gistfile1.rb

#!/usr/bin/env ruby

# Installation:
# -`gem install httparty`
# -Install ImageMagick
# -`gem install mini_magick` + test (more info: https://github.com/minimagick/minimagick)
# -Configure DESTINATION_FILEPATH
# -Run it.

require 'httparty'
require 'json'
require 'mini_magick'

APP_STORE_IDS = { "tinder" => 547702041,
                  "merchbar" => 879654508,
                  "alltrails" => 405075943,
                  "livingsocial" => 340295413}

# requires trailing slash (i.e. '/foo/bar/`)
DESTINATION_FILEPATH = '/Users/josh/Development/iamjosh/source/images/app_icons/'

##########################################
# DO NOT EDIT BELOW THIS LINE
##########################################

APP_STORE_IDS.each do |key, app_store_id|
  app_store_response = HTTParty.get("https://itunes.apple.com/lookup?id=" + app_store_id.to_s)

  if app_store_response.success?
    json = JSON.parse(app_store_response.body)
    
    app_icon_url = json['results'].first['artworkUrl512']

    app_icon_response = HTTParty.get(app_icon_url)
    
    if app_icon_response.success?
      app_icon = MiniMagick::Image.read(app_icon_response.parsed_response)
      app_icon.resize "175x175"
      app_icon.write(DESTINATION_FILEPATH + key + ".png")
    end
  end
end