demarches-normaliennes/config/initializers/cookie_rotator.rb

# frozen_string_literal: true

# This cookie rotator converts cookies from the old SHA1 hash (Rails 6) to SHA256 hash (Rails 7 default).
# It should be kept enabled for approximately 1 month to ensure most users have their cookies rotated.
# After this period, it can be safely removed.
# Without this rotator, all users would have been signed out.
Rails.application.config.after_initialize do
  Rails.application.config.action_dispatch.cookies_rotations.tap do |cookies|
    authenticated_encrypted_cookie_salt = Rails.application.config.action_dispatch.authenticated_encrypted_cookie_salt
    signed_cookie_salt = Rails.application.config.action_dispatch.signed_cookie_salt
    secret_key_base = Rails.application.secret_key_base

    key_generator = ActiveSupport::KeyGenerator.new(
      secret_key_base, iterations: 1000, hash_digest_class: OpenSSL::Digest::SHA1 # Rails 6 hash
    )
    key_len = ActiveSupport::MessageEncryptor.key_len

    old_encrypted_secret = key_generator.generate_key(authenticated_encrypted_cookie_salt, key_len)
    old_signed_secret = key_generator.generate_key(signed_cookie_salt)

    cookies.rotate :encrypted, old_encrypted_secret
    cookies.rotate :signed, old_signed_secret
  end
end