Add Google Map of voters

[selectricity-live] / vendor / plugins / geokit / lib / geo_kit / ip_geocode_lookup.rb

diff --git a/vendor/plugins/geokit/lib/geo_kit/ip_geocode_lookup.rb b/vendor/plugins/geokit/lib/geo_kit/ip_geocode_lookup.rb
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+++ b/vendor/plugins/geokit/lib/geo_kit/ip_geocode_lookup.rb
@@ -0,0 +1,46 @@
+require 'yaml'
+
+module GeoKit 
+  # Contains a class method geocode_ip_address which can be used to enable automatic geocoding
+  # for request IP addresses.  The geocoded information is stored in a cookie and in the 
+  # session to minimize web service calls.  The point of the helper is to enable location-based
+  # websites to have a best-guess for new visitors.
+  module IpGeocodeLookup
+    # Mix below class methods into ActionController.
+    def self.included(base) # :nodoc:
+      base.extend ClassMethods
+    end
+    
+    # Class method to mix into active record.
+    module ClassMethods # :nodoc:
+      def geocode_ip_address(filter_options = {})
+        before_filter :store_ip_location
+      end
+    end
+ 
+    private   
+         
+    # Places the IP address' geocode location into the session if it 
+    # can be found.  Otherwise, looks for a geo location cookie and
+    # uses that value.  The last resort is to call the web service to
+    # get the value.
+    def store_ip_location
+      session[:geo_location] ||= retrieve_location_from_cookie_or_service
+      cookies[:geo_location] = { :value => session[:geo_location].to_yaml, :expires => 30.days.from_now } if session[:geo_location]
+    end    
+    
+    # Uses the stored location value from the cookie if it exists.  If
+    # no cookie exists, calls out to the web service to get the location. 
+    def retrieve_location_from_cookie_or_service
+      return YAML.load(cookies[:geo_location]) if cookies[:geo_location]
+      location = Geocoders::IpGeocoder.geocode(get_ip_address)
+      return location.success ? location : nil
+    end
+    
+    # Returns the real ip address, though this could be the localhost ip
+    # address.  No special handling here anymore.
+    def get_ip_address
+      request.remote_ip
+    end
+  end
+end
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