You can download the comprehensive Starter Example Here if you prefer.
This walkthrough will show you how to set up a basic Rails app using Sessions (for user management), omniauth-swoop (for authentication), and Swoop (for Magic).
Before you begin, make sure you head to the Swoop Dashboard and create a new property. You will need the
CLIENT_SECRET for this tutorial.
In the terminal type the following:
rails new swoop_rails
Once the basic project has been completed, let's add the resource that we want to protect by authentication. Create a controller called Secrets and allow rails to generate the
rails g controller Secrets index login
There are quite a few ways we can secure the routes. Since this example will use sessions to hold the user information, we can add all of our protection / user information to a concern. This will allow it to be used in any controller and to protect any resource.
Create a file in app/controllers/concerns called current_user_concern.rb and add the following code:
# Returns true if the user is logged in, false otherwise.
if session[:user] then
This exposes two methods. The first current_user checks to see if the :user key is part of the session and returns it. If not, nil is returned.
The second method require_login redirects to the login URL of our secrets controller if the current_user doesn't exist. We can use this as a filter on any of our controller actions.
Open up app/controllers/secrets_controller.rb and add the following code:
class SecretsController < ApplicationController
before_action :require_login, :except => :login
@user = current_user
We are including our CurrentUserConcern class here and using the require_login filter on all routes in the SecretsController except the login route.
Start up the server and test that our secret index route is protected.
Swoop for Rails is built on top of the popular Omniauth library. This allows you to easily configure it if you are already using this gem or easily add it if you are not.
Open your Gemfile and add the following line:
gem 'omniauth-swoop', '~> 0.1.7'
then open the console and type the following to install the gem:
Once installed, omniauth-swoop must be configured with the CLIENT_ID and CLIENT_SECRET obtained from step 1.
Create a file in config/initializers/ominauth.rb and add the following code replacing CLIENT_ID and CLIENT_SECRET with your property's credentials:
Rails.application.config.middleware.use OmniAuth::Builder do
provider :swoop, "CLIENT_ID", "CLIENT_SECRET"
# Allow GET requests
OmniAuth.config.allowed_request_methods = [:get, :post]
Note the line about allowed_request_methods. This is a recent change to Omniauth and will be required for this example to work.
Now that Swoop has been configured, we need a way to link the user to authenticate. Open app/views/secrets/login.html.erb and add the following code:
<h1>Welcome, please log in!</h1>
<div><%= link_to "Login", '/auth/swoop' %></div>
Let's test it out! Restart the server and visit http://localhost:3000/secrets/index. If you set everything up correctly, you should be automatically redirected to Swoop's authentication screen.
If you follow the login flow, it will eventually redirect you to http://localhost:3000/auth/swoop/callback and throw an error. That's because this route doesn't exist yet. Let's create it.
When Swoop returns, it will redirect to /auth/swoop/callback. At this point, the user is fully authenticated. Before we create this logic, let's wire up this route to a controller that we'll create in the next step. Open config/routes.rb and add the following lines:
get '/auth/:provider/callback', to: 'sessions#create'
get 'logout', to: 'sessions#destroy', as: :logout
This will link the callback up to a create method of a Sessions controller. I have also added the logout route to link up to the destroy method. Both of these methods will be implemented in to the following section.
Open the terminal and create a Sessions controller. We will add two routes, create and destroy, for our callback and our logout functions.
rails g controller Sessions create destroy
Open the newly created app/controllers/sessions_controller.rb and add the following code
class SessionsController < ApplicationController
@user = request.env['omniauth.auth'].info
session[:user] = @user
When Omniauth completes the authentication, all of the user information is stored in a global environment variable called
request.env['omniauth.auth'].info. For this example, we can store this info directly in the user session. In a production app, you might use this information to look up a user in your database.
To log out, we simply destroy the session and redirect the user to the logout page.
What good would a secret route be without showing some user information? Open up app/views/secrets/index.html.erb and add the following code:
<p><%= @user["email"] %></p>
<%= link_to('Logout', logout_path) %>
Here we are displaying the user's email address and giving them a link to log out. Now, start up the server, head back to http://localhost:3000/secrets/index and walk through the authentication steps.
You should now see a screen similar to the one below:
You should now have a basic application that authenticates password-free with Swoop.
Updated over 2 years ago