ruby 实现 bing 的 geocode

项目中需要进行geo_code
刚开始用的是geokit的gem, 支持多个api, google和yahoo 但是没有bing的, 客户又要求使用bing的

没办法， 搜, geocoder( https://github.com/alexreisner/geocoder)中支持bing的， 但是从rails3良好支持， rails2 的分支中好像没提到，无奈项目又是rails2.3.8的， 所以我把geo_coder源码中的bing部分抠了下来

注： 先去bing申请api key  www.bingmapsportal.com

require 'net/http'
require 'uri'
require 'rubygems'
require 'json'

class Address

  def geocode(address)
    results(address)
  end

  
  def results(query)
    return [] unless doc = fetch_data(query)
    if doc['statusDescription'] == "OK"
      return doc['resourceSets'].first['estimatedTotal'] > 0 ? doc['resourceSets'].first['resources'] : []
    else
      warn "Bing Geocoding API error: #{doc['statusCode']} (#{doc['statusDescription']})."
      return []
    end
  end

  def query_url(query)
    params = {:key => "API-Key"}
    params[:query] = query

    base_url = "http://dev.virtualearth.net/REST/v1/Locations"
    url_tail = "?"
    base_url + url_tail + hash_to_query(params)
  end

  def hash_to_query(hash)
    require 'cgi' unless defined?(CGI) && defined?(CGI.escape)
    hash.collect{ |p|
      p[1].nil? ? nil : p.map{ |i| CGI.escape i.to_s } * '='
    }.compact.sort * '&'
  end
  
  def fetch_data(query)
    begin
      parse_raw_data fetch_raw_data(query)
    rescue SocketError => err
      raise_error(err) or warn "Geocoding API connection cannot be established."
    rescue TimeoutError => err
      raise_error(err) or warn "Geocoding API not responding fast enough " +
        "(see Geocoder::Configuration.timeout to set limit)."
    end
  end

  ##
  # Fetches a raw search result (JSON string).
  #
  def fetch_raw_data(query)
    timeout(30) do
      url = query_url(query)
      uri = URI.parse(url)
      client = http_client.new(uri.host, uri.port)
      response = client.get(uri.request_uri).body
      response
    end
  end

  ##
  # Parses a raw search result (returns hash or array).
  #
  def parse_raw_data(raw_data)
    if defined?(ActiveSupport::JSON)
      ActiveSupport::JSON.decode(raw_data)
    else
      begin
        JSON.parse(raw_data)
      rescue
        warn "Geocoding API's response was not valid JSON."
      end
    end
  end

  ##
  # Object used to make HTTP requests.
  #
  def http_client
    Net::HTTP
  end
end


address = Address.new
address.geocode("25 Main St, Cooperstown, NY")