Allow setting of feature gates per project

For features the feature gates are sometimes projects, not groups or
users. For example for git object pools:
https://gitlab.com/gitlab-com/gl-infra/infrastructure/issues/5872

This commit allows for setting feature group gates based on projects, by its
path as that seems most convenient.

1 files changed, 38 insertions, 0 deletions

diff --git a/lib/feature.rb b/lib/feature.rb
index e048a443abc..e59cd70f822 100644
--- a/lib/feature.rb
+++ b/lib/feature.rb
@@ -102,4 +102,42 @@ class Feature
         expires_in: 1.hour)
     end
   end
+
+  class Target
+    attr_reader :params
+
+    def initialize(params)
+      @params = params
+    end
+
+    def gate_specified?
+      %i(user project feature_group).any? { |key| params.key?(key) }
+    end
+
+    def targets
+      [feature_group, user, project].compact
+    end
+
+    private
+
+    # rubocop: disable CodeReuse/ActiveRecord
+    def feature_group
+      return unless params.key?(:feature_group)
+
+      Feature.group(params[:feature_group])
+    end
+    # rubocop: enable CodeReuse/ActiveRecord
+
+    def user
+      return unless params.key?(:user)
+
+      UserFinder.new(params[:user]).find_by_username!
+    end
+
+    def project
+      return unless params.key?(:project)
+
+      Project.find_by_full_path(params[:project])
+    end
+  end
 end