We're going to make a Rails app that requires you to be logged in to see one of its pages.

Our app has three pages:

1. A login page, where the user enters their username. No passwords; we'll just trust them. After they're logged in, users are taken to...
2. A welcome page, which says, "Hi, #{username}", and has a link to the secret page, which is...
3. A page with a secret on it, which users must be logged in to see.

1. Build out the SessionsController with new, create, and destroy actions. You can use resources or write custom routes to handle these controller actions.
2. Write a current_user method in the ApplicationController.
3. Write a SecretsController with a show action. This controller should also use a before_action to prevent any route from being accessed without logging in. You can use resources or write a custom route to handle this controller action.

Use the specs as your guide, but we'd like the following behavior. We should be able to:

• If the user is not logged in, visiting the root of the app should redirect them to a login page.
  • The login page should be handled via the SessionsController#new action.
• If a user fails to enter their name on the login page, they should be redirected there until they successfully do so.
  • Submitting the login form should be handled via the SessionsController#create action.
• Once logged in, a user be able see the welcome page at the root route. This page should greet the user and link them to the secret page.
• The content and URL of the secret page are up to you. However, if we visit that URL without logging in, we should be redirected to the login page. Under no circumstances should we allow people who are not logged in to see the secrets.

Happy coding!