ApiQueryExternalLinks.php

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<?php
namespace MediaWiki\Api;
 
use MediaWiki\Deferred\LinksUpdate\ExternalLinksTable;
use MediaWiki\ExternalLinks\LinkFilter;
use MediaWiki\Parser\Parser;
use MediaWiki\Title\Title;
use MediaWiki\Utils\UrlUtils;
use Wikimedia\ParamValidator\ParamValidator;
use Wikimedia\ParamValidator\TypeDef\IntegerDef;
use Wikimedia\Rdbms\IExpression;
use Wikimedia\Rdbms\LikeValue;
 
class ApiQueryExternalLinks extends ApiQueryBase {
 
    public function __construct(
        ApiQuery $query,
        string $moduleName,
        private readonly UrlUtils $urlUtils,
    ) {
        parent::__construct( $query, $moduleName, 'el' );
    }
 
    public function execute() {
        $pages = $this->getPageSet()->getGoodPages();
        if ( $pages === [] ) {
            return;
        }
 
        $params = $this->extractRequestParams();
        $db = $this->getDB();
 
        $query = $params['query'];
        $protocol = LinkFilter::getProtocolPrefix( $params['protocol'] );
 
        $fields = [ 'el_from' ];
        $fields[] = 'el_to_domain_index';
        $fields[] = 'el_to_path';
        $continueField = 'el_to_domain_index';
        $this->addFields( $fields );
 
        $this->addTables( 'externallinks' );
        $this->addWhereFld( 'el_from', array_keys( $pages ) );
 
        if ( $query !== null && $query !== '' ) {
            // Normalize query to match the normalization applied for the externallinks table
            $query = Parser::normalizeLinkUrl( $query );
 
            $conds = LinkFilter::getQueryConditions( $query, [
                'protocol' => $protocol,
                'oneWildcard' => true,
                'db' => $db
            ] );
            if ( !$conds ) {
                $this->dieWithError( 'apierror-badquery' );
            }
            $this->addWhere( $conds );
        } else {
            if ( $protocol !== null ) {
                $this->addWhere(
                    $db->expr( $continueField, IExpression::LIKE, new LikeValue( "$protocol", $db->anyString() ) )
                );
            }
        }
 
        $orderBy = [ 'el_id' ];
 
        $this->addOption( 'ORDER BY', $orderBy );
        $this->addFields( $orderBy ); // Make sure
 
        $this->addOption( 'LIMIT', $params['limit'] + 1 );
 
        if ( $params['continue'] !== null ) {
            $cont = $this->parseContinueParamOrDie( $params['continue'],
                array_fill( 0, count( $orderBy ), 'string' ) );
            $conds = array_combine( $orderBy, array_map( 'rawurldecode', $cont ) );
            $this->addWhere( $db->buildComparison( '>=', $conds ) );
        }
 
        $this->setVirtualDomain( ExternalLinksTable::VIRTUAL_DOMAIN );
        $res = $this->select( __METHOD__ );
        $this->resetVirtualDomain();
 
        $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->setContinue( $orderBy, $row );
                break;
            }
            $entry = [];
            $to = LinkFilter::reverseIndexes( $row->el_to_domain_index ) . $row->el_to_path;
            // expand protocol-relative urls
            if ( $params['expandurl'] ) {
                $to = (string)$this->urlUtils->expand( $to, PROTO_CANONICAL );
            }
            ApiResult::setContentValue( $entry, 'url', $to );
            $fit = $this->addPageSubItem( $row->el_from, $entry );
            if ( !$fit ) {
                $this->setContinue( $orderBy, $row );
                break;
            }
        }
    }
 
    private function setContinue( array $orderBy, \stdClass $row ) {
        $fields = [];
        foreach ( $orderBy as $field ) {
            $fields[] = strtr( $row->$field, [ '%' => '%25', '|' => '%7C' ] );
        }
        $this->setContinueEnumParameter( 'continue', implode( '|', $fields ) );
    }
 
    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',
            ],
            'protocol' => [
                ParamValidator::PARAM_TYPE => LinkFilter::prepareProtocols(),
                ParamValidator::PARAM_DEFAULT => '',
            ],
            'query' => null,
            'expandurl' => [
                ParamValidator::PARAM_TYPE => 'boolean',
                ParamValidator::PARAM_DEFAULT => false,
                ParamValidator::PARAM_DEPRECATED => true,
            ],
        ];
    }
 
    protected function getExamplesMessages() {
        $title = Title::newMainPage()->getPrefixedText();
        $mp = rawurlencode( $title );
 
        return [
            "action=query&prop=extlinks&titles={$mp}"
                => 'apihelp-query+extlinks-example-simple',
        ];
    }
 
    public function getHelpUrls() {
        return 'https://www.mediawiki.org/wiki/Special:MyLanguage/API:Extlinks';
    }
}
 
class_alias( ApiQueryExternalLinks::class, 'ApiQueryExternalLinks' );