catstodon/app/validators/ed25519_signature_validator.rb

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2020-06-02 19:24:53 +02:00
# frozen_string_literal: true
class Ed25519SignatureValidator < ActiveModel::EachValidator
def validate_each(record, attribute, value)
return if value.blank?
verify_key = Ed25519::VerifyKey.new(Base64.decode64(option_to_value(record, :verify_key)))
signature = Base64.decode64(value)
message = option_to_value(record, :message)
record.errors[attribute] << I18n.t('crypto.errors.invalid_signature') unless verified?(verify_key, signature, message)
end
private
def verified?(verify_key, signature, message)
verify_key.verify(signature, message)
rescue Ed25519::VerifyError, ArgumentError
false
end
def option_to_value(record, key)
if options[key].is_a?(Proc)
options[key].call(record)
else
record.public_send(options[key])
end
end
end