Download Wallpapers from Blizzard

download.js

const range = require('lodash.range');
const flatten = require('flatten');
const Promise = require('bluebird');
const fs = require('fs');

const RANGE = 60;
const RESOLUTIONS = ['1440x900','1600x900'];
const STATUS_OK = 200;
const ENCODING_FILE = 'binary';

const request = Promise.promisify(require('request'));
const writeFile = Promise.promisify(fs.writeFile);
Array.prototype.flatten = function(){return flatten(this);};


Promise.all(
  range(RANGE)
    .map(number => {
      return RESOLUTIONS.map(resolution => `http://media.blizzard.com/sc2/media/wallpapers/wall0${number}/wall0${number}-${resolution}.jpg`);
    })
    .flatten()
    .map(url => request({url,encoding: ENCODING_FILE}))
)
.filter(req => req.statusCode === STATUS_OK)
.map((req, index) =>  writeFile(`${__dirname}/${index}.jpg`, req.body, ENCODING_FILE))
.catch(console.error.bind(console));

package.json

{
  "name": "imagenes",
  "private": true,
  "version": "1.0.0",
  "description": "",
  "main": "download.js",
  "scripts": {
    "start": "node download"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "dependencies": {
    "bluebird": "3.1.1",
    "flatten": "0.0.1",
    "lodash.range": "3.0.1",
    "request": "2.67.0"
  }
}