POC allow registration when service is closed

app/controllers/admin/closed_registration_users_controller.rb

@@ -0,0 +1,21 @@
+class Admin::ClosedRegistrationUsersController < SuperAdminController
+  def index
+    @users = ClosedRegistrationUser.all
+    @user = ClosedRegistrationUser.new
+  end
+
+  def new
+    @user = ClosedRegistrationUser.new
+  end
+
+  def create
+    @user = ClosedRegistrationUser.new(params[:closed_registration_user].permit(:email))
+    if @user.save
+      flash[:success] = "New closed registration user created"
+      redirect_to admin_closed_registration_users_path
+    else
+      flash[:error] = "Can not create a user"
+      render :index
+    end
+  end
+end

app/controllers/application_controller.rb

@@ -2,6 +2,8 @@ class ApplicationController < ActionController::Base
   default_form_builder GOVUKDesignSystemFormBuilder::FormBuilder
 
   before_action :set_sentry_user
+  # This will be moved to more suitable place in the implementation
+  before_action :set_feature_flag_users
 
 private
 
@@ -41,4 +43,9 @@ def current_admin
     Admin.find_by(id: session[:admin_id])
   end
   helper_method :current_admin
+
+  def set_feature_flag_users
+    users = User.where(email: ClosedRegistrationUser.pluck(:email))
+    users.each { |u| Flipper.enable_actor(Feature::REGISTRATION_OPEN, u) }
+  end
 end

app/controllers/registration_wizard_controller.rb

@@ -1,4 +1,5 @@
 class RegistrationWizardController < ApplicationController
+  before_action :registration_closed
   before_action :set_wizard
   before_action :set_form
   before_action :check_end_of_journey, only: %i[update]
@@ -49,12 +50,20 @@ def check_end_of_journey
     end
   end
 
+  def registration_closed
+    return if request.path == registration_wizard_show_path(:closed)
+
+    if Feature.registration_closed?(current_user)
+      redirect_to registration_wizard_show_path(:closed)
+    end
+  end
+
   def store
     session["registration_store"] ||= {}
   end
 
   def wizard_params
-    return {} if Feature.registration_closed?
+    return {} if Feature.registration_closed?(current_user)
 
     params.fetch(:registration_wizard, {}).permit(RegistrationWizard.permitted_params_for_step(params[:step].underscore))
   end

app/models/closed_registration_user.rb

@@ -0,0 +1,2 @@
+class ClosedRegistrationUser < ApplicationRecord
+end

app/models/registration_wizard.rb

@@ -59,7 +59,8 @@ class InvalidStep < StandardError; end
   attr_reader :current_step, :params, :store, :request, :current_user
 
   def initialize(current_step:, store:, request:, current_user:, params: {})
-    current_step = :closed if Feature.registration_closed?
+    # current_step = :closed if Feature.registration_closed?
+
     set_current_step(current_step)
 
     @current_user = current_user

app/services/feature.rb

@@ -1,11 +1,11 @@
 class Feature
   REGISTRATION_OPEN_DATE = Time.zone.parse("6 June 2022 12:00")
 
-  REGISTRATION_CLOSED_KEY = "Registration closed".freeze
+  REGISTRATION_OPEN = "Registration open".freeze
   REGISTRATION_DISABLED = "Registration disabled".freeze
 
   FEATURE_FLAG_KEYS = [
-    REGISTRATION_CLOSED_KEY,
+    REGISTRATION_OPEN,
   ].freeze
 
   class << self
@@ -27,8 +27,8 @@ def trn_required?
       true
     end
 
-    def registration_closed?
-      Flipper.enabled?(REGISTRATION_CLOSED_KEY)
+    def registration_closed?(user)
+      !Flipper.enabled?(REGISTRATION_OPEN, user)
     end
 
     def registration_disabled?

app/views/admin/closed_registration_users/index.html.erb

@@ -0,0 +1,35 @@
+<div class="govuk-grid-row">
+  <div class="govuk-grid-column-full">
+    <%= render "admin/layout", title: "Closed registration users" %>
+
+    <h2 class="govuk-heading-l">Add new email</h2>
+    <%= form_for [:admin, @user] do |f| %>
+      <%= f.govuk_error_summary %>
+      <%= f.govuk_text_field :email,  legend: { text: 'Provide course start date' } %>
+      <%= f.govuk_submit "Save" %>
+    <% end %>
+
+    <h2 class="govuk-heading-l">Currently allowed emails</h2>
+
+    <table class="govuk-table">
+      <thead class="govuk-table__head">
+      <tr class="govuk-table__row">
+        <th scope="col" class="govuk-table__header">User</th>
+        <th scope="col" class="govuk-table__header">Has account</th>
+        <th scope="col" class="govuk-table__header">Last application date</th>
+      </tr>
+      </thead>
+
+      <tbody class="govuk-table__body">
+      <% @users.each do |user| %>
+        <tr class="govuk-table__row">
+          <td class="govuk-table__cell"><%= user.email %></td>
+          <td class="govuk-table__cell"><%=  %></td>
+          <td class="govuk-table__cell"></td>
+        </tr>
+      <% end %>
+      </tbody>
+    </table>
+
+  </div>
+</div>

app/views/admin/closed_registration_users/new.html.erb

@@ -0,0 +1,13 @@
+<h1>Admin::LateRegistrants#new</h1>
+<p>Find me in app/views/admin/late_registrants/new.html.erb</p>
+
+<div class="govuk-grid-row">
+  <div class="govuk-grid-column-full">
+    <%= render "admin/layout", title: "Settings" %>
+    <%= form_for [:admin, @user] do |f| %>
+      <%= f.govuk_error_summary %>
+      <%= f.govuk_text_field :email,  legend: { text: 'Provide course start date' } %>
+      <%= f.govuk_submit "Save" %>
+    <% end %>
+  </div>
+</div>

config/routes.rb

@@ -43,6 +43,8 @@
   end
 
   namespace :admin do
+    get 'closed_registration_users/index'
+    get 'closed_registration_users/new'
     resources :applications, only: %i[index show] do
       # This routes are only written for review apps in order to update the external statuses
       member do
@@ -70,6 +72,7 @@
     constraints HasFlipperAccess do
       mount Flipper::UI.app(Flipper) => "/feature_flags"
     end
+    resources :closed_registration_users
   end
 
   get "/admin", to: "admin#show"

db/migrate/20240215174211_add_allow_closed_registration_to_users.rb

@@ -0,0 +1,5 @@
+class AddAllowClosedRegistrationToUsers < ActiveRecord::Migration[7.1]
+  def change
+    add_column :users, :allow_closed_registration, :boolean
+  end
+end

db/migrate/20240215174312_create_closed_registration_users.rb

@@ -0,0 +1,9 @@
+class CreateClosedRegistrationUsers < ActiveRecord::Migration[7.1]
+  def change
+    create_table :closed_registration_users do |t|
+      t.string :email
+
+      t.timestamps
+    end
+  end
+end