Class: ActiveSupport::SecureCompareRotator

Inherits:
Object
  • Object
show all
Includes:
Messages::Rotator, SecurityUtils
Defined in:
lib/active_support/secure_compare_rotator.rb

Overview

The ActiveSupport::SecureCompareRotator is a wrapper around ActiveSupport::SecurityUtils.secure_compare and allows you to rotate a previously defined value to a new one.

It can be used as follow:

rotator = ActiveSupport::SecureCompareRotator.new('new_production_value')
rotator.rotate('previous_production_value')
rotator.secure_compare!('previous_production_value')

One real use case example would be to rotate a basic auth credentials:

class MyController < ApplicationController
  def authenticate_request
    rotator = ActiveSupport::SecureCompareRotator.new('new_password')
    rotator.rotate('old_password')

    authenticate_or_request_with_http_basic do |username, password|
      rotator.secure_compare!(password)
    rescue ActiveSupport::SecureCompareRotator::InvalidMatch
      false
    end
  end
end

Constant Summary collapse

InvalidMatch = 
Class.new(StandardError)

Instance Method Summary collapse

Methods included from SecurityUtils

fixed_length_secure_compare, secure_compare

Methods included from Messages::Rotator

#rotate

Constructor Details

#initialize(value, **_options) ⇒ SecureCompareRotator

Returns a new instance of SecureCompareRotator.



36
37
38
 
# File 'lib/active_support/secure_compare_rotator.rb', line 36

def initialize(value, **_options)
  @value = value
end

Instance Method Details

#secure_compare!(other_value, on_rotation: @on_rotation) ⇒ Object 



40
41
42
43
44
 
# File 'lib/active_support/secure_compare_rotator.rb', line 40

def secure_compare!(other_value, on_rotation: @on_rotation)
  secure_compare(@value, other_value) ||
    run_rotations(on_rotation) { |wrapper| wrapper.secure_compare!(other_value) } ||
    raise(InvalidMatch)
end