252 lines
8.4 KiB
Ruby
252 lines
8.4 KiB
Ruby
class GeocoderController < ApplicationController
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require "cgi"
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require "uri"
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require "rexml/document"
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before_action :authorize_web
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before_action :set_locale
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before_action :require_oauth, :only => [:search]
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authorize_resource :class => false
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def search
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@params = normalize_params
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@sources = []
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if @params[:lat] && @params[:lon]
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@sources.push(:name => "latlon", :url => root_path)
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@sources.push(:name => "osm_nominatim_reverse", :url => nominatim_reverse_url(:format => "html"))
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elsif @params[:query]
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@sources.push(:name => "osm_nominatim", :url => nominatim_url(:format => "html"))
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end
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if @sources.empty?
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head :bad_request
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else
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render :layout => map_layout
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end
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end
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def search_latlon
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lat = params[:lat].to_f
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lon = params[:lon].to_f
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if params[:latlon_digits]
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# We've got two nondescript numbers for a query, which can mean both "lat, lon" or "lon, lat".
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@results = []
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if lat >= -90 && lat <= 90 && lon >= -180 && lon <= 180
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@results.push(:lat => params[:lat], :lon => params[:lon],
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:zoom => params[:zoom],
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:name => "#{params[:lat]}, #{params[:lon]}")
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end
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if lon >= -90 && lon <= 90 && lat >= -180 && lat <= 180
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@results.push(:lat => params[:lon], :lon => params[:lat],
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:zoom => params[:zoom],
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:name => "#{params[:lon]}, #{params[:lat]}")
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end
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if @results.empty?
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@error = "Latitude or longitude are out of range"
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render :action => "error"
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else
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render :action => "results"
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end
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else
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# Coordinates in a query have come with markers for latitude and longitude.
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if lat < -90 || 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 || 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 = [{ :lat => params[:lat], :lon => params[:lon],
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:zoom => params[:zoom],
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:name => "#{params[:lat]}, #{params[:lon]}" }]
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render :action => "results"
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end
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end
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end
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def search_osm_nominatim
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# ask nominatim
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response = fetch_xml(nominatim_url(:format => "xml"))
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# extract the results from the response
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results = response.elements["searchresults"]
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# create result array
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@results = []
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# create parameter hash for "more results" link
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@more_params = params
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.permit(:query, :minlon, :minlat, :maxlon, :maxlat, :exclude)
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.merge(:exclude => results.attributes["exclude_place_ids"])
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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"]
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lon = place.attributes["lon"]
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klass = place.attributes["class"]
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type = place.attributes["type"]
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name = place.attributes["display_name"]
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min_lat, max_lat, min_lon, max_lon = place.attributes["boundingbox"].split(",")
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prefix_name = if type.empty?
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""
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else
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t "geocoder.search_osm_nominatim.prefix.#{klass}.#{type}", :default => type.tr("_", " ").capitalize
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end
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if klass == "boundary" && type == "administrative"
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rank = (place.attributes["address_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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border_type = nil
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place_type = nil
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place_tags = %w[linked_place place]
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place.elements["extratags"].elements.each("tag") do |extratag|
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border_type = t "geocoder.search_osm_nominatim.border_types.#{extratag.attributes['value']}", :default => border_type if extratag.attributes["key"] == "border_type"
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place_type = t "geocoder.search_osm_nominatim.prefix.place.#{extratag.attributes['value']}", :default => place_type if place_tags.include?(extratag.attributes["key"])
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end
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prefix_name = place_type || border_type || prefix_name
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end
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prefix = t ".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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end
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render :action => "results"
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rescue StandardError => e
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host = URI(Settings.nominatim_url).host
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@error = "Error contacting #{host}: #{e}"
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render :action => "error"
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end
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def search_osm_nominatim_reverse
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# get query parameters
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zoom = params[:zoom]
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# create result array
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@results = []
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# ask nominatim
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response = fetch_xml(nominatim_reverse_url(:format => "xml"))
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# parse the response
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response.elements.each("reversegeocode/result") do |result|
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lat = result.attributes["lat"]
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lon = result.attributes["lon"]
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object_type = result.attributes["osm_type"]
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object_id = result.attributes["osm_id"]
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description = result.text
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@results.push(:lat => lat, :lon => lon,
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:zoom => zoom,
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:name => description,
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:type => object_type, :id => object_id)
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end
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render :action => "results"
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rescue StandardError => e
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host = URI(Settings.nominatim_url).host
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@error = "Error contacting #{host}: #{e}"
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render :action => "error"
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end
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private
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def nominatim_url(format: nil)
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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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viewbox = "&viewbox=#{minlon},#{maxlat},#{maxlon},#{minlat}" if minlon && minlat && maxlon && maxlat
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# get objects to excude
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exclude = "&exclude_place_ids=#{params[:exclude]}" if params[:exclude]
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# build url
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"#{Settings.nominatim_url}search?format=#{format}&extratags=1&q=#{escape_query(query)}#{viewbox}#{exclude}&accept-language=#{http_accept_language.user_preferred_languages.join(',')}"
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end
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def nominatim_reverse_url(format: nil)
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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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# build url
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"#{Settings.nominatim_url}reverse?format=#{format}&lat=#{lat}&lon=#{lon}&zoom=#{zoom}&accept-language=#{http_accept_language.user_preferred_languages.join(',')}"
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end
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def fetch_text(url)
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response = OSM.http_client.get(URI.parse(url))
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if response.success?
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response.body
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else
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raise response.status.to_s
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end
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end
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def fetch_xml(url)
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REXML::Document.new(fetch_text(url))
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end
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def escape_query(query)
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CGI.escape(query)
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end
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def normalize_params
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if query = params[:query]
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query.strip!
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if latlon = query.match(/^(?<ns>[NS])\s*#{dms_regexp('ns')}\W*(?<ew>[EW])\s*#{dms_regexp('ew')}$/) ||
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query.match(/^#{dms_regexp('ns')}\s*(?<ns>[NS])\W*#{dms_regexp('ew')}\s*(?<ew>[EW])$/)
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params.merge!(to_decdeg(latlon.named_captures.compact)).delete(:query)
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elsif latlon = query.match(%r{^(?<lat>[+-]?\d+(?:\.\d+)?)(?:\s+|\s*[,/]\s*)(?<lon>[+-]?\d+(?:\.\d+)?)$})
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params.merge!(:lat => latlon["lat"], :lon => latlon["lon"]).delete(:query)
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params[:latlon_digits] = true
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end
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end
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params.permit(:query, :lat, :lon, :latlon_digits, :zoom, :minlat, :minlon, :maxlat, :maxlon)
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end
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def dms_regexp(name_prefix)
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/
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(?: (?<#{name_prefix}d>\d{1,3}(?:\.\d+)?)°? ) |
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(?: (?<#{name_prefix}d>\d{1,3})°?\s*(?<#{name_prefix}m>\d{1,2}(?:\.\d+)?)['′]? ) |
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(?: (?<#{name_prefix}d>\d{1,3})°?\s*(?<#{name_prefix}m>\d{1,2})['′]?\s*(?<#{name_prefix}s>\d{1,2}(?:\.\d+)?)["″]? )
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/x
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end
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def to_decdeg(captures)
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ns = captures.fetch("ns").casecmp?("s") ? -1 : 1
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nsd = BigDecimal(captures.fetch("nsd", "0"))
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nsm = BigDecimal(captures.fetch("nsm", "0"))
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nss = BigDecimal(captures.fetch("nss", "0"))
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ew = captures.fetch("ew").casecmp?("w") ? -1 : 1
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ewd = BigDecimal(captures.fetch("ewd", "0"))
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ewm = BigDecimal(captures.fetch("ewm", "0"))
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ews = BigDecimal(captures.fetch("ews", "0"))
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lat = ns * (nsd + (nsm / 60) + (nss / 3600))
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lon = ew * (ewd + (ewm / 60) + (ews / 3600))
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{ :lat => lat.round(6).to_s("F"), :lon => lon.round(6).to_s("F") }
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end
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end
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