ISSUE-264 | Add custom Policy macros

.reek.yml

@@ -48,6 +48,7 @@ detectors:
       - Service::JsonApi::ErrorDataStructureParser#plain_errors?
       - Service::JsonApi::UriQueryErrorSerializer#compose_nested_errors
       - Macro::Contract::BaseSchemaObject#build_schema
+      - Macro::Policy::Pundit::Condition#result!
 
   LongParameterList:
     max_params: 6

config/credentials/development.yml.enc

@@ -1 +1 @@
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lib/macro/pundit.rb

@@ -0,0 +1,40 @@
+# frozen_string_literal: true
+
+module Macro # :reek:MissingSafeMethod { exclude: [ result! ] }
+  module Policy
+    def self.Pundit(policy_class, action, user: nil, model: nil, name: :default)
+      Trailblazer::Macro::Policy.step(Pundit.build(policy_class, action, user: user, model: model), name: name)
+    end
+
+    module Pundit
+      def self.build(*args, &block)
+        Condition.new(*args, &block)
+      end
+
+      class Condition
+        def initialize(policy_class, action, user: nil, model: nil)
+          @policy_class, @user, @model, @action = policy_class, user, model, action
+        end
+
+        def call((options), *)
+          policy = build_policy(options)
+          result!(policy.send(@action), policy)
+        end
+
+        private
+
+        def build_policy(options)
+          @policy_class.new(@user, @model) if @user && @model
+          @policy_class.new(options[:current_user], options[:model]) unless @user && @model
+        end
+
+        def result!(success, policy)
+          data = { policy: policy }
+          data[:message] = 'Breach' unless success
+
+          Trailblazer::Operation::Result.new(success, data)
+        end
+      end
+    end
+  end
+end

spec/lib/macro/pundit_spec.rb

@@ -0,0 +1,38 @@
+# frozen_string_literal: true
+
+RSpec.describe Macro do
+  describe '.Pundit' do
+    class Auth
+      def only_user?
+        @user == Module && @model.nil?
+      end
+    end
+
+    # rubocop:disable RSpec/LeakyConstantDeclaration
+    OperationPolicyPundit = Class.new(Trailblazer::Operation) do
+      step Macro::Policy::Pundit(Auth, :only_user?)
+      step :process
+
+      def process(options, **)
+        options[:process] = true
+      end
+    end
+    # rubocop:enable RSpec/LeakyConstantDeclaration
+
+    context 'when successful' do
+      let(:result) { OperationPolicyPundit.call(params: {}, current_user: Module) }
+
+      it 'process to be truthy' do
+        expect(result[:process]).to be true
+      end
+    end
+
+    context 'when breach' do
+      let(:result) { OperationPolicyPundit.call(params: {}, current_user: nil) }
+
+      it 'process to be falsey' do
+        expect(result[:process]).to be nil
+      end
+    end
+  end
+end