Add single user mode

.env.production.sample

@@ -16,6 +16,12 @@ LOCAL_HTTPS=true
 PAPERCLIP_SECRET=
 SECRET_KEY_BASE=
 
+# Registrations
+# Single user mode will disable registrations and redirect frontpage to the first profile
+# SINGLE_USER_MODE=true
+# Prevent registrations with following e-mail domains
+# EMAIL_DOMAIN_BLACKLIST=example1.com|example2.de|etc
+
 # E-mail configuration
 SMTP_SERVER=smtp.mailgun.org
 SMTP_PORT=587
@@ -27,8 +33,11 @@ SMTP_FROM_ADDRESS=notifications@example.com
 # CDN_HOST=assets.example.com
 
 # S3 (optional)
-S3_ENABLED=false
-S3_BUCKET=
-AWS_ACCESS_KEY_ID=
-AWS_SECRET_ACCESS_KEY=
-S3_REGION=
+# S3_ENABLED=true
+# S3_BUCKET=
+# AWS_ACCESS_KEY_ID=
+# AWS_SECRET_ACCESS_KEY=
+# S3_REGION=
+
+# Optional alias for S3 if you want to use Cloudfront or Cloudflare in front
+# S3_CLOUDFRONT_HOST=

app/controllers/auth/registrations_controller.rb

@@ -3,6 +3,7 @@
 class Auth::RegistrationsController < Devise::RegistrationsController
   layout 'auth'
 
+  before_action :check_single_user_mode
   before_action :configure_sign_up_params, only: [:create]
 
   protected
@@ -21,4 +22,8 @@ class Auth::RegistrationsController < Devise::RegistrationsController
   def after_sign_up_path_for(_resource)
     new_user_session_path
   end
+
+  def check_single_user_mode
+    redirect_to root_path if Rails.configuration.x.single_user_mode
+  end
 end

app/controllers/home_controller.rb

@@ -5,15 +5,13 @@ class HomeController < ApplicationController
 
   def index
     @body_classes = 'app-body'
-    @home         = Feed.new(:home, current_user.account).get(20)
-    @mentions     = Feed.new(:mentions, current_user.account).get(20)
     @token        = find_or_create_access_token.token
   end
 
   private
 
   def authenticate_user!
-    redirect_to about_path unless user_signed_in?
+    redirect_to(Rails.configuration.x.single_user_mode ? account_path(Account.first) : about_path) unless user_signed_in?
   end
 
   def find_or_create_access_token

config/initializers/single_user_mode.rb

+# frozen_string_literal: true
+
+Rails.application.configure do
+  config.x.single_user_mode = ENV['SINGLE_USER_MODE'] == 'true'
+end