class GeocoderController < ApplicationController
- layout 'site'
-
+ require 'uri'
require 'net/http'
require 'rexml/document'
+ POSTCODE_ZOOM = 15
+ GEONAMES_ZOOM = 12
+
def search
- res_hash = {}
- @postcode_arr = []
- @res_ary = []
-
- if params[:query][:postcode]
- postcode = params[:query][:postcode]
- escaped_postcode = postcode.sub(/\s/,'%20')
- if postcode.match(/(^\d{5}$)|(^\d{5}-\d{4}$)/)
- #its a zip code - do something
+ query = params[:query]
+ results = Array.new
+
+ if query.match(/^\d{5}(-\d{4})?$/)
+ results.push search_us_postcode(query)
+ elsif query.match(/(GIR 0AA|[A-PR-UWYZ]([0-9]{1,2}|([A-HK-Y][0-9]|[A-HK-Y][0-9]([0-9]|[ABEHMNPRV-Y]))|[0-9][A-HJKS-UW])\s*[0-9][ABD-HJLNP-UW-Z]{2})/i)
+ results.push search_uk_postcode(query)
+ results.push search_osm_namefinder(query)
+ elsif query.match(/[A-Z]\d[A-Z]\s*\d[A-Z]\d/i)
+ results.push search_ca_postcode(query)
+ else
+ results.push search_osm_namefinder(query)
+ results.push search_geonames(query)
+ end
+
+ results_count = count_results(results)
+
+ render :update do |page|
+ page.replace_html :sidebar_content, :partial => 'results', :object => results
+
+ if results_count == 1
+ position = results.collect { |s| s[:results] }.compact.flatten[0]
+ page.call "setPosition", position[:lat].to_f, position[:lon].to_f, position[:zoom].to_i
else
- # Assume it's a UK postcode.
- # Fairly naive regexp is: \w{1,2}\d+\w?\s?\d\w\w
-
- # Ask npemap to do a combined npemap + freethepostcode search
- Net::HTTP.start('www.npemap.org.uk') do |http|
- resp = http.get("/cgi/geocoder.fcgi?format=text&postcode=#{escaped_postcode}")
- dataline = resp.body.split(/\n/)[1]
- data = dataline.split(/,/) # easting,northing,postcode,lat,long
- lat = data[3]
- lon = data[4]
- $stderr.print postcode
- $stderr.print dataline
- redirect_to "/index.html?lat=#{lat}&lon=#{lon}&zoom=14"
- end
+ page.call "openSidebar"
end
- else
- if params[:query][:place_name] != nil or ""
- place_name = params[:query][:place_name]
- Net::HTTP.start('ws.geonames.org') do |http|
- res = http.get("/search?q=#{place_name}&maxRows=10")
- xml = REXML::Document.new(res.body)
- xml.elements.each("geonames/geoname") do |ele|
- res_hash = {}
- ele.elements.each("name"){ |n| res_hash['name'] = n.text }
- ele.elements.each("countryCode"){ |n| res_hash['country_code'] = n.text }
- ele.elements.each("countryNode"){ |n| res_hash['country_name'] = n.text }
- ele.elements.each("lat"){ |n| res_hash['lat'] = n.text }
- ele.elements.each("lng"){ |n| res_hash['lon']= n.text }
- @res_ary << res_hash
- end
+ end
+ end
+
+ def description
+ results = Array.new
+
+ lat = params[:lat]
+ lon = params[:lon]
+
+ results.push description_osm_namefinder("cities", lat, lon, 2)
+ results.push description_osm_namefinder("towns", lat, lon, 4)
+ results.push description_osm_namefinder("places", lat, lon, 10)
+ results.push description_geonames(lat, lon)
+
+ render :update do |page|
+ page.replace_html :sidebar_content, :partial => 'results', :object => results
+ page.call "openSidebar"
+ end
+ end
+
+private
+
+ def search_us_postcode(query)
+ results = Array.new
+
+ # ask geocoder.us (they have a non-commercial use api)
+ response = fetch_text("http://rpc.geocoder.us/service/csv?zip=#{escape_query(query)}")
+
+ # parse the response
+ unless response.match(/couldn't find this zip/)
+ data = response.split(/\s*,\s+/) # lat,long,town,state,zip
+ results.push({:lat => data[0], :lon => data[1], :zoom => POSTCODE_ZOOM,
+ :prefix => "#{data[2]}, #{data[3]}, ",
+ :name => data[4]})
+ end
+
+ return { :source => "Geocoder.us", :url => "http://geocoder.us/", :results => results }
+ rescue Exception => ex
+ return { :source => "Geocoder.us", :url => "http://geocoder.us/", :error => "Error contacting rpc.geocoder.us: #{ex.to_s}" }
+ end
+
+ def search_uk_postcode(query)
+ results = Array.new
+
+ # ask npemap.org.uk to do a combined npemap + freethepostcode search
+ response = fetch_text("http://www.npemap.org.uk/cgi/geocoder.fcgi?format=text&postcode=#{escape_query(query)}")
+
+ # parse the response
+ unless response.match(/Error/)
+ dataline = response.split(/\n/)[1]
+ data = dataline.split(/,/) # easting,northing,postcode,lat,long
+ postcode = data[2].gsub(/'/, "")
+ zoom = POSTCODE_ZOOM - postcode.count("#")
+ results.push({:lat => data[3], :lon => data[4], :zoom => zoom,
+ :name => postcode})
+ end
+
+ return { :source => "NPEMap / FreeThePostcode", :url => "http://www.npemap.org.uk/", :results => results }
+ rescue Exception => ex
+ return { :source => "NPEMap / FreeThePostcode", :url => "http://www.npemap.org.uk/", :error => "Error contacting www.npemap.org.uk: #{ex.to_s}" }
+ end
+
+ def search_ca_postcode(query)
+ results = Array.new
+
+ # ask geocoder.ca (note - they have a per-day limit)
+ response = fetch_xml("http://geocoder.ca/?geoit=XML&postal=#{escape_query(query)}")
+
+ # parse the response
+ if response.get_elements("geodata/error").empty?
+ results.push({:lat => response.get_text("geodata/latt").to_s,
+ :lon => response.get_text("geodata/longt").to_s,
+ :zoom => POSTCODE_ZOOM,
+ :name => query.upcase})
+ end
+
+ return { :source => "Geocoder.CA", :url => "http://geocoder.ca/", :results => results }
+ rescue Exception => ex
+ return { :source => "Geocoder.CA", :url => "http://geocoder.ca/", :error => "Error contacting geocoder.ca: #{ex.to_s}" }
+ end
+
+ def search_osm_namefinder(query)
+ results = Array.new
+
+ # ask OSM namefinder
+ response = fetch_xml("http://gazetteer.openstreetmap.org/namefinder/search.xml?find=#{escape_query(query)}")
+
+ # parse the response
+ response.elements.each("searchresults/named") do |named|
+ lat = named.attributes["lat"].to_s
+ lon = named.attributes["lon"].to_s
+ zoom = named.attributes["zoom"].to_s
+ place = named.elements["place/named"] || named.elements["nearestplaces/named"]
+ type = named.attributes["info"].to_s.capitalize
+ name = named.attributes["name"].to_s
+ description = named.elements["description"].to_s
+
+ if name.empty?
+ prefix = ""
+ name = type
+ else
+ prefix = "#{type} "
+ end
+
+ if place
+ distance = format_distance(place.attributes["approxdistance"].to_i)
+ direction = format_direction(place.attributes["direction"].to_i)
+ placename = format_name(place.attributes["name"].to_s)
+ suffix = ", #{distance} #{direction} of #{placename}"
+
+ if place.attributes["rank"].to_i <= 30
+ parent = nil
+ parentrank = 0
+ parentscore = 0
+
+ place.elements.each("nearestplaces/named") do |nearest|
+ nearestrank = nearest.attributes["rank"].to_i
+ nearestscore = nearestrank / nearest.attributes["distance"].to_f
+
+ if nearestrank > 30 and
+ ( nearestscore > parentscore or
+ ( nearestscore == parentscore and nearestrank > parentrank ) )
+ parent = nearest
+ parentrank = nearestrank
+ parentscore = nearestscore
+ end
+ end
+
+ if parent
+ parentname = format_name(parent.attributes["name"].to_s)
+
+ if place.attributes["info"].to_s == "suburb"
+ suffix = "#{suffix}, #{parentname}"
+ else
+ parentdistance = format_distance(parent.attributes["approxdistance"].to_i)
+ parentdirection = format_direction(parent.attributes["direction"].to_i)
+ suffix = "#{suffix} (#{parentdistance} #{parentdirection} of #{parentname})"
+ end
+ end
end
+ else
+ suffix = ""
end
- redirect_to :controller => 'geocoder', :action => 'results', :params => @res_ary
+
+ results.push({:lat => lat, :lon => lon, :zoom => zoom,
+ :prefix => prefix, :name => name, :suffix => suffix,
+ :description => description})
+ end
+
+ return { :source => "OpenStreetMap Namefinder", :url => "http://gazetteer.openstreetmap.org/namefinder/", :results => results }
+ rescue Exception => ex
+ return { :source => "OpenStreetMap Namefinder", :url => "http://gazetteer.openstreetmap.org/namefinder/", :error => "Error contacting gazetteer.openstreetmap.org: #{ex.to_s}" }
+ end
+
+ def search_geonames(query)
+ results = Array.new
+
+ # ask geonames.org
+ response = fetch_xml("http://ws.geonames.org/search?q=#{escape_query(query)}&maxRows=20")
+
+ # parse the response
+ response.elements.each("geonames/geoname") do |geoname|
+ lat = geoname.get_text("lat").to_s
+ lon = geoname.get_text("lng").to_s
+ name = geoname.get_text("name").to_s
+ country = geoname.get_text("countryName").to_s
+ results.push({:lat => lat, :lon => lon, :zoom => GEONAMES_ZOOM,
+ :name => name,
+ :suffix => ", #{country}"})
+ end
+
+ return { :source => "GeoNames", :url => "http://www.geonames.org/", :results => results }
+ rescue Exception => ex
+ return { :source => "GeoNames", :url => "http://www.geonames.org/", :error => "Error contacting ws.geonames.org: #{ex.to_s}" }
+ end
+
+ def description_osm_namefinder(types, lat, lon, max)
+ results = Array.new
+
+ # ask OSM namefinder
+ response = fetch_xml("http://gazetteer.openstreetmap.org/namefinder/search.xml?find=#{types}+near+#{lat},#{lon}&max=#{max}")
+
+ # parse the response
+ response.elements.each("searchresults/named") do |named|
+ lat = named.attributes["lat"].to_s
+ lon = named.attributes["lon"].to_s
+ zoom = named.attributes["zoom"].to_s
+ place = named.elements["place/named"] || named.elements["nearestplaces/named"]
+ type = named.attributes["info"].to_s
+ name = named.attributes["name"].to_s
+ description = named.elements["description"].to_s
+ distance = format_distance(place.attributes["approxdistance"].to_i)
+ direction = format_direction((place.attributes["direction"].to_i - 180) % 360)
+ prefix = "#{distance} #{direction} of #{type} "
+ results.push({:lat => lat, :lon => lon, :zoom => zoom,
+ :prefix => prefix.capitalize, :name => name,
+ :description => description})
+ end
+
+ return { :type => types.capitalize, :source => "OpenStreetMap Namefinder", :url => "http://gazetteer.openstreetmap.org/namefinder/", :results => results }
+ rescue Exception => ex
+ return { :type => types.capitalize, :source => "OpenStreetMap Namefinder", :url => "http://gazetteer.openstreetmap.org/namefinder/", :error => "Error contacting gazetteer.openstreetmap.org: #{ex.to_s}" }
+ end
+
+ def description_geonames(lat, lon)
+ results = Array.new
+
+ # ask geonames.org
+ response = fetch_xml("http://ws.geonames.org/countrySubdivision?lat=#{lat}&lng=#{lon}")
+
+ # parse the response
+ response.elements.each("geonames/countrySubdivision") do |geoname|
+ name = geoname.get_text("adminName1").to_s
+ country = geoname.get_text("countryName").to_s
+ results.push({:prefix => "#{name}, #{country}"})
end
+
+ return { :type => "Location", :source => "GeoNames", :url => "http://www.geonames.org/", :results => results }
+ rescue Exception => ex
+ return { :type => "Location", :source => "GeoNames", :url => "http://www.geonames.org/", :error => "Error contacting ws.geonames.org: #{ex.to_s}" }
+ end
+
+ def fetch_text(url)
+ return Net::HTTP.get(URI.parse(url))
+ end
+
+ def fetch_xml(url)
+ return REXML::Document.new(fetch_text(url))
+ end
+
+ def format_distance(distance)
+ return "less than 1km" if distance == 0
+ return "about #{distance}km"
+ end
+
+ def format_direction(bearing)
+ return "south-west" if bearing >= 22.5 and bearing < 67.5
+ return "south" if bearing >= 67.5 and bearing < 112.5
+ return "south-east" if bearing >= 112.5 and bearing < 157.5
+ return "east" if bearing >= 157.5 and bearing < 202.5
+ return "north-east" if bearing >= 202.5 and bearing < 247.5
+ return "north" if bearing >= 247.5 and bearing < 292.5
+ return "north-west" if bearing >= 292.5 and bearing < 337.5
+ return "west"
+ end
+
+ def format_name(name)
+ return name.gsub(/( *\[[^\]]*\])*$/, "")
+ end
+
+ def count_results(results)
+ count = 0
+
+ results.each do |source|
+ count += source[:results].length if source[:results]
+ end
+
+ return count
end
- def result
- @res = :params[@res_ary]
+ def escape_query(query)
+ return URI.escape(query, Regexp.new("[^#{URI::PATTERN::UNRESERVED}]", false, 'N'))
end
end
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