Patching better 412 error messages from mis-commit on old api06 branch.
[rails.git] / app / controllers / geocoder_controller.rb
index 8444311b5ba91e1b2329add807faf81d17189311..18812689b4c2c8318d792993e6366987bdde479a 100644 (file)
 class GeocoderController < ApplicationController
-  layout 'site'
-
+  require 'uri'
   require 'net/http'
   require 'rexml/document'
 
+  POSTCODE_ZOOM = 15
+  GEONAMES_ZOOM = 12
+
   def search
+    query = params[:query]
+    results = Array.new
 
-    if params[:postcode]
-      unless params[:postcode].empty?
-        postcode = params[:postcode]
-        check_postcode(postcode)
-        return
-      end
+    if query.match(/^\d{5}(-\d{4})?$/)
+      results.push search_us_postcode(query)
+    elsif query.match(/(GIR 0AA|[A-PR-UWYZ]([0-9]{1,2}|([A-HK-Y][0-9]|[A-HK-Y][0-9]([0-9]|[ABEHMNPRV-Y]))|[0-9][A-HJKS-UW])\s*[0-9][ABD-HJLNP-UW-Z]{2})/i)
+      results.push search_uk_postcode(query)
+      results.push search_osm_namefinder(query)
+    elsif query.match(/[A-Z]\d[A-Z]\s*\d[A-Z]\d/i)
+      results.push search_ca_postcode(query)
+    else
+      results.push search_osm_namefinder(query)
+      results.push search_geonames(query)
     end
-    if params[:query][:postcode]
-      unless params[:query][:postcode].empty?
-        postcode =params[:query][:postcode]
-        check_postcode(postcode)
-        return
+
+    results_count = count_results(results)
+
+    render :update do |page|
+      page.replace_html :sidebar_content, :partial => 'results', :object => results
+
+      if results_count == 1
+        position = results.collect { |s| s[:results] }.compact.flatten[0]
+        page.call "setPosition", position[:lat].to_f, position[:lon].to_f, position[:zoom].to_i
+      else
+        page.call "openSidebar"
       end
     end
-    if params[:query][:place_name]  
-      @place_name = params[:query][:place_name]
-      redirect_to :controller => 'geocoder', :action => 'results', :params => {:place_name => @place_name}
-    end 
-  end
-
-  def check_postcode(p)
-
-    @postcode_arr = []
-    postcode = p.upcase
-    escaped_postcode = postcode.sub(/\s/,'%20')
-
-    begin
-      if postcode.match(/(^\d{5}$)|(^\d{5}-\d{4}$)/)
-        # Its a zip code - ask geocoder.us
-        # (They have a non commerical use api)
-        Net::HTTP.start('rpc.geocoder.us') do |http|
-          resp = http.get("/service/csv?zip=#{postcode}")
-          if resp.body.match(/couldn't find this zip/)
-            redirect_to :controller => params[:next_controller], :action => params[:next_action], :error => "invalid_zip_code"
-            return
-          end
-          data = resp.body.split(/, /) # lat,long,town,state,zip
-          lat = data[0] 
-          lon = data[1]
-          redirect_to :controller => params[:next_controller], :action => params[:next_action], :mlat => lat, :mlon => lon, :zoom => 14
-          return
-        end
-      elsif postcode.match(/^([A-Z]{1,2}\d+[A-Z]?\s*\d[A-Z]{2})/)
-        # It matched our naive UK postcode regexp
-        # Ask npemap to do a combined npemap + freethepostcode search
-        Net::HTTP.start('www.npemap.org.uk') do |http|
-          resp = http.get("/cgi/geocoder.fcgi?format=text&postcode=#{escaped_postcode}")
-          dataline = resp.body.split(/\n/)[1]
-          data = dataline.split(/,/) # easting,northing,postcode,lat,long
-          lat = data[3] 
-          lon = data[4]
-          redirect_to :controller => params[:next_controller], :action => params[:next_action], :mlat => lat, :mlon => lon, :zoom => 14
-          return
-        end
-      elsif postcode.match(/^[A-Z]\d[A-Z]\s*\d[A-Z]\d/)
-        # It's a canadian postcode
-        # Ask geocoder.ca (note - they have a per-day limit)
-        postcode = postcode.sub(/\s/,'')
-        Net::HTTP.start('geocoder.ca') do |http|
-          resp = http.get("?geoit=XML&postal=#{postcode}")
-          data_lat = resp.body.slice(/latt>.*?</)
-          data_lon = resp.body.slice(/longt>.*?</)
-          lat = data_lat.split(/[<>]/)[1]
-          lon = data_lon.split(/[<>]/)[1]
-          redirect_to :controller => params[:next_controller], :action => params[:next_action], :mlat => lat, :mlon => lon, :zoom => 14
-          return
-        end
-      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})
-        /)
-        #its a UK postcode
-        begin
-          Net::HTTP.start('www.freethepostcode.org') do |http|
-            resp = http.get("/geocode?postcode=#{postcode}")
-            lat = resp.body.scan(/[4-6][0-9]\.?[0-9]+/)
-            lon = resp.body.scan(/[-+][0-9]\.?[0-9]+/)
-            redirect_to :controller => params[:next_controller], :action => params[:next_action], :mlat => lat, :mlon => lon, :zoom => 14
-            return
+  end
+  
+  def description
+    results = Array.new
+
+    lat = params[:lat]
+    lon = params[:lon]
+
+    results.push description_osm_namefinder("cities", lat, lon, 2)
+    results.push description_osm_namefinder("towns", lat, lon, 4)
+    results.push description_osm_namefinder("places", lat, lon, 10)
+    results.push description_geonames(lat, lon)
+
+    render :update do |page|
+      page.replace_html :sidebar_content, :partial => 'results', :object => results
+      page.call "openSidebar"
+    end
+  end
+
+private
+
+  def search_us_postcode(query)
+    results = Array.new
+
+    # ask geocoder.us (they have a non-commercial use api)
+    response = fetch_text("http://rpc.geocoder.us/service/csv?zip=#{escape_query(query)}")
+
+    # parse the response
+    unless response.match(/couldn't find this zip/)
+      data = response.split(/\s*,\s+/) # lat,long,town,state,zip
+      results.push({:lat => data[0], :lon => data[1], :zoom => POSTCODE_ZOOM,
+                    :prefix => "#{data[2]}, #{data[3]}, ",
+                    :name => data[4]})
+    end
+
+    return { :source => "Geocoder.us", :url => "http://geocoder.us/", :results => results }
+  rescue Exception => ex
+    return { :source => "Geocoder.us", :url => "http://geocoder.us/", :error => "Error contacting rpc.geocoder.us: #{ex.to_s}" }
+  end
+
+  def search_uk_postcode(query)
+    results = Array.new
+
+    # ask npemap.org.uk to do a combined npemap + freethepostcode search
+    response = fetch_text("http://www.npemap.org.uk/cgi/geocoder.fcgi?format=text&postcode=#{escape_query(query)}")
+
+    # parse the response
+    unless response.match(/Error/)
+      dataline = response.split(/\n/)[1]
+      data = dataline.split(/,/) # easting,northing,postcode,lat,long
+      postcode = data[2].gsub(/'/, "")
+      zoom = POSTCODE_ZOOM - postcode.count("#")
+      results.push({:lat => data[3], :lon => data[4], :zoom => zoom,
+                    :name => postcode})
+    end
+
+    return { :source => "NPEMap / FreeThePostcode", :url => "http://www.npemap.org.uk/", :results => results }
+  rescue Exception => ex
+    return { :source => "NPEMap / FreeThePostcode", :url => "http://www.npemap.org.uk/", :error => "Error contacting www.npemap.org.uk: #{ex.to_s}" }
+  end
+
+  def search_ca_postcode(query)
+    results = Array.new
+
+    # ask geocoder.ca (note - they have a per-day limit)
+    response = fetch_xml("http://geocoder.ca/?geoit=XML&postal=#{escape_query(query)}")
+
+    # parse the response
+    if response.get_elements("geodata/error").empty?
+      results.push({:lat => response.get_text("geodata/latt").to_s,
+                    :lon => response.get_text("geodata/longt").to_s,
+                    :zoom => POSTCODE_ZOOM,
+                    :name => query.upcase})
+    end
+
+    return { :source => "Geocoder.CA", :url => "http://geocoder.ca/", :results => results }
+  rescue Exception => ex
+    return { :source => "Geocoder.CA", :url => "http://geocoder.ca/", :error => "Error contacting geocoder.ca: #{ex.to_s}" }
+  end
+
+  def search_osm_namefinder(query)
+    results = Array.new
+
+    # ask OSM namefinder
+    response = fetch_xml("http://gazetteer.openstreetmap.org/namefinder/search.xml?find=#{escape_query(query)}")
+
+    # parse the response
+    response.elements.each("searchresults/named") do |named|
+      lat = named.attributes["lat"].to_s
+      lon = named.attributes["lon"].to_s
+      zoom = named.attributes["zoom"].to_s
+      place = named.elements["place/named"] || named.elements["nearestplaces/named"]
+      type = named.attributes["info"].to_s.capitalize
+      name = named.attributes["name"].to_s
+      description = named.elements["description"].to_s
+
+      if name.empty?
+        prefix = ""
+        name = type
+      else
+        prefix = "#{type} "
+      end
+
+      if place
+        distance = format_distance(place.attributes["approxdistance"].to_i)
+        direction = format_direction(place.attributes["direction"].to_i)
+        placename = format_name(place.attributes["name"].to_s)
+        suffix = ", #{distance} #{direction} of #{placename}"
+
+        if place.attributes["rank"].to_i <= 30
+          parent = nil
+          parentrank = 0
+          parentscore = 0
+
+          place.elements.each("nearestplaces/named") do |nearest|
+            nearestrank = nearest.attributes["rank"].to_i
+            nearestscore = nearestrank / nearest.attributes["distance"].to_f
+
+            if nearestrank > 30 and
+               ( nearestscore > parentscore or
+                 ( nearestscore == parentscore and nearestrank > parentrank ) )
+              parent = nearest
+              parentrank = nearestrank
+              parentscore = nearestscore
+            end
           end
-        rescue
-          redirect_to :controller => params[:next_controller], :action => params[:next_action], :error => "invalid_postcode"
-          #redirect to somewhere else
-        end
-      elsif
-        # Some other postcode / zip code
-        # Throw it at geonames, and see if they have any luck with it
-        Net::HTTP.start('ws.geonames.org') do |http|
-          resp = http.get("/postalCodeSearch?postalcode=#{escaped_postcode}&maxRows=1")
-          hits = resp.body.slice(/totalResultsCount>.*?</).split(/[<>]/)[1]
-          if hits == "0"
-            # Geonames doesn't know, it's probably wrong
-            redirect_to :controller => params[:next_controller], :action => params[:next_action], :error => "invalid_postcode_or_zip"
-            return
+
+          if parent
+            parentname = format_name(parent.attributes["name"].to_s)
+
+            if  place.attributes["info"].to_s == "suburb"
+              suffix = "#{suffix}, #{parentname}"
+            else
+              parentdistance = format_distance(parent.attributes["approxdistance"].to_i)
+              parentdirection = format_direction(parent.attributes["direction"].to_i)
+              suffix = "#{suffix} (#{parentdistance} #{parentdirection} of #{parentname})"
+            end
           end
-          data_lat = resp.body.slice(/lat>.*?</)
-          data_lon = resp.body.slice(/lng>.*?</)
-          lat = data_lat.split(/[<>]/)[1]
-          lon = data_lon.split(/[<>]/)[1]
-          redirect_to :controller => params[:next_controller], :action => params[:next_action], :mlat => lat, :mlon => lon, :zoom => 14
         end
       else
-        # Some other postcode / zip file
-        redirect_to :controller => params[:next_controller], :action => params[:next_action], :error => "invalid_postcode_or_zip"
-        return
+        suffix = ""
       end
-    rescue
-      #Its likely that an api is down
-      redirect_to :controller => params[:next_controller], :action => params[:next_action], :error => "api_down"
+
+      results.push({:lat => lat, :lon => lon, :zoom => zoom,
+                    :prefix => prefix, :name => name, :suffix => suffix,
+                    :description => description})
     end
+
+    return { :source => "OpenStreetMap Namefinder", :url => "http://gazetteer.openstreetmap.org/namefinder/", :results => results }
+  rescue Exception => ex
+    return { :source => "OpenStreetMap Namefinder", :url => "http://gazetteer.openstreetmap.org/namefinder/", :error => "Error contacting gazetteer.openstreetmap.org: #{ex.to_s}" }
   end
 
-  def results
-    @place_name = params[:place_name]
-    res_hash = {}
-    @res_ary = []
-    begin
-      Net::HTTP.start('ws.geonames.org') do |http|
-        res = http.get("/search?q=#{@place_name}&maxRows=10")
-        xml = REXML::Document.new(res.body)
-        xml.elements.each("geonames/geoname") do |ele|
-          res_hash = {}
-          ele.elements.each("name"){ |n| res_hash['name'] = n.text }
-          ele.elements.each("countryCode"){ |n| res_hash['countrycode'] = n.text }
-          ele.elements.each("countryName"){ |n| res_hash['countryname'] = n.text }
-          ele.elements.each("lat"){ |n| res_hash['lat'] = n.text }
-          ele.elements.each("lng"){ |n| res_hash['lon']= n.text }
-          @res_ary << res_hash
-        end 
-      end
-    rescue
-      #Flash a notice to say that geonames is broken
-      redirect_to "/index.html"
+  def search_geonames(query)
+    results = Array.new
+
+    # ask geonames.org
+    response = fetch_xml("http://ws.geonames.org/search?q=#{escape_query(query)}&maxRows=20")
+
+    # parse the response
+    response.elements.each("geonames/geoname") do |geoname|
+      lat = geoname.get_text("lat").to_s
+      lon = geoname.get_text("lng").to_s
+      name = geoname.get_text("name").to_s
+      country = geoname.get_text("countryName").to_s
+      results.push({:lat => lat, :lon => lon, :zoom => GEONAMES_ZOOM,
+                    :name => name,
+                    :suffix => ", #{country}"})
+    end
+
+    return { :source => "GeoNames", :url => "http://www.geonames.org/", :results => results }
+  rescue Exception => ex
+    return { :source => "GeoNames", :url => "http://www.geonames.org/", :error => "Error contacting ws.geonames.org: #{ex.to_s}" }
+  end
+
+  def description_osm_namefinder(types, lat, lon, max)
+    results = Array.new
+
+    # ask OSM namefinder
+    response = fetch_xml("http://gazetteer.openstreetmap.org/namefinder/search.xml?find=#{types}+near+#{lat},#{lon}&max=#{max}")
+
+    # parse the response
+    response.elements.each("searchresults/named") do |named|
+      lat = named.attributes["lat"].to_s
+      lon = named.attributes["lon"].to_s
+      zoom = named.attributes["zoom"].to_s
+      place = named.elements["place/named"] || named.elements["nearestplaces/named"]
+      type = named.attributes["info"].to_s
+      name = named.attributes["name"].to_s
+      description = named.elements["description"].to_s
+      distance = format_distance(place.attributes["approxdistance"].to_i)
+      direction = format_direction((place.attributes["direction"].to_i - 180) % 360)
+      prefix = "#{distance} #{direction} of #{type} "
+      results.push({:lat => lat, :lon => lon, :zoom => zoom,
+                    :prefix => prefix.capitalize, :name => name,
+                    :description => description})
+    end
+
+    return { :type => types.capitalize, :source => "OpenStreetMap Namefinder", :url => "http://gazetteer.openstreetmap.org/namefinder/", :results => results }
+  rescue Exception => ex
+    return { :type => types.capitalize, :source => "OpenStreetMap Namefinder", :url => "http://gazetteer.openstreetmap.org/namefinder/", :error => "Error contacting gazetteer.openstreetmap.org: #{ex.to_s}" }
+  end
+
+  def description_geonames(lat, lon)
+    results = Array.new
+
+    # ask geonames.org
+    response = fetch_xml("http://ws.geonames.org/countrySubdivision?lat=#{lat}&lng=#{lon}")
+
+    # parse the response
+    response.elements.each("geonames/countrySubdivision") do |geoname|
+      name = geoname.get_text("adminName1").to_s
+      country = geoname.get_text("countryName").to_s
+      results.push({:prefix => "#{name}, #{country}"})
     end
+
+    return { :type => "Location", :source => "GeoNames", :url => "http://www.geonames.org/", :results => results }
+  rescue Exception => ex
+    return { :type => "Location", :source => "GeoNames", :url => "http://www.geonames.org/", :error => "Error contacting ws.geonames.org: #{ex.to_s}" }
+  end
+
+  def fetch_text(url)
+    return Net::HTTP.get(URI.parse(url))
+  end
+
+  def fetch_xml(url)
+    return REXML::Document.new(fetch_text(url))
+  end
+
+  def format_distance(distance)
+    return "less than 1km" if distance == 0
+    return "about #{distance}km"
+  end
+
+  def format_direction(bearing)
+    return "south-west" if bearing >= 22.5 and bearing < 67.5
+    return "south" if bearing >= 67.5 and bearing < 112.5
+    return "south-east" if bearing >= 112.5 and bearing < 157.5
+    return "east" if bearing >= 157.5 and bearing < 202.5
+    return "north-east" if bearing >= 202.5 and bearing < 247.5
+    return "north" if bearing >= 247.5 and bearing < 292.5
+    return "north-west" if bearing >= 292.5 and bearing < 337.5
+    return "west"
+  end
+
+  def format_name(name)
+    return name.gsub(/( *\[[^\]]*\])*$/, "")
+  end
+
+  def count_results(results)
+    count = 0
+
+    results.each do |source|
+      count += source[:results].length if source[:results]
+    end
+
+    return count
+  end
+
+  def escape_query(query)
+    return URI.escape(query, Regexp.new("[^#{URI::PATTERN::UNRESERVED}]", false, 'N'))
   end
 end