gistfile1.rb

# encoding: utf-8
require 'yaml'

module Proxy
  OVERRIDEN_METHODS = %w(get post put delete).freeze
  APP_CONFIG = YAML.load(File.open File.join(File.dirname(__FILE__), '../config/application.yml'))

  def self.included(base)
    base.class_eval do
      OVERRIDEN_METHODS.each do |method|
        alias_method "#{method}_without_api_key", method
        alias_method method, "#{method}_with_api_key"
      end
    end
  end

  OVERRIDEN_METHODS.each do |m|
    define_method("#{m}_with_api_key") do |*args, &block|
      args[0] = set_api_key(args[0])
      send("#{m}_without_api_key", args, &block)
    end
  end

  private
  def set_api_key(path)
    "#{path}#{url_separator(path)}api_key=#{APP_CONFIG['api_key']}"
  end

  def url_separator(path)
    path.include?('?') ? '&' : '?'
  end
end

Net::HTTP.send :include, Proxy