Create SteamPriceConverter.user.js

SteamPriceConverter/SteamPriceConverter.user.js

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+// ==UserScript==
+// @name         Steam Price Converter
+// @namespace    https://github.com/Maks1mS/userscripts
+// @version      0.1
+// @description  try to take over the world!
+// @author       Maxim Slipenko
+// @match        https://store.steampowered.com/*
+// @icon         https://www.google.com/s2/favicons?sz=64&domain=steampowered.com
+// @grant        GM_xmlhttpRequest
+// @grant        GM_registerMenuCommand
+// ==/UserScript==
+
+(function() {
+    'use strict';
+
+    const SYMBOL_TO_CODE_MAPPING = {
+        '₸': 'KZT',
+        '$': 'USD',
+        '₴': 'UAH',
+    }
+
+    let state = {
+        source_symbol: undefined
+    }
+
+    async function getRates() {
+        const arr = await new Promise((resolve, reject) => {
+            GM_xmlhttpRequest({
+                method: 'GET',
+                url: 'https://www.cbr-xml-daily.ru/daily_utf8.xml',
+                onload: function(res) {
+                    const valutes = res.responseXML.getElementsByTagName('Valute');
+                    resolve([...valutes].map((valute) => {
+                        const charCode = valute.getElementsByTagName('CharCode')[0].textContent;
+                        const value = parseFloat(valute.getElementsByTagName('Value')[0].textContent.replace(',', '.'));
+                        const nominal = parseFloat(valute.getElementsByTagName('Nominal')[0].textContent.replace(',', '.'));
+
+                        return {
+                            charCode,
+                            value: +(value / nominal).toFixed(4)
+                        }
+                    }))
+                },
+            })
+        })
+        return Object.fromEntries(
+            arr.map(obj => [obj.charCode, obj])
+        );
+    }
+
+    function getCurrentValute() {
+        const walletText = document.getElementById('header_wallet_balance').innerText;
+        const symbol = Object.keys(SYMBOL_TO_CODE_MAPPING).find(symbol => walletText.includes(symbol))
+        return SYMBOL_TO_CODE_MAPPING[symbol];
+    }
+
+    async function main() {
+        const rates = await getRates();
+        const source_valute = getCurrentValute();
+
+        if (!source_valute) {
+            return;
+        }
+
+        const convert = (n) => +(n * rates[source_valute].value).toFixed(2);
+        replace(convert);
+
+        GM_registerMenuCommand("update", () => replace(convert), "u");
+    }
+
+    function replace(convert) {
+        let r = document.evaluate('//text()[contains(., \"₸\")]',document, null, XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null);
+
+        for (let i = 0; i < r.snapshotLength; i++) {
+            let n = r.snapshotItem(i);
+            const value = parseFloat(n.textContent.replace(" ", "").replace(',', '.'))
+            n.replaceWith(`${convert(value)} ₽`);
+            console.log(n)
+        }
+    }
+
+    main();
+})();