DoubleRedirectConstraint.php

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<?php
namespace MediaWiki\EditPage\Constraint;
 
use MediaWiki\Content\Content;
use MediaWiki\Linker\LinkTarget;
use MediaWiki\Page\RedirectLookup;
use MediaWiki\Title\Title;
use StatusValue;
 
class DoubleRedirectConstraint implements IEditConstraint {
 
    private bool $allowDoubleRedirects;
    private Content $newContent;
    private Content $originalContent;
    private LinkTarget $title;
    private string $result;
    public bool $willCreateSelfRedirect;
    private ?LinkTarget $doubleRedirectTarget;
    private RedirectLookup $redirectLookup;
 
    public function __construct(
        bool $allowDoubleRedirects,
        Content $newContent,
        Content $originalContent,
        LinkTarget $title,
        RedirectLookup $redirectLookup
    ) {
        $this->allowDoubleRedirects = $allowDoubleRedirects;
        $this->newContent = $newContent;
        $this->originalContent = $originalContent;
        $this->title = $title;
        $this->redirectLookup = $redirectLookup;
    }
 
    public function checkConstraint(): string {
        if ( !$this->allowDoubleRedirects ) {
            $newRedirectTarget = $this->newContent->getRedirectTarget();
 
            if ( $newRedirectTarget !== null && $newRedirectTarget->isRedirect() &&
                !$newRedirectTarget->equals( $this->title ) ) {
 
                $currentTarget = $this->originalContent->getRedirectTarget();
 
                // fail if there was no previous content or the previous content already contained a double redirect
                if ( !$currentTarget || !$currentTarget->isRedirect() ) {
                    $this->result = self::CONSTRAINT_FAILED;
                    $this->doubleRedirectTarget =
                        $this->redirectLookup->getRedirectTarget( $this->newContent->getRedirectTarget() );
                    $this->willCreateSelfRedirect =
                        $this->doubleRedirectTarget != null &&
                        $this->doubleRedirectTarget->isSameLinkAs( $this->title );
 
                    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 ) {
            $realRedirectTarget = $this->redirectLookup->getRedirectTarget( $this->newContent->getRedirectTarget() );
            $realTargetTitle = Title::castFromLinkTarget( $realRedirectTarget );
 
            $statusValue->fatal(
                'edit-constraint-doubleredirect',
                wfEscapeWikiText( $realTargetTitle->getPrefixedText() )
            );
            $statusValue->value = self::AS_DOUBLE_REDIRECT;
        }
 
        return $statusValue;
    }
 
}