Revert "Remove feature flag"

This reverts commit c40f09be1557047346fec599e62cba5c57486e1b.

app/views/admin/application_settings/_signup.html.haml

@@ -21,6 +21,9 @@
         = f.check_box :send_user_confirmation_email, class: 'form-check-input'
         = f.label :send_user_confirmation_email, class: 'form-check-label' do
           Send confirmation email on sign-up
+
+    = render_if_exists 'admin/application_settings/new_user_signups_cap', form: f
+
     .form-group
       = f.label :minimum_password_length, _('Minimum password length (number of characters)'), class: 'label-bold'
       = f.number_field :minimum_password_length, class: 'form-control', rows: 4, min: ApplicationSetting::DEFAULT_MINIMUM_PASSWORD_LENGTH, max: Devise.password_length.max

changelogs/unreleased/vs-admin-new-user-signups.yml

+---
+title: Add migration to add a new configuration option for setting the new user signups count
+merge_request: 45643
+author:
+type: other

db/migrate/20201019113009_add_new_user_signups_cap_to_application_settings.rb

+# frozen_string_literal: true
+
+class AddNewUserSignupsCapToApplicationSettings < ActiveRecord::Migration[6.0]
+  DOWNTIME = false
+
+  def change
+    add_column :application_settings, :new_user_signups_cap, :integer
+  end
+end

db/schema_migrations/20201019113009

+fe57e8e74ebbe0e9567c1487e6e4f8b499afa6404c73424157c43ae79c005f08
\ No newline at end of file

db/structure.sql

@@ -9305,6 +9305,7 @@ CREATE TABLE application_settings (
     secret_detection_token_revocation_url text,
     encrypted_secret_detection_token_revocation_token text,
     encrypted_secret_detection_token_revocation_token_iv text,
+    new_user_signups_cap integer,
     CONSTRAINT app_settings_registry_exp_policies_worker_capacity_positive CHECK ((container_registry_expiration_policies_worker_capacity >= 0)),
     CONSTRAINT check_2dba05b802 CHECK ((char_length(gitpod_url) <= 255)),
     CONSTRAINT check_51700b31b5 CHECK ((char_length(default_branch_name) <= 255)),

ee/app/controllers/ee/admin/application_settings_controller.rb

@@ -63,6 +63,8 @@ module EE
           attrs << :maintenance_mode_message
         end
 
+        attrs << :new_user_signups_cap if ::Feature.enabled?(:admin_new_user_signups_cap)
+
         attrs
       end
 

ee/app/helpers/ee/application_settings_helper.rb

@@ -22,17 +22,21 @@ module EE
         :allow_group_owners_to_manage_ldap,
         :automatic_purchased_storage_allocation,
         :check_namespace_plan,
-        :elasticsearch_aws,
         :elasticsearch_aws_access_key,
         :elasticsearch_aws_region,
         :elasticsearch_aws_secret_access_key,
+        :elasticsearch_aws,
+        :elasticsearch_client_request_timeout,
+        :elasticsearch_indexed_field_length_limit,
+        :elasticsearch_indexed_file_size_limit_kb,
         :elasticsearch_indexing,
-        :elasticsearch_pause_indexing,
+        :elasticsearch_limit_indexing,
         :elasticsearch_max_bulk_concurrency,
         :elasticsearch_max_bulk_size_mb,
+        :elasticsearch_namespace_ids,
+        :elasticsearch_pause_indexing,
+        :elasticsearch_project_ids,
         :elasticsearch_replicas,
-        :elasticsearch_indexed_file_size_limit_kb,
-        :elasticsearch_indexed_field_length_limit,
         :elasticsearch_search,
         :elasticsearch_shards,
         :elasticsearch_url,
@@ -45,12 +49,12 @@ module EE
         :elasticsearch_analyzers_kuromoji_enabled,
         :elasticsearch_analyzers_kuromoji_search,
         :enforce_namespace_storage_limit,
-        :geo_status_timeout,
+        :enforce_pat_expiration,
         :geo_node_allowed_ips,
+        :geo_status_timeout,
         :help_text,
         :lock_memberships_to_ldap,
         :max_personal_access_token_lifetime,
-        :enforce_pat_expiration,
         :pseudonymizer_enabled,
         :repository_size_limit,
         :seat_link_enabled,
@@ -60,8 +64,8 @@ module EE
         :slack_app_secret,
         :slack_app_verification_token,
         :throttle_incident_management_notification_enabled,
-        :throttle_incident_management_notification_period_in_seconds,
-        :throttle_incident_management_notification_per_period
+        :throttle_incident_management_notification_per_period,
+        :throttle_incident_management_notification_period_in_seconds
       ]
     end
 

ee/app/models/ee/application_setting.rb

@@ -94,6 +94,14 @@ module EE
 
       validate :allowed_frameworks, if: :compliance_frameworks_changed?
 
+      validates :new_user_signups_cap,
+                numericality: { only_integer: true,
+                                allow_nil: true,
+                                greater_than: 0 }
+      validates :new_user_signups_cap,
+                numericality: { less_than_or_equal_to: proc { License.current&.restricted_user_count } },
+                if: proc { License.current&.restricted_user_count? }
+
       after_commit :update_personal_access_tokens_lifetime, if: :saved_change_to_max_personal_access_token_lifetime?
       after_commit :resume_elasticsearch_indexing
     end

ee/app/models/license.rb

@@ -397,6 +397,10 @@ class License < ApplicationRecord
     restricted_attr(:active_user_count)
   end
 
+  def restricted_user_count?
+    restricted_user_count.to_i > 0
+  end
+
   def previous_user_count
     restricted_attr(:previous_user_count)
   end

ee/app/views/admin/application_settings/_new_user_signups_cap.html.haml

+- return unless ::Feature.enabled?(:admin_new_user_signups_cap)
+
+.form-group
+  = form.label :new_user_signups_cap, s_('AdminArea|User cap'), class: 'label-bold'
+  = form.number_field :new_user_signups_cap, class: 'form-control', max: License.current&.restricted_user_count
+  .form-text.text-muted
+    = s_('AdminArea|Once the instance reaches the user cap, any user who is added or requests access will have to be approved by an admin. Leave the field empty for unlimited.')

ee/config/feature_flags/development/admin_new_user_signups_cap.yml

+---
+name: admin_new_user_signups_cap
+introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/45643
+rollout_issue_url:
+type: development
+group: group::purchase
+default_enabled: false

ee/spec/features/admin/admin_settings_spec.rb

@@ -272,6 +272,75 @@ RSpec.describe 'Admin updates EE-only settings' do
     end
   end
 
+  context 'sign up settings' do
+    context 'when feature flag is disabled' do
+      before do
+        stub_feature_flags(admin_new_user_signups_cap: false)
+      end
+
+      it 'does not render user cap form group' do
+        visit general_admin_application_settings_path
+
+        expect(page).not_to have_field('User cap')
+      end
+    end
+
+    context 'when feature flag is enabled' do
+      before do
+        stub_feature_flags(admin_new_user_signups_cap: true)
+      end
+
+      context 'when license has active user count' do
+        let(:license) { create(:license, restrictions: { active_user_count: 1 }) }
+
+        before do
+          allow(License).to receive(:current).and_return(license)
+        end
+
+        it 'disallows entering user cap greater then license allows', :js do
+          visit general_admin_application_settings_path
+
+          page.within('#js-signup-settings') do
+            fill_in 'User cap', with: 5
+
+            click_button 'Save changes'
+
+            message =
+              page.find('#application_setting_new_user_signups_cap').native.attribute('validationMessage')
+
+            expect(message).to eq('Value must be less than or equal to 1.')
+          end
+        end
+      end
+
+      it 'changes the user cap from unlimited to 5' do
+        visit general_admin_application_settings_path
+
+        expect(current_settings.new_user_signups_cap).to be_nil
+
+        page.within('#js-signup-settings') do
+          fill_in 'User cap', with: 5
+
+          click_button 'Save changes'
+
+          expect(current_settings.new_user_signups_cap).to eq(5)
+        end
+      end
+
+      it 'changes the user cap to unlimited' do
+        visit general_admin_application_settings_path
+
+        page.within('#js-signup-settings') do
+          fill_in 'User cap', with: nil
+
+          click_button 'Save changes'
+
+          expect(current_settings.new_user_signups_cap).to be_nil
+        end
+      end
+    end
+  end
+
   def current_settings
     ApplicationSetting.current_without_cache
   end

ee/spec/models/application_setting_spec.rb

@@ -85,6 +85,12 @@ RSpec.describe ApplicationSetting do
     it { is_expected.not_to allow_value(-5).for(:max_personal_access_token_lifetime) }
     it { is_expected.not_to allow_value(366).for(:max_personal_access_token_lifetime) }
 
+    it { is_expected.to allow_value(nil).for(:new_user_signups_cap) }
+    it { is_expected.to allow_value(1).for(:new_user_signups_cap) }
+    it { is_expected.to allow_value(10).for(:new_user_signups_cap) }
+    it { is_expected.not_to allow_value(-1).for(:new_user_signups_cap) }
+    it { is_expected.not_to allow_value(2.5).for(:new_user_signups_cap) }
+
     describe 'when additional email text is enabled' do
       before do
         stub_licensed_features(email_additional_text: true)
@@ -159,6 +165,18 @@ RSpec.describe ApplicationSetting do
         end
       end
     end
+
+    context 'when license presented' do
+      let_it_be(:max_active_user_count) { 20 }
+
+      before_all do
+        create_current_license({ restrictions: { active_user_count: max_active_user_count } })
+      end
+
+      it { is_expected.to allow_value(max_active_user_count - 1).for(:new_user_signups_cap) }
+      it { is_expected.to allow_value(max_active_user_count).for(:new_user_signups_cap) }
+      it { is_expected.not_to allow_value(max_active_user_count + 1).for(:new_user_signups_cap) }
+    end
   end
 
   describe '#should_check_namespace_plan?' do

ee/spec/models/license_spec.rb

@@ -1090,4 +1090,23 @@ RSpec.describe License do
       it { is_expected.to eq(result) }
     end
   end
+
+  describe '#restricted_user_count?' do
+    subject { license.restricted_user_count? }
+
+    where(:restricted_user_count, :result) do
+      nil | false
+      0   | false
+      1   | true
+      10  | true
+    end
+
+    with_them do
+      before do
+        allow(license).to receive(:restricted_user_count).and_return(restricted_user_count)
+      end
+
+      it { is_expected.to eq(result) }
+    end
+  end
 end

locale/gitlab.pot

@@ -1914,6 +1914,9 @@ msgstr ""
 msgid "AdminArea|New user"
 msgstr ""
 
+msgid "AdminArea|Once the instance reaches the user cap, any user who is added or requests access will have to be approved by an admin. Leave the field empty for unlimited."
+msgstr ""
+
 msgid "AdminArea|Owner"
 msgstr ""
 
@@ -1938,6 +1941,9 @@ msgstr ""
 msgid "AdminArea|Total users"
 msgstr ""
 
+msgid "AdminArea|User cap"
+msgstr ""
+
 msgid "AdminArea|Users statistics"
 msgstr ""