Cherrypicking files from Dan's PR (to squash)

app/controllers/application_controller.rb

@@ -1,5 +1,6 @@
 class ApplicationController < ActionController::Base
   include ApplicationHelper
+  include RoutesHelper
 
   default_form_builder(GOVUKDesignSystemFormBuilder::FormBuilder)
 
@@ -19,4 +20,22 @@ def current_user
   def support_user
     @support_user ||= sign_in_user&.support_user
   end
+
+  def after_sign_in_path
+    return support_root_path if support_user.present?
+
+    root_path
+  end
+
+  def after_sign_out_path
+    sign_in_path
+  end
+
+  def authenticate_user!
+    return if current_user
+
+    session[:requested_path] = request.fullpath
+
+    redirect_to sign_in_path
+  end
 end

app/controllers/placements/support/application_controller.rb

@@ -0,0 +1,13 @@
+class Placements::Support::ApplicationController < ApplicationController
+  before_action :authenticate_support_user!
+
+  private
+
+  def authenticate_support_user!
+    authenticate_user!
+
+    if support_user.blank?
+      redirect_to placements_root_path, alert: "You cannot perform this action"
+    end
+  end
+end

app/controllers/sessions_controller.rb

@@ -7,7 +7,7 @@ def callback
     if current_user
       # DfESignInUsers::Update.call(user: current_user, sign_in_user: sign_in_user)
 
-      redirect_to(root_path)
+      redirect_to after_sign_in_path
     else
       # session.delete(:requested_path)
       DfESignInUser.end_session!(session)

app/helpers/routes_helper.rb

@@ -0,0 +1,19 @@
+module RoutesHelper
+  def root_path
+    case current_service
+    when :claims
+      claims_root_path
+    when :placements
+      placements_root_path
+    end
+  end
+
+  def support_root_path
+    case current_service
+    # when :claims
+    #   claims_support_root_path # TODO: claims support path in another PR
+    when :placements
+      placements_support_root_path
+    end
+  end
+end

app/models/dfe_sign_in_user.rb

@@ -78,6 +78,5 @@ def support_user_klass
     when :placements
       Placements::SupportUser
     end
-
   end
 end

config/routes/placements.rb

@@ -4,4 +4,9 @@
         host: ENV["PLACEMENTS_HOST"]
       } do
   root to: "pages#index"
+
+  namespace :support do
+    root to: redirect("/support/organisations")
+    resources :organisations, only: :index
+  end
 end

spec/factories/users.rb

@@ -35,7 +35,9 @@
     service { "placements" }
   end
 
-  factory :placements_support_user, class: "Placements::SupportUser", parent: :user do
+  factory :placements_support_user,
+          class: "Placements::SupportUser",
+          parent: :user do
     service { "placements" }
   end
 end