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BZHDeveloper / Disable YouTube translation

// ==UserScript==
// @name        Disable YouTube translation
// @description Disabled this *** feature, keep original text.
// @author      BZHDeveloper
// @license     MIT
// @version     1.0.3
// @match       *://*.youtube.com/*
// @downloadURL https://openuserjs.org/src/scripts/BZHDeveloper/Disable_YouTube_translation.user.js
// @updateURL   https://openuserjs.org/src/scripts/BZHDeveloper/Disable_YouTube_translation.user.js
// @grant       none
// ==/UserScript==

var infos = {
	run : false,
	title : null,
	title_ok : false,
	description : null,
	description_ok : false
};

function Uri (data) {
	var link = document.createElement ("a");
	link.href = data;
	
	this.scheme = link.protocol;
	this.host = link.hostname;
	this.port = 0;
	if (link.port.length > 0)
		this.port = parseInt(link.port);
	if (this.scheme == "http:"  && this.port == 0)
		this.port = 80;
	if (this.scheme == "https:"  && this.port == 0)
		this.port = 443;
	this.username = link.username;
	this.password = link.password;
	this.path = link.pathname;
	this.parameters = {};
	if (link.search !== null && link.search.length > 0) {
		var q = link.search.substring(1);
		var p = q.split('&');
		for (var i = 0; i < p.length; i++) {
			var k = p[i].split('=')[0];
			if (p[i].indexOf('=') > 0)
				this.parameters[k] = p[i].split('=')[1];
			else
				this.parameters[k] = null;
		}
	}
	if (link.hash !== null)
		this.fragment = link.hash.substring(1);
	
	this.toString = function (b) {
		var result = this.scheme + "//";
		if (this.username != null && this.username.length > 0) {
			result += this.username;
			if (this.password != null && this.password.length > 0)
				result += (":" + this.password);
			result += "@";
		}
		result += this.host;
		if (!(this.scheme == "http:" && this.port == 80 || this.scheme == "https:" && this.port == 443))
			result += (":" + this.port);
		if (this.path != "/")
			result += this.path;
		if (b == false)
			return result;
		var search = [];
		for (var key in this.parameters) {
			search.push (key + "=" + this.parameters[key]);
		}
		if (search.length > 0)
			result += ("?" + search.join ("&"));
		if (this.fragment != null && this.fragment.toString().length > 0)
			result += ("#" + this.fragment);
		return result;
	}
}

var uri = new Uri (document.location.href);
if (!uri.parameters.hasOwnProperty ("v"))
	return;

var obs = new MutationObserver (function (mutations, observer) {
	if (infos.run == true)
		return;
	if (infos.title != null) {
		var title_element = null, desc_element = null;
		// *** polymer
		if (document.querySelector ("#container > h1 > yt-formatted-string") != null) {
			title_element = document.querySelector ("#container > h1 > yt-formatted-string");
			desc_element = document.querySelector ("#description > yt-formatted-string");
		}
		else {
			title_element = document.querySelector ("#eow-title");
			desc_element = document.querySelector ("#eow-description");
		}
		if (title_element != null && infos.title_ok == false) {
			title_element.textContent = infos.title;
			infos.title_ok = true;
		}
		if (desc_element != null && infos.description_ok == false) {
			desc_element.innerHTML = infos.description;
			infos.description_ok = true;
		}
		return;
	}
	infos.run = true;
	fetch ("https://www.youtube.com/watch?v=" + uri.parameters.v).then (response => {
		return response.text();
	}).then (text => {
		var json = text.split ("window[\"ytInitialPlayerResponse\"] = (")[1].split (");")[0].trim();
		var object = JSON.parse (json);
		infos.title = object.videoDetails.title;
		var desc = object.videoDetails.shortDescription;
		desc = desc.replace(/\n/g, "<br />");
		[ " ", "<br />" ].forEach (str => {
			var array = desc.split (str);
			for (var i = 0; i < array.length; i++) {
				if (array[i].indexOf ("http://") == 0 || array[i].indexOf ("https://") == 0 || array[i].indexOf ("ftp://") == 0 || array[i].indexOf ("magnet:") == 0)
					array[i] = "<a href=\"" + array[i] + "\">" + array[i] + "</a>";
			}
			desc = array.join (str);
		});
		infos.description = desc;
		console.log (infos.description);
		infos.run = false;
	});
});

obs.observe (document, {attributes: false, childList: true, characterData: false, subtree: true});