Vojtěch Kusý wojtha

Adding an audit log to your Rails app

If you have any sort of administrative interface on your web site, you can easily imagine an intruder gaining access and mucking about. How do you know the extent of the damage? Adding an audit log to your app is one quick solution. An audit log should record a few things:

controller entry points with parameter values
permanent information about the user, like user_id
transient information about the user, like IP and user_agent

Using the Rails framework, this is as simple as adding a before_action to your admin controllers. Here’s a basic version that I’m using in production.

#A brief intro into Stateless functions#

So stateless functions are new in React 0.14 which are quite interesting. They look a bit like this.

const Test = ({name, amount}) => {
  return <div className="test">{name} has £{amount}</div>;
};

ReactDOM.render(<Test name="ben" amount="-2000" />) //  <div className="test">ben has £-200</div>

	"""Utility functions"""

	from functools import reduce
	from operator import getitem
	from typing import Any, Mapping, Union


	def getdeep(data: Mapping, map_list: Union[list, str], default: Any = None) -> Any:
	"""Iterate nested dictionary\|list and can return default value if key not found

	# Stick this in your home directory and point your Global Git config at it by running:
	#
	# $ git config --global core.attributesfile ~/.gitattributes
	#
	# See https://tekin.co.uk/2020/10/better-git-diff-output-for-ruby-python-elixir-and-more for more details

	*.c diff=cpp
	*.h diff=cpp
	*.c++ diff=cpp
	*.h++ diff=cpp

	#!/usr/bin/env ruby
	#
	# Prerequisites:
	# gem install bundler
	# bundle install

	dependencies = `bundle show \| grep '*' \| awk '{print $2, $3}' \| sed -e 's/(//' -e 's/)//'`.split("\n")

	dependencies.each do \|dependency\|
	(gem_name, version) = dependency.split

	begin
	require "bundler/inline"
	rescue LoadError => e
	$stderr.puts "Bundler version 1.10 or later is required. Please update your Bundler"
	raise e
	end

	gemfile(true) do
	source "https://rubygems.org"

	require 'rails_event_store'
	require 'aggregate_root'

	PaymentAuthorized = Class.new(RailsEventStore::Event)
	PaymentSuccessed = Class.new(RailsEventStore::Event)
	PaymentFailed = Class.new(RailsEventStore::Event)
	PaymentCaptured = Class.new(RailsEventStore::Event)

	class Payment
	InvalidOperation = Class.new(StandardError)

Vojtěch Kusý wojtha

Table of Contents

set -e, -u, -x, -o pipefail

Adding an audit log to your Rails app

	class Dog
	attr_writer :name

	def initialize(name)
	@name = name
	end

	def bark
	puts "patrick"
	end