app/controllers/geocoder_controller.rb

   1 class GeocoderController < ApplicationController
   2   layout 'site'
   3
   4   require 'net/http'
   5   require 'rexml/document'
   6
   7   def search
   8     @postcode_arr = []
   9
  10     unless params[:query][:postcode].empty?
  11       postcode = params[:query][:postcode].upcase
  12       escaped_postcode = postcode.sub(/\s/,'%20')
  13
  14       if postcode.match(/(^\d{5}$)|(^\d{5}-\d{4}$)/)
  15         # Its a zip code - ask geocoder.us
  16         # (They have a non commerical use api)
  17         Net::HTTP.start('rpc.geocoder.us') do |http|
  18           resp = http.get("/service/csv?zip=#{postcode}")
  19           if resp.body.match(/couldn't find this zip/)
  20             redirect_to "/index.html?error=invalid_zip_code"
  21             return
  22           end
  23           data = resp.body.split(/, /) # lat,long,town,state,zip
  24           lat = data[0]
  25           lon = data[1]
  26           redirect_to "/index.html?mlat=#{lat}&mlon=#{lon}&zoom=14"
  27           return
  28         end
  29       elsif postcode.match(/^([A-Z]{1,2}\d+[A-Z]?\s*\d[A-Z]{2})/)
  30         # It matched our naive UK postcode regexp
  31         # Ask npemap to do a combined npemap + freethepostcode search
  32         Net::HTTP.start('www.npemap.org.uk') do |http|
  33           resp = http.get("/cgi/geocoder.fcgi?format=text&postcode=#{escaped_postcode}")
  34           dataline = resp.body.split(/\n/)[1]
  35           data = dataline.split(/,/) # easting,northing,postcode,lat,long
  36           lat = data[3]
  37           lon = data[4]
  38           redirect_to "/index.html?mlat=#{lat}&mlon=#{lon}&zoom=14"
  39           return
  40         end
  41       elsif postcode.match(/^[A-Z]\d[A-Z]\s*\d[A-Z]\d/)
  42         # It's a canadian postcode
  43         # Ask geocoder.ca (note - they have a per-day limit)
  44         postcode = postcode.sub(/\s/,'')
  45         Net::HTTP.start('geocoder.ca') do |http|
  46           resp = http.get("?geoit=XML&postal=#{postcode}")
  47           data_lat = resp.body.slice(/latt>.*?</)
  48           data_lon = resp.body.slice(/longt>.*?</)
  49           lat = data_lat.split(/[<>]/)[1]
  50           lon = data_lon.split(/[<>]/)[1]
  51           redirect_to "/index.html?mlat=#{lat}&mlon=#{lon}&zoom=14"
  52           return
  53         end
  54       elsif postcode.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]) [0-9][ABD-HJLNP-UW-Z]{2})
  55         /)
  56         #its a UK postcode
  57         begin
  58           Net::HTTP.start('www.freethepostcode.org') do |http|
  59             resp = http.get("/geocode?postcode=#{postcode}")
  60             lat = resp.body.scan(/[4-6][0-9]\.?[0-9]+/)
  61             lon = resp.body.scan(/[-+][0-9]\.?[0-9]+/)
  62             redirect_to "/index.html?mlat=#{lat}&mlon=#{lon}&zoom=14"
  63             return
  64           end
  65         rescue
  66           redirect_to "/index.html"
  67           #redirect to somewhere else
  68         end
  69         redirect_to "/index.html?mlat=#{lat}&mlon=#{lon}&zoom=14"
  70         #redirect_to "/index.html?error=unknown_postcode_or_zip"
  71       elsif
  72         # Some other postcode / zip code
  73         # Throw it at geonames, and see if they have any luck with it
  74         Net::HTTP.start('ws.geonames.org') do |http|
  75           resp = http.get("/postalCodeSearch?postalcode=#{escaped_postcode}&maxRows=1")
  76           hits = resp.body.slice(/totalResultsCount>.*?</).split(/[<>]/)[1]
  77           if hits == "0"
  78             # Geonames doesn't know, it's probably wrong
  79             redirect_to "/index.html?error=unknown_postcode_or_zip"
  80             return
  81           end
  82           data_lat = resp.body.slice(/lat>.*?</)
  83           data_lon = resp.body.slice(/lng>.*?</)
  84           lat = data_lat.split(/[<>]/)[1]
  85           lon = data_lon.split(/[<>]/)[1]
  86           redirect_to "/index.html?mlat=#{lat}&mlon=#{lon}&zoom=14"
  87         end
  88       else
  89         # Some other postcode / zip file
  90         redirect_to "/index.html?error=unknown_postcode_or_zip"
  91         return
  92       end
  93     end
  94
  95     if params[:query][:place_name]
  96       @place_name = params[:query][:place_name]
  97       redirect_to :controller => 'geocoder', :action => 'results', :params => {:place_name => @place_name}
  98     end
  99   end
 100
 101   def results
 102     @place_name = params[:place_name]
 103     res_hash = {}
 104     @res_ary = []
 105     begin
 106       Net::HTTP.start('ws.geonames.org') do |http|
 107         res = http.get("/search?q=#{@place_name}&maxRows=10")
 108         xml = REXML::Document.new(res.body)
 109         xml.elements.each("geonames/geoname") do |ele|
 110           res_hash = {}
 111           ele.elements.each("name"){ |n| res_hash['name'] = n.text }
 112           ele.elements.each("countryCode"){ |n| res_hash['countrycode'] = n.text }
 113           ele.elements.each("countryName"){ |n| res_hash['countryname'] = n.text }
 114           ele.elements.each("lat"){ |n| res_hash['lat'] = n.text }
 115           ele.elements.each("lng"){ |n| res_hash['lon']= n.text }
 116           @res_ary << res_hash
 117         end
 118       end
 119     rescue
 120       #Flash a notice to say that geonames is broken
 121       redirect_to "/index.html"
 122     end
 123   end
 124 end