1# frozen_string_literal: true
 2
 3module Xml
 4  module Kit
 5    # An implementation of the EncryptedKey element.
 6    # https://www.w3.org/TR/xmlenc-core1/#sec-EncryptedData
 7    #
 8    # @since 0.3.0
 9    class EncryptedData
10      attr_reader :id
11      attr_reader :key_info
12      attr_reader :symmetric_cipher
13      attr_reader :symmetric_cipher_value
14
15      def initialize(raw_xml,
16                     id: Id.generate,
17                     symmetric_cipher: nil,
18                     asymmetric_cipher: nil,
19                     key_info: nil)
20        @id = id
21        @symmetric_cipher = symmetric_cipher ||
22          key_info.try(:symmetric_cipher) ||
23          Xml::Kit::Crypto::SymmetricCipher.new
24        @symmetric_cipher_value = Base64.strict_encode64(
25          @symmetric_cipher.encrypt(raw_xml)
26        )
27        @key_info = key_info ||
28          create_key_info_for(@symmetric_cipher, asymmetric_cipher)
29      end
30
31      def to_xml(xml: ::Builder::XmlMarkup.new)
32        ::Xml::Kit::Template.new(self).to_xml(xml: xml)
33      end
34
35      def render(model, options)
36        ::Xml::Kit::Template.new(model).to_xml(options)
37      end
38
39      private
40
41      def create_key_info_for(symmetric_cipher, asymmetric_cipher)
42        KeyInfo.new do |x|
43          x.encrypted_key = EncryptedKey.new(
44            asymmetric_cipher: asymmetric_cipher,
45            symmetric_cipher: symmetric_cipher
46          )
47        end
48      end
49    end
50  end
51end