class.jetpack-autoupdate.php

<?php

// Update any plugins that have been flagged for automatic updates
// TODO: update themes and core
class Jetpack_Autoupdate {

	private static $instance = null;
	protected $updates_allowed;

	static function init() {
		if ( is_null( self::$instance ) ) {
			self::$instance = new Jetpack_Autoupdate;
		}
		return self::$instance;
	}

	private function __construct() {
		$this->updates_allowed = Jetpack_Options::get_option( 'json_api_full_management', false );

		if ( $this->updates_allowed ) {
			add_filter( 'auto_update_plugin',  array( $this, 'autoupdate_plugin' ), 10, 2 );
			add_filter( 'auto_update_theme',   array( $this, 'autoupdate_theme' ), 10, 2 );
			add_filter( 'auto_update_core',    array( $this, 'autoupdate_core' ), 10, 2 );
		}
	}

	function autoupdate_plugin( $update, $item ) {
		$autoupdate_plugin_list = Jetpack_Options::get_option( 'autoupdate_plugins', array() );
		if ( in_array( $item->plugin, $autoupdate_plugin_list ) ) {
			return true;
		}

		return $update;
	}

	function autoupdate_theme( $update, $item ) {
		$autoupdate_theme_list = Jetpack_Options::get_option( 'autoupdate_themes', array() );
		if ( in_array( $item->theme , $autoupdate_theme_list) ) {
			return true;
		}
		return $update;
	}

	function autoupdate_core( $update, $item ) {
		$autoupdate_core = Jetpack_Options::get_option( 'autoupdate_core', false );
		if ( $autoupdate_core ) {
			return $autoupdate_core;
		}
		return $update;
	}
}
Jetpack_Autoupdate::init();