Fontspring WOFF downloader

sorry_fontspring.rb

require 'nokogiri'
require 'open-uri'
require 'base64'

url = ARGV[0]
abort 'Supply a Fontspring URL' if url.nil?
page = Nokogiri::HTML(open(url)) rescue nil
abort 'Fontspring URL is invalid' if page.nil?
faces = page.css('#ffdemo_select option').to_a
abort 'No fonts faces found' if faces.empty?

faces.each do |node|
  name = node.content
  id = node['value']
  print "Downloading #{name}... "
  url = "http://www.fontspring.com/ffdemo/iframe/#{id}"
  demo = Nokogiri::HTML(open(url)) rescue nil
  next puts 'webfont demo page not found; skipping!' if demo.nil?
  link = demo.css('link').first
  next puts 'webfont link tag not found; skipping!' if link.nil?
  link = "http://www.fontspring.com#{link['href']}"
  face = open(link) { |f| f.read } rescue nil
  next puts 'font face not found; skipping!' if face.nil?
  matches = face.match(/url\(data:font\/woff;charset=utf-8;base64,([^\)]*)\)/)
  enc = matches && matches[1]
  next puts 'invalid font face; skipping!' if enc.nil? || enc.empty?
  raw = Base64.decode64(enc) rescue nil
  next puts 'invalid base 64; skipping!' if raw.nil?
  File.open("#{name}.woff", 'wb') { |f| f.write(raw) }
  puts 'done!'
end