Simple node.js command line vidio.com downloader

package.json

{
  "dependencies": {
    "bluebird": "^3.3.5",
    "chalk": "^1.1.3",
    "concat-files": "^0.1.0",
    "inquirer": "^1.0.2",
    "progress": "^1.1.8"
  }
}

vidio-dl.js

var url = process.argv[2];

// url harus dari vidio.com
if (!url) {
  return console.error("URL cannot be empty");
}

if (!(/^http(s)?:\/\/www\.vidio\.com\/watch\//).test(url)) {
  return console.error("URL is not vidio.com video page");
}

var Promise = require('bluebird');
var ProgressBar = require('progress');
var inquirer = require('inquirer');
var https = require('https');
var fs = require('fs');
var chalk = require('chalk');
var concat = require('concat-files');
var video_resolutions = {};
var temp_files = [];
var result_filename;

function grab(url, message) {
  return new Promise(function(resolve, reject) {
    var req = https.request(url);
    var result = '';
    req.on('response', function(res) {
      if (res.statusCode < 200 || res.statusCode >= 300) {
        reject(new Error("Cannot grab content from statusCode " + res.statusCode));
      }
      if (message) {
        var len = parseInt(res.headers['content-length'], 10);
        var bar = new ProgressBar(message, {
          complete: chalk.green('.'),
          incomplete: ' ',
          width: 3,
          total: len
        });
      }
      res.on('data', function(chunk) {
        if (message) {
          bar.tick(chunk.length);
        }
        result += chunk;
      });
      res.on('end', function() {
        resolve(result);
      });
    });
    req.end();
  });
}

function download(url, file_stream, message) {
  return new Promise(function(resolve, reject) {
    var req = https.request(url);
    req.on('response', function(res) {
      if (res.statusCode < 200 || res.statusCode >= 300) {
        reject(new Error("Cannot download file, statusCode = " + res.statusCode));
      }
      var len = parseInt(res.headers['content-length'], 10);
      var bar = new ProgressBar(message, {
        complete: chalk.green('='),
        incomplete: ' ',
        width: 20,
        total: len
      });
      res.on('data', function(chunk) {
        bar.tick(chunk.length);
      });
      res.on('end', function() {
        resolve(file_stream);
      });
      res.pipe(file_stream);
    });
    req.end();
  });
}

function removeTempFiles() {
  for (i in temp_files) {
    var tmp_file = temp_files[i];
    if (fs.existsSync(tmp_file)) {
      fs.unlinkSync(tmp_file);
    }
  }
}

// remove temp files jika terjadi interupsi (misal: ctrl+C)
process.on('SIGINT', function() {
  removeTempFiles();
  console.log("Caught interrupt signal");
});
// grab url
grab(url, chalk.cyan(">") + " Mengambil informasi halaman :bar")
// scrap url playlist
.then(function(content) {
  return new Promise(function(resolve, reject) {
    var url_data_clip = content.match(/https:\/\/www\.vidio\.com\/videos\/\d+\/playlist\.m3u8/);
    if (!url_data_clip.length) {
      reject(new Error("Cannot find data clip url at that page"));
    } else {
      resolve(url_data_clip[0]);
    }
  })
})
// grab url playlist dan scrap metadata (resolusi video)
.then(function(url_data_clip) {
  return new Promise(function(resolve, reject) {
    grab(url_data_clip).then(function(content) {
      var list_metadata = content.match(/(\#[^\n]+[\n\r\t]*)(https[^\n]+)/g).map(function(match) {
        var split = match.split("\n");
        var data = {
          url: split[1]
        };
        split[0].replace(/^\#/, '').split(',').map(function(metadata) {
          var s = metadata.split('=');
          data[s[0].toLowerCase()] = (s[1] || '').trim().replace(/(^\"|\"$)/g, '');
        });
        return data;
      });
      var resolutions = {};
      list_metadata.forEach(function(metadata) {
        resolutions[metadata.name + " (" + metadata.resolution + ")"] = metadata.url;
      });
      resolve(resolutions);
    })
  });
})
// Propmpt/tanya mau resolusi yang mana?
.then(function(resolutions) {
  return inquirer.prompt({
    type: 'list',
    name: 'resolution',
    message: 'Pilih resolusi video',
    choices: Object.keys(resolutions)
  }).then(function(answer) {
    return Promise.resolve(resolutions[answer.resolution]);
  });
})
// grab dan scrap list url transport stream (.ts)
.then(function(url_video_resolution) {
  return new Promise(function(resolve, reject) {
    grab(url_video_resolution, chalk.cyan(">") + " Mengambil daftar url stream").then(function(result) {
      var urls = result.match(/https:[^\n]+/g);
      // jika urls yang match dengan https tidak ada, mungkin hanya berisi url videonya saja
      if (!urls) {
        var split = url_video_resolution.split('/');
        var file_pattern = new RegExp(split.pop().substr(0, 10) + '[^\n]+', 'g');
        var url_video_directory = split.join('/');
        urls = (result.match(file_pattern) || []).map(function(url) {
          return url_video_directory + '/' + url;
        });
      }
      resolve(urls);
    });
  });
})
// Download semua file .ts ke folder ./temp
.then(function(stream_urls) {
  var count = stream_urls.length;
  var x = 0;
  result_filename = stream_urls[0].split('/').pop().replace(/-\d+\.ts$/, '');
  // var dest = __dirname+'/temp/'+result_filename;
  return Promise.each(stream_urls, function(stream_url) {
    var flags = !fs.existsSync(dest) ? 'w' : 'r+';
    var chunk_filename = stream_url.split('/').pop();
    var message = chalk.cyan("[") + (++x) + chalk.cyan("/") + count + chalk.cyan("] ") + chunk_filename + " [:bar] :percent";
    var sort = '0'.repeat(5 - ('' + x).length) + x;
    var dest = __dirname + '/temp/' + sort + '_' + chunk_filename;
    var file_stream = fs.createWriteStream(dest);
    temp_files.push(dest);
    return download(stream_url, file_stream, message);
  });
})
// concat semua file .ts jadi 1 file 
.then(function(videos) {
  console.log(chalk.cyan(">") + " Menyatukan potongan-potongan video ...");
  concat(temp_files, __dirname + '/' + result_filename, function() {
    console.log(chalk.green("SELESAI!") + " " + result_filename);
    removeTempFiles(); // kalo udah remove temp files
  });
});

penggunaan: node vidio-dl <url-vidio-nya>