Add ability to block sign-ups from IP (#19037)

app/services/app_sign_up_service.rb

@@ -2,23 +2,67 @@
 
 class AppSignUpService < BaseService
   def call(app, remote_ip, params)
-    return unless allowed_registrations?
+    @app       = app
+    @remote_ip = remote_ip
+    @params    = params
 
-    user_params           = params.slice(:email, :password, :agreement, :locale)
-    account_params        = params.slice(:username)
-    invite_request_params = { text: params[:reason] }
-    user                  = User.create!(user_params.merge(created_by_application: app, sign_up_ip: remote_ip, password_confirmation: user_params[:password], account_attributes: account_params, invite_request_attributes: invite_request_params))
+    raise Mastodon::NotPermittedError unless allowed_registrations?
 
-    Doorkeeper::AccessToken.create!(application: app,
-                                    resource_owner_id: user.id,
-                                    scopes: app.scopes,
-                                    expires_in: Doorkeeper.configuration.access_token_expires_in,
-                                    use_refresh_token: Doorkeeper.configuration.refresh_token_enabled?)
+    ApplicationRecord.transaction do
+      create_user!
+      create_access_token!
+    end
+
+    @access_token
   end
 
   private
 
+  def create_user!
+    @user = User.create!(
+      user_params.merge(created_by_application: @app, sign_up_ip: @remote_ip, password_confirmation: user_params[:password], account_attributes: account_params, invite_request_attributes: invite_request_params)
+    )
+  end
+
+  def create_access_token!
+    @access_token = Doorkeeper::AccessToken.create!(
+      application: @app,
+      resource_owner_id: @user.id,
+      scopes: @app.scopes,
+      expires_in: Doorkeeper.configuration.access_token_expires_in,
+      use_refresh_token: Doorkeeper.configuration.refresh_token_enabled?
+    )
+  end
+
+  def user_params
+    @params.slice(:email, :password, :agreement, :locale)
+  end
+
+  def account_params
+    @params.slice(:username)
+  end
+
+  def invite_request_params
+    { text: @params[:reason] }
+  end
+
   def allowed_registrations?
-    Setting.registrations_mode != 'none' && !Rails.configuration.x.single_user_mode
+    registrations_open? && !single_user_mode? && !omniauth_only? && !ip_blocked?
+  end
+
+  def registrations_open?
+    Setting.registrations_mode != 'none'
+  end
+
+  def single_user_mode?
+    Rails.configuration.x.single_user_mode
+  end
+
+  def omniauth_only?
+    ENV['OMNIAUTH_ONLY'] == 'true'
+  end
+
+  def ip_blocked?
+    IpBlock.where(severity: :sign_up_block).where('ip >>= ?', @remote_ip.to_s).exists?
   end
 end