X-Git-Url: https://projects.mako.cc/source/selectricity-live/blobdiff_plain/baf9ff0ec39c13f52ee8d4f087641dc5fcc9c53b..fcc68b4dc198b7cb0cf93467d96038b0844675fe:/vendor/plugins/geokit/lib/geo_kit/geocoders.rb

diff --git a/vendor/plugins/geokit/lib/geo_kit/geocoders.rb b/vendor/plugins/geokit/lib/geo_kit/geocoders.rb
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+++ b/vendor/plugins/geokit/lib/geo_kit/geocoders.rb
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+require 'net/http'
+require 'rexml/document'
+require 'yaml'
+require 'timeout'
+
+module GeoKit
+  # Contains a set of geocoders which can be used independently if desired.  The list contains:
+  # 
+  # * Google Geocoder - requires an API key.
+  # * Yahoo Geocoder - requires an API key.
+  # * Geocoder.us - may require authentication if performing more than the free request limit.
+  # * Geocoder.ca - for Canada; may require authentication as well.
+  # * IP Geocoder - geocodes an IP address using hostip.info's web service.
+  # * Multi Geocoder - provides failover for the physical location geocoders.
+  # 
+  # Some configuration is required for these geocoders and can be located in the environment
+  # configuration files.
+  module Geocoders
+    @@proxy_addr = nil
+    @@proxy_port = nil
+    @@proxy_user = nil
+    @@proxy_pass = nil
+    @@timeout = nil    
+    @@yahoo = 'REPLACE_WITH_YOUR_YAHOO_KEY'
+    @@google = 'REPLACE_WITH_YOUR_GOOGLE_KEY'
+    @@geocoder_us = false
+    @@geocoder_ca = false
+    @@provider_order = [:google,:us]
+    
+    [:yahoo, :google, :geocoder_us, :geocoder_ca, :provider_order, :timeout, 
+     :proxy_addr, :proxy_port, :proxy_user, :proxy_pass].each do |sym|
+      class_eval <<-EOS, __FILE__, __LINE__
+        def self.#{sym}
+          if defined?(#{sym.to_s.upcase})
+            #{sym.to_s.upcase}
+          else
+            @@#{sym}
+          end
+        end
+
+        def self.#{sym}=(obj)
+          @@#{sym} = obj
+        end
+      EOS
+    end
+    
+    # Error which is thrown in the event a geocoding error occurs.
+    class GeocodeError < StandardError; end
+    
+    # The Geocoder base class which defines the interface to be used by all
+    # other geocoders.
+    class Geocoder   
+      # Main method which calls the do_geocode template method which subclasses
+      # are responsible for implementing.  Returns a populated GeoLoc or an
+      # empty one with a failed success code.
+      def self.geocode(address)  
+        res = do_geocode(address)
+        return res.success ? res : GeoLoc.new
+      end  
+      
+      # Call the geocoder service using the timeout if configured.
+      def self.call_geocoder_service(url)
+        timeout(GeoKit::Geocoders::timeout) { return self.do_get(url) } if GeoKit::Geocoders::timeout        
+        return self.do_get(url)
+      rescue TimeoutError
+        return nil  
+      end
+
+      protected
+
+      def self.logger() RAILS_DEFAULT_LOGGER; end
+      
+      private
+      
+      # Wraps the geocoder call around a proxy if necessary.
+      def self.do_get(url)     
+        return Net::HTTP::Proxy(GeoKit::Geocoders::proxy_addr, GeoKit::Geocoders::proxy_port,
+            GeoKit::Geocoders::proxy_user, GeoKit::Geocoders::proxy_pass).get_response(URI.parse(url))          
+      end
+      
+      # Adds subclass' geocode method making it conveniently available through 
+      # the base class.
+      def self.inherited(clazz)
+        class_name = clazz.name.split('::').last
+        src = <<-END_SRC
+          def self.#{class_name.underscore}(address)
+            #{class_name}.geocode(address)
+          end
+        END_SRC
+        class_eval(src)
+      end
+    end
+    
+    # Geocoder CA geocoder implementation.  Requires the GeoKit::Geocoders::GEOCODER_CA variable to
+    # contain true or false based upon whether authentication is to occur.  Conforms to the 
+    # interface set by the Geocoder class.
+    #
+    # Returns a response like:
+    # <?xml version="1.0" encoding="UTF-8" ?>
+    # <geodata>
+    #   <latt>49.243086</latt>
+    #   <longt>-123.153684</longt>
+    # </geodata>
+    class CaGeocoder < Geocoder
+
+      private
+
+      # Template method which does the geocode lookup.
+      def self.do_geocode(address)
+        raise ArgumentError('Geocoder.ca requires a GeoLoc argument') unless address.is_a?(GeoLoc)
+        url = construct_request(address)
+        res = self.call_geocoder_service(url)
+        return GeoLoc.new if !res.is_a?(Net::HTTPSuccess)
+        xml = res.body
+        logger.debug "Geocoder.ca geocoding. Address: #{address}. Result: #{xml}"
+        # Parse the document.
+        doc = REXML::Document.new(xml)    
+        address.lat = doc.elements['//latt'].text
+        address.lng = doc.elements['//longt'].text
+        address.success = true
+        return address
+      rescue
+        logger.error "Caught an error during Geocoder.ca geocoding call: "+$!
+        return GeoLoc.new  
+      end  
+
+      # Formats the request in the format acceptable by the CA geocoder.
+      def self.construct_request(location)
+        url = ""
+        url += add_ampersand(url) + "stno=#{location.street_number}" if location.street_address
+        url += add_ampersand(url) + "addresst=#{CGI.escape(location.street_name)}" if location.street_address
+        url += add_ampersand(url) + "city=#{CGI.escape(location.city)}" if location.city
+        url += add_ampersand(url) + "prov=#{location.state}" if location.state
+        url += add_ampersand(url) + "postal=#{location.zip}" if location.zip
+        url += add_ampersand(url) + "auth=#{GeoKit::Geocoders::geocoder_ca}" if GeoKit::Geocoders::geocoder_ca
+        url += add_ampersand(url) + "geoit=xml"
+        'http://geocoder.ca/?' + url
+      end
+
+      def self.add_ampersand(url)
+        url && url.length > 0 ? "&" : ""
+      end
+    end    
+    
+    # Google geocoder implementation.  Requires the GeoKit::Geocoders::GOOGLE variable to
+    # contain a Google API key.  Conforms to the interface set by the Geocoder class.
+    class GoogleGeocoder < Geocoder
+
+      private 
+
+      # Template method which does the geocode lookup.
+      def self.do_geocode(address)
+        address_str = address.is_a?(GeoLoc) ? address.to_geocodeable_s : address
+        res = self.call_geocoder_service("http://maps.google.com/maps/geo?q=#{CGI.escape(address_str)}&output=xml&key=#{GeoKit::Geocoders::google}&oe=utf-8")
+#        res = Net::HTTP.get_response(URI.parse("http://maps.google.com/maps/geo?q=#{CGI.escape(address_str)}&output=xml&key=#{GeoKit::Geocoders::google}&oe=utf-8"))
+        return GeoLoc.new if !res.is_a?(Net::HTTPSuccess)
+        xml=res.body
+        logger.debug "Google geocoding. Address: #{address}. Result: #{xml}"
+        doc=REXML::Document.new(xml)
+
+        if doc.elements['//kml/Response/Status/code'].text == '200'
+          res = GeoLoc.new
+          coordinates=doc.elements['//coordinates'].text.to_s.split(',')
+
+          #basics
+          res.lat=coordinates[1]
+          res.lng=coordinates[0]
+          res.country_code=doc.elements['//CountryNameCode'].text
+          res.provider='google'
+
+          #extended -- false if not not available
+          res.city = doc.elements['//LocalityName'].text if doc.elements['//LocalityName']
+          res.state = doc.elements['//AdministrativeAreaName'].text if doc.elements['//AdministrativeAreaName']
+          res.full_address = doc.elements['//address'].text if doc.elements['//address'] # google provides it
+          res.zip = doc.elements['//PostalCodeNumber'].text if doc.elements['//PostalCodeNumber']
+          res.street_address = doc.elements['//ThoroughfareName'].text if doc.elements['//ThoroughfareName']
+          # Translate accuracy into Yahoo-style token address, street, zip, zip+4, city, state, country
+          # For Google, 1=low accuracy, 8=high accuracy
+          address_details=doc.elements['//AddressDetails','urn:oasis:names:tc:ciq:xsdschema:xAL:2.0']
+          accuracy = address_details ? address_details.attributes['Accuracy'].to_i : 0
+          res.precision=%w{unknown country state state city zip zip+4 street address}[accuracy]
+          res.success=true
+          
+          return res
+        else 
+          logger.info "Google was unable to geocode address: "+address
+          return GeoLoc.new
+        end
+
+        rescue
+          logger.error "Caught an error during Google geocoding call: "+$!
+          return GeoLoc.new
+      end  
+    end
+    
+    # Provides geocoding based upon an IP address.  The underlying web service is a hostip.info
+    # which sources their data through a combination of publicly available information as well
+    # as community contributions.
+    class IpGeocoder < Geocoder 
+
+      private 
+
+      # Given an IP address, returns a GeoLoc instance which contains latitude,
+      # longitude, city, and country code.  Sets the success attribute to false if the ip 
+      # parameter does not match an ip address.  
+      def self.do_geocode(ip)
+        return GeoLoc.new unless /^(\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})?$/.match(ip)
+        url = "http://api.hostip.info/get_html.php?ip=#{ip}&position=true"
+        response = self.call_geocoder_service(url)
+        response.is_a?(Net::HTTPSuccess) ? parse_body(response.body) : GeoLoc.new
+      rescue
+        logger.error "Caught an error during HostIp geocoding call: "+$!
+        return GeoLoc.new
+      end
+
+      # Converts the body to YAML since its in the form of:
+      #
+      # Country: UNITED STATES (US)
+      # City: Sugar Grove, IL
+      # Latitude: 41.7696
+      # Longitude: -88.4588
+      #
+      # then instantiates a GeoLoc instance to populate with location data.
+      def self.parse_body(body) # :nodoc:
+        yaml = YAML.load(body)
+        res = GeoLoc.new
+        res.provider = 'hostip'
+        res.city, res.state = yaml['City'].split(', ')
+        country, res.country_code = yaml['Country'].split(' (')
+        res.lat = yaml['Latitude'] 
+        res.lng = yaml['Longitude']
+        res.country_code.chop!
+        res.success = res.city != "(Private Address)"
+        res
+      end
+    end
+    
+    # Geocoder Us geocoder implementation.  Requires the GeoKit::Geocoders::GEOCODER_US variable to
+    # contain true or false based upon whether authentication is to occur.  Conforms to the 
+    # interface set by the Geocoder class.
+    class UsGeocoder < Geocoder
+
+      private
+
+      # For now, the geocoder_method will only geocode full addresses -- not zips or cities in isolation
+      def self.do_geocode(address)
+        address_str = address.is_a?(GeoLoc) ? address.to_geocodeable_s : address
+        url = "http://"+(GeoKit::Geocoders::geocoder_us || '')+"geocoder.us/service/csv/geocode?address=#{CGI.escape(address_str)}"
+        res = self.call_geocoder_service(url)
+        return GeoLoc.new if !res.is_a?(Net::HTTPSuccess)
+        data = res.body
+        logger.debug "Geocoder.us geocoding. Address: #{address}. Result: #{data}"
+        array = data.chomp.split(',')
+
+        if array.length == 6  
+          res=GeoLoc.new
+          res.lat,res.lng,res.street_address,res.city,res.state,res.zip=array
+          res.country_code='US'
+          res.success=true 
+          return res
+        else 
+          logger.info "geocoder.us was unable to geocode address: "+address
+          return GeoLoc.new      
+        end
+        rescue 
+          logger.error "Caught an error during geocoder.us geocoding call: "+$!
+          return GeoLoc.new
+      end
+    end
+    
+    # Yahoo geocoder implementation.  Requires the GeoKit::Geocoders::YAHOO variable to
+    # contain a Yahoo API key.  Conforms to the interface set by the Geocoder class.
+    class YahooGeocoder < Geocoder
+
+      private 
+
+      # Template method which does the geocode lookup.
+      def self.do_geocode(address)
+        address_str = address.is_a?(GeoLoc) ? address.to_geocodeable_s : address
+        url="http://api.local.yahoo.com/MapsService/V1/geocode?appid=#{GeoKit::Geocoders::yahoo}&location=#{CGI.escape(address_str)}"
+        res = self.call_geocoder_service(url)
+        return GeoLoc.new if !res.is_a?(Net::HTTPSuccess)
+        xml = res.body
+        doc = REXML::Document.new(xml)
+        logger.debug "Yahoo geocoding. Address: #{address}. Result: #{xml}"
+
+        if doc.elements['//ResultSet']
+          res=GeoLoc.new
+
+          #basic      
+          res.lat=doc.elements['//Latitude'].text
+          res.lng=doc.elements['//Longitude'].text
+          res.country_code=doc.elements['//Country'].text
+          res.provider='yahoo'  
+
+          #extended - false if not available
+          res.city=doc.elements['//City'].text if doc.elements['//City'] && doc.elements['//City'].text != nil
+          res.state=doc.elements['//State'].text if doc.elements['//State'] && doc.elements['//State'].text != nil
+          res.zip=doc.elements['//Zip'].text if doc.elements['//Zip'] && doc.elements['//Zip'].text != nil
+          res.street_address=doc.elements['//Address'].text if doc.elements['//Address'] && doc.elements['//Address'].text != nil
+          res.precision=doc.elements['//Result'].attributes['precision'] if doc.elements['//Result']
+          res.success=true
+          return res
+        else 
+          logger.info "Yahoo was unable to geocode address: "+address
+          return GeoLoc.new
+        end   
+
+        rescue 
+          logger.info "Caught an error during Yahoo geocoding call: "+$!
+          return GeoLoc.new
+      end
+    end
+    
+    # Provides methods to geocode with a variety of geocoding service providers, plus failover
+    # among providers in the order you configure.
+    # 
+    # Goal:
+    # - homogenize the results of multiple geocoders
+    # 
+    # Limitations:
+    # - currently only provides the first result. Sometimes geocoders will return multiple results.
+    # - currently discards the "accuracy" component of the geocoding calls
+    class MultiGeocoder < Geocoder 
+      private
+
+      # This method will call one or more geocoders in the order specified in the 
+      # configuration until one of the geocoders work.
+      # 
+      # The failover approach is crucial for production-grade apps, but is rarely used.
+      # 98% of your geocoding calls will be successful with the first call  
+      def self.do_geocode(address)
+        GeoKit::Geocoders::provider_order.each do |provider|
+          begin
+            klass = GeoKit::Geocoders.const_get "#{provider.to_s.capitalize}Geocoder"
+            res = klass.send :geocode, address
+            return res if res.success
+          rescue
+            logger.error("Something has gone very wrong during geocoding, OR you have configured an invalid class name in GeoKit::Geocoders::provider_order. Address: #{address}. Provider: #{provider}")
+          end
+        end
+        # If we get here, we failed completely.
+        GeoLoc.new
+      end
+    end   
+  end
+end
\ No newline at end of file