RedirectSpecialArticle.php

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<?php
abstract class RedirectSpecialArticle extends RedirectSpecialPage {
 
    public function __construct( $name ) {
        parent::__construct( $name );
        $redirectParams = [
            'action',
            'redirect', 'rdfrom',
            # Options for preloaded edits
            'preload', 'preloadparams', 'editintro', 'preloadtitle', 'summary', 'nosummary',
            # Options for overriding user settings
            'preview', 'minor', 'watchthis',
            # Options for history/diffs
            'section', 'oldid', 'diff', 'dir',
            'limit', 'offset', 'feed',
            # Misc options
            'redlink',
            # Options for action=raw; missing ctype can break JS or CSS in some browsers
            'ctype', 'maxage', 'smaxage',
        ];
 
        $this->getHookRunner()->onRedirectSpecialArticleRedirectParams( $redirectParams );
        $this->mAllowedRedirectParams = $redirectParams;
    }
 
    public function getRedirectQuery( $subpage ) {
        $query = parent::getRedirectQuery( $subpage );
        $title = $this->getRedirect( $subpage );
        // Avoid double redirect for action=edit&redlink=1 for existing pages
        // (compare to the check in EditPage::edit)
        if (
            $query && isset( $query['action'] ) && isset( $query['redlink'] ) &&
            ( $query['action'] === 'edit' || $query['action'] === 'submit' ) &&
            (bool)$query['redlink'] &&
            $title instanceof Title &&
            $title->exists()
        ) {
            return false;
        }
        return $query;
    }
 
}