CheckSignatures.php

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<?php
class CheckSignatures extends Maintenance {
 
    public function __construct() {
        parent::__construct();
        $this->addDescription( 'List users with invalid signatures' );
        $this->setBatchSize( 1000 );
    }
 
    public function execute() {
        $dbr = $this->getReplicaDB();
        $userFactory = $this->getServiceContainer()->getUserIdentityLookup();
        $userOptions = $this->getServiceContainer()->getUserOptionsLookup();
        $signatureValidatorFactory = $this->getServiceContainer()->getSignatureValidatorFactory();
        $contentLanguage = $this->getServiceContainer()->getContentLanguage();
 
        $count = 0;
        $maxUserId = 0;
        do {
            // List users who may have a signature that needs validation
            $res = $dbr->newSelectQueryBuilder()
                ->from( 'user_properties' )
                ->select( 'up_user' )
                ->where( [ 'up_property' => 'fancysig' ] )
                ->andWhere( $dbr->expr( 'up_user', '>', $maxUserId ) )
                ->orderBy( [ 'up_property', 'up_user' ] )
                ->limit( $this->getBatchSize() )
                ->fetchResultSet();
 
            foreach ( $res as $row ) {
                // Double-check effective preferences and check validation
                $user = $userFactory->getUserIdentityByUserId( $row->up_user );
                if ( !$user ) {
                    continue;
                }
                $signature = $userOptions->getOption( $user, 'nickname' );
                $useFancySig = $userOptions->getBoolOption( $user, 'fancysig' );
                if ( $useFancySig && $signature !== '' ) {
                    $parserOpts = new ParserOptions( $user, $contentLanguage );
                    $validator = $signatureValidatorFactory->newSignatureValidator( $user, null, $parserOpts );
                    $signatureErrors = $validator->validateSignature( $signature );
                    if ( $signatureErrors ) {
                        $count++;
                        $this->output( $user->getName() . "\n" );
                    }
                }
 
                $maxUserId = $row->up_user;
            }
        } while ( $res->numRows() );
 
        $this->output( "-- $count invalid signatures --\n" );
    }
}
 
$maintClass = CheckSignatures::class;