render about page for robots (#19)

Gemfile

@@ -6,6 +6,7 @@ gem 'thin'
 gem 'faye'
 gem 'faye-redis'
 gem 'migrant'
+gem 'nokogiri'
 
 # Assets dependencies
 group :assets do

Gemfile.lock

@@ -287,6 +287,7 @@ DEPENDENCIES
   jquery-rails
   migrant
   newrelic_rpm
+  nokogiri
   pg
   pry-rails
   pry-remote

app/controllers/application_controller.rb

@@ -3,7 +3,24 @@ class ApplicationController < ActionController::Base
 
   private
 
+  #
+  # Methods
+  #
+
+  # Return instance of Faye client
+  #
+  # @return [Faye::Client] Faye client instance
   def faye_client
     @faye_client ||= env['faye.client']
   end
+
+  # Return a list of robots user agents strings
+  #
+  # @return [Array<String>] array of user agent string
+  def robots
+    Rails.cache.fetch('useragents_bots', expires_in: 1.month) do
+      data = Nokogiri::HTML(Net::HTTP.get_response(URI.parse('http://www.user-agents.org/allagents.xml')).body)
+      data.xpath('//user-agent/type[contains(text(),"R")]/../string/text() |  /user-agent/type[contains(text(),"C")]/../string/text()').map(&:to_s)
+    end
+  end
 end

app/controllers/home_controller.rb

@@ -1,16 +1,13 @@
 class HomeController < ApplicationController
-	def demo
-	end
+  def about
+    render 'about'
+  end	
 
-	def presentation
-		render "presentation", layout: false
-	end
+  def presentation
+    render 'presentation', layout: false
+  end
 
-	def startup
-		render "startup", layout: false
-	end
-
-	def about
-		render "about"
-	end	
+  def startup
+    render 'startup', layout: false
+  end
 end

app/controllers/timer_controller.rb

@@ -2,6 +2,8 @@ class TimerController < ApplicationController
   respond_to :json, only: [:event]
   respond_to :html, only: [:index, :show]
 
+  before_filter :check_robots
+
   def index
     @timer = Timer.create!
     redirect_to timer_url(@timer.url_key)
@@ -36,6 +38,13 @@ def event
 
   private
 
+  #
+  # Methods
+  #
+
+  # Send event to all registred timer
+  #
+  # @return [Boolean] return false if params is invalid
   def publish_timer_action(url_key, timer = {})
     if !%(start stop reset).include?(timer[:event]) || (timer[:time] && !timer[:time].is_a?(Hash))
       false
@@ -49,4 +58,25 @@ def publish_timer_action(url_key, timer = {})
     end
   end
 
+  #
+  # Filters
+  #
+
+  # Render about page when visited by a bot
+  #
+  # @return [Boolean] return false when a robot is detected
+  def check_robots
+    if robots.include?(request.user_agent)
+      if request.path == root_path
+        render 'home/about'
+      else
+        redirect_to root_url, status: :moved_permanently
+      end
+
+      false
+    else
+      true
+    end
+  end
+
 end