DisabledSpecialPage.php

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<?php
class DisabledSpecialPage extends UnlistedSpecialPage {
 
    protected $errorMessage;
 
    public static function getCallback( $name, $errorMessage = null ) {
        return function () use ( $name, $errorMessage ) {
            return new DisabledSpecialPage( $name, $errorMessage );
        };
    }
 
    public function __construct( $name, $errorMessage = null ) {
        parent::__construct( $name );
        $this->errorMessage = $errorMessage ?: 'disabledspecialpage-disabled';
    }
 
    public function execute( $subPage ) {
        $this->setHeaders();
        $this->outputHeader();
 
        $error = Html::rawElement( 'div', [
            'class' => 'error',
        ], $this->msg( $this->errorMessage )->parseAsBlock() );
        $this->getOutput()->addHTML( $error );
    }
 
}