UserNotLoggedIn.php

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<?php
class UserNotLoggedIn extends ErrorPageError {

    public function __construct(
        $reasonMsg = 'exception-nologin-text',
        $titleMsg = 'exception-nologin',
        $params = []
    ) {
        parent::__construct( $titleMsg, $reasonMsg, $params );
    }

    public function report() {
        // If an unsupported message is used, don't try redirecting to Special:Userlogin,
        // since the message may not be compatible.
        if ( !in_array( $this->msg, LoginHelper::getValidErrorMessages() ) ) {
            parent::report();
        }

        // Message is valid. Redirec to Special:Userlogin

        $context = RequestContext::getMain();

        $output = $context->getOutput();
        $query = $context->getRequest()->getValues();
        // Title will be overridden by returnto
        unset( $query['title'] );
        // Redirect to Special:Userlogin
        $output->redirect( SpecialPage::getTitleFor( 'Userlogin' )->getFullURL( [
            // Return to this page when the user logs in
            'returnto' => $context->getTitle()->getFullText(),
            'returntoquery' => wfArrayToCgi( $query ),
            'warning' => $this->msg,
        ] ) );

        $output->output();
    }
}