extension to get JSON(p) from Bolt. use as `/json/pages?limit=1&callback=c`

extension.php

<?php
// JsonInterface Extension for Bolt, by Bob den Otter

namespace JsonInterface;

use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\Response;

class Extension extends \Bolt\BaseExtension
{


    /**
     * Info block for Sitemap Extension.
     */
    function info()
    {

        $data = array(
            'name' => "JsonInterface",
            'description' => "An extension to output JSON data structures of your content for your Bolt website.",
            'author' => "Bob den Otter",
            'link' => "http://bolt.cm",
            'version' => "0.8",
            'required_bolt_version' => "1.2.0",
            'highest_bolt_version' => "1.2.0",
            'type' => "General",
            'first_releasedate' => "2013-07-19",
            'latest_releasedate' => "2013-09-04",
            'dependancies' => "",
            'priority' => 10
        );

        return $data;

    }

    /**
     * Initialize Sitemap. Called during bootstrap phase.
     */
    function initialize()
    {

        // Set up the routes for the sitemap..
        $this->app->match("/json", array($this, 'json'));

    }

    public function json()
    {

        // Make sure we output no extra 'fluff'..
        $this->app['extensions']->clearSnippetQueue();
        $this->app['extensions']->disableJquery();
        $this->app['debugbar'] = false;

        $notice = "OK";

        //\util::var_dump($_GET);

        if (!empty($_GET['contenttype'])) {
            $contenttype = $this->app['storage']->getContenttype($_GET['contenttype']);
            if (empty($contenttype)) {
                $notice = "Contenttype '". safeString($_GET['contenttype']) . "' does not exist.";
            }
        } else {
            $notice = "You should pass a valid contenttype slug.";
        }

        if (!empty($_GET['limit'])) {
            $limit = intval($_GET['limit']);
        } else {
            $limit = 10;
        }

        if (!empty($_GET['order'])) {
            $order = safeString($_GET['order']);
        } else {
            $order = "id";
        }

        $records = $this->app['storage']->getContent(
                $contenttype['slug'],
                array('limit' => $limit, 'order' => $order)
            );

        $content = array('notice' => '');

        if (!empty($records)) {

            foreach($records as $record) {
                $content['records'][ $record->id ] = array(
                    "values" => $record->values,
                    "taxonomy" => $record->taxonomy,
                    "relation" => $record->relation
                );
            }

        } else {

            $notice = "No records matched or no records present";

        }

        $content['notice'] = $notice;


        $headers = array('Content-Type' => 'application/javascript; charset=utf-8');

        if (!empty($_GET['callback'])) {
            $body = sprintf("%s(%s);", safeString($_GET['callback']) , json_encode($content));
        } else {
            $body = json_encode($content);

        }


        return new Response($body, 200, $headers);

    }


}