// ==UserScript==// @name          Amazon International Links// @description   Add international links to Amazon product pages// @author        chocolateboy// @copyright     chocolateboy// @version       3.7.0// @namespace     https://github.com/chocolateboy/userscripts// @license       GPL// @include       https://smile.amazon.tld/*// @include       https://www.amazon.com.be/*// @include       https://www.amazon.tld/*// @require       https://code.jquery.com/jquery-3.6.1.slim.min.js// @require       https://cdn.jsdelivr.net/gh/sizzlemctwizzle/GM_config@43fd0fe4de1166f343883511e53546e87840aeaf/gm_config.js// @require       https://cdn.jsdelivr.net/gh/aduth/hijinks@b4fbbd462c98248c585659fcc35a50b00fec147c/hijinks.min.js// @grant         GM_registerMenuCommand// @grant         GM_getValue// @grant         GM_setValue// ==/UserScript==// XXX GM_getValue and GM_setValue are used by GM_config/*** further reading:**     https://helpful.knobs-dials.com/index.php/Amazon_notes#Links*//*********************** Constants ********************************//** a map from the Amazon TLD to the corresponding two-letter country code** XXX technically, UK should be GB: https://en.wikipedia.org/wiki/ISO_3166-1_alpha-2*/const SITES = {'com.au': 'AU', // Australia'com.be': 'BE', // Belgium'com.br': 'BR', // Brazil'ca':     'CA', // Canada'cn':     'CN', // #####'fr':     'FR', // France'de':     'DE', // Germany'in':     'IN', // India'it':     'IT', // Italy'co.jp':  'JP', // Japan'com.mx': 'MX', // Mexico'nl':     'NL', // Netherlands'es':     'ES', // Spain'se':     'SE', // Sweden'com.tr': 'TR', // Turkey'ae':     'AE', // UAE'co.uk':  'UK', // UK'com':    'US', // US}/** Amazon TLDs which support the "smile.amazon" subdomain*/const SMILE = new Set(['com', 'co.uk', 'de'])/** a tiny DOM builder to avoid cluttering the code with HTML templates* https://github.com/aduth/hijinks*/const el = hijinks/*********************** Functions and Classes ********************************//** A class which encapsulates the logic for creating and updating cross-site links*/class Linker {/** get the unique identifier (ASIN - Amazon Standard Identification Number)* for this product, or return a falsey value if it's not found*/static getASIN () {let asin, $asin = $('input#ASIN, input[name="ASIN"], input[name="ASIN.0"]')if ($asin.length) {asin = $asin.val()} else { // if there's a canonical link, try to retrieve the ASIN from its URI// <link rel="canonical" href="https://www.amazon.com/Follows-Movie-Poster-18-28/dp/B01BKUBARA" />let match, canonical = $('link[rel="canonical"][href]').attr('href')if (canonical && (match = canonical.match('/dp/(\\w+)$'))) {asin = match[1]}}return asin}constructor (asin) {// the unique Amazon identifier for this productthis.asin = asin// the navbar to add the cross-site links tothis.crossSiteLinks = $('#nav-xshop')// an array of our added elements - jQuery objects representing// <a>...</a> links//// we keep a reference to these elements so we can easily remove them// from the DOM (and replace them with new elements) whenever the// country selection changesthis.links = []// extract and store 1) the subdomain (e.g. "www.amazon") and 2) the TLD// (e.g. "co.uk") of the current siteconst parts = location.hostname.split('.')// 1) the subdomain (part before the TLD) of the current site e.g.// "www.amazon" or "smile.amazon"this.subdomain = parts.slice(0, 2).join('.')// 2) the TLD of the current site e.g. "co.uk" or "com"this.tld = parts.slice(2).join('.')}/** add a link element to the internal `links` array*/addLink (tld, country) {const attrs = {class: 'nav-a',style: 'display: inline-block',title: `amazon.${tld}`}// XXX we can't always preserve the "smile.amazon" subdomain as it's not// available for most Amazon TLDsconst subdomain = SMILE.has(tld) ? this.subdomain : 'www.amazon'let tagif (tld === this.tld) {tag = 'strong'} else {tag = 'a'attrs.href = `//${subdomain}.${tld}/dp/${this.asin}`}const link = el(tag, attrs, country)this.links.push($(link))}/** populate the array of links and display them by prepending them to the* body of the cross-site navigation bar*/addLinks () {// create the subset of the TLD -> country-code map (SITES)// corresponding to the enabled sitesconst sites = Object.entries(SITES).filter(([tld]) => GM_config.get(tld)).reduce((obj, [key, val]) => { return obj[key] = val, obj }, {})if (!$.isEmptyObject(sites)) {// sort the sites by the country code (e.g. AU) rather than the TLD// (e.g. com.au)// const tlds = sortBy(Object.keys(sites), tld => sites[tld])const tlds = Object.keys(sites).sort((a, b) => sites[a].localeCompare(sites[b]))// populate the `links` array with jQuery wrappers for link elements// (i.e. <a>...</a>)for (const tld of tlds) {this.addLink(tld, sites[tld])}// prepend the cross-site links to the body of the crossSiteLinks// containerthis.crossSiteLinks.prepend.apply(this.crossSiteLinks, this.links)}}/** build the underlying data model used by the GM_config utility*/initializeConfig () {const checkboxes = {}// sort by country codefor (const tld of Object.keys(SITES).sort((a, b) => SITES[a].localeCompare(SITES[b]))) {const country = SITES[tld]checkboxes[tld] = {type: 'checkbox',label: country,title: `amazon.${tld}`,default: (country === 'UK' || country === 'US')}}// re-render the links when the settings are updatedconst save = () => {this.removeLinks()this.addLinks()GM_config.close()}const callbacks = { save }GM_config.init('Amazon International Links Settings', checkboxes, callbacks)}/** remove all added links from the DOM and clear the array referencing them*/removeLinks () {const { links } = thisfor (const $link of links) {$link.remove() // remove from the DOM...}links.length = 0 // ...and empty the array}}/*********************** Main ********************************/const run = () => {const asin = Linker.getASIN()if (asin) {const showConfig = () => GM_config.open() // display the settings managerconst linker = new Linker(asin)linker.initializeConfig()linker.addLinks()GM_registerMenuCommand('Configure Amazon International Links', showConfig)}}run()