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     res_hash = {}
   9     @postcode_arr = []
  10     @res_ary = []
  11
  12     if params[:query][:postcode]
  13       postcode = params[:query][:postcode].upcase
  14       escaped_postcode = postcode.sub(/\s/,'%20')
  15
  16       if postcode.match(/(^\d{5}$)|(^\d{5}-\d{4}$)/)
  17         # Its a zip code - ask geocoder.us
  18         # (They have a non commerical use api)
  19         Net::HTTP.start('rpc.geocoder.us') do |http|
  20           resp = http.get("/service/csv?zip=#{postcode}")
  21           if resp.body.match(/couldn't find this zip/)
  22               redirect_to "/index.html?error=invalid_zip_code"
  23               return
  24           end
  25           data = resp.body.split(/, /) # lat,long,town,state,zip
  26           lat = data[0]
  27           lon = data[1]
  28           redirect_to "/index.html?lat=#{lat}&lon=#{lon}&zoom=14"
  29         end
  30       elsif postcode.match(/^([A-Z]{1,2}\d+[A-Z]?\s*\d[A-Z]{2})/)
  31         # It matched our naive UK postcode regexp
  32         # Ask npemap to do a combined npemap + freethepostcode search
  33         Net::HTTP.start('www.npemap.org.uk') do |http|
  34           resp = http.get("/cgi/geocoder.fcgi?format=text&postcode=#{escaped_postcode}")
  35           dataline = resp.body.split(/\n/)[1]
  36           data = dataline.split(/,/) # easting,northing,postcode,lat,long
  37           lat = data[3]
  38           lon = data[4]
  39           redirect_to "/index.html?lat=#{lat}&lon=#{lon}&zoom=14"
  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?lat=#{lat}&lon=#{lon}&zoom=14"
  52         end
  53       else
  54         # Some other postcode / zip code
  55         # Throw it at geonames, and see if they have any luck with it
  56         Net::HTTP.start('ws.geonames.org') do |http|
  57           resp = http.get("/postalCodeSearch?postalcode=#{escaped_postcode}&maxRows=1")
  58           hits = resp.body.slice(/totalResultsCount>.*?</).split(/[<>]/)[1]
  59           if hits == "0"
  60              # Geonames doesn't know, it's probably wrong
  61              redirect_to "/index.html?error=unknown_postcode_or_zip"
  62              return
  63           end
  64           data_lat = resp.body.slice(/lat>.*?</)
  65           data_lon = resp.body.slice(/lng>.*?</)
  66           lat = data_lat.split(/[<>]/)[1]
  67           lon = data_lon.split(/[<>]/)[1]
  68           redirect_to "/index.html?lat=#{lat}&lon=#{lon}&zoom=14"
  69         end
  70       end
  71     else
  72       if params[:query][:place_name] != nil or ""
  73         place_name = params[:query][:place_name]
  74         Net::HTTP.start('ws.geonames.org') do |http|
  75           res = http.get("/search?q=#{place_name}&maxRows=10")
  76           xml = REXML::Document.new(res.body)
  77           xml.elements.each("geonames/geoname") do |ele|
  78             res_hash = {}
  79             ele.elements.each("name"){ |n| res_hash['name'] = n.text }
  80             ele.elements.each("countryCode"){ |n| res_hash['country_code'] = n.text }
  81             ele.elements.each("countryNode"){ |n| res_hash['country_name'] = n.text }
  82             ele.elements.each("lat"){ |n| res_hash['lat'] = n.text }
  83             ele.elements.each("lng"){ |n| res_hash['lon']= n.text }
  84             @res_ary << res_hash
  85           end
  86         end
  87       end
  88       redirect_to :controller => 'geocoder', :action => 'results', :params => @res_ary
  89     end
  90   end
  91
  92   def result
  93     @res = :params[@res_ary]
  94   end
  95 end