unsupported_browser.rb

# Detect unsuppoerted browsers exculding crawlers and chrome frame
# browser gem - https://github.com/fnando/browser

def is_unsupported_browser?
  is_ie = browser.ie6? || browser.ie7? || browser.ie8?
  is_firefox36 = browser.firefox? && browser.full_version.match(/^3.6.*/)
  is_crawler = request.env["HTTP_USER_AGENT"].match(/\(.*https?:\/\/.*\)/) if request.env["HTTP_USER_AGENT"]
  has_chrome_frame = request.env["HTTP_USER_AGENT"].match(/chromeframe/) if request.env["HTTP_USER_AGENT"]

  return !has_chrome_frame && (is_ie || is_firefox36) unless is_crawler
end