getFile

getFile.coffee

fs = require 'fs'
urlLib = require 'url'
path = require 'path'
mkdirp = require 'mkdirp'
downloader = require 'downloader'

exports.get = ({ url, dir, onDownload }, callback) ->

  onDownload ?= (callback) -> callback()
  {pathname} = urlLib.parse(url)
  filename = path.basename(pathname)
  fullpath = path.resolve(__dirname, dir, filename)
  dirname = path.dirname(fullpath)

  mkdirp dirname, (err) ->
    return callback(err) if err?

    fs.exists fullpath, (exists) ->
      if exists
        callback(null, fullpath)
      else
        onDownload ->
          downloader.on 'done', ->
            callback(null, fullpath)

          downloader.on 'error', (msg) ->
            callback(msg)

          downloader.download(url, dirname + '/')