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import { createRequire } from 'node:module';
import fetch from 'node-fetch';
import express from 'express';
import { translate as bingTranslate } from 'bing-translate-api';
import iconv from 'iconv-lite';
import urlJoin from 'url-join';
import { readSecret, SECRET_KEYS } from './secrets.js';
import { getConfigValue, uuidv4 } from '../util.js';
const DEEPLX_URL_DEFAULT = 'http://127.0.0.1:1188/translate';
const ONERING_URL_DEFAULT = 'http://127.0.0.1:4990/translate';
const LINGVA_DEFAULT = 'https://lingva.ml/api/v1';
export const router = express.Router();
/**
* Get the Google Translate API client.
* @returns {import('google-translate-api-browser')} Google Translate API client
*/
function getGoogleTranslateClient() {
const require = createRequire(import.meta.url);
const googleTranslateApi = require('google-translate-api-browser');
return googleTranslateApi;
}
/**
* Tries to decode an ArrayBuffer to a string using iconv-lite for UTF-8.
* @param {ArrayBuffer} buffer ArrayBuffer
* @returns {string} Decoded string
*/
function decodeBuffer(buffer) {
try {
return iconv.decode(Buffer.from(buffer), 'utf-8');
} catch (error) {
console.error('Failed to decode buffer:', error);
return Buffer.from(buffer).toString('utf-8');
}
}
router.post('/libre', async (request, response) => {
try {
const key = readSecret(request.user.directories, SECRET_KEYS.LIBRE);
const url = readSecret(request.user.directories, SECRET_KEYS.LIBRE_URL);
if (!url) {
console.warn('LibreTranslate URL is not configured.');
return response.sendStatus(400);
}
if (request.body.lang === 'zh-CN') {
request.body.lang = 'zh';
}
if (request.body.lang === 'zh-TW') {
request.body.lang = 'zt';
}
if (request.body.lang === 'pt-BR' || request.body.lang === 'pt-PT') {
request.body.lang = 'pt';
}
const text = request.body.text;
const lang = request.body.lang;
if (!text || !lang) {
return response.sendStatus(400);
}
console.debug('Input text: ' + text);
const result = await fetch(url, {
method: 'POST',
body: JSON.stringify({
q: text,
source: 'auto',
target: lang,
format: 'text',
api_key: key,
}),
headers: { 'Content-Type': 'application/json' },
});
if (!result.ok) {
const error = await result.text();
console.warn('LibreTranslate error: ', result.statusText, error);
return response.sendStatus(500);
}
/** @type {any} */
const json = await result.json();
console.debug('Translated text: ' + json.translatedText);
return response.send(json.translatedText);
} catch (error) {
console.error('Translation error: ' + error.message);
return response.sendStatus(500);
}
});
router.post('/google', async (request, response) => {
try {
const text = request.body.text;
const lang = request.body.lang;
if (!text || !lang) {
return response.sendStatus(400);
}
console.debug('Input text: ' + text);
const { generateRequestUrl, normaliseResponse } = getGoogleTranslateClient();
const requestUrl = generateRequestUrl(text, { to: lang });
const result = await fetch(requestUrl);
if (!result.ok) {
console.warn('Google Translate error: ', result.statusText);
return response.sendStatus(500);
}
const buffer = await result.arrayBuffer();
const translateResponse = normaliseResponse(JSON.parse(decodeBuffer(buffer)));
const translatedText = translateResponse.text;
response.setHeader('Content-Type', 'text/plain; charset=utf-8');
console.debug('Translated text: ' + translatedText);
return response.send(translatedText);
} catch (error) {
console.error('Translation error', error);
return response.sendStatus(500);
}
});
router.post('/yandex', async (request, response) => {
try {
if (request.body.lang === 'pt-PT') {
request.body.lang = 'pt';
}
if (request.body.lang === 'zh-CN' || request.body.lang === 'zh-TW') {
request.body.lang = 'zh';
}
const chunks = request.body.chunks;
const lang = request.body.lang;
if (!chunks || !lang) {
return response.sendStatus(400);
}
// reconstruct original text to log
let inputText = '';
const params = new URLSearchParams();
for (const chunk of chunks) {
params.append('text', chunk);
inputText += chunk;
}
params.append('lang', lang);
const ucid = uuidv4().replaceAll('-', '');
console.debug('Input text: ' + inputText);
const result = await fetch(`https://translate.yandex.net/api/v1/tr.json/translate?ucid=${ucid}&srv=android&format=text`, {
method: 'POST',
body: params,
headers: {
'Content-Type': 'application/x-www-form-urlencoded',
},
});
if (!result.ok) {
const error = await result.text();
console.warn('Yandex error: ', result.statusText, error);
return response.sendStatus(500);
}
/** @type {any} */
const json = await result.json();
const translated = json.text.join();
console.debug('Translated text: ' + translated);
return response.send(translated);
} catch (error) {
console.error('Translation error: ' + error.message);
return response.sendStatus(500);
}
});
router.post('/lingva', async (request, response) => {
try {
const secretUrl = readSecret(request.user.directories, SECRET_KEYS.LINGVA_URL);
const baseUrl = secretUrl || LINGVA_DEFAULT;
if (!secretUrl && baseUrl === LINGVA_DEFAULT) {
console.warn('Lingva URL is using default value.', LINGVA_DEFAULT);
}
if (request.body.lang === 'zh-CN' || request.body.lang === 'zh-TW') {
request.body.lang = 'zh';
}
if (request.body.lang === 'pt-BR' || request.body.lang === 'pt-PT') {
request.body.lang = 'pt';
}
const text = request.body.text;
const lang = request.body.lang;
if (!text || !lang) {
return response.sendStatus(400);
}
console.debug('Input text: ' + text);
const url = urlJoin(baseUrl, 'auto', lang, encodeURIComponent(text));
const result = await fetch(url);
if (!result.ok) {
const error = await result.text();
console.warn('Lingva error: ', result.statusText, error);
}
/** @type {any} */
const data = await result.json();
console.debug('Translated text: ' + data.translation);
return response.send(data.translation);
} catch (error) {
console.error('Translation error', error);
return response.sendStatus(500);
}
});
router.post('/deepl', async (request, response) => {
try {
const key = readSecret(request.user.directories, SECRET_KEYS.DEEPL);
if (!key) {
console.warn('DeepL key is not configured.');
return response.sendStatus(400);
}
if (request.body.lang === 'zh-CN' || request.body.lang === 'zh-TW') {
request.body.lang = 'ZH';
}
const text = request.body.text;
const lang = request.body.lang;
const formality = getConfigValue('deepl.formality', 'default');
if (!text || !lang) {
return response.sendStatus(400);
}
console.debug('Input text: ' + text);
const params = new URLSearchParams();
params.append('text', text);
params.append('target_lang', lang);
if (['de', 'fr', 'it', 'es', 'nl', 'ja', 'ru', 'pt-BR', 'pt-PT'].includes(lang)) {
params.append('formality', formality);
}
const endpoint = request.body.endpoint === 'pro'
? 'https://api.deepl.com/v2/translate'
: 'https://api-free.deepl.com/v2/translate';
const result = await fetch(endpoint, {
method: 'POST',
body: params,
headers: {
'Accept': 'application/json',
'Authorization': `DeepL-Auth-Key ${key}`,
'Content-Type': 'application/x-www-form-urlencoded',
},
});
if (!result.ok) {
const error = await result.text();
console.warn('DeepL error: ', result.statusText, error);
return response.sendStatus(500);
}
/** @type {any} */
const json = await result.json();
console.debug('Translated text: ' + json.translations[0].text);
return response.send(json.translations[0].text);
} catch (error) {
console.error('Translation error: ' + error.message);
return response.sendStatus(500);
}
});
router.post('/onering', async (request, response) => {
try {
const secretUrl = readSecret(request.user.directories, SECRET_KEYS.ONERING_URL);
const url = secretUrl || ONERING_URL_DEFAULT;
if (!url) {
console.warn('OneRing URL is not configured.');
return response.sendStatus(400);
}
if (!secretUrl && url === ONERING_URL_DEFAULT) {
console.info('OneRing URL is using default value.', ONERING_URL_DEFAULT);
}
if (request.body.lang === 'pt-BR' || request.body.lang === 'pt-PT') {
request.body.lang = 'pt';
}
const text = request.body.text;
const from_lang = request.body.from_lang;
const to_lang = request.body.to_lang;
if (!text || !from_lang || !to_lang) {
return response.sendStatus(400);
}
const params = new URLSearchParams();
params.append('text', text);
params.append('from_lang', from_lang);
params.append('to_lang', to_lang);
console.debug('Input text: ' + text);
const fetchUrl = new URL(url);
fetchUrl.search = params.toString();
const result = await fetch(fetchUrl, {
method: 'GET',
});
if (!result.ok) {
const error = await result.text();
console.warn('OneRing error: ', result.statusText, error);
return response.sendStatus(500);
}
/** @type {any} */
const data = await result.json();
console.debug('Translated text: ' + data.result);
return response.send(data.result);
} catch (error) {
console.error('Translation error: ' + error.message);
return response.sendStatus(500);
}
});
router.post('/deeplx', async (request, response) => {
try {
const secretUrl = readSecret(request.user.directories, SECRET_KEYS.DEEPLX_URL);
const url = secretUrl || DEEPLX_URL_DEFAULT;
if (!url) {
console.warn('DeepLX URL is not configured.');
return response.sendStatus(400);
}
if (!secretUrl && url === DEEPLX_URL_DEFAULT) {
console.info('DeepLX URL is using default value.', DEEPLX_URL_DEFAULT);
}
const text = request.body.text;
let lang = request.body.lang;
if (request.body.lang === 'zh-CN' || request.body.lang === 'zh-TW') {
lang = 'ZH';
}
if (!text || !lang) {
return response.sendStatus(400);
}
console.debug('Input text: ' + text);
const result = await fetch(url, {
method: 'POST',
body: JSON.stringify({
text: text,
source_lang: 'auto',
target_lang: lang,
}),
headers: {
'Accept': 'application/json',
'Content-Type': 'application/json',
},
});
if (!result.ok) {
const error = await result.text();
console.warn('DeepLX error: ', result.statusText, error);
return response.sendStatus(500);
}
/** @type {any} */
const json = await result.json();
console.debug('Translated text: ' + json.data);
return response.send(json.data);
} catch (error) {
console.error('DeepLX translation error: ' + error.message);
return response.sendStatus(500);
}
});
router.post('/bing', async (request, response) => {
try {
const text = request.body.text;
let lang = request.body.lang;
if (request.body.lang === 'zh-CN') {
lang = 'zh-Hans';
}
if (request.body.lang === 'zh-TW') {
lang = 'zh-Hant';
}
if (request.body.lang === 'pt-BR') {
lang = 'pt';
}
if (!text || !lang) {
return response.sendStatus(400);
}
console.debug('Input text: ' + text);
const result = await bingTranslate(text, null, lang);
const translatedText = result?.translation;
console.debug('Translated text: ' + translatedText);
return response.send(translatedText);
} catch (error) {
console.error('Translation error', error);
return response.sendStatus(500);
}
});
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