feat-allow-multiple-origins

* fix origin extraction code

lib/webauthn/authenticator_response.rb

@@ -122,12 +122,15 @@ def valid_user_verified?
     end
 
     # @return [String, nil]
-    # @param [String, nil] expected_origin
+    # @param [String, Array, nil] expected_origin
     # Extract RP ID from origin in case rp_id is not provided explicitly
     def rp_id_from_origin(expected_origin)
-      return unless expected_origin.is_a?(Array) && expected_origin.size == 1
-
-      URI.parse(expected_origin.first).host
+      case expected_origin
+      when Array
+        URI.parse(expected_origin.first).host if expected_origin.size == 1
+      when String
+        URI.parse(expected_origin).host
+      end
     end
 
     def type