Do some browser detection with Ruby. Includes ActionController integration.
gem install browserrequire "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.ios?
browser.app? # request performed by ios' app webview
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 spaceSee 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?
#=> falseThis 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?
endIf 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?
endNotice that you can have multiple conditionals.
Rails.configuration.middleware.use Browser::Middleware do
next if browser.search
6223
_engine?
redirect_to upgrade_path(browser: "oldie") if browser.ie? && !browser.modern?
redirect_to upgrade_path(browser: "oldfx") if browser.firefox? && !browser.modern?
endIf 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
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