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index.js
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index.js
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/*
author: Naveen Kumarasinghe <[email protected]>
license: MIT
*/
const puppeteer = require('puppeteer-core');
const fs = require('fs');
const fetch = require("node-fetch");
const config = require('./config');
var path = require("path");
const DOWNLOAD_DIR = path.join(__dirname, 'downloads')
let courseLinks, browser, page;
// main
(async () => {
// read course list
if (!(courseLinks = fs.readFileSync('./courselinks.txt', { encoding: 'utf8' }))) {
console.error('Could not read courselinks.txt')
return
}
// check chrome
if (!fs.existsSync(config.chromeExecutablePath)) {
console.error('You need to specify a valid "chromeExecutablePath" in config.js')
return
}
// start chrome
browser = await puppeteer.launch({
"headless": false,
"defaultViewport": null,
"executablePath": config.chromeExecutablePath,
"userDataDir": './chrome-session',
args: [
'--disable-web-security'
]
})
courseLinks = courseLinks.split('\n')
console.log(`Detected ${courseLinks.length} courses.`)
// create download dir
fs.existsSync(DOWNLOAD_DIR) || fs.mkdirSync(DOWNLOAD_DIR)
console.log(`Download directory:${DOWNLOAD_DIR}`)
// get first tab
page = (await browser.pages())[0]
// attach download button
page.on('domcontentloaded', () => {
page.evaluate(() => {
return new Promise((resolve) => {
let btn = document.createElement('button')
btn.innerHTML = 'DOWNLOAD'
btn.style = 'position:absolute; top:0; right:0; z-index:100000; width:200px; height:80px;'
btn.onclick = resolve
document.body.prepend(btn)
})
})
.then(() => {
page.removeAllListeners('domcontentloaded')
downloadCourses()
})
.catch((err) => { })
})
// go to start page
await page.goto(config.startPage, { waitUntil: "networkidle2", timeout: 0 })
await page.evaluate(() => {
alert('Sign in first, and click the Download button top right side.')
})
})()
async function downloadCourses() {
for (let i = 0; i < courseLinks.length; ++i) {
let courseURL = courseLinks[i]
if (courseURL.startsWith('#')) { continue }
console.log(`Parsing course ${i + 1} of ${courseLinks.length}: ${courseURL}`)
await page.goto(courseURL, { waitUntil: "networkidle2", timeout: 0 })
await page._client.send('Page.setDownloadBehavior', { behavior: 'allow', downloadPath: DOWNLOAD_DIR }) // set download dir
// calculate resume position
let downloadedFileCount = fs.readdirSync(DOWNLOAD_DIR).filter(fn => fn.endsWith('.mp4')).length
if (downloadedFileCount) {
console.log(`Resuming download from lesson ${downloadedFileCount}...`)
--downloadedFileCount
}
let downloadStats = await downloadCurrentCourse(downloadedFileCount)
if (downloadStats.isComplete) {
console.log('Course downloaded successfully!\nMoving files...')
// move files
let COURSE_DIR = path.join(DOWNLOAD_DIR, downloadStats.courseTitle)
fs.existsSync(COURSE_DIR) || fs.mkdirSync(COURSE_DIR)
let downloadFileList = fs.readdirSync(DOWNLOAD_DIR).filter(fn => fn.endsWith('.mp4'))
downloadFileList.forEach((filename) => {
moveIntoDir(path.join(DOWNLOAD_DIR, filename), COURSE_DIR)
})
// update couse link file
courseLinks[i] = '#' + courseLinks[i] // mark course as downloaded
fs.writeFileSync('./courselinks.txt', courseLinks.join('\n'))
}
else {
console.error('Course downloading unsuccessful! Retrying...')
--i
}
}
console.log('Program ended.')
}
async function downloadCurrentCourse(startLesson) {
return new Promise(async (resolve) => {
// start parsing
let courseTitle = await page.evaluate((startLesson, VIDEO_LOAD_WAIT) => {
let ticker = document.createElement('div')
ticker.innerText = 'Downloading course list...'
ticker.style = 'position:absolute; z-index:10000; background-color:orange; color:white; padding: 10px;'
document.body.prepend(ticker)
if (startLesson) (ticker.innerText = `Resuming download from lesson ${startLesson + 1}...`)
let courseTitle = 'LinkedIn - ' + document.querySelector('h1').innerText.trim().replace(/[^a-zA-Z ]/g, "")
return new Promise(async (resolve) => {
let SELECTOR_CHAPTER_EXPANDERS = '.classroom-toc-chapter__toggle'
let SELECTOR_LESSONS = '[data-control-name="toc_item"]'
// expand chapters on sidebar except the first
let chapterNodes = document.querySelectorAll(SELECTOR_CHAPTER_EXPANDERS)
for (let i = 1; i < chapterNodes.length; ++i) { chapterNodes[i].click() }
// get lesson nodes
let lessonNodes = document.querySelectorAll(SELECTOR_LESSONS)
// click each lesson node and grab the video source
for (let i = startLesson; i < lessonNodes.length; ++i) {
ticker.innerText = `Parsing lesson ${(i + 1)}/${lessonNodes.length}...`
let lessonNode = lessonNodes[i]
if (lessonNode.innerText.toLowerCase().includes('quiz')) { continue } // skip quizes
lessonNode.click() // play lesson
// wait and get video URL
let videoURL = await new Promise(resolve => {
let interval = setInterval(() => {
let player = document.querySelector('video')
if (player && player.src && !player.src.includes('0123456789')) {
clearInterval(interval)
resolve(player.src)
player.src = '0123456789' // mark dirty
}
// player crashed
let buttons = document.querySelectorAll('button')
buttons.forEach((button) => {
if (button.innerText.includes('Try again')) {
ticker.innerText = `Player crashed! Restarting download...`
resolve()
}
})
}, VIDEO_LOAD_WAIT)
})
// player crashed
if (!videoURL) {
resolve()
return
}
// download file through browser
let filename = (i + 1) + '. ' + lessonNode.innerText.split('\n')[0].replace(/[^a-zA-Z ]/g, "") + '.mp4'
ticker.innerText = `Downloading lesson (${i + 1}/${lessonNodes.length})...\n${filename}`
let res = await fetch(videoURL, { credentials: 'include' })
let blob = await res.blob()
let a = document.createElement("a")
a.href = URL.createObjectURL(blob)
a.download = filename
a.click()
}
await new Promise(resolve => setTimeout(resolve, 3000))
ticker.innerText = `Preparing to download the next course...`
resolve(courseTitle)
})
}, startLesson, config.videoLoadWait)
// download success
if (courseTitle) {
resolve({ isComplete: true, courseTitle: courseTitle })
}
// download fail
else {
resolve({ isComplete: false, courseTitle: courseTitle })
}
})
}
function moveIntoDir(filename, dir) {
let baseName = path.basename(filename)
fs.renameSync(filename, `${dir}/${baseName}`)
}