Add access control and :forbidden error handling

app/controllers/application_controller.rb

@@ -1,6 +1,15 @@
 class ApplicationController < ActionController::Base
+  helper_method :current_user_at_least
+
   before_action :authenticate_user!
 
+  class AccessForbidden < StandardError
+  end
+
+  def current_user_at_least(status)
+    User.statuses[current_user.status] >= User.statuses[status]
+  end
+
   protected
 
   def after_sign_out_path_for(scope)

app/controllers/users_controller.rb

@@ -1,7 +1,9 @@
 class UsersController < ApplicationController
-  before_action :set_user, only: %i[ show edit update destroy ]
+  before_action :find_user, only: [:show, :edit, :update, :destroy]
+  before_action do
+    raise AccessForbidden unless (current_user == @user) || current_user_at_least(:admin)
+  end
 
-  # GET /users
   def index
     @users = User.all
   end
@@ -47,7 +49,7 @@ class UsersController < ApplicationController
 
   private
     # Use callbacks to share common setup or constraints between actions.
-    def set_user
+    def find_user
       @user = User.find(params[:id])
     end
 

app/views/layouts/application.html.erb

@@ -34,7 +34,10 @@
     <div class="nav-menu">
       <% if user_signed_in? %>
         <div class="right">
-          <%= image_link_to t('.users'), "account-multiple-outline", users_path, current: :active %>
+          <% if current_user_at_least(:admin) %>
+            <%= image_link_to t('.users'), "account-multiple-outline", users_path,
+                  current: :active %>
+        <% end %>
         </div>
       <% end %>
     </div>

app/views/users/index.html.erb

@@ -1,3 +1,4 @@
+<% if current_user_at_least(:admin) %>
   <table class="items" id="users">
     <tr>
       <th><%= User.human_attribute_name(:email).capitalize %></th>
@@ -12,10 +13,11 @@
         <td><%= user.status %></td>
         <td><%= user.created_at.to_fs(:db_without_sec) %></td>
         <td class="svg">
-        <%= svg_tag "pictograms/checkbox-marked-outline.svg#icon" if user.confirmed_at.present? %>
+          <%= svg_tag "pictograms/checkbox-marked-outline" if user.confirmed_at.present? %>
         </td>
         <td class="actions"><%= image_link_to "Delete", "account-remove-outline", user_path(user),
                                   data: { turbo: true, turbo_method: :delete } %></td>
       </tr>
     <% end %>
   </table>
+<% end %>

config/application.rb.dist

@@ -31,6 +31,8 @@ module FixinMe
     # config.time_zone = "Central Time (US & Canada)"
     # config.eager_load_paths << Rails.root.join("extras")
 
+    config.action_dispatch.rescue_responses['ApplicationController::AccessForbidden'] = :forbidden
+
     # SETUP: Below settings need to be updated on a per-installation basis.
     #
     # URL to use in sent e-mails.