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Download course script
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| const https = require("https"); | |
| // For using in browser, remove `require` and `fetch` mockup | |
| function fetch(url) { | |
| return new Promise((resolve, reject) => { | |
| https | |
| .get(url, (res) => { | |
| res.setEncoding("utf8"); | |
| let response = ""; | |
| res.on("data", (data) => { | |
| response += data; | |
| }); | |
| res.on("end", () => | |
| resolve({ | |
| text: () => response, | |
| json: () => JSON.parse(response), | |
| }) | |
| ); | |
| }) | |
| .on("error", reject); | |
| }); | |
| } | |
| class TokenFetch { | |
| // Class constants | |
| HTML_PARSE_REGEX = /\/s\/([a-z0-9]+)\/(.*)\/(.*)\.mp4/; | |
| FREE_COURSE_URL = "https://coursehunter.net/course/rubyonrails"; | |
| constructor(cronTimer = 3000) { | |
| this.token = null; | |
| this.taskTimer = null; | |
| this.CRON_TIMER = cronTimer; | |
| return this; | |
| } | |
| // Fetch request and expect response as HTML Response | |
| fetch = async () => { | |
| return fetch(this.FREE_COURSE_URL).then((res) => res.text()); | |
| }; | |
| // Parse `token` from HTML | |
| parse = (html) => { | |
| const [_, token] = html.match(this.HTML_PARSE_REGEX); | |
| return token; | |
| }; | |
| // Fetch and parse, expects response as Token (type:String) | |
| get = () => { | |
| return this.fetch().then(this.parse); | |
| }; | |
| // Set tokens to class property to cache and re-use later | |
| set = (token) => { | |
| this.token = token; | |
| return token; | |
| }; | |
| // Asks token, does `get` and `set` token together | |
| ask = () => { | |
| return this.get().then(this.set); | |
| }; | |
| cachedAsk = () => { | |
| if (this.token) { | |
| return this.token; | |
| } | |
| return this.ask(); | |
| }; | |
| // Creates cron task (fake cron with `setInterval`) and returns timer | |
| cronTask = () => { | |
| return setInterval(this.ask, this.CRON_TIMER); | |
| }; | |
| // Creates and attachs task into class property | |
| registerTask = () => { | |
| this.taskTimer = this.cronTask(); | |
| return () => { | |
| clearInterval(this.taskTimer); | |
| this.taskTimer = null; | |
| }; | |
| }; | |
| // Initialize all logics | |
| init = async () => { | |
| await this.ask(); | |
| return this.registerTask(); | |
| }; | |
| } | |
| class DownloadCourse { | |
| URL_MATCH_REGEX = /\/s\/([a-z0-9]+)\//; | |
| constructor(link) { | |
| this.link = link; | |
| this.tokenClass = new TokenFetch(); | |
| } | |
| setToken = (token) => { | |
| this.tokenClass.set(token); | |
| return this; | |
| }; | |
| parseUrl = async (url) => { | |
| const userToken = await this.tokenClass.cachedAsk(); | |
| return url.replace(this.URL_MATCH_REGEX, `/s/${userToken}/`); | |
| }; | |
| } | |
| class ArgsParse { | |
| constructor() { | |
| this.args = {}; | |
| for (let i = 0, len = process.argv.length; i < len; i += 2) { | |
| const key = process.argv[i]; | |
| const value = process.argv[i + 1]; | |
| if (key.startsWith("--")) { | |
| this.args[key.substr(2)] = value || null; | |
| } | |
| } | |
| return this; | |
| } | |
| list = () => { | |
| return this.args; | |
| }; | |
| get = (key) => { | |
| return this.args[key]; | |
| }; | |
| set = (key, value) => { | |
| this.args[key] = value; | |
| return this; | |
| }; | |
| } | |
| async function main() { | |
| const args = new ArgsParse(); | |
| const dl = new DownloadCourse(); | |
| const token = args.get("token"); | |
| const url = args.get("url"); | |
| const help = args.get("help"); | |
| if (help !== undefined) { | |
| console.log("coursehunter.net - Token normalizer script"); | |
| console.log("Made by @dalisoft with love for community"); | |
| console.log("(c) 2020 @dalisoft"); | |
| console.log("Licensed under MIT-License", "\n"); | |
| console.log("Commands:"); | |
| console.log("url [Required] - Download URL of course"); | |
| console.log( | |
| "Example: --url https://dls1.coursehunter.net/s/8f0f260a050519d80207882a14121419/udemy-sg-docker-kubernetes.zip" | |
| ); | |
| console.log( | |
| "Returns: New URL for download course with modified token", | |
| "\n" | |
| ); | |
| console.log("token [Optional] - Set your token"); | |
| console.log("Example: --token 8f0f260a050519d80207882a14121419"); | |
| console.log("`url` and `token` commands should be used together", "\n"); | |
| return; | |
| } | |
| if (token) { | |
| dl.setToken(token); | |
| } | |
| try { | |
| if (url) { | |
| const changedUrl = await dl.parseUrl(url); | |
| console.log(changedUrl); | |
| } | |
| } catch (err) { | |
| console.log(err); | |
| console.log("Failed to get url"); | |
| } | |
| } | |
| main(); |
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