User-Agent 解析庫：DeviceDetector

DeviceDetector 是一個用 Ruby 編寫的用來解析各種設備 User-Agent 信息的庫，基于及時更新和龐大的 user-agent 庫。使用 DeviceDetector 可探測設備瀏覽器、操作系統、設備類型（桌面、平板、移動、電視、汽車、控制臺等）、品牌和型號。

示例代碼：

user_agent = 'Mozilla/5.0 (Windows NT 6.2; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/30.0.1599.17 Safari/537.36'
client = DeviceDetector.new(user_agent)

client.name # => 'Chrome'
client.full_version # => '30.0.1599.69'

client.os_name # => 'Windows'
client.os_full_version # => '8'

# For many devices, you can also query the device name (usually the model name)
client.device_name # => 'iPhone 5'
# Device types can be one of the following: smartphone, tablet, console, 
# portable media player, tv, car browser, camera
client.device_type # => 'smartphone'

為了提升性能，DeviceDetector 可以把 UserAgent 信息放到緩存中：

DeviceDetector.configure do |config|
  config.max_cache_keys = 5_000 
  # increment this if you have enough RAM, proceed with care
end

項目主頁：http://www.baiduhome.net/lib/view/home/1426930006867