SelfRedirectConstraint.php

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<?php
namespace MediaWiki\EditPage\Constraint;
 
use MediaWiki\Content\Content;
use MediaWiki\Linker\LinkTarget;
use StatusValue;
 
class SelfRedirectConstraint implements IEditConstraint {
 
    private bool $allowSelfRedirect;
    private Content $newContent;
    private Content $originalContent;
    private LinkTarget $title;
    private string $result;
 
    public function __construct(
        bool $allowSelfRedirect,
        Content $newContent,
        Content $originalContent,
        LinkTarget $title
    ) {
        $this->allowSelfRedirect = $allowSelfRedirect;
        $this->newContent = $newContent;
        $this->originalContent = $originalContent;
        $this->title = $title;
    }
 
    public function checkConstraint(): string {
        if ( !$this->allowSelfRedirect
            && $this->newContent->isRedirect()
            && $this->newContent->getRedirectTarget()->equals( $this->title )
        ) {
            // T29683 If the page already redirects to itself, don't warn.
            $currentTarget = $this->originalContent->getRedirectTarget();
            if ( !$currentTarget || !$currentTarget->equals( $this->title ) ) {
                $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->fatal( 'selfredirect' );
            $statusValue->value = self::AS_SELF_REDIRECT;
        }
        return $statusValue;
    }
 
}