Amazon Force Currency Selector (Interactive)

Forces the currency on Amazon and asks which currency to display, works on all Amazon domains
Zeptejte se na otázku, přidejte recenzi nebo skript nahlašte.
Wrap lines
// ==UserScript==
// @name         Amazon Force Currency Selector (Interactive)
// @namespace    https://amazon.com/
// @version      1.1
// @license      MIT
// @description  Forces the currency on Amazon and asks which currency to display, works on all Amazon domains
// @match        https://*.amazon.*/*
// @run-at       document-start
// ==/UserScript==

(function() {
    // --- 1. Ask user for desired currency at page load ---
    let FORCED_CURRENCY = localStorage.getItem("amazonForcedCurrency");
    if (!FORCED_CURRENCY) {
        FORCED_CURRENCY = prompt("Enter your desired Amazon currency code (e.g., USD, COP, BRL, EUR):", "COP");
        if (FORCED_CURRENCY) {
            FORCED_CURRENCY = FORCED_CURRENCY.toUpperCase();
            localStorage.setItem("amazonForcedCurrency", FORCED_CURRENCY);
        } else {
            // Default to COP if user cancels
            FORCED_CURRENCY = "COP";
        }
    }

    const paramName = "currency";

    // List of main Amazon domains
    const AMAZON_DOMAINS = [
        ".amazon.com",
        ".amazon.com.br",
        ".amazon.com.mx",
        ".amazon.ca",
        ".amazon.co.uk",
        ".amazon.de",
        ".amazon.fr",
        ".amazon.it",
        ".amazon.es",
        ".amazon.in",
        ".amazon.co.jp",
        ".amazon.com.au"
    ];

    // --- 2. Force currency cookies every 500ms ---
    function forceCookies() {
        AMAZON_DOMAINS.forEach(domain => {
            document.cookie = `currencyPreference=${FORCED_CURRENCY}; path=/; domain=${domain}`;
            document.cookie = `i18n-prefs=${FORCED_CURRENCY}; path=/; domain=${domain}`;
        });
    }
    setInterval(forceCookies, 500);

    // --- 3. Rewrite any URL to include ?currency=YOUR_CURRENCY ---
    function ensureURLHasCurrency(url) {
        try {
            let u = new URL(url, location.href);
            if (u.searchParams.get(paramName) !== FORCED_CURRENCY) {
                u.searchParams.set(paramName, FORCED_CURRENCY);
            }
            return u.toString();
        } catch (e) {
            return url;
        }
    }

    // Modify all links on the page
    function fixLinks() {
        document.querySelectorAll("a[href]").forEach(a => {
            if (!a.__fixedCurrency) {
                a.href = ensureURLHasCurrency(a.href);
                a.__fixedCurrency = true;
            }
        });
    }
    document.addEventListener("DOMContentLoaded", fixLinks);
    document.addEventListener("mouseover", fixLinks);
    document.addEventListener("click", fixLinks);

    // --- 4. Intercept SPA URL changes ---
    const pushState = history.pushState;
    history.pushState = function() {
        arguments[2] = ensureURLHasCurrency(arguments[2]);
        return pushState.apply(this, arguments);
    };
    window.addEventListener("popstate", () => {
        if (!location.search.includes(`${paramName}=${FORCED_CURRENCY}`)) {
            location.replace(ensureURLHasCurrency(location.href));
        }
    });

    // --- 5. Intercept fetch/XHR to block Amazon attempts to change currency ---
    function interceptURL(original) {
        return function(url, ...rest) {
            return original.call(this, ensureURLHasCurrency(url), ...rest);
        };
    }
    window.fetch = interceptURL(window.fetch);

    const open = XMLHttpRequest.prototype.open;
    XMLHttpRequest.prototype.open = function(method, url, ...rest) {
        return open.call(this, method, ensureURLHasCurrency(url), ...rest);
    };

})();