static-dynamic-tiles.rb

class TilesController < ApplicationController
  around_filter :up_s3

  def tile_response(map)
    respond_to do |format|
      format.png { 
        send_data map.to_png, :content_type => Mime::Type.lookup_by_extension("png"), :disposition => "inline" 
      }
    end
  end

  def up_s3
    path = Rails.application.routes.recognize_path(request.env['PATH_INFO'])
    path_str = "APPSLUG/#{Rails.env}/#{path[:slug]}/#{path[:v]}/#{path[:x]}/#{path[:y]}/#{path[:z]}.png"
    obj = S3BUCKET.objects["#{path_str}"]
    if obj.exists?
      send_data obj.read, :content_type => Mime::Type.lookup_by_extension("png"), :disposition => "inline"
    else
      obj.write yield.first, :acl => :public_read, :content_type => "image/png"
    end
  end
end