woocommerce/assets/js/frontend/geolocation.js

/*global wc_geolocation_params */
jQuery( function( $ ) {

	var this_page = window.location.toString();

	var $append_hashes = function() {
		if ( wc_geolocation_params.hash ) {
			$( 'a[href^="' + wc_geolocation_params.home_url + '"]:not(a[href*="v="]), a[href^="/"]:not(a[href*="v="])' ).each( function() {
				var $this = $( this );
				var href  = $this.attr( 'href' );

				if ( href.indexOf( '?' ) > 0 ) {
					$this.attr( 'href', href + '&v=' + wc_geolocation_params.hash );
				} else {
					$this.attr( 'href', href + '?v=' + wc_geolocation_params.hash );
				}
			});
		}
	};

	var $geolocation_redirect = function( hash ) {
		if ( this_page.indexOf( '?v=' ) > 0 || this_page.indexOf( '&v=' ) > 0 ) {
			this_page = this_page.replace( /v=[^&]+/, 'v=' + hash );
		} else if ( this_page.indexOf( '?' ) > 0 ) {
			this_page = this_page + '&v=' + hash;
		} else {
			this_page = this_page + '?v=' + hash;
		}

		window.location = this_page;
	};

	var $geolocate_customer = {
		url: wc_geolocation_params.wc_ajax_url.toString().replace( '%%endpoint%%', 'get_customer_location' ),
		type: 'GET',
		success: function( response ) {
			if ( response.success && response.data.hash && response.data.hash !== wc_geolocation_params.hash ) {
				$geolocation_redirect( response.data.hash );
			}
		}
	};

	if ( '1' !== wc_geolocation_params.is_checkout ) {
		$.ajax( $geolocate_customer );
	}

	$( document.body ).on( 'added_to_cart', function() {
		$append_hashes();
	});

	$append_hashes();
});