Merge pull request #4 from Mastercard/feature/decrypt_a_primitive_type_value

Decrypt a primitive type value to the same path than the encrypted data fields.

Author: ech0s7r

lib/mcapi/encryption/field_level_encryption.rb

@@ -99,10 +99,15 @@ def encrypt_with_header(path, enc_params, header, body)
       def decrypt_with_body(path, body)
         elem = elem_from_path(path['element'], body)
         return unless elem && elem[:node]
+        decrypted = @crypto.decrypt_data(elem[:node][@config['encryptedValueFieldName']],
+                                 elem[:node][@config['ivFieldName']],
+                                 elem[:node][@config['encryptedKeyFieldName']])
+        begin
+          decrypted = JSON.parse(decrypted)
+        rescue JSON::ParserError
+          # ignored
+        end
 
-        decrypted = JSON.parse(@crypto.decrypt_data(elem[:node][@config['encryptedValueFieldName']],
-                                                    elem[:node][@config['ivFieldName']],
-                                                    elem[:node][@config['encryptedKeyFieldName']]))
         McAPI::Utils.mutate_obj_prop(path['obj'], decrypted, body, path['element'], @encryption_response_properties)
       end
 

test/test_payload_encryption.rb

@@ -125,4 +125,23 @@ def test_decrypt_nested_properties_create_new_obj
     assert_equal body['path']['to']['foo']['accountNumber'], '5123456789012345'
     assert !body['path']['to']['encryptedFoo']
   end
+
+  def test_decrypt_primitive_type
+    fle = McAPI::Encryption::FieldLevelEncryption.new(@test_config)
+    body = JSON.parse(JSON.generate(
+        data: {
+            encryptedValue:
+                '982f5df1dfff3cc551a49091140cbb22',
+            iv: '6f38f3ecd8b92c2fd2537a7235deb9a8',
+            encryptedKey:
+                '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',
+            publicKeyFingerprint:
+                '80810fc13a8319fcf0e2ec322c82a4c304b782cc3ce671176343cfe8160c2279',
+            oaepHashingAlgorithm: 'SHA512'
+        }
+    ))
+    fle.send :decrypt_with_body, JSON.parse(JSON.generate(element: 'data', obj: 'data')), body
+    assert body['data']
+    assert_equal body['data'], 'string'
+  end
 end