );
				$this->output( "This may log some of them out and is not necessary unless you believe your\n" );
				$this->output( "user table has been compromised.\n" );
			}
			$this->output( "\n" );
			$this->output( "Abort with control-c in the next five seconds "
				. "(skip this countdown with --nowarn) ... " );
			wfCountDown( 5 );
		}

		// We list user by user_id from one of the slave database
		$dbr = wfGetDB( DB_SLAVE );

		$where = array();
		if ( $this->nullsOnly ) {
			// Have to build this by hand, because \ is escaped in helper functions
			$where = array( 'user_token = \'' . str_repeat( '\0', 32 ) . '\'' );
		}

		$maxid = $dbr->selectField( 'user', 'MAX(user_id)', array(), __METHOD__ );

		$min = 0;
		$max = $this->mBatchSize;

		do {
			$result = $dbr->select( 'user',
				array( 'user_id' ),
				array_merge(
					$where,
					array( 'user_id > ' . $dbr->addQuotes( $min ),
						'user_id <= ' . $dbr->addQuotes( $max )
					)
				),
				__METHOD__
			);

			foreach ( $result as $user ) {
				$this->updateUser( $user->user_id );
			}

			$min = $max;
			$max = $min + $this->mBatchSize;

			wfWaitForSlaves();
		} while ( $min <= $maxid );
	}

	private function updateUser( $userid ) {
		$user = User::newFromId( $userid );
		$username = $user->getName();
		$this->output( 'Resetting user_token for "' . $username . '": ' );
		// Change value
		$user->setToken();
		$user->saveSettings();
		$this->output( " OK\n" );
	}
}

$maintClass = "ResetUserTokens";
require_once RUN_MAINTENANCE_IF_MAIN;
