MediaWiki:Common.js

/* Any JavaScript here will be loaded for all users on every page load. */
(function () {
    function getAmazonLink(countryCode, asin) {
        switch (countryCode) {
            case 'GB': return 'https://www.amazon.co.uk/dp/'+asin;
            case 'DE': return 'https://www.amazon.de/dp/'+asin;
            case 'JP': return 'https://www.amazon.co.jp/dp/'+asin;
            case 'CA': return 'https://www.amazon.ca/dp/'+asin;
            case 'AU': return 'https://www.amazon.com.au/dp/'+asin;
            case 'FR': return 'https://www.amazon.fr/dp/'+asin;
            default: return 'https://www.amazon.com/dp/'+asin;
        }
    }

    function updateAmazonLinks() {
        var amazonLinks = document.querySelectorAll('a[data-amazon-asin]');
        if (amazonLinks.length > 0) {

            fetch('https://ip-api.com/json/')
                .then(response => response.json())
                .then(data => {
                    var region = getAmazonRegion(data.countryCode);
                    amazonLinks.forEach(function(link) {
                        var finalUrl = getAmazonLink(region, link.getAttribute('data-amazon-asin'));
                        link.setAttribute('href', finalUrl);
                    });
                })
                .catch(console.error);
        }
    }
    document.addEventListener('DOMContentLoaded', updateAmazonLinks);
})();