Allow disabling of account creation via environment variable

app/controllers/registrations_controller.rb

@@ -1,6 +1,7 @@
 # frozen_string_literal: true
 
 class RegistrationsController < Devise::RegistrationsController
+  prepend_before_action :require_account_creation, only: [:create, :new]
   prepend_before_action :check_captcha, only: [:create]
 
   def create
@@ -44,4 +45,11 @@ def check_captcha
       respond_with_navigational(resource) { render :new }
     end
   end
+
+  def require_account_creation
+    if Feature.inactive?(:account_creation)
+      flash[:error] = 'Account sign-up is not currently open'
+      redirect_to root_path, status: :see_other
+    end
+  end
 end

app/views/layouts/_navigation.html.haml

@@ -32,16 +32,17 @@
                 = render 'layouts/user_menu'
       - else
         %ul.nav.navbar-nav.navbar-right
-          - if ENV.fetch('OSEM_ICHAIN_ENABLED', nil) == 'true'
-            %li{class: "#{active_nav_li(new_ichain_registration_path('user'))}"}
-              = link_to(new_ichain_registration_path('user')) do
-                %span.fa-solid.fa-heart
-                Sign Up
-          - else
-            %li{class: "#{active_nav_li(new_registration_path('user'))}"}
-              = link_to(new_registration_path('user')) do
-                %span.fa-solid.fa-heart
-                Sign Up
+          - if Feature.active?(:account_creation)
+            - if ENV.fetch('OSEM_ICHAIN_ENABLED', nil) == 'true'
+              %li{class: "#{active_nav_li(new_ichain_registration_path('user'))}"}
+                = link_to(new_ichain_registration_path('user')) do
+                  %span.fa-solid.fa-heart
+                  Sign Up
+            - else
+              %li{class: "#{active_nav_li(new_registration_path('user'))}"}
+                = link_to(new_registration_path('user')) do
+                  %span.fa-solid.fa-heart
+                  Sign Up
           %li.dropdown.visible-desktop
             %a.dropdown-toggle{"data-toggle" => "dropdown", href: '#'}
               %span.fa-solid.fa-user

config/initializers/feature.rb

@@ -3,6 +3,9 @@
 repo = Feature::Repository::SimpleRepository.new
 
 # configure features here
+unless ActiveRecord::Type::Boolean.new.cast(ENV.fetch('DISABLE_ACCOUNT_CREATION', 'false'))
+  repo.add_active_feature :account_creation
+end
 unless(ENV['RECAPTCHA_SITE_KEY'].blank? || ENV['RECAPTCHA_SECRET_KEY'].blank?)
   repo.add_active_feature :recaptcha
 end