content-script.js

function Func() {
	return new Promise((resolve, reject) => {
		var jsString = document.querySelector("#player >script:nth-child(2)")
		if (!jsString) {
			jsString = document.querySelector("#player >script:nth-child(1)")
		}
		if (jsString) {
			jsString = jsString.innerHTML
			jsString = `	var playerObjList = {};\n${jsString}`
			var flashvars = jsString.match("flashvars_[0-9]{1,}")[0]
			eval(jsString)
			var jsObject = eval(flashvars)
			resolve(jsObject)
		}
		jsString = document.querySelector("#video-player-bg > script:nth-child(6)")
		if (jsString) {
			jsString = jsString.innerHTML
			console.log(jsString)
			var videoType = []
			var urlTitle = jsString.match(/setVideoTitle\('(.*?)'\);/)[1]
			var urlLow = jsString.match(/setVideoUrlLow\('(.*?)'\);/)[1]
			if (urlLow){
				var obj ={
					key: "Low",
					val: urlLow,
					video_title: urlTitle
				}
				videoType.push(obj)
			}
			var urlHigh = jsString.match(/setVideoUrlHigh\('(.*?)'\);/)[1]
			if (urlHigh){
				var obj ={
					key: "High",
					val: urlHigh,
					video_title: urlTitle
				}
				videoType.push(obj)
			}
			chrome.runtime.onMessage.addListener(function (request, sender, sendResponse) {
			if (request.cmd == 'test') 
				sendResponse(videoType);
			});
		}
	})
}

function getMp4Url(url){
    return new Promise((resolve, reject) => {
        var xhr = new XMLHttpRequest();
        xhr.open("GET", url , true);
        xhr.onload = function(){
            if (xhr.readyState === 4 && xhr.status === 200){
                mp4UrlJson = JSON.parse(xhr.responseText);
                resolve(mp4UrlJson);
            } else {
                reject(xhr.statusText);
            }
        };
        xhr.send();
    });
}

Func().then(res => {
	var videoType = []
	Object.keys(res['mediaDefinitions']).forEach((item) => {
		var itemInfo = res['mediaDefinitions'][item]
		if (itemInfo['format'] == 'mp4') {
			getMp4Url(itemInfo['videoUrl']).then(mp4UrlJson => {
				for (const mp4Url of mp4UrlJson){
					var obj = {
					key: mp4Url['quality'],
					val: mp4Url['videoUrl'],
					video_title:res.video_title
					}
				videoType.push(obj)
				}
			})
		}
	})
	chrome.runtime.onMessage.addListener(function (request, sender, sendResponse) {
		if (request.cmd == 'test') 
			sendResponse(videoType);
	});
});