populateInterwiki.php

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<?php

use MediaWiki\MediaWikiServices;

require_once __DIR__ . '/Maintenance.php';

class PopulateInterwiki extends Maintenance {

    private $source;

    public function __construct() {
        parent::__construct();

        $this->addDescription( <<<TEXT
This script will populate the interwiki table, pulling in interwiki links that are used on Wikipedia
or another MediaWiki wiki.

When the script has finished, it will make a note of this in the database, and will not run again
without the --force option.

--source parameter is the url for the source wiki api, such as "https://en.wikipedia.org/w/api.php"
(the default) from which the script fetches the interwiki data and uses here to populate
the interwiki database table.
TEXT
        );

        $this->addOption( 'source', 'Source wiki for interwiki table, such as '
            . 'https://en.wikipedia.org/w/api.php (the default)', false, true );
        $this->addOption( 'force', 'Run regardless of whether the database says it has '
            . 'been run already.' );
    }

    public function execute() {
        $force = $this->hasOption( 'force' );
        $this->source = $this->getOption( 'source', 'https://en.wikipedia.org/w/api.php' );

        $data = $this->fetchLinks();

        if ( $data === false ) {
            $this->error( "Error during fetching data." );
        } else {
            $this->doPopulate( $data, $force );
        }
    }

    protected function fetchLinks() {
        $url = wfArrayToCgi( [
            'action' => 'query',
            'meta' => 'siteinfo',
            'siprop' => 'interwikimap',
            'sifilteriw' => 'local',
            'format' => 'json'
        ] );

        if ( !empty( $this->source ) ) {
            $url = rtrim( $this->source, '?' ) . '?' . $url;
        }

        $json = MediaWikiServices::getInstance()->getHttpRequestFactory()->get( $url );
        $data = json_decode( $json, true );

        if ( is_array( $data ) ) {
            return $data['query']['interwikimap'];
        } else {
            return false;
        }
    }

    protected function doPopulate( array $data, $force ) {
        $dbw = wfGetDB( DB_MASTER );

        if ( !$force ) {
            $row = $dbw->selectRow(
                'updatelog',
                '1',
                [ 'ul_key' => 'populate interwiki' ],
                __METHOD__
            );

            if ( $row ) {
                $this->output( "Interwiki table already populated.  Use php " .
                    "maintenance/populateInterwiki.php\n--force from the command line " .
                    "to override.\n" );
                return true;
            }
        }

        $lookup = MediaWikiServices::getInstance()->getInterwikiLookup();
        foreach ( $data as $d ) {
            $prefix = $d['prefix'];

            $row = $dbw->selectRow(
                'interwiki',
                '1',
                [ 'iw_prefix' => $prefix ],
                __METHOD__
            );

            if ( !$row ) {
                $dbw->insert(
                    'interwiki',
                    [
                        'iw_prefix' => $prefix,
                        'iw_url' => $d['url'],
                        'iw_local' => 1
                    ],
                    __METHOD__,
                    [ 'IGNORE' ]
                );
            }

            $lookup->invalidateCache( $prefix );
        }

        $this->output( "Interwiki links are populated.\n" );

        return true;
    }

}

$maintClass = PopulateInterwiki::class;
require_once RUN_MAINTENANCE_IF_MAIN;