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# frozen_string_literal: true
module ActiveSupport
module Messages
module Rotator # :nodoc:
def initialize(*args)
super
@rotations = []
end
def rotate(*args)
@rotations << create_rotation(*args)
end
module Encryptor
include Rotator
def decrypt_and_verify(*args, on_rotation: nil, **options)
super
rescue MessageEncryptor::InvalidMessage, MessageVerifier::InvalidSignature
run_rotations(on_rotation) { |encryptor| encryptor.decrypt_and_verify(*args, options) } || raise
end
private
def create_rotation(raw_key: nil, raw_signed_key: nil, **options)
self.class.new \
raw_key || extract_key(options),
raw_signed_key || extract_signing_key(options),
options.slice(:cipher, :digest, :serializer)
end
def extract_key(cipher:, salt:, key_generator: nil, secret: nil, **)
key_generator ||= key_generator_for(secret)
key_generator.generate_key(salt, self.class.key_len(cipher))
end
def extract_signing_key(cipher:, signed_salt: nil, key_generator: nil, secret: nil, **)
if cipher.downcase.end_with?("cbc")
raise ArgumentError, "missing signed_salt for signing key generation" unless signed_salt
key_generator ||= key_generator_for(secret)
key_generator.generate_key(signed_salt)
end
end
end
module Verifier
include Rotator
def verified(*args, on_rotation: nil, **options)
super || run_rotations(on_rotation) { |verifier| verifier.verified(*args, options) }
end
private
def create_rotation(raw_key: nil, digest: nil, serializer: nil, **options)
self.class.new(raw_key || extract_key(options), digest: digest, serializer: serializer)
end
def extract_key(key_generator: nil, secret: nil, salt:)
key_generator ||= key_generator_for(secret)
key_generator.generate_key(salt)
end
end
private
def key_generator_for(secret)
ActiveSupport::KeyGenerator.new(secret, iterations: 1000)
end
def run_rotations(on_rotation)
@rotations.find do |rotation|
if message = yield(rotation) rescue next
on_rotation.call if on_rotation
return message
end
end
end
end
end
end
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