sn-translator/sn_translator/sn-translator.js

// ==UserScript==
// @name         SN translator
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  Translate posts on SN
// @author       You
// @match        https://stacker.news/*
// @icon         https://www.google.com/s2/favicons?sz=64&domain=tampermonkey.net
// @grant        GM_xmlhttpRequest
// ==/UserScript==

const headers = {
  origin: "https://libretranslate.com",
  accept: "*/*",
  "accept-language": "de-DE,de;q=0.9,ru-DE;q=0.8,ru;q=0.7,en-US;q=0.6,en;q=0.5",
  "sec-ch-ua":
    '"Not?A_Brand";v="8", "Chromium";v="108", "Google Chrome";v="108"',
  "sec-ch-ua-mobile": "?0",
  "sec-ch-ua-platform": '"Linux"',
  "sec-fetch-dest": "empty",
  "sec-fetch-mode": "cors",
  "sec-fetch-site": "same-origin",
};

function translate(text, source, target) {
  const formData = new FormData();
  formData.append("q", text);
  formData.append("source", source);
  formData.append("target", target);
  return new Promise((resolve, reject) => {
    GM_xmlhttpRequest({
      method: "POST",
      url: "https://libretranslate.com/translate",
      data: formData,
      headers,
      synchronous: true,
      onload: function (res) {
        const body = JSON.parse(res.responseText);
        if (res.status !== 200) return reject(body);
        return resolve(body.translatedText);
      },
    });
  });
}

const sleep = (ms) => new Promise((r) => setTimeout(r, ms));

function addButtons() {
  console.log("sn-translator: Adding button to every comment ...");
  const commentSection = document.querySelector(".item_comments__cN57K");
  const comments = commentSection.querySelectorAll(".comment_comment__5uvl3");
  const commentNodes = commentSection.querySelectorAll(".comment_text__nHI0E");
  for (const comment of comments) {
    const topBar = comment.querySelector(".item_other__qNlji");
    const content = comment.querySelector(".comment_text__nHI0E");
    const padding = document.createElement("span");
    padding.innerText = " ";
    const btn = document.createElement("button");
    btn.innerText = "Translate";
    btn.onclick = async (e) => {
      const t = await translate(content.innerText, "auto", "en").catch(
        console.error
      );
      if (t) content.innerText = t;
    };
    topBar.appendChild(padding);
    topBar.appendChild(btn);
  }
  console.log("Done");
}

(async function () {
  await sleep(1000);
  addButtons();
})();