Ruby selenium

selenium.rb

# crawl images from gogole images search using Selenium
# requirement: geckodriver
# gem: selenium-webdriver nokogiri
require 'selenium-webdriver'
require 'nokogiri'
require 'open-uri'
require 'securerandom'

driver = Selenium::WebDriver.for :firefox
driver.navigate.to "https://www.google.com/search?tbm=isch&q=single logos"


element = driver.find_element(tag_name: 'body')
50.times do
  element.send_keys([:page_down])
  sleep 0.3
end

source = driver.page_source

doc = Nokogiri.HTML(source)
doc.search('img').each do |link|
  src = link.attr('src')
  if src and src.start_with?("http")
    File.open("logos/#{SecureRandom.uuid}.png", "wb") do |f|
      puts src
      f.write(open(src).read)
    end
  end
end

driver.quit