wp-updates-theme.php

<?php
// @codingStandardsIgnoreFile
/*
WPUpdates Theme Updater Class
http://wp-updates.com
v2.0

Example Usage:
require_once('wp-updates-theme.php');
new WPUpdatesThemeUpdater_2050( 'http://wp-updates.com/api/2/theme', basename(get_template_directory()) );
*/

if( !class_exists('WPUpdatesThemeUpdater_2050') ) {
    class WPUpdatesThemeUpdater_2050 {

        var $api_url;
    	var $theme_id = 2050;
    	var $theme_slug;
    	var $license_key;

        function __construct( $api_url, $theme_slug, $license_key = null ) {
    		$this->api_url = $api_url;
    		$this->theme_slug = $theme_slug;
	        $this->license_key = $license_key;

    		add_filter( 'pre_set_site_transient_update_themes', array(&$this, 'check_for_update') );

    		// This is for testing only!
    		//set_site_transient('update_themes', null);
    	}

    	function check_for_update( $transient ) {
        	if (empty($transient->checked)) return $transient;

        	$request_args = array(
    		    'id' => $this->theme_id,
    		    'slug' => $this->theme_slug,
    			'version' => $transient->checked[$this->theme_slug]
    		);
    		if ($this->license_key) $request_args['license'] = $this->license_key;

    		$request_string = $this->prepare_request( 'theme_update', $request_args );
    		$raw_response = wp_remote_post( $this->api_url, $request_string );

        	$response = null;
    		if( !is_wp_error($raw_response) && ($raw_response['response']['code'] == 200) )
    			$response = unserialize($raw_response['body']);

    		if( !empty($response) ) // Feed the update data into WP updater
    			$transient->response[$this->theme_slug] = $response;

        	return $transient;
        }

        function prepare_request( $action, $args ) {
    		global $wp_version;

    		return array(
    			'body' => array(
    				'action' => $action,
    				'request' => serialize($args),
    				'api-key' => md5(home_url())
    			),
    			'user-agent' => 'WordPress/'. $wp_version .'; '. home_url()
    		);
    	}

    }
}