ApiQueryRecentChanges.php

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<?php
class ApiQueryRecentChanges extends ApiQueryGeneratorBase {

    public function __construct( $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 = array();

    private $tokenFunctions;

    protected function getTokenFunctions() {
        // Don't call the hooks twice
        if ( isset( $this->tokenFunctions ) ) {
            return $this->tokenFunctions;
        }

        // If we're in JSON callback mode, no tokens can be obtained
        if ( !is_null( $this->getMain()->getRequest()->getVal( 'callback' ) ) ) {
            return array();
        }

        $this->tokenFunctions = array(
            'patrol' => array( 'ApiQueryRecentChanges', 'getPatrolToken' )
        );
        wfRunHooks( 'APIQueryRecentChangesTokens', array( &$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;
            }
        } else {
            if ( $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;
        } else {
            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
         *      AND rc_deleted = 0
         */
        $this->addTables( 'recentchanges' );
        $index = array( 'recentchanges' => 'rc_timestamp' ); // May change
        $this->addTimestampWhereRange( 'rc_timestamp', $params['dir'], $params['start'], $params['end'] );

        if ( !is_null( $params['continue'] ) ) {
            $cont = explode( '|', $params['continue'] );
            if ( count( $cont ) != 2 ) {
                $this->dieUsage( 'Invalid continue param. You should pass the ' .
                                'original value returned by the previous query', '_badcontinue' );
            }

            $timestamp = $this->getDB()->addQuotes( wfTimestamp( TS_MW, $cont[0] ) );
            $id = intval( $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', array(
            "rc_timestamp $order",
            "rc_id $order",
        ) );

        $this->addWhereFld( 'rc_namespace', $params['namespace'] );
        $this->addWhereFld( 'rc_deleted', 0 );

        if ( !is_null( $params['type'] ) ) {
            $this->addWhereFld( 'rc_type', $this->parseRCType( $params['type'] ) );
        }

        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'] ) )
            ) {
                $this->dieUsageMsg( 'show' );
            }

            // Check permissions
            if ( isset( $show['patrolled'] ) || isset( $show['!patrolled'] ) ) {
                if ( !$user->useRCPatrol() && !$user->useNPPatrol() ) {
                    $this->dieUsage( 'You need the patrol right to request the patrolled flag', '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'] ) );

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

        if ( !is_null( $params['user'] ) && !is_null( $params['excludeuser'] ) ) {
            $this->dieUsage( 'user and excludeuser cannot be used together', 'user-excludeuser' );
        }

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

        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( array(
            '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->dieUsage( 'You need the patrol right to request the patrolled flag', 'permissiondenied' );
            }

            $this->addFields( 'rc_id' );
            /* Add fields to our query if they are specified as a needed parameter. */
            $this->addFieldsIf( array( '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->addFieldsIf( 'rc_user_text', $this->fld_user || $this->fld_userid );
            $this->addFieldsIf( array( 'rc_minor', 'rc_type', 'rc_bot' ), $this->fld_flags );
            $this->addFieldsIf( array( 'rc_old_len', 'rc_new_len' ), $this->fld_sizes );
            $this->addFieldsIf( 'rc_patrolled', $this->fld_patrolled );
            $this->addFieldsIf( array( 'rc_logid', 'rc_log_type', 'rc_log_action', 'rc_params' ), $this->fld_loginfo );
            $showRedirects = $this->fld_redirect || isset( $show['redirect'] ) || isset( $show['!redirect'] );
        }

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

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

        if ( $params['toponly'] || $showRedirects ) {
            $this->addTables( 'page' );
            $this->addJoinConds( array( 'page' => array( 'LEFT JOIN', array( '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( array( 'change_tag' => array( 'INNER JOIN', array( 'rc_id=ct_rc_id' ) ) ) );
            $this->addWhereFld( 'ct_tag', $params['tag'] );
            $index['change_tag'] = 'change_tag_tag_id';
        }

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

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

        $titles = array();

        $result = $this->getResult();

        /* Iterate through the rows, adding data extracted from them to our query result. */
        foreach ( $res as $row ) {
            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', wfTimestamp( TS_ISO_8601, $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. */
                if ( !$vals ) {
                    continue;
                }
                $fit = $result->addValue( array( 'query', $this->getModuleName() ), null, $vals );
                if ( !$fit ) {
                    $this->setContinueEnumParameter( 'continue', wfTimestamp( TS_ISO_8601, $row->rc_timestamp ) . '|' . $row->rc_id );
                    break;
                }
            } else {
                $titles[] = Title::makeTitle( $row->rc_namespace, $row->rc_title );
            }
        }

        if ( is_null( $resultPageSet ) ) {
            /* Format the result */
            $result->setIndexedTagName_internal( array( 'query', $this->getModuleName() ), 'rc' );
        } 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 );

        /* Our output data. */
        $vals = array();

        $type = intval( $row->rc_type );

        /* Determine what kind of change this was. */
        switch ( $type ) {
            case RC_EDIT:
                $vals['type'] = 'edit';
                break;
            case RC_NEW:
                $vals['type'] = 'new';
                break;
            case RC_MOVE:
                $vals['type'] = 'move';
                break;
            case RC_LOG:
                $vals['type'] = 'log';
                break;
            case RC_EXTERNAL:
                $vals['type'] = 'external';
                break;
            case RC_MOVE_OVER_REDIRECT:
                $vals['type'] = 'move over redirect';
                break;
            default:
                $vals['type'] = $type;
        }

        /* Create a new entry in the result for the title. */
        if ( $this->fld_title ) {
            ApiQueryBase::addTitleInfo( $vals, $title );
        }

        /* Add ids, such as rcid, pageid, revid, and oldid to the change's info. */
        if ( $this->fld_ids ) {
            $vals['rcid'] = intval( $row->rc_id );
            $vals['pageid'] = intval( $row->rc_cur_id );
            $vals['revid'] = intval( $row->rc_this_oldid );
            $vals['old_revid'] = intval( $row->rc_last_oldid );
        }

        /* Add user data and 'anon' flag, if use is anonymous. */
        if ( $this->fld_user || $this->fld_userid ) {

            if ( $this->fld_user ) {
                $vals['user'] = $row->rc_user_text;
            }

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

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

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

        /* Add the patrolled flag */
        if ( $this->fld_patrolled && $row->rc_patrolled == 1 ) {
            $vals['patrolled'] = '';
        }

        if ( $this->fld_loginfo && $row->rc_type == RC_LOG ) {
            $vals['logid'] = intval( $row->rc_logid );
            $vals['logtype'] = $row->rc_log_type;
            $vals['logaction'] = $row->rc_log_action;
            $logEntry = DatabaseLogEntry::newFromRow( (array)$row );
            ApiQueryLogEvents::addLogParams(
                $this->getResult(),
                $vals,
                $logEntry->getParameters(),
                $logEntry->getType(),
                $logEntry->getSubtype(),
                $logEntry->getTimestamp()
            );
        }

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

        if ( $this->fld_sha1 && $row->rev_sha1 !== null ) {
            // The RevDel check should currently never pass due to the
            // rc_deleted = 0 condition in the WHERE clause, but in case that
            // ever changes we check it here too.
            if ( $row->rev_deleted & Revision::DELETED_TEXT ) {
                $vals['sha1hidden'] = '';
            } elseif ( $row->rev_sha1 !== '' ) {
                $vals['sha1'] = wfBaseConvert( $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 ) {
                    $this->setWarning( "Action '$t' is not allowed for the current user" );
                } else {
                    $vals[$t . 'token'] = $val;
                }
            }
        }

        return $vals;
    }

    private function parseRCType( $type ) {
        if ( is_array( $type ) ) {
            $retval = array();
            foreach ( $type as $t ) {
                $retval[] = $this->parseRCType( $t );
            }
            return $retval;
        }
        switch ( $type ) {
            case 'edit':
                return RC_EDIT;
            case 'new':
                return RC_NEW;
            case 'log':
                return RC_LOG;
            case 'external':
                return RC_EXTERNAL;
        }
    }

    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 ( !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 array(
            'start' => array(
                ApiBase::PARAM_TYPE => 'timestamp'
            ),
            'end' => array(
                ApiBase::PARAM_TYPE => 'timestamp'
            ),
            'dir' => array(
                ApiBase::PARAM_DFLT => 'older',
                ApiBase::PARAM_TYPE => array(
                    'newer',
                    'older'
                )
            ),
            'namespace' => array(
                ApiBase::PARAM_ISMULTI => true,
                ApiBase::PARAM_TYPE => 'namespace'
            ),
            'user' => array(
                ApiBase::PARAM_TYPE => 'user'
            ),
            'excludeuser' => array(
                ApiBase::PARAM_TYPE => 'user'
            ),
            'tag' => null,
            'prop' => array(
                ApiBase::PARAM_ISMULTI => true,
                ApiBase::PARAM_DFLT => 'title|timestamp|ids',
                ApiBase::PARAM_TYPE => array(
                    'user',
                    'userid',
                    'comment',
                    'parsedcomment',
                    'flags',
                    'timestamp',
                    'title',
                    'ids',
                    'sizes',
                    'redirect',
                    'patrolled',
                    'loginfo',
                    'tags',
                    'sha1',
                )
            ),
            'token' => array(
                ApiBase::PARAM_TYPE => array_keys( $this->getTokenFunctions() ),
                ApiBase::PARAM_ISMULTI => true
            ),
            'show' => array(
                ApiBase::PARAM_ISMULTI => true,
                ApiBase::PARAM_TYPE => array(
                    'minor',
                    '!minor',
                    'bot',
                    '!bot',
                    'anon',
                    '!anon',
                    'redirect',
                    '!redirect',
                    'patrolled',
                    '!patrolled'
                )
            ),
            'limit' => array(
                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' => array(
                ApiBase::PARAM_ISMULTI => true,
                ApiBase::PARAM_TYPE => array(
                    'edit',
                    'external',
                    'new',
                    'log'
                )
            ),
            'toponly' => false,
            'continue' => null,
        );
    }

    public function getParamDescription() {
        $p = $this->getModulePrefix();
        return array(
            'start' => 'The timestamp to start enumerating from',
            'end' => 'The timestamp to end enumerating',
            'dir' => $this->getDirectionDescription( $p ),
            'namespace' => 'Filter log entries to only this namespace(s)',
            'user' => 'Only list changes by this user',
            'excludeuser' => 'Don\'t list changes by this user',
            'prop' => array(
                'Include additional pieces of information',
                ' user           - Adds the user responsible for the edit and tags if they are an IP',
                ' userid         - Adds the user id responsible for the edit',
                ' comment        - Adds the comment for the edit',
                ' parsedcomment  - Adds the parsed comment for the edit',
                ' flags          - Adds flags for the edit',
                ' timestamp      - Adds timestamp of the edit',
                ' title          - Adds the page title of the edit',
                ' ids            - Adds the page ID, recent changes ID and the new and old revision ID',
                ' sizes          - Adds the new and old page length in bytes',
                ' redirect       - Tags edit if page is a redirect',
                ' patrolled      - Tags edits that have been patrolled',
                ' loginfo        - Adds log information (logid, logtype, etc) to log entries',
                ' tags           - Lists tags for the entry',
                ' sha1           - Adds the content checksum for entries associated with a revision',
            ),
            'token' => 'Which tokens to obtain for each change',
            'show' => array(
                'Show only items that meet this criteria.',
                "For example, to see only minor edits done by logged-in users, set {$p}show=minor|!anon"
            ),
            'type' => 'Which types of changes to show',
            'limit' => 'How many total changes to return',
            'tag' => 'Only list changes tagged with this tag',
            'toponly' => 'Only list changes which are the latest revision',
            'continue' => 'When more results are available, use this to continue',
        );
    }

    public function getResultProperties() {
        global $wgLogTypes;
        $props = array(
            '' => array(
                'type' => array(
                    ApiBase::PROP_TYPE => array(
                        'edit',
                        'new',
                        'move',
                        'log',
                        'move over redirect'
                    )
                )
            ),
            'title' => array(
                'ns' => 'namespace',
                'title' => 'string',
                'new_ns' => array(
                    ApiBase::PROP_TYPE => 'namespace',
                    ApiBase::PROP_NULLABLE => true
                ),
                'new_title' => array(
                    ApiBase::PROP_TYPE => 'string',
                    ApiBase::PROP_NULLABLE => true
                )
            ),
            'ids' => array(
                'rcid' => 'integer',
                'pageid' => 'integer',
                'revid' => 'integer',
                'old_revid' => 'integer'
            ),
            'user' => array(
                'user' => 'string',
                'anon' => 'boolean'
            ),
            'userid' => array(
                'userid' => 'integer',
                'anon' => 'boolean'
            ),
            'flags' => array(
                'bot' => 'boolean',
                'new' => 'boolean',
                'minor' => 'boolean'
            ),
            'sizes' => array(
                'oldlen' => 'integer',
                'newlen' => 'integer'
            ),
            'timestamp' => array(
                'timestamp' => 'timestamp'
            ),
            'comment' => array(
                'comment' => array(
                    ApiBase::PROP_TYPE => 'string',
                    ApiBase::PROP_NULLABLE => true
                )
            ),
            'parsedcomment' => array(
                'parsedcomment' => array(
                    ApiBase::PROP_TYPE => 'string',
                    ApiBase::PROP_NULLABLE => true
                )
            ),
            'redirect' => array(
                'redirect' => 'boolean'
            ),
            'patrolled' => array(
                'patrolled' => 'boolean'
            ),
            'loginfo' => array(
                'logid' => array(
                    ApiBase::PROP_TYPE => 'integer',
                    ApiBase::PROP_NULLABLE => true
                ),
                'logtype' => array(
                    ApiBase::PROP_TYPE => $wgLogTypes,
                    ApiBase::PROP_NULLABLE => true
                ),
                'logaction' => array(
                    ApiBase::PROP_TYPE => 'string',
                    ApiBase::PROP_NULLABLE => true
                )
            ),
            'sha1' => array(
                'sha1' => array(
                    ApiBase::PROP_TYPE => 'string',
                    ApiBase::PROP_NULLABLE => true
                ),
                'sha1hidden' => array(
                    ApiBase::PROP_TYPE => 'boolean',
                    ApiBase::PROP_NULLABLE => true
                ),
            ),
        );

        self::addTokenProperties( $props, $this->getTokenFunctions() );

        return $props;
    }

    public function getDescription() {
        return 'Enumerate recent changes';
    }

    public function getPossibleErrors() {
        return array_merge( parent::getPossibleErrors(), array(
            array( 'show' ),
            array( 'code' => 'permissiondenied', 'info' => 'You need the patrol right to request the patrolled flag' ),
            array( 'code' => 'user-excludeuser', 'info' => 'user and excludeuser cannot be used together' ),
        ) );
    }

    public function getExamples() {
        return array(
            'api.php?action=query&list=recentchanges'
        );
    }

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