Remove unused custom FeatureToggle implementation

Flipper is now our only source of truth regarding feature toggles.

lib/open_food_network/feature_toggle.rb

@@ -1,63 +1,15 @@
 module OpenFoodNetwork
-  # This feature toggles implementation provides two mechanisms to conditionally enable features.
+  # Feature toggles are configured via Flipper.
   #
-  # You can configure features via the Flipper config and web interface. See:
+  # We define features in the initializer and then it can be customised via the
+  # web interface on each server.
   #
   # - config/initializers/flipper.rb
   # - http://localhost:3000/admin/feature-toggle/features
   #
-  # Alternatively, you can choose which users have the feature toggled on. To do that you need to
-  # register the feature and its users from an initializer like:
-  #
-  #   require 'open_food_network/feature_toggle'
-  #   OpenFoodNetwork::FeatureToggle.enable(:new_shiny_feature, ['ofn@example.com'])
-  #
-  # Note, however, that it'd be better to read the user emails from an ENV var provisioned with
-  # ofn-install:
-  #
-  #   require 'open_food_network/feature_toggle'
-  #   OpenFoodNetwork::FeatureToggle.enable(:new_shiny_feature, ENV['PRODUCT_TEAM'])
-  #
-  # You can then check it from a view like:
-  #
-  #   - if feature? :new_shiny_feature, spree_current_user
-  #     = render "new_shiny_feature"
-  #
   module FeatureToggle
     def self.enabled?(feature_name, user = nil)
-      features = Thread.current[:features] || {}
-
-      if Flipper[feature_name].exist?
-        Flipper.enabled?(feature_name, user)
-      else
-        feature = features.fetch(feature_name, DefaultFeature.new)
-        feature.enabled?(user)
-      end
-    end
-
-    def self.enable(feature_name, &block)
-      Thread.current[:features] ||= {}
-      Thread.current[:features][feature_name] = Feature.new(block)
-    end
-  end
-
-  class Feature
-    def initialize(block)
-      @block = block
-    end
-
-    def enabled?(user)
-      block.call(user)
-    end
-
-    private
-
-    attr_reader :block
-  end
-
-  class DefaultFeature
-    def enabled?(_user)
-      false
+      Flipper.enabled?(feature_name, user)
     end
   end
 end

spec/lib/open_food_network/feature_toggle_spec.rb

@@ -14,34 +14,5 @@ module OpenFoodNetwork
         expect(FeatureToggle.enabled?(:foo)).to be true
       end
     end
-
-    context 'when specifying users' do
-      let(:insider) { build(:user) }
-      let(:outsider) { build(:user, email: "different") }
-
-      context 'and the block does not specify arguments' do
-        before do
-          FeatureToggle.enable(:foo) { 'return value' }
-        end
-
-        it "returns the block's return value" do
-          expect(FeatureToggle.enabled?(:foo, insider)).to eq('return value')
-        end
-      end
-
-      context 'and the block specifies arguments' do
-        let(:users) { [insider.email] }
-
-        before do
-          FeatureToggle.enable(:foo) { |user| users.include?(user&.email) }
-        end
-
-        it "returns the block's return value" do
-          expect(FeatureToggle.enabled?(:foo, insider)).to eq(true)
-          expect(FeatureToggle.enabled?(:foo, outsider)).to eq(false)
-          expect(FeatureToggle.enabled?(:foo, nil)).to eq(false)
-        end
-      end
-    end
   end
 end