DefaultTextConstraint.php

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<?php
namespace MediaWiki\EditPage\Constraint;
 
use MediaWiki\Page\PageReference;
use MediaWiki\PageEdit\PageEditStatus;
use MediaWiki\ShadowPage\ShadowPageLoader;
use Wikimedia\Message\MessageSpecifier;
 
class DefaultTextConstraint extends EditConstraint {
 
    public function __construct(
        private readonly ShadowPageLoader $shadowPageLoader,
        private readonly PageReference $title,
        private readonly bool $allowBlank,
        private readonly string $userProvidedText,
        private readonly MessageSpecifier $submitButtonLabel,
    ) {
    }
 
    public function checkConstraint(): PageEditStatus {
        $defaultContent = $this->shadowPageLoader->get( $this->title )?->getPreloadContent();
        // TODO: check whether JSON reserialization causes a mismatch
        $defaultText = $defaultContent?->serialize() ?? '';
        if ( !$this->allowBlank && $this->userProvidedText === $defaultText ) {
            return PageEditStatus::newGood( self::AS_BLANK_ARTICLE )
                ->setOK( false )
                ->warning( 'blankarticle', $this->submitButtonLabel );
        }
        return PageEditStatus::newGood();
    }
 
}