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