384 lines
13 KiB
Ruby
384 lines
13 KiB
Ruby
# coding: utf-8
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class GeocoderController < ApplicationController
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require 'uri'
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require 'net/http'
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require 'rexml/document'
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before_filter :authorize_web
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before_filter :set_locale
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before_filter :convert_latlon, :only => [:search]
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def search
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@query = params[:query]
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@sources = Array.new
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@query.sub(/^\s+/, "")
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@query.sub(/\s+$/, "")
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if @query.match(/^[+-]?\d+(\.\d*)?\s*[\s,]\s*[+-]?\d+(\.\d*)?$/)
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@sources.push "latlon"
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elsif @query.match(/^\d{5}(-\d{4})?$/)
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@sources.push "us_postcode"
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@sources.push "osm_nominatim"
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elsif @query.match(/^(GIR 0AA|[A-PR-UWYZ]([0-9]{1,2}|([A-HK-Y][0-9]|[A-HK-Y][0-9]([0-9]|[ABEHMNPRV-Y]))|[0-9][A-HJKS-UW])\s*[0-9][ABD-HJLNP-UW-Z]{2})$/i)
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@sources.push "uk_postcode"
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@sources.push "osm_nominatim"
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elsif @query.match(/^[A-Z]\d[A-Z]\s*\d[A-Z]\d$/i)
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@sources.push "ca_postcode"
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@sources.push "osm_nominatim"
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else
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@sources.push "osm_nominatim"
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@sources.push "geonames" if defined?(GEONAMES_USERNAME)
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end
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end
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def search_latlon
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# get query parameters
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query = params[:query]
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# create result array
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@results = Array.new
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# decode the location
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if m = query.match(/^\s*([+-]?\d+(\.\d*)?)\s*[\s,]\s*([+-]?\d+(\.\d*)?)\s*$/)
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lat = m[1].to_f
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lon = m[3].to_f
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end
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# generate results
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if lat < -90 or lat > 90
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@error = "Latitude #{lat} out of range"
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render :action => "error"
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elsif lon < -180 or lon > 180
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@error = "Longitude #{lon} out of range"
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render :action => "error"
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else
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@results.push({:lat => lat, :lon => lon,
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:zoom => POSTCODE_ZOOM,
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:name => "#{lat}, #{lon}"})
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render :action => "results"
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end
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end
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def search_us_postcode
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# get query parameters
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query = params[:query]
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# create result array
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@results = Array.new
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# ask geocoder.us (they have a non-commercial use api)
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response = fetch_text("http://rpc.geocoder.us/service/csv?zip=#{escape_query(query)}")
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# parse the response
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unless response.match(/couldn't find this zip/)
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data = response.split(/\s*,\s+/) # lat,long,town,state,zip
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@results.push({:lat => data[0], :lon => data[1],
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:zoom => POSTCODE_ZOOM,
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:prefix => "#{data[2]}, #{data[3]},",
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:name => data[4]})
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end
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render :action => "results"
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rescue Exception => ex
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@error = "Error contacting rpc.geocoder.us: #{ex.to_s}"
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render :action => "error"
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end
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def search_uk_postcode
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# get query parameters
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query = params[:query]
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# create result array
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@results = Array.new
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# ask npemap.org.uk to do a combined npemap + freethepostcode search
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response = fetch_text("http://www.npemap.org.uk/cgi/geocoder.fcgi?format=text&postcode=#{escape_query(query)}")
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# parse the response
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unless response.match(/Error/)
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dataline = response.split(/\n/)[1]
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data = dataline.split(/,/) # easting,northing,postcode,lat,long
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postcode = data[2].gsub(/'/, "")
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zoom = POSTCODE_ZOOM - postcode.count("#")
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@results.push({:lat => data[3], :lon => data[4], :zoom => zoom,
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:name => postcode})
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end
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render :action => "results"
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rescue Exception => ex
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@error = "Error contacting www.npemap.org.uk: #{ex.to_s}"
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render :action => "error"
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end
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def search_ca_postcode
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# get query parameters
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query = params[:query]
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@results = Array.new
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# ask geocoder.ca (note - they have a per-day limit)
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response = fetch_xml("http://geocoder.ca/?geoit=XML&postal=#{escape_query(query)}")
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# parse the response
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if response.get_elements("geodata/error").empty?
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@results.push({:lat => response.get_text("geodata/latt").to_s,
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:lon => response.get_text("geodata/longt").to_s,
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:zoom => POSTCODE_ZOOM,
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:name => query.upcase})
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end
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render :action => "results"
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rescue Exception => ex
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@error = "Error contacting geocoder.ca: #{ex.to_s}"
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render :action => "error"
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end
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def search_osm_nominatim
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# get query parameters
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query = params[:query]
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minlon = params[:minlon]
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minlat = params[:minlat]
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maxlon = params[:maxlon]
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maxlat = params[:maxlat]
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# get view box
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if minlon && minlat && maxlon && maxlat
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viewbox = "&viewbox=#{minlon},#{maxlat},#{maxlon},#{minlat}"
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end
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# get objects to excude
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if params[:exclude]
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exclude = "&exclude_place_ids=#{params[:exclude].join(',')}"
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end
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# ask nominatim
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response = fetch_xml("#{NOMINATIM_URL}search?format=xml&q=#{escape_query(query)}#{viewbox}#{exclude}&accept-language=#{http_accept_language.user_preferred_languages.join(',')}")
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# create result array
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@results = Array.new
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# create parameter hash for "more results" link
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@more_params = params.reverse_merge({ :exclude => [] })
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# extract the results from the response
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results = response.elements["searchresults"]
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# parse the response
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results.elements.each("place") do |place|
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lat = place.attributes["lat"].to_s
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lon = place.attributes["lon"].to_s
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klass = place.attributes["class"].to_s
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type = place.attributes["type"].to_s
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name = place.attributes["display_name"].to_s
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min_lat,max_lat,min_lon,max_lon = place.attributes["boundingbox"].to_s.split(",")
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prefix_name = t "geocoder.search_osm_nominatim.prefix.#{klass}.#{type}", :default => type.gsub("_", " ").capitalize
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if klass == 'boundary' and type == 'administrative'
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rank = (place.attributes["place_rank"].to_i + 1) / 2
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prefix_name = t "geocoder.search_osm_nominatim.admin_levels.level#{rank}", :default => prefix_name
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end
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prefix = t "geocoder.search_osm_nominatim.prefix_format", :name => prefix_name
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object_type = place.attributes["osm_type"]
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object_id = place.attributes["osm_id"]
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@results.push({:lat => lat, :lon => lon,
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:min_lat => min_lat, :max_lat => max_lat,
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:min_lon => min_lon, :max_lon => max_lon,
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:prefix => prefix, :name => name,
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:type => object_type, :id => object_id})
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@more_params[:exclude].push(place.attributes["place_id"].to_s)
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end
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render :action => "results"
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# rescue Exception => ex
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# @error = "Error contacting nominatim.openstreetmap.org: #{ex.to_s}"
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# render :action => "error"
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end
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def search_geonames
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# get query parameters
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query = params[:query]
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# create result array
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@results = Array.new
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# ask geonames.org
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response = fetch_xml("http://api.geonames.org/search?q=#{escape_query(query)}&maxRows=20&username=#{GEONAMES_USERNAME}")
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# parse the response
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response.elements.each("geonames/geoname") do |geoname|
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lat = geoname.get_text("lat").to_s
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lon = geoname.get_text("lng").to_s
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name = geoname.get_text("name").to_s
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country = geoname.get_text("countryName").to_s
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@results.push({:lat => lat, :lon => lon,
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:zoom => GEONAMES_ZOOM,
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:name => name,
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:suffix => ", #{country}"})
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end
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render :action => "results"
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rescue Exception => ex
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@error = "Error contacting ws.geonames.org: #{ex.to_s}"
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render :action => "error"
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end
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def description
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@sources = Array.new
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@sources.push({ :name => "osm_nominatim" })
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@sources.push({ :name => "geonames" })
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end
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def description_osm_nominatim
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# get query parameters
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lat = params[:lat]
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lon = params[:lon]
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zoom = params[:zoom]
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# create result array
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@results = Array.new
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# ask nominatim
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response = fetch_xml("#{NOMINATIM_URL}reverse?lat=#{lat}&lon=#{lon}&zoom=#{zoom}&accept-language=#{http_accept_language.user_preferred_languages.join(',')}")
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# parse the response
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response.elements.each("reversegeocode/result") do |result|
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description = result.get_text.to_s
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@results.push({:prefix => "#{description}"})
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end
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render :action => "results"
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rescue Exception => ex
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@error = "Error contacting nominatim.openstreetmap.org: #{ex.to_s}"
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render :action => "error"
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end
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def description_geonames
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# get query parameters
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lat = params[:lat]
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lon = params[:lon]
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# create result array
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@results = Array.new
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# ask geonames.org
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response = fetch_xml("http://ws.geonames.org/countrySubdivision?lat=#{lat}&lng=#{lon}")
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# parse the response
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response.elements.each("geonames/countrySubdivision") do |geoname|
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name = geoname.get_text("adminName1").to_s
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country = geoname.get_text("countryName").to_s
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@results.push({:prefix => "#{name}, #{country}"})
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end
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render :action => "results"
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rescue Exception => ex
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@error = "Error contacting ws.geonames.org: #{ex.to_s}"
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render :action => "error"
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end
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private
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def fetch_text(url)
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return Net::HTTP.get(URI.parse(url))
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end
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def fetch_xml(url)
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return REXML::Document.new(fetch_text(url))
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end
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def format_distance(distance)
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return t("geocoder.distance", :count => distance)
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end
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def format_direction(bearing)
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return t("geocoder.direction.south_west") if bearing >= 22.5 and bearing < 67.5
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return t("geocoder.direction.south") if bearing >= 67.5 and bearing < 112.5
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return t("geocoder.direction.south_east") if bearing >= 112.5 and bearing < 157.5
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return t("geocoder.direction.east") if bearing >= 157.5 and bearing < 202.5
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return t("geocoder.direction.north_east") if bearing >= 202.5 and bearing < 247.5
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return t("geocoder.direction.north") if bearing >= 247.5 and bearing < 292.5
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return t("geocoder.direction.north_west") if bearing >= 292.5 and bearing < 337.5
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return t("geocoder.direction.west")
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end
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def format_name(name)
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return name.gsub(/( *\[[^\]]*\])*$/, "")
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end
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def count_results(results)
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count = 0
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results.each do |source|
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count += source[:results].length if source[:results]
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end
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return count
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end
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def escape_query(query)
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return URI.escape(query, Regexp.new("[^#{URI::PATTERN::UNRESERVED}]", false, 'N'))
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end
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def convert_latlon
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@query = params[:query]
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if latlon = @query.match(/^([NS])\s*(\d{1,3}(\.\d*)?)\W*([EW])\s*(\d{1,3}(\.\d*)?)$/).try(:captures) # [NSEW] decimal degrees
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params[:query] = nsew_to_decdeg(latlon)
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elsif latlon = @query.match(/^(\d{1,3}(\.\d*)?)\s*([NS])\W*(\d{1,3}(\.\d*)?)\s*([EW])$/).try(:captures) # decimal degrees [NSEW]
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params[:query] = nsew_to_decdeg(latlon)
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elsif latlon = @query.match(/^([NS])\s*(\d{1,3})°?\s*(\d{1,3}(\.\d*)?)?['′]?\W*([EW])\s*(\d{1,3})°?\s*(\d{1,3}(\.\d*)?)?['′]?$/).try(:captures) # [NSEW] degrees, decimal minutes
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params[:query] = ddm_to_decdeg(latlon)
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elsif latlon = @query.match(/^(\d{1,3})°?\s*(\d{1,3}(\.\d*)?)?['′]?\s*([NS])\W*(\d{1,3})°?\s*(\d{1,3}(\.\d*)?)?['′]?\s*([EW])$/).try(:captures) # degrees, decimal minutes [NSEW]
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params[:query] = ddm_to_decdeg(latlon)
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elsif latlon = @query.match(/^([NS])\s*(\d{1,3})°?\s*(\d{1,2})['′]?\s*(\d{1,3}(\.\d*)?)?["″]?\W*([EW])\s*(\d{1,3})°?\s*(\d{1,2})['′]?\s*(\d{1,3}(\.\d*)?)?["″]?$/).try(:captures) # [NSEW] degrees, minutes, decimal seconds
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params[:query] = dms_to_decdeg(latlon)
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elsif latlon = @query.match(/^(\d{1,3})°?\s*(\d{1,2})['′]?\s*(\d{1,3}(\.\d*)?)?["″]\s*([NS])\W*(\d{1,3})°?\s*(\d{1,2})['′]?\s*(\d{1,3}(\.\d*)?)?["″]?\s*([EW])$/).try(:captures) # degrees, minutes, decimal seconds [NSEW]
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params[:query] = dms_to_decdeg(latlon)
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else
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return
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end
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end
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def nsew_to_decdeg(captures)
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begin
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Float(captures[0])
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captures[2].downcase != 's' ? lat = captures[0].to_f : lat = -(captures[0].to_f)
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captures[5].downcase != 'w' ? lon = captures[3].to_f : lon = -(captures[3].to_f)
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rescue
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captures[0].downcase != 's' ? lat = captures[1].to_f : lat = -(captures[1].to_f)
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captures[3].downcase != 'w' ? lon = captures[4].to_f : lon = -(captures[4].to_f)
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end
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return "#{lat}, #{lon}"
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end
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def ddm_to_decdeg(captures)
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begin
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Float(captures[0])
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captures[3].downcase != 's' ? lat = captures[0].to_f + captures[1].to_f/60 : lat = -(captures[0].to_f + captures[1].to_f/60)
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captures[7].downcase != 'w' ? lon = captures[4].to_f + captures[5].to_f/60 : lon = -(captures[4].to_f + captures[5].to_f/60)
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rescue
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captures[0].downcase != 's' ? lat = captures[1].to_f + captures[2].to_f/60 : lat = -(captures[1].to_f + captures[2].to_f/60)
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captures[4].downcase != 'w' ? lon = captures[5].to_f + captures[6].to_f/60 : lon = -(captures[5].to_f + captures[6].to_f/60)
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end
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return "#{lat}, #{lon}"
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end
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def dms_to_decdeg(captures)
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begin
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Float(captures[0])
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captures[4].downcase != 's' ? lat = captures[0].to_f + (captures[1].to_f + captures[2].to_f/60)/60 : lat = -(captures[0].to_f + (captures[1].to_f + captures[2].to_f/60)/60)
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captures[9].downcase != 'w' ? lon = captures[5].to_f + (captures[6].to_f + captures[7].to_f/60)/60 : lon = -(captures[5].to_f + (captures[6].to_f + captures[7].to_f/60)/60)
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rescue
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captures[0].downcase != 's' ? lat = captures[1].to_f + (captures[2].to_f + captures[3].to_f/60)/60 : lat = -(captures[1].to_f + (captures[2].to_f + captures[3].to_f/60)/60)
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captures[5].downcase != 'w' ? lon = captures[6].to_f + (captures[7].to_f + captures[8].to_f/60)/60 : lon = -(captures[6].to_f + (captures[7].to_f + captures[8].to_f/60)/60)
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end
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return "#{lat}, #{lon}"
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end
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end
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