UserNamePrefixSearch.php

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<?php
namespace MediaWiki\User;
 
use InvalidArgumentException;
use MediaWiki\Permissions\Authority;
use Wikimedia\Rdbms\ILoadBalancer;
 
class UserNamePrefixSearch {
 
    public const AUDIENCE_PUBLIC = 'public';
 
    private $loadBalancer;
 
    private $userNameUtils;
 
    public function __construct(
        ILoadBalancer $loadBalancer,
        UserNameUtils $userNameUtils
    ) {
        $this->loadBalancer = $loadBalancer;
        $this->userNameUtils = $userNameUtils;
    }
 
    public function search( $audience, string $search, int $limit, int $offset = 0 ): array {
        if ( $audience !== self::AUDIENCE_PUBLIC &&
            !( $audience instanceof Authority )
        ) {
            throw new InvalidArgumentException(
                '$audience must be AUDIENCE_PUBLIC or an Authority object'
            );
        }
 
        // Invalid user names are treated as empty strings
        $prefix = $this->userNameUtils->getCanonical( $search ) ?: '';
 
        $dbr = $this->loadBalancer->getConnectionRef( DB_REPLICA );
 
        $tables = [ 'user' ];
        $conds = [ 'user_name ' . $dbr->buildLike( $prefix, $dbr->anyString() ) ];
        $joinConds = [];
 
        // Filter out hidden user names
        if ( $audience === self::AUDIENCE_PUBLIC || !$audience->isAllowed( 'hideuser' ) ) {
            $tables[] = 'ipblocks';
            $conds['ipb_deleted'] = [ 0, null ];
            $joinConds['ipblocks'] = [ 'LEFT JOIN', 'user_id=ipb_user' ];
        }
 
        $res = $dbr->selectFieldValues(
            $tables,
            'user_name',
            $conds,
            __METHOD__,
            [
                'LIMIT' => $limit,
                'ORDER BY' => 'user_name',
                'OFFSET' => $offset
            ],
            $joinConds
        );
 
        return $res;
    }
}