gistfile1.rb

require 'rubygems'
require 'open-uri'
require 'sinatra'
require 'json'
require 'digest/sha1'

configure do
  set :developer_key, ENV['LAYAR_DEVELOPER_KEY'] || ""
  set :user_agent, ENV['USER_AGENT'] || "Layar (hsbchk) / 1.0"
end

get "/hsbc" do
  layerName = "hsbc"
  locale = "zh"
  base = "http://www.hsbc.com.hk/1/PA_1_1_1RD/ABSLFCServlet"
  userId = params[:userId]
  developerId = params[:developerId]
  lat = params[:lat].to_f
  lng = params[:lon].to_f
  radius = (params[:radius] || "2500").to_f
  puts "user: #{userId}, pos: #{lat},#{lng}"

  if !validate_hash(params[:timestamp], params[:developerHash])
    halt 403, "no permission"
  end

  begin
    data = open("#{base}?event=cmd_ajax&location_type=show-all-results&address=&cLat=#{lat}&cLng=#{lng}&LOCALE=#{locale}&rand=#{rand()}",
      "User-Agent" => options.user_agent,
      "Referer" => "http://www.hsbc.com.hk/1/2/hk/branchnetwork").read
    results = JSON.parse(data)["results"]
    hotspots = adapt_hsbc(results).select(){|r| r[:distance] <= radius}
    result = {:nextPageKey => "#{lat},#{lng}", :morePages => false, :layer => layerName, 
        :errorCode => 0, :errorString => "ok", :hotspots => hotspots}
    result.to_json
  rescue StandardError => e # simplistic error handling
    result = {:nextPageKey => "#{lat},#{lng}", :morePages => false, :layer => layerName, 
      :errorCode => 1, :errorString => "Unexpected Error: #{e.message}", :hotspots => []}
    halt 500, result.to_json
  end
end

helpers do
  def adapt_hsbc(results)
    results.collect do |r|
      name = r["location"]["name"]
      facilities = r["location"]["facilities"].join(" / ") rescue ""
      locationId = r["location"]["locationId"]
      contacts = r["location"]["contacts"].join(", ") rescue ""
      address = r["location"]["address"]["postalAddress"]
      lng = r["location"]["address"]["lng"].to_f
      lat = r["location"]["address"]["lat"].to_f
      dist = r["location"]["distance"].to_f
      {
         :actions => [], 
         :distance => dist * 1000,
         :attribution => "data from www.hsbc.com.hk",
         :id => "#{locationId}",
         :imageURL => nil,
         :lat => (lat * 1000000).to_i,
         :lon => (lng * 1000000).to_i,
         :title => name,
         :line2 => address,
         :line3 => contacts,
         :line4 => facilities,
         :type => 0
      }
    end
  end
  
  def validate_hash(timestamp, developerHash)
    developerHashCorrect = Digest::SHA1.hexdigest(options.developer_key + timestamp)
    return developerHash == developerHashCorrect
  end
end