<?php
  
  /**
   * ownCloud
   *
   * @author Thomas Müller
   * @copyright 2013 Thomas Müller <thomas.mueller@tmit.eu>
   *
   * @license AGPL3
   */

  class OC_Connector_Sabre_MaintenancePlugin extends \Sabre\DAV\ServerPlugin

  {
  
  	/**
  	 * Reference to main server object
  	 *

  	 * @var \Sabre\DAV\Server

  	 */
  	private $server;
  
  	/**
  	 * This initializes the plugin.
  	 *

  	 * This function is called by \Sabre\DAV\Server, after

  	 * addPlugin is called.
  	 *
  	 * This method should set up the required event subscriptions.
  	 *

  	 * @param \Sabre\DAV\Server $server

  	 * @return void
  	 */

  	public function initialize(\Sabre\DAV\Server $server) {

  
  		$this->server = $server;
  		$this->server->subscribeEvent('beforeMethod', array($this, 'checkMaintenanceMode'), 10);
  	}
  
  	/**
  	 * This method is called before any HTTP method and returns http status code 503
  	 * in case the system is in maintenance mode.
  	 *

  	 * @throws \Sabre\DAV\Exception\ServiceUnavailable

  	 * @internal param string $method
  	 * @return bool
  	 */
  	public function checkMaintenanceMode() {
  		if (OC_Config::getValue('maintenance', false)) {

  			throw new \Sabre\DAV\Exception\ServiceUnavailable();

  		}
  		if (OC::checkUpgrade(false)) {

  			throw new \Sabre\DAV\Exception\ServiceUnavailable('Upgrade needed');

  		}
  
  		return true;
  	}
  }