Do some browser detection with Ruby. Includes ActionController integration.
gem install browser
require "rubygems"
require "browser"
browser = Browser.new(:ua => "some string", :accept_language => "en-us")
browser.name # readable browser name
browser.version # major version number
browser.full_version
browser.safari?
browser.opera?
browser.chrome?
browser.chrome_os?
browser.mobile?
browser.tablet?
browser.console?
browser.firefox?
browser.ie?
browser.ie?(6) # detect specific IE version
browser.edge? # Newest MS browser
browser.modern? # Webkit, Firefox 17+, IE 9+ and Opera 12+
browser.platform # return :mac, :windows, :linux or :other
browser.ios? # detect iOS
browser.ios?(9) # detect specific iOS version
browser.mac?
browser.windows?
browser.windows_x64?
browser.linux?
browser.blackberry?
browser.blackberry?(10) # detect specific BlackBerry version
browser.bot?
browser.search_engine?
browser.phantom_js?
browser.quicktime?
browser.core_media?
browser.silk?
browser.android?
browser.android?(4.2) # detect Android Jelly Bean 4.2
browser.known? # has the browser been successfully detected?
browser.meta # an array with several attributes
browser.to_s # the meta info joined by space
See the tests and implementation for more examples.
The current rules that define a modern browser are pretty loose:
- Webkit
- IE9+
- Microsoft Edge
- Firefox 17+
- Firefox Tablet 14+
- Opera 12+
You can define your own rules. A rule must be a proc/lambda or any object that implements the method === and accepts the browser object. To redefine all rules, clear the existing rules before adding your own.
# Only Chrome Canary is considered modern.
Browser.modern_rules.clear
Browser.modern_rules << -> b { b.chrome? && b.version.to_i >= 37 }
Just add it to the Gemfile.
gem "browser"
This adds a helper method called browser
, that inspects your current user agent.
<% if browser.ie?(6) %>
<p class="disclaimer">You're running an older IE version. Please update it!</p>
<% end %>
Internet Explorer has a compatibility view mode that allows newer versions (IE8+) to run as an older version. Browser will always return the navigator version, ignoring the compatibility view version, when defined. If you need to get the engine's version, you have to use Browser#msie_version
and Browser#msie_full_version
.
So, let's say an user activates compatibility view in a IE11 browser. This is what you'll get:
browser.version
#=> 11
browser.full_version
#=> 11.0
browser.msie_version
#=> 7
browser.msie_full_version
#=> 7.0
browser.compatibility_view?
#=> true
browser.modern?
#=> false
This behavior changed in v1.0.0
; previously there wasn't a way of getting the real browser version.
Browser used to detect empty user agents as bots, but this behaviour has changed. If you want to bring this detection back, you can activate it through the following call:
Browser::Bots.detect_empty_ua!
You can use the Browser::Middleware
to redirect user agents.
use Browser::Middleware do
redirect_to "/upgrade" unless browser.modern?
end
If you're using Rails, you can use the route helper methods. Just add something like the following to a initializer file (config/initializers/browser.rb
).
Rails.configuration.middleware.use Browser::Middleware do
redirect_to upgrade_path unless browser.modern?
end
Notice that you can have multiple conditionals.
Rails.configuration.middleware.use Browser::Middleware do
next if browser.search_engine?
redirect_to upgrade_path(browser: "oldie") if browser.ie? && !browser.modern?
redirect_to upgrade_path(browser: "oldfx") if browser.firefox? && !browser.modern?
end
If you need acccess to the Rack::Request
object (e.g. to exclude a path), you can do so with request
.
Rails.configuration.middleware.use Browser::Middleware do
redirect_to upgrade_path unless browser.modern? || request.env['PATH_INFO'] == '/exclude_me'
end
- Nando Vieira - http://nandovieira.com.br
(The MIT License)
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the 'Software'), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
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