Select default country based on ip [solution included]

Hi,

I’m managing VAT in B2B for EU customers but most of my customers are from the US. I wanted to make tax calculation made on the ip.
The problem was the default country was not selected and as a consequence, the VAT for EU customers were not showed before making the payment.

Here is my contribution. Not perfect, but it works.

This plugin use goeip.inc available here :
https://github.com/maxmind/geoip-api-php/tree/master/src

and the ip database available here :
https://dev.maxmind.com/geoip/legacy/geolite/
(GeoLite Country)

These 2 files must be dropped in the repository of this plugin.

<?php
/**
 * Plugin Name: Select default country based on ip for wp ecommerce
 * Plugin URI:
 * Description: Select default country based on ip for wp ecommerce
 * Version: 1.0
 * Author: Superman
 * Author URI:
 * License:
 */

function select_default_country_register()
{
	add_action('wpsc_add_item', 'select_default_country_on_add_item', 10, 3 );
}

add_action( 'init', 'select_default_country_register' );

// set the country to the one defined by the ip address
// doesn't work if the user is coming from ipv6
function select_default_country_on_add_item($product_id, $parameters, $wpsc_cart)
{

	$code = wpsc_get_customer_meta('billing_country');
	if ($code === NULL || $code == "")
	{
		include("geoip.inc");
		$gi = geoip_open(realpath(dirname(__FILE__)) . "/GeoIP.dat",GEOIP_STANDARD);
		$code = geoip_country_code_by_addr($gi, $_SERVER['REMOTE_ADDR']);
		geoip_close($gi);
		if (WPSC_Countries::get_country_id($code) != false && $code != "")
		{
			wpsc_update_customer_meta('shipping_country', $code);
			wpsc_update_customer_meta('billing_country', $code);
		}
	}
}

https://www.ads-software.com/plugins/wp-e-commerce/