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]
  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           data = resp.body.split(/, /) # lat,long,town,state,zip
  22           lat = data[0]
  23           lon = data[1]
  24           redirect_to "/index.html?lat=#{lat}&lon=#{lon}&zoom=14"
  25         end
  26       elsif postcode.match(/^(\w{1,2}\d+\w?\s*\d\w\w)/)
  27         # It matched our naive UK postcode regexp
  28         # Ask npemap to do a combined npemap + freethepostcode search
  29         Net::HTTP.start('www.npemap.org.uk') do |http|
  30           resp = http.get("/cgi/geocoder.fcgi?format=text&postcode=#{escaped_postcode}")
  31           dataline = resp.body.split(/\n/)[1]
  32           data = dataline.split(/,/) # easting,northing,postcode,lat,long
  33           lat = data[3]
  34           lon = data[4]
  35           redirect_to "/index.html?lat=#{lat}&lon=#{lon}&zoom=14"
  36         end
  37       else
  38         # Some other postcode / zip file
  39         redirect_to "/index.html?error=unknown_postcode_or_zip"
  40       end
  41     else
  42       if params[:query][:place_name] != nil or ""
  43         place_name = params[:query][:place_name]
  44         Net::HTTP.start('ws.geonames.org') do |http|
  45           res = http.get("/search?q=#{place_name}&maxRows=10")
  46           xml = REXML::Document.new(res.body)
  47           xml.elements.each("geonames/geoname") do |ele|
  48             res_hash = {}
  49             ele.elements.each("name"){ |n| res_hash['name'] = n.text }
  50             ele.elements.each("countryCode"){ |n| res_hash['country_code'] = n.text }
  51             ele.elements.each("countryNode"){ |n| res_hash['country_name'] = n.text }
  52             ele.elements.each("lat"){ |n| res_hash['lat'] = n.text }
  53             ele.elements.each("lng"){ |n| res_hash['lon']= n.text }
  54             @res_ary << res_hash
  55           end
  56         end
  57       end
  58       redirect_to :controller => 'geocoder', :action => 'results', :params => @res_ary
  59     end
  60   end
  61
  62   def result
  63     @res = :params[@res_ary]
  64   end
  65 end