added Client to the request

lib/zero/request.rb

@@ -1,4 +1,5 @@
 require_relative 'request/accept'
+require_relative 'request/client'
 require_relative 'request/parameter'
 
 module Zero
@@ -19,6 +20,10 @@ module Zero
       @path ||= @env[CONST_PATH_INFO]
     end
 
+    def client
+      @client ||= Request::Client.new(@env)
+    end
+
     # get an object representing the parameters of the request
     # @return [Parameter] object having all parameters
     def params

lib/zero/request/client.rb

@@ -0,0 +1,31 @@
+module Zero
+  class Request
+    # This class represents all information about the client of a request.
+    class Client
+      # the key for the ip of the client
+      KEY_REMOTE_ADDR = 'REMOTE_ADDR'
+      # the key for the hostname
+      KEY_REMOTE_HOST = 'REMOTE_HOST'
+      # the key for the user agent
+      KEY_USER_AGENT  = 'HTTP_USER_AGENT'
+
+      # creates a new client with the data of the request environment
+      # @param environment a hash representation of the request
+      def initialize(environment)
+        @address    = environment[KEY_REMOTE_ADDR]
+        @hostname   = environment[KEY_REMOTE_HOST]
+        @user_agent = environment[KEY_USER_AGENT]
+      end
+
+      # the ip address of the client
+      # @return [String] the address of the client
+      attr_reader :address
+      # the hostname of the client
+      # @return [String] the hostname of the client
+      attr_reader :hostname
+      # the user agent of the client
+      # @return [String] the user agent of the client
+      attr_reader :user_agent
+    end
+  end
+end