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