Add Unauthorized response template

CHANGELOG.md

@@ -7,6 +7,10 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 
 ## [Unreleased]
 
+### Added
+
+- Added `Unauthorized` response template
+
 ## [2.0.0]
 
 First Pragma 2 release.

lib/pragma/operation.rb

@@ -16,6 +16,7 @@
 require 'pragma/operation/response/created'
 require 'pragma/operation/response/ok'
 require 'pragma/operation/response/no_content'
+require 'pragma/operation/response/unauthorized'
 
 module Pragma
   # Operations provide business logic encapsulation for your JSON API.

lib/pragma/operation/response/unauthorized.rb

@@ -0,0 +1,19 @@
+# frozen_string_literal: true
+
+module Pragma
+  module Operation
+    class Response
+      class Unauthorized < Response
+        def initialize(
+          entity: Error.new(
+            error_type: :unauthorized,
+            error_message: 'This resource requires authentication.',
+          ),
+          headers: {}
+        )
+          super(status: 401, entity: entity, headers: headers)
+        end
+      end
+    end
+  end
+end