Move remaining LoadBalancer classes to Rdbms

[mediawiki.git] / includes / api / ApiQueryRecentChanges.php

<?php
/**
 *
 *
 * Created on Oct 19, 2006
 *
 * Copyright © 2006 Yuri Astrakhan "<Firstname><Lastname>@gmail.com"
 *
 * 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
 */

/**
 * A query action to enumerate the recent changes that were done to the wiki.
 * Various filters are supported.
 *
 * @ingroup API
 */
class ApiQueryRecentChanges extends ApiQueryGeneratorBase {

        public function __construct( ApiQuery $query, $moduleName ) {
                parent::__construct( $query, $moduleName, 'rc' );
        }

        private $fld_comment = false, $fld_parsedcomment = false, $fld_user = false, $fld_userid = false,
                $fld_flags = false, $fld_timestamp = false, $fld_title = false, $fld_ids = false,
                $fld_sizes = false, $fld_redirect = false, $fld_patrolled = false, $fld_loginfo = false,
                $fld_tags = false, $fld_sha1 = false, $token = [];

        private $tokenFunctions;

        /**
         * Get an array mapping token names to their handler functions.
         * The prototype for a token function is func($pageid, $title, $rc)
         * it should return a token or false (permission denied)
         * @deprecated since 1.24
         * @return array [ tokenname => function ]
         */
        protected function getTokenFunctions() {
                // Don't call the hooks twice
                if ( isset( $this->tokenFunctions ) ) {
                        return $this->tokenFunctions;
                }

                // If we're in a mode that breaks the same-origin policy, no tokens can
                // be obtained
                if ( $this->lacksSameOriginSecurity() ) {
                        return [];
                }

                $this->tokenFunctions = [
                        'patrol' => [ 'ApiQueryRecentChanges', 'getPatrolToken' ]
                ];
                Hooks::run( 'APIQueryRecentChangesTokens', [ &$this->tokenFunctions ] );

                return $this->tokenFunctions;
        }

        /**
         * @deprecated since 1.24
         * @param int $pageid
         * @param Title $title
         * @param RecentChange|null $rc
         * @return bool|string
         */
        public static function getPatrolToken( $pageid, $title, $rc = null ) {
                global $wgUser;

                $validTokenUser = false;

                if ( $rc ) {
                        if ( ( $wgUser->useRCPatrol() && $rc->getAttribute( 'rc_type' ) == RC_EDIT ) ||
                                ( $wgUser->useNPPatrol() && $rc->getAttribute( 'rc_type' ) == RC_NEW )
                        ) {
                                $validTokenUser = true;
                        }
                } elseif ( $wgUser->useRCPatrol() || $wgUser->useNPPatrol() ) {
                        $validTokenUser = true;
                }

                if ( $validTokenUser ) {
                        // The patrol token is always the same, let's exploit that
                        static $cachedPatrolToken = null;

                        if ( is_null( $cachedPatrolToken ) ) {
                                $cachedPatrolToken = $wgUser->getEditToken( 'patrol' );
                        }

                        return $cachedPatrolToken;
                }

                return false;
        }

        /**
         * Sets internal state to include the desired properties in the output.
         * @param array $prop Associative array of properties, only keys are used here
         */
        public function initProperties( $prop ) {
                $this->fld_comment = isset( $prop['comment'] );
                $this->fld_parsedcomment = isset( $prop['parsedcomment'] );
                $this->fld_user = isset( $prop['user'] );
                $this->fld_userid = isset( $prop['userid'] );
                $this->fld_flags = isset( $prop['flags'] );
                $this->fld_timestamp = isset( $prop['timestamp'] );
                $this->fld_title = isset( $prop['title'] );
                $this->fld_ids = isset( $prop['ids'] );
                $this->fld_sizes = isset( $prop['sizes'] );
                $this->fld_redirect = isset( $prop['redirect'] );
                $this->fld_patrolled = isset( $prop['patrolled'] );
                $this->fld_loginfo = isset( $prop['loginfo'] );
                $this->fld_tags = isset( $prop['tags'] );
                $this->fld_sha1 = isset( $prop['sha1'] );
        }

        public function execute() {
                $this->run();
        }

        public function executeGenerator( $resultPageSet ) {
                $this->run( $resultPageSet );
        }

        /**
         * Generates and outputs the result of this query based upon the provided parameters.
         *
         * @param ApiPageSet $resultPageSet
         */
        public function run( $resultPageSet = null ) {
                $user = $this->getUser();
                /* Get the parameters of the request. */
                $params = $this->extractRequestParams();

                /* Build our basic query. Namely, something along the lines of:
                 * SELECT * FROM recentchanges WHERE rc_timestamp > $start
                 *              AND rc_timestamp < $end AND rc_namespace = $namespace
                 */
                $this->addTables( 'recentchanges' );
                $this->addTimestampWhereRange( 'rc_timestamp', $params['dir'], $params['start'], $params['end'] );

                if ( !is_null( $params['continue'] ) ) {
                        $cont = explode( '|', $params['continue'] );
                        $this->dieContinueUsageIf( count( $cont ) != 2 );
                        $db = $this->getDB();
                        $timestamp = $db->addQuotes( $db->timestamp( $cont[0] ) );
                        $id = intval( $cont[1] );
                        $this->dieContinueUsageIf( $id != $cont[1] );
                        $op = $params['dir'] === 'older' ? '<' : '>';
                        $this->addWhere(
                                "rc_timestamp $op $timestamp OR " .
                                "(rc_timestamp = $timestamp AND " .
                                "rc_id $op= $id)"
                        );
                }

                $order = $params['dir'] === 'older' ? 'DESC' : 'ASC';
                $this->addOption( 'ORDER BY', [
                        "rc_timestamp $order",
                        "rc_id $order",
                ] );

                $this->addWhereFld( 'rc_namespace', $params['namespace'] );

                if ( !is_null( $params['type'] ) ) {
                        try {
                                $this->addWhereFld( 'rc_type', RecentChange::parseToRCType( $params['type'] ) );
                        } catch ( Exception $e ) {
                                ApiBase::dieDebug( __METHOD__, $e->getMessage() );
                        }
                }

                if ( !is_null( $params['show'] ) ) {
                        $show = array_flip( $params['show'] );

                        /* Check for conflicting parameters. */
                        if ( ( isset( $show['minor'] ) && isset( $show['!minor'] ) )
                                || ( isset( $show['bot'] ) && isset( $show['!bot'] ) )
                                || ( isset( $show['anon'] ) && isset( $show['!anon'] ) )
                                || ( isset( $show['redirect'] ) && isset( $show['!redirect'] ) )
                                || ( isset( $show['patrolled'] ) && isset( $show['!patrolled'] ) )
                                || ( isset( $show['patrolled'] ) && isset( $show['unpatrolled'] ) )
                                || ( isset( $show['!patrolled'] ) && isset( $show['unpatrolled'] ) )
                        ) {
                                $this->dieWithError( 'apierror-show' );
                        }

                        // Check permissions
                        if ( isset( $show['patrolled'] )
                                || isset( $show['!patrolled'] )
                                || isset( $show['unpatrolled'] )
                        ) {
                                if ( !$user->useRCPatrol() && !$user->useNPPatrol() ) {
                                        $this->dieWithError( 'apierror-permissiondenied-patrolflag', 'permissiondenied' );
                                }
                        }

                        /* Add additional conditions to query depending upon parameters. */
                        $this->addWhereIf( 'rc_minor = 0', isset( $show['!minor'] ) );
                        $this->addWhereIf( 'rc_minor != 0', isset( $show['minor'] ) );
                        $this->addWhereIf( 'rc_bot = 0', isset( $show['!bot'] ) );
                        $this->addWhereIf( 'rc_bot != 0', isset( $show['bot'] ) );
                        $this->addWhereIf( 'rc_user = 0', isset( $show['anon'] ) );
                        $this->addWhereIf( 'rc_user != 0', isset( $show['!anon'] ) );
                        $this->addWhereIf( 'rc_patrolled = 0', isset( $show['!patrolled'] ) );
                        $this->addWhereIf( 'rc_patrolled != 0', isset( $show['patrolled'] ) );
                        $this->addWhereIf( 'page_is_redirect = 1', isset( $show['redirect'] ) );

                        if ( isset( $show['unpatrolled'] ) ) {
                                // See ChangesList::isUnpatrolled
                                if ( $user->useRCPatrol() ) {
                                        $this->addWhere( 'rc_patrolled = 0' );
                                } elseif ( $user->useNPPatrol() ) {
                                        $this->addWhere( 'rc_patrolled = 0' );
                                        $this->addWhereFld( 'rc_type', RC_NEW );
                                }
                        }

                        // Don't throw log entries out the window here
                        $this->addWhereIf(
                                'page_is_redirect = 0 OR page_is_redirect IS NULL',
                                isset( $show['!redirect'] )
                        );
                }

                $this->requireMaxOneParameter( $params, 'user', 'excludeuser' );

                if ( !is_null( $params['user'] ) ) {
                        $this->addWhereFld( 'rc_user_text', $params['user'] );
                }

                if ( !is_null( $params['excludeuser'] ) ) {
                        // We don't use the rc_user_text index here because
                        // * it would require us to sort by rc_user_text before rc_timestamp
                        // * the != condition doesn't throw out too many rows anyway
                        $this->addWhere( 'rc_user_text != ' . $this->getDB()->addQuotes( $params['excludeuser'] ) );
                }

                /* Add the fields we're concerned with to our query. */
                $this->addFields( [
                        'rc_id',
                        'rc_timestamp',
                        'rc_namespace',
                        'rc_title',
                        'rc_cur_id',
                        'rc_type',
                        'rc_deleted'
                ] );

                $showRedirects = false;
                /* Determine what properties we need to display. */
                if ( !is_null( $params['prop'] ) ) {
                        $prop = array_flip( $params['prop'] );

                        /* Set up internal members based upon params. */
                        $this->initProperties( $prop );

                        if ( $this->fld_patrolled && !$user->useRCPatrol() && !$user->useNPPatrol() ) {
                                $this->dieWithError( 'apierror-permissiondenied-patrolflag', 'permissiondenied' );
                        }

                        /* Add fields to our query if they are specified as a needed parameter. */
                        $this->addFieldsIf( [ 'rc_this_oldid', 'rc_last_oldid' ], $this->fld_ids );
                        $this->addFieldsIf( 'rc_comment', $this->fld_comment || $this->fld_parsedcomment );
                        $this->addFieldsIf( 'rc_user', $this->fld_user || $this->fld_userid );
                        $this->addFieldsIf( 'rc_user_text', $this->fld_user );
                        $this->addFieldsIf( [ 'rc_minor', 'rc_type', 'rc_bot' ], $this->fld_flags );
                        $this->addFieldsIf( [ 'rc_old_len', 'rc_new_len' ], $this->fld_sizes );
                        $this->addFieldsIf( [ 'rc_patrolled', 'rc_log_type' ], $this->fld_patrolled );
                        $this->addFieldsIf(
                                [ 'rc_logid', 'rc_log_type', 'rc_log_action', 'rc_params' ],
                                $this->fld_loginfo
                        );
                        $showRedirects = $this->fld_redirect || isset( $show['redirect'] )
                                || isset( $show['!redirect'] );
                }
                $this->addFieldsIf( [ 'rc_this_oldid' ],
                        $resultPageSet && $params['generaterevisions'] );

                if ( $this->fld_tags ) {
                        $this->addTables( 'tag_summary' );
                        $this->addJoinConds( [ 'tag_summary' => [ 'LEFT JOIN', [ 'rc_id=ts_rc_id' ] ] ] );
                        $this->addFields( 'ts_tags' );
                }

                if ( $this->fld_sha1 ) {
                        $this->addTables( 'revision' );
                        $this->addJoinConds( [ 'revision' => [ 'LEFT JOIN',
                                [ 'rc_this_oldid=rev_id' ] ] ] );
                        $this->addFields( [ 'rev_sha1', 'rev_deleted' ] );
                }

                if ( $params['toponly'] || $showRedirects ) {
                        $this->addTables( 'page' );
                        $this->addJoinConds( [ 'page' => [ 'LEFT JOIN',
                                [ 'rc_namespace=page_namespace', 'rc_title=page_title' ] ] ] );
                        $this->addFields( 'page_is_redirect' );

                        if ( $params['toponly'] ) {
                                $this->addWhere( 'rc_this_oldid = page_latest' );
                        }
                }

                if ( !is_null( $params['tag'] ) ) {
                        $this->addTables( 'change_tag' );
                        $this->addJoinConds( [ 'change_tag' => [ 'INNER JOIN', [ 'rc_id=ct_rc_id' ] ] ] );
                        $this->addWhereFld( 'ct_tag', $params['tag'] );
                }

                // Paranoia: avoid brute force searches (bug 17342)
                if ( !is_null( $params['user'] ) || !is_null( $params['excludeuser'] ) ) {
                        if ( !$user->isAllowed( 'deletedhistory' ) ) {
                                $bitmask = Revision::DELETED_USER;
                        } elseif ( !$user->isAllowedAny( 'suppressrevision', 'viewsuppressed' ) ) {
                                $bitmask = Revision::DELETED_USER | Revision::DELETED_RESTRICTED;
                        } else {
                                $bitmask = 0;
                        }
                        if ( $bitmask ) {
                                $this->addWhere( $this->getDB()->bitAnd( 'rc_deleted', $bitmask ) . " != $bitmask" );
                        }
                }
                if ( $this->getRequest()->getCheck( 'namespace' ) ) {
                        // LogPage::DELETED_ACTION hides the affected page, too.
                        if ( !$user->isAllowed( 'deletedhistory' ) ) {
                                $bitmask = LogPage::DELETED_ACTION;
                        } elseif ( !$user->isAllowedAny( 'suppressrevision', 'viewsuppressed' ) ) {
                                $bitmask = LogPage::DELETED_ACTION | LogPage::DELETED_RESTRICTED;
                        } else {
                                $bitmask = 0;
                        }
                        if ( $bitmask ) {
                                $this->addWhere( $this->getDB()->makeList( [
                                        'rc_type != ' . RC_LOG,
                                        $this->getDB()->bitAnd( 'rc_deleted', $bitmask ) . " != $bitmask",
                                ], LIST_OR ) );
                        }
                }

                $this->token = $params['token'];
                $this->addOption( 'LIMIT', $params['limit'] + 1 );

                $hookData = [];
                $count = 0;
                /* Perform the actual query. */
                $res = $this->select( __METHOD__, [], $hookData );

                $revids = [];
                $titles = [];

                $result = $this->getResult();

                /* Iterate through the rows, adding data extracted from them to our query result. */
                foreach ( $res as $row ) {
                        if ( $count === 0 && $resultPageSet !== null ) {
                                // Set the non-continue since the list of recentchanges is
                                // prone to having entries added at the start frequently.
                                $this->getContinuationManager()->addGeneratorNonContinueParam(
                                        $this, 'continue', "$row->rc_timestamp|$row->rc_id"
                                );
                        }
                        if ( ++$count > $params['limit'] ) {
                                // We've reached the one extra which shows that there are
                                // additional pages to be had. Stop here...
                                $this->setContinueEnumParameter( 'continue', "$row->rc_timestamp|$row->rc_id" );
                                break;
                        }

                        if ( is_null( $resultPageSet ) ) {
                                /* Extract the data from a single row. */
                                $vals = $this->extractRowInfo( $row );

                                /* Add that row's data to our final output. */
                                $fit = $this->processRow( $row, $vals, $hookData ) &&
                                        $result->addValue( [ 'query', $this->getModuleName() ], null, $vals );
                                if ( !$fit ) {
                                        $this->setContinueEnumParameter( 'continue', "$row->rc_timestamp|$row->rc_id" );
                                        break;
                                }
                        } elseif ( $params['generaterevisions'] ) {
                                $revid = (int)$row->rc_this_oldid;
                                if ( $revid > 0 ) {
                                        $revids[] = $revid;
                                }
                        } else {
                                $titles[] = Title::makeTitle( $row->rc_namespace, $row->rc_title );
                        }
                }

                if ( is_null( $resultPageSet ) ) {
                        /* Format the result */
                        $result->addIndexedTagName( [ 'query', $this->getModuleName() ], 'rc' );
                } elseif ( $params['generaterevisions'] ) {
                        $resultPageSet->populateFromRevisionIDs( $revids );
                } else {
                        $resultPageSet->populateFromTitles( $titles );
                }
        }

        /**
         * Extracts from a single sql row the data needed to describe one recent change.
         *
         * @param stdClass $row The row from which to extract the data.
         * @return array An array mapping strings (descriptors) to their respective string values.
         * @access public
         */
        public function extractRowInfo( $row ) {
                /* Determine the title of the page that has been changed. */
                $title = Title::makeTitle( $row->rc_namespace, $row->rc_title );
                $user = $this->getUser();

                /* Our output data. */
                $vals = [];

                $type = intval( $row->rc_type );
                $vals['type'] = RecentChange::parseFromRCType( $type );

                $anyHidden = false;

                /* Create a new entry in the result for the title. */
                if ( $this->fld_title || $this->fld_ids ) {
                        if ( $type === RC_LOG && ( $row->rc_deleted & LogPage::DELETED_ACTION ) ) {
                                $vals['actionhidden'] = true;
                                $anyHidden = true;
                        }
                        if ( $type !== RC_LOG ||
                                LogEventsList::userCanBitfield( $row->rc_deleted, LogPage::DELETED_ACTION, $user )
                        ) {
                                if ( $this->fld_title ) {
                                        ApiQueryBase::addTitleInfo( $vals, $title );
                                }
                                if ( $this->fld_ids ) {
                                        $vals['pageid'] = intval( $row->rc_cur_id );
                                        $vals['revid'] = intval( $row->rc_this_oldid );
                                        $vals['old_revid'] = intval( $row->rc_last_oldid );
                                }
                        }
                }

                if ( $this->fld_ids ) {
                        $vals['rcid'] = intval( $row->rc_id );
                }

                /* Add user data and 'anon' flag, if user is anonymous. */
                if ( $this->fld_user || $this->fld_userid ) {
                        if ( $row->rc_deleted & Revision::DELETED_USER ) {
                                $vals['userhidden'] = true;
                                $anyHidden = true;
                        }
                        if ( Revision::userCanBitfield( $row->rc_deleted, Revision::DELETED_USER, $user ) ) {
                                if ( $this->fld_user ) {
                                        $vals['user'] = $row->rc_user_text;
                                }

                                if ( $this->fld_userid ) {
                                        $vals['userid'] = (int)$row->rc_user;
                                }

                                if ( !$row->rc_user ) {
                                        $vals['anon'] = true;
                                }
                        }
                }

                /* Add flags, such as new, minor, bot. */
                if ( $this->fld_flags ) {
                        $vals['bot'] = (bool)$row->rc_bot;
                        $vals['new'] = $row->rc_type == RC_NEW;
                        $vals['minor'] = (bool)$row->rc_minor;
                }

                /* Add sizes of each revision. (Only available on 1.10+) */
                if ( $this->fld_sizes ) {
                        $vals['oldlen'] = intval( $row->rc_old_len );
                        $vals['newlen'] = intval( $row->rc_new_len );
                }

                /* Add the timestamp. */
                if ( $this->fld_timestamp ) {
                        $vals['timestamp'] = wfTimestamp( TS_ISO_8601, $row->rc_timestamp );
                }

                /* Add edit summary / log summary. */
                if ( $this->fld_comment || $this->fld_parsedcomment ) {
                        if ( $row->rc_deleted & Revision::DELETED_COMMENT ) {
                                $vals['commenthidden'] = true;
                                $anyHidden = true;
                        }
                        if ( Revision::userCanBitfield( $row->rc_deleted, Revision::DELETED_COMMENT, $user ) ) {
                                if ( $this->fld_comment && isset( $row->rc_comment ) ) {
                                        $vals['comment'] = $row->rc_comment;
                                }

                                if ( $this->fld_parsedcomment && isset( $row->rc_comment ) ) {
                                        $vals['parsedcomment'] = Linker::formatComment( $row->rc_comment, $title );
                                }
                        }
                }

                if ( $this->fld_redirect ) {
                        $vals['redirect'] = (bool)$row->page_is_redirect;
                }

                /* Add the patrolled flag */
                if ( $this->fld_patrolled ) {
                        $vals['patrolled'] = $row->rc_patrolled == 1;
                        $vals['unpatrolled'] = ChangesList::isUnpatrolled( $row, $user );
                }

                if ( $this->fld_loginfo && $row->rc_type == RC_LOG ) {
                        if ( $row->rc_deleted & LogPage::DELETED_ACTION ) {
                                $vals['actionhidden'] = true;
                                $anyHidden = true;
                        }
                        if ( LogEventsList::userCanBitfield( $row->rc_deleted, LogPage::DELETED_ACTION, $user ) ) {
                                $vals['logid'] = intval( $row->rc_logid );
                                $vals['logtype'] = $row->rc_log_type;
                                $vals['logaction'] = $row->rc_log_action;
                                $vals['logparams'] = LogFormatter::newFromRow( $row )->formatParametersForApi();
                        }
                }

                if ( $this->fld_tags ) {
                        if ( $row->ts_tags ) {
                                $tags = explode( ',', $row->ts_tags );
                                ApiResult::setIndexedTagName( $tags, 'tag' );
                                $vals['tags'] = $tags;
                        } else {
                                $vals['tags'] = [];
                        }
                }

                if ( $this->fld_sha1 && $row->rev_sha1 !== null ) {
                        if ( $row->rev_deleted & Revision::DELETED_TEXT ) {
                                $vals['sha1hidden'] = true;
                                $anyHidden = true;
                        }
                        if ( Revision::userCanBitfield( $row->rev_deleted, Revision::DELETED_TEXT, $user ) ) {
                                if ( $row->rev_sha1 !== '' ) {
                                        $vals['sha1'] = Wikimedia\base_convert( $row->rev_sha1, 36, 16, 40 );
                                } else {
                                        $vals['sha1'] = '';
                                }
                        }
                }

                if ( !is_null( $this->token ) ) {
                        $tokenFunctions = $this->getTokenFunctions();
                        foreach ( $this->token as $t ) {
                                $val = call_user_func( $tokenFunctions[$t], $row->rc_cur_id,
                                        $title, RecentChange::newFromRow( $row ) );
                                if ( $val === false ) {
                                        $this->addWarning( [ 'apiwarn-tokennotallowed', $t ] );
                                } else {
                                        $vals[$t . 'token'] = $val;
                                }
                        }
                }

                if ( $anyHidden && ( $row->rc_deleted & Revision::DELETED_RESTRICTED ) ) {
                        $vals['suppressed'] = true;
                }

                return $vals;
        }

        public function getCacheMode( $params ) {
                if ( isset( $params['show'] ) ) {
                        foreach ( $params['show'] as $show ) {
                                if ( $show === 'patrolled' || $show === '!patrolled' ) {
                                        return 'private';
                                }
                        }
                }
                if ( isset( $params['token'] ) ) {
                        return 'private';
                }
                if ( $this->userCanSeeRevDel() ) {
                        return 'private';
                }
                if ( !is_null( $params['prop'] ) && in_array( 'parsedcomment', $params['prop'] ) ) {
                        // formatComment() calls wfMessage() among other things
                        return 'anon-public-user-private';
                }

                return 'public';
        }

        public function getAllowedParams() {
                return [
                        'start' => [
                                ApiBase::PARAM_TYPE => 'timestamp'
                        ],
                        'end' => [
                                ApiBase::PARAM_TYPE => 'timestamp'
                        ],
                        'dir' => [
                                ApiBase::PARAM_DFLT => 'older',
                                ApiBase::PARAM_TYPE => [
                                        'newer',
                                        'older'
                                ],
                                ApiBase::PARAM_HELP_MSG => 'api-help-param-direction',
                        ],
                        'namespace' => [
                                ApiBase::PARAM_ISMULTI => true,
                                ApiBase::PARAM_TYPE => 'namespace',
                                ApiBase::PARAM_EXTRA_NAMESPACES => [ NS_MEDIA, NS_SPECIAL ],
                        ],
                        'user' => [
                                ApiBase::PARAM_TYPE => 'user'
                        ],
                        'excludeuser' => [
                                ApiBase::PARAM_TYPE => 'user'
                        ],
                        'tag' => null,
                        'prop' => [
                                ApiBase::PARAM_ISMULTI => true,
                                ApiBase::PARAM_DFLT => 'title|timestamp|ids',
                                ApiBase::PARAM_TYPE => [
                                        'user',
                                        'userid',
                                        'comment',
                                        'parsedcomment',
                                        'flags',
                                        'timestamp',
                                        'title',
                                        'ids',
                                        'sizes',
                                        'redirect',
                                        'patrolled',
                                        'loginfo',
                                        'tags',
                                        'sha1',
                                ],
                                ApiBase::PARAM_HELP_MSG_PER_VALUE => [],
                        ],
                        'token' => [
                                ApiBase::PARAM_DEPRECATED => true,
                                ApiBase::PARAM_TYPE => array_keys( $this->getTokenFunctions() ),
                                ApiBase::PARAM_ISMULTI => true
                        ],
                        'show' => [
                                ApiBase::PARAM_ISMULTI => true,
                                ApiBase::PARAM_TYPE => [
                                        'minor',
                                        '!minor',
                                        'bot',
                                        '!bot',
                                        'anon',
                                        '!anon',
                                        'redirect',
                                        '!redirect',
                                        'patrolled',
                                        '!patrolled',
                                        'unpatrolled'
                                ]
                        ],
                        'limit' => [
                                ApiBase::PARAM_DFLT => 10,
                                ApiBase::PARAM_TYPE => 'limit',
                                ApiBase::PARAM_MIN => 1,
                                ApiBase::PARAM_MAX => ApiBase::LIMIT_BIG1,
                                ApiBase::PARAM_MAX2 => ApiBase::LIMIT_BIG2
                        ],
                        'type' => [
                                ApiBase::PARAM_DFLT => 'edit|new|log|categorize',
                                ApiBase::PARAM_ISMULTI => true,
                                ApiBase::PARAM_TYPE => RecentChange::getChangeTypes()
                        ],
                        'toponly' => false,
                        'continue' => [
                                ApiBase::PARAM_HELP_MSG => 'api-help-param-continue',
                        ],
                        'generaterevisions' => false,
                ];
        }

        protected function getExamplesMessages() {
                return [
                        'action=query&list=recentchanges'
                                => 'apihelp-query+recentchanges-example-simple',
                        'action=query&generator=recentchanges&grcshow=!patrolled&prop=info'
                                => 'apihelp-query+recentchanges-example-generator',
                ];
        }

        public function getHelpUrls() {
                return 'https://www.mediawiki.org/wiki/API:Recentchanges';
        }
}