ChatGPT Translator

The ChatGPT Translator is a userscript that automatically translates messages in the chat and user's messages before submitting them in English.
当前为 2023-01-20 提交的版本，查看最新版本。
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// ==UserScript==
// @name         ChatGPT Translator
// @description  The ChatGPT Translator is a userscript that automatically translates messages in the chat and user's messages before submitting them in English.
// @namespace    ChatGPTTranslator
// @version      1.8.1
// @author       CriDos
// @match        https://chat.openai.com/*
// @icon         https://www.google.com/s2/favicons?sz=64&domain=chat.openai.com
// @require      https://cdnjs.cloudflare.com/ajax/libs/jquery/3.6.3/jquery.min.js
// @grant        GM_xmlhttpRequest
// @run-at       document-end
// @license      MIT
// ==/UserScript==
 
'use strict';
 
console.log(`ChatGPT Translator initializing...`);
 
let debug = false;
 
setInterval(() => {
    try {
        addAutoTranslate();
    } catch (error) {
        console.error(error);
    }
 
    try {
        findAndHookTextareaElement();
    } catch (error) {
        console.error(error);
    }
}, 100);
 
function addAutoTranslate() {
    var messages = document.querySelectorAll(".markdown.prose");
 
    for (var i = 0; i < messages.length; i++) {
        const msgMarkdownNode = messages[i];
        const parentMsgMarkdown = msgMarkdownNode.parentElement;
 
        if (parentMsgMarkdown.isAutoTranslate) {
            continue;
        }
        parentMsgMarkdown.isAutoTranslate = true;
 
        setInterval(async () => {
            await translateNode(msgMarkdownNode);
        }, 500);
    }
}
 
function findAndHookTextareaElement() {
    const targetElement = document.querySelector("textarea");
    if (targetElement === null) {
        return;
    }
 
    if (targetElement.isAddHookKeydownEvent === true) {
        return;
    }
 
    targetElement.isAddHookKeydownEvent = true;
 
    console.log(`Textarea element found. Adding keydown event listener.`);
    targetElement.addEventListener("keydown", async event => await handleSubmit(event, targetElement), true);
}
 
async function handleSubmit(event, targetElement) {
    console.log(`Keydown event detected: type - ${event.type}, key - ${event.key}`);
 
    if (event.shiftKey && event.key === "Enter") {
        return;
    }
 
    if (window.isActiveOnSubmit === true) {
        return;
    }
 
    if (event.key === "Enter") {
        window.isActiveOnSubmit = true;
        event.stopImmediatePropagation();
 
        const request = targetElement.value;
        targetElement.value = "";
 
        const translatedText = await translate(request, navigator.language, "en", "text");
 
        targetElement.focus();
        targetElement.value = translatedText;
        const enterEvent = new KeyboardEvent("keydown", {
            bubbles: true,
            cancelable: true,
            key: "Enter",
            code: "Enter"
        });
        targetElement.dispatchEvent(enterEvent);
 
        window.isActiveOnSubmit = false;
    }
}
 
async function translateNode(node) {
    const translateClassName = "translate-markdown";
    const parentNode = node.parentElement;
    const nodeContent = $(node).html();
 
    if (node.storeContent == nodeContent) {
        return;
    }
    node.storeContent = nodeContent;
 
    var translateNode = parentNode.querySelector(`.${translateClassName}`);
    if (translateNode == null) {
        translateNode = node.cloneNode(true);
        translateNode.classList.add(translateClassName);
        parentNode.insertBefore(translateNode, parentNode.firstChild);
    }
 
    var translatedContent = await translateHTML(nodeContent, "auto", navigator.language)
    translatedContent = translatedContent.replace(/<\/div>$/, '');
 
    const endOfTranslationText = await translate("end of translation", "en", navigator.language, "text");
 
    $(translateNode).html(translatedContent + `<p>.......... ${endOfTranslationText} ..........</p></div>`);
}
 
async function translateHTML(html, sLang, tLang) {
    const excludeTagRegex = /<(pre|code)[^>]*>([\s\S]*?)<\/(pre|code)>/g;
    const excludeTags = [];
    const excludePlaceholder = 'e0x1c';
 
    let htmlContent = html;
 
    let excludeTagsMatch;
    while (excludeTagsMatch = excludeTagRegex.exec(html)) {
        excludeTags.push(excludeTagsMatch[0]);
        htmlContent = htmlContent.replace(excludeTagsMatch[0], `<${excludePlaceholder}${excludeTags.length - 1}>`);
    }
 
    if (debug) {
        console.log(`preTranslateHTML: ${html}`);
    }
 
    htmlContent = await translate(htmlContent, sLang, tLang);
 
    for (let i = 0; i < excludeTags.length; i++) {
        htmlContent = htmlContent.replace(`<${excludePlaceholder}${i}>`, excludeTags[i]);
    }
 
    if (debug) {
        console.log(`postTranslateHTML: ${htmlContent}`);
    }
 
    return htmlContent;
}
 
const cache = {};
 
async function translate(text, sLang, tLang, format, key) {
    try {
        if (debug) {
            console.log(`preTranslate: ${text}`);
        }
 
        if (format == null) {
            format = "html";
        }
 
        if (key == null) {
            key = "AIzaSyBOti4mM-6x9WDnZIjIeyEU21OpBXqWBgw";
        }
 
        const cacheKey = text + '_' + format;
 
        if (cache[cacheKey]) {
            return cache[cacheKey];
        }
 
        const response = await new Promise((resolve, reject) => {
            GM_xmlhttpRequest({
                method: "POST",
                url: `https://translate.googleapis.com/translate_a/t?client=gtx&format=${format}&sl=${sLang}&tl=${tLang}&key=${key}`,
                data: `q=${encodeURIComponent(text)}`,
                headers: {
                    "Content-Type": "application/x-www-form-urlencoded"
                },
                onload: response => {
                    const json = JSON.parse(response.responseText);
                    if (Array.isArray(json[0])) {
                        resolve(json[0][0]);
                    } else {
                        resolve(json[0]);
                    }
                },
                onerror: response => {
                    reject(response.statusText);
                }
            });
        });
 
        cache[cacheKey] = response;
 
        if (debug) {
            console.log(`postTranslate: ${response}`);
        }
 
        return response;
    } catch (error) {
        console.error(error);
    }
}