add notifications settings

app/controllers/email_smtp_settings_controller.rb

@@ -0,0 +1,36 @@
+# frozen_string_literal: true
+
+class EmailSmtpSettingsController < ApplicationController
+  before_action :load_encrypted_config
+  authorize_resource :encrypted_config, only: :index
+  authorize_resource :encrypted_config, parent: false, only: :create
+
+  def index; end
+
+  def create
+    if @encrypted_config.update(email_configs)
+      SettingsMailer.smtp_successful_setup(@encrypted_config.value['from_email']).deliver_now!
+
+      redirect_to settings_email_index_path, notice: 'Changes have been saved'
+    else
+      render :index, status: :unprocessable_entity
+    end
+  rescue StandardError => e
+    flash[:alert] = e.message
+
+    render :index, status: :unprocessable_entity
+  end
+
+  private
+
+  def load_encrypted_config
+    @encrypted_config =
+      EncryptedConfig.find_or_initialize_by(account: current_account, key: EncryptedConfig::EMAIL_SMTP_KEY)
+  end
+
+  def email_configs
+    params.require(:encrypted_config).permit(value: {}).tap do |e|
+      e[:value].compact_blank!
+    end
+  end
+end