Added: youtube-dl-downloader-app (#17)

* Added: youtube-dl-downloader-app

* delete: node_modules | modify: README.md

* add logo

Author: dydgns2017

youtube-dl-downloader-app/.gitignore

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+## dependencies file download
+
+```bash
+$ npm install
+```
+
+## Build
+
+```bash
+$ androidjs b
+```

youtube-dl-downloader-app/README.md

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+
+front.send("hello from front");
+
+front.on("hello from back", function(msg){
+	console.log(msg);
+	$('#msg').html(msg);
+});

youtube-dl-downloader-app/assets/androidjs.js

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+const back = require('androidjs').back;
+const fs = require('fs');
+const ytdl = require('ytdl-core');
+require('magic-globals');
+
+function error_log(msg) {
+	back.send('error-log', msg);
+}
+
+// service define
+// download-mp34 : download mp3, mp4 files
+// download-mp3  : download mp3 file
+// download-mp4  : download mp4 file
+
+// if download result is ok return to service
+// back.send('download-return', result);
+
+// download-mp34 : download mp3, mp4 files
+back.on('download-mp34', (datag)=>{
+	let [movie_dir, music_dir, link_mp4, link_mp3] = datag.split("|");
+	let data;
+	// download
+	data = movie_dir + "|" + link_mp4;
+	download(data, 18, null);
+	data = music_dir + "|" + link_mp3;
+	download(data, 21, ()=>{
+		back.send('download-return', 'success');
+	});
+});
+
+// download-mp3  : download mp3 file
+back.on('download-mp3', (data)=>{
+	// 21, mp3
+	download(data, 21, ()=>{
+		back.send('download-return', 'success');
+	});
+});
+
+// download-mp4  : download mp4 file
+back.on('download-mp4', (data)=>{
+	// 18, mp4
+	download(data, 18, ()=>{
+		back.send('download-return', 'success');
+	});
+});
+
+function download(data, format_num, callback) {
+	let [dir, link] = data.split("|");
+	// for local node test
+	// if (dir == 'window-test')
+	//   dir = process.cwd();
+
+	let format_ext = (format_num == 21) ? 'mp3' : 'mp4';
+	try {
+		ytdl.getInfo(link).then((info, err) => {
+			if (err) error_log(err + "|" + __line);
+			back.send('download-start', 'msg');
+			let fname = info.videoDetails.title.replace('/', '').replace('|', '').toString('utf8');
+			let store = fs.createWriteStream(`${dir}/${fname}.${format_ext}`);
+			store.once('error', (err) => {
+				error_log(err + "|" + "__line");
+			});
+			ytdl(link, { format: format_ext })
+				.pipe(store)
+				.once('finish', () => {
+					return callback();
+				});
+		});
+	} catch (error) {
+		error_log(`${error} | ${__line}`);
+	}
+}