glitchier-soc/config/initializers/cookie_rotator.rb

# frozen_string_literal: true

# TODO: Remove after 4.2.0
Rails.application.configure do
  config.active_support.key_generator_hash_digest_class = OpenSSL::Digest::SHA1
end

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

    # TODO: Switch to SHA1 after 4.2.0
    key_generator = ActiveSupport::KeyGenerator.new(
      secret_key_base, iterations: 1000, hash_digest_class: OpenSSL::Digest::SHA256
    )
    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