json.php

<?php
/**
 * Copyright (c) 2011 Bart Visscher <bartv@thisnet.nl>
 * This file is licensed under the Affero General Public License version 3 or
 * later.
 * See the COPYING-README file.
 */

class OC_JSON{
	static protected $send_content_type_header = false;
	/**
	 * set Content-Type header to jsonrequest
	 */
	public static function setContentTypeHeader($type='application/json') {
		if (!self::$send_content_type_header) {
			// We send json data
			header( 'Content-Type: '.$type . '; charset=utf-8');
			self::$send_content_type_header = true;
		}
	}

	/**
	* Check if the app is enabled, send json error msg if not
	*/
	public static function checkAppEnabled($app) {
		if( !OC_App::isEnabled($app)) {
			$l = OC_L10N::get('lib');
			self::error(array( 'data' => array( 'message' => $l->t('Application is not enabled') )));
			exit();
		}
	}

	/**
	* Check if the user is logged in, send json error msg if not
	*/
	public static function checkLoggedIn() {
		if( !OC_User::isLoggedIn()) {
			$l = OC_L10N::get('lib');
			self::error(array( 'data' => array( 'message' => $l->t('Authentication error') )));
			exit();
		}
	}

	/**
	 * @brief Check an ajax get/post call if the request token is valid.
	 * @return json Error msg if not valid.
	 */
	public static function callCheck() {
		if( !OC_Util::isCallRegistered()) {
			$l = OC_L10N::get('lib');
			self::error(array( 'data' => array( 'message' => $l->t('Token expired. Please reload page.') )));
			exit();
		}
	}

	/**
	* Check if the user is a admin, send json error msg if not
	*/
	public static function checkAdminUser() {
		if( !OC_User::isAdminUser(OC_User::getUser())) {
			$l = OC_L10N::get('lib');
			self::error(array( 'data' => array( 'message' => $l->t('Authentication error') )));
			exit();
		}
	}

	/**
	* Check if the user is a subadmin, send json error msg if not
	*/
	public static function checkSubAdminUser() {