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# A simple function to return a signed, expiring url for Amazon Cloudfront. 
# As it's relatively difficult to figure out exactly what is required, I've posted my working code here.

# This will require openssl, digest/sha1, base64 and maybe other libraries. 
# In my rails app, all of these are already loaded so I'm not sure of the exact dependencies.

module CloudFront
  def get_signed_expiring_url(path, expires_in, private_key_filename, key_pair_id)

    # AWS works on UTC, so make sure you are not using local time

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# config/application.rb

#...
config.autoload_paths += %W(#{config.root}/app/models/namespaces)
#...

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#spec/models/product_spec.rb

require 'spec_helper'

describe Product do

  before :each do
    @valid_attributes = {name: "Test Product",
                         user: mock_model(User)}
  end

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config.force_ssl = true

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require 'rails/application/route_inspector'

class Journey::Visitors::Formatter
  def visit_SYMBOL node
    key = node.to_sym

    if value = options[key]
      consumed[key] = value
      value # Overritten this line to avoid escaping of characters
    else

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config.force_ssl = true

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var form_data = //.. Serialise a form

// Get token and param from the meta tags
var token = $('meta[name="csrf-token"]').attr('content');
var param = $('meta[name="csrf-param"]').attr('content');

// Create url of "/settings/profile?name=Jeremy+Walker&authenticity_token=askdsalewg303y09sd00dshb0b00ac0dffbafds"
document.location = "/settings/profile?_method=PUT&" + form_data + "&" + token + "=" + param;

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rails generate session_migration
rake db:migrate

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heroku addons:add ssl:endpoint
heroku certs:add my_cerficate.crt site.key

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Security::Application.config.session_store :active_record_store