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

Check for Authenticating of Individual Heex Modules

defmodule AppWeb.PageLive do
   use AppWeb, :live_view  
     on_mount {AppWeb.UserAuth, :mount_current_user }
   def mount(_params, _session, socket)  do
   {:ok, socket}  
   end
   
    def child_panel(assigns) do

    ~H"""
    <div>
       
          <%= if @auth_check do %>                        <!--This works-->
           <p> This is only viewed if authenticated</p>
         <% end %>

         <p> THis is viewed to all users</p>
    </div>
    """
  end


   def render(assigns) do
     ~H"""
     <div>
       <p> Hello World! Do you see the text below?</p>
         <%= if @current_user do %>  
           <p> This is only viewed if authenticated</p>
         <% end %>

         <.child_panel auth_check={@current_user}></.child_panel>  <!-- This works-->

     </div>
   """ 
   end

end