InterwikiHooks.php

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<?php
 
class InterwikiHooks {
    public static function onExtensionFunctions() {
        global $wgInterwikiViewOnly;
 
        if ( $wgInterwikiViewOnly === false ) {
            global $wgAvailableRights, $wgLogTypes, $wgLogActionsHandlers;
 
            // New user right, required to modify the interwiki table through Special:Interwiki
            $wgAvailableRights[] = 'interwiki';
 
            // Set up the new log type - interwiki actions are logged to this new log
            $wgLogTypes[] = 'interwiki';
            // interwiki, iw_add, iw_delete, iw_edit
            $wgLogActionsHandlers['interwiki/*'] = 'InterwikiLogFormatter';
        }
 
        return true;
    }
 
    public static function onInterwikiLoadPrefix( $prefix, &$iwData ) {
        global $wgInterwikiCentralDB;
        // docs/hooks.txt says: Return true without providing an interwiki to continue interwiki search.
        if ( $wgInterwikiCentralDB === null || $wgInterwikiCentralDB === wfWikiID() ) {
            // No global set or this is global, nothing to add
            return true;
        }
        if ( !Language::fetchLanguageName( $prefix ) ) {
            // Check if prefix exists locally and skip
            foreach ( Interwiki::getAllPrefixes( null ) as $id => $localPrefixInfo ) {
                if ( $prefix === $localPrefixInfo['iw_prefix'] ) {
                    return true;
                }
            }
            $dbr = wfGetDB( DB_REPLICA, [], $wgInterwikiCentralDB );
            $res = $dbr->selectRow(
                'interwiki',
                '*',
                [ 'iw_prefix' => $prefix ],
                __METHOD__
            );
            if ( !$res ) {
                return true;
            }
            // Excplicitly make this an array since it's expected to be one
            $iwData = (array)$res;
            // At this point, we can safely return false because we know that we have something
            return false;
        }
        return true;
    }
 
}