ApiQueryImages.php

Go to the documentation of this file.

<?php
namespace MediaWiki\Api;
 
use MediaWiki\Deferred\LinksUpdate\ImageLinksTable;
use MediaWiki\Linker\LinksMigration;
use MediaWiki\MainConfigNames;
use MediaWiki\Title\Title;
use Wikimedia\ParamValidator\ParamValidator;
use Wikimedia\ParamValidator\TypeDef\IntegerDef;
 
class ApiQueryImages extends ApiQueryGeneratorBase {
 
    private LinksMigration $linksMigration;
 
    public function __construct( ApiQuery $query, string $moduleName, LinksMigration $linksMigration ) {
        parent::__construct( $query, $moduleName, 'im' );
        $this->linksMigration = $linksMigration;
    }
 
    public function execute() {
        $this->run();
    }
 
    public function executeGenerator( $resultPageSet ) {
        $this->run( $resultPageSet );
    }
 
    private function run( $resultPageSet = null ) {
        $pages = $this->getPageSet()->getGoodPages();
        if ( $pages === [] ) {
            return; // nothing to do
        }
 
        $params = $this->extractRequestParams();
 
        $migrationStage = $this->getConfig()->get( MainConfigNames::ImageLinksSchemaMigrationStage );
        $queryInfo = $this->linksMigration->getQueryInfo( 'imagelinks' );
 
        $this->addTables( $queryInfo['tables'] );
 
        if ( $migrationStage & SCHEMA_COMPAT_READ_NEW ) {
            $this->addFields( [ 'il_from', 'il_to' => 'lt_title' ] );
            $this->addJoinConds( $queryInfo['joins'] );
        } else {
            $this->addFields( [ 'il_from', 'il_to' ] );
        }
 
        $this->addWhereFld( 'il_from', array_keys( $pages ) );
        if ( $params['continue'] !== null ) {
            $cont = $this->parseContinueParamOrDie( $params['continue'], [ 'int', 'string' ] );
            $op = $params['dir'] == 'descending' ? '<=' : '>=';
            $comparison = [ 'il_from' => $cont[0] ];
            if ( $migrationStage & SCHEMA_COMPAT_READ_NEW ) {
                $comparison['lt_namespace'] = NS_FILE;
                $comparison['lt_title'] = $cont[1];
            } else {
                $comparison['il_to'] = $cont[1];
            }
            $this->addWhere( $this->getDB()->buildComparison( $op, $comparison ) );
        }
 
        $sort = ( $params['dir'] == 'descending' ? ' DESC' : '' );
        // Don't order by il_from if it's constant in the WHERE clause
        if ( count( $pages ) === 1 ) {
            $this->addOption( 'ORDER BY', 'il_to' . $sort );
        } else {
            $this->addOption( 'ORDER BY', [
                'il_from' . $sort,
                'il_to' . $sort
            ] );
        }
        $this->addOption( 'LIMIT', $params['limit'] + 1 );
 
        if ( $params['images'] ) {
            $images = [];
            foreach ( $params['images'] as $img ) {
                $title = Title::newFromText( $img );
                if ( !$title || $title->getNamespace() !== NS_FILE ) {
                    $this->addWarning( [ 'apiwarn-notfile', wfEscapeWikiText( $img ) ] );
                } else {
                    $images[] = $title->getDBkey();
                }
            }
            if ( !$images ) {
                // No titles so no results
                return;
            }
            if ( $migrationStage & SCHEMA_COMPAT_READ_NEW ) {
                $this->addWhereFld( 'lt_title', $images );
                $this->addWhereFld( 'lt_namespace', NS_FILE );
            } else {
                $this->addWhereFld( 'il_to', $images );
            }
        }
 
        $this->setVirtualDomain( ImageLinksTable::VIRTUAL_DOMAIN );
        $res = $this->select( __METHOD__ );
        $this->resetVirtualDomain();
 
        if ( $resultPageSet === null ) {
            $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->il_from . '|' . $row->il_to );
                    break;
                }
                $vals = [];
                ApiQueryBase::addTitleInfo( $vals, Title::makeTitle( NS_FILE, $row->il_to ) );
                $fit = $this->addPageSubItem( $row->il_from, $vals );
                if ( !$fit ) {
                    $this->setContinueEnumParameter( 'continue', $row->il_from . '|' . $row->il_to );
                    break;
                }
            }
        } else {
            $titles = [];
            $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->il_from . '|' . $row->il_to );
                    break;
                }
                $titles[] = Title::makeTitle( NS_FILE, $row->il_to );
            }
            $resultPageSet->populateFromTitles( $titles );
        }
    }
 
    public function getCacheMode( $params ) {
        return 'public';
    }
 
    public function getAllowedParams() {
        return [
            'limit' => [
                ParamValidator::PARAM_DEFAULT => 10,
                ParamValidator::PARAM_TYPE => 'limit',
                IntegerDef::PARAM_MIN => 1,
                IntegerDef::PARAM_MAX => ApiBase::LIMIT_BIG1,
                IntegerDef::PARAM_MAX2 => ApiBase::LIMIT_BIG2
            ],
            'continue' => [
                ApiBase::PARAM_HELP_MSG => 'api-help-param-continue',
            ],
            'images' => [
                ParamValidator::PARAM_ISMULTI => true,
            ],
            'dir' => [
                ParamValidator::PARAM_DEFAULT => 'ascending',
                ParamValidator::PARAM_TYPE => [
                    'ascending',
                    'descending'
                ]
            ],
        ];
    }
 
    protected function getExamplesMessages() {
        $title = Title::newMainPage()->getPrefixedText();
        $mp = rawurlencode( $title );
 
        return [
            "action=query&prop=images&titles={$mp}"
                => 'apihelp-query+images-example-simple',
            "action=query&generator=images&titles={$mp}&prop=info"
                => 'apihelp-query+images-example-generator',
        ];
    }
 
    public function getHelpUrls() {
        return 'https://www.mediawiki.org/wiki/Special:MyLanguage/API:Images';
    }
}
 
class_alias( ApiQueryImages::class, 'ApiQueryImages' );