DefaultTextConstraint.php

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<?php
namespace MediaWiki\EditPage\Constraint;
 
use MediaWiki\EditPage\EditPageStatus;
use MediaWiki\Title\Title;
use Wikimedia\Message\MessageValue;
 
class DefaultTextConstraint extends EditConstraint {
 
    public function __construct(
        private readonly Title $title,
        private readonly bool $allowBlank,
        private readonly string $userProvidedText,
        private readonly string $submitButtonLabel,
    ) {
    }
 
    public function checkConstraint(): EditPageStatus {
        $defaultMessageText = $this->title->getDefaultMessageText();
        if ( $this->title->getNamespace() === NS_MEDIAWIKI && $defaultMessageText !== false ) {
            $defaultText = $defaultMessageText;
        } else {
            $defaultText = '';
        }
 
        if ( !$this->allowBlank && $this->userProvidedText === $defaultText ) {
            return EditPageStatus::newGood( self::AS_BLANK_ARTICLE )
                ->setOK( false )
                ->warning( 'blankarticle', MessageValue::new( $this->submitButtonLabel ) );
        }
        return EditPageStatus::newGood();
    }
 
}