config/initializers/cookie_rotation.rb
# See https://guides.rubyonrails.org/upgrading_ruby_on_rails.html#key-generator-digest-class-change-requires-a-cookie-rotator
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 = Settings.secret_key_base
key_generator = ActiveSupport::KeyGenerator.new(
secret_key_base, iterations: 1000, hash_digest_class: OpenSSL::Digest::SHA1
)
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