Add User#disable_two_factor!

This method encapsulates all the logic for disabling 2FA on a specific
User model.

app/controllers/profiles/two_factor_auths_controller.rb

@@ -29,13 +29,7 @@ class Profiles::TwoFactorAuthsController < Profiles::ApplicationController
   end
 
   def destroy
-    current_user.update_attributes({
-      two_factor_enabled:        false,
-      encrypted_otp_secret:      nil,
-      encrypted_otp_secret_iv:   nil,
-      encrypted_otp_secret_salt: nil,
-      otp_backup_codes:          nil
-    })
+    current_user.disable_two_factor!
 
     redirect_to profile_account_path
   end

app/models/user.rb

@@ -322,6 +322,16 @@ class User < ActiveRecord::Base
     @reset_token
   end
 
+  def disable_two_factor!
+    update_attributes(
+      two_factor_enabled:        false,
+      encrypted_otp_secret:      nil,
+      encrypted_otp_secret_iv:   nil,
+      encrypted_otp_secret_salt: nil,
+      otp_backup_codes:          nil
+    )
+  end
+
   def namespace_uniq
     namespace_name = self.username
     existing_namespace = Namespace.by_path(namespace_name)

spec/controllers/profiles/two_factor_auths_controller_spec.rb

@@ -106,18 +106,11 @@ describe Profiles::TwoFactorAuthsController do
 
   describe 'DELETE destroy' do
     let(:user) { create(:user, :two_factor) }
-    let!(:codes) { user.generate_otp_backup_codes! }
 
-    it 'clears all 2FA-related fields' do
-      expect(user).to be_two_factor_enabled
-      expect(user.otp_backup_codes).not_to be_nil
-      expect(user.encrypted_otp_secret).not_to be_nil
+    it 'disables two factor' do
+      expect(user).to receive(:disable_two_factor!)
 
       delete :destroy
-
-      expect(user).not_to be_two_factor_enabled
-      expect(user.otp_backup_codes).to be_nil
-      expect(user.encrypted_otp_secret).to be_nil
     end
 
     it 'redirects to profile_account_path' do

spec/factories.rb

@@ -32,6 +32,7 @@ FactoryGirl.define do
       before(:create) do |user|
         user.two_factor_enabled = true
         user.otp_secret = User.generate_otp_secret(32)
+        user.generate_otp_backup_codes!
       end
     end
 

spec/models/user_spec.rb

@@ -217,6 +217,24 @@ describe User do
     end
   end
 
+  describe '#disable_two_factor!' do
+    it 'clears all 2FA-related fields' do
+      user = create(:user, :two_factor)
+
+      expect(user).to be_two_factor_enabled
+      expect(user.encrypted_otp_secret).not_to be_nil
+      expect(user.otp_backup_codes).not_to be_nil
+
+      user.disable_two_factor!
+
+      expect(user).not_to be_two_factor_enabled
+      expect(user.encrypted_otp_secret).to be_nil
+      expect(user.encrypted_otp_secret_iv).to be_nil
+      expect(user.encrypted_otp_secret_salt).to be_nil
+      expect(user.otp_backup_codes).to be_nil
+    end
+  end
+
   describe 'projects' do
     before do
       @user = create :user