Enhances YouTube with dual language subtitles.
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// ==UserScript==
// @name YtDLS: YouTube Dual Language Subtitle (Modified)
// @name:zh-CN YtDLS: Youtube 双语字幕（改）
// @name:zh-TW YtDLS: Youtube 雙語字幕（改）
// @version 2.0.6
// @description Enhances YouTube with dual language subtitles.
// @description:zh-CN 为YouTube添加双语字幕增强功能。
// @description:zh-TW 增強YouTube的雙語字幕功能。
// @author CY Fung
// @author Coink Wang
// @match https://www.youtube.com/*
// @match https://m.youtube.com/*
// @exclude /^https?://\S+\.(txt|png|jpg|jpeg|gif|xml|svg|manifest|log|ini|webp|webm)[^\/]*$/
// @require https://cdn.jsdelivr.net/gh/cyfung1031/ajax-hook@813bba9059da84e18219d8b9a4f8fe9c7f59a77f/dist/ajaxhook.min.js
// @grant none
// @unwrap
// @allFrames true
// @inject-into page
// @run-at document-start
// @namespace Y2BDoubleSubs
// @license MIT
// @supportURL https://github.com/cyfung1031/Y2BDoubleSubs/tree/translation-api
// ==/UserScript==
/* global ah */
/*
original script: https://greatest.deepsurf.us/scripts/397363
based on v1.8.0 + PR#18 ( https://github.com/CoinkWang/Y2BDoubleSubs/pull/18 ) [v2.0.0]
added m.youtube.com support based on two scripts (https://greatest.deepsurf.us/scripts/457476 & https://greatest.deepsurf.us/scripts/464879 ) which are fork from v1.8.0
*/
(function () {
let localeLangFn = () => document.documentElement.lang || navigator.language || 'en' // follow the language used in YouTube Page
// localeLangFn = () => 'zh' // uncomment this line to define the language you wish here
function isValidForHook() {
try {
if (location.pathname === '/live_chat' || location.pathname === '/live_chat_replay') return false;
return true;
} catch (e) {
return false;
}
}
if (!isValidForHook()) return;
const Promise = (async () => { })().constructor
const _ah = ah
const fetch = window.fetch.bind(window)
const pReady = Promise.resolve()
pReady.then(() => {
let enableFullWidthSpaceSeparation = true
function encodeFullwidthSpace(text) {
if (!enableFullWidthSpaceSeparation) return text
return text.replace(/\n/g, '\n1\n').replace(/\u3000/g, '\n2\n')
}
function decodeFullwidthSpace(text) {
if (!enableFullWidthSpaceSeparation) return text
return text.replace(/\n2\n/g, '\u3000').replace(/\n1\n/g, '\n')
}
let requestDeferred = Promise.resolve()
_ah.proxy({
onRequest: (config, handler) => {
handler.next(config)
},
onResponse: (response, handler) => {
function defaultAction() {
handler.resolve(response)
}
const o = {}
try {
/** @type {string} */
const originalReqUrl = response.config.url
if (!originalReqUrl.includes('/api/timedtext') || originalReqUrl.includes('&translate_h00ked')) return defaultAction()
if (typeof ytcfg !== 'object') return defaultAction() // not a valid youtube page
let defaultJson = null
if (response.response) {
const jsonResponse = JSON.parse(response.response)
if (jsonResponse.events) defaultJson = jsonResponse
}
if (defaultJson === null) return defaultAction()
const localeLang = localeLangFn()
const langIdx = originalReqUrl.indexOf('lang=')
if (langIdx > 5) {
// &key=yt8&lang=en&fmt=json3&xorb=2&xobt=3&xovt=3
// &key=yt8&lang=ja&fmt=json3&xorb=2&xobt=3&xovt=3
// &key=yt8&lang=ja&name=Romaji&fmt=json3&xorb=2&xobt=3
let ulc = originalReqUrl.charAt(langIdx - 1)
if (ulc === '?' || ulc === '&') {
let usp = new URLSearchParams(originalReqUrl.substring(langIdx))
let uspLang = usp.get('lang')
let uspName = usp.get('name')
if (uspName === 'Romaji') return defaultAction()
if (typeof uspLang === 'string' && uspLang.toLocaleLowerCase() === localeLang.toLocaleLowerCase()) return defaultAction()
}
}
const lines = []
for (const event of defaultJson.events) {
for (const seg of event.segs) {
if (seg && typeof seg.utf8 === 'string') {
lines.push(...seg.utf8.split('\n'))
}
}
}
if (lines.length === 0) return defaultAction()
let linesText = lines.join('\n')
linesText = encodeFullwidthSpace(linesText)
const q = encodeURIComponent(linesText)
o.defaultJson = defaultJson
o.lines = lines
o.requestURL = `https://translate.googleapis.com/translate_a/single?client=gtx&sl=auto&tl=${localeLang}&dj=1&dt=t&dt=rm&q=${q}`
} catch (e) {
console.warn(e)
defaultAction()
}
function fetchData() {
return new Promise(requestDeferredResolve => {
fetch(o.requestURL, {
method: "GET",
headers: {
"Accept": "application/json",
"Accept-Encoding": "gzip, deflate, br"
},
credentials: "omit",
referrerPolicy: "no-referrer",
redirect: "error",
keepalive: false,
cache: "default"
})
.then(res => {
requestDeferredResolve()
return res.json()
})
.then(result => {
let resultText = result.sentences.map((function (s) {
return "trans" in s ? s.trans : ""
})).join("")
resultText = decodeFullwidthSpace(resultText)
return resultText.split("\n")
})
.then(translatedLines => {
const { lines, defaultJson } = o
o.lines = null
o.defaultJson = null
const addTranslation = (line, idx) => {
if (line !== lines[i + idx]) return line
let translated = translatedLines[i + idx]
if (line === translated) return line
return `${line}\n${translated}`
}
let i = 0
for (const event of defaultJson.events) {
for (const seg of event.segs) {
if (seg && typeof seg.utf8 === 'string') {
let s = seg.utf8.split('\n')
let st = s.map(addTranslation)
seg.utf8 = st.join('\n')
i += s.length
}
}
}
response.response = JSON.stringify(defaultJson)
handler.resolve(response)
}).catch(e => {
console.warn(e)
defaultAction()
})
})
}
requestDeferred = requestDeferred.then(fetchData)
}
})
})
})();