ApiQueryContributors.php

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<?php
use MediaWiki\MediaWikiServices;
use MediaWiki\Revision\RevisionRecord;

class ApiQueryContributors extends ApiQueryBase {
    const MAX_PAGES = 100;

    public function __construct( ApiQuery $query, $moduleName ) {
        // "pc" is short for "page contributors", "co" was already taken by the
        // GeoData extension's prop=coordinates.
        parent::__construct( $query, $moduleName, 'pc' );
    }

    public function execute() {
        $db = $this->getDB();
        $params = $this->extractRequestParams();
        $this->requireMaxOneParameter( $params, 'group', 'excludegroup', 'rights', 'excluderights' );

        // Only operate on existing pages
        $pages = array_keys( $this->getPageSet()->getGoodTitles() );

        // Filter out already-processed pages
        if ( $params['continue'] !== null ) {
            $cont = explode( '|', $params['continue'] );
            $this->dieContinueUsageIf( count( $cont ) != 2 );
            $cont_page = (int)$cont[0];
            $pages = array_filter( $pages, function ( $v ) use ( $cont_page ) {
                return $v >= $cont_page;
            } );
        }
        if ( $pages === [] ) {
            // Nothing to do
            return;
        }

        // Apply MAX_PAGES, leaving any over the limit for a continue.
        sort( $pages );
        $continuePages = null;
        if ( count( $pages ) > self::MAX_PAGES ) {
            $continuePages = $pages[self::MAX_PAGES] . '|0';
            $pages = array_slice( $pages, 0, self::MAX_PAGES );
        }

        $result = $this->getResult();
        $revQuery = MediaWikiServices::getInstance()->getRevisionStore()->getQueryInfo();

        // Target indexes on the revision_actor_temp table.
        $pageField = 'revactor_page';
        $idField = 'revactor_actor';
        $countField = 'revactor_actor';

        // First, count anons
        $this->addTables( $revQuery['tables'] );
        $this->addJoinConds( $revQuery['joins'] );
        $this->addFields( [
            'page' => $pageField,
            'anons' => "COUNT(DISTINCT $countField)",
        ] );
        $this->addWhereFld( $pageField, $pages );
        $this->addWhere( ActorMigration::newMigration()->isAnon( $revQuery['fields']['rev_user'] ) );
        $this->addWhere( $db->bitAnd( 'rev_deleted', RevisionRecord::DELETED_USER ) . ' = 0' );
        $this->addOption( 'GROUP BY', $pageField );
        $res = $this->select( __METHOD__ );
        foreach ( $res as $row ) {
            $fit = $result->addValue( [ 'query', 'pages', $row->page ],
                'anoncontributors', (int)$row->anons
            );
            if ( !$fit ) {
                // This not fitting isn't reasonable, so it probably means that
                // some other module used up all the space. Just set a dummy
                // continue and hope it works next time.
                $this->setContinueEnumParameter( 'continue',
                    $params['continue'] ?? '0|0'
                );

                return;
            }
        }

        // Next, add logged-in users
        $this->resetQueryParams();
        $this->addTables( $revQuery['tables'] );
        $this->addJoinConds( $revQuery['joins'] );
        $this->addFields( [
            'page' => $pageField,
            'id' => $idField,
            // Non-MySQL databases don't like partial group-by
            'userid' => 'MAX(' . $revQuery['fields']['rev_user'] . ')',
            'username' => 'MAX(' . $revQuery['fields']['rev_user_text'] . ')',
        ] );
        $this->addWhereFld( $pageField, $pages );
        $this->addWhere( ActorMigration::newMigration()->isNotAnon( $revQuery['fields']['rev_user'] ) );
        $this->addWhere( $db->bitAnd( 'rev_deleted', RevisionRecord::DELETED_USER ) . ' = 0' );
        $this->addOption( 'GROUP BY', [ $pageField, $idField ] );
        $this->addOption( 'LIMIT', $params['limit'] + 1 );

        // Force a sort order to ensure that properties are grouped by page
        // But only if rev_page is not constant in the WHERE clause.
        if ( count( $pages ) > 1 ) {
            $this->addOption( 'ORDER BY', [ 'page', 'id' ] );
        } else {
            $this->addOption( 'ORDER BY', 'id' );
        }

        $limitGroups = [];
        if ( $params['group'] ) {
            $excludeGroups = false;
            $limitGroups = $params['group'];
        } elseif ( $params['excludegroup'] ) {
            $excludeGroups = true;
            $limitGroups = $params['excludegroup'];
        } elseif ( $params['rights'] ) {
            $excludeGroups = false;
            foreach ( $params['rights'] as $r ) {
                $limitGroups = array_merge( $limitGroups, $this->getPermissionManager()
                    ->getGroupsWithPermission( $r ) );
            }

            // If no group has the rights requested, no need to query
            if ( !$limitGroups ) {
                if ( $continuePages !== null ) {
                    // But we still need to continue for the next page's worth
                    // of anoncontributors
                    $this->setContinueEnumParameter( 'continue', $continuePages );
                }

                return;
            }
        } elseif ( $params['excluderights'] ) {
            $excludeGroups = true;
            foreach ( $params['excluderights'] as $r ) {
                $limitGroups = array_merge( $limitGroups, $this->getPermissionManager()
                    ->getGroupsWithPermission( $r ) );
            }
        }

        if ( $limitGroups ) {
            $limitGroups = array_unique( $limitGroups );
            $this->addTables( 'user_groups' );
            $this->addJoinConds( [ 'user_groups' => [
                $excludeGroups ? 'LEFT JOIN' : 'JOIN',
                [
                    'ug_user=' . $revQuery['fields']['rev_user'],
                    'ug_group' => $limitGroups,
                    'ug_expiry IS NULL OR ug_expiry >= ' . $db->addQuotes( $db->timestamp() )
                ]
            ] ] );
            $this->addWhereIf( 'ug_user IS NULL', $excludeGroups );
        }

        if ( $params['continue'] !== null ) {
            $cont = explode( '|', $params['continue'] );
            $this->dieContinueUsageIf( count( $cont ) != 2 );
            $cont_page = (int)$cont[0];
            $cont_id = (int)$cont[1];
            $this->addWhere(
                "$pageField > $cont_page OR " .
                "($pageField = $cont_page AND " .
                "$idField >= $cont_id)"
            );
        }

        $res = $this->select( __METHOD__ );
        $count = 0;
        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', $row->page . '|' . $row->id );
                return;
            }

            $fit = $this->addPageSubItem( $row->page,
                [ 'userid' => (int)$row->userid, 'name' => $row->username ],
                'user'
            );
            if ( !$fit ) {
                $this->setContinueEnumParameter( 'continue', $row->page . '|' . $row->id );
                return;
            }
        }

        if ( $continuePages !== null ) {
            $this->setContinueEnumParameter( 'continue', $continuePages );
        }
    }

    public function getCacheMode( $params ) {
        return 'public';
    }

    public function getAllowedParams() {
        $userGroups = User::getAllGroups();
        $userRights = $this->getPermissionManager()->getAllPermissions();

        return [
            'group' => [
                ApiBase::PARAM_TYPE => $userGroups,
                ApiBase::PARAM_ISMULTI => true,
            ],
            'excludegroup' => [
                ApiBase::PARAM_TYPE => $userGroups,
                ApiBase::PARAM_ISMULTI => true,
            ],
            'rights' => [
                ApiBase::PARAM_TYPE => $userRights,
                ApiBase::PARAM_ISMULTI => true,
            ],
            'excluderights' => [
                ApiBase::PARAM_TYPE => $userRights,
                ApiBase::PARAM_ISMULTI => true,
            ],
            '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
            ],
            'continue' => [
                ApiBase::PARAM_HELP_MSG => 'api-help-param-continue',
            ],
        ];
    }

    protected function getExamplesMessages() {
        return [
            'action=query&prop=contributors&titles=Main_Page'
                => 'apihelp-query+contributors-example-simple',
        ];
    }

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