Instant 2FA for Devise

In a Rails environment, require the gem in your Gemfile:

gem 'devise_instant2fa'

Once that's done, run:

bundle install

Note that Ruby 2.1 or greater is required.

In order to use Instant 2FA, you'll need to configure your access_key and access_secret in the config/initializers/devise.rb file:

config.instant2fa_access_key = 'YOUR_ACCESS_KEY'
config.instant2fa_access_secret = 'YOUR_ACCESS_SECRET'

After you've updated your configuration settings, you'll need to add the :instant2fa_authenticatable strategy to your user (likely in your user.rb file):

devise :instant2fa_authenticatable, :database_authenticatable, :registerable, :recoverable, :rememberable,
       :trackable, :validatable

With those changes enabled, users who enable Instant 2FA will be prompted for verification on login.

Instant 2FA automatically provides a hosted user settings page. This library provies view helpers to embed that page in your user experience. To use the helpers, you'll need to include the DeviseInstant2fa::Views::Helpers module in your ApplicationHelpers (or in a more specific module):

module ApplicationHelper
  include DeviseInstant2fa::Views::Helpers
end

Once this is included, you'll have access to the instant2fa_settings_view(user) method, which you can use in any view:

<div class="two-factor-settings">
  <%= instant2fa_settings_view(resource) %>
</div>

The default view that shows the form can be overridden by adding a file named show.html.erb (or show.html.haml if you prefer HAML) inside app/views/devise/instant2fa/ and customizing it. The important element to display is the instant2fa_verification_form helper.

Below is an example using ERB:

<p><%= flash[:notice] %></p>

<%= instant2fa_verification_form(resource_name, @hosted_page_url)%>