Adding the user to the session

lib/phoenix_api_template_web/auth/set_user.ex

@@ -0,0 +1,27 @@
+defmodule PhoenixApiTemplateWeb.Auth.SetUser do
+  import Plug.Conn
+  alias PhoenixApiTemplateWeb.Auth.ErrorResponse
+  alias PhoenixApiTemplate.Accounts
+
+  def init(_options) do
+  end
+
+  def call(conn, _options) do
+    if conn.assigns[:user] do
+      conn
+    else
+      user_id = get_session(conn, :user_id)
+
+      if user_id == nil do
+        raise ErrorResponse.Unauthorized
+      end
+
+      user = Accounts.get_user!(user_id)
+
+      cond do
+        user_id && user -> assign(conn, :user, user)
+        true -> assign(conn, :user, nil)
+      end
+    end
+  end
+end