ApiQueryRecentChanges.php

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<?php
use MediaWiki\MediaWikiServices;
use MediaWiki\Revision\RevisionRecord;
use MediaWiki\Storage\NameTableAccessException;
 
class ApiQueryRecentChanges extends ApiQueryGeneratorBase {
 
    public function __construct( ApiQuery $query, $moduleName ) {
        parent::__construct( $query, $moduleName, 'rc' );
    }
 
    private $commentStore;
 
    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;
 
    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 [];
        }
 
        $this->tokenFunctions = [
            'patrol' => [ self::class, 'getPatrolToken' ]
        ];
        Hooks::run( 'APIQueryRecentChangesTokens', [ &$this->tokenFunctions ] );
 
        return $this->tokenFunctions;
    }
 
    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;
    }
 
    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 );
    }
 
    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] ) );
            $id = (int)$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() );
            }
        }
 
        $title = $params['title'];
        if ( !is_null( $title ) ) {
            $titleObj = Title::newFromText( $title );
            if ( is_null( $titleObj ) ) {
                $this->dieWithError( [ 'apierror-invalidtitle', wfEscapeWikiText( $title ) ] );
            }
            $this->addWhereFld( 'rc_namespace', $titleObj->getNamespace() );
            $this->addWhereFld( 'rc_title', $titleObj->getDBkey() );
        }
 
        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'] ) )
                || ( isset( $show['autopatrolled'] ) && isset( $show['!autopatrolled'] ) )
                || ( isset( $show['autopatrolled'] ) && isset( $show['unpatrolled'] ) )
                || ( isset( $show['autopatrolled'] ) && isset( $show['!patrolled'] ) )
            ) {
                $this->dieWithError( 'apierror-show' );
            }
 
            // Check permissions
            if ( $this->includesPatrollingFlags( $show ) ) {
                if ( !$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'] ) );
            if ( isset( $show['anon'] ) || isset( $show['!anon'] ) ) {
                $actorMigration = ActorMigration::newMigration();
                $actorQuery = $actorMigration->getJoin( 'rc_user' );
                $this->addTables( $actorQuery['tables'] );
                $this->addJoinConds( $actorQuery['joins'] );
                $this->addWhereIf(
                    $actorMigration->isAnon( $actorQuery['fields']['rc_user'] ), isset( $show['anon'] )
                );
                $this->addWhereIf(
                    $actorMigration->isNotAnon( $actorQuery['fields']['rc_user'] ), 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 = ' . RecentChange::PRC_UNPATROLLED );
                } elseif ( $user->useNPPatrol() ) {
                    $this->addWhere( 'rc_patrolled = ' . RecentChange::PRC_UNPATROLLED );
                    $this->addWhereFld( 'rc_type', RC_NEW );
                }
            }
 
            $this->addWhereIf(
                'rc_patrolled != ' . RecentChange::PRC_AUTOPATROLLED,
                isset( $show['!autopatrolled'] )
            );
            $this->addWhereIf(
                'rc_patrolled = ' . RecentChange::PRC_AUTOPATROLLED,
                isset( $show['autopatrolled'] )
            );
 
            // 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'] ) ) {
            // Don't query by user ID here, it might be able to use the rc_user_text index.
            $actorQuery = ActorMigration::newMigration()
                ->getWhere( $this->getDB(), 'rc_user', User::newFromName( $params['user'], false ), false );
            $this->addTables( $actorQuery['tables'] );
            $this->addJoinConds( $actorQuery['joins'] );
            $this->addWhere( $actorQuery['conds'] );
        }
 
        if ( !is_null( $params['excludeuser'] ) ) {
            // Here there's no chance to use the rc_user_text index, so allow ID to be used.
            $actorQuery = ActorMigration::newMigration()
                ->getWhere( $this->getDB(), 'rc_user', User::newFromName( $params['excludeuser'], false ) );
            $this->addTables( $actorQuery['tables'] );
            $this->addJoinConds( $actorQuery['joins'] );
            $this->addWhere( 'NOT(' . $actorQuery['conds'] . ')' );
        }
 
        /* 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 );
            if ( $this->fld_user || $this->fld_userid ) {
                $actorQuery = ActorMigration::newMigration()->getJoin( 'rc_user' );
                $this->addTables( $actorQuery['tables'] );
                $this->addFields( $actorQuery['fields'] );
                $this->addJoinConds( $actorQuery['joins'] );
            }
            $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->addFields( [ 'ts_tags' => ChangeTags::makeTagSummarySubquery( 'recentchanges' ) ] );
        }
 
        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' => [ 'JOIN', [ 'rc_id=ct_rc_id' ] ] ] );
            $changeTagDefStore = MediaWikiServices::getInstance()->getChangeTagDefStore();
            try {
                $this->addWhereFld( 'ct_tag_id', $changeTagDefStore->getId( $params['tag'] ) );
            } catch ( NameTableAccessException $exception ) {
                // Return nothing.
                $this->addWhere( '1=0' );
            }
        }
 
        // Paranoia: avoid brute force searches (T19342)
        if ( !is_null( $params['user'] ) || !is_null( $params['excludeuser'] ) ) {
            if ( !$user->isAllowed( 'deletedhistory' ) ) {
                $bitmask = RevisionRecord::DELETED_USER;
            } elseif ( !$user->isAllowedAny( 'suppressrevision', 'viewsuppressed' ) ) {
                $bitmask = RevisionRecord::DELETED_USER | RevisionRecord::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'];
 
        if ( $this->fld_comment || $this->fld_parsedcomment || $this->token ) {
            $this->commentStore = CommentStore::getStore();
            $commentQuery = $this->commentStore->getJoin( 'rc_comment' );
            $this->addTables( $commentQuery['tables'] );
            $this->addFields( $commentQuery['fields'] );
            $this->addJoinConds( $commentQuery['joins'] );
        }
 
        $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 );
        }
    }
 
    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 = [];
 
        $type = (int)$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 ) {
                    $vals['pageid'] = (int)$row->rc_cur_id;
                    $vals['revid'] = (int)$row->rc_this_oldid;
                    $vals['old_revid'] = (int)$row->rc_last_oldid;
                }
            }
        }
 
        if ( $this->fld_ids ) {
            $vals['rcid'] = (int)$row->rc_id;
        }
 
        /* Add user data and 'anon' flag, if user is anonymous. */
        if ( $this->fld_user || $this->fld_userid ) {
            if ( $row->rc_deleted & RevisionRecord::DELETED_USER ) {
                $vals['userhidden'] = true;
                $anyHidden = true;
            }
            if ( RevisionRecord::userCanBitfield( $row->rc_deleted, RevisionRecord::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 ) {
            $vals['oldlen'] = (int)$row->rc_old_len;
            $vals['newlen'] = (int)$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 & RevisionRecord::DELETED_COMMENT ) {
                $vals['commenthidden'] = true;
                $anyHidden = true;
            }
            if ( RevisionRecord::userCanBitfield(
                $row->rc_deleted, RevisionRecord::DELETED_COMMENT, $user
            ) ) {
                $comment = $this->commentStore->getComment( 'rc_comment', $row )->text;
                if ( $this->fld_comment ) {
                    $vals['comment'] = $comment;
                }
 
                if ( $this->fld_parsedcomment ) {
                    $vals['parsedcomment'] = Linker::formatComment( $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 != RecentChange::PRC_UNPATROLLED;
            $vals['unpatrolled'] = ChangesList::isUnpatrolled( $row, $user );
            $vals['autopatrolled'] = $row->rc_patrolled == RecentChange::PRC_AUTOPATROLLED;
        }
 
        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 ) ) {
                $vals['logid'] = (int)$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 & RevisionRecord::DELETED_TEXT ) {
                $vals['sha1hidden'] = true;
                $anyHidden = true;
            }
            if ( RevisionRecord::userCanBitfield(
                $row->rev_deleted, RevisionRecord::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 & RevisionRecord::DELETED_RESTRICTED ) ) {
            $vals['suppressed'] = true;
        }
 
        return $vals;
    }
 
    private function includesPatrollingFlags( array $flagsArray ) {
        return isset( $flagsArray['patrolled'] ) ||
            isset( $flagsArray['!patrolled'] ) ||
            isset( $flagsArray['unpatrolled'] ) ||
            isset( $flagsArray['autopatrolled'] ) ||
            isset( $flagsArray['!autopatrolled'] );
    }
 
    public function getCacheMode( $params ) {
        if ( isset( $params['show'] ) &&
            $this->includesPatrollingFlags( array_flip( $params['show'] ) )
        ) {
            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',
                    'autopatrolled',
                    '!autopatrolled',
                ]
            ],
            '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,
            'title' => null,
            '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/Special:MyLanguage/API:Recentchanges';
    }
}