HTMLUserTextField.php

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<?php

use MediaWiki\Widget\UserInputWidget;

class HTMLUserTextField extends HTMLTextField {
    public function __construct( $params ) {
        $params = wfArrayPlus2d( $params, [
                'exists' => false,
                'ipallowed' => false,
                'iprange' => false,
                'iprangelimits' => [
                    'IPv4' => '16',
                    'IPv6' => '32',
                ],
            ]
        );

        parent::__construct( $params );
    }

    public function validate( $value, $alldata ) {
        // Default value (from getDefault()) is null, User::newFromName() expects a string
        if ( $value === null ) {
            $value = '';
        }

        // check, if a user exists with the given username
        $user = User::newFromName( $value, false );
        $rangeError = null;

        if ( !$user ) {
            return $this->msg( 'htmlform-user-not-valid', $value );
        } elseif (
            // check, if the user exists, if requested
            ( $this->mParams['exists'] && $user->getId() === 0 ) &&
            // check, if the username is a valid IP address, otherwise save the error message
            !( $this->mParams['ipallowed'] && IP::isValid( $value ) ) &&
            // check, if the username is a valid IP range, otherwise save the error message
            !( $this->mParams['iprange'] && ( $rangeError = $this->isValidIPRange( $value ) ) === true )
        ) {
            if ( is_string( $rangeError ) ) {
                return $rangeError;
            }
            return $this->msg( 'htmlform-user-not-exists', $user->getName() );
        }

        return parent::validate( $value, $alldata );
    }

    protected function isValidIPRange( $value ) {
        $cidrIPRanges = $this->mParams['iprangelimits'];

        if ( !IP::isValidRange( $value ) ) {
            return false;
        }

        list( $ip, $range ) = explode( '/', $value, 2 );

        if (
            ( IP::isIPv4( $ip ) && $cidrIPRanges['IPv4'] == 32 ) ||
            ( IP::isIPv6( $ip ) && $cidrIPRanges['IPv6'] == 128 )
        ) {
            // Range block effectively disabled
            return $this->msg( 'ip_range_toolow' )->parse();
        }

        if (
            ( IP::isIPv4( $ip ) && $range > 32 ) ||
            ( IP::isIPv6( $ip ) && $range > 128 )
        ) {
            // Dodgy range
            return $this->msg( 'ip_range_invalid' )->parse();
        }

        if ( IP::isIPv4( $ip ) && $range < $cidrIPRanges['IPv4'] ) {
            return $this->msg( 'ip_range_exceeded', $cidrIPRanges['IPv4'] )->parse();
        }

        if ( IP::isIPv6( $ip ) && $range < $cidrIPRanges['IPv6'] ) {
            return $this->msg( 'ip_range_exceeded', $cidrIPRanges['IPv6'] )->parse();
        }

        return true;
    }

    protected function getInputWidget( $params ) {
        return new UserInputWidget( $params );
    }

    protected function shouldInfuseOOUI() {
        return true;
    }

    protected function getOOUIModules() {
        return [ 'mediawiki.widgets.UserInputWidget' ];
    }

    public function getInputHtml( $value ) {
        // add the required module and css class for user suggestions in non-OOUI mode
        $this->mParent->getOutput()->addModules( 'mediawiki.userSuggest' );
        $this->mClass .= ' mw-autocomplete-user';

        // return parent html
        return parent::getInputHTML( $value );
    }
}