From 6706ca3c5020577c22f69a6590dd6ff4e065c8a4 Mon Sep 17 00:00:00 2001
From: Tom Hughes <tom@compton.nu>
Date: Wed, 8 Aug 2007 12:37:16 +0000
Subject: [PATCH] Use IP GeoLocation to choose a default view for the slippy
 map if we don't have any better ideas.

---
 app/views/site/index.rhtml |  9 +++++++++
 lib/osm.rb                 | 25 ++++++++++++++++++++++++-
 2 files changed, 33 insertions(+), 1 deletion(-)

diff --git a/app/views/site/index.rhtml b/app/views/site/index.rhtml
index dc488089d..5488ba40d 100644
--- a/app/views/site/index.rhtml
+++ b/app/views/site/index.rhtml
@@ -33,11 +33,20 @@
 <% lat =  @user.home_lat %>
 <% zoom = '10' %>
 <% else %>
+<% session[:location] = OSM::IPLocation(request.env['REMOTE_ADDR']) unless session[:location] %>
+<% if session[:location] %>
+<% bbox = true %>
+<% minlon = session[:location][:minlon] %>
+<% minlat = session[:location][:minlat] %>
+<% maxlon = session[:location][:maxlon] %>
+<% maxlat = session[:location][:maxlat] %>
+<% else %>
 <% lon =  '-0.1' %>
 <% lat =  '51.5' %>
 <% zoom =  params['zoom'] || '5' %>
 <% layers = params['layers'] %>
 <% end %>
+<% end %>
 
 <script type="text/javascript" src="/openlayers/OpenLayers.js"></script>
 <%= javascript_include_tag 'map.js' %>
diff --git a/lib/osm.rb b/lib/osm.rb
index 77b07ce3d..3d53b453a 100644
--- a/lib/osm.rb
+++ b/lib/osm.rb
@@ -5,7 +5,7 @@ module OSM
   #
   # This would print every latitude value:
   #
-  # gpx = OSM:GPXImporter.new('somefile.gpx')
+  # gpx = OSM::GPXImporter.new('somefile.gpx')
   # gpx.points {|p| puts p['latitude']}
 
   require 'time'
@@ -364,4 +364,27 @@ module OSM
       return doc
     end
   end
+
+  def self.IPLocation(ip_address)
+    Timeout::timeout(4) do
+      Net::HTTP.start('api.hostip.info') do |http|
+        country = http.get("/country.php?ip=#{ip_address}").body
+        country = "GB" if country = "UK"
+        Net::HTTP.start('ws.geonames.org') do |http|
+          xml = REXML::Document.new(http.get("/countryInfo?country=#{country}").body)
+          xml.elements.each("geonames/country") do |ele|
+            minlon = ele.get_text("bBoxWest").to_s
+            minlat = ele.get_text("bBoxSouth").to_s
+            maxlon = ele.get_text("bBoxEast").to_s
+            maxlat = ele.get_text("bBoxNorth").to_s
+            return { :minlon => minlon, :minlat => minlat, :maxlon => maxlon, :maxlat => maxlat }
+          end
+        end
+      end
+    end
+
+    return nil
+  rescue
+    return nil
+  end
 end
-- 
2.39.5