1 files changed, 50 insertions, 0 deletions
diff --git a/lib/api/feature_flags.rb b/lib/api/feature_flags.rb
new file mode 100644
index 00000000000..dff43544a75
--- /dev/null
+++ b/lib/api/feature_flags.rb
@@ -0,0 +1,50 @@
+module API
+  class FeatureFlags < Grape::API
+    include PaginationParams
+
+    resource :feature_flags do
+      resource :projects, requirements: API::PROJECT_ENDPOINT_REQUIREMENTS do
+        params do
+          requires :id, type: String, desc: 'The ID of a project'
+        end
+        route_param :id do
+          resource :unleash do
+            before do
+              authenticate_by_unleash_access_token!
+            end
+
+            get 'features' do
+              present project, with: Entities::UnleashFeatures
+            end
+
+            post 'client/register' do
+              # not supported yet
+              status :ok
+            end
+
+            post 'client/metrics' do
+              # not supported yet
+              status :ok
+            end
+          end
+        end
+      end
+
+      helpers do
+        def project
+          @project ||= find_project(params[:id])
+        end
+
+        def unleash_instanceid
+          params[:instanceid] || env[:HTTP_UNLEASH_INSTANCEID]
+        end
+
+        def authenticate_by_unleash_access_token!
+          unless Operations::FeatureFlagsAccessToken.find_by(token: unleash_instanceid, project: project)
+            unauthorized!
+          end
+        end
+      end
+    end
+  end
+end