How to Use Built-In Phoenix Authentication

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Phoenix has a built in authentication generator.

To use the feature, you can run the following command:

mix phx.gen.auth Accounts User users

You are asked to choose the form of authentication that you want. The 2 choices are LiveView authentication or Controller based authentication.

LiveView Authentication

How to Restrict a Route to an Authenticated User

In the example below is a route named /sandbox.

Route

  scope "/", AppWeb do
    pipe_through [:browser, :require_authenticated_user]  #:require_authenticated_user
    live "/sandbox", SandboxLive
  end

Component

defmodule AppWeb.SandboxLive do
   use AppWeb, :live_view  

   on_mount {AppWeb.UserAuth, :ensure_authenticated}

   def mount(_params, _session, socket)  do
   {:ok, socket}  
   end

   def render(assigns) do
     ~H"""
        SANDBOX
        <div><% @current_user.id %></div>
   """ 
   end

end