SpecialPageAction.php

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<?php
class SpecialPageAction extends FormlessAction {
    public static $actionToSpecialPageMapping = [
        'revisiondelete' => 'Revisiondelete',
        'editchangetags' => 'EditTags',
    ];

    public function getName() {
        $request = $this->getRequest();
        $actionName = $request->getVal( 'action', 'view' );
        // TODO: Shouldn't need to copy-paste this code from Action::getActionName!
        if ( $actionName === 'historysubmit' ) {
            if ( $request->getBool( 'revisiondelete' ) ) {
                $actionName = 'revisiondelete';
            } elseif ( $request->getBool( 'editchangetags' ) ) {
                $actionName = 'editchangetags';
            }
        }

        if ( isset( self::$actionToSpecialPageMapping[$actionName] ) ) {
            return $actionName;
        }

        return 'nosuchaction';
    }

    public function requiresUnblock() {
        return false;
    }

    public function getDescription() {
        return '';
    }

    public function onView() {
        return '';
    }

    public function show() {
        $special = $this->getSpecialPage();
        if ( !$special ) {
            throw new ErrorPageError(
                $this->msg( 'nosuchaction' ), $this->msg( 'nosuchactiontext' ) );
        }

        $special->setContext( $this->getContext() );
        $special->getContext()->setTitle( $special->getPageTitle() );
        $special->run( '' );
    }

    public function doesWrites() {
        $special = $this->getSpecialPage();

        return $special ? $special->doesWrites() : false;
    }

    protected function getSpecialPage() {
        $action = $this->getName();
        if ( $action === 'nosuchaction' ) {
            return null;
        }

        // map actions to (whitelisted) special pages
        return SpecialPageFactory::getPage( self::$actionToSpecialPageMapping[$action] );
    }
}