ContentModelChangeConstraint.php

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<?php
namespace MediaWiki\EditPage\Constraint;
 
use MediaWiki\Permissions\Authority;
use StatusValue;
use Title;
 
class ContentModelChangeConstraint implements IEditConstraint {
 
    private $performer;
 
    private $title;
 
    private $newContentModel;
 
    private $result;
 
    public function __construct(
        Authority $performer,
        Title $title,
        string $newContentModel
    ) {
        $this->performer = $performer;
        $this->title = $title;
        $this->newContentModel = $newContentModel;
    }
 
    public function checkConstraint(): string {
        if ( $this->newContentModel === $this->title->getContentModel() ) {
            // No change
            $this->result = self::CONSTRAINT_PASSED;
            return self::CONSTRAINT_PASSED;
        }
 
        if ( !$this->performer->isAllowed( 'editcontentmodel' ) ) {
            $this->result = self::CONSTRAINT_FAILED;
            return self::CONSTRAINT_FAILED;
        }
 
        // Make sure the user can edit the page under the new content model too
        $titleWithNewContentModel = clone $this->title;
        $titleWithNewContentModel->setContentModel( $this->newContentModel );
 
        $canEditModel = $this->performer->authorizeWrite(
            'editcontentmodel',
            $titleWithNewContentModel
        );
 
        if (
            !$canEditModel
            || !$this->performer->authorizeWrite( 'edit', $titleWithNewContentModel )
        ) {
            $this->result = self::CONSTRAINT_FAILED;
            return self::CONSTRAINT_FAILED;
        }
 
        $this->result = self::CONSTRAINT_PASSED;
        return self::CONSTRAINT_PASSED;
    }
 
    public function getLegacyStatus(): StatusValue {
        $statusValue = StatusValue::newGood();
 
        if ( $this->result === self::CONSTRAINT_FAILED ) {
            $statusValue->setResult( false, self::AS_NO_CHANGE_CONTENT_MODEL );
        }
 
        return $statusValue;
    }
 
}