3 files changed, 59 insertions, 0 deletions
diff --git a/lib/api/api.rb b/lib/api/api.rb
index bbdd2039f43..7ae2f3cad40 100644
--- a/lib/api/api.rb
+++ b/lib/api/api.rb
@@ -94,6 +94,7 @@ module API
     mount ::API::DeployKeys
     mount ::API::Deployments
     mount ::API::Environments
+    mount ::API::Features
     mount ::API::Files
     mount ::API::Groups
     mount ::API::Internal
diff --git a/lib/api/entities.rb b/lib/api/entities.rb
index e10bd230ae2..fc8183a62c1 100644
--- a/lib/api/entities.rb
+++ b/lib/api/entities.rb
@@ -753,6 +753,28 @@ module API
       expose :impersonation
     end
 
+    class FeatureGate < Grape::Entity
+      expose :key
+      expose :value
+    end
+
+    class Feature < Grape::Entity
+      expose :name
+      expose :state
+      expose :gates, using: FeatureGate do |model|
+        model.gates.map do |gate|
+          value = model.gate_values[gate.key]
+
+          # By default all gate values are populated. Only show relevant ones.
+          if (value.is_a?(Integer) && value.zero?) || (value.is_a?(Set) && value.empty?)
+            next
+          end
+
+          { key: gate.key, value: value }
+        end.compact
+      end
+    end
+
     module JobRequest
       class JobInfo < Grape::Entity
         expose :name, :stage
diff --git a/lib/api/features.rb b/lib/api/features.rb
new file mode 100644
index 00000000000..cff0ba2ddff
--- /dev/null
+++ b/lib/api/features.rb
@@ -0,0 +1,36 @@
+module API
+  class Features < Grape::API
+    before { authenticated_as_admin! }
+
+    resource :features do
+      desc 'Get a list of all features' do
+        success Entities::Feature
+      end
+      get do
+        features = Feature.all
+
+        present features, with: Entities::Feature, current_user: current_user
+      end
+
+      desc 'Set the gate value for the given feature' do
+        success Entities::Feature
+      end
+      params do
+        requires :value, type: String, desc: '`true` or `false` to enable/disable, an integer for percentage of time'
+      end
+      post ':name' do
+        feature = Feature.get(params[:name])
+
+        if %w(0 false).include?(params[:value])
+          feature.disable
+        elsif params[:value] == 'true'
+          feature.enable
+        else
+          feature.enable_percentage_of_time(params[:value].to_i)
+        end
+
+        present feature, with: Entities::Feature, current_user: current_user
+      end
+    end
+  end
+end