ViewAction.php

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<?php
use MediaWiki\MediaWikiServices;
 
class ViewAction extends FormlessAction {
 
    public function getName() {
        return 'view';
    }
 
    public function onView() {
        return null;
    }
 
    public function show() {
        $config = $this->context->getConfig();
 
        // Emit deprecated hook warnings.
        // We do this only in the view action so that it reliably shows up in
        // the debug toolbar without unduly impacting the performance of API and
        // ResourceLoader requests.
        MediaWikiServices::getInstance()->getHookContainer()->emitDeprecationWarnings();
 
        if (
            $config->get( 'DebugToolbar' ) == false && // don't let this get stuck on pages
            $this->getWikiPage()->checkTouched() // page exists and is not a redirect
        ) {
            // Include any redirect in the last-modified calculation
            $redirFromTitle = $this->getArticle()->getRedirectedFrom();
            if ( !$redirFromTitle ) {
                $touched = $this->getWikiPage()->getTouched();
            } elseif ( $config->get( 'MaxRedirects' ) <= 1 ) {
                $touched = max(
                    $this->getWikiPage()->getTouched(),
                    $redirFromTitle->getTouched()
                );
            } else {
                // Don't bother following the chain and getting the max mtime
                $touched = null;
            }
 
            // Send HTTP 304 if the IMS matches or otherwise set expiry/last-modified headers
            if ( $touched && $this->getOutput()->checkLastModified( $touched ) ) {
                wfDebug( __METHOD__ . ": done 304" );
                return;
            }
        }
 
        $this->getArticle()->view();
    }
}