<?php
/*
Plugin Name: Check Updates
Plugin URI: http://konstruktors.com/blog/
Description: Plugins hosted outside wordpress.org should also enjoy the automatic updates.
Version: 0.1
Author: Kaspars Dambis
Author URI: http://konstruktors.com/blog/
*/

add_filter('transient_update_plugins', 'check_for_update');

function check_for_update($checked_data) {
	global $wp_version;
	
	$api_url = 'http://api.example.com/';
	$plugin_base = plugin_basename(dirname(__FILE__));
	
	// Check for updates ONLY ONCE per hour
	if ($checked_data->last_checked) {
		if ((time() - $checked_data->last_checked) < 3600) {
			// uncomment this to avoid checking for updates on every page load
			// return $checked_data;
		}
	}
	
	// Start checking for an update
	$send_for_check = array(
		'body' => array(
			'name' => $plugin_base,
			'version' => $checked_data->checked[$plugin_base .'/'. $plugin_base .'.php'],
			'api-key' => '111'
		),
		'user-agent' => 'WordPress/' . $wp_version . '; ' . get_bloginfo('url')
	);

	$raw_response = wp_remote_post($api_url, $send_for_check);
	
	if (!is_wp_error($raw_response) && ($raw_response['response']['code'] == 200))
		$response = unserialize($raw_response['body']);
	
	if (!empty($response['package'])) {
		$update_data = new stdClass;
		$update_data->slug = $plugin_base;
		$update_data->new_version = $response['version'];
		$update_data->url = 'http://konstruktors.com/blog/';
		$update_data->package = $response['package'];
		
		// Feed the update data into WP updater
		$checked_data->response[$plugin_base .'/'. $plugin_base .'.php'] = $update_data;
	}
	
	return $checked_data;
}

//if (is_admin())
//	$current = get_transient('update_plugins');

?>