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[rails.git] / lib / nominatim.rb
1 module Nominatim
2   extend ActionView::Helpers::NumberHelper
3
4   def self.describe_location(lat, lon, zoom = nil, language = nil)
5     zoom = zoom || 14
6     language = language || http_accept_language.user_preferred_languages.join(',')
7
8     Rails.cache.fetch "/nominatim/location/#{lat}/#{lon}/#{zoom}/#{language}" do
9       url = "http://nominatim.openstreetmap.org/reverse?lat=#{lat}&lon=#{lon}&zoom=#{zoom}&accept-language=#{language}"
10
11       begin
12         response = OSM::Timer.timeout(4) do
13           REXML::Document.new(Net::HTTP.get(URI.parse(url)))
14         end
15       rescue Exception
16         response = nil
17       end
18
19       if response and result = response.get_text("reversegeocode/result")
20         result.to_s
21       else
22         "#{number_with_precision(lat, :precision => 3)}, #{number_with_precision(lon, :precision => 3)}"
23       end
24     end
25   end
26 end