local.rb in mongo-2.18.0

- old
+ new

@@ -21,15 +21,19 @@
       module Local
         # Local KMS Credentials object contains credentials for using local KMS provider.
         #
         # @api private
         class Credentials
+          extend Forwardable
           include KMS::Validations
 
           # @return [ String ] Master key.
           attr_reader :key
 
+          # @api private
+          def_delegator :@opts, :empty?
+
           FORMAT_HINT = "Local KMS provider options must be in the format: " +
                         "{ key: 'MASTER-KEY' }"
 
           # Creates a local KMS credentials object form a parameters hash.
           #
@@ -38,14 +42,18 @@
           # @option opts [ String ] :key Master key.
           #
           # @raise [ ArgumentError ] If required options are missing or incorrectly
           #   formatted.
           def initialize(opts)
-            @key = validate_param(:key, opts, FORMAT_HINT)
+            @opts = opts
+            unless empty?
+              @key = validate_param(:key, opts, FORMAT_HINT)
+            end
           end
 
           # @return [ BSON::Document ] Local KMS credentials in libmongocrypt format.
           def to_document
+            return BSON::Document.new({}) if empty?
             BSON::Document.new({
               key: BSON::Binary.new(@key, :generic),
             })
           end
         end