"Controller" and routes for weather underground inquiry via Sinatra

.rvmrc

rvm use ruby-1.8.7-p302@sinatra

application.rb

require 'sinatra'        # Core Web App Framework
require "sinatra/reloader" if development?  # Restart automatically after development changes
require 'rack-flash'
require 'base64'
require 'open-uri'


APP = { :name => "default_app",
    :database_name => "default_app",
    :hit_counter => 0
}

configure do 
  use Rack::Flash
  set :sessions, true  # DANGER: Sinatra sessions are Cookie based; avoid anything sensitive!!!
  set :domain, ENV['URL'] || "localhost"
  set :appinfo, APP
end

helpers do
  not_found do 
    serve_static_file "404.html"
  end
end

require 'controller'

controller.rb

get '/weather' do 
  redirect '/weather/', 303
end

get '/weather/:zip?' do |zip|
  content =[]
  if !zip.nil?
    apikey="13fa13d445725fb5"
    begin
      f = open("http://api.wunderground.com/api/#{apikey}/animatedradar/q/#{zip}.gif?newmaps=1&timelabel=1&timelabel.y=10&num=5&delay=50")
    rescue 
      content << "<h1>Sorry, Weather Underground Radar for #{zip} appears to be offline"
    else
      img_content = f.read
      base64_encoded_image = Base64.encode64(img_content)
      content << "<h1>Weather Underground Radar for #{zip}</h1>"
      content << "<img src='data:image/gif;base64,#{base64_encoded_image}' alt='Weather Underground Radar'/>"
    ensure 
      f.close if not f.nil?
    end
  else
    content << "<h1>Weather Underground Radar</h1>"
    content << "<p>Please enter a zip code: </p>"
    content << "<form>"
    content << "<input id='zip' type='text' value='' />"
    content << "<input id='go' type='button' value='Go' />"
    content << "</form>"
    content << %{
      <script>
      var load = function() {
        document.getElementById('go').addEventListener("click", function() {
          var zip = document.getElementById('zip').value;
          window.location = "/weather/"+zip;
        });
      };
      document.addEventListener("DOMContentLoaded", load, false);  
      </script>
    }
    content.join
  end
  
end

Gemfile

source 'http://rubygems.org'

gem 'sinatra', '1.1.2'
gem 'rack-flash'

gem 'sinatra-reloader', :group => :development

Gemfile.lock

GEM
  remote: http://rubygems.org/
  specs:
    backports (1.18.2)
    monkey-lib (0.5.4)
      backports
    rack (1.2.1)
    rack-flash (0.1.1)
      rack
    sinatra (1.1.2)
      rack (~> 1.1)
      tilt (~> 1.2)
    sinatra-advanced-routes (0.5.1)
      monkey-lib (~> 0.5.0)
      sinatra (~> 1.0)
      sinatra-sugar (~> 0.5.0)
    sinatra-reloader (0.5.0)
      sinatra (~> 1.0)
      sinatra-advanced-routes (~> 0.5.0)
    sinatra-sugar (0.5.0)
      monkey-lib (~> 0.5.0)
      sinatra (~> 1.0)
    tilt (1.2.2)

PLATFORMS
  ruby

DEPENDENCIES
  rack-flash
  sinatra (= 1.1.2)
  sinatra-reloader