app.rb

require 'presto_api'
require 'json'

helpers do
  def request_headers
    env.inject({}){|acc, (k,v)| acc[$1.downcase] = v if k =~ /^http_(.*)/i; acc}
  end  
end

before do
  if request.request_method == "POST"
    body_parameters = request.body.read
    params.merge!(JSON.parse(body_parameters))
  end
  request.path_info = '/' unless request_headers['x_api_key'] == ENV['api_key']
end

get '/' do
  "Welcome to the Presto API"
end

get '/card_status/:card_number' do
  PrestoAPI::Client.new.card_status_with_number(params[:card_number]).to_json
end

get '/card_status/:username/:password' do
  PrestoAPI::Client.new.card_status_with_username_password(params[:username], params[:password]).to_json
end

get '/me/:username/:password' do
  PrestoAPI::Client.new.user_with_username_password(params[:username], params[:password]).to_json
end

get '/transaction_history/:username/:password' do
  PrestoAPI::Client.new.transaction_history_with_username_password(params[:username], params[:password]).map(&:to_json).to_json
end

post '/balance' do
  credit_card = PrestoAPI::CreditCard.new
  credit_card.name = params[:credit_card_name]
  credit_card.number = params[:credit_card_number]
  credit_card.expiry_month = params[:credit_card_expiry_month]
  credit_card.expiry_year = params[:credit_card_expiry_year]

  PrestoAPI::Client.new.load_unregistered_card(params[:card_number],
                                               params[:email],
                                               params[:amount],
                                               credit_card).to_json
end